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All Journal Jurnal Rekayasa Mesin Dinamis Sinergi Polmed : Jurnal Ilmiah Teknik Mesin IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Jurnal Polimesin
Abdullah, Ilmi
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Automotive Engineering Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Pengaruh Perbedaan Jumlah Katalis terhadap Angka Yield pada Proses Pembuatan Biodiesel dari Minyak Goreng Sisa Menggunakan Pemanas Double Jacket Suherman, Suherman; abdullah, ilmi; Sabri, Muhammad; Silitonga, Arridina Susan; Suroso, Bekti
Jurnal Rekayasa Mesin Vol 17, No 1 (2022): Volume 17, Nomor 1, April 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i1.3148

Abstract

Biodiesel is biodegradable and non-toxic and has a low carbon content, high lubricity, and Biodiesel is biodegradable and non-toxic and has a low carbon content, high lubricity, and higher ash point than diesel. The purpose of this study was to obtain data on the physicochemical properties of biodiesel from waste cooking oil (WCO) produced with different amounts of catalyst in the transesterification process. Methods This research carried out a two-step process: (1) esterification with an acid catalyst (H2SO4) and (2) transesterification with an alkali catalyst (KOH). The remaining frying oil is degummed by adding 2% H3PO4. Furthermore, the esterification process was carried out by adding 2% (v/v) H2SO4 at 800 rpm for 90 minutes. The transesterification process using an alkaline catalyst (KOH) was varied from 0.7-1.5% at a temperature of 60 oC with a rotation of 800 rpm and a time of 90 minutes. In the ester/transesterification process, the ratio of methanol: oil is 1:2 (v/v). The biofuels are then tested for cetane number, flash point, density, viscosity, calorific value, and others. The results showed that the amount of wet catalyst (KOH) in the transesterification process gave a difference in the yield of WCO oil. The optimum value was obtained at the amount of 1% KOH catalyst, which was 85%.
Analisa Performansi Bahan Bakar Biogas dan Bensin Terhadap Kualitas Pembakaran Pada Engine Genset 4 Tak 1 Silinder Kapasitas 80 cc Abdullah, Ilmi; Yudanto, Bagus Giri; Nasution, Arjanggi; Andiko, Rendi
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 1 No 1 (2022): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v1i1.9

Abstract

This research studies the analysis of the performance of biogas fuel on exhaust gas emissions produced by the engine generator set and as an operational generator from gasoline-fueled to biogas fuel, modifications to the carburetor are necessary. In a complete combustion reaction there are inhibitory gases such as carbon dioxide, impurity gases such as hydrogen sulfide, and gases required for combustion such as oxygen, and incomplete combustion will produce monoxide gas. This test was carried out using gas chromatography at 0/no load, 300, 600, 900 Watt loading. The analysis carried out in this study includes the calorific value that occurs, the combustion reaction, power, torque, average adequate pressure, specific fuel consumption, and thermal events that occur in the generator. Based on the results of research conducted, it is more efficient to use purified biogas for the lowest CO2 emissions of 9.1089%, for O2 of 16.7165%. Based on the results of research conducted it is more efficient to use purified biogas for the lowest CO2 exhaust emissions of 9.1089%, for O2 of 16.7165% but in terms of combustion quality, the use of gasoline is better than biogas of 30381 kJ/kg due to the element content higher carbon gasoline.
Uji Potensi Limbah Panas dari Kompor Gas Satu dan Dua Tungku yang Dibuang ke Lingkungan Jufrizal, Jufrizal; Napitupulu, Farel H.; Abdullah, Ilmi; Ambarita, Himsar; Tarigan, Dicky Adrian Sera
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 1 No 2 (2022): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v1i2.20

