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Aini Lostari
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.317

Abstract:
A system can be subjected to excessive vibration if the force acting on it approaches the natural frequency of the system. The way to do it, especially for single operating frequency, is adding the dynamic vibration absorber. Generally, the dynamic vibration absorber is a mass-spring-damper addition to the main system. This study researches the effects comparison of Without Dynamic Vibration Absorber and Series Double Dynamic Vibration Absorber on the main system response. Electric motor with unbalanced masses is used as the exciter and placed on the two beams. The main mass is supported by these beams. This system has the specified dynamic equations. The main system response absorber TDVA addition gives 0.008291meter displacement rms at 1, 002 frequency-ratio. The one with DDVA system response absorber with Ma1=1/20 and Ma2 =1/20, Ma1=2/30 and Ma2 =1/30, and Ma1=1/40 and Ma2 =1/40 gives 0.001484 meter, 0.002691 meter, and 0.001343 meter. The system with SDVA gives better response than DDVA. The first absorber mass ability to reduce main mass response is disturbed by the second absorber mass existence.
Ahmad Imam Khoiruddin
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 1-15; https://doi.org/10.33021/jmem.v7i1.3390

Abstract:
An analysis of the relationship between locomotive speed and wind direction was carried out on the amount of drag force faced by the CC203 locomotive, one of the fastest locomotives used in Indonesia today. Based on the results of the analysis, an alternative geometry option was made for the CC203 locomotive’s nose. In the geometry option, changes are made to the front structure of the locomotive in order to reduce the amount of air drag that occurs. Based on the results of the analysis that has been carried out, the greater the speed of the locomotive, the value of the drag coefficient will tends to be constant, but the overall value of the drag force will increase. In addition, changes in wind direction facing the locomotive will also significantly increase the coefficient and air drag force. In changing the locomotive geometry, the results of geometric options are obtained that can significantly reduce the coefficient and total air resistance force. Locomotive velocity was assumed as resultant of wind velocity.
Fabiola Khasana, Bambang E. Yuwono, Dewi Rintawati
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.323

Abstract:
Customer satisfaction is a customer perception that expectations have been fulfilled by material and material suppliers. Customer satisfaction can be achieved if a construction product or service meets customer expectations. So almost every material and material suppliers now realize the importance of customer meaning for the company and strive to provide satisfaction to customers. The existing problem is what sub criteria can be used to measure supplier quality, customer satisfaction, and how the relationship between supplier quality and customer satisfaction. The purpose of this research is to know the sub criterion of supplier quality, customer satisfaction, and analyze the variable of supplier quality which is most dominant to customer satisfaction. Analyzed using Structural Equation Modeling (SEM) method. The results of this method are: the most dominant sub-quality suppliers criteria, namely Overcoming difficulties immediately and accurately, Providing good service from start to finish, Fast and timely service process, Physical quality of reinforcing steel meets Indonesian Industrial Standard and SNI, Price which is given is the price in accordance with the quality, Provides ease in contacting the company, and good employee competence. The most dominant customer sub-criterion is Overall supplier satisfies customer, Customer says positive, Customer recommends to others, Customer buys reinforcing steel in the same place, Customer seldom makes the switch, Makes the supplier the first choice for customer, Makes supplier as the best company in Indonesia, Meet customer expectation, Customers happy stock of goods from supplier, and promising product quality, Criteria of supplier quality relationship with the most dominant customer satisfaction, that is Empathy, Loyalty, Satisfaction, Responsiveness, Assurance From Supplier
Yosep Purnama, Wahyudi Wahyudi, Agus Subandi Harto
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.319

Abstract:
In designing and producing a salt spray chamber test apparatus for the required parameters to be standardized for the test method, the tool is designed and manufactured according to ASTM B117-09 standards, in addition to the standards mentioned, the design of this corrosion test apparatus also refers by studying ISO standards and JIS in the manufacture of such tools. By making this tool is expected to be able to test a specimen of a steel material. In addition to testing, heat transfer calculations and analysis in the chamber area are needed to determine the heat lost and the required power heater. From the result of spray salt collecting test obtained 1.5 ml salt solution in collecting cup with wide of  within 1 hour done in two positions, so for equalization of salt fog is in accordance with standard ASTM B117 collecting salt spray 1-2 ml / hr. The next parameter is that the temperature of the chamber must be maintained at 35°±2℃ from the temperature test results in accordance with ASTM B117 standard. From the test result of plate material JIS G 3141 SPCC (Steel Plate Cold Rolled Coiled) dimension 76 x 127 x 0.7 mm for 48 hours with test method. Neutral salt spray result from corrosion rate calculation got corrosion rate equal to 27.4665 mpy.
Agus Aryanto, Sugiatmo Kasmungin, Fathaddin Fathaddin
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.322

Abstract:
.Hydraulic fracturing is one of the stimulation method that aimed to increase productivity of well by creating a high conductive conduit in reservoir connecting it to the wellbore. This high conductivity zone is created by injecting fluid into matrix formation with enough rate and pressure. After crack initiate and propagate, the process continue with pumping slurry consist of fracturing fluid and sand. This slurry continues to extend the fracture and concurrently carries sand deeply into formation. After the materials pumped, carrier fluid will leak off to the formation and leave the sand holds the fracture created. TLS Formation in X and Y Field is widely known as a formation that have low productivity since it has low permeability around 5 md and low resistivity 3 Ohm-m. Oil from TLS formation could not be produced without fracturing. This formation also have high clay content, 20 – 40 % clay. Mineralogy analysis also shown that this formation contains water sensitive clay such as smectite and kaolinite. Hydraulic fracturing has been done in this field since 2002 on around 130 wells. At the beginning of hydraulic fracturing campaign, the success parameter is only to make the wells produce hydrocarbon in economical rate. As the fractured wells become larger in number, several optimization is also been done to increase oil gain. Later on, the needs of conclusive analysis to evaluate well performance after hydraulic fracturing rise up due to sharp decrement of crude oil price. Accurate analysis and recommendation need to be conducted to assess the best candidate for hydraulic fracturing to maximize success ratio. Even though a common practice, candidate-well selection is not a straightforward process and up to now, there has not been a well-defined approach to address this process. Conventional methods are not easy to use for nonlinear process, such as candidate-well selection that goes through a group of parameters having different attributes and features such as geological aspect, reservoir and fluid characteristics, production details, etc. and that’s because it is difficult to describe properly all their nonlinearities. In that matter, Artificial Intelligence approach is expected to be an alternative solution for this condition.
Andi Priyanto, Dody Prayitno
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.325

Abstract:
Steel is often used as crucial in the world of metal casting. This study aims to determine the effect of aluminum alloy fluid on the hardness of the crucible steel interface. The method begins with melting aluminum, copper, and tin according to each variant with a temperature of 700oC, then stirring on the liquid for 15 minutes and holding it for 30 minutes. From this research it is concluded that the addition of Cu (10% and 20%) in Al-Sn-Cu fluid causes hardness value at the interface layer area but the increase is not very significant.
Rudi Hariyanto, Achmad Basuki, Rini Nur Hasanah
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.95

