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Journal of Mechanical Engineering Learning
Published by Universitas Negeri Semarang
ISSN : 2252651X     EISSN : -     DOI : https://doi.org/10.15294/jmel
Core Subject : Engineering,
Mechanical Engineering
JMEL: Journal of Mechanical Engineering Learning published by the Mechanical Engineering Department, Faculty of Engineering, Universitas Negeri Semarang Indonesia, is a journal that contains scientific articles on mechanical engineering and mechanical engineering learning. Published articles in english by JMEL include the results of original scientific research findings and scientific review articles are new in mechanical engineering learning. JMEL publishes periodically six months.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 17 Documents
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Finite element method based analysis of lower body structural strength on rekarya ev electric car Wibisono, Kristian; Aryadi, Widya
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 2 (2024): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i2.18674

Abstract

In line with current technological developments, the use of electric vehicles is expected to increase due to their environmentally friendly nature—primarily because they produce no exhaust emissions. One of the critical structural components of an electric car is the lower body. The lower body of the Rekarya EV has been specifically designed to accommodate three rows of seating. This study aims to evaluate the structural strength of the Rekarya EV's lower body under static loading conditions by analyzing von Mises stress, displacement, and safety factor values. The analysis was carried out using the Finite Element Method (FEM) through Autodesk Inventor Professional 2020. A static stress analysis was performed using ASTM A36 steel material with three different thickness variations: 1.0 mm, 1.2 mm, and 1.4 mm. The resulting von Mises stress values were 72.88 MPa, 62.24 MPa, and 51.66 MPa, respectively. The corresponding displacement values were 1.366 mm, 1.295 mm, and 1.212 mm. The calculated safety factors were 3.41, 3.99, and 4.8. Additionally, the total weight of the lower body for each thickness was calculated as 88.012 kg, 100.823 kg, and 113.613 kg. The results indicate that all three thickness variations provide adequate safety factors; however, increasing material thickness significantly affects the overall weight of the structure. Therefore, a balance between strength and weight must be considered in the design process.
A systematic literature review of implementation quality control and assurance in Industries Riawan, Awinda
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 1 (2025): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i1.20930

Abstract

Quality management practices are essential for companies seeking a competitive advantage in today's market, with quality control (QC) and quality assurance (QA) playing pivotal roles in ensuring that products and services meet established standards and customer expectations. The integration of these practices with sustainability initiatives has emerged as a critical area of research across various industries, driven by the demand for efficient resource utilization and environmental protection. This paper reviews the significance of QC and QA across these industries, highlighting their impact on operational efficiency, waste reduction, and customer trust. Furthermore, the paper examines the integration of advanced technologies, such as automation and artificial intelligence, in quality management systems, and their potential to improve decision-making and risk management. This review identifies key research gaps and limitations in current studies, emphasizing the need for actionable guidelines and qualitative insights to enhance the implementation of quality management practices. By addressing these gaps, future research can contribute to more effective and sustainable quality management solutions across diverse industries.
Development of honda supra manual transmission system demo made in acrylic to improve students' learning outcomes at muhammadiyah 04 vocational school sukorejo Yogi Kurniawan; Naryanto , Rizqi Fitri; Septiyanto, Angga
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 1 (2025): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i2.21333

Abstract

Based on the results of observations at SMK Muhammadiyah 04 Sukorejo, it is known that there is still no Honda manual transmission demonstration tool which makes it difficult to understand and comprehend the material presented by the teacher, especially in the basic competency of repairing and periodically maintaining the motorcycle manual transmission system. This study aims to develop a motorcycle manual transmission demonstration learning media that is feasible and can improve student learning outcomes. This study uses the Research and Development (R&D) research method with the ADDIE model. The subjects of this study were grade 11 students of TBSM 1 SMK Muhammadiyah 04 Sukorejo. Product trials were carried out at the implementation stage using the trial stage with the One-Group Pretest-Posttest Design model. The results of the media expert assessment obtained a percentage of 82.5% and the material expert with a percentage of 86.45%. The results of the pretest stage test obtained a value with an average of 64.11 and the posttest stage obtained a value with an average of 79.00. The motorcycle manual transmission system demonstration tool is included in the "very satisfying" category based on student perceptions with a percentage of 82.5%. Based on the results of the N-gain test, the motorcycle manual transmission teaching aid was proven to be able to improve students' mastery of competencies in the moderate category (gain value of 0.414 is between 0.7 > N-gain ≥ 0.03), and based on the t-test, the results showed that the average mastery of student competencies was more than KKM 75 (Sig. Value 0.40 > 0.05).
Analysis of diesel engine vehicle emissions using egr with temperature variations Hakim, Fa’iq Taufiqul; Wijaya, M. Burhan Rubai; Abdurrahman; Roziqin, Ahmad
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 1 (2025): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i1.23830

