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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 14 Documents
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Search results for , issue "Vol 11 No 1 (2026): In Progress" : 14 Documents clear
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 Komari, Ana; Indrasari, Lolyka Dewi
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.

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