Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi

Journal Information
ISSN / EISSN : 2655-1861 / 2716-2923
Published by: Universitas Pancasila (10.35814)
Total articles ≅ 33
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Ari Wibowo, Firman Noor Hasan, Rika Nurhayati
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 239-248; https://doi.org/10.35814/asiimetrik.v4i1.3577

Abstract:
Since Indonesia was affected by the Covid-19 pandemic, one of the sectors affected was Education. The government makes an online learning system policy where the system is run with an online process. Not a few of them complained about the limitations of activities issued by the government. Twitter social media is often used to express opinions about concerns about programs issued by the government. The Twitter data crawling process was carried out using the hashtag "learning from home" to get as many as 1,000 datasets, followed by the process of removing duplicates which left 524 datasets and then carrying out the implementation stage of the Naïve Bayes Classifier Algorithm. The purpose of this study was to determine the number of positive and negative sentiments from the dataset labeling classification and to determine the accuracy results of using the Naïve Bayes Classifier method as well as the results of evaluation tests on positive and negative sentiment datasets. Based on the experiment, positive sentiment was obtained as many as 480 and negative sentiment as many as 44 out of 524 datasets. The accuracy results in the evaluation test process get results of 88.5% where negative sentiments get a precision value of 12%, recall 17%, and f1-score 14%, while positive sentiments get a precesion value of 95%, recall 93%, and f1 -score 94%.
Widodo, Ade Irvan Tauvana, Fatkur Rachmanu, Lukman Nulhakim, Syafrizal, Mokhamad Is Subekti
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 221-230; https://doi.org/10.35814/asiimetrik.v4i1.3466

Abstract:
R290 is a type of natural refrigerant that has ODP = 0 and GWP = 4. While R32 from synthetic materials has ODP= 0 and GWP = 675 both are refrigerants used in Split AC. With this high GWP, it can have a damaging impact on the atmosphere. The advantage of R290 is that it has a lower density compared to R32, which can save the number of fillings in the AC unit by ±30% of the previous amount of refrigerant in the same volume. R290/R32 was flammable with LFL= 2%/13% and UFL= 10%/33%. The purpose of this study was to analyze the performance of R290 as a substitute for R32 on an AC-split unit with a capacity of 9,000 Btuh/hr. The steps used in the test are that the AC unit is placed in an open room with ambient temperature around 32°/80°C. The test was carried out until it reaches the optimal and stable temperature, then data is collected. The results of data collection from the evaporator air temperature R290/R32 = 21.4°C/23.0°C, condenser air temperature = R290/R32= 35°C/38.5°C, suction pressure= 90 psig/130 psig and discharge 200 psig/420 psig. The test data were analyzed and calculated using the Mollier Chart software with the results = R290/R32 = refrigeration effect = 344.8/272.2 kJ/kg, compression work = 12.18/13.02 kJ/kg, COP = 28.3/20.9, compression ratio = 2.2/3.2, strong electric current 4.98/5.73 A. From the decrease in electric current of R290 obtained a savings of 13.3% was obtained when converted to electricity bill payment and get a profit of 45,886/month.
Armansyah, Juri Saedon, Ferdyanto, Nely Toding Bunga, James Julian
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 143-152; https://doi.org/10.35814/asiimetrik.v4i1.3183

Abstract:
Issues in friction stir spot welding focus mainly on the mechanical characteristic affected by its Hardness. This Hardness must be maintained by evenly temperature distribution in weld zones during welding. The process parameters are mainly responsible for the development of the hardness of the friction stir spot weld. This study presented the hardness evaluations on the friction stir spot weld via the Hardness-Vickers test and analysis of the temperature distribution in the weld zones via the finite element method. The workpiece samples used in this study were Aluminium alloy 5052-H112 with a thickness of 2 millimeters in the lap-shear mode based on 3 main parameters at low and high levels of parameters configuration. The results obtained via the Hardness-Vickers tests exhibited a value of 42-HV located in the middle of the spot-weld center using a low-level parameters configuration. This value increased to 64-HV around the vicinity of the keyhole. And then the value decreased to 53-HV outside the keyhole, about 6 millimeters from the spot-weld center. Using high-level parameter configuration, the Hardness-Vickers value increased to 61-HV in the middle of the spot-weld center. The value then increased to 76-HV in the vicinity of the keyhole. Furthermore, the value decreased at 60-HV outside the keyhole, which ca 6 millimeters away from the spot-weld center. The temperature distribution of the weld zones achieved 480 oC in the vicinity of the keyhole using the low-level parameter configuration. Slowly, the temperature declined to 380 oC at 6 mm away from the friction spot-weld center in the HAZ. Using the high-level parameters configuration, the temperature distribution reached 540 oC in SZ, and slowly reduced to 425 oC in HAZ. Based on the results, it was found that by using high-level parameters configuration the hardness of the friction stirs spot weld exhibited better Hardness-Vickers value and evenly temperature distribution in the weld zones.
A. R. Indra Tjahjani
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 231-238; https://doi.org/10.35814/asiimetrik.v4i1.3636