Abstract:
Cataract is one type of eye damage which causes the lens of the eye, nearsightedness which varies according to the level becomes blindness. Cataract eye disease is eating slowly, little by little without the pain experienced by patients but if handled too late then lead to permanent blindness. Eyepiece contains 65% water, 35% protein and the rest are minerals. With increasing age, size and mineral density increases. The accuracy of the determination of the type and location of early cataract is very important to prevent the severity of the impact of more severe cataracts. The main procedure of cataract diagnosis (Gold Standard procedure) was performed using computed tomography (CT) scan and Magnetic Resonance Imaging (MRI). Alternative diagnosis can be made through physical examination, laboratory tests, medical history, and other relevant information. The purpose of this paper presents the results of a study on the implementation of the method of Learning Vector Quantization (LVQ) to facilitate the determination of the classification of types of cataract disease and its severity. The results showed that the use LVQ provide the level of accuracy of the determination of the amount of (99%) as well as the duration of training (training) sample of (0.06 seconds).
, Budi Sutrisno
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 26-34; https://doi.org/10.33021/jmem.v7i1.3608

Abstract:
The die design process for casting requires repeated testing in order to get a good die and produce a product that is as planned, which takes a long time and costs a lot for die making in this trial. The purpose of this study is to determine a more efficient process in die design by conducting a casting analysis using a MagmaSoft simulation. The sample part used in this study is a motorcycle brake master cylinder which will be made by the Gravity Casting process with aluminum material. The basic method used is die design using CAD by calculating Shrinkage allowance, and casting simulation using MagmaSoft software to find out various possible defects during the casting process, such as filling, air trap, solidification, hot spots, and shrinkage porosity. The simulation results show that in the filling process there is no indication of cold shot and no air trap problem, solidification and hot spots are good and occur in the part area, and there is little porosity. In general, the simulation results show that the die design has met the requirements, although there is porosity, this porosity occurs in the area that will be lost after the machining process
Diki Okiandri, Erni Yudaningtyas
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.99

Abstract:
Increased use of computers in education campus resulted in dense data traffic on communications networks. At the Islamic University of Malang (Unisma) there are more than 500 computers connected to the Internet using a wired media and hotspot access. Unisma existing network infrastructure in current use the Multimode Fiber Optic Backbone cable with static routing and Mesh topology. These lots number of users on the network resulting in dense data traffic that lead to long delays or long queues. Genetic algorithm is a search algorithm that is based on the natural genetic mechanism which also being used in optimizing network performance. This study compared the performance of existing network and a simulation of optimization using Genetic Algorithms. Measurement and retrieval of data consist of transfer time, also we built software engineering using visual studio program as a comparison model.The result of this study shows that optimization using genetic algorithm is able to find the fastest path and increase the speed of transmission of data packets by reducing transfer time by 53.5% and increase the datarate of 54.75% compared to the queuing method used on the existing network.
Anugrah Rachmarifqi, Sugiatmo Kasmungin, Bambang Kustono
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.326

Abstract:
Wells X has decreased the pressure inside the well. The thing that needs to be done on the well to determine the cause of the pressure drop is by doing Pressure, Temperature, Spinner Survey (PTS Survey) test when the well is flowing (PTS flowing) and when the well is closed (PTS shut-in). PTS flowing is done with the aim of determining the depth and contribution of feedzone, as well as determining the potential of generating electricity wells. PTS shut-in is done to determine the outflow phenomenon and determine the conditions in the wellbore. Data obtained by PTS survey are pressure, temperature, spinner speed, and cable speed. Data acquired by the PTS tool during PTS flowing and then processed, obtained that well X has three feedzone zones, ie feedzone 1 at 1084-1164 mKU depth, feedzone 2 at depth 1168-1392 mKU, and feedzone 3 at 1532 depth -1564 mKU. The contribution given by each feedzone was 6.2 kg / s at feedzone 1, 2 kg / s at feedzone 2, and 1.9 kg / s in feedzone 3. With a total mass of 10.1 kg / s of steam and power plant of 8 ton / hr / mw, well X has an energy potential of 4.55 MWe.Keywords: Pressure Temperature Spinner, Feedzone Contribution, Superheat, Condition of Wells, Reservoir Conditions
Achmad Purnomo Wijaya, Niam Tamami, Hary Oktavianto
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 35-50; https://doi.org/10.33021/jmem.v7i1.1477

Abstract:
3D scanner that uses image sensors requires the role of a computer that includes a data generator, data acquisition, and visual display. In a simply system, it can be designed the sensory system uses non-imagery sensor so the role of the data generator can be handled by the microcontroller. This research aims to make a simple 3D scanner using inexpensive non-imagery Time of Flight VL53L0X sensor and data processing can be processed directly by the microcontroller. The results of sensor distance measurements are processed on the microcontroller and desktop application. The distance and angle values are converted into Cartesian coordinate using cylindrical coordinate system. The scan results of the cubes, prisms and cylinder are similar with the reference object, but the results of the pyramid test at the top cannot be scanned properly due to the narrow surface. The laser beam from the emitter cannot bounce back to the collector properly makes distance reading is inaccurate and causes error in the point cloud conversion. The comparison error between the side of the scan results and the reference object is between 2.54-39.8%. The surface of objects with bright color has a smaller error than those with dark color. The comparison error of the height of the scan results with the reference object is between 5-32%. The angle of the emitter exclusion cone and the collector exclusion cone sensor affects the error at the side and height of the scan results.
Haris Cahyo Triatmono, Muslimin Muslimin, Lydia Anggraini
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.320

Abstract:
Creating a magnet with powder metallurgy technology, the materials to be processed must be available in powder form with a relatively very fine size, in micrometers (μm). In the magnetism of materials, grinding the material to obtain a very fine powder size is intended to obtain a magnetic material powder having a single domain. One tool commonly used to reduce the size of the powder to reach the size of a micrometer (μm) is a ball milling machine. This tool works by using hard balls in a drum. The balls are clashing each other with ground powder until the powder size becomes very small. Ball milling is using a strong material SS400, so it is expected to last long. While the special drum uses a base material of metal that is non-magnetic based Austenitic Manganese Steel. Ball uses a Ni-Hard ball. The AC motor measured with a stroboscope while carrying the load is 744 rpm. The process of smoothing that occurs inside the tube when the machine is run is the occurrence of collisions between Ni-Hard balls with the best grind sand is 83.3 grams with the number of Ni-Hard ball 101 fruit with a diameter of 10 mm and 75 pieces with a diameter of 11 mm, with using a 1:5 ratio. The process of shooting using Keyence optical microscope VHX 5000 with 200x bundle. Significant size changes occur with grinding with 10 mm diameter Ni-Hard ball from 15 minutes to 45 minutes. Then by using a Ni-Hard ball diameter of 11 mm also changed although not too significant.
Avty Vilanti, Sugianto Kasmungin, Dwi Atty Mardiana
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.321

