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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 155 Documents
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Efficiency Analysis of Energy-Saving Inverter Generators for Remote Areas: Analisis Efisiensi pada Generator Inverter Hemat Energi Listrik untuk Daerah Terpencil Riza Muharni; Aggrivina Dwiharzandis; Dycthia Septi Kesuma
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 9 No 2 (2024): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v9i2.1712

Abstract

Kebutuhan akan energi listrik membuat manusia mencari alternatif untuk memenuhi kebutuhan energi listrik, salah satunya dengan merancang generator sebagai energi alternatif untuk daerah terpencil yang tidak dapat terjangkau jaringan dari PLN. Dari permasalahan di atas, peneliti mencoba menganalisis efisiensi pada generator inverter hemat energi listrik untuk daerah terpencil. Agar putaran pada generatator stabil dan tidak mengalami beban lebih digunakan flywheel, di mana untuk membantu flyhwheel ini ditambah motor DC yang berfungsi agar flywheel tidak mengalami penurunan putaran saat generator mengalami beban puncak. Tujuan dari penelitian ini adalah menganalisis efisiensi generator inverter untuk dapat memenuhi kebutuhan energi listrik masyarakat daerah terpencil dengan harga terjangkau dan ramah lingkungan. Hasilnya efisiensi generator inverter adalah 92,41% dalam kondisi stabil dan dapat digunakan sebagai pengganti energi listrik untuk daerah terpencil yang belum terjangkau aliran listrik PLN.
The Effect of Motorcycle Wheels (Original Equipment Manufacturer) Reconditioning Process on Mechanical Properties and Microstructure Nasution, Ahmad Kafrawi; Alfindo; Sunaryo
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 9 No 2 (2024): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v9i2.1714

Abstract

Wheels are an essential component of a vehicle. Material damage or failure on casting wheel-type wheels is primarily because these wheels receive a reasonably hard impact load due to uneven road conditions or potholes. This condition makes the wheels unable to function normally, and components must be replaced. Given the relatively high cost of replacing wheels, several options are offered to vehicle owners (consumers) to have their wheels reconditioned. This study aims to analyze the effect of the reconditioning process on the mechanical properties and microstructure of the casting wheel material. The sample material is taken from the Original Equipment Manufacturer (OEM) wheel casting wheel in the Disk section for impact testing, Rim for hardness, and microstructure tests. The results are that the reconditioning process affects the mechanical properties and microstructure of the original equipment manufacturer (OEM) alloy wheel material. The decrease in hardness value was 68.86 HBW to 61.59 HBW from the conditions before and after reconditioning. The impact test results where the impact energy absorption is greater after reconditioning is 29.24 J, and the average impact value for wheel specimens after reconditioning is 0.2902 J/mm2. The impact energy value before reconditioning is 7.87 J, and the average impact value is 0.0973 J/mm2. The microstructure obtained is hypereutectic, and the reconditioning process has little effect on the dendritic structure.
Effect of Co-firing Using Biomass Variation to Maintain Biomass Feedstock in Coal-Fired Power Plants: Pengaruh Cofiring Menggunakan Variasi Biomassa untuk Menjaga Feedstock Biomassa di Pembangkit Listrik Tenaga Uap Batubara Muzhoffar, Dimas Angga Fakhri; Gultom, Enrico; Prasetyo, Ervan Ari
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 9 No 2 (2024): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v9i2.1727

