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All Journal Rotasi Sinergi World Chemical Engineering Journal Jurnal Teknik Mesin Industri Inovatif : Jurnal Teknik Industri International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) Jurnal Pengabdian Masyarakat Bhinneka International Journal of Innovation in Mechanical Engineering and Advanced Materials Aceh International Journal of Science and Technology
Andi Firdaus Sudarma
Universitas Mercu Buana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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Studi Numerik Pengaruh Geometri Supply Air Grille serta Variasi Kecepatan Udara Masuk Terhadap Distribusi Temperatur di Dalam Ruangan Terkondisi Sudarma, Andi Firdaus; Widianto, Fajar
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 10, No 1 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v10i1.10096

Abstract

– Sistem pengkondisian udara adalah fasilitas utama untuk menciptakan kenyamanan termal pada suatu ruangan. SAG memegang peranan penting dalam mengatur penyebaran udara. Dalam penelitian ini dua buah tipe SAG dengan geometri berbentuk linear dan square diteliti secara numerik. Kecepatan aliran masuk divariasikan pada besaran 1,6, 3,1 dan 4,6 m/s dipelajari untuk mengetahui pengaruhnya terhadap distribusi temperatur. Hasil dari simulasi ditampilkan dalam bentuk kontur temperatur pada bidang horizontal dan gradien temperatur pada posisi vertikal. Analisis dilakukan terhadap hasil untuk mengetahui distribusi temperatur dan besaran temperatur rata-rata guna terciptanya kenyamanan termal. Hasil simulasi menunjukkan bahwa SAG tipe square mampu mendistribusi temperatur lebih merata dibandingkan tipe linear. Hasil lainnya juga memperlihatkan bahwa kenyamanan diraih oleh tipe square pada laju aliran yang lebih rendah dibandingkan dengan tipe linear.
Performance Analysis of R600a as a Replacement for R134a in a Household Refrigeration System Sudarma, Andi Firdaus; Carles, Henry; Azhar, Azmi; Akmal, Muhammad; Sirait, Alfa Firdaus
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 14, No 2 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v14i2.32326

Abstract

This study evaluates the performance of a 50-liter mini refrigerator using R600a as an alternative to the factory-default refrigerant, R134a. The experimental setup included pressure gauges and digital thermometers to measure key parameters such as temperature and pressure at critical points in the refrigeration cycle. Tests were conducted under two scenarios: no-load and a 4 kg chicken meat load. Initially, the system operated with R134a at 16 bar and 20 g charge before being evacuated and recharged with R600a at the same pressure. Data was collected over a 10-minute period under stable conditions and analyzed using a P-h (Pressure-Enthalpy) diagram to determine enthalpy, refrigeration effect, compressor work, and coefficient of performance (COP). The effect of using R600a, efficiency increased 4% without load and 7% with load operation compared to R134a system. While COP actual has increased 5% and 10% respectively. The results indicate that R600a offers comparable performance to R134a while presenting potential advantages in terms of energy efficiency and environmental impact. These findings contribute to the ongoing evaluation of R600a as a sustainable replacement for R134a in household refrigeration applications.
STUDY OF FINITE DIFFERENCE METHOD IN HEAT FLOW SIMULATION OF TWO-CHAMBER THERMOS SEPARATOR MADE OF POLYPROPYLENE USING MATLAB APPLICATIONS Pandriana, Aap; Pudjiwati, Sri; Alva, Sagir; Tarigan, Kontan; Sudarma, Andi Firdaus; Khaerudini, Deni Shidqi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i2.27803

