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All Journal STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering Journal of Mechanical and Electrical Technology
Septiawan, Diama Rizky
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Automotive Engineering Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS PENGARUH BEBAN EKSTERNAL TERHADAP DISTRIBUSI REGANGAN PADA PIPA MELALUI PENDEKATAN FINITE ELEMENT METHOD Risnawati, Faradilla Fauziyah; Huda, Muhammad Arif Nur; Kautzar, Galuh Zuhria; Septiawan, Diama Rizky
Steam Engineering Vol. 7 No. 1 (2025): STEAM Engineering, Vol. 7, No. 1, September 2025
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jptm.v7i1.22791

Abstract

This study aims to analyse the effect of external loading on the distribution of plastic strain in API 5L X80 steel pipes using the Finite Element Method. External loading was modelled through an indentation process using a spherical indenter with diameter variations of 75 mm, 100 mm, and 125 mm, and indentation depths of 2 mm, 3 mm, and 4 mm. The simulation was conducted under zero internal pressure conditions to evaluate the plastic strain distribution formed after loading. The results show that increasing the indentation depth significantly increases the maximum plastic strain value and expands the deformation area on the pipe wall. Conversely, increasing the indenter diameter tends to reduce the maximum plastic strain value but broadens the affected area of strain distribution. The maximum strain concentration is located at the dent’s flank rather than the root, which is caused by the load distribution from the spherical indenter toward the transition area. These findings highlight the importance of dent geometry parameters in predicting the plastic strain response of pipes, providing valuable insights for assessing the structural integrity of pipelines in oil and gas industry applications
ANALISIS BOTTLENECK PERAKITAN METAL BOX DENGAN METODE SIMULASI DISKRIT MELALUI SOFTWARE PROMODEL Rakhmaddian, Nicko Nur; Farida, Nike Nur; Putra, Agus Dwi; Septiawan, Diama Rizky; Wulandari, Winda Andrini
Steam Engineering Vol. 7 No. 1 (2025): STEAM Engineering, Vol. 7, No. 1, September 2025
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jptm.v7i1.22818

Abstract

Bottlenecks are a major cause of productivity decline in manufacturing systems. In the PDAM metal box industry at PT. MNO, the production process frequently encounters constraints that reduce output. This study employed discrete event simulation using ProModel software. The research stages included field observation, process time data collection, data distribution analysis with Stat::Fit, and model validation through Chi-Square and Mann-Whitney tests. The simulation revealed a significant bottleneck in the assembly workstation, with utilization reaching 93.64%, while production output was limited to 22 units during a 7-hour working shift. In contrast, the finishing station experienced idle time. An improvement scenario involving the addition of one workstation and one operator in the assembly and finishing processes is recommended to reduce production flow imbalances. This study confirms the effectiveness of discrete event simulation as an analytical tool for production system optimization and highlights opportunities for further development through digital twin integration and metaheuristic optimization
Studi Eksperimental Pengaruh pH Pendingin Mesin terhadap Suhu Kerja dan Emisi Gas Buang pada Motor 4 Silinder Septiawan, Diama Rizky; Wijoyo, Wijoyo; Putra, Agus Dwi; Surjadi, Eko; Fadillah, Faqih
Metrotech (Journal of Mechanical and Electrical Technology) Vol 5 No 1: Januari 2026
Publisher : Fakultas Sains dan Teknologi, UNIRA Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/metrotech.v5i1.8263

Abstract

Tujuan dari penelitian ini adalah untuk memperoleh pendingin yang mampu menahan suhu operasi mesin lebih lama (suhu operasi mesin rendah) dan mengurangi emisi mesin. Pendingin radiator adalah pendingin yang biasanya digunakan pada radiator. Komponen ini berfungsi untuk mengontrol suhu di dalam mesin kendaraan agar tidak berlebihan karena dapat menyebabkan mesin panas berlebih dan merusak mesin mobil. Penggunaan air biasa atau air mineral tidak dapat memaksimalkan kinerja pendingin dalam mendinginkan mesin. Dalam penelitian ini metode yang digunakan adalah metode eksperimental untuk menguji apakah variabel eksperimen efektif atau tidak. Variabel Independen, variasi jenis cairan pendingin, Variabel Dependen, suhu kerja mesin dan emisi knalpot, Variabel Kontrol, suhu ruangan saat pengumpulan data. Hasil penelitian menunjukkan bahwa suhu kerja tertinggi diperoleh dengan menggunakan air suling dengan tingkat keasaman (pH) 6,32, yaitu 89,5 oC dan suhu kerja mesin terendah. Hasil menunjukkan bahwa suhu kerja tertinggi diperoleh dengan menggunakan air suling dengan tingkat keasaman (pH) 6,32, yaitu 89,5 oC, dan suhu kerja mesin terendah adalah dengan menggunakan cairan pendingin jenis Water coolant (pH 8,04) 85 oC. Penggunaan Water coolant (pH 8,04) sebagai cairan pendingin dapat mengurangi emisi gas buang CO sebesar 0,13%, HC sebesar 6,8 ppm, dan NOx sebesar 3,1 ppm. Kesimpulan yang diperoleh adalah bahwa suhu kerja mesin terendah diperoleh dengan menggunakan cairan pendingin jenis Water coolant dan dapat mengurangi emisi gas buang CO, HC, dan NOx.
Co-Authors Eko Surjadi Faqih Fadillah Farida, Nike Nur Galuh Zuhria Kautzar Muhammad Arif Nur Huda Nicko Nur Rakhmaddian, Nicko Nur Putra, Agus Dwi Risnawati, Faradilla Fauziyah Wijoyo Wijoyo Wulandari, Winda Andrini