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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 14 Documents
 1   2 
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 (In Progress)
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 (In Progress)
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 (In Progress)
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.

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