Abstract

Pembakaran bahan bakar batubara pada pembangkit listrik secara signifikan menyumbang emisi karbon dioksida (CO2), yang berperan dalam pemanasan global dan perubahan iklim. Metode co-firing digunakan di Pembangkit Listrik Tenaga Uap (PLTU) sebagai strategi untuk mengurangi ketergantungan pada batubara sebagai sumber energi utama. Masih diperlukan identifikasi lebih lanjut mengenai potensi penerapan co-firing biomassa dalam skala yang lebih luas dan untuk jangka waktu yang lebih panjang. Penelitian ini bertujuan untuk mengevaluasi berbagai jenis biomassa sebagai bahan bakar co-firing dari segi performance, emisi, dan biaya dengan cara uji laboratorium dan uji bakar langsung. Biomassa yang dipakai adalah sawdust, sekam padi, cocopeat, dan Bahan Bakar Jumputan Padat (BBJP). Hasil dari pengujian didapatkan bahwa seluruh biomassa yang diuji masih aman pada segi performance, serta menurunkan emisi gas buang, dan menghemat Biaya Pokok Produksi (BPP) Emissions of carbon dioxide (CO2) resulting from the burning of coal fuel in power plants are a major contributor to global warming and climate change. Co-firing is employed in Coal-Fired Power Plants (CFPP) as a precautionary measure to decrease reliance on coal as the predominant energy source. The possible deployment of biomass co-firing on a bigger scale and for the long term still requires more identification. Through laboratory testing and direct combustion tests, this project intends to assess the performance, emissions, and costs of several types of biomass as co-firing fuel. Seedust, rice husks, cocopeat, and Solid Refuse Fuel (SRF) are among the biomass materials used. All biomass kinds evaluated were found to be safe in terms of performance, reduce exhaust gas emissions, and lower Basic Production Costs (BPP), according to the test report.
A Briquette Characteristics of Cocoa Shell Charcoal and Rice Husk Charcoal Mixtures on Briquette Quality : Karakteristik Briket Campuran Arang Kulit Kakao dan Arang Sekam Padi Terhadap Mutu Briket Aulia, Yuliatin; Muliatiningsih; Karyanik; Muanah; Ahmad Akromul Huda
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 9 No 2 (2024): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v9i2.1729

Abstract

Biomass energy is produced by converting solid raw materials into a more useful compressed form known as briquettes. This study aims to examine the effect of varying compositions of charcoal briquettes using a mixture of cocoa shells and rice husks on the briquette characteristics. The experimental method employs a Completely Randomized Design with four treatments: P1 = 100% cocoa shells, P2 = 75% cocoa shells + 25% rice husks, P3 = 25% cocoa shells + 75% rice husks, and P4 = 100% rice husks. The study finds that the lowest moisture content is in P3 (8.01%), the lowest ash content is in P3 and P4 (4.1% and 3.8%, respectively), the highest calorific value is in P1 (3,658 cal/g), the longest ignition time is in P3 (50 minutes), and the best hardness is in P2 (785.95 N). Based on the results, the best treatment is P3, which achieves a moisture content of 8.01%, ash content of 4.1%, and the longest burning time of 50 minutes.
Analysis of Pitch Angle Optimization on Horizontal Axis Wind Turbine to Increase the Coefficient of Power (Cp) Value by Simulation and Experiment: Analisis Optimasi Sudut Pitch pada Turbin Angin Sumbu Horizontal untuk Meningkatkan Nilai Coefficient of Power (Cp) Secara Simulasi dan Eksperimental Hardi, Witono; Mohammad Muzni Harbelubun; Tri Suyono; Dimas Putra Wardani
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Energi terbarukan merupakan isu yang sangat penting pada saat ini. Penggunaan pembangkit listrik berbahan bakar fosil harus dikurangi secara sistematis agar tidak memberikan pencemaran lingkungan. Turbin angin merupakan salah satu pembangkit listrik energi terbarukan. Namun demikian penelitian tentang turbin angin harus senantiasa ditingkatkan karena turbin angin memiliki efisiensi yang terbatas. Tidak seperti mesin pada umumnya yang mana efisiensinya cukup tinggi. Penelitian ini bertujuan melakukan optimasi sudut pitch pada turbin angin sumbu horizontal untuk meningkatkan nilai coefficient of power (Cp) secara simulasi dan eksperimental. Optimasi ini harus dilakukan agar gaya lift yang terjadi pada bilah turbin angin sumbu horizontal memiliki nilai optimum dengan memperhatikan gaya drag yang terjadi. Sudut pitch pada turbin dibuat bervariasi dari posisi dekat hub sampai dengan posisi tip. Ada tiga jenis variasi yang dilakukan yaitu 200-00, 250-50 dan 300-100. Simulasi dilakukan dengan software Qblade pada tiga jenis variasi itu kemudian dilakukan eksperimen di laboratorium. Hasil simulasi dan eksperimen menunjukkan pada variasi 20-0 memiliki efisiensi paling tinggi dibanding yang lain. Hasil ini merupakan rekomendasi pada proses pembuatan bilah turbin angin sumbu horizontal.
Optimization of Steam Methane Reforming Process Through Addition of Hydrogen Gas to Hydrogen Plant in Oleochemical Industry: Optimasi Proses Steam Methane Reforming Melalui Penambahan Gas Hidrogen pada Hydrogen Plant di Industri Oleokimia Desfitri, Erda Rahmilaila; Ansyah, Zulfebri; mardian; Desmiarti, Reni
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1742

