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All Journal International Journal of Electrical and Computer Engineering ASEAN Journal of Systems Engineering Majalah Forum Teknik UGM Atom Indonesia Journal Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Teknofisika JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN International Journal of Education, Science, Technology, and Engineering (IJESTE) Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal EBONI
Sihana Sihana
Faculty Of Engineering Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Identifikasi Sistem Governor Control Valve Dalam Menjaga Kestabilan Putaran Turbin Uap PLTP Wayang Windu Unit 1 Sri Sadono; Sihana Sihana; Nazrul Effendy
Teknofisika Vol 2, No 3 (2013)
Publisher : Departemen Teknik Nuklir & Teknik Fisika, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.62 KB)

Abstract

Salah satu komponen penting dalam sistem PLTP adalah sistem Governor Katup Kontrol.Pada sistem PLTP, katup kontrol digunakan untuk mengatur jumlah volume uap di dalam pipa sebelum menuju ke turbin uap. Untuk menentukan besar kecilnya bukaan katup, katup kontrol mendapatkan perintah dari suatu kontroler yang disebut governor. Turbin uap PLTP WW Unit 1 disetel agar selalu pada putaran 3000 rpm, untuk itu perlu dilakukan pengendalian katup kontrolagar aliran uap menuju turbin selalu stabil. Pada penelitian ini dibahas mengenai penyetelan ulang kontroler agar memiliki karakteristik respon sistem yang sesuai dengan tuntutan desain. Penyetelan ulang kontroler dilakukan dengan melakukan variasi autotune, yaitu metode Robust Response Time, Integral absolute Error (IAE), Integral Square Error (ISE), Integral Time Absolute Error (ITAE), danIntegral Time Square Error (ITSE). Dari berbagai metode yang diterapkan, terbukti bahwa penyetelan dengan metode ISE memiliki karakteristik yang paling baik dibandingkan dengan metode lain, yaitu menghasilkan kontroler jenis PI dengan Kp = 5 dan τi = 10 dengan karakteristik sistem overshoot = 8,29% , rise time = 0,0431 s , peak time = 0,153 s dan settling time = 1,04. Hal ini menunjukkan perubahan yang signifikan karena sistem sebelumnya memiliki %OS 41,7% dan settling time sebesar 1,63 s dan rise time sebesar 0,138 s.
HIGH THROUGHPUT STUDIES OF HYDROGEN EVOLUTION ELECTROCATALYST FOR WATER ELECTROLYSIS Radwinda Kurnia Putri; Brian Hayden; Agus Prasetya; Sihana -
ASEAN Journal of Systems Engineering Vol 1, No 2 (2013): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