Abstract

This research aims to measure the temperature around the burner of a single and two-burner SNI gas stove experimentally. The method involves installing temperature sensors at various points around the burner to measure the temperature distribution during stove operation. Testing one stove with the maximum gas stove setting shows that the temperature of the flame (Tf), inner wall (Ti), and outer wall (To) has an average value of 515.7426°C, 159.4874°C, and 123 respectively. .9852°C. With the minimum gas stove setting, the average values ​​of Tf, Ti, and To are 412.9672°C, 101.7448°C, and 64.1360°C. For testing two stoves with the maximum gas stove setting, the average values ​​of Tf, Ti, and To were 666.9459°C, 146.0443°C, and 81.8967°C respectively, while for the minimum gas stove setting, The average values ​​of Tf, Ti, and To are 596.623°C, 94.6196°C, and 60.9590°C. The results of this measurement indicate that the heat lost to the environment through radiation is still significant, as can be seen from the high temperatures measured on the inner and outer walls of the plate around the burner. These findings are important for improving the design of gas stoves to increase energy efficiency and reduce heat lost to the environment.
EFFECT OF WELDING CURRENT ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF ALUMINIUM AA1135 ALLOYS BY GAS TUNGSTEN ARC WELDING (GTAW) Suherman, Suherman; Abdullah, Ilmi; Suprianto; Darma, Surya; Hendri Budi Kurniyanto
DINAMIS Vol. 11 No. 2 (2023): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v11i2.14334

Abstract

Aluminium alloys have a wide range of applications in the defence and aerospace industry, including for the manufacture of fuel tanks. The welding Current and type of filler metal significantly affect the microstructure formed and the mechanical strength of metal joints. This study aimed to determine the effect of the kind of filler metal (ER5356 filler metal) and welding current (140 amperes, 160 amperes, and 180 amperes) on the mechanical properties and microstructural of aluminium alloys AA1135 by the GTAW welding process. The results showed that the dendrite size increased with increasing welding current. Furthermore, the micro-hardness of the weld metal shows a decreasing trend with increasing welding current. The maximum tensile strength was obtained at a current power of 160 amperes, and all specimens failed at HAZ. The fracture surface of tensile test observations using SEM showed brittle fracture for Er5356 filler metal specimens, while on the fracture surface of the base metal tensile test specimens, it was observed to show ductile fracture. Welding with a current strength of 180 amperes has met the standard acceptance criteria because no cracks were found on the face bend or the root bend specimen
Analisa Pembebanan pada Bilah Pengaduk dan Poros Utama pada Mesin Pencampur Pupuk Majemuk dengan Sofware SOLIDWORK Suherman, Suherman; Abdullah, Ilmi; Suharlan, Didy; Sai'in, Ali; Harahap, Muchsin
Jurnal Rekayasa Mesin Vol. 19 No. 1 (2024): Volume 19, Nomor 1, April 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i1.5363

Abstract

A compound fertilizer mixing machine (mixer) is a type of machine used to produce compound fertilizer. This fertilizer consists of a mixture of humus fertilizer, animal manure and humus soil. This machine is very important in its use as a mixer of different types of fertilizer ingredients, so as to produce a homogeneous mixture. The aim of this research is to design a fertilizer mixing machine that can be used by small and medium industries and farmer groups. In this design, consider the factors that influence the strength of the main components, such as the drive shaft, mixing blade, belt transmission system, machine frame, etc. This research was carried out in three stages, namely the load simulation stage on the drive shaft and stirrer blade to determine the safety factor. The second stage is calculations in the design of the main components of the machine. In the final stage, the process of making the machine and testing is carried out. The design of this machine was simulated using SOLIDWORK 20 software. The simulation results using SOLIDWORK showed a minimum FOS (Factor of Safety) value of 2.98 on the stirrer blade and the main shaft had met the safety factor. The test results of this fertilizer mixing machine have a capacity of 950 kg/hour.
Synthesis and Characterisation of Biolubricants Castor Oil (Ricinus communis L.) Using a Homogeneous Catalyst for Hydraulic Engine Applications Suherman, Suherman; Muktar, Muharnif; Kurniawan, Rendy; Abdullah, Ilmi; Mawardi
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6669

