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Journal of Energy, Mechanical, Material and Manufacturing Engineering
Published by Universitas Muhammadiyah Malang
ISSN : 25416332     EISSN : 25484281     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Journal of Energy, Mechanical, Material and Manufacturing Engineering Scientific (JEMMME) is a scientific journal in the area of renewable energy, mechanical engineering, advanced material, dan manufacturing engineering. We are committing to invite academicians and scientiests for sharing ideas, knowledges, and experiences in our online publishing for free of charge. It would be our pleasure to accept your manuscripts submission to our journal site.
Arjuna Subject : -
Articles 193 Documents
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Modeling and simulation of magnet-coil arrays for vibrational energy harvesting in agricultural electric vehicles Divine Kobbi, Mbanwei; Alombah , Njimboh Henry; Ngwabie, Ngwa Martin
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 2 (2024)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v9i2.36498

Abstract

Electric vehicles have advantages such as reduced maintenance and fuel costs compared to internal combustion engines. However, their limited driving range still hinders their widespread adoption compared to internal combustion engines. Harvesting wasted energies through vibrations in electric vehicles is a good approach to complement the energy of their batteries. Space constraints in electric vehicles require devices with high power output per unit volume. This study aimed to design a novel vibration energy harvesting using the geometrical model for electric vehicles. Different configurations and their performance in maximum flux linkage, electromagnetic coupling coefficient, induced voltage, and generated power were investigated. The modeling, excitement, and analysis were conducted using ANSYS Maxwell software with four configurations under similar conditions. These were the Halbach array with three magnets, one coil, and flat back shield; the Halbach array with three magnets and one coil with a stepped back shield; the double magnet array with two magnets, one coil, and flat back shield; and the fourth one was a double magnet array with two magnets, one coil and stepped back shield. The MATLAB Simulink software was used to obtain further results and power output analysis. The results of the analysis show that the Halbach array with three magnets, one coil, and a stepped-back shield is the best configuration for harvesting energy from vibrations, producing an electromagnetic coupling coefficient of up to 110 Wb/m, a voltage of up to 36 V, and generated power density of 0.13 W/cm. A reasonable increase in output using less volume was obtained compared to the other studies. The energy harvested will be applied in future studies to extend the range of agricultural electric vehicles, reducing farmers’ income spent on fuel and maintenance.
Effect of magnesium addition in aluminum A1100 casting process on its hardness Rigel, Muhammad; Murjito, Murjito; Mamungkas, Mohamad Irkham
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 1 (2024)
Publisher : University of Muhammadiyah Malang

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

Abstract

This study investigated the effect of adding magnesium to the hardness of aluminum A 1100 in the casting process using Rockwell testing. Aluminum A 1100 is known to have relatively low mechanical strength but has good corrosion properties. The addition of magnesium is done to increase the hardness of aluminum A 1100. Aluminum A 1100 samples are made with variations of adding 0%, 2%, 4%, and 6% by weight. Casting is carried out using prepared sand molds, and the resulting A 1100 aluminum specimens are tested by Rockwell testing. The findings could guide industries that use aluminum A 1100 in applications requiring higher hardness, such as automotive or manufacturing. In addition, this research may serve as a foundation for further studies on the effect of magnesium addition on the mechanical properties of aluminum A 1100 using different test methods.
Performance test of oceanic wave power generator with pendulum system Ilmi, Achmad Zidan Bahrul; Mulyono, Mulyono; Sofi’i, Yepy Komaril
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 1 (2024)
Publisher : University of Muhammadiyah Malang

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Abstract

A plentiful oceanic wave leads to the utilization of this energy into electricity. An oceanic wave power generator with a pendulum system is one of the innovations that can generate electricity from the ocean. This research aimed to identify the energy from the oceanic wave power generator with a pendulum system. It was conducted by experimenting with the pendulum rod that spins the gearbox in the generator. It was intended to measure the obtained electric power by variating the pendulum mass with the average oceanic wave speed. The research finding shows that the generator results in a maximum of 33 watts of electric power, while the lowest power is 9 watts with a pendulum mass of 0,6 kg.
The effect of adding borax on the Oxy-Acetylene Welding (OAW) process on tensile strength of ST42 steel Moh. Jufri; Hendaryati, Heni; Nur Subeki; Pramojo, Mita Putri Bambang; Baiq Firyal Salsabila Safitri
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 2 (2024)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v9i2.34988

