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All Journal Jurnal Teknik Industri Terintegrasi (JUTIN) AMMA : Jurnal Pengabdian Masyarakat Sultra Journal of Mechanical Engineering
Akhsan Hamka
Universitas Patria Artha
Aerospace Engineering Humanities Automotive Engineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing

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Analisis tingkat emisi gas buang dari kendaraan operasional Dinas Perhubungan Kabupaten Sidenreng Rappang dan implikasinya terhadap kualitas udara Muhammad Arham; Husni Mubarak; Husni Husni; Muhammad Fachruddin; Akhsan Hamka; Marten Rombe
Sultra Journal of Mechanical Engineering Vol. 4 No. 1 (2025): Sultra Journal of Mechanical Engineering
Publisher : Program Studi Teknik Mesin, Universitas Sulawesi Tenggara

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Abstract

Penelitian ini bertujuan untuk menganalisis karakteristik kendaraan dan hubungannya terhadap konsentrasi emisi gas buang pada kendaraan operasional Dinas Perhubungan Kabupaten Sidenreng Rappang. Penelitian dilakukan terhadap sembilan kendaraan dengan berbagai merek, kapasitas silinder, umur kendaraan, panjang perjalanan, dan intensitas perawatan yang berbeda. Metode yang digunakan adalah observasi langsung serta pengujian emisi gas buang berdasarkan parameter CO dan HC untuk mesin bensin, serta opasitas (opacity) untuk mesin diesel. Hasil pengujian menunjukkan bahwa 88,88% kendaraan lulus uji emisi, sementara 11,11% tidak lulus karena melebihi ambang batas opasitas yang ditetapkan, terutama pada kendaraan Mitsubishi Truck. Hasil analisis menunjukkan bahwa perawatan kendaraan merupakan faktor paling berpengaruh terhadap tingkat emisi gas buang. Kendaraan dengan umur lebih dari 10 tahun tetap dapat memenuhi baku mutu emisi selama dilakukan perawatan secara rutin. Selain itu, panjang perjalanan yang telah ditempuh juga turut memengaruhi emisi gas buang karena semakin panjang jarak tempuh, konsumsi bahan bakar meningkat sehingga emisi gas buang pun bertambah. Namun demikian, intensitas dan kualitas perawatan kendaraan mampu menekan peningkatan emisi tersebut. Penelitian ini menegaskan pentingnya pengelolaan operasional kendaraan melalui perawatan berkala guna menjaga performa mesin dan menekan pencemaran udara dari emisi kendaraan bermotor.
Evaluasi Efektivitas Program Pemeliharaan Belt Conveyor 6E1U02 Terhadap Produktivitas Unit Raw Mill PT. Semen Tonasa Menggunakan Metode Reability Centered Maintenance (RCM) Syamsumarlin Taha; Muhammad Arham; Asnefi; Muh. Rais; Rosihan Aminuddin; Irwan Syarif; Husni Mubarak; Akhsan Hamka; Muhammad Facheruddin BJ; Jumiati Usman
AMMA : Jurnal Pengabdian Masyarakat Vol. 3 No. 12 : Januari (2025): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

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This study evaluates the effectiveness of the maintenance program aimed at identifying the causes of downtime in machines or equipment at the raw mill unit of PT. Semen Tonasa, which consists of three main sections: mechanical, electrical, and production. Based on data analysis, it was found that the causes of downtime were evenly distributed, with mechanical and production each contributing 31%, and electrical contributing 38%. The dominant cause of downtime was found in the production section, with the main issue being a broken gearbox protection. Over the past six months, the gearbox component failed twice, resulting in a total downtime of 22.30 hours. To address this issue, Reliability Centered Maintenance (RCM) was applied to identify the components responsible for machine failure. The results identified four key components contributing to downtime: the gearbox chain, Belt Conveyor, bucket elevator, and motor. The maintenance decisions taken included failure finding and time-directed life-renewal restoration for the gearbox, bucket elevator, and motor, as well as lubrication and time-directed life-renewal restoration for the Belt Conveyor chain. The expected outcome is an improvement in the reliability and performance of the machines at the raw mill unit of PT. Semen Tonasa.
Karakterisasi Performa Turbin Archimedes Screw pada Sistem Hydropower dengan Variasi Sudut Kemiringan Muhammad Arham; Irman Irman; Marten Rombe; M Ilham Nur; Akhsan Hamka
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 3 (2026): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i3.61643

Abstract

The Archimedes screw turbine is a promising technology for low-head hydropower because of its simple construction and low maintenance requirements. This study investigated the performance of a three-pitch Archimedes screw turbine by varying shaft inclination angles (31°, 39°, and 47°) under five flow discharge rates (0.004704–0.014113 m³/s). Experiments were conducted using a laboratory-scale test rig. Flow discharge, shaft rotational speed, and generator output were measured using a weir meter, tachometer, and multimeter. Increasing flow discharge consistently increased shaft rotational speed and turbine output power. The maximum output power of 61 W was achieved at a 47° inclination angle with a discharge of 0.014113 m³/s, while the highest efficiency of 71% was obtained at the same angle with 0.007057 m³/s. Efficiency decreased beyond the optimum operating condition because of hydraulic losses, including turbulence, leakage flow, and backflow. Optimizing shaft inclination and operating discharge is essential for improving low-head hydropower performance.
Co-Authors Asnefi Husni Husni Husni Mubarak Irman Irman Jumiati Usman M Ilham Nur Marten Rombe Muh. Rais Muhammad Arham Muhammad Facheruddin BJ Muhammad Fachruddin Rosihan Aminuddin Syamsumarlin Taha Syarif, Irwan