Abstract

Lubricants are essential products that help reduce surface friction and improve machine efficiency. Lubricating oil consists of 90% base oil and 10% additives. Due to the presence of low molecular weight compounds, mineral-based lubricants exhibit a lower flash point and are not biodegradable, unlike natural oils with equivalent viscosity. Currently, mineral-based lubricants still dominate the global market, yet their environmental drawbacks and reliance on depleting petroleum resources have raised growing concerns. Although several studies have reported the potential of vegetable oils as biolubricants, challenges remain in terms of oxidative stability, viscosity control, and production scalability, which limit their widespread industrial application. The high dependence of the industrial and automotive sectors on lubricants, coupled with the depletion of petroleum reserves, drives the need to seek sustainable alternatives to support sustainable green economic development. This study aims to produce biolubricants from castor oil (Ricinus communis L.) using NaOH catalyst through an esterification method. Esterification was carried out by mixing the oil with alcohol in a molar ratio into a 250 ml three-neck flask, then heating it to 180 °C for 4 hours with 1–2% NaOH catalyst and a methanol-to-oil molar ratio of 1:4. The results showed that the highest values of kinematic viscosity, viscosity index (VI), and density were 28.9 mm²/s, 90.3, and 884.9 kg/m³, respectively. The optimum biolubricant yield was obtained with 2% catalyst (80%). The produced biolubricant met the ISO VG 32 standard, which is widely applied in hydraulic oils, for turning, drilling, and sawing processes. These findings highlight that castor oil-based biolubricants can serve as a sustainable alternative to petroleum-based lubricants; however, further research on long-term stability, wear resistance, and large-scale production remains necessary to bridge the gap towards industrial adoption.
Analysis of mechanical properties, microstructure, and distortion of Al6061-T6 alloys plate using GTA and GMA welding process Suherman, Suherman; Muharnif, Muharnif; Marzuki, Marzuki; Lubis, Yusuf; Pohan, Muhammad Ade syahputra; Aulia, Rakha Ramdan; Ali, Rizki M; Abdullah, Ilmi; Wan Hamzah, Azmi
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6261

Abstract

This study compares the effect of filler metal and welding current of gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) on Aluminium alloy Al6061-T6. Three different filler metals, ER4043, ER4047, and ER5356, were used with the GTAW welding process. The welded joints were created at three different welding currents (120, 130, and 140 A) by the GMAW with filler metals ER5356. Optical and scanning electron microscopy (SEM) is used to analyze the surface fracture of impact test welding joints. The results showed that the GMAW process had the most optimum Ultimate Tensile Strenght (UTS) compared to the GTAW welding joint, especially for welding current 130 A. The impact strength of ER4047 filler metal with the GTAW process is higher than other joints (61 J/cm2). Optimum conditions were obtained by the GMAW welding process using a welding current of 130 A with maximum tensile strength and impact strength of 350 MPa and 53 J/cm2, respectively. SEM analysis showed obtained Mg2Si a globular morphology in ER4047 and ER5356 filler metals, and the dimples fracture is indicated at all joints with the GMAW and GTAW processes. Furthermore, increasing welding current by the GMAW process causes higher angular distortion, reduced vickers hardness but does not significantly affect the weld bead. Overall, the GMAW produces better physical and mechanical properties of weld joint compared to GTAW for all types of filler metals but results in greater angular distortion
Evaluation of diesel engine performance and emissions fueled with waste cooking oil biodiesel-plastic pyrolysis oil blends. Aulia, Amanu; Abdullah, Ilmi; Sebayang, Abdi Hanra
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8611