Abstract

This study aims to analyze the exhaust emissions of diesel engine vehicles with and without the use of the Exhaust Gas Recirculation (EGR) system at engine temperature variations of 60℃, 70℃, and 80℃. The study was conducted on a 2008 Mitsubishi L300 Diesel vehicle to measure the effect of EGR on NOx emissions and soot emissions (smoke opacity). The research method used was an experiment with a quantitative approach. Data were obtained by measuring exhaust gas temperature as an indication of NOx emissions and using a smoke opacity meter to measure the level of vehicle smoke concentration. The results showed that the use of EGR was able to reduce NOx emissions, but increased soot emissions. The higher the engine temperature, the NOx emissions tended to increase both in vehicles with and without EGR. Conversely, soot emissions decreased along with increasing engine temperature. The conclusion of this study is that the EGR system is effective in reducing NOx emissions but has side effects in the form of increased soot emissions. Therefore, optimization of EGR technology needs to be combined with other strategies to reduce the negative impact on air quality.
Energy Conversion Environmentaly Friendly Solutions To The Global Energy Crisis zaki, kaka ibnu; Nugraha, Firza Wahyu; Saputra, Ryan Dhania Hanafi; Darmawan, Yogi Dwi; Mutaqin, Moh Zainul; Yulianto, Fahmi Naufal
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 1 (2025): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i1.7442

Abstract

The global energy crisis has become one of the major challenges facing the world today. The increasing demand for energy, limited fossil fuel resources, and negative environmental impacts are driving the need to seek sustainable and environmentally friendly energy solutions. Renewable energy conversion, such as solar, wind, hydroelectric, biomass, and geothermal, offers great potential as an alternative source of clean and renewable energy. This is literature review studdy. This article explores the important role of renewable energy conversion in addressing the global energy crisis and mitigating climate change. By analyzing the technology, policies, economic, social, and environmental aspects related to renewable energy conversion, this article highlights environmentally friendly solutions that can support a sustainable energy transition and ensure future energy security. Furthermore, this article discusses the challenges and opportunities in integrating renewable energy into the energy system, as well as the importance of public participation and co-ownership models in renewable energy projects.
Development of interactive learning media using smart apps creator on electrical system of light vehicles in vocational high schools Al Farouqi, Sofyan; Hadromi; Widjanarko, Dwi
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December (In Progress)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.31176

Abstract

This study aims to develop and evaluate the feasibility and effectiveness of interactive learning media based on Smart Apps Creator (SAC) for the topic of lighting and signaling systems in light vehicles, intended for Grade XI students of the Light Vehicle Engineering Program at SMK Negeri 2 Salatiga. The background of this research stems from low student achievement and the limited use of engaging instructional media at SMK N 2 Salatiga, which has resulted in students having difficulty understanding the electrical system material. This study employed a Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The developed media underwent validation by subject matter experts and media experts, receiving "highly feasible" ratings with feasibility percentages of 90.25% from the media expert and 88% from the subject matter expert. The effectiveness was tested through pretest and posttest evaluations analyzed using the N-Gain test. The N-Gain score from 34 students yielded an average of 0.324, which falls into the "moderate" category. It can thus be concluded that the learning media based on Smart Apps Creator provided to students is moderately effective in improving their learning outcomes.
Performance Testing of a Multicylinder Diesel Engine Using Antioxidant Bio-Oil Additives from Moringa Oleifera Leaf Pyrolysis Juliyono, Jeri; Maulana, Sonika; Naryanto, Rizqi Fitri; Septiyanto, Angga
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December (In Progress)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.32271

Abstract

Crude oil reserves are steadily depleting. One viable alternative is the use of biodiesel fuel in diesel engines. However, a major drawback of biodiesel is its susceptibility to degradation due to low oxidative stability. Antioxidants are compounds that inhibit or slow down the oxidation process by preventing the formation of oxidants or reducing the propagation of free radicals. This study aims to investigate the effect of adding antioxidant additives derived from Moringa oleifera bio-oil, produced through pyrolysis, to B30 biodiesel fuel at concentrations of 0, 500, 1000, and 1500 ppm on the performance of a multicylinder diesel engine. A quantitative approach was employed using an experimental method, and data analysis was conducted using descriptive analysis. The results showed that fuel consumption decreased with the addition of Moringa oleifera antioxidants, with reductions of 5.31%, 6.66%, and 7.08% at 500 ppm, 1000 ppm, and 1500 ppm, respectively, at an engine speed of 2500 rpm. The highest torque was achieved with 1000 ppm of Moringa oleifera antioxidant at 2728 rpm, reaching 111.9 Nm (an increase of 4.48%), while the highest power output was also obtained at 1000 ppm, reaching 70.9 HP at 5100 rpm (an increase of 3.2%).

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