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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Jurnal Rekayasa Material, Manufaktur & Energi Martabe : Jurnal Pengabdian Kepada Masyarakat AMALIAH: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Abdi Insani IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) IRA Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Bobby Umroh
Universitas Medan Area
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Perancangan Oven Pengering Mie Berkapasitas 15 kg/jam untuk Mendukung Produktivitas PT. Star Umroh Food Muhammad Idris; Bobby Umroh; Uun Novalia Harahap; Iswandi Iswandi; Indra Hermawan; Mahliza Nasution; Darianto Darianto; Tino Hermanto; Yetti Meuthia Hasibuan
IRA Jurnal Pengabdian Kepada Masyarakat (IRAJPKM) Vol 4 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajpkm.v4i1.214

Abstract

Noodle drying at PT. Star Umroh Food still uses sunlight, so it depends on the weather, the temperature is not controlled, the productivity is low, and the level of product dryness is not uniform. This community service activity aims to design a gas-fueled dryer oven with a capacity of 15 kg/hour with forced convection. The methods are surveys, needs analysis, 2D and 3D design, specification analysis and evaluation. The results of the design of the oven with dimensions of 170 × 300 × 180 cm, a working temperature of 70 °C, and an estimated LPG consumption of 0.6 kg/hour. The prediction of increasing productivity and producing more uniform drying.
Pendampingan Layout Ulang Area Produksi dan Identifikasi Kebutuhan Teknologi pada UMKM Roti Pakcik untuk Efisiensi Alur Kerja Tino Hermanto; Iswandi Iswandi; Darianto Darianto; Bobby Umroh; Haniza Haniza; Aginta Yolanda
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.v3i3.372

Abstract

This Community Service activity was carried out at the Roti Pakcik Tanjung Morawa MSME through work process observations, discussions with the owner and workers, and recording the condition of the production facility. The activity focused on two fundamental needs of the MSME: improving the layout of the work area to enhance production efficiency and identifying the need for relevant production technology. The observation results showed a crowded work area, unclear functional zoning, and the movement of materials and products across the same area. These conditions increased waiting times, increased the risk of cross-contamination, and complicated quality control. In addition, the production process still relied on manual practices and limited tools, so there was a need for technology in the form of a flour sifting machine to maintain ingredient consistency, a mixer to maintain dough homogeneity according to production capacity, and a bread cutting machine to speed up the process, improve size uniformity, and reduce work fatigue. The activity resulted in a workflow problem map, an initial zoning design, and a list of technology priorities as a basis for further mentoring. These findings position the program as the initial stage of a realistic and field-based MSME production transformation.
Analisis Pengaruh Penggunaan LPG sebagai Bahan Bakar Alternatif terhadap Performansi dan Efisiensi Mesin Bensin Irvan Hendrawan Surya Dinata; Jufrizal Jufrizal; Darianto Darianto; Tino Hermanto; Bobby Umroh; Nurdiana Nurdiana
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.v4i3.260

Abstract

This study investigates the effect of using Liquefied Petroleum Gas (LPG) as an alternative fuel to Pertalite on the performance, energy efficiency, and operating cost of a 6.5 HP gasoline engine-driven water pump. Experiments were conducted at three engine operating conditions: minimum, average, and maximum engine speeds. The evaluated parameters included engine speed, water discharge, hydraulic power, shaft power, brake specific fuel consumption (BSFC), thermal efficiency, overall system efficiency, and fuel operating costs. The results indicate that the pump's hydraulic performance, as measured by water discharge and hydraulic power, is not significantly affected by the type of fuel used. However, engines that use Pertalite tend to have slightly better thermal and system efficiencies than LPG engines. From an economic perspective, LPG offers a substantial advantage, with lower operating and energy costs per unit of power. Therefore, despite Pertalite's slightly superior technical efficiency, LPG is a more economical alternative fuel for long-duration water pump applications.
Design Modification and Strength Analysis of a Bearing Housing Using Finite Element Method Mulyadi Mulyadi; Bobby Umroh; Hendery Dahlan
Rekayasa Material, Manufaktur dan Energi Vol 9, No 2: JULI 2026
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v9i2.31605

Abstract

Bearing housings are critical mechanical components in small-scale manufacturing machinery. In field operations, standard pillow block designs frequently experience premature structural failures such as material cracking and high deformation under dynamic loads. This study aims to determine the exact structural causes of failure in standard bearing housings used within chain transmission systems and to develop an optimized, structurally superior modified design. The investigation was conducted numerically using open-source tools: FreeCAD for three-dimensional parametric modeling and PrePoMax (CalculiX solver) for Finite Element Analysis (FEA). The component was modeled using ASTM Class 35 Cast Iron with a yield strength of 170 MPa. The loading condition simulated a 1 HP motor running at 1500 rpm with a generated torque of 1.59 kg·m, where the chain tensile force was applied directly to the housing bore. The initial simulation revealed that the baseline design suffered from high stress concentrations around the bolt hole and fillet regions due to insufficient material thickness. The maximum principal stress reached 107.4 MPa, yielding an inadequate safety factor of 1.6 and a displacement of 0.002 mm. To resolve this, structural modifications were implemented by adding reinforcing ribs and thickening the housing profile. The FEA results of the modified design showed a significant stress reduction to 55 MPa (a decrease of approximately 49%). Furthermore, the maximum displacement at the top section dropped to 0.0009 mm, demonstrating a 45% reduction in displacement and higher structural stiffness. Consequently, the safety factor increased substantially from 1.6 to 3.6 (simulated at 3.09 in direct stress ratio). The incorporation of strengthening ribs and wall thickening successfully redistributes operational loads and minimizes material distortion. The modified design satisfies industrial safety regulations and is highly feasible for implementation in small-scale industrial chain drive applications.Keywords: Bearing Housing, Finite Element Method, Stress Concentration, Reinforcing Ribs, Safety Factor.
Perancangan Mesin Pencacah Polimer Komposit untuk Aplikasi Komponen Fuel Cell M Rizky Maulana; Ahmad Fauji S; Iswandi Iswandi; Bobby Umroh
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.v4i2.285