This thesis presents a study of hydrogen evolution electrocatalyst for alkaline water electrolysis. Hydrogen production through the electrolysis of water requires the development of new electrocatalysts in order to reduce the hydrogen evolution over-potential of the cathode in order to make water electrolysis more competitive and efficient. An alternative approach in the optimisation of water splitting electrocatalyst may Be the modification of the metal electrocatalytic behaviour by supporting nano-particles on oxide support. Development of the electrocatalyst material for hydrogen evolution reaction in alkaline electrolyte may obtain more stable hydrogen evolution reaction.Pt on TiO2 electrocatalyst has been synthesized by applying high throughput Physical Vapor Deposition (HT PVD) method. Electrochemistry measurements of Pt on TiO2 have been used to study the characteristic and stability of the electrocatalyst for hydrogen evolution reaction in alkaline electrolyte for water electrolysis. XRD confirmed that the phase of TiO2 were amorphous and anatase after annealing for 6 hours at the temperature of 450oC. The thicknesses of TiO2 both for amorphous and anatase were 200 nm.Similar electrocatalytic behavior are presented both for Pt on amorpous TiO2 and Pt on anatase TiO2 from electrochemistry measurements using cyclic voltammetry and potential step on the 10 x 10 E-chem arrays in alkaline electrolyte (0.5 M NaOH). Higher currents are seen in the larger particle size of platinum in TiO2 both for amorphous and anatase phase. The hydrogen evolution reaction starts at the potential below -0.8 V vs RHE. The potential for hydrogen evolution reaction is shifted to the low potential. Larger particle size of platinum shows lower potential of hydrogen evolution reaction.Pt on TiO­2 tends to be a stable electrocatalyst for hydrogen evolution reaction in alkaline water electrolysis. It is because hydrogen evolution reaction occurs at low potential. Anatase phase of TiO­2 is more stable than amorphous TiO2, hence, Pt on anatase TiO­2­ could be better than Pt on amorphous TiO­2 for hydrogen evolution reaction in alkaline water electrolysis.
DESAIN SISTEM INSTRUMENTASI PROSES DISTILASI FRAKSINASI BATCH BERBASIS KENDALI SUHU Muhammad Arman; Agus Prasetya; Sihana -
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Distillation column is a column that is widely used in both large industry and small and medium industries. Use of distalasi column on small and medium industries such as the distillation of essential oils. In the subsequent use of the distillation column used for purification or further process to obtain a higher quality product in the form of multstage distillation. In the process of multistages distillation,  temperature is an important component in the process, because of that controls the temperature has an important role. Temperature controllers available today are manual, which causes frequent inaccuracy of the distillation process, resulting in low product quality. Therefore automatic temperature control is required.In this thesis, instrumentation system of fractionation distillation process based of temperature control are designed. The design process notice the six important  point temperature in the distillation process, using a thermocouple as a temperature sensor, and LM35 as the cold junction temperature,  the 6218 USB as Data Acquisition Board, and the software LABVIEW 2010.The instrumentation system programming, displays the temperature from time to time at intervals of one second, the temperature statistics (min, max and average) as well as measurement results table. The program also features a choice (shaped slider) to  set the temperature for a flexible batch process. The response characteristics of the instrumentation system is less than one second, both in displaying measured data, response indicator, display graphs, and data tables. The instrumentation system is also designed to regulate the flow rate of the cooling water and container replacement indicator for each product distillation.
Kebijakan Maintenance Berbasis Analisis Model Kerusakan Studi Kasus Pengoperasian & Pemeliharaan Turbin Uap di Pabrik Gula Saptiaji Harnowo; S Sunarno; S Sihana
Forum Teknik Vol 35, No 2 (2013)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Steam turbine in sugar plant already used as prime mover for exchanged the earlier model was steam engine. In fact, the operation of steam turbine in milling season many failures accured and have not been predicted before so that the system have low in operation.In this research, steam turbine would be analyzed their failure mode during milling season. The model has been constructed from many failure mode data operation and maintenance that was taken for 4 years (2006-2009). Weibull rank regression is used for this analysis, with the results of 2 (two) weibull parameter, consist of number shape parameter β=2.99, scale parameter η=1967.Interpreting number of those weibull parameter based on bath tub curve failure mdel, indicated that the steam turbine failure characterized as wear out model with failure rate increasing to mission time. Average life MTBF=82 days (no stop milling, 1 day=24 hours).To determine maintenance policy based on prediction component life with the result of speed controller (MTBF=984.6 hours), governor valve (MTBF=1649 hours), bearing turbine (MTBF=1892 hours), and lubrication turbine system (MTBF=1026 hours).With the MTBF life data, we can control the operation and maintenance steam turbine in sugar plant so minimize risk and failure during milling season. Keywords : failure, MTBF, milling, maintenance, weibull parameter
Simulation of Modified TRIGA-2000 with Plate-Type Fuel under LOFA Using EUREKA2/RR-Code S. Dibyo; K.S. Sudjatmi; S Sihana; Ign.D. Irianto
Atom Indonesia Vol 44, No 1 (2018): April 2018
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13.467 KB) | DOI: 10.17146/aij.2018.541

Abstract

The TRIGA-2000 research reactor in Bandung, Indonesia, has operated for over 50 years. Recently, the problem of fuel availability arises, since its fuel is no longer produced. A modification of reactor core with new plate-type fuel has been suggested. The study of the neutronic assessment of plate-type fuel elements reactor core had been done. The next assessment that needed to be done was thermal-hydraulic analysis. The purpose of this study is to simulate the thermal-hydraulic characteristics of major parameters, such as reactor power, fuel cladding temperature, and departure from nucleate boiling ratio (DNBR) due to LOFA transient, using EUREKA2/RR code. During steady-state condition, downward flow forced convection mode for core coolant system is operated. The upward flow occurs when the natural circulation mode takes place. Hottest core channels temperature during LOFA conditions was considered. The reactor core was modeled as three channels, i.e., the hottest channel, the average channel, and the channel for control assemblies, respectively. The simulation was based on the steady-state condition of 2 MWt reactor power, cooling mass flow rate of 63.5 kg/s,and inlet coolant temperature to the core of35.5°C. The result shows that the hottest fuel cladding temperature does not cause a nucleate boiling. During LOFA, the residual heat was removed by natural circulation flow that occurred slowly. In order to have larger inertia force, provision of the flywheel in the shaft of primary coolant pump is suggested.
Pengembangan Wisata Olahraga berbasis Camping untuk meningkatkan pendapatan Ekonomi Masyarakat Desa Pela Sihana; Irfan; Khairul Amar; Rabwan Satriawan; Sri Susanty
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 3 No. 2.1 Desember (2022): SPECIAL ISSUE
Publisher : Cv. Utility Project Solution