Abstract

Heat transfer can be defined as transfer of energy from one area to another as a result of temperature differences in objects. This indicates heat transfer not only explains how heat energy is transferred from one object to another, but can also predict the rate of heat transfer that occurs under certain conditions. In this case, what is related to the heat flow model equation is two-chamber thermos separator where the separator is made of polypropylene. This separator functions to prevent the flow of heat from one side to the other side of the thermos tube. Polypropylene is included in the insulator category, although heat transfer still occurs. The heat transfer will be calculated using the finite difference method in parabolic partial differential equations using the Matlab application. The heat transfer process is assumed to occur by conduction, with a separator length of 1 cm. Assume the first side of the divider has a right temperature of 100°c, and the other side 20°c. The temperature point measured on the separator is located in the center of the separator. After completing the solution using the Matlab application with the finite difference method, a heat transfer flow simulation was obtained in the two-chamber thermos separator which shows the heat flow transfer at any time. At 0.1 seconds the temperature at T1 is 2.4°c, while at 10 seconds  is 65.9704°c. Then at 0.1 seconds the temperature at T4 is 0.48°c, while at 10 seconds 19.5436°c. The conclusion is in the separator of the two-chamber thermos there is significant heat flow from the side of the first tube to the other side.
STUDY OF THE NEWTON RAPHSON METHOD IN ANALYZING THE DEPTH OF FLUID FLOW IN THE WASTEWATER CANAL U RPS TKRO SMKN 1 CIRUAS USING THE MATLAB APPLICATION Susilo, R Dwi Pudji; Tarigan, Kontan; Sudarma, Andi Firdaus; Oktaviani, Ana Nur; Khaerudini, Deni Shidqi; Fitri, Muhamad
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i2.27624

Abstract

Abstract--Flow Depth can be defined as channel height or open channel flow depth, is an important parameter in hydraulic calculations and analysis. The depth of flow in the U channel (U channel) of the Student Practice Room (RPS) for Automotive Light Vehicle Engineering (TKRO) at SMKN 1 Ciruas often causes delayed flow congestion and full channels. Sometimes it is dry if only a few students carry out practical use of room practice and use of water and other waste. The aim of this research is to find a solution to this problem, namely by knowing the depth of flow in the channel so that in the future when designing waste water drainage channels it can be designed appropriately and in accordance with the volume of waste released. The method is to calculate the flow depth in the U channel using NEWTON RAPHSON numerical analysis and the Matlab application to determine the flow depth. The calculation result is the depth of water flow in channel U, with water flow discharge Q = 0.016 m3/s, Manning coefficient for roughness of channel walls and base n = 0.025, slope of channel bottom I = 0.003, and width of channel U B = 0.22 m, at The 11th and 12th iterations flow depth = 0.194864 m. The results of manual exact calculations in the 11th and 12th iterations, the error percentage is 0%, meaning that the flow depth is uniform at a water level of 0.194864 m. Calculations using the Matlab application obtained graphs and the iteration steps were slightly different in the 12th and 13th iterations, the flow depth results were the same = 0.194864 m. The initial guess at flow depth(h)=1, the percentage error is 25%, the uniform flow depth of the RPS TKRO SMKN 1 Ciruas U channel is 0.194864 m.Keywords : Depth of flow, NEWTON RAPHSON, Open Channel, U Channel, MATLAB
Characterization of Natural Fiber Reinforced Resin Composites and Glass Waste Powder for Brake Linings Fitri, Muhamad; Sudarma, Andi Firdaus
Aceh International Journal of Science and Technology Vol 14, No 1 (2025): April 2025
Publisher : Graduate School of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.14.1.42585

