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All Journal Sinergi Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Ilmiah Teknik Mesin "MEKANIK" Jurnal Anugerah: Jurnal Pengabdian Kepada Masyarakat Bidang Keguruan dan Ilmu Pendidikan IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) IRA Jurnal Pengabdian Kepada Masyarakat
Supriatno, Supriatno
Universitas Medan Area
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Analisis Performa Sepeda Motor Sport 155cc 2 Tak dengan Beragam Jenis Bahan Bakar Nasution, Kurnia Rizky; Jufrizal, Jufrizal; Supriatno, Supriatno
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 1 (2025): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i1.184

Abstract

The development of two-wheeled automotive technology continues to advance, especially in fuel efficiency, engine performance, and emissions. One key factor affecting engine performance is fuel quality. This study investigates the effect of fuel octane rating on torque and power in a 155cc 2-stroke sport motorcycle at 3500–8000 rpm. Three fuel types were tested: Pertamax, Pertamax Turbo, and Pertalite. Maximum torque was recorded at 6000 rpm with values of 11.3 Nm (Pertamax), 11.8 Nm (Pertamax Turbo), and 11.6 Nm (Pertalite). Maximum power was observed at 8000 rpm with 8.2 kW, 8.6 kW, and 8.3 kW, respectively. In addition to octane rating, compression ratio, and engine speed significantly influence torque and power output.
Analisis Efisiensi Termal Kompor Biomassa Tipe Gasifier Downdraft dengan Variasi Massa Campuran Arang Kayu dan Wood Pellet Simatupang, Joel Hasoloan; Jufrizal, Jufrizal; Supriatno, Supriatno
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 2 (2025): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i2.201

Abstract

This study analyzes the thermal efficiency of a downdraft gasifier-type biomass stove using various fuel masses of wood charcoal and wood pellets. The Water Boiling Test (WBT) method was applied with fuel masses of 0.5 kg, 0.75 kg, 1 kg, and 1.5 kg. Observed parameters included thermal efficiency, fuel consumption rate (FCR), power input, and power output. The highest thermal efficiency, 14%, was achieved with 1.5 kg of wood pellets, while charcoal showed a decrease in efficiency at 1 kg. FCR increased with charcoal but decreased with wood pellets, indicating better combustion efficiency. Power input and output increased with higher fuel mass. These findings highlight the importance of fuel type and mass optimization in improving biomass stove performance, thereby supporting Indonesia's transition to renewable energy.
Pengaruh Head dan Jumlah Nozzle terhadap Kinerja Turbin Pelton Skala Laboratorium Supriatno, Supriatno; Setyanto, Djoko
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.320

Abstract

This experimental study examines the influence of hydraulic head and nozzle number on the performance of a laboratory-scale Pelton turbine. A closed-loop test rig was developed, enabling operation with one, two, and four nozzles. The turbine, consisting of 12 buckets, was mechanically coupled to an electrical generator through a belt–pulley transmission. Experimental results reveal that increasing the number of nozzles enhances turbine efficiency, with recorded values of 2.8%, 15.8%, and 17.7% for single-, double-, and four-nozzle configurations, respectively. Despite this improvement, the turbine failed to operate at its optimal efficiency, primarily due to discrepancies between the available head and the turbine design parameters, as well as energy losses and suboptimal jet impingement.
Pemanfaatan Limbah Cangkang Telur Sebagai Katalis Biodiesel Dari Minyak Goreng Limbah Pada UMKM Roti Pakcik Tanjung Morawa Idris, Muhammad; Hermawan, Indra; Jufrizal, Jufrizal; Aldori, Yopan Rahmad; Supriatno, Supriatno; Harahap, Uun Novalia
IRA Jurnal Pengabdian Kepada Masyarakat (IRAJPKM) Vol 3 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajpkm.v3i3.258

Abstract

This Community Service Program focuses on managing micro-business-scale food production waste. The activity was carried out at Pakcik Tanjung Morawa Roti MSMEs in the Tanjung Morawa area. These MSMEs produce used eggshell waste and cooking oil every day. The waste has not been managed systematically and could pollute the surrounding environment. This program aims to increase partners' awareness of the value of organic waste. The program also introduces the concept of waste utilization as an alternative energy source.  The activity's approach is educational and informative through field visits. The methods used include observation, interviews, and two-way discussions. The team conveyed the potential of eggshells as a source of calcium oxide.  Calcium oxide serves as a biodiesel catalyst from waste cooking oil. Activities do not yet include technical training or process demonstrations. The activity results showed an increase in the partners' initial understanding. Partners show interest in sustainable waste management. This program results in a mapping of potential waste and partner needs. The output of the activity is documented in reports and follow-up plans. This program is the foundation for the next stage of technology assistance. A simple approach is assessed based on the partner's capacity. Activities support waste reduction and community-based environmental education. 
Co-Authors Al Ridho, Fatur Fadhillah Barita Barita Darianto, Darianto Darwin, Felix Djoko Setyanto Eswanto Eswanto Eswanto, Eswanto Harahap, Uun Novalia Hasibuan, Samsul Abdul Rahman Sidik Ida Royani Ifan Aulia Candra Ilmi Abdullah INDRA HERMAWAN Iswandi Iswandi Jufrizal Jufrizal Jufrizal Jufrizal Lubis, Rahmadsyah Muhammad Arif Hidayat Muhammad Idris Nasution, Kurnia Rizky Nurdiana Nurdiana Prasetio, Indra Rizki Muliono Simatupang, Joel Hasoloan Susilawati, Susilawati Tamba, Octo Goldwin Tino Hermanto Yoko Nikodemus Manik Yopan Rahmad Aldori zainuddin zainuddin zulfikar, Achmad Jusuf