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Abstract

Pengembangan Wisata Olahraga Berbasis Camping merupakan upayakan agar dapat memberikan dampak posistif untuk meningkatkan pendapatan ekonomi masyarakat. Pengabdian ini bertujuan untuk mengetahui strategi pengembangan Wisata Olahraga berbasis Camping di Desa Pela Kecamata Monta Kabupaten Bima. Metode yang digunakan pada pengabdian ini menggunakan Analisi Manejemen Wisata Olahraga Desa (SIMWOD) diperkuat oleh Analisis SWOT untuk mengukur Kekuatan, Kelematan, Peluang dan Ancaman pengembangan wisata olahraga berbasis Camping untk meningkatkan pendapatan Ekonomi Maryarakat Desa Pela Kabupaten Bima. Berdasarkan hasil analisis tim pengabdian bahwa a) Potensi sumber daya alam yang telah dimiliki Objek Wisata Desa Pela dapat dimanfaatkan untuk mengembangkan berbagai macam aktivitas wisata alam, seperti camping, hiking dan Flying Fox, dll. Hal tersebut dapat meningkat ekonomi pendapatan masyarakat setempat. b) Mengadakan berbagai kegiatan sebagai media promosi mengenai objek wisata olahraga berbasis camping di Desa Pela Kabupaten Bima, termasuk dalam memasarkan potensi hebat yang dimiliki oleh masyarakat setempat, serta c) Mengoptimalkan peran kelompok sadar wisata (POKDARWIS) untuk bersama-sama meningkatkan tingkat kunjungan ke objek wisata disekitar Desa Pela Kabupaten Bima sehingga berdampat pada peningkatan ekonomi masyarakat.
Analisis Lingkungan Perancangan Pembangkit Listrik Siklus Organic Rankine pada Sumber Mata Air Panas Bumi di Limbong, Sulawesi Selatan Nurfadhilah Arif; Sihana Sihana; Rahmawan Budiarto; Andi Khairil A Samsu
Jurnal Eboni Vol 5 No 1 (2023): Juli
Publisher : Program Studi Kehutanan Universitas Muslim Maros

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46918/eboni.v5i1.1846

Abstract

Pemanfaatan tidak langsung panas bumi di Indonesia banyak digunakan sebagai pembangkit listrik. Mata air panas juga merupakan salah satu petunjuk adanya sumber daya panas bumi di bawah permukaan. Tujuan dari penelitian ini yaitu untuk menganalisis kondisi lingkungan dari rancangan pembangkit listrik yang menggunakan Siklus Organic Rankine pada mata air panas dari sistem panas bumi di lokasi penelitian. Sistem panas bumi yang ada di lokasi penelitian merupakan sistem panas bumi dengan suhu rendah sehingga digunakan siklus ini yang sesuai untuk diaplikasikan di lokasi penelitian. Daerah penelitian terletak di Limbong, Kabupaten Luwu Utara, Provinsi Sulawesi Selatan. Analisis lingkungan dilakukan dengan menghitung polusi panas dan emisi yang dihasilkan dari sistem ORC pada penelitian ini. Hasil penelitian ini menunjukkan polusi panas yang keluarkan oleh evaporator sebesar 57oC sedangkan di kondensor sebesar 10oC. Oleh karena itu, fluida yang dikeluarkan oleh evaporator masih melebihi ambang batas sehingga fluida panas tersebut perlu didinginkan terlebih dahulu sebelum diinjeksikan ke dalam bumi. Penelitian ini juga mengungkapkan bahwa Emisi CO2 dari mata air panas berasal dari adanya zat yang tidak terkondensasi (NCG) dalam uap air panas. Kandungan zat tersebut merupakan zat yang terbawa dari reservoir panas bumi dan/atau hasil alterasi batuan selama perjalanannya menuju permukaan bumi. Emisi yang dihasilkan dari hasil perhitungan sebesar 37750,69 kg/tahun dengan faktor emisi 0,2 kg/kWh. Nilai yang ditunjukkan oleh pembangkit listrik panas bumi sistem ORC dengan sumber panas dari mata air panas ini lebih ramah lingkungan setelah dibandingkan dengan emisi dari pembangkit listrik lainnya.
THE PIPE DIAMETER EFFECT ON HEAT TRANSFER OF HELICAL COIL HEAT EXCHANGER IN THE SOLAR WATER HEATER STORAGE TANK Mustikaningtyas, Andhita; Sihana, Sihana; Wijayanti, Ester; Riyandi, Naufal
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72714