Abstract

This study aims to design a composite polymer shredding machine with a capacity of 50 kg/h to enhance recycling efficiency. The machine is powered by a 3 HP electric motor, equipped with a 1:50 ratio reducer and 200 mm diameter blades. Technical analysis encompasses calculations of cutting force, torque, and throughput, supported by CAD/CAE modeling to validate the structural design. The results show a shredding capacity of 833.33 g/min, cutting force of 47.088 N, and torque of 9.4176 Nm. The machine features a compact, energy-efficient design and delivers consistent output. A UNP steel frame ensures structural stability against dynamic loads. With good efficiency and sustainability, this design is suitable for small to medium-scale industries involved in composite polymer material processing.
Studi Performa Mesin Pencacah Polimer Komposit Berbasis Uji Laboratorium Danial Jack Marbis Sianturi; Theo Fredrik Tumangger; Yopan Rahmad Aldori; Iswandi Iswandi; Bobby Umroh
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.v4i2.290

Abstract

Polymers are the result of monomer polymerization with a lower density than metals but a much smaller elastic modulus, making them less rigid and strongly affected by temperature. This study evaluates the performance of a laboratory-scale crushing machine for polypropylene blended with activated carbon at varying compositions. The machine employed carbon steel rotary blades driven by a 1 HP electric motor through a gearbox transmission. Results showed average crushing times of 3.5–4 minutes/kg. Pure polypropylene produced a 72% fine fraction, while adding 10% activated carbon reduced it to 65%. Crushing efficiency remained above 85%, demonstrating stable performance and feasibility for composite material applications.
Evaluasi Variasi Kondisi Operasi Terhadap Perpindahan Panas Kondensor Pada Proses Destilasi Daun Serai Wangi Arga Daniel Pratama Sirait; Darianto Darianto; Iswandi Iswandi; Bobby Umroh; Muhammad Idris
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.299

Abstract

The condenser plays a crucial role in determining the efficiency of lemongrass (Cymbopogon citratus) essential oil distillation by facilitating heat transfer and vapor condensation. This study analyzes the effect of varying operating conditions on the heat transfer rate, Log Mean Temperature Difference (LMTD), condenser effectiveness, and citronella oil production. The evaluation involved three test variations, comparing heat transfer parameters and condenser performance. The results indicate that the heat transfer rate increased from 152,438.27 W in Variation I to 170,963.54 W in Variation II, reaching 186,544.68 W in Variation III. This increase was accompanied by a rise in the LMTD value from 25.18°C to 29.74°C, an improvement in condenser effectiveness from 81% to 89%, and an increase in the conversion of condensate vapor mass into citronella oil from 28% to 36%. These results demonstrate that the increase in heat transfer rate is directly proportional to condenser effectiveness and the success of the condensation process. Variation III represents the optimum operating condition, as it yielded the most efficient heat transfer and the best condenser performance during the citronella leaf distillation process.
Co-Authors Abdul Rahmansyah Achmad Jusuf Zulfikar Aginta Yolanda Ahmad Fauji S Ahmad Marabdi Siregar Alfifto Amiruddin, Arfis Amrinsyah Amrinsyah Amrinsyah, Amrinsyah Amru Siregar Amru Siregar Arga Daniel Pratama Sirait Azwir Sofyan Budi Harto Dadan Ramdan Danial Jack Marbis Sianturi Danis Nainggolan Darianto Darianto Darianto Darianto Darianto, Darianto dedi kurniadi Dedi Kurniadi Eka Dewi Setia Tarigan Elapri, Bima Yoel Ellen Lumisar Panggabean Fadly A Kurniawan Glusevic, Jean Haniza Harahap, Uun Novalia Harto, Budi Hendery Dahlan, Hendery Indra Hermawan INDRA HERMAWAN Irvan Hendrawan Surya Dinata Iswandi Iswandi Iswandi Iswandi Jean Glusevic Jufrizal Jufrizal Kamaluddin Kurniawan, Fadly A M Rizky Maulana Mahliza Nasution Muhammad Idris Muhammad Idris Muhammad Yusuf Rahmansyah Siahaan Mulyadi Mulyadi Nainggolan, Danis Nurdiana Prawoto, Yogi Purba, Jepriadi Rahmansyah, Abdul Rahmatullah . Rinto Supardi Sipangkar Sarjana, SS Siagian, Martua Sangap Siahaan, Muhammad Yusuf Rahmansyah Sipangkar, Rinto Supardi Siti Alhamra Salqaura Siti Mardiana Sofyan, Azwir Theo Fredrik Tumangger Tino Hermanto Uun Novalia Harahap Yetti Meuthia Hasibuan Yopan Rahmad Aldori Yuni Syahputri zulfikar zulfikar zulfikar, zulfikar