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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 5 Documents
 1 
Search results for , issue "Vol. 13 No. 2 (2024): December" : 5 Documents clear
The effect of additive addition to fuel with variations in preheating and water coolant on multi-cylinder diesel engine performance Faisal Abdul Aziz; Maulana, Sonika; Naryanto, Rizqi Fitri; Hidayat, Hanif
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.i2.5076

Abstract

Diesel engines are essential for transporting heavy loads, requiring significant engine power. This study aims to evaluate the effect of adding PTT (diesel fuel conditioner) additives to Dexlite fuel, focusing on mixtures of D0, D1, and D2. Additionally, variations in fuel pre-heating and engine cooling system fluids are examined. This research employs an experimental approach with descriptive analysis. The findings indicate that the optimal torque occurs with the D2 mixture, achieving 136.57 N·m at 2267 rpm with standard coolant, 152.03 N·m at 2100 rpm with a 50%:50% fluid ratio, and 160.70 N·m at 2033 rpm with a 30%:70% fluid ratio, all without pre-heating. The optimal power values for the D2 mixture are 74.60 HP at 4600 rpm with standard fluid, 75.23 HP at 4100 rpm with a 50%:50% fluid ratio, and 78.03 HP at 4000 rpm with a 30%:70% fluid ratio, also without pre-heating. The average results show that the D1 and D2 mixtures improve torque values by 0.77% and 4.75%, respectively, and enhance power by 0.19% and 1.53% compared to pure Dexlite. In contrast, pre-heating at 50°C, 60°C, and 70°C resulted in a decrease in torque of 1.00%, 2.26%, and 3.62%, respectively, and a reduction in power of 0.56%, 2.29%, and 4.79% compared to normal temperature conditions.
Literature study: potential of additional technology on conventional motorcycles on reducing the impact of exhaust gas emissions on the environment Waskitho, Wiji Ninggar; Afif, Ahmad Fauji; Wijaya, Alfin Cakra; Alvian Nurdiansyach, Muhammad; Hidayatulloh , Putra Ragil; Arianto, Faiz Daffa
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.i2.7357

Abstract

Motorbikes in Indonesia reached 125,305,332 units or 84.5% of total motorized vehicles. Indonesia ranks 26th in the country with the highest level of air pollution in the world. Motor vehicles produce 70-80% air pollution and industry 20-30%. The CO and HC produced are not good for the environment. Reducing exhaust emissions becomes very important by identifying effective additional technologies. The research method used in this research is the literature review method by collecting information and data using various library materials. The results of the literature review show that the addition of technology can reduce exhaust gas emissions in the form of CO and HC. By adding additional technology to motorbikes, of which there are 125,305,332 units or 84.5%, it can reduce the level of air pollution in Indonesia. The use of additional technology on conventional motorbikes has great potential to reduce exhaust emissions which have a negative impact on the environment, but further research is needed to identify effective and economical technology.
Potential utilization of renewable fuels for general internal combustion cars in the 2026 f1 engine regulations Darmayasa, Putu Wisnu; Syah, Fiqih Firman; Hidayat, Wahyu; Fadilah, Yudan Lutfy; Supralan, Irlan; Rachman, Muchammad Irfan
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.i2.7379

Abstