Angkasa: Jurnal Ilmiah Bidang Teknologi

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ISSN / EISSN : 2085-9503 / 2581-1355
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Lado Rislya Prakasa, Djarot Wahju Santoso
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1071

Abstract:
Untuk mengetahui kekuatan struktur doubler dalam menahan terjadinya kegagalan akibat retakan yang disebabkan oleh cyclic loading, diperlukan suatu analisis tersendiri yang tidak terdapat pada panduan Structural Repair Manual (SRM). Cyclic loading dapat mengurangi kekuatan skin doubler secara bertahap (fatigue) hingga mencapai kegagalan (fracture).Pada penelitian ini akan dilakukan analisis crack growth rate dan jumlah siklus pembebanan yang dibutuhkan untuk memunculkan retakan dengan panjang tertentu (fatigue cycle) terhadap struktur doubler fuselage skin pesawat Boeing 737-900 Extended Range dengan station number 360-380 di antara stringer 6L-7L pada setiap panjang retakan dan ketinggian terbang simulasi. Analisis dilakukan menggunakan pendekatan numerik dengan metode Modified Virtual Crack Closure Integral (MVCCI) untuk mendapatkan nilai Stress Intensity Factor (SIF) melalui software berbasis metode elemen hingga. Melalui nilai yang diperoleh dapat diketahui bahwa nilai crack growth rate dan fatigue cycle berbanding lurus terhadap variasi panjang retakan dan ketinggian terbang simulasi yang diberikan. Nilai crack growth rate paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 5000 feet yaitu sebesar 2,964 mm/cycle, dan nilai tertinggi sebesar 5,471 mm/cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 40000 feet. Sedangkan, nilai fatigue cycle paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 40000 feet yaitu sebesar 2,540 cycle, dan nilai tertinggi sebesar 5,470 cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 5000 feet. Keywords Crack growth rate; Fatigue cycle; Struktur doubler References J. Roesler, H. Harders, and M. Beaker, “Mechanical Behavior of Engineering Materials Metals, Ceramics, Polymers, and Components, Berlin: Springer Science & Business Media, 2007. Boeing, “Chapter 53 Fuselage”, Chicago: Boeing Structural Repair Manual, 2018. H. N. Firmansyah, “Estimasi Nilai Faktor Intensitas Tegangan (KI) Tipe Center Crack Dengan Metode Numerik”, Conference SENATIK STT Adisutjipto Yogyakarta, Vol. 2, Nov. 2016. H. N. Firmansyah, “Predicting Stress Intensity Factor (KI) Of Single Edge Crack Using Displacement Extrapolation Method”, Conference SENATIK STT Adisutjipto Yogyakarta, Vol. 4, Des. 2018. B. K. Venkatesha, K. P. Prashanth, T. K. Deepak,”Investigation of Fatigue Crack Growth Rate in Fuselage of Large Transport Aircraft using FEA Approach”, Global Journal of Researches in Engineering, Mechanical and Mechanics Engineering, Vol. 14, Jan. 2014. V. C. Raj, Aldo, Gowrishankar,”Study on the Fatigue Life Estimation of an Airframe Fuselage Window Cutout Panel”, International Journal for Research in Applied Science & Engineering Technology (IJRASET), Vol 6, Mei. 2018. N. V. Deepashri, M. Kalaiyapan,” Life extension of Structural Repairs – A Statistical Approach Towards Efficiency Improvement”, International Conference on Aerospace and Mechanical Engineering (AeroMech17), Vol 370, Mei. 2018. Kemendikbud,” Maintenance Practice”, 2014. A. B. Selan,” Analisis Damage Tolerance Dan Crack Growth Pada Alumunium 2024-T3 Dan Alumunium 7075-T7351 Menggunakan Perangkat Lunak Matlab”, Departemen Teknik Dirgantara Sekolah Tinggi Teknologi Adisutjipto, 2018. D. Roylance,” Introduction to Fracture Mechanics”, Departement of Materials Science and Engineering MIT, Juni. 2001. M. Milkota, S. Staib, S. Schmauder, Ž. Božić,”Numerical determination of Paris law constants for carbon steel using a two-scale model”, 6th International Conference on Fracture Fatigue and Wear, IOP Conf. Series: Journal of Physics: Conf. Series 843, Sep. 2017. http://dx.doi.org/10.28989/angkasa.v13i2.1071 Refbacks There are currently no refbacks.
Bahrul Jalaali, Eli Kumolosari
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1042

Abstract:
A CFD study of Water-Oil flow in the horizontal pipe was conducted using the VoF multiphase model coupled with the SST  turbulence model scheme. This study aimed to simulate the mixture flow characteristic by takes account temperature parameter. It was numerically solved using a finite-volume model utilized in Fluent software. The simulation results compared towards experimental showed good prediction on the particular flow pattern. In this study, the thermal parameter was then solved by utilizing energy equation coupled by multiphase model. The water flow temperatures were varied in ranged of 300-340K. The results showed that temperature affected reducing the viscosity of the fluid as well ass the density. Furthermore, the flow pattern changed whereby oil was above the water due to its viscosity and density. This study is beneficial for accessing the temperature effect on the water-oil flow as represented in the applied petroleum industry of oil-lifting. Keywords Water-oil; Multiphase; CFD; VoF method; Temperature References Ministry of Energy and Mineral Resource, “Handbook of Energy and Economic Statistic of Indonesia 2019”, Ministry of Energy and Mineral Resource, 2020G. Glatz, "A Primer On Enhanced Oil Recovery." Physics 240, Stanford University, Fall 2013. Satter, A., & Iqbal, G. M., “Reservoir Engineering: The Fundamentals, Simulation, and Management of Conventional and Unconventional Recoveries”, In Reservoir Engineering: The Fundamentals, Simulation, and Management of Conventional and Unconventional Recoveries, 2015. https://doi.org/10.1016/C2013-0-13485- Green, Don. W., Willhite, P., “Enhanced Oil Recovery”, SPE Textbook Series, 1998 A. Z. Abidin, T. Puspasari, and W.A. Nugroho, "Polymers For Enhanced Oil Recovery Technology," Procedia Chem. 4, 11, 2012. Goyal, K. L., & Kumar, S., “Steamflooding for Enhanced Oil Recovery. Developments in Petroleum Science”, 17(PB), 317–349, 1989. https://doi.org/10.1016/S0376-7361(08)70463-1 Johannes Fink, “Petroleum Engineer’s Guide to Oil Field Chemical and Fluid (2nd edition)”, Elsevier, 2015 Vladimir Alvarado & Eduardo Manrique , “Enhanced Oil Recovery”, Elsevier, 2010. https://doi.org/10.1016/C2009-0-30583-8 Huang, S., Cao, M., & Cheng, L., “Experimental study on the mechanism of enhanced oil recovery by multi-thermal fluid in offshore heavy oil. International Journal of Heat and Mass Transfer”, 122, 1074–1084, 2018. https://doi.org/10.1016/j.ijheatmasstransfer.2018.02.049 Mokheimer, E. M. A., Hamdy, M., Abubakar, Z., Shakeel, M. R., Habib, M. A., and Mahmoud, M., "A Comprehensive Review of Thermal Enhanced Oil Recovery: Techniques Evaluation." ASME. J. Energy Resour. Technol. March 2019; 141(3): 030801. https://doi.org/10.1115/1.4041096 Zhengbin Wu, Huiqing Liu, and Xue Wang, “3D Experimental Investigation on Enhanced Oil Recovery by Flue Gas Coupled with Steam in Thick Oil Reservoirs”, Energy & Fuels, 32(1), 279-286, 2018 DOI: 10.1021/acs.energyfuels.7b03081 Askarova, A., Turakhanov, A., Markovic, S., Popov, E., Maksakov, K., Usachev, G., Karpov, V., & Cheremisin, A., “Thermal enhanced oil recovery in deep heavy oil carbonates: Experimental and numerical study on a hot water injection performance”, Journal of Petroleum Science and Engineering, 194(April), 107456, 2020. https://doi.org/10.1016/j.petrol.2020.107456 Shuhong, W., Key, S., Company, P., & Min, H., “SPE 145005 A Case Study : A Successful Steam Flooding Project to Enhance O il Recovery of Low-permeability , Light-oil Waterflooding Reservoir Chunli” , Daqing Oil Company , Shen Dehuang , RIPED of PetroChina Company, 2011 Valencia, J. D., Mejía, J. M., Ocampo, A., & Restrepo, A. ,”Modelling dispersed chemical droplets injection in the gas stream for EOR applications. Society of Petroleum Engineers”, SPE Reservoir Characterisation and Simulation Conference and Exhibition 2019, RCSC 2019. https://doi.org/10.2118/196620-ms Deendarlianto, M. Andrianto, A. Widyaparaga, O.Dinaryanto, Khasani, Indarto, “CFD studies on the gas-liquid plug two-phase flow in a horizontal pipe”, Journal of petroleum science and engineering, Elsevier, 201 JShi, M. Gourma, H. Yeung, “CFD simulation of horizontal oil-water flow with matched density and medium viscosity ratio in different flow regimes”, Journal of Petroleum Science and Engineering, Elsevier, 2017. JShi, M. Gourma, H. Yeung, “A CFD study on horizontal oil-water flow with high viscosity ratio”, Chemical Engineering Science, Elsevier, 2021 JBrackbill, D. B. Kothe, C. Zemach, “A continuum method for modeling surface tension”, Journal of computational physics, Elsevier, 1992 JShi, H. Yeung, “Characterization of liquid-liquid flows in horizontal pipes”, AIChe Journal, Wiley, 2016 O. Alomair, M. Jumaa, A. Alkoriem, M. Hamed, “Heavy oil viscosity and density prediction at normal and elevated temperatures”, Journal of petroleum exploration and production technology, Springer , 2016 http://dx.doi.org/10.28989/angkasa.v13i2.1042 Refbacks There are currently no refbacks.
Samto Hadi Isnanto
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1093

Abstract:
Job satisfaction is an important issue in an organization. Job satisfaction has been talked about over and over again because of the importance it has in both individual and group behaviour, which will affect in the productivity of an organization. Even though the role of job satisfaction is important in an organization, it is sometimes unnoticed and ignored by the management which in turn results in a decrease of organizational work performance. This study aims to answer why job satisfaction is important and how to improve it in aviation industry. The method used in this research is a literature review by finding specific researches that corresponds to the topic discussed, which is job satisfaction, to integrate them into a concise conclusion. This research uses samples from published journals in the last 10 years (2011 – 2021) found through google scholar with the main variable job satisfaction. The result of this study shows that based on the literature reviews of different journals, job satisfaction proves to strengthen employee engagement and organizational commitment, decreases the rate of employee turnover and improves employee productivity. There are a few proven ways to increase job satisfaction in aviation industry which is creating a conducive/positive work environment, applying reward and recognition management, developing the potential skills of employees and continuous evaluation and measurement of employee job satisfaction.
Astika Ayuningtyas, Asih Pujiastuti, Anggraini Kusumaningrum, Nurcahyani Dewi Retnowati, Gabriel Naka Sorateleng
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1075

Abstract:
Increasing human productivity accompanied by increasingly advanced developments has an impact on the need for faster and easier communication and data exchange, one of which is using a mobile smartphone. ReResik application is an application that is used to report the accumulation of garbage. Garbage accumulation is a problem that is often encountered, one of which is in Gunungkidul tourism objects, so there needs to be a solution to solve this problem. One solution is to utilize Global Positioning System (GPS) and Firebase technology to create a waste reporting application. The use of GPS can make it easier to report the accumulation of garbage in a place by utilizing geo tagging technology and the complexity of the features found in Firebase provide user convenience both in terms of application development and the use of features in applications that can facilitate reporting and recipients of waste reports. All functions in the ReResik Application run according to design. Tests in the field can show the location of the accumulation of waste with photos sent with the difference in the accuracy of the location where the report of accumulation of waste occurs 1.38 meters from the location point sent by the application. The average data transfer capability of the ReResik Application upload is 1161.8 ms for the reporting section and 1004.2 ms for the cleaning staff. Functional testing of photos uploaded to Firebase has gone through the process of automatically compressing photos with an average value percentage of 61.22% of the uploaded photo size.
Wangi Pandan Sari
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1083

Abstract:
MEMS is an integrated electro-mechanical device which the technology has been applied to various applications, one of which is for the fabrication of microsensors, such accelerometers, microsensors for flow sensing, pressure sensing and mass sensing. In the MEMS implementation, there are several approaches and structures that can be used. This study designed a MEMS resonator mass sensor by the means of a mechanical resonator approach with free-free beam structure and actuated electrostatically. The design is expected to produce a MEMS based mass sensor with a high performance. Keywords Design; Mass sensor; MEMS; Free-free beam References J. W. Gardner, V. K. Varadan, and O. O. Awadelkarim, Microsensors, MEMS, and smart devices. John Wiley & Sons, Inc., 2003. Y. Development, "MEMS industry: the headwindsfrom COVID-19 and the way forward," ed, 2020. Z. Zhou, Z. Wang, and L. Lin, Microsystems and nanotechnology. Springer, 2012. B. E. DeMartini, J. F. Rhoads, M. A. Zielke, K. G. Owen, S. W. Shaw, and K. L. Turner, "A single input-single output coupled microresonator array for the detection and identification of multiple analytes," Applied Physics Letters, vol. 93, no. 5, p. 054102, 2008. Y. Kessler, S. Krylov, and A. Liberzon, "Flow sensing by buckling monitoring of electrothermally actuated double-clamped micro beams," Applied Physics Letters, vol. 109, no. 8, p. 083503, 2016. C. Zhao et al., "A resonant MEMS accelerometer with 56ng bias stability and 98ng/Hz 1/2 noise floor," Journal of Microelectromechanical Systems, vol. 28, no. 3, pp. 324-326, 2019. N. Li, C. Xing, P. Sun, and Z. Zhu, "Silicon-Glass-Silicon Triple Stacked Structure for Fabrication of MEMS Resonator Accelerometer," in 2019 20th International Conference on Electronic Packaging Technology (ICEPT), 2019: IEEE, pp. 1-4. H. Zhang et al., "A high-performance mode-localized accelerometer employing a quasi-rigid coupler," IEEE Electron Device Letters, vol. 41, no. 10, pp. 1560-1563, 2020. L. Xu, S. Wang, Z. Jiang, and X. Wei, "Programmable synchronization enhanced MEMS resonant accelerometer," Microsystems & Nanoengineering, vol. 6, no. 1, pp. 1-10, 2020. V. Kumar et al., "Bifurcation-based mass sensing using piezoelectrically-actuated microcantilevers," Applied Physics Letters, vol. 98, no. 15, p. 153510, 2011. J. Mouro, R. Pinto, P. Paoletti, and B. Tiribilli, "Microcantilever: Dynamical response for mass sensing and fluid characterization," Sensors, vol. 21, no. 1, p. 115, 2021. T. Rabenimanana, V. Walter, N. Kacem, P. L. Moal, and J. Lardiès, "Nonlinear analytical model of two weakly coupled mems cantilevers for mass sensing using electrostatic actuation," in Multidisciplinary Digital Publishing Institute Proceedings, 2018, vol. 2, no. 13, p. 1084. E. Martínez-Cisneros et al., "Analytical modeling of mechanical behavior for MEMS/NEMS-based single-clamped multilayer resonators with symmetrical complex shapes," Microsystem Technologies, vol. 27, no. 5, pp. 2167-2182, 2021. L. Li, Y.-p. Zhang, C.-c. Ma, C.-c. Liu, and B. Peng, "Anti-symmetric mode vibration of electrostatically actuated clamped–clamped microbeams for mass sensing," Micromachines, vol. 11, no. 1, p. 12, 2020. F. Nabki, T. A. Dusatko, and M. N. El-Gamal, "Microelectromechanical resonators for RF applications," in Wireless Technologies: CRC Press, 2017, pp. 589-628. H. Campanella, Acoustic wave and electromechanical resonators: concept to key applications. Artech House, 2010. V. K. Khanna, Nanosensors: physical, chemical, and biological. CRC Press, 2019. T. Zhang, "Electrostatic free-free beam microelectromechanical resonator," 2012. Z. J. Davis, W. Svendsen, and A. Boisen, "Design, fabrication and testing of a novel MEMS resonator for mass sensing applications," Microelectronic Engineering, vol. 84, no. 5-8, pp. 1601-1605, 2007. J. Wang, "Theoretical analysis and design of a double-clamped microchannel resonator," Massachusetts Institute of Technology, 2007. C.-C. Nguyen, "Micromechanical resonators for oscillators and filters," in 1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium, 1995, vol. 1: IEEE, pp. 489-499. K. Wang, A.-C. Wong, and C.-C. Nguyen, "VHF free-free beam high-Q micromechanical resonators," Journal of microelectromechanical systems, vol. 9, no. 3, pp. 347-360, 2000. M. U. Demirci and C.-C. Nguyen, "Higher-mode free-free beam micromechanical resonators," in IEEE International Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003, 2003: IEEE, pp. 810-818. http://dx.doi.org/10.28989/angkasa.v13i2.1083 Refbacks There are currently no refbacks.
Benedictus Mardwianta, Abdul Haris Subarjo, Dedet Hermawan Setiabudi, Munawar Husaini
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1091

Abstract:
Processing of waste biochar into briquettes as a substitute for biogas to support the roasting process of Arabica coffee processing is an alternative energy innovation as a substitute for conventional charcoal derived from wood and biogas from LPG as well as to support energy security. Briquette is a material that is strongly influenced by the nature and type of the materials that make it up. This study aims to determine the effect of the composition of briquettes with a mixture of coffee husk waste and sawdust on the calorific value, moisture content, ash content, and density test. The method used is experimental. In composition III the density value is the highest because the amount of sawdust is the most. because with the treatment of the compressive force manually, the charcoal particles will experience compression in accordance with the given compressive force. The results of the research on composition I yielded a calorific value of 6052 cal/gr, composition II yielded a calorific value of 6122 cal/gr and composition III yielded a calorific value of 6333 cal/gr. The results of the ash content test of SNI 01-6235-2000 regarding charcoal briquettes, the permissible ash content does not exceed the value of 8%. The ash content produced in composition III is according to the specified standard Keywords Biochar briquettes, Coffee husk, Wood powder, Calorific value References Nuriana, W., Suryanto, A., & Kamal, M., “Calorific value analysis, reduction of period weight, reaction rate, activation energy of old coconut, young coconut waste briquette burning, cocoa.” In IOP Conference Series: Materials Science and Engineering, Vol. 588, No. 1, p. 012004. IOP Publishing. 2019, August. Dewi, R., & Hasfita, F., “Pemanfaatan Limbah Kulit Jengkol (Pithecellobium Jiringa) Menjadi Bioarang Dengan Menggunakan Perekat Campuran Getah Sukun Dan Tepung Tapioka,” Jurnal Teknologi Kimia Unimal, 5(1), pp. 105-123, 2017. Anonim, “Sustainable Energy dan Upaya Ketahanan Energi Nasional,” diakses dari: https://kemlu.go.id/portal/id/read/171/halaman_list_lainnya/sustainable-energy-dan-upaya-ketahanan-energi-nasional, pada tanggal 11 november 2019 jam 07.00 wib, 2019. Caraka, R. E., “Simulasi Kalkulator Energi Baru Terbarukan (EBT) Guna Memenuhi Ketahanan Energi di Indonesia”, Statistika: Journal of Theoretical Statistics and Its Applications, 16(2), pp.77-88, 2016. Kurniawati, L., “Kebijakan Dana Ketahanan Energi Sebagai Upaya Mewujudkan Ketahanan Energi Sebagai Upaya Mewujudkan Ketahanan Energi Nasional: Konsep dan Tantangannya”, Jurnal Manajemen Keuangan Publik, 1(1), pp. 29-41, 2017. Subarjo, A. H., Mardwianta, B., & Wicaksono, A. B., “Efisiensi kompor surya parabola berreflektor cermin untuk menunjang ketahanan energi”, Jurnal surya energy, 4(1), pp. 345-352, 2020. Budiawan, Lucky dkk, “Pembuatan Dan Karakterisasi Briket Bioarang Dengan Variasi Komposisi Kulit Kopi”, Jurnal Bioproses Komoditas Tropis Vol. 2 No. 2 November 2015, hal 152-160, 2015,. Gunawan, Budi, “Pembuatan Biobriket Dari Limbah Bottom Ash PLTU Dengan Biomassa Cangkang Kopi”. Jurnal SIMETRIS, Vol. 6 No. 2, November 2015. Fitri, Nursyah, “Pembuatan Briket Dari Campuran Kulit Kopi (Coffea Arabica) Dan Serbuk Gergaji Dengan Menggunakan Getah Pinus (Pinus Merkusii) Sebagai Perekat”, Skripsi Jurusan Kimia Fakultas Sains dan Teknologi, 2015. Hilwatullisan, “Pemanffatan Limbah Kulit Kopi Dan Serbuk Gergaji Menjadi Briket Sebagai Sumber Energi Alternatif”. Jurnal KINETIKA, Vol. 6 No. 2, 2015. Masthura, M., “Analisis Fisis dan Laju Pembakaran Briket Bioarang Dari Bahan Pelepah Pisang”, Elkawnie: Journal of Islamic Science and Technology, 5(1), pp. 58-66, 2019. Setiawan, A., Andrio, O., & Coniwanti, P., “Pengaruh komposisi pembuatan biobriket dari campuran kulit kacang dan serbuk gergaji terhadap nilai pembakaran”, Jurnal Teknik Kimia, 18(2), 2012. Nasruddin & Affandy, Risman., “Karakteristik Briket dari Tongkol jagung Dengan Perekat Tetes Tebu dan Kanji”, Jurnal Dinamika Penelitian Industri., Vol. 22, No. 2 Tahun 2011. Hal : 1 – 10, 2011. Marchel, W. I., Freeke, P., & Dedie, T., “Analisis Perbedaan Jenis Bahan Dan Massa Pencetakan Briket Terhadap Karakteristik Pembakaran Briket Pada Kompor Biomassa”, In COCOS , Vol. 1, No. 5, 2019, September. Sinurat, Erikson, “Studi Pemanfaatan Briket Kulit Jambu Mete Dan Tongkol Jagung Sebagai Bahan Bakar Alternatif”, Tugas Akhir Jurusan Mesin Fakultas Teknik Universitas Hasanuddin, 2011. Radam, R. M., Lusyiani, L., Ulfah, D., Sari, N. M., & Violet, V., “Kualitas Briket Arang Dari Kulit Sabut Buah Nipah (Nypa fruticans WURMB) Dalam Menghasilkan Energi. The qualty of charcoal briquettes that made from nypah (nypa fruticans wurmb) outshel to product energy”, Jurnal Hutan Tropis, 6(1), pp. 52-62, 2018. Putri, R. E., & Andasuryani, A., “Studi mutu briket arang dengan bahan baku limbah biomassa”, Jurnal Teknologi Pertanian Andalas, 21(2), pp. 143-151, 2017. http://dx.doi.org/10.28989/angkasa.v13i2.1091 Refbacks There are currently no refbacks.
Paramitha Tedja Trisnaning, Fatimah Fatimah
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.944

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Bagian timur–selatan kaki Gunung Ungaran, Jawa Tengah dikenal sebagai daerah prospek panasbumi dengan manifestasi panasbumi matair hangat – panas. Masyarakat maupun pemerintah setempat, memanfaatkan manifestasi tersebut sebagai area wisata ataupun pemandian/kolam air panas yang dapat dijumpai di area wisata Candi Gedongsongo, Diwak, Derekan, Kaliulo, dan Banaran. Manifestasi matair panas muncul di permukaan dengan suhu dan karakteristik yang berbeda. Hal ini dimungkinkan karena adanya perbedaan tipe fluida hidrotermal, sehingga menarik dilakukan penentuan tipe fluida hidrotermal berdasarkan kandungan anionnya—Cl-, SO42-, dan HCO3-. Fluida hidrotermal muncul di permukaan sebagai air alkali klorida, air asam sulfat, air asam sulfat–klorida, dan air bikarbonat. Hasil analisis konsentrasi anion pada ke-lima lokasi, menunjukkan konsentrasi Cl- tertinggi ± 4.475 ppm dijumpai pada matair panas Diwak dengan konsentrasi HCO3- 127 – 500 ppm dan SO42- relatif rendah. Tipe fluida hidrotermal mataair panas Gedongsongo, Derekan, Kaliulo, dan mataair Banaran berupa Air Bikarbonat, serta mataair panas Diwak berupa Air Klorida. Keywords Ungaran; Diwak; fluida hidrotermal References Kusumadinata, K., Hadian, R., Hamidi, S.,and Reksowirogo, L. D., “Data dasar gunungapi Indonesia”, Direktorat Vulkanologi, Bandung, 820., 1979 M. Nukman, “Overview of Gedongsongo Manifestations of the Ungaran Geothermal Prospect, Central Java, Indonesia: a preliminary account”, Proc. 34 Workshop on Geothermal Reservoir Engineering, Stanford: Stanford University, 2009. T.L.R. Astuti dan Ev. Budiadi, “Geochemical of Soil at Gedongsongo Geothermal Prospect Area”, Pros. Seminar Nasional RETII XII, Yogyakarta: ITNY, 2017. Thanden, R. E., Sumadiredja, H., Richards, P. W., Sutisna, K., and Amin, T. C. ,”Peta Geologi Lembar Magelang dan Semarang, Jawa, skala 1: 100.000”, Pusat Penelitian dan Pengembangan Geologi, Bandung, 1996 K. Nicholson, “Geothermal Fluids Chemistry and Exploration Techniques”, Berlin: Springer, 1993. B. Setiawan and D. Purnomo, “Validasi Metode HPLC untuk Analisis Sulfit Pada Pembuatan Kandidat SRM NA2ZRO3”, Pros. Seminar Penelitian dan Pengelolaan Perangkat Nuklir, Yogyakarta: BATAN, 2012, hal 18 – 22. R.W. Van Bemmelen, “The Geology of Indonesia, Vol 1A, Netherland: Martinus Nijhoff, The Hague, 1949. Jenian Marin, “Studi Geomorfologi Gunung Api Dan Petrogenesa Batuan Untuk Memahami Evolusi Vulkanotektonik Pada Gunung Ungaran, Provinsi Jawa Tengah”, Proceeding, Seminar Nasional Kebumian Ke-8 Academia-Industry Linkage 15-16 OKTOBER 2015; GRHA SABHA PRAMANA. F. Fatimah, “ANALISIS POTENSI PANAS BUMI DENGAN METODE GEOMAGNET DI DAERAH GEDONG SONGO UNGARAN JAWA TENGAH,” Angkasa: Jurnal Ilmiah Bidang Teknologi, vol. 10, no. 1, p. 9, May 2018. Y. E. Sugiharto, “The Ungaran geothermal field,” Proc. Indon Petrol. Assoc., 31st Ann. Conv, 2007 http://dx.doi.org/10.28989/angkasa.v13i2.944 Refbacks There are currently no refbacks.
Dewi Eviane, Taufik Abdillah Natsir, Nur Iswanto, Zulfadly Urufi, Mardiyanto Adji
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.949

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Air pollution generated from airport activities has become public concern and the subject of more rigorous government regulations. The Airport Operators are stipulated to control the pollution and for the accountability of air quality that might affect public health. The main objective of this study is to establish a model for the distribution of air pollutants and to predict their concentrations generated by the runway and apron operations at Sam Ratulangi International Airport (Manado) until 2024, in accordance with the airport expansion program. The data was collected in the airport surrounding area in 2018, while the climate data over a span of 10 years, from 2009 to 2018, was obtained from Sam Ratulangi Meteorological Station. The modeling on dispersion of air pollutant gases was developed by the Gaussian Plume Equation. The simulation was performed using AERMOD software, and the results visualized by GIS software. AERMOD software was recommended by the US-EPA to predict the impact of air pollutants. The results predicted that the maximum concentrations of NOx; HC; and CO generated by runway activities modeling in 2024 were 250 μg.m-3; 6.4 μg.m-3; and 87 μg.m-3 respectively. The results also predicted that the maximum concentrations of NOx; CO; and PM10 due to apron operational activities in 2024 were 260 μg.m-3; 892 μg.m-3; and 2.5 μg.m-3 respectively. The model predicted that in 2024 the air pollution at Sam Ratulangi International Airport will remain under the limit as defined in Indonesian Government Regulation No. 22 of 2021. To mitigate the future increase in air emissions due to the increase in airport capacity, the recommendation were proposed in the several areas, which were including operation management, technology, policies and airport regulations, as well as the provision of green area.