Abstract

Steam Methane Reforming (SMR) merupakan teknologi produksi hidrogen yang beroperasi pada suhu 750-900°C menggunakan katalis berbasis nikel dengan sifat sangat endotermik. Penelitian ini mengkaji pengaruh penambahan hidrogen pada umpan sebagai alternatif optimasi proses di PT Ecogreen Oleochemicals Batam, merespons perubahan komposisi gas alam dari 86% menjadi 82% metana dan peningkatan etana-propana. Perubahan ini menyebabkan ketidakstabilan proses dan pembentukan karbon yang berlebih, mengakibatkan deaktivasi katalis ketika peningkatan rasio steam-to-carbon tidak memungkinkan karena keterbatasan operasional. Hasil penelitian menunjukkan korelasi antara suhu reformer, konsumsi bahan bakar NG, dan yield produk. Penambahan hidrogen terbukti efektif mencegah pembentukan karbon dan mempertahankan stabilitas proses. Studi ini memberikan solusi praktis untuk optimasi produksi hidrogen melalui keseimbangan penambahan hidrogen, suhu reformer, dan efisiensi bahan bakar.
Windshield Damage Analysis on ATR 42/72-600 Aircraft at PT. DEF Wilarso, Wilarso; Indra Gumilar; Hilman Sholih; Asep Saepudin
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1750

Abstract

Windshield damage on ATR 42/72-600 aircraft at PT. DEF has caused operational disruptions, including flight delays, increased maintenance costs, and potential safety risks. Repeated damage to the Windshield is caused by various factors, namely inspection and maintenance errors, improper installation procedures, damage to the heating system or pressure distribution, glass material degradation, and exposure to extreme weather and UV rays. In this study, the analysis was carried out using a quantitative method with a fishbone diagram to identify the main causes of damage and appropriate mitigation steps. The results of the analysis showed that the main factors contributing to the damage were errors in inspection, installation errors, and material degradation. After implementing mitigation steps such as improving technician training, revising maintenance procedures, and improving material selection, there was a significant decrease in the frequency of Windshield damage. An indication of the success of these mitigation steps can be seen from the repairs carried out during January to June 2024 which succeeded in reducing damage and rejects on the Windshield by 40% compared to 2023, improving the quality of maintenance, inspection and material durability. In terms of maintenance costs for spare parts, there is a decrease in spending on purchasing spare windshields, namely USD 15,375 (PPG Inc.) x 10 units = USD 153,750 in 2023 to USD 21,915 (Saint Gobain) x 3 units = USD 65,745 in 2024 (June), which is 42% until mid-2024. This step increases operational reliability, cost efficiency, flight safety, and employee productivity, customer satisfaction also increases along with reduced flight delays and cancellations due to technical problems. Overall, the study succeeded in reducing Windshield damage and increasing the company's operational efficiency and reliability
Methods and Characteristics of Quality Control of Composite Materials Nuriddin, Sharipov; Farmanovich, Rajabov
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i1.1752