Abstract:
Polymer injection is one of the methods of increasing oil recovery or Enhanced Oil Recovery (EOR) after the water injection method is performed, to reduce residual oil saturation. The polymer reduces the water mobility ratio so that the sweeping efficiency will increase to encourage bypassed and unswept residual oil saturation. For polymer injection applications, partially hydrolyzed polyacrylamide (PHPA) or commercially known as HPAM is the most widely used type. At the current low oil prices, design optimization of polymer injections in certain reservoirs is important. The purpose of this research is to analyze the effect of permeability and polymer concentration on residual oil saturation by core flooding method in the effort of optimization of polymer injection. The optimal concentration in this study is 1,500 ppm which has the lowest residual oil saturation value. The increase in concentration from 500 ppm to 1.500 ppm, residual oil saturation decreased in four variations of Berea sandstone permeabilities. However, when the polymer concentration is added to 2.500 ppm, the residual oil saturation value increases. This can be caused by pore clogging. Whereas with permeability, residual oil saturation is directly proportional. The greater the permeability the greater the value of residual oil saturation. Core Y7 Berea has the highest permeability and saturation of residual oil. The results of this study are expected to be useful in the development of polymer injections on EOR activity.Keywords.polymer injection, concentration, permeability, PHPA, residual oil saturation
Kokok Tri Budianto, Anggun Rizka Maudina, Askar Triwiyanto
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.316

Abstract:
The impact test is a test to measure the material's durabilityagainst shock loads. The impact test simulates the operating conditions of that materialoften found where the load does not always occur slowly but rathercame suddenly. The impact test instrument to be designed in this studyis a Drop Weight Tester (DWT) tool. This impact test apparatus utilizes massobjects and gravitational forces. Design of Drop Weight Tester (DWT) tool, designthe design refers to the ASTM D-5420-04 standard. In this study the designthe impact test apparatus analyzed the strength of the connection as well as the construction deflection forensure design results can be made. On testing Drop Weight Tester, objectsthe test is given a shock load with certain criteria such as altitude, load, dimensionpunch component striker as well as specimen thickness. At the same time it is doneobservation and data collection of the energy absorbed during the test.Specimen used is SPCC and Zincalume material with thicknessdifferent.
Adven Charlos M Pappin, Trijana Kartoatmodjo, Pauhesti Rusdi
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.324

Abstract:
The CP-52 and CP-54 wells are located on the Tambun structure of Bekasi Regency of West Java Province with the target formation being Baturaja. The pressure build up analysis is carried out for monitoring activities to obtain reservoir and boundary, innitial pressure (Pi), permeability (k), skin (s), ΔP skin, average pressure (Pavg), and flow efficiency information. Tests performed on both wells are pressure build up test (PBU) and to analyze the method of Horner approach pseudo pressure and P2 either manually or with the help of software v.ex.2 v2.02 as validation.
Tri Yoga Prasojo, Sugiatmo Kasmungin
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i01.318

Abstract:
There are three levels in producing oil or natural gas: primary recovery where oil flows into the wellbore by itself; secondary recovery where oil flows with the help of water or gas injection; and tertiary recovery, commonly called Enhance Oil Recovery (EOR). Total recovery from one oil field is about 50% -60% of OOIP. With primary and secondary recovery 30% -40% can be obtained from OOIP, it is expected that the remaining 20% -30% can be taken with EOR. This study investigated EOR by injection of various surfactant concentrations at temperatures of 30°C and 80°C using brine with salinity of 10,000 ppm by imbibition. The aim of this research is to know the effect of surfactant concentration and salinity of the formation water on oil acquisition in relation to sandstone permeability, and to find out what level of concentration to the average permeability rate with temperature close to reservoir average temperature (80°C), can be obtained a minimal Sor so that RF (Recovery Factor) to be maximal. The methodology used is to measure: the physical properties of rocks and fluids (the solution used), the interface voltage and selected the best solution (the smallest interface voltage), and soaking the rock with Amot test glass. From this study, it can be concluded that the addition of concentration will decrease the density, but the addition of temperature will decrease the density and viscosity; the addition of the surfactant and temperature concentration will decrease the interface voltage until the CMC point is reached; good permeability and porosity may not produce good results when clay contamination is present
Mohamad Ansori
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.87

Abstract:
Range resolution as one of the parameters of the radar system becomes very important and need to be upgraded to provide accurate target distance information. Increased bandwidth can be done however is limited to devices for Direct Digital Synthesizer (DDS) that are used and will enlarge the noise and power consumption of system Frequency Modulated Continuous Wave (FMCW) radar. To improve range resolution, output signal and bandwidth linieritas chirp both plays is very important and the sampling rate of the engineering efforts for improved range resolution still experience barriers when based on peak detection. So to improve range resolution alternatives that can do that is maintain linieritas or increase bandwidth and not just based on peak detection. In this paper are discussed improved range resolution without increasing bandwidth using curve fitting method by way of comparing the output signal of the mixer and beat frequency shift signal mixer output to both match (match). Error of measurement range resolution is affected by the phase errors due to the lack of frequency of linieran beat, so that needs to be done shifted frequency curve fitting method using beat against the sweep of raw data (output ADC) to earn optimum beat frequency (optimum resolution range). Range resolution for Radar Demonstration Kit (RDK) using curve fittng methods obtained results an increase of 30% and the shifting of the beat frequency of 3KHz.
Andy Haryoko, Sholeh Hadi Pramono
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.96

Abstract:
Transportation is important needs in daily life. However, there are so many problems in transportation system in our country. The one is public transportation. To overcome it, the government implement KIR. But this KIR has several weakness. One of them is manual data. As cosequnces, human error in listing can came out as the process goes on. Pattern recognition can be used to implement automatic number plate identification in this system. One of the method is canny filter. Canny filter is uses to obtain a good image in the character image acquisition. Characters based with 12X7 pixels are be converted into binary as input for Multi Layer Perceptron with 3 layers node number of each node 84, 50, 36. Artificial neural network is trained with back propagation algorithm with a learning rate parameter 0.3 and momentum 0.9. The training process will be terminated when the iteration reaches a maximum value of 10,000 or MSE (Mean Square Error) 0.0001. Recognition rate for numeral character is 100%, however recognition rate for letter character is little bit worser, 86,87%. So overall performance is 94,29% for the whole characters.
Firdaus Ms, Wahyu Wiranata, Sugeng Prasetyo
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 16-25; https://doi.org/10.33021/jmem.v7i1.3504

Abstract:
This study aims to determine the effect of variations in quenching media with NaCl on the value of hardness, energy value of the impact and the microstructure phase formed from the carburizing pack. The results showed that the highest hardness value was obtained by quenching 25% NaCl with a value of 136.76 N/mm2 and the lowest value was obtained in specimens without raw material treatment with a value of 119.63 N/mm2, it can be concluded that the higher the concentration of salt, the higher the hardness value. The results of the impack test showed the highest value in the Raw Material specimen with a value of 14,234 Joules and the lowest value on the specimen with 25% NaCl quenching with a value of 5,694 Joules, it can be concluded that the untreated specimen has a good ductility value, while for the specimens undergoing the quenching process, experience agitation. Metallographic test results show the phase of martensive formation in the quenching process and ferlite in Raw Material
Tetuko Kurniawan, Yosep Purnama
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.97

Abstract:
In a mold manufacturing process, few to hundreds electrode is required for the EDM process. The electrode production is time consuming and it prone to errors when it comes to creating Electrode Block Order Sheet. New software was developed to create automated process to generated Electrode Block Order Sheet that reduce the time consumption and eliminate human errors during the process. By the application of the software, time consumption to create Electrode Block Order Sheet is reduced by 80% and human error involved in the process is eliminated.Keywords. EDM, mold, software, automation, electrode, manufacture
Rama Adistya, M. Aziz Muslim
Journal of Mechanical Engineering and Mechatronics, Volume 1; https://doi.org/10.33021/jmem.v1i02.86