Abstract

Currently, there are two types of brake linings in the market: asbestos brake lining and asbestos-free brake linings. The asbestos Brake lining was widely used due to durability, heat resistance and friction properties. In terms of price, asbestos brake linings are indeed cheaper than asbestos-free brake linings, However, they have negative impact on the environment and human health. In high enough concentrations, asbestos dust can cause Mesothelioma, a malignant tumor in the lining of the lungs). Therefore, it is necessary to find a substitute material for asbestos that is affordable but possesses similar characteristics to asbestos brake linings. While, the high production of salak in Indonesia has a side effect, i.e.: the large volume of waste in the form of peel and seeds of salak. If not utilized, of course this will become waste. Meanwhile, glass waste is an inorganic waste material that is very difficult to decompose and pollutes the environment. Meanwhile, glass waste is one of the inorganic waste materials that is very difficult to decompose and pollutes the environment. The aim of this study was to characterize composite resin materials reinforced with glass waste powder, Snake Fruit Peel Powder and teak wood sawdust as alternative brake lining materialsThe research was conducted through laboratory experiments, beginning with the manufacture of sample specimens, followed by measuring their density, hardness, and friction coefficient testing then compared to brake lining on the market and also based on the SNI 09-0143-1987 standard. The result showed, some of the investigated samples in this study meet the reqirement of SNI 09-143-1987, where the lowest Brinell Hardness number of the sample 120.33. There are 5 specimens of friction coefficient of the specimens are also fullfill the requirement.
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.
Heat Distribution Simulation in a Square Aluminum 7075 Plate Using Laplace Equation and MATLAB Sri Pudjiwati; Andi Firdaus Sudarma; Kontan Tarigan; Deni Shidqi Khaerudini; Eldwin Djajadiwinata
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 6 No. 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i2.25356

Abstract

The efficient management of heat transfer from aircraft engines to the wings is vital for maintaining thermal efficiency and structural integrity in modern aircraft design. Excessive heating of the wings, caused by engine-generated heat, can negatively impact aerodynamic performance and safety. This study focuses on analyzing heat distribution in a square aluminum 7075 plate to better understand heat transfer mechanisms. Using the Laplace equation, implemented through MATLAB (2023 Online Version), we aim to simulate and analyze heat distribution on the plate. The numerical method employed in this research involves solving the Laplace equation with Neumann boundary conditions, which represent insulated edges. The Liebmann method is used to iteratively reduce error to less than 1%. Simulations are conducted on an aluminum 7075 plate of dimensions 4x10⁻² m x 4x10⁻² m under various temperature conditions at the edges. Numerical results show that at the 9th iteration, the error reaches 0.71%, while MATLAB simulations yield an error of 0.4681% at the same iteration. The heat distribution across the plate is clearly visualized, and the analysis indicates that increasing the number of grids improves both the clarity and accuracy of the simulation results. In conclusion, this study demonstrates that applying the Laplace equation via MATLAB is an effective approach for analyzing heat distribution in aluminum 7075 plates. The results show that a finer grid resolution enhances accuracy, with a 101-grid system providing particularly clear and precise heat distribution patterns. These findings contribute to the optimization of thermal system designs, especially in aviation-related applications.
NiO ELECTRO-DEPOSITION TECHNIQUE OF γ-Al2O3 WASHCOAT ON FeCrAl SUBSTRATE BY USING SULPHAMATE TYPE SOLUTION Dafit Feriyanto; A. M. Leman; Andi Firdaus Sudarma; Dedik Romahadi; Hadi Pranoto
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 4 No. 1 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v4i1.15763

Abstract

Electro-deposition process to develop surface layer on the substrate material in Catalytic converter (CATCO) become interesting area due to that process was purposed to improve the physical properties of substrate material. Currently, precious metals such as Platinum (Pt), Palladium (Pd), and Rodium (Rd) were used due to excellent oxidation resistant but it limited and easily oxidized. Therefore, Nickel Oxide (NiO) catalyst used as electro-deposition material. NiO electro-deposition technique that called by EL was conducted by using NiO as cathode and FeCrAl as substrate and -Al2O3 as washcoat material. This technique was performed by  variation times of 15, 30, 45, 60 and 75 minutes, current density of 8 A/dm2. The results shows that Coating layer of NiO and  -Al2O3 has been developed on surface of FeCrAl substrate. The coating layer was increase the surface roughness which showed by surface morphology data that coated FeCrAl substrate has uneven surface and some particles has been embedded on that surface. The composition of raw material was consists of Fe for 74.13wt%,  Cr of 20.25 wt% and Al of 5.62 wt%. Meanwhile, for composition of EL samples was 52.56- 63.54wt% for Fe element, Al for 3.56-11.89 wt%, Cr for 14.97-18.56 wt%, O for 2.47-11.78 wt%, C for 8.33-11.85 wt%, Na for 0.11-0.48 wt%  and Ni for 0.17- 1.58 wt%.  Higher elements of the EL samples potential to improve the thermal stability at high temperature due to CATCO operate at high temperature of 600-8500C and in extreme condition.
Pengolahan Sampah Organik Menjadi Pupuk Cair Menggunakan Biokomposter di Pondok Pesantren Bait Qur'ani Bogor Haris Wahyudi; Nurato Nurato; Wiwit Suprihatiningsih; Nur Indah; Fajar Anggara; Henry Carles; Ariosuko Dharmajati; Andi F Sudarma
Jurnal Pengabdian Masyarakat Bhinneka Vol. 5 No. 1 (2026): September
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v4i4.1651

