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Politeknik Negeri Semarang, Indonesia
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INDONESIA
Jurnal Rekayasa Mesin
Published by Politeknik Negeri Semarang
ISSN : 14116863     EISSN : 25407678     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin(d/h MANDEGANI) diterbitkan sejak 1997, dengan frekuensi 3 kali setahun. Misi : media komunikasi bagi dosen, praktisi, dan ilmuwan tentang karya ilmiah (scientific article) hasil-hasil penelitian, survei, studi kasus dan telaah pustaka yang erat hubungannya dengan teknik mesin, meliputi topik/tema seperti perancangan mesin, instalasi, perawatan & perbaikan mesin, bahan konstruksi & komponen mesin, teknik pengerjaan logam, pembuatan komponen mesi n, pengujian bahan dan komponen mesin, teknik pengukuran & kontrol kualitas proses/produk industri manufaktur, manajemen & teknik produksi industri manufaktur, pembentukan dan pengembangan desain produk, aplikasi komputer dalam sistem kendali & operasi mesin, mesin-mesin kalor & fluida, sistem pembangkitan energi, mesin pendingin & pengkondisian udara, pembangkitan energi alternatif & terbarukan.
Arjuna Subject : -
Articles 478 Documents
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Analisis Beban Pendinginan Kereta Argo Lawu New Generation Menggunakan Metode Cooling Load Temperature Difference (CLTD) Ananta, Ferdyansah; Trisma Jaya Saputra; Nurmala Dyah Fajarningrum
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6282

Abstract

Kereta Argo Lawu New Generation adalah salah satu layanan transportasi kereta api yang dioperasikan oleh PT Kereta Api Indonesia (KAI) untuk rute Solo Balapan - Gambir. Kenyamanan termal penumpang menjadi aspek penting dalam layanan ini, mengingat fluktuasi suhu eksternal yang signifikan. Sistem pendingin udara (AC) pada kereta harus mampu menjaga suhu yang nyaman selama perjalanan. Namun, perhitungan beban pendinginan yang akurat diperlukan untuk memastikan kapasitas sistem pendingin sesuai dengan kebutuhan termal dalam gerbong. Penelitian ini menggunakan metode Cooling Load Temperature Difference (CLTD) untuk menganalisis kebutuhan beban pendinginan pada Kereta Argo Lawu New Generation. Perhitungan dilakukan dengan mempertimbangkan faktor eksternal (radiasi matahari, suhu lingkungan) serta faktor internal (jumlah penumpang, peralatan elektronik, dan pencahayaan). Data yang dikumpulkan meliputi spesifikasi material gerbong, kapasitas pendinginan AC, serta parameter lingkungan seperti suhu dan kelembapan. Hasil perhitungan menunjukkan bahwa total beban pendinginan yang diperlukan adalah 37814,93 kkal/jam, sementara kapasitas AC yang tersedia sebesar 40000 kkal/jam. Hal ini mengindikasikan bahwa sistem pendingin yang terpasang masih mampu menjaga suhu dalam batas kenyamanan termal. Kesimpulan dari penelitian ini adalah bahwa metode CLTD dapat digunakan secara efektif dalam perhitungan beban pendinginan kereta api dan dapat dijadikan acuan dalam perancangan sistem pendingin transportasi massal lainnya.
Fracture and Failure Analysis of Wheel Bolt on Main Landing Gear CN235 220M Aircraft Dewa, Rando Tungga; Daffa Mandala Adinata; Ida Farida; Sovyan Aritonang; Hadi Wahyudi
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6291

Abstract

The wheel bolt of the CN235 220M aircraft is a type of fastener crucial for maintaining air pressure within the tire. It was discovered that this component fractured during operation. This study aims to conduct forensic analysis on the mechanism and causes of material failure through micro and macro morphological observations, chemical composition tests, microstructural analysis, and hardness testing on the fractured bolt. Micro-morphology results showed a crack tip in the initiation zone, which became a stress concentration point. Additionally, striations caused by cyclic loading were observed. EDS analysis revealed a high oxygen content in the initiation zone, indicating a corrosion-assisted crack. As cyclic loading continued, it gradually eroded the bolt's cross-sectional area until the material's fatigue led to final fracture.
The Influence of Full Annealing Process Combined with Repetitive Hammering on the Mechanical Properties of AISI 316 Steel Muliastri, Destri; Raharjo, Slamet
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.v20i2.6369