Abstract:
Vehicle object recognition is a very interesting and everlasting research topic. The use of appropriate algorithms have a significant impact in the process of recognition and calculation. Proposed approach is designed and implemented using java. This system contain an application which can classify vehicles to recognize passing the toll road Surabaya-Malang km 34 using Backpropagation for learning and Sobel in Introduction to objects. In the process of image processing, the binary data of 10x10 pixels is used as input values for the neural network with 3 layers,and or leraning rate 0.3. Training process stops with a maximum value of 10,000 MSE (Mean Square Error) 0.0001. Success rate on the morning, noon, night test where 94.63%, 93.85% and 68.32%.
Asep Suhandi, Lydia Anggraini
Journal of Mechanical Engineering and Mechatronics, Volume 2; https://doi.org/10.33021/jmem.v2i02.327

Abstract:
Mechanical Alloying (MA) / Mechanical Milling (MM) is a process of processing of solid metal powders including the union and re-destruction of powder particles by using high-energy ball mill. The difference depends on whether material transfer is involved or not during processing. The study was conducted by analyzing the effect of the mechanical milling process by comparing the microstructure and mechanical properties of the copper-iron between the ones before milling (sample 1) and after milling for 2 hours (sample 2). The sample was made into a green compact cold pressing process with an emphasis system using mechanical mechanisms and dual emphasis techniques. Sintering process using continuous type machine with conveyor belt mesh and furnace type is muffle. After that cooled with natural water jacket process. Vicker hardness testing and strength testing (tensile strength test) is performed to determine the mechanical properties of copper-iron alloys that occur. The mean value of sample 1 hardness (before milling) was 39.8 HV. The mean value of sample hardness 2 (after milling) was 74.9 HV. The value of the yield strength (σ) of sample 1 is 17.597MPa, and the value of ductility (ε) is 0.119. The value of the yield strength (σ) of sample 2 is 18.547MPa, and the value of ductility (ε) is 0.073. The observation of micro structure was done to know the physiological surface of the alloy formed and to know the distribution of the composition. Observation of sample microstructure 1 shows solid phase formation ε (silver color) is an area of iron element formed with large size. Solid phase γ (orange color) is an area of copper element formed with large size. The visible elements are copper (Cu) and iron (Fe) which have a large percentage formed with large size (> 50 μm), and the pore is also large (> 50 μm). For carbon element (C), it looks gray, with a small amount. For other elements, such as zinc (Zn), phosphorus (P), and Tin (Sn), generally, they are at the grain boundary of iron (Fe) and copper (Cu) elements. Observation of sample microstructure 2 shows solid phase formation ε (silver color) showing iron area area formed with smaller size. The solid phase γ (white color) shows the copper element area formed with a smaller size. The elements seen are copper (Cu) and iron (Fe) with a small size (<50 μm), and small pores occur. From the test results and analysis showed that by shrinking the size of metal powder by milling for 2 hours can increase the hardness and yield strength of the product. Although the product becomes more brittle which is indicated by the decreased ductility value.
Doddi Yuniardi
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 63-76; https://doi.org/10.33021/jmem.v7i1.3380

Abstract:
Sampah perkotaan ini merupakan suatu bahan yang terbuang atau dibuang sebagai hasil aktivitas manusia maupun proses alam yang belum memiliki nilai ekonomis. Pengelolaan sampah yang diselenggarakan oleh dinas terkait saat ini hanya fokus pada pengumpulan dan pengangkutan ke Tempat Pembuangan Akhir (TPA) tanpa melalui pengolahan tertentu. Akibatnya sampah hanya menumpuk di sudut-sudut kota sampah yang menumpuk saja dapat membawa dampak yang buruk pada kondisi kesehatan manusia dan lingkungan. Bila sampah dibuang secara sembarangan atau ditumpuk tanpa ada pengelolaan yang baik, akan menimbulkan berbagai dampak yang lebih serius. Terjadinya bencana (ledakan gas metan, tanah longsor, pencemaran udara akibat pembakaran terbuka dan lain-lain) merupakan akibat dari pengelolaan sampah yang belum dilaksanakan dengan baik. Oleh karena itu perlu adanya sistem penangkapan metana dan pengubahan biogas menjadi energi menawarkan salah satu alternatif bagi pengelolaan sampah terpadu untuk mengurangi dampak lingkungan sekaligus menghasilkan energi terbarukan. Studi ini diperlukan untuk dapat mengimplementasikan potensi yang ada tersebut sehingga akan berdampak positif bagi perekonomian dan lingkungan di wilayah yang distudi. Dalam hal ini penelitian dilakukan untuk TPA Burangkeng, Kabupaten Bekasi. Jawa Barat.
Fitroh Anugrah Kusuma Yudha
Journal of Mechanical Engineering and Mechatronics, Volume 7, pp 51-62; https://doi.org/10.33021/jmem.v7i1.3377

Abstract:
Saat ini dalam proses pembelajaran berkembang pesat, dan berbagai media pembelajaran digunakan sebagai model aplikasi, menurut siswa untuk menerima kemajuan pembelajaran modern. Dalam penelitian ini, penulis akan merancang secara komprehensif PLC semi box sederhana, antara lain komponen PLC Outseal 16 I/O, box PLC, papan peraga, dan USB. alat peraga PLC yang dibuat ini merupakan media yang mudah dipelajari karena dapat diuji langsung atau digunakan sesuai program sesuai spesifikasi perangkat. Trainer PLC ini menggunakan PLC Outseal 16 I/O, alat Peraga PLC Outseal dibuat dengan sirkuit. Pengguna dapat dengan mudah menggunakan Trainer PLC Outseal, dan dapat menyelesaikan model masalah yang sederhana dan model pribadi yang sangat kompleks sesuai dengan kebutuhan yang ada industri.
Muhammad Ramadhan
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 95-105; https://doi.org/10.33021/jmem.v6i2.1686

Abstract:
The need for sliced scallions is relatively large, so a tool that can assist in the slicing process is more effective both in terms of energy and time spent. Based on these problems, the idea was born to design a scallion slicing machine to help the community in slicing scallions, especially food sellers who need scallions such as egg martabak sellers, and food sellers.The method used is literature study (library), field observations, and problem-solving methods in the form of design which includes pre-planning in the form of machine sketches, machine concept planning, calculations, making working drawings, procurement of materials and components, toolmaking, assembly, and testing.The output of this final project is the manufacture of a scallion slicing machine that is simple and effective by not forgetting the safety and hygiene factors so that it can support the slicing process at the scale of traders and home industries. This tool has a capacity of 300 grams per minute using a DC 775 motor and is sourced from four 18650 li-ion batteries.
, Muhammad Munajad
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 122-131; https://doi.org/10.33021/jmem.v5i2.1250

