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All Journal Rotasi SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Sinergi Jurnal Teknik Mesin Jurnal Engine: Energi, Manufaktur, dan Material Quantum Teknika Jurnal Pengabdian Masyarakat Bhinneka
Anggara, Fajar
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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SIMULASI NUMERIK PROSES PELELEHAN PARAFFIN WAX PADA UNIT PENYIMPAN ENERGI TERMAL TIPE PIPA GANDA KONSENTRIK Suhanan, Suhanan; Nadjib, Muhammad; Ansyah, Pathur Razi; Anggara, Fajar
ROTASI Vol 19, No 1 (2017): VOLUME 19, NOMOR 1, JANUARI 2017
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.974 KB) | DOI: 10.14710/rotasi.19.1.36-44

Abstract

Phase change material (PCM) dikenal memiliki densitas energi yang lebih tinggi dibandingkan dengan material penyimpan kalor sensibel. Oleh karena itu, PCM menarik diaplikasikan pada pemanas air tenaga surya (PATS) yang umumnya menggunakan air sebagai penyimpan energi termal. Penelitian terakhir untuk sistem PATS thermosyphon belum dapat mengidentifikasi perilaku termal PCM pada arah radial dan aksial. Selain itu, tidak diketahui temperatur PCM saat terjadi pelelehan karena sumber kalornya berfluktuasi. Penelitian ini bertujuan untuk menyelidiki perilaku termal proses pelelehan paraffin wax secara numerik di dalam pipa ganda konsentrik dengan sumber kalor yang konstan. Simulasi numerik dilakukan pada penyimpanan energi termal berbentuk pipa ganda konsentrik. Paraffin wax dimasukkan pada pipa bagian dalam sedangkan air sebagai heat transfer fluid (HTF) dialirkan di bagian annulus. Termokopel dipasang di beberapa tempat baik sisi HTF maupun sisi PCM. Software yang dipakai adalah ANSYS FLUENT 17. Proses simulasi dilakukan dengan membuat meshing, menginput persamaan dan kondisi batasnya, setting penghitungan jumlah iterasi serta batas konvergensi dan dilanjutkan dengan pengambilan data temperatur selama proses charging. Simulasi menggunakan variasi temperatur HTF input dan laju aliran massanya. Hasil simulasi menunjukkan bahwa proses pelelehan PCM tidak terjadi secara isotermal. Transfer kalor ke PCM saat awal charging terjadi secara konduksi dan berlangsung cepat yang diakibatkan oleh besarnya gradien temperatur di arah radial pada fasa padat. Pembentukan fraksi cairan di sepanjang sisi luar PCM terjadi sejak awal proses charging. Bilangan Stefan mempunyai pengaruh yang besar terhadap proses pelelehan PCM.
Sistem Akuisisi Data Mesin Uji Puntir Berbasis Arduino Uno dan Microsoft Visual C# Kurniawan, Faizal; Anggara, Fajar
ROTASI Vol 22, No 3 (2020): VOLUME 22, NOMOR 3, JULI 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.3.%p

Abstract

Pengujian mekanik material pada baja sangat dibutuhkan di industri untuk mengetahui spesifikasi dan  sifat dari baja yang digunakan. Salah satu pengujian untuk mengetahui sifat mekanik dan karakteristik dari material yaitu dengan menggunakan metode pengujian puntir. Supaya mendapatkan data pengujian puntir yang akurat dan presisi maka diperlukan suatu sistem akuisisi data untuk merekam dan mencatat datanya. Dalam penelitian ini, sistem akuisisi data dibuat menggunakan perangkat lunak  yang dapat menampilkan secara realtime grafik data tegangan geser, regangan geser, torsi, serta sudut puntirnya. Masukan dari sistem akuisisi data ini menggunakan sensor load cell dan rotary encoder yang akan mencatat berat dan sudut putarnya. Sensor tersebut akan dikalibrasi untuk mengetahui nilai kepresisian dari penggunaannya. Data yang didapat oleh sensor selanjutnya diproses dengan menggunakan mikrokontroler Arduino Uno R3 dan diolah pada Microsoft Visual C# untuk ditampilkan datanya, output data pada perangkat lunak disimpan dengan format *.csv dan *.png. Hasil pengujian kalibrasi menunjukan bahwa sistem akuisisi data uji puntir ini memiliki ketelitian pembacaan rotary encoder sebesar 0,15˚ dengan fungsi persamaan y = 0,15x dan ketelitian pembacaan load cell sebesar 0,002 kg atau 2 g, dengan fungsi persamaan y = 10,426x - 0,0011 dengan tingkat keyakinan 99,97%. Pengujian puntir spesimen dengan perangkat lunak ini dilakukan pada material ST37 dengan dimensi yang sama dan spesimen yang diuji berjumlah 3 pcs menghasilkan trendline grafik data yang stabil.
Validasi Nilai Simulasi Faktor Keamanan Pada Putaran Kritis Poros ST41 Anggara, Fajar
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 2, No 1 (2020): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.020120