Abstract:
The lively installation of billboards in big cities adds to the beauty of the town. DKI Jakarta has made improvements along Jalan M.H. Thamrin arrived at Jl. Fatmawati. The purpose of the study was to find out the opinion of people who crossed the study area in the comfort of driving at night. The purpose of installing billboards is as a promotion media, as well as information media from various agencies. The method used is the theory of road performance and community responses collected using a questionnaire via google form to the community selected based on the purposive sampling method, obtained 47 respondents in the age range of 22-58 years. The level of service that shows road performance is at the level of service (LOS) A where the value of DS = 0.1 and the average speed on Fatmawati road for the Lebak Bulus direction is 20 km/hour with LOS B, while the Blok M direction is 26 km/hour with LOS B. Likewise the speed on the road M.H. Thamrin the direction of Jl. Jend Sudirman is 5 km/hour with LOS D, and the direction of Jl. Jend. Sudirman is towards Jl. Thamrin 40 km/hour. Respondents consisting 87.2% of these men stated that the existence of billboards in various forms needed to be maintained (53.2%). With LOS C, it is recommended that the installed billboards be reduced in lighting so as not to interfere with the focus of road users who are passing. However, respondents also said that the installation of billboards in the form of billboards with lighting was widely used in Europe and America.
Juan Setiawan, Steven Darmawan, Harto Tanujaya
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 153-162; https://doi.org/10.35814/asiimetrik.v4i1.3100

Abstract:
The cross-flow turbine is one of widely used impulse turbine in power generator system due to it’s simple design and ability to be applied to a wide range of head and flow conditions. The flow in a cross-flow turbine flows in a crossed manner and works in 2 stages which could affect the turbine’s performance. Hence the visualization of these flow behavior could indicate the performance. Complexity of the flow inside the runner require the usage of CFD Method to visualize the flow, leaving the gap since numerical model also rely on turbulence model. The purpose of this study is to analyze the flow pattern in the nozzle and runner on a cross-flow turbine using the RNG k-ε turbulence model in ANSYS 2021 R2 Academic Version software. The simulation was carried out with 5 variations of nozzle inlet velocity: 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6.487 m/s. The working fluid is assumed to be 1 phased water, with nozzle inlet pressure of 1.05 Pa, temperature of 24.85 oC and RNG k- ε turbulence model which compared to STD k-e turbulence model from the previous study. The results show that the simulation with the RNG k-ε turbulent models resulted in differences in the velocity and pressure profiles of Stage 1 of 3.353% and 87.679% and Stage 2 of 13.653% and 21.826% compared to simulation with k-ε STD models.  
Kiki Kunthi Lestari, Setia Damayanti, Siti Rachima Mumpuni, Margaret Arni Bayu Murti, Listya Nindita, Ashri Prawesthi Dharmayati, Ramadhani Isna Putri
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 171-176; https://doi.org/10.35814/asiimetrik.v4i1.3400

Abstract:
Micro, Small, and Medium-Sized Enterprises are one of the businesses that sell domestic products that are of comparable quality to foreign products. The establishment of the Sarinah shopping centre as a venue for the sale of micro, small, and medium-sized enterprise products such as souvenirs, apparel, and accessories are evidence of this. To supporter Sarinah's efforts, it is vital to have retail locations with aesthetically pleasing and practical interiors. This study discusses the notion of interior space for MSME retail locations in Sarinah Malang and Sarinah Semarang as examples. Combining classroom learning with the application of social media as part of public education, particularly regarding the history of Sarinah and the design of space in MSME outlets in a Nusantara-style, was the strategy utilised to create the design. Concepts, designs, colour schemes, and materials; themes, interior styles, floor plans, sectional views, details, and viewpoints are the outcomes of this design process.
Aji Digdoyo, Fauzhia Rahmasari, Agus Budi Djatmiko, Erma Yuniaty, Saepul Anwar
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 193-200; https://doi.org/10.35814/asiimetrik.v4i1.3442