Abstract:
One of very important and vital tool in road marking is road mark erasing machines. In general, the machine used to repair road markings is a road marking erasing machine that is pushed manually. However, this machine has a disadvantage that requires a long time in the process of erasing the road marking, so making it less efficient. Therefore, the truck road mark erasing machine is one of the options to replace the erasing machine that is pushed manually. The machine uses a grinding system with a vertical blade eraser position and hydraulic power to drive the blades as it is able to withstand shock loads and thrust upwards due to the removal process, having overload protection, and the size of components are not large. The study started with doing observation to the existing manual erasing machine, then determining the required blades and calculating as well as selecting the required components of the hydraulic system. Based on the calculation, the blade specification was obtained and selected, i.e surface milling cutter of type WFX12200R from Sumitomo Electric Hardmetal Corporation having rotation speed 750 rpm, hydraulic motor from Danfoss of type OMR-80 having torque 136 Nm dan displacement 80.3 cc/rev., and using hydraulic pump from Parker of type 0210 having displacement 21 cc/rev. From the test result in the field, this machine is three times faster than the manually pushed machine, less number of the blade used, and the engine as a resource on the machine is more durable.
Muhammad Dzulkifly, Raffy Frandito, Mochammad Rafli Ramadhani, Wildan Rahmawan, Farid Triawan
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 75-87; https://doi.org/10.33021/jmem.v6i2.1508

Abstract:
Almost every year, floods disaster becomes the scourge of many countries in the world, including Indonesia. When the flood comes and submerges the houses, every item and household furniture in it will also be submerged in flood water. Furniture that is heavy and difficult to move, especially electronic equipment such as refrigerators, may be left by the owner when a flood occurs. To prevent the furniture from submerging, a lifting kit is needed. For this reason, the purpose of this work is to design a mechanical tool/kit that can lift or elevate the electronic furniture such as refrigerator to a higher position and avoid the damage caused by flood. The kit is expected to be able to cover a 100 x 80 cm base of the refrigerator with maximum load of 200 kg. The elevation of the lifting kit is set to be higher than 50 cm. Calculation for the stress and fatigue analysis is also performed to determine the strength of the structure. As a result, the obtained safety factors for the critical components under static and fatigue loading conditions show values of more than one, indicating the product is safe for real operation. In addition, the required torque to produce the elevation is also calculated and discussed.
Zairullah Azhar, Azhari Sastranegara
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 38-47; https://doi.org/10.33021/jmem.v5i1.943

Abstract:
This paper presents the analysis of mini excavator excava 50 with a focus on the boom component. The boom component is a component that has a heavy workload. The material used in the existing design is SM490A. The results of the analysis are still not safe because allowable stress is less than working stress. The material in the existing design was replaced with Hardox 400. The design is declared safe. However, the costs of the product have increased because Hardox 400 materials are more expensive than SM490A. To reduce the costs of the product, design improvement is needed to optimize the use of material. The design improvement method that uses in this study is according the optimization method, that is sizing and shape optimization. After improvement the design, to predict how long the boom component can be used, fatigue life prediction is calculated using Goodman’s theory
Alharisy Aji Aji
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 64-74; https://doi.org/10.33021/jmem.v6i2.1594

Abstract:
Saat ini di indonesia sepeda motor merupakan alat tranportasi yang sudah di produksi massal. penggunaan sparepart sepeda motor antara yang merek satu dengan merek yang lainnya sudah umum dilakukan dikarenakan komponen tersebut terkadang sulit didapatkan di pasaran. Entah karena sparepart sepeda motor tersebut tidak lagi diproduksi oleh pabrikan atau memang ada faktor-faktor lain yang mempengaruhinya. Poros adalah salah satu komponen sepeda motor , dimana poros merupakan salah satu bagian yang terpenting dari setiap mesin. Peranan utama sebuah poros adalah untuk mentransmisikan daya dari satu elemen mesin ke bagian elemen mesin lainnya. Daya tersebut dihasilkan oleh gaya tangensial dan momen torsi yang hasil akhirnya adalah daya tersebut akan ditransmisikan kepada elemen lain yang terhubung dengan poros tersebut. Poros roda merupakan salah satu komponen yang saangat penting dari sebuah sepeda motor karena poros berfungsi untuk menopang body, beban kendaraan itu sendiri maupun beban luar pada kendaraan dalam hal ini manusia atau barang muatan pada sepeda motor. Sehingga di perlukan poros yang baik untuk mencapai fungsi dari poros tersebut. Dipenelitian ini akan membahas tentang Poros dengan beban puntir dan lentur yang bertujuan untuk memberikan pengetahuan tentang poros depan, Lebih menambah wawasan pengetahuan dalam bidang otomotif dan Mampu merencanakan secara sistematis elemen-elemen mesin yang ada pada system kerja poros. Perhitungan Beban Luar, Perhitungan Diameter Poros, Jadi hasil dari perhitungan poros bahwa diameter 9.9 mm aman digunakan sesuai dengan standard, dengan diameter poros actual dilapangan yaitu 10 mm
Ardhi Bebi Laksono
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 106-118; https://doi.org/10.33021/jmem.v6i2.1550

Abstract:
This research was taken at one of the mechanical engineering companies produces customize spare parts, special purposed machinery, automation system integrator and robotic installation. The company has problem high cost operation warehouse, need space expanding production line, stockopname problem, picking failure, high cycle time operation, logistic efficiency, and inventory cost. These problems have impact to company performance which need cost down, increase efficiency and productivity with minimum defect. The data has shown company needs additional 157m2 to expanding new line, has 4% picking defect, there is 200 million operational cost over, 150sec cycle time, 7% lost part and risk cyber data security. Due to the importance of the problem, the company needs to evaluate and solve the problem which has impact to company performance, especially in the warehouse. DMAIC (Define Measure Analyze Improve and Control) approach is applied to comprehensively explore the problem and comes out with alternatives solution. Two alternatives were developed. The criteria for selection used were i.e. cost; accuracy, security, safety, productivity, cycle time, and minimize defect It was concluded that the application of automated storage and retrieval system (ASRS) was selected as it dominates in many aspects compare to expanding the current one. This implementation of ASRS approved that this new system answers the current warehouse problem
Irwan Anto Mina, Mokh. Sidqi Fahmi
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 11-20; https://doi.org/10.33021/jmem.v5i1.983

Abstract:
Excitation system is a system that conducts electric current in the same direction as a generator in a power plant, so that it produces electricity and a large voltage on the increase in the excitation current. In modern regulatory systems, excitation plays an important role in controlling the stability of a development because it involves load fluctuations, so excitation as a controller will require control of the generator output such as voltage, current and power factors in a necessary manner. If the excitation current rises, the reactive power supplied by the system generator will increase otherwise if the reactive power supplied will decrease. If the given excitation current is too small, the reactive power flow will move from the system to the generator so that the generator absorbs the reactive power from the system. This situation is very dangerous because it will cause excessive savings on the stator.Keywords: Generator, excitation system, transformer, rectifier.
Tono Sukarnoto, Ricky Harto Nugroho, Yusep Mujalis
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 22-31; https://doi.org/10.33021/jmem.v6i1.1429