Abstract

AISI 316 steel is known for its corrosion resistance, high hardenability, and good formability. It belongs to meta-stable austenitic stainless steel, where its microstructure can transform into α-martensite under treatments like Dynamic Plastic Deformation (DPD). This steel contains 16-18% Cr and 10-14% Ni. This study aims to analyze the mechanical properties of AISI 316 steel after annealing and after combining annealing with strain hardening through repetitive hammering. The research parameters included full annealing at 1050ºC with a holding time of 30 minutes, followed by repeated hammering for 30, 60, and 90 times, and annealing at 1050ºC with repeated hammering 30 times at the same temperature. A 5 kg iron load was used during the hammering process. The tests conducted were Optical Emission Spectroscopy (OES), hardness testing using the micro vickers method, tensile testing, microstructure analysis, and calculations of strain and thickness reduction. Results showed that the untreated specimen had a hardness of 269.3 VHN, while full annealing at 1050ºC reduced it to 165.2 VHN. Combining annealing with 30, 60, and 90 hammer blows increased hardness to 213.4, 228.5, and 251.4 VHN, respectively, demonstrating the effect of repeated hammering on the mechanical properties of AISI 316 steel.
Front Matter Jurnal Rekayasa Mesin Vol. 20 No. 1 April 2025 Saputra, Eko
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6379

Abstract

Back Matter Jurnal Rekayasa Mesin Vol. 20 No. 1 April 2025 Saputra, Eko
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6380

Abstract

Numerical Study of EV Frame Performance in Side Pole Collision: ASTM A36 vs. AL-7075T6 Analysis Mukhlis Amin; Bahatmaka, Aldias Bahatmaka
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.v20i2.6438

Abstract

Electric vehicles are emerging as eco-friendly alternatives to reduce greenhouse gas emissions and combat global warming. The Indonesian government supports this transition through subsidies, infrastructure development, and regulations encouraging electric vehicle adoption. Automotive manufacturers are enhancing electric vehicle models with safer and more efficient technology. Ensuring the frame's durability during collisions is crucial for safety. Structural engineering plays a vital role, as material failure from operational loads or impacts can lead to significant losses. The large and heavy batteries in electric vehicles present challenges in designing frames that support loads while maintaining passenger safety. Side-pole crash testing is essential due to the limited crumple zones on vehicle sides. This study analyzed the performance of ASTM A36  and AL-7075T6 materials in a side-pole collision at 32 km/h speed using the Finite Element Analysis method. The results showed that both materials experienced almost the same deformation, 98.79 mm for ASTM A26 and 98.77 mm for AL-7075T6. It is, however, a large difference in the maximum stress, ASTM A36 at 4849.7 MPa, and AL-7075T6 at only 1699.9 MPa. This was shown that AL-7075T6 has a better impact resistance than ASTM A36, therefore increasing the safety of electric vehicle frames for side-pole collision conditions.
Optimization Design of NACA 4412 Airfoil Based on Genetic Algorithm for Efficiency and Maximum Lift Force Laksono, Aryo Eko; Bahatmaka, Aldias; Fitriyana, Deni Fajar; Laksono, Galih Tri; Habibullah, Muhammad; Nubli, Haris; Hyung, Cho Joung
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.v20i2.6531

Abstract

The NACA 4412 airfoil, renowned for its exceptional subsonic aerodynamic performance, faces critical operational constraints including elevated drag characteristics and premature stall onset at high angles of attack. While previous investigations have independently examined internal slot modifications and gurney flap implementations for aerodynamic enhancement, the synergistic potential of their combined application to the NACA 4412 configuration remains largely unexplored. This research presents a comprehensive optimization study that strategically integrates internal slot geometry with gurney flap configuration to maximize lift coefficient (CL) and aerodynamic efficiency (CL/CD) through advanced genetic algorithm optimization. The methodology employed high-fidelity computational fluid dynamics simulations using FLUENT with Spalart-Allmaras turbulence modeling, validated against experimental data to ensure accuracy. PCHIP numerical interpolation techniques were utilized to estimate aerodynamic coefficients across comprehensive angle-of-attack ranges not directly simulated. The optimized configuration demonstrated remarkable performance improvements, including a 75.68% increase in lift coefficient, an extension of the critical stall angle from 14° to 16°, enhanced aerodynamic efficiency, and significantly improved flow stability with reduced separation characteristics. These findings establish that the synergistic combination of internal slot and gurney flap modifications can fundamentally transform NACA 4412 aerodynamic performance, particularly excelling in high-angle-of-attack operational scenarios.
The Effect of Coal and Sawdust Co-Firing on Boiler Efficiency with the Direct and Indirect Calculation Methods at PT PLN Nusantara Power Unit 2 Issafira, Radissa Dzaky; Rizki, Muhammad Daru Fatkhur; Mokh Ausin Al Qoroni; Wardana, Vrischo Candra Kumara
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.v20i2.6548

