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All Journal Journal of Mechanical Design and Testing (JMDT) Eksergi: Jurnal Teknik Energi BULLET : Jurnal Multidisiplin Ilmu AMMA : Jurnal Pengabdian Masyarakat Jurnal Polimesin
Al Huda, Luqman
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Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing

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Studi Eksperimental Pengaruh Convective Heat Transfer terhadap Pressure Drop pada Aliran Dua Fase Gas-Cair Fluida Newtonian dan non-Newtonian dalam Square Microchannel Al Huda, Luqman; Kusumaningsih, Haslinda; Deendarlianto, Deendarlianto; Indarto, Indarto
Journal of Mechanical Design and Testing Vol 5, No 2 (2023): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.73376

Abstract

Penelitian terkait dua fase gas-cair dalam saluran mikro telah banyak dilakukan. Namun, keterlibatan fluida non-newtonian serta kalor dalam aliran dua fase suatu saluran mikro masih terbatas, terutama pemecahan masalah pada pendinginan perangkat mikro. Permintaan terhadap efisiensi aliran fluida dua fase dalam mengikat kalor menjadi parameter penting dalam keberhasilan sistem pendinginan. Tujuan penelitian ini membandingkan beda tekanan antara fluida newtonian dan non-newtonian berdasarkan perbedaan viskositas pada aliran dua fase. Penelitian juga menambahkan perlakuan kalor konveksi dan mengamati pada dua area, yaitu sebelum (upstream) dan sesudah (downstream) terdampak kalor. Jenis fluida cair newtonian yang digunakan yaitu aquadest dan fluida non-newtonian yaitu Carboxymethil Cellulose (CMC wt 0,4%), sedangkan fluida gas yang digunakan adalah nitrogen. Dimensi diameter hidrolis saluran sebesar 0,8 mm. Kecepatan superfisial cairan divariasikan mulai 0,1 m/s hingga 1 m/s, sedangkan kecepatan superfisial gas divariasikan mulai 0,26 m/s hingga 7,81 m/s. High speed video camera digunakan untuk merekam pola aliran, panjang dan kecepatan gelembung terbentuk. Hasil penelitian aliran nitrogen-aquadest membentuk pola aliran bubbly, slug, churn dan slug-annular, sedangkan nitrogen-CMC wt 0,4% membentuk slug, churn dan slug-annular. Perbedaan viskositas aquadest memberikan beda tekanan lebih rendah daripada CMC wt 0,4%. Penambahan kalor mampu memberikan beda tekanan yang lebih rendah diiringi dengan penurunan viskositas cairan.
Analisis Kerusakan Retract Actuator Nose Landing Gear Pada Pesawat Boeing 737-800 Next Generation Pambekti, Arif; Misi Okia, Yudha; Kurniawan, Riski; Al Huda, Luqman; Evan, Bah; Kamal Fajri, Amrisal; Tri Efendi, Erwan
BULLET : Jurnal Multidisiplin Ilmu Vol. 3 No. 6 (2024): BULLET : Jurnal Multidisiplin Ilmu
Publisher : CV. Multi Kreasi Media

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Abstract

The retract actuator is one of the main parts of the landing gear, which functions to retract or extend. The retract actuator must be free in its operation and its movement must also be smooth. If the aircraft experiences a failure of the retract actuator function, namely the retract actuator in a slow to retract condition. Where there is a slowdown during retract and extend. Careful handling is required and in accordance with applicable aircraft maintenance procedures, especially regarding slow to retract conditions. This study uses a direct observation method for the analysis of the troubleshooting process on the B737-800 NG in the Merpati Maintenance Facility hangar. In addition, this study also uses the Fault Tree Analysis method to obtain the cause of the failure of the standby reservoir. After analyzing the results, the possible causes of failure in the Retract Actuator are by using the Fault Tree Analysis (FTA) method, the minimum cut set results are obtained with calculations consisting of 18 basic events.
Pelatihan Sistem Air Conditioning Pesawat Boeing 737-200 Bagi Siswa Jogja Flight Pambekti, Arif; Al Huda, Luqman; Evan, Bah; Kamal Fajri, Amrisal; Tri Efendi, Erwan
AMMA : Jurnal Pengabdian Masyarakat Vol. 3 No. 12 : Januari (2025): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