Abstract:
Kementerian perhubungan dalam hal ini Direktorat Jenderal Perhubungan Darat mengeluarkan surat edaran Nomor: SE.2/AJ.307/DRJD/2018 yang mewajibkan pemasangan teralis pelindung bawah pada kendaraan barang dengan berak kotor maksimum 3500 kg. Pelindung ini untuk melindungi dinding belakang kabin dari dorongan muatan yang bergeser pada kondisi tertentu. Kendaraan pick up Daihatsu Himax awalnya belum dilengkapi dengan pelindung dimaksud. Untuk memenuhi surat edaran tersebut dibuatlah pelindung yang selanjutnya disebut lower guard frame (LGF). Penelitian ini mengevaluasi kinerja dari LGF terhadap beban Tarik dengan cara pengujian dan melakukan analisis kekuatan dengan metode elemen hingga. Hasilnya LGF cukup kuat untuk diaplikasikan serta terdapat perbedaan hasil yang signifikan antar pengujian dengan analisis metode elemen hingga.
Ariq Naufal Rabbani, Ken Risa Ayu Ndaru Ningrum, Alvin Widjaya, Farid Triawan
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 101-113; https://doi.org/10.33021/jmem.v5i2.1059

Abstract:
This paper discusses the methodology of design and analysis of a child seat for motorcycles. After realizing the dangers of an unrestrained child in motorcycles, this seat offers a solution to the problem. The seat features sliding beams that allow the user to access the under-seat compartment of the motorcycle and the fuel tank, without requiring any disassembly of the child seat. The dimensions are measured and considered when designing in a graphical application. Once the assembly drawing is completed, the seat is analyzed to identify critical parts of the seat to ensure failure does not occur. It is concluded that our design can withstand static loading but is predicted to fail due to fatigue after 81× 103 cycles under the assumption of accelerating from 0 to 50 km/h in 5 seconds. However, since that is not deemed to be fully optimized due to having a finite life, the material and dimensions are changed so that an infinite life can be predicted.
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 48-56; https://doi.org/10.33021/jmem.v5i1.919

Abstract:
Additive manufacturing (AM) or commonly called 3D printing (3DP) and rapid prototyping (RP) is a technique of blending materials by either fusion, binding, or solidifying materials. Despite many advantages of AM, there is a drawback of AM such as the surface quality may not be as good as subtractive machining (SM) process, therefore it will be better to have the initial shape forming process with AM and then finishing the required surface with SM process within a single setup. This paper presents the preliminary design of hybrid AM-SM machine to process a resin based material. The design includes structural design and control design of the machine using the material and firmware widely available in the market. Keyword: Additive, Subtractive, Manufacturing, Hybrid Machine
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 32-41; https://doi.org/10.33021/jmem.v6i1.1481

Abstract:
Universal Testing Machine or UTM (Universal Testing Machine) is a material testing machine that has more than one type of material testing. The purpose of this research is to design and analyze the strength of the UTM construction for tensile and bending tests. This machine uses a hydraulic jack as a power source to provide the required load. The design is limited to a load of 1.4 tons while the maximum construction load is 5 tons according to the hydraulic jack capacity. The method used in this study begins with a design using CAD and then analyzed with the finite element method. From the results of the analysis and evaluation, the designed tool can be used safely in accordance with the specifications used. The results showed that from the experimental results on the tensile and bending test specimens, both tests were successfully carried out. The tensile test was carried out with SUS 304 and SS400 with different thicknesses with dimensions according to ASTM E8 standards, while the bending test was carried out on ASTM A36 material with a size of 200 x 40 x 6 mm. After the test is carried out, the construction of the machine is checked for possible defects due to the test, namely the upper and lower clamps, punches and dies, and the engine frame. As a conclusion, after testing, it turns out that no damage or defects were found in all the parts examined
, Rakha Amrillah Fattah
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 119-126; https://doi.org/10.33021/jmem.v6i2.1573

Abstract:
The method of producing items through synchronously depositing material level by level, based on 3D digital models, is named Additive Manufacturing (AM) or 3D-printing. Amongs many AM methods, the Fused Deposition Modeling (FDM) technique along with PLA (Polylactic acid) material is commonly used in additive manufacturing. Until now, the mechanical properties of the AM components could not be calculated or estimated until they've been assembled and checked. In this work, a novel approach is suggested as to how the extrusion process affects the mechanical properties of the printed component to obtain how the parts can be manufactured or printed to achieve improved mechanical properties. This methodology is based on an experimental procedure in which the combination of parameters to achieve an optimal from a manufacturing experiment and its value can be determined, the results obtained show the effect of the extrusion process affects the mechanical properties.
Agung Sutrisno
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 42-52; https://doi.org/10.33021/jmem.v6i1.1301

Abstract:
One way of processing agricultural products is by drying process. It is a process of reducing water content to a certain extent so that it can inhibit the rate of damage to agricultural products (rice) due to biological and chemical activities. Drying is the last step in a series of operations, and the drying product is usually ready to use. The goal of this research is to design Paddy Drier with 1000 Kg capacity. The result of the study showing the design specification of the drier
Adam Fathlevi, Rudi Suhradi Rachmat, Azhari Sastranegara
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 57-74; https://doi.org/10.33021/jmem.v5i2.994

Abstract:
Gear is one of the most important part of power transmission system in a vehicle, and as the time goes by there possibly some failure happened on the gears. However, there is no information provided by car manufacturer regarding the life and the material of the gears. This report presents the analysis of the planetary gear used in Toyota Rush AT year made of 2012. The objectives of the research are: to study the planetary gear mechanism and how it works; to analyze the force and stress acting on the gears; and to select a suitable gear material that can withstand against the loads that happen on the gear. The research methodology is started with finding the gear dimension and gear ratio. The force acting on gear is calculated based on the torque and rotation speed provided in car specification. Then the selection material is carried out based on the amount of stress applied on the gear teeth that were calculated using AGMA standard formulation. Finally, the fatigue life prediction of the gears is calculated based on the previous stress acting on the gears. The calculation result suggested AISI 1050 steel as the selected gear material that can carry the bending stress of 476 MPa and categorized as low to high fatigue cycle.
Irwan Anto Mina
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 75-89; https://doi.org/10.33021/jmem.v5i2.1260

Abstract:
Preventive Maintenance is every activity undertaken to keep each component tool running in accordance with the expected conditions, through inspection, detection and prevention of total damage that is sudden (breakdown). Breakdown voltage or diode voltage drop is the minimum voltage value at the diode to be able to flow electric current. The research method used is qualitative research with a descriptive approach. In this study, the authors conducted data collection through: (1) direct observation (2) Retrieval of data using the Magger tool (3) literature study. The results of the study stated that in the examination and analysis of dissolved gas content (Dissolved gas analysis, DGA), to prevent the occurrence of: (partial) discharges, thermal failure (thermal faults), deterioration/deterioration of paper insulation/lamination. Insulation Resistance is a test to see the strength of insulation against physical and chemical damage. Damage that often occurs in the EAF 7 transformer is a breakdown voltage and an overheat transformer because the room temperature is not cold due to the transformer close to the cooking place or iron melting. Keywords. BDV, DGA, insulation resistance, maintenance, transformer
Muhammad Rizqi Banuaji
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 1-10; https://doi.org/10.33021/jmem.v6i1.1466