Abstract:
The moment of inertia of the mass is a quantity that is very much needed in designing high-speed engine parts, because it can cause a very large force and the magnitude can be thousands of times its weight. There are two ways to determine the moment of inertia, namely theoretically or testing, if using theory if the shape of machine parts is complicated, of course it is also difficult to determine the magnitude and the second way, namely by testing, it is very easy to get the price of the moment of mass inertia sought even though the shape is complicated. The moment of inertia test equipment is used to determine the value of the moment of inertia of a machine element by means of testing. This tool is also the result of its own design and engineering, which has never been developed by another party. This tool is intended to assists in the Research Development Program in the Department of Machinery, Faculty of Industrial Technology, Jayabaya University. The design of the Test Equipment is based on the Torque Moment principle where the system is considered to have mass and elasticity and from a practical and economical point of view it is very easy to implement. The results of testing the pitch direction and yaw direction with the same test object, namely the connecting rod, it turns out that the test results are Ip = 0.00298 kgm2  and Iy = 0.00304 kgm2 and for testing the direction of rotation using a mass disk of aluminum obtained Ir = 0.00125 kgm2 , the calculation results obtained Ir = 0.1271 kgm2, not too far away or it can be said that the three-axis test equipment, namely the direction of pitch, yaw and rolling can be used for testing the moment of mass inertia for machine elements.
James Julian, Waridho Iskandar, Fitri Wahyuni, Ferdyanto, Nely Toding Bunga
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 185-192; https://doi.org/10.35814/asiimetrik.v4i1.3437

Abstract:
The computational study discusses the application of the co-flow jet technique as a fluid flow control device on the NACA 0015 airfoil. The numerical equation used is the RANS equation with the k-ε turbulence model. There are three variations of the mesh proposed in this paper. The first variation is a fine mesh with 100,000 elements. The second variation is a medium mesh with 50,000 elements. Meanwhile, the third variation is coarse mesh with 25,000 elements. Based on the mesh independence test results, the mesh with the lowest error value is the fine mesh. Co-flow jet is proven to control fluid flow on the upper side of NACA 0015. Co-flow jet can also improve the aerodynamic performance of NACA 0015 by increasing Cl and decreasing Cd. The increase in Cl was 114% and the decrease in Cd was 24%. The fluid flow separation on the upper side of the airfoil can also be handled well by the co-flow jet.
Rika Nurhayati, Satria Nusantara Achmad
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 249-256; https://doi.org/10.35814/asiimetrik.v4i1.3473

Abstract:
The lack of knowledge of dental and oral health and the limited number of dentists causes low public awareness of dental and oral health. This condition makes some people put aside efforts to prevent and treat dental and oral diseases. Therefore, this study has created an expert system for early diagnosis of dental and oral diseases, so that it can help the public to find out about the dental and oral diseases they are suffering from and overcome the problem of scarcity of dental and oral experts. As for designing the decision support system are use the Expert System method for evaluating criteria and sub-criteria, with the Personal Home Page (PHP) programming language, MySQL as a database server, APPSERV as a web server. The results of this information system design are web applications. to input data on the symptoms of the disease suffered by the patient, then carry out the process of selecting the symptoms of the disease and produce a diagnosis result in the form of disease and healing solutions.
Candra Wahyu Setyawan, Syaripuddin, Ahmad Lubi, Ferry Budhi Susetyo
Jurnal ASIIMETRIK: Jurnal Ilmiah Rekayasa & Inovasi pp 209-220; https://doi.org/10.35814/asiimetrik.v4i1.3510

Abstract:
The better welding results are always a scientific challenge in welding engineering. This is to ensure the connection functions properly according to its designation. The main purpose of this study was to determine the effect of electrode drying temperature on the mechanical properties of ASTM A36 steel weld joint. This research was conducted at the Condet Welding Training Center and PT. Gamma Hepsi Condet. The tests carried out were visual tests, radiographs, and tensile tests. The results showed that the drying of the electrode E 7018 without an oven had a lot of welding defects on the inside in the form of porosity about 2 mm. The results showed that the highest tensile strength of 50.01 kgf/mm² was found in specimens using an electrode drying temperature of 230ºC.
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