Abstract

Sampah organik merupakan komponen terbesar sampah domestik di Indonesia dan berisiko mencemari lingkungan jika tidak dikelola dengan baik. Pondok Pesantren Bait Qur'ani telah memiliki fasilitas komposter, namun pemanfaatannya belum optimal karena pemilahan sampah belum konsisten dan pengetahuan peserta mengenai pengoperasian komposter serta proses fermentasi masih terbatas. Kegiatan pengabdian kepada masyarakat ini bertujuan meningkatkan pengetahuan dan keterampilan peserta dalam mengolah sampah organik menjadi pupuk organik cair (POC) menggunakan biokomposter berbantuan bioaktivator Effective Microorganisms 4 (EM4). Metode yang digunakan adalah Participatory Learning and Action (PLA), meliputi koordinasi dengan mitra, penyuluhan, demonstrasi pengoperasian komposter, praktik langsung oleh peserta, dan evaluasi melalui kuesioner persepsi. Demonstrasi menggunakan campuran sampah organik basah dan kering dengan rasio sekitar 80:20 yang difermentasi untuk menghasilkan POC sebagai produk utama dan kompos padat sebagai produk samping. Hasil kegiatan menunjukkan peserta mampu memahami prinsip pemilahan sampah, tahapan pengoperasian biokomposter, penggunaan EM4, proses fermentasi, dan teknik pemanenan POC, dengan mayoritas peserta memberikan tanggapan Setuju hingga Sangat Setuju terhadap materi dan manfaat teknologi ini. Dengan potensi timbulan sampah organik 25–44 kg per hari, optimalisasi biokomposter berpotensi mengurangi beban sampah ke TPA sekaligus menghasilkan POC bermanfaat bagi pemeliharaan tanaman, mendukung konsep Green Pesantren dan ekonomi sirkular.
Co-Authors A. M. Leman Albert Phak Jie Wong Amiruddin Aziz Anggara, Fajar Ariosuko Dharmajati Azhar, Azmi Dafit Feriyanto Dedik Romahadi Deni Shidqi Khaerudini Djajadiwinata, Eldwin Eldwin Djajadiwinata Fajar Anggara Fajar Anggara Fajar V.Enriko Firmansyah, Nisfi Hadi Pranoto Hadi Pranoto Haris Wahyudi Henry Carles Henry Carles Hui Xiong Inayaturrakhman, Ikhsan Islahuddin Islahuddin Kontan Tarigan Lutfiansyah, Anggi Mardani A. Sera Muhamad Fitri Muhammad Akmal Nur Indah Nur Indah, Nur Nurato Nurato Oktaviani, Ana Nur Pandriana, Aap Popy Yuliarty Pudjiwati, Sri Rini Anggraini Sagir Alva Sari, Andarany Kartka Sirait, Alfa Firdaus Sri Pudjiwati Subekti Subekti Supaat Zakaria Susilo, R Dwi Pudji Swandya Eka Pratiwi Tarigan, Kontan Wahyudi, Haris Widianto, Fajar Wiwit Suprihatiningsih Wiwit Suprihatiningsih Xiong, Hui