Abstract

In modern industry, the demand for high-quality and reliable composite materials is increasing day by day. Ensuring the required operational properties of these materials directly depends on the methods and characteristics of their quality control. This article provides detailed information on the main and general directions of modernization programs adopted in our country, including the improvement of standard requirements, innovative, convenient, and at the same time high-performance methods of quality control and testing of composite materials. In particular, special attention is paid to the introduction of modern equipment and technologies, as well as the effective use of local raw materials and production capabilities[1,4]. Today, the development and improvement of non-destructive testing methods, precision measurement technologies, and automatic quality control systems for composite materials is becoming increasingly important. The use of ultrasonic, radiographic, thermal, optical, and electromagnetic control methods makes it possible to detect internal defects in materials, evaluate their physical and mechanical properties, and monitor the stability of technological processes. In addition, the introduction of digital technologies, artificial intelligence, and modern software complexes ensures the objectivity and accuracy of control results[2,3]. The article also analyzes international experience in ensuring the quality and reliability of composite materials, the role of certification and standardization processes, and the importance of creating regulatory frameworks adapted to the requirements of global markets. As a result, the formation of a comprehensive quality control system covering all stages — from raw material selection to final product testing — is of great importance in increasing the competitiveness of domestic composite materials and expanding their application fields
Tensile Strength and Microstructure Analysis of HDPE and PP Plastic Waste-Based Composites with Cassava Pulp Filler: Analisis Kekuatan Tarik dan Mikrostruktur Komposit Berbasis Limbah Plastik HDPE dan PP dengan Filler Ampas Singkong Wawan Trisnadi Putra; Nanang Suffiadi Akhmad; Munaji; Kuntang Winangun; Arie Mastiko Aji
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

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Abstract

Waste is unused material from human or industrial activities. High Density Polyethylene (HDPE) is a safe plastic, while Polypropylene (PP) is a recyclable thermoplastic, potential as a matrix in composite particle boards. Specimen testing includes tensile tests and macro-microstructural analysis. The highest tensile strength, 23.642 MPa, was found in 100% HDPE composition. A blend of 60% HDPE, 30% PP, and 10% cassava pulp reached 16.026 MPa. In contrast, the lowest strength, 4.420 MPa, was in 60% PP, 35% HDPE, and 5% cassava pulp. Increasing HDPE boosts material strength due to its strong and flexible mechanical properties, but too much cassava pulp weakens it. Macro analysis showed air cavities in the specimen's center, while micro analysis revealed HDPE and PP did not mix homogeneously, with cassava pulp more mixed in PP.
Analysis of Power Transformer Core Retaining Plate Damage During Ship Transportation Using Response Spectrum Method: Analisis Kerusakan Pelat Penahan Inti Transformator Daya Saat Transportasi Kapal Laut Menggunakan Metoda Response Spectrum Asep Dharmanto; Wilarso, Wilarso; Asep Saepudin; Djoko Wahyu K; Achmad Husen
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Inti transformator daya diletakan di dalam tangki dengan kondisi pressfit 4 sisi di bagian dasar tangki dan 4 bagian sisi atas ditopang dari 4 arah terhadap gerakan longitudinal - transversal kemudian 2 pedestal atas inti transformer ditekan dengan tutup tangki di bagian bawahnya. Pada waktu transportasi di laut transformator ini mengalami impak yang terekam sebesar 4.1g, kemudian dengan penyidikan visual terlihat lepasnya pelat penahan dan inti transformator mengalami pergeseran dan kerusakan sehingga transformator harus dimanufaktur kembali di pabriknya. Analisa dinamika menggunakan metoda elemen hingga (finite element method) diperlukan untuk mengetahui apakah kegagalan penopang sudah terjadi di atas nilai percepatan 1g, sehingga nilai 4.1g adalah benturan inti transformator ke tangkinya. Pemodelan dibuat 3D shell wall modeling orisinil untuk penopang dan tangki, sedangkan model inti transformator bentuknya disederhanakan menjadi kotak shell untuk memudahkan meshing. Parameter input menggunakan High Required Response Spectrum 0.5g dari IEEE std 693-2005 sedangkan parameter dinamik yang diukur adalah besarnya ragam getar, fenomena resonansi dan tegangan (stress) pelat. Hasil data analisa dinamik dengan menggunakan metoda elemen hingga yaitu transformator mengalami resonansi dengan dek kapal, atau bila terjadi impak di badan kapal akibat goyangan ombak di percepatan di atas 1g maka pelat penahan telah mengalami tegangan di atas kekuatan tariknya (Tensile Strength).

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