Abstract:
Salah satu alat yang sangatlah penting dan vital dalam sebuah kendaraan adalah rem. Rem adalah perangkat mekanis yang menghambat gerakan dengan menyerap energi dari sistem yang bergerak [1]. Rem cakram mempunyai beberapa komponen primer yaitu piringan cakram, master rem, piston, selang rem, kaliper rem, & kampas rem. Rem cakram bekerja menggunakan menjepit piringan cakram yg umumnya dipasangkan dalam roda kendaraan, buat menjepit piringan cakram dipakai kaliper yg digerakkan sang piston buat mendorong sepatu rem (brake pads) ke piringan cakram. Oleh lantaran itu, perancangan & perhitungan dalam sistem rem cakram sangat penting agar memenuhi kriteria yg diperlukan dan bisa mengetahui keamanan dalam sistem rem tersebut, tetapi tidak mengabaikan segi ekonomisnya. Pada paper ini kajian difokuskan pada perhitungan besar gaya yang di transmisikan pada setiap proses pengereman dan juga menghitung umur dari kampas rem cakram pada motor honda scoopy ESP FI 110cc tahun 2017. Hasil dari paper ini memperoleh gaya tangan (Ftangan ) sebesar 15,14 Kgf, gaya piston (Fpiston ) sebesar 31,81 Kgf, gaya tekan piston pada kampas (F) sebesar 203,66 Kgf(2 kampas), gaya pengereman (𝑃𝑣 ) sebesar 69,71 Kgf. Dari hasil akhir yang di dapat dari perhitungan umur kampas rem cakram motor Honda Scoopy ESP FI 110cc yaitu selama 800 jam. Jika diasumsikan pemakaian kendaraan rata-rata 3 jam perhari, maka umur kampas rem cakram bisa bertahan selama 8,8 bulan.
Dandun Mahesa Prabowoputra
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 88-94; https://doi.org/10.33021/jmem.v6i2.1471

Abstract:
Energi listrik merupakan kebutuhan primer dalam kehidupan sehari-hari. Perkembangan teknologi mengakibatkan meningkatnya kebutuhan energi listrik setiap tahunnya. Energi baru terbarukan memasok kebutuhan energi listrik nasional sebesar 14%. Di sisi lain, pemerintah mengharapkan komposisi energi baru terbarukan sebesar 23% hingga 31% pada tahun 2050. Hal ini menunjukan bahwa energi baru terbarukan masih memiliki gap yang cukup tinggi. Penelitian ini merupakan salah satu upaya dalam pengembangan energi baru terbarukan, terutama pada pembangkit listrik mikro-pico hidro. Penelitian ini dilakukan menggunakan metode Computational Fluid Dynamics menggunakan Aplikasi Ansys dengan CFX Solver. Penelitian dilakukan untuk mengetahui pengaruh jumlah sudu pada hidro-turbin cross-flow terhadap performa Coefficient of Power. Peneltian dilakukan pada rotor dengan dimensi diameter 80 mm, panjang 130 mm dan sudut sudu 15°. Variasi jumlah sudu dilakukan pada jumlah sudu 8, 12, 16, dan 20. Simulasi dilakukan pada steady state, dan menggunakan tipe turbulen Shear Stress Transport. Turbin cross-flow beroperasi pada kecepatan air 3m/s dengan kecepatan sudut pada interval 50 sampai 350 RPM. Hasil menunjukan Coefficient of Power Maximum yang dihasilkan untuk sudu 8,12, 16 dan 20 adalah 10,8%; 14,1%; 16,8% dan 20,1%. Dari hasil tersebut menunjukan performa maksimal dihasilkan oleh hidro-turbin tipe cross-flow dengan jumlah sudu rotor 20.
Gatot Setyono
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 114-121; https://doi.org/10.33021/jmem.v5i2.1136

Abstract:
Hydroxy Gas (HHO) has been identified as an efficient alternative energy source. HHO is considered an alternative fuel. It can be applied alone or mixed with other kind of fuels in different ratios. In this analysis, the composition of HHO-ethanol was mixed in different variations. Ethanol-HHO was chosen because of its high-octane rating yet low exhaust emissions, and ease of obtaining from engine products. It has been applied on fuel prepared by mixing it with gasoline in various ratios (E30-HHO, E40-HHO, and E50-HHO). The ethanol-HHO mixture has been used in a single-cylinder 4-stroke spark machine for performance, by varying speed of engine from 4000 to 9000 RPM and by applying a platinum spark plug electrode type. In experiments, engine power, average effective pressure (MEP), specific fuel consumption (SFC), and thermal efficiency have been analyzed. The analysis of combustion is accomplished by taking a pressure cycle in the chamber, monitoring the automatic control of engine control unit (ECU) and ensuring utilization in the same parameters of the various fuels tested, in addition to the fuel injection time, which increases with increasing ethanol percentage. Optimal power, MEP and thermal efficiency values are obtained with ethanol-gasoline (E50-HHO) mixture which is operated at 7200 rpm, an increase of about 5% compared to gasoline. Significant reduction in SFC was observed using HHO-ethanol mixture, reduced by about 6% compared to gasoline.
Lydia Anggraini, Ida Bagus Madra Gana
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 1-10; https://doi.org/10.33021/jmem.v5i1.787

Abstract:
This paper presents a study of a composite car body using finite element method. The body is made of surface model and the study is conducted to simulate the possible deformation of the body under certain load. The objective is to find tha ideal thickness of the composite body as to minimize the vehicle weight. In this research, the strength analysis using finite elements will be explained and the deformation of the body is investigated for finding a possibility to improve this research.
Zaimar Zaimar
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 53-63; https://doi.org/10.33021/jmem.v6i1.1246

Abstract:
This paper presents the effects of the diverse serrated blade configurations on airflow characteristics of a modified centrifugal fan by CFD. This application is investigated to improve aerodynamic performance. These configurations (USB, ISB, USB, OSB) are simulated at the impeller speed levels by CFD. Then tested to analyze airflow characteristic values by ANCOVA test. The simulation results show that the BSB configuration achieves the high static pressures about 84.5-214.7 Pa in the wall zone. While the ISB generates the lower TKE in all the zones, except in the impeller zone. It produces about 0.51-12.47 m2s-2 TKE in the wall zone. The ANCOVA test results indicate that the effects of the impeller speed are very significant (a < 0.01) on the airflow characteristics in all the zones, except for static pressure is no significant (a > 0.05) in the impeller and fluid flow zone. The effect of the serrated blade configurations is very significant on static pressure in the inlet and wall zone, and significant (a < 0.05) in the fluid flow zone. While it is very significant to air velocity in the impeller, fluid flow, and wall zone, and very significant on TKE in the impeller zone and outlet zone.
Bisma Herlambang
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 21-27; https://doi.org/10.33021/jmem.v5i1.960

Abstract:
Valve (valve) as one of the industrial products, is needed by companies engaged in controlling fluid flow for efficiency. This need is widely used by power companies and the oil and gas industry. The purpose of using valves is to limit and control liquids under high pressure conditions. One valve that is often used is the gate valve, which is a valve with a type of motion fully open and fully close. The demand for this gate valve requires a product with certain specifications to have a design with a good level of strength. In other words, a good valve product (valve), must have a good strength, safe and in accordance with the needs to be tested. This study aims to analyze the gate valve 2 9/16 WP 3,000 psi to ensure the valve produced is according to specifications, strong and resistant to fluid pressure. The method used is Finite Element Analysis (FEA) with the 2018 Solidworks software. The analysis is performed on the gate valve with a full open, full closed state and with gradual loading starting at 1,000 psi, 2,000 psi and 3,000 psi resulting from Computational Fluid Dynamics (CFD). The analysis was carried out at 300C, Based on the results of the analysis with FEA, it was stated that the gate valve 2 9/16 WP 3,000 psi was strong and safe to use. The safety factor value is significantly higher than the minimum permissible safety factor value.
Suhar Minto
Journal of Mechanical Engineering and Mechatronics, Volume 6, pp 11-21; https://doi.org/10.33021/jmem.v6i1.950