Abstract

A Shaft has been widely used in machinery construction, transmitting power from one component to another. Firstly, the shaft must be calculated for its safety factor before being used for the actual application. In this study, the specimen used for testing was ST 41 material. The safety factor is essential for engineering design, used to evaluate that machine elements' system is guaranteed safety with minimal dimensions. The way to nd the safety factor of this test tool is to use actual calculations and simulations on the Solidworks software. The value of the safety factor obtained from the calculation will be compared with SolidWorks software's simulation results. The results obtained in a calculation analysis for the actual stress of 6,65x106 N/m2 and the safety factor of 55, while for the actual stress (von Mises) in a simulation of 6,8x106 N/m2 and its safety factor of 54. After validating the data, there is a difference of 1.1% for the actual stress and 0.9% for the value of its safety factor.
Delta EC Simulation on Influence of Resonator Length in Close-Open Standing Wave Thermoacoustic Engine Anugrah, Rinasa Agistya; Wisnujati, Andika; Anggara, Fajar
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 7 No. 2 (2023)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v7i2.1501

Abstract

Many applications of thermoacoustic engines in engineering. With its pressure of it, the energy can be harvested and can be converted to many other needs of energies like electrical energy. Energy in thermal form is converted to become acoustic energy and subsequently used to activate a bidirectional turbine. The resonator is very influential toward the power of the thermoacoustic engines. Simulation study with Delta EC fit to make predictions acoustic power as representative performance in thermoacoustic engine with close-open type and standing wave of oscillation. In this study, the material of the resonator is made from a stainless-steel duct with a diameter size of 50.8 mm with three variations of the length. The Standing-Wave Thermoacoustic Engine (SWTE) generates acoustic energy from a temperature gradient of 315 – 993 K. In this simulation, Acoustic Power decreased when the resonator length was extended. The shortest resonator had an acoustic power of 50.4 W, and the longest resonator had an acoustic power of 35.7 W.
Intelligent system design for identification of unbalance and misalignment using Fuzzy Logic methods Romahadi, Dedik; Feriyanto, Dafit; Anggara, Fajar; Wijaya, Fathoni Putra; Dong, Wang
SINERGI Vol 28, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.2.004

Abstract

Vibration analysis identifies emerging vibration problems before they become unmanageable and cause unforeseen delays. This can be accomplished by monitoring engine vibration continuously or at specific intervals. Unbalance is a common vibration issue caused by the center of mass shifting from the center of rotation, leading to misalignment and excessive vibration between shafts. To prevent this, manual monitoring is required, but it is time-consuming. Therefore, intelligent system monitoring is necessary to save time. Using a large amount of vibration, spectrum, and phase data as input, this project aims to develop a diagnostic application for motor problems based on vibration signals. Fuzzy logic is implemented in MATLAB software to process a considerable amount of input data for all vibrations, spectrums, and phases using the fuzzy logic method. A vibration meter is used to collect vibration data from the demonstration machine. All input data will be processed by the fuzzy system based on predefined fuzzy rules that must provide accurate results for the actual operating conditions of the demonstration machine. Conducting experiments will help the intelligent system correctly detect damage from misalignment and imbalance. The intelligent fuzzy logic system can accurately diagnose damage caused by misalignment and unbalance on the demonstration machine.
STUDY AND DESIGN OF STREET LIGHTING SYSTEMS USING SOLAR PANEL Anggara, Fajar; Carles, Henry; Oktaviani, Vira
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i3.29990

Abstract

Due to scarcity of fossil fuel, alternative energy has been used upon renewable energy. This research discussed about street lighting plan at PT. Haraka Erfi Kosmetindo Abadi which used solar panels as an alternative energy. The study aims to determine design the capacity of solar panels, batteries and inverters to meet the needs of road lights. The results show that 7 solar panels of 100 Wp are needed, along with 3 units of batteries with a capacity of 100 Ah, 1 unit of PWM type Solar Charge Controller with a capacity of 60 A, and 1 unit of Modified Sine Wave type inverter with a capacity of 500 W. Furthermore, an efficiency of 14.37% was obtained from this system.
INVESTIGASI RASIO PANJANG INLET GUIDE VANE DAN DUCTING DENGAN ANALISA NUMERIK TERHADAP POLA ALIRAN DAN KECEPATAN KELUARAN OUTLET DUCTING anggara, fajar
Jurnal Teknik Mesin ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ(Journal Of Mechanical Engineering) Vol 9, No 2 (2020)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v9i2.7905

Abstract

In this research, air flowing from condenser of cold room has been used to turning turbine through ducting. In term of installation the guide vane in the ducting, air flowing is directed to turbine blade. This investigation using ANSYS FLUENT 17 to determine the dimension ratio of length between guide vane and ducting. By comparing three variations A, B and C that the best ratio is B by producing 9.2-9.4 m/s at the outlet of ducting. This is due to the degree of the guide van B is smaller than A and the distance to increase velocity is longer than guide vane C.
Numerical Study the Effect of Blade Number on Archimedes Screw Turbine Utilized in Pico-Hydro in Horizontal Position anggara, fajar
Jurnal Teknik Mesin ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ(Journal Of Mechanical Engineering) Vol 10, No 2 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v10i2.11505