Rony Arjuna, Joko Waluyo, Nur Aini Masruroh
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i1.954

Abstract:
Salah satu metode sand control yang umum digunakan oleh perusahaan oil dan gas untuk pekerjaan perawatan sumur adalah sand consolidation (SCON). Selama ini, proses pemilihan provider pelaksana pekerjaan dilakukan secara lelang. Kemudian pimpinan departemen dan engineer akan memutuskan providernya. Agar proses pemilihan lebih transparan, terukur dan bisa dipertanggung jawabkan, maka diperlukan suatu sistem pengambilan keputusan yang standar dan kompatibel. Penelitian ini bertujuan untuk mengetahui parameter apa yang menjadi dasar pertimbangan dan merancang sistem pengambilan keputusannya. Metode yang digunakan dalam penelitian ini adalah Analytical Hierarchy Process (AHP). Hasil dari penelitian ini menunjukkan kriteria yang dijadikan sebagai pertimbangan adalah compatibility (0,349), safety & environment (0,229), quality (0,219), cost (0,127), dan service (0,075). Alternatif ST-α2-HL dengan bobot 0,282 merupakan provider terpilih. AHP dapat diterapkan sebagai metode yang sangat baik dalam kasus penentuan best alternatif provider SCON. Perbandingan hasil antara decision maker dan metode AHP jika dilihat dari perspektif best alternatif saja mencapai 100%. Keywords Masalah kepasiran; Sand consolidation (SCON); Analytical Hierarchy Process References O. F. Maduabuchi, D. Appah, dan E. S. Okoro, “Relative Study of Internal Gravel Packing and Chemical Sand Consolidation: Sand Control Techniques of Niger Delta Wells,” Am. J. Eng. Res., vol. 6, no. 5, pp. 261–268, 2017. K. A. Zahroh, “Evaluasi Problem Kepasiran Pada Sumur – Sumur di Lapangan X,” Universitas Trisakti, 2016. O. Charles, U. Stephen, dan E. Onyekazi, “Comparative Study of The Sand Control Methods Used in the Oil Industry (Case Study of The Niger Delta),” Interational J. Sci. Eng. Res., vol. 7, no. 8, pp. 1497–1506, 2016. H. Taherdoost, “Decision Making Using the Analytic Hierarchy Process (AHP); A Step by Step Approach,” Int. J. Econ. Manag. Syst., vol. 2, pp. 244–246, 2017. A. Supriadi, A., dan Rustandi, Analytical Hierarchy Process (AHP) Teknik Penentuan Strategi Daya Saing Kerajinan Bordir. Tasikmalaya: Deepublish, 2016. B. Luzon, dan S. El Sayegh, “Evaluating supplier selection criteria for oil and gas projects in the UAE using AHP and Delphi, ” International Journal of Construction Management, vol. 16, pp. 175 - 183, 2016. C.N Wang, H.T Tsai, T.P. Ho, V.T. Nguyen, dan Y.F. Huang, "Multi-Criteria Decision Making (MCDM) Model for Supplier Evaluation and Selection for Oil Production Projects in Vietnam" Processes, vol. 8, no. 134, pp.1-13, 2020. C. Jack Kie, A. Khalif Hassan, N. Mohd Aripin, and R. Mohd Yunus, “An Analytic Hierarchy Process Approach in Decision-Making for Material Selection in an Automotive Company: A Case Study,” KnE Soc. Sci., vol. 2019, pp. 472–484, 2019. P. Z. Razi, N. I. Ramli, M. I. Ali, dan P. J. Ramadhansyah, “Selection of Contractor by Using Analytical Hierarchy Process (AHP),” IOP Conf. Ser. Mater. Sci. Eng., vol. 712, no. 1, 2020. R. S. Ilhami and D. Rimantho, “Penilaian Kinerja Karyawan dengan Metode AHP dan Rating Scale,” J. Optimasi Sist. Ind., vol. 16, no. 2, pp. 150-157, 2017. A. Siekelova, I. Podhorska, dan J.J. Imppola, “Analytic Hierarchy Process in Multiple Criteria Decision Making: A Model Example,” SHS Web of Conf., vol. 90, no. 01019, pp. 1-10, 2021. http://dx.doi.org/10.28989/angkasa.v13i1.954 Refbacks There are currently no refbacks.