Abstract

The increasing demand for electricity in Indonesia has led to a rise in fossil fuel consumption, resulting in negative environmental impacts. As part of its commitment to achieving net zero emissions by 2060, the Indonesian government has begun promoting the application of co-firing technology that utilizes biomass as an alternative fuel. One promising type of biomass is sawdust, which can be blended with coal in the combustion process. This study aims to analyze the effect of sawdust blending on boiler efficiency using both direct and indirect calculation methods. The results show that a fuel composition of 55% low-rank coal (LRC), 40% medium-rank coal (MRC), and 5% sawdust produces a boiler efficiency of 86.8% using the direct method and 85.2% using the indirect method. Additionally, this blend generates lower emissions compared to a mixture of 80% LRC and 20% MRC. These findings indicate that sawdust, when applied through co-firing technology, contributes to improved combustion efficiency and reduced emissions in coal-fired power plants.  
The Effect of Injection Parameters on Warpage, Shrinkage, and Tensile Strength of Polypropylene Composites Andre Bawono, Julius; Budiarto; Kurniawan, Perwita
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.v20i2.6573

Abstract

Polypropylene composite material is an environmentally friendly material when compared to other polymer materials because the composition of polypropylene is only 76% and the remaining 24% is limestone. The use of this composite material is to reduce dependence on the use of Acrylonitrile Butadiene Styrene (ABS) and Acrylic Styrene (AS) resins because both materials are difficult to decompose and recycle. The "base" product made from this material has a warpage defect that causes a gap effect when the product is installed with other components. Therefore, a study was conducted on the effect of mold temperature and holding pressure on warpage defects, shrinkage, tensile strength and surface morphology. This study used an experimental method with variations in mold temperature used were 20°C, 40°C, and 60°C, variations in holding pressure used were 70 bar, 110 bar, and 150 bar. Testing was carried out by measuring dimensions to determine warpage, shrinkage percentage, measuring tensile strength and observing surface structure. The warpage value decreases by 29% at high mold temperatures and increases by 84% at high holding pressure. The shrinkage percentage decreases with increasing mold temperature and holding pressure in the transverse direction by 7.14%-9.52% at constant pressure and 25%-26.29% at constant temperature, in the longitudinal direction by 1.27%-6.21% at constant pressure and 13.92%-17.95% at constant temperature. The optimal parameters to obtain the highest tensile strength of 26.77 MPa are at a mold temperature of 60°C and a holding pressure of 110 bar.
Mechanical Properties and Homogenous Analysis of Semirigid Polyurethane Foam used in Headliner Roof Top Manufacturing Process Nugroho, Adi; Antonius Fajar Bisma; Perwita Kurniawan
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.v20i2.6575

Abstract

In the automotive industry with four wheels or more, polyurethane is used as the main material in making roof top headliners. The process of making roof top headliners often experiences product defects, namely breaks (cracks or fractures). The study was conducted to analyze the homogeneity of mechanical characteristics at various positions in one block of polyurethane foam that had been cut into sheets with a thickness of 8 mm. Samples were taken representing vertical and horizontal positions and tested using the true experiment spatial sampling method. From this study, it was found that the density in one block of semi-rigid polyurethane foam was not homogeneous. There were differences in density in the upper, middle and lower materials in zones 1 to 9. The density value is directly proportional to the bending strength value and inversely proportional to the elongation value. In the zone where the elongation value is low, there is a risk of product defects in the form of fractures if the product's formability strength simulated using NX software is higher than 18%.

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