Abstract:
Alat pengahsil asap cair ini, merupakan pengembangan dari proyek President University sebelumnya, yaitu mesin pembuat arang sekam yang diproduksi dari bahan baku sekam yang kemudian diolah dan menghasilkan briket arang yang bisa dimanfaatkan sebagai bahan bakar alternative pengganti minyak atau gas. Mesin rancangan pertama tersebut kami rasa perlu disempurnakan atau ditindaklanjuti, yaitu dari hanya mesin pembuat arang sekam sekaligus kami kembangkan sebagai pembuat asap cair. Jadi kami mengoptimalkan fungsi mesin tersebut dengan cara melakukan pengembangan dengan memanfaatkan asap hasil dari pembakaran sekam dari mesin pembuat arang sekam menjadi asap cair.Dalam hal ini penulis fokus pada sistem pendingin mesin asap cair. Sistem pendingin memiliki peranan sangat penting dalam alat penghasil asap cair. Karena system ini akan menentukan optimalisasi dari proses pirolisis yang didalamnya ada proses kondensasi asap mencari cairan. Jadi dalam proses ini terjadi proses perpindahan panas konduksi dan konveksi. Semakin bagus system pendingin yang dirancang, diharapkan menghasilkan hasil produksi yang semakin baik karena kesempurnaan proses kondensasi di kondensor mesin asap cair.
Kusnindar Priohutomo, Endah Suwarni
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 90-100; https://doi.org/10.33021/jmem.v5i2.1017

Abstract:
Kebutuhan akan kapal Mini LNG (small LNG carrier) di Indonesia semakin meningkat seiring dengan meningkatnya kebutuhan pasokan LNG dari LNG field ke pulau-pulau di Indonesia bagian timur. Distribusi LNG ke pulau-pulau di Indonesia bagian timur kurang efektif bila menggunakan kapal LNG yang berukuran besar karena tidak adanya infrastruktur pipa gas untuk menyalurkan LNG dari terminal LNG di pelabuhan ke pengguna. Dengan kapal mini LNG maka pendistibusian LNG bisa menggunakan tangki-tangki LNG kecil yang nantinya akan dibawa oleh kendaraan darat setelah kapal bersandar di pelabuhan. Untuk mendesain sebuah kapal mini LNG diperlukan berbagai macam perhitungan yang tepat agar nantinya kapal yang dibangun akan memiliki performa yang baik dan efisien. Salah satunya yang harus dihitung adalah tahanan kapal dan daya mesin yang akan dipasang. Pada paper ini kajian difokuskan pada perhitungan tahanan kapal dan daya mesin menggunakan metode simulasi numerik. Hasil dari paper ini untuk tahanan kapal pada kondisi full load sebesar 234,33 kN dan untuk kondisi half load memiliki tahanan sebesar 208,18 kN. BHP engine pada kondisi full load sebesar 2852,7 HP dan pada kondisi half load sebesar 2533,5 HP
Liwiryon Sudarso, Rudi Suhradi Rachmat
Journal of Mechanical Engineering and Mechatronics, Volume 5, pp 28-37; https://doi.org/10.33021/jmem.v5i1.942

Abstract:
Screw conveyor is a material transfer equipment that is often used in various types of industries. However, the screw conveyor also has some disadvantages if it used in the blasting room serves to transport the steel grit which is the main material in the blasting process. This screw conveyor often suffers damage to the pillow block due to the inclusion of steel grit. Based on field conditions, the screw conveyor transport capacity is considered inefficient because some of the steel grit left in the gap between the screw and the curved steel plate and not get transported by screw conveyor. In order to overcome the problems, a belt conveyor is chosen to replace the screw conveyor. The method used in this final project firstly is identifying the problem of the existing screw conveyor and observing the screw conveyor data. Secondly, by using the screw conveyor data, the author makes a design of a belt conveyor as the replacement of the existing screw conveyor. As a result, the belt conveyor design has been created with a calculated capacity of 236.81 tons/hour, which is greater than the existing screw conveyor. and is designed not to be easily damaged due to the inclusion of steel grit as it happened in the screw conveyor. Keywords: Screw Conveyor, Belt Conveyor, Steel Grit, Blasting Room, Pillow Block, Capacity, Design
, Willy Tambunan,
Journal of Mechanical Engineering and Mechatronics, Volume 4, pp 61-70; https://doi.org/10.33021/jmem.v4i2.825

Abstract:
In the current industrial era a lot of progress from machine technology or methods used by companies in their production systems. So that the system of production and productivity in the company takes place effectively, safely, and efficiently. One way to achieve this is by paying attention to the occupational health and safety (K3) of the employees in the company. The identification of work accidents used in this study uses the Hazard and Operability Study (HAZOP) method. In the work system in the PDAM there is work that is vulnerable to work accidents such as in the field of maintenance or maintenance on machinery, water treatment production systems, and work carried out in the workshop. From the results of field observations at the PDAM Tirta Kencana workshop and interviews with workers, there were 50 potential hazards that existed at the PDAM Tirta Kencana workshop and were then classified according to the type of sources into 12 sources of hazards. There are 3 levels of work accident risk from hazard sources obtained from the risk matrix assessment, which has the potential to cause work accidents. The level of risk is an extreme risk of 1 source of hazard, a high risk of 5 sources of hazard, and a moderate risk of 6 sources of hazard. The proposal of the results of this study is to conduct OSH training, conduct work supervision, and perform maintenance on machinery and equipment.
Irwan Anto Mina
Journal of Mechanical Engineering and Mechatronics, Volume 4, pp 87-95; https://doi.org/10.33021/jmem.v4i2.856

Abstract:
Information needs for one's color perception are needed in the fields of medicine, engineering, astronomy, biomedicine and so on. The demand for accurate assessment of color perception must be met by the perception detection tool used. Ishihara's test, as a perception detection tool that is still used today has insufficient accuracy. This research aims to create a system that can detect a shift in one's color perception, relative to the average color perception of a number of respondents. Through plotting the respondents' perception points, in the CIE coordinate system (Commission International de I'Eclairage) XYZ can be calculated the average euclidean distance, ED, relative to the reference point and the distribution of x and y groups of perception points around the point of reference. Both size, euclidean distance and distribution are used as indicators of average color perception so that an assessment of one's color perception is given based on the results of comparison between color perception points and color perception indicators. The tool used to do the test is Delphi version 7.0 software. the research material used is the RGB (Red, Green, Blue) color image format. The results of a person's color perception study are divided into three levels, namely: (1) "normal" assessment if euclidean (ED) perceptions are smaller than the euclidean (ED) average (2) the "somewhat normal" assessment if the distribution of x and y is smaller rather than the color of perception and the distribution of x and y (3) the assessment is "abnormal" if the color of perception is greater than the max distribution of x and y. A new perception point assessment that is in level one is used to up-date prevailing perception indicators. Up-dating condition constraints affect the quality of the threshold average perception specifically and the quality of the results of the perception detection system in general.
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