Michael Hius Sentoso, Neno Ruseno
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i1.941

Abstract:
Flight planning is one of the essential factors of the airline operation. The selection of routes will determine the economic value of the flight. However, some conditions may prevent the flight to use the most optimum route due to airspace restriction or weather condition. The research aims to develop a search engine program that uses dynamic flight parameters that considers fusion of System Wide Information Management (SWIM) data including weather data and NOTAM to produce the most optimum route in 2D flight planning. The Dijkstra’s pathfinding is implemented in Python programming language to produce the flight plan. The navigation data used is enroute airway in Indonesian FIR regions. The scenario used is a flight from Jakarta to Makassar with duration of 2 hours flight with considering the effect of restricted airspace and weather blockage during in-flight. The study also uses the optimum route produced by the algorithm to be compared with the possible alternate routes to define how optimum the route is. Adding a restricted airspace parameter will result in a new optimum flight plan that able avoids the airspace and the most minimum distance. The effect of external wind parameter could influence the optimum route which may vary depends on the speed of the wind. Keywords flight planning, SWIM data, Dijkstra’s path finding, optimum route, restricted airspace. References D. Ferro, V. Roan, P. Haas, and F. Rollet, “Method and device for creating an aircraft flight plan.” Google Patents, 2015. M. J. Gibbs, D. Van Omen, M. B. Adams, K. L. Chase, D. E. Lewis, and D. E. McCrobie, “Method and system for entering data within a flight plan entry field.” Google Patents, 2005. F. Coulmeau, “Method of creating and updating an ATC flight plan in real time to take account of flight directives and implementation device.” Google Patents, 2014. L. Agam and D. Agam, “System for producing a flight plan.” Google Patents, 2009. H. Badli and R. Ghosh, “Method and system for managing flight plan data.” Google Patents, 2010. D. McNally et al., “Dynamic weather routes: two years of operational testing at American Airlines,” Air Traffic Control Q., vol. 23, no. 1, pp. 55–81, 2015. A. Klein, L. Cook, B. Wood, and D. Simenauer, “Airspace capacity estimation using flows and weather-impacted traffic index,” in 2008 Integrated Communications, Navigation and Surveillance Conference, 2008, pp. 1–12. W. Shijin, C. A. O. Xi, L. I. Haiyun, L. I. Qingyun, H. Xu, and W. Yanjun, “Air route network optimization in fragmented airspace based on cellular automata,” Chinese J. Aeronaut., vol. 30, no. 3, pp. 1184–1195, 2017. L. Wang, W. Wang, F. Wei, and Y. Hu, “Research on the Classification of Air Route Intersections in the Airspace of China,” Transp. Res. Rec., vol. 2673, no. 2, pp. 243–251, 2019. A. Akgunduz, B. Jaumard, and G. Moeini, “Deconflicted air-traffic planning with speed-dependent fuel-consumption formulation,” IEEE Trans. Intell. Transp. Syst., vol. 19, no. 6, pp. 1890–1901, 2017. A. Bombelli, L. Soler, E. Trumbauer, and K. D. Mease, “Strategic Air Traffic Planning with Fréchet distance aggregation and rerouting,” J. Guid. Control. Dyn., vol. 40, no. 5, pp. 1117–1129, 2017. C. Bongiorno, G. Gurtner, F. Lillo, R. N. Mantegna, and S. Miccichè, “Statistical characterization of deviations from planned flight trajectories in air traffic management,” J. Air Transp. Manag., vol. 58, pp. 152–163, 2017. M. Y. Pusadan, J. L. Buliali, and R. V. H. Ginardi, “K optima Clustering as Determination of Optimum Flight Route,” in 2018 International Conference on Computer Engineering, Network and Intelligent Multimedia (CENIM), 2018, pp. 299–304. M. Y. Pusadan, J. L. Buliali, and R. V. H. Ginardi, “Optimum partition in flight route anomaly detection,” Indones. J. Electr. Eng. Comput. Sci., vol. 14, no. 3, pp. 1315–1329, 2019. J. Kang, K. Choi, Y. Kim, and H. Yang, “A Method of Integrating Information for SWIM,” Proc. - 2017 IEEE 13th Int. Symp. Auton. Decentralized Syst. ISADS 2017, pp. 195–198, 2017, doi: 10.1109/ISADS.2017.30. S. Ayhan and P. Comitz, “Swim interoperability with flight object mediation service,” in 2009 IEEE/AIAA 28th Digital Avionics Systems Conference, 2009, pp. 6--D. B. Neumayr, E. Gringinger, C. G. Schuetz, M. Schrefl, S. Wilson, and A. Vennesland, “Semantic data containers for realizing the full potential of system wide information management,” AIAA/IEEE Digit. Avion. Syst. Conf. - Proc., vol. 2017-Septe, 2017, doi: 10.1109/DASC.2017.8102002. X. Lu and T. Koga, “SWIM concept-oriented information integration for air traffic surviellance,” in 2017 IEEE 6th Global Conference on Consumer Electronics (GCCE), 2017, pp. 1–2. J. C. H. Cheung, “Flight planning: node-based trajectory prediction and turbulence avoidance,” Meteorol. Appl., vol. 25, no. 1, pp. 78–85, 2018. ““Wayback Machine.” https://web.archive.org/web/20140725005129/http://www.boeing.com/assets/pdf/commercial/startup/pdf/737ng_perf.pdf (accessed Aug. 13, 2020). “Pertamina Aviation.” https://www.pertamina.com/aviation/News.aspx?p=price (accessed Aug. 14, 2020). Flightradar24, “Live Flight Tracker - Real-Time Flight Tracker Map.” https://www.flightradar24.com/data/flights/ga616 (accessed Aug. 14, 2020). http://dx.doi.org/10.28989/angkasa.v13i1.941 Refbacks There are currently no refbacks.
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