Abstract

The welding process aims at joining materials, especially metals or thermoplastic for certain purposes. It melts the materials in the joining process. In some cases, such material is difficult to be joined with the welding process. Therefore, an appropriate flux is needed in this process. The effect of adding borax in the welding process of OAW is the focus of this research. The research was conducted using the experimental method of adding 1 gram, 3 grams, and 5 grams of borax to the brass and ST42 steel welding process. Borax was added to aid the adhesion process between brass and steel as both have different properties. This research results in the highest elongation value in 1 gram of borax addition; the elongation is 3.9935 cm. Meanwhile, adding 1 gram of borax also affects the welding joints’ ultimate tensile strength (UTS). It results in the highest UTS value of 9.961779 kN/mm2 among the other weight variations of borax addition. It indicates that the borax addition with proper weight in the welding process affects the joints. Moreover, the borax addition in the welding process influences the elongation values, ultimate tensile strength, and modulus of elasticity of the welding joints.
The implementation of innovative IoT models in machine failure detection and risk mitigation Hendra, Franka; Effendi, Riki; Supriyono
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 2 (2024)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v9i2.34121

Abstract

In the era of Industry 4.0, the integration of advanced technologies like the Internet of Things (IoT) into risk-based maintenance planning systems has become crucial for optimizing operational efficiency. This research explores methods to enhance maintenance decision-making by integrating real-time IoT data with risk-based maintenance models. Traditional risk-based maintenance often relies on historical data, which can be insufficient for responding to dynamic operational conditions. By leveraging IoT's ability to collect continuous, real-time data, this study aims to improve the accuracy and responsiveness of maintenance strategies. The research employs a systematic methodology, including data collection through IoT sensors, data preprocessing, and the development of predictive models using machine learning techniques such as Random Forest and Neural Networks. The results indicate that IoT integration reduces downtime by predicting equipment failures with higher accuracy, leading to a 30% reduction in maintenance costs and a 25% increase in productivity. This study demonstrates the significant potential of IoT in transforming maintenance strategies from reactive to proactive, ultimately enhancing equipment reliability and extending operational lifespan.
Steam requirements and mass balance in digesters and screw presses at palm oil mill Zulfatri Aini; Tengku, Tengku Reza Suka Alaqsa; Sri Basriati
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 9 No. 2 (2024)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v9i2.37043

Abstract

Fresh Fruit Bunches (FFB) are the primary component in Crude Palm Oil (CPO) production. Palm oil mills face challenges in optimizing CPO yield, particularly in reducing oil losses during processing, which affects efficiency and profitability. The pressing station, including the digester and screw press, plays an important role in oil extraction. The digester uses steam to heat and soften the fruit for better oil release, while the screw press performs the mechanical extraction of oil. Insufficient steam can hinder oil separation, leading to increased losses. This research aimed to analyze steam requirements for the digester and evaluate the mass balance of the screw press. Using energy and mass balance methods, the optimal steam requirement was 359,870 kg/hour with a mass balance error of 6.58%. Corrective actions in steam valve settings reduced oil losses to 1.57%, which improved processing efficiency and product quality.
Optimization of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) as an alternative biofuel Ichwan Noor Ardiyat; Noor Rahman; Jarot Wijayanto; A'yan Sabitah; Ahmad Robittah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42340

Abstract

This study aims to investigate the effect of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) and to evaluate its potential as an alternative biofuel. Torrefaction was carried out at 200°C, 250°C, and 300°C for 150 minutes under oxygen-limited conditions, and the resulting char, tar, and gas yields were quantified, while chemical changes were analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing temperature significantly affects product distribution, with the highest char yield (52%) obtained at 250°C and increased gas formation at 300°C. FTIR analysis revealed a progressive reduction of hydroxyl (O–H) and carbonyl (C=O) functional groups, indicating enhanced deoxygenation and carbonization at higher temperatures. These chemical transformations suggest improved thermal stability and fuel quality of the torrefied ironwood. It can be concluded that Eusideroxylon zwageri has strong potential as a renewable biofuel feedstock, with torrefaction at 250°C being the most suitable condition for solid biofuel production.
Comparison analysis of engine performance fueled with B30 Nyamplung biodiesel and Pertadex Moh. Syaiful Anwar; Nurhaji Suprapto Wijono; Dimas Agung Trisliatanto
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.43223