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Abstract

Partners in this community service activity are Jogja Flight students. The goals and targets to be achieved in community service for Jogja Flight students are to increase students' knowledge about one of the aircraft systems, namely air conditioning. With this activity, it is hoped that it can increase students' provisions in job competition in the aviation world. To achieve the goals and targets of this community service program, partners are given training on air conditioning systems in the form of writing, pictures or videos during this activity. After this activity, Jogja Flight students have an additional ability of 90% which was initially only 17% about the Boeing 737-200 aircraft air conditioning system which is useful as added value when working later.
Case Study on Energy Strategy Concerning Santa Ana Wind Activity Triggering Fires in Southern California Evan, Bah; Al Huda, Luqman; Dianisa Khoirum Sandi; Yusuf Dewantoro Herlambang; Eri Prihatmini; Vita Ayu Aspriyanti
Eksergi Vol. 20 No. 03 (2024): SEPTEMBER 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i03.6348

Abstract

Santa Ana winds, which are characterized by their scorching, arid, and forceful surges, significantly exacerbate wildfire hazards in Southern California, extending to 23,000 ha, particularly in the Los Angeles region. The purpose of this study is to examine the correlation between anthropogenic influences and natural climatic phenomena, with a specific focus on the influence of regional energy policies on the frequency and intensity of wildfires. The interaction between the Santa Ana winds and landscapes that are becoming more flammable has become more intensive in recent decades, although they are a natural phenomenon. Inadequately regulated urban expansion, prolonged droughts, and elevated temperatures are the causes of this intensification. Utility companies explicitly link wildfire ignitions during wind events to their energy infrastructure, particularly above-ground power lines. Moreover, the crisis has been further exacerbated by inadequate utility modernization, delayed policy reforms, and limited investment in fire-resilient infrastructure. This study assesses the degree to which regulatory inertia and climate change interact to elevate the likelihood of wildfires by analyzing historical wildfire data, meteorological patterns, and the evolution of California's energy policies. In the face of escalating climatic extremes, the results underscore the urgent need for energy strategies that are forward-thinking and integrated and that prioritize environmental sustainability, conflagration prevention, and resilience.
Optimization of cutting current in CNC plasma cutting for improved bracket fabrication quality Sai'in, Ali; Yudha, Venditias; Al Huda, Luqman; Abidin, Zaenal; Prawibowo, Hartanto
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8618

Abstract

CNC plasma cutting is widely used in metal fabrication due to its efficiency and versatility; however, parameter optimization is essential to ensure high-quality results. This study investigates the influence of CNC plasma cutting parameters affect the fabrication quality of Revo motorcycle brackets, which are essential for electric motor vehicle conversion. We conducted experiments on 6 mm thick low-carbon steel plates using a JIAXIN JX-1530 machine. The electric current was varied at 50, 52, 54, and 56 A. For each current level, four specimens were prepared and tested while keeping other parameters constant: a cutting speed of 600 mm/min, a gas pressure of 6 bar, and a torch distance of 1–2 mm. We assessed cut quality based on surface roughness (Ra) at two measurement points, dimensional accuracy relative to CAD design, and hardness variations in the Heat-Affected Zone (HAZ) and base material. The results showed that the best conditions were achieved at 50 A, 6 bar gas pressure, and a torch distance of 2 mm, resulting in an average Ra of 5.39 µm and a dimensional deviation of ±0.3 mm. Although increasing the current above 50 A improved HAZ hardness, it negatively impacted surface roughness and increased the risk of thermal defects. These findings indicate that the identified optimal parameters support the production of high-precision, cost-effective brackets.
Co-Authors Arif Pambekti Deendarlianto Dianisa Khoirum Sandi Eri Prihatmini Evan, Bah Indarto Indarto Kamal Fajri, Amrisal Kusumaningsih, Haslinda Misi Okia, Yudha Prawibowo, Hartanto Riski Kurniawan Sai'in, Ali Tri Efendi, Erwan Vita Ayu Aspriyanti Yudha, Venditias Yusuf Dewantoro Herlambang Zaenal Abidin