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R.E.M (Rekyasa Energi Manufaktur) Jurnal
Published by Universitas Muhammadiyah Sidoarjo
ISSN : 25275674     EISSN : 25283723     DOI : https://doi.org/10.21070/r.e.m
Core Subject : Engineering,
Engineering
Focus and Scope Aim: to facilitate scholar, researchers, and teachers for publishing the original articles of review articles. Scope: Mechanical Engineering include: Energy Conversion Renewable Energy Manufacturing Materials and Design Engineering Mechatronics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 167 Documents
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Static Load Evaluation of Kaplan Turbine Shaft in Hydraulic Pump System Using Finite Element Analysis (FEA) Method: Evaluasi Beban Statis Poros Turbin Kaplan Pada Sistem Pompa Hidrolis Menggunakan Metode Finite Element Analysis (FEA) Muzakki, Haykal; Komarudin, Udin; Prasetia, Adhita
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1827

Abstract

The turbine shaft is a critical component in hydraulic pump systems as it transmits mechanical energy from the turbine to the pump and experiences combined loads during operation. This study aims to evaluate the structural safety of the turbine shaft geometry under operational loading conditions using the Finite Element Analysis (FEA) method. A three-dimensional shaft model was developed based on actual field measurements and analyzed using SolidWorks Simulation with a torsional load of 6.016 × 10³ Nm calculated from a turbine power of 157.5 kW and a rotational speed of 250 rpm. The shaft material used was SCM4 (AISI 4140). Simulation results show a maximum von Mises stress of 75 MPa with a safety factor of 8.27 relative to the material yield strength. The maximum displacement of 0.4 mm and maximum strain of 2.9 × 10⁻⁴ remain within the elastic range of the material. The results indicate that the shaft design is theoretically safe under static loading; however, indications of wear observed in the field suggest the influence of long-term mechanical degradation during operation.
The Effect of Glazing Cover Material on Box-Type Solar Cooker performance: Pengaruh Bahan Penutup Kaca terhadap Kinerja Kompor Surya Tipe Kotak Muhammad Naufal Bari; Rhakasywi, Damora; Fahrudin
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1828

Abstract

This study compares two types of glass materials applied to a box-type solar cooker, namely low-iron glass and soda-lime glass. Low-iron glass is produced with a reduced iron oxide content, resulting in a higher transparency level compared to soda-lime glass, which affects its optical properties, particularly transmittance. The testing was conducted under two conditions: a stagnation test and a load test using 1 kg of water. The results indicated that the soda-lime glass system was superior, successfully boiling water up to 101.25 °C with a thermal efficiency of 0.48, an F1 value of 0.22, and an F2 value of 0.51. In contrast, the low-iron glass failed to boil the water, as the temperature only reached 79.25 °C, and it did not meet the load test feasibility standard, recording an F2 of 0.13 and an efficiency of 0.25.
Simulation Study of High Performance Thin Film Solar Cell Based of Perovskite n- CdS/p- CH3NH3SnI3 Humaidan, Raed Maher; Falah Mohammed Abed; Ghaith Thaaer Fadhil Al-Doori
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1834

Abstract

Solar cells fabricated of perovskite metal halide have experienced major improvement in the last few years. There is research interest in lead-free perovskite solar cells (PSCs) because lead in lead halide perovskites is believed to be toxic. CH3NH3SnI3 seems to lose ba a good alternative to CH3NH3PbX3. The impact of different parameters on the performance of the perovskite solar cells was learned by us in this paper through the software PC1D simulation. The cell configuration is made of three layers of n- CdS/p- CH3NH3SnI3/p- InP. In this study, I explore the effect of varying CH3NH3SnI3 absorber layer thickness and doping concentration 0.5 to 5 µm and 1015 to 10 -3 without a back surface field (BSF) layer. The n-CdS/p- CH3NH3SnI3 heterojunction was enhanced with a BSF layer to enhance solar cell performance. The effect of the thickness and doping concentration of the Back Surface Field layer (of 0.5 _ 5 )µm and 1015 -1020 cm-3 respectively were explored. The optimal doping concentration and thickness of the p- CH3NH3SnI3 and p-InP layers yielded the highest efficiency η = 24. 78 A/cm2 Jsc 34mA/cm2, Voc=0.81 and FF=90 A. The cell operating temperature was also experimented and the range was deposited between 300k to 400k and the findings revealed that the optimum was at 300k.
Numerical Study of Fluid Flow and Hydrodynamic Forces in a Kaplan Turbine Using Computational Fluid Dynamics: Studi Numerik Aliran Fluida dan Gaya Hidrodinamik pada Turbin Kaplan Menggunakan Computational Fluid Dynamics Fadilah, Dio Muhamad; Prasetia, Adhita; Suryaman, Nia Nuraeni
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1829