Abstract

The depletion of petroleum reserves, rising fossil fuel demand, and increasing plastic waste pollution highlight the need for alternative fuels. This study investigated the performance and exhaust emissions of a direct-injection diesel engine fueled with waste cooking oil biodiesel blended with plastic pyrolysis oil at concentrations of 5%, 10%, 15%, and 20% (B+A5 to B+A20). Biodiesel was produced through degumming, esterification, and transesterification, while plastic pyrolysis oil was obtained via thermal cracking. Engine tests under a constant load across a range of engine speeds evaluated brake power, brake-specific fuel consumption (BSFC), brake thermal efficiency (BTE), and exhaust emissions. The results indicate that increasing the proportion of plastic pyrolysis oil improved engine performance compared to pure biodiesel. The B+A20 blend provided the best overall performance, with 44.4% higher power output, 39.6% higher BTE, and 30% lower BSFC than biodiesel, although performance remained below conventional diesel. Regarding emissions, B+A20 reduced CO by 16.3% relative to biodiesel and slightly reduced CO₂ (1%), while NOx increased by 59.7%, highlighting a trade-off between improved performance and NOx control. Overall, blending waste cooking oil biodiesel with plastic pyrolysis oil enhances renewable fuel performance and valorizes plastic waste, but further measures are needed to mitigate NOx emissions.
PENGUJIAN EMISI GAS BUANG MESIN OTTO STASIONER DENGAN BAHAN BAKAR CAMPURAN MINYAK PIROLISIS PLASTIK DAN METANOL Siahaan, Enzo Wiranta Battra; Sitorus, Tulus Burhanuddin; Ambarita, Himsar; Nur, Taufiq Bin; Abdullah, Ilmi; Simanjuntak, Janter Pangaduan
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 1 (2026): Edisi Februari
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v7i1.3072

Abstract

Studi ini menganalisis pengaruh penambahan metanol pada minyak pirolisis limbah plastik terhadap emisi gas buang mesin Otto stasioner sebagai upaya meningkatkan kualitas pembakaran bahan bakar alternatif. Penelitian ini bertujuan untuk menganalisis pengaruh fraksi metanol dalam bahan bakar minyak pirolisis limbah plastik terhadap emisi HC, CO, CO₂, O₂, dan nilai lambda pada mesin Otto stasioner serta mengidentifikasi komposisi campuran optimum berdasarkan kinerja emisi. Pengujian dilakukan pada tiga putaran mesin yaitu 1500 rpm, 2000 rpm, dan 2500 rpm dengan parameter emisi yang diukur meliputi HC, CO, CO₂, O₂, dan nilai lambda. Hasil pengujian menunjukkan bahwa campuran 5% metanol dengan 95% pirolisis plastik memberikan performa emisi terbaik, ditandai dengan kadar HC dan CO yang lebih rendah, CO₂ lebih tinggi, serta O₂ yang lebih rendah dibandingkan campuran lainnya. Sementara itu, pada campuran 10% dan 15% metanol terjadi peningkatan emisi HC dan CO serta penurunan CO₂, yang menandakan pembakaran kurang sempurna. Dengan demikian, penambahan metanol dalam jumlah terbatas mampu meningkatkan efisiensi pembakaran dan menekan emisi berbahaya dari mesin Otto stasioner berbahan bakar campuran pirolisis plastik.
Co-Authors Abdi Hanra Sebayang Ali, Rizki M Andiko, Rendi Arridina Susan Silitonga - Aulia, Amanu Aulia, Rakha Ramdan Farel H. Napitupulu Hendri Budi Kurniyanto Himsar Ambarita Jufrizal Jufrizal Kurniawan, Rendy Lubis, Yusuf MARIA BINTANG Marzuki Marzuki Mawardi Muchsin Harahap Muharnif M Nasution, Arjanggi Nur, Taufiq Bin Pohan, Muhammad Ade syahputra Sai'in, Ali Siahaan, Enzo W.B Simanjuntak, Janter Pangaduan Suharlan, Didy Suherman Suherman, Suherman Suroso, Bekti Surya Darma Tarigan, Dicky Adrian Sera Tulus Burhanuddin Sitorus Wan Hamzah, Azmi Yudanto, Bagus Giri