Abstract

Energy conservation has not received sufficient consideration in national energy management. Increasing the country's energy supply. Meanwhile, improving public access has been the main objective of energy management in recent years. Increased use of fossil fuels and the provision of electricity in rural regions have made this possible. This study aimed to determine how the mixture of ethanol, Nyamplung, and diesel oil (B0, B30, B30E10, and Pertadex) affected the physical and chemical properties and performance of a single-cylinder diesel engine. In this study, an experimental method was employed to evaluate the effect of mixing Nyamplung biodiesel with ethanol and to determine the biodiesel composition. The study found that the viscosity and density of liquid fuels affected engine performance. Diesel engines experience incomplete combustion because fuel viscosity decreases with increasing engine temperature. Higher mechanical power had correlated with lower effective power because longer rotations cause greater friction. B30 fuel exhibited higher Specific Fuel Consumption (SFC) after the addition of ethanol. High or low thermal value efficiency was the level of heat contained in the fuel. The addition of 10% ethanol to B30E10 as a fuel mixture is able to produce lower carbon dioxide emissions.
Computational fluid dynamics software based on the artificial compressibility method Yosua Heru Irawan; Daru Sugati; Kristian Hubra Kadu; Syed Ahmad Raza
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42462

Abstract

This study aims to develop a computational fluid dynamics (CFD) software package based on the Artificial Compressibility Method (ACM) for solving incompressible fluid flow problems. CFD is a vital engineering tool that enables numerical simulation of fluid motion. The ACM, introduced to enhance computational efficiency, allows incompressible flows to be simulated similarly to compressible flows, resulting in faster and more stable numerical convergence.  The Finite Volume Method (FVM) was employed to discretize the Navier–Stokes and continuity equations, incorporating an artificial compressibility term. The developed software was validated using two benchmark cases: lid-driven cavity flow and channel flow. In the lid-driven cavity flow test, simulations were conducted at Reynolds numbers (Re) of 100 and 3200, showing excellent agreement with benchmark data from Ghia et al. (1982). For the channel flow case, numerical results were compared with the analytical Hagen–Poiseuille solution for fully developed laminar flow, demonstrating strong consistency. The results indicate that the software accurately reproduces velocity profiles in both laminar and fully developed regimes, while also improving computational speed without compromising accuracy. This development broadens access to CFD technology for a wide range of engineering applications, enabling complex flow analyses with more efficient use of computational resources.
Solar-powered feed chopper for aquaculture: Toward farmer feed independence Qory Hidayati; Aryati Muhaymin Marali; Danar Retno Sari; Yasmin Zulfati Yusrina; Hendra Sanjaya Kusno; Steven Daniel Kussoy; Candra Irawan
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v10i2.42537

Abstract

The dependence on manufacturer feed causes high costs in farm production and, therefore, makes it susceptible to price fluctuations in the feed. This study aims to design, develop, and evaluate a solar-powered fish feed chopper suitable for off-grid aquaculture applications. The method of this study uses an engineering-based approach. It involves mechanical system design, analytical energy requirement calculations, battery sizing with depth-of-discharge considerations, and prototype fabrication. Experimental testing was conducted under solar-assisted and battery-only operating conditions using a 0.5-phase induction motor (370 W). Results showed that a six-hour no-load operation required 2,220 Wh of energy. Considering inverter losses and VRLA battery limitations, the effective safe operating time was limited to approximately three hours without solar input. A PV configuration consisting of three 200 Wp panels with an MPPT charge controller was sufficient to maintain stable daytime operation and sustain battery state-of-charge between 90–100%. The findings demonstrate that the proposed off-grid PV system can reliably support fish feed chopping operations, although system performance is constrained by battery depth-of-discharge and solar irradiance. This study confirms the feasibility of solar-powered feed choppers as a sustainable solution for small-scale aquaculture.

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