Abstract

Indonesia memiliki kekayaan sumber daya air yang besar dengan karakteristik low-head, sehingga turbin Kaplan menjadi teknologi paling sesuai dikembangkan karena efisiensi konversi energinya yang tinggi. Namun, tekanan tidak stabil sering menyebabkan risiko kerusakan serius pada komponen poros turbin akibat beban dinamis yang kompleks. Penelitian ini bertujuan untuk menganalisis karakteristik distribusi tekanan, distribusi kecepatan, dan torsi hidrodinamik pada sistem turbin Kaplan Tarum Barat menggunakan data operasional aktual Perum Jasa Tirta II. Metode Computational Fluid Dynamics (CFD) dengan model turbulensi k-omega SST digunakan untuk mendeteksi verifikasi aliran secara akurat pada kondisi 250 rpm dan debit 2,46 m³/s. Hasil simulasi menunjukkan validitas tinggi dengan nilai error torsi 4,28% antara hasil numerik terhadap data torsi pengukuran. Temuan menunjukkan gradien distribusi tekanan stabil pada permukaan sudu dengan kecepatan aliran maksimal 25,61 m/s. Fenomena tersebut menghasilkan torsi rata-rata 5,739 Nm. Studi ini memberikan referensi kuantitatif bagi peningkatan reliabilitas dan standar perancangan sistem transmisi turbin air di sektor industri .
Optimization of Preventive Maintenance Interval for CMYP Ø50 Guide Bush Based on Wear Progression and Reliability–Maintainability Analysis in Headlining Mold Wijanarko; Wilarso
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1830

Abstract

Guide brushes in the mold headlining system play a crucial role in maintaining the alignment of mold movement and the stability of forming pressure distribution. Dimensional degradation due to wear on these components causes an increase in clearance that can potentially trigger misalignment and product thickness deviation. This study aims to determine the optimal preventive maintenance interval based on the production cycle through the integration of wear progression analysis, reliability maintainability, and total cost function. The method used is a quantitative approach based on mathematical modeling by utilizing actual production data and component dimension measurements. The wear program is modeled linearly against the number of production cycles, then associated with an increase in clearance, product thickness deviation, and a decrease in component reliability function. Optimization of the replacement interval is carried out by minimizing the total cost function that combines preventive costs and the risk of loss due to quality failure. The results show that the guide bush wear rate is 0.99998 mm/cycle which causes an increase in clearance of up to 1 mm in 25 production cycles. This condition results in a product thickness deviation of ±0.2 mm, which is still within the design tolerance limit. Reliability analysis shows an R value of ≈0.3679 at this interval, with a system availability level of 99.53%. Based on the optimization of the total cost function, the optimal preventive maintenance interval is obtained at 25,000 production cycles, which provides a balance between product quality stability and operational cost efficiency. The contribution of this research lies in the development of an integrative model that links the wear progression of precision components with product quality degradation and risk-based maintenance decisions. This approach provides a more representative analytical framework than conventional operating time-based methods, especially for mold alignment components in the automotive manufacturing industry.
Multi-Objective Optimization for Uncertainty Management in Circular Economy: An Empirical Approach to the Yellow Tofu Industry in Kediri Ana Komari; Lolyka Dewi Indrasari
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1831

Abstract

The small and medium-scale tofu industry faces production efficiency and waste management issues that impact economic and environmental performance. This study aims to optimize yellow tofu production by maximizing profits, minimizing raw material waste, and optimizing waste utilization into economically valuable products. The Multi-Objective Linear Programming (MOLP) approach is used to model the production system by considering the limitations of raw materials, production capacity, and working hours. Fishbone Diagram analysis is applied to identify factors causing waste generation based on human, machine, material, method, environment, and management aspects. The optimization results show that the optimal production of yellow tofu reaches 1,194.03 kg/day with an objective value of Rp 7,164,179, where the constraints of working hours and the use of turmeric are in binding conditions. The integration of waste utilization allows tofu dregs to be fully utilized as a by-product of 5.01 kg/day, so that net waste can be reduced to zero. The feasibility evaluation of a circular economy using NPV, IRR, B/C, and Payback Period shows that waste utilization is financially feasible. This research contributes to the formulation of efficient, sustainable, and environmentally friendly tofu production strategies for small and medium industries.
Effect of T6 Heat Treatment on Tensile Strength and Hardness of A356 Aluminum Alloy at 720°C Optimization: Pengaruh Perlakuan Panas T6 terhadap Kekuatan Tarik dan Kekerasan Paduan Aluminium A356 pada Optimasi Suhu 720°C Wawan Budi; Johan Alfian Pradana; Bamban Handriyanto; Nazri Syah Rizan; Saiful Rowi; Ahmad Bazi Syarif
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1835

Abstract

This study aims to analyze the effect of T6 heat treatment on the mechanical properties of A356 aluminum alloy to determine the optimal processing condition. A356 aluminum is widely used in the automotive industry; however, its as-cast condition exhibits limited strength, requiring improvement through heat treatment processes. The research method involves varying T6 treatment temperatures at 690°C, 720°C, and 750°C, followed by tensile testing, hardness testing, and ANOVA statistical analysis. The results show that T6 treatment significantly improves mechanical properties compared to the as-cast condition, with the highest ultimate tensile strength of 28.3 kg/mm² achieved at 720°C. Hardness also reaches its maximum value at this temperature. However, increasing the temperature to 750°C leads to a decline in mechanical properties due to gas porosity formation that degrades microstructural integrity. ANOVA analysis confirms a significant effect of temperature on hardness (F = 287.300; p < 0.001). Therefore, 720°C is identified as the optimum condition for enhancing the mechanical performance of A356 alloy through T6 heat treatment.

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