Abstract

Application of Archimedes Screw Turbine (AST) on pico-hydro has been very popular due to its capability to has a high torque with small flow rate and environmentally friendly to biotic of vicinity. This study uses CFD to investigate AST performance when the number of blades is varied. Independency of mesh is conducted to find an efficient number of mesh and it is obtained at 80 thousand mesh. Variation A, B and C respectively has 4,6, and 9 blades varied to analyze the correspondence with torque, pressure loss and velocity contour. The results show that with a higher number of blades would make higher torque. This is because energy extraction from water would be more efficient at higher number blade. However, the side back at such number would arise such as the higher-pressure loss. This is corresponding to energy balance where a high delta pressure is proportional with a generated energy turbine. 
NUMERICAL STUDY OF COMPARISON THE EFFECT OF FRICTION AND RESTITUTION COEFFICIENT ON SEPARATION EFFICIENCY OF CYCLONE Anggara, Fajar
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 14 No. 2 (2020): SINTEK JURNAL
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.14.2.80-84

Abstract

Numerical modeling of cyclone on separation process was developed to increase the efficiency of collection. In terms of increasing the accuracy, this researsh was conducted to observe comparison in between the effect of coefficient of friction (COF) and restitution (COR) on the effeciency of colection. This reseacrh was using ANSYS 17 to simulate cyclone in 3D geometry. Where the variation of COR was 0,0.5 and 1 while the COF was 0,10,20 and 120. The result shows COR has not correspondence to the efficiency of collection but COF has inverse correspondence. Hence, the more friction on the cyclone surface, the more resistant sand particle to go down.
Pelatihan Pengoperasian Mesin Pengurai Sabut Kelapa Di RPTRA Menara Kelurahaan Kembangan Selatan Jakarta Barat Subekti, Subekti; Indah, Nur; Pratiwi, Swandya Eka; Wahyudi, Haris; Anggara, Fajar; Sudarma, Andi Firdaus; Carles, Henry; Sari, Andarany Kartka; Suprihatiningsih, Wiwit
Jurnal Pengabdian Masyarakat Bhinneka Vol. 3 No. 4 (2025): Bulan Juli
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v3i4.250

Abstract

\ Proses pengolahan limbah sabut kelapa dengan menggunakan mesin pengurai sabut kelapa dapat memudahkan proses produksi. Hasil produksi dari penguraian sabut menghasilkan cocofiber dan cocofeat yang dapat di manfaatkan dalam berbagai macam produk seperti jok mobil, matras, keset, kerajinan tangan, papan serat, serta produk ramah lingkugan lainnya. Hal tersebut menunjukkan bahwa penggunaan produk-produk rumahan tidak hanya berasal dari bahan baku sintetis. Pemanfaatan sabut kelapa dengan sumber bahan baku yang relatif mudah didapatkan dapat membantu perindustrian ekonomi kecil dan menengah, dengan demikian pengabdian masyarakat melalui merancang mesin pengurai sabut kelapa menggunkan motor bakar bensin sebagai penggerak mesin untuk mempermudah proses penguraian sabut kelapa sebelum diproduksi. Sehingga tujuan pengabdian masyarakat dalam menanfaatkan limbah serabut kelapa menjadi barang dapat bernilai ekonomis sehingga dapat meningkatkan taraf hidup masyarakat sekitar. Kegiatan ini dilakukan dengan ceramah dan demo mesin pengurai sabut kelapa. Masyarakat yang akan terlibat dari kegiatan ini sekitar 40 orang yang diatur oleh RT/RW setempat, Kegiatan ini sangat diapresiasi oleh para peserta dimana hampir 88 % peserta memahami isi materi dan praktek Mesin Serabut Kelapa. Sedangkan untuk nilai terendah sekitar 72 % menyatakan bahwa kegiatan ini sangat diperlukan oleh para peserta dan berlangsung sukses dengan banyaknya pertanyaan dan saran agar kegiatan ini dilanjutkan.
Co-Authors Andi Firdaus Sudarma Anugrah, Rinasa Agistya Carles, Henry Dafit Feriyanto Muhammad Nadjib, Muhammad Nur Indah, Nur Oktaviani, Vira Pathur Razi Ansyah Romahadi, Dedik Sari, Andarany Kartka Subekti Subekti Sudarma, Andi Firdaus Suhanan Suhanan, Suhanan Swandya Eka Pratiwi, Swandya Eka Ujang Sumarwan Wahyudi, Haris Wang Dong Wijaya, Fathoni Putra Wisnujati, Andika Wiwit Suprihatiningsih Xiong, Hui