Abstract

Solar thermal collectors are widely applied in various areas; one of them is solar water heating system. Inside the solar water heating system, there is a heat exchanger system located on thermal storage tank. It needs to develop the most efficient heat exchanger with some limited installation area. Helical coil heat exchanger is chosen as an alternative for saving the installation space by the coil helix geometry. The main difference between the helical heat exchanger and shell and tube heat exchanger is the geometry. This geometry causes differences in heat transfer process, as a result of the secondary flow in the fluid. This study analyzed the effect of the pipe diameter variance to heat transfer of helical coil heat exchanger, applied to solar water heating systems, performed by using three helical coils with pipe diameters variation, with an outer diameter of 6.4; 4.9; 2.95 mm. The heat transfer performance was analyzed by dimensionless number relationship with Wilson Plot technique. The experiment showed that, the performance of helical coil heat exchanger is better at bigger diameter. Forced convection inside the pipe obeyed Nui=ci.Re^0.7 with various  ci  number. The values of  ci  are bigger at bigger pipe diameter and higher hot water temperature.
Design of a thermionic electron gun of 6 MeV linac by using neural network based surrogate model Nuraini, Elin; Sihana, Sihana; Taufik, Taufik; Darsono, Darsono; Saefurrochman, Saefurrochman; Utama, Rajendra Satriya
International Journal of Electrical and Computer Engineering (IJECE) Vol 16, No 1: February 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v16i1.pp477-487

Abstract

High performance electron guns are fundamental components in linear accelerators (linacs), directly influencing beam quality and downstream system efficiency. However, designing electron guns for applications such as a 6 MeV linac presents complex trade-offs between current, perveance, and beam emittance. Traditional simulation-driven optimization methods are computationally expensive and limit rapid prototyping. In this study, we develop a neural network-based surrogate model trained on CST Studio Suite simulation data to predict the electron gun's performance metrics. Our approach significantly accelerates the optimization process by providing real-time predictions of beam current and perveance across a wide design parameter space. The surrogate model achieves high prediction accuracy, with training and validation losses on the order of 10⁻⁷. Results demonstrate that neural network models can serve as reliable and efficient tools for electron gun design, offering considerable computational savings while maintaining accuracy. Future extensions include expanding the surrogate model to multi-objective optimization and incorporating thermal and mechanical effects into the design process.
Co-Authors A. Hadiwinata Agus Prasetya Agustina Mega Ahmad Agus Setiawan Ahmad Agus Setiawan Andang Widi Harto Andang Widi Harto Andang Widiharto Andang Widiharto Andang Widiharto Andang Widiharto Andang Widiharto Andang Widiharto Andi Khairil A.Samsu Anwar Ramadhan Ritonga Arif, Nurfadhilah Barlian Gumay Limbaran Brian Hayden Cahyo Ridho Prabudi Darsono Darsono Dion Bagus Nugraha B Elin Nuraini Ester Wijayanti Faridah Faridah Faridah Faridah Fredrick Neo Hay's, Riyan Naufal Ign.D. Irianto Iqbal Syafin Noha irfan irfan Izzad Abidiy K.S. Sudjatmi Khairul Amar Kutut Suryopratomo Kutut Suryopratomo M. Makrus Imron M. Rizaal Muhammad Agha Muhammad Arman Mustikaningtyas, Andhita Nazrul Effendy Rabwan Satriawan Radwinda Kurnia Putri Rahmawan Budiarto Roni Eka Arrohman S Sunarno S. Dibyo Saefurrochman Saefurrochman Saptiaji Harnowo Sri Sadono Susanty, Sri Taufik Taufik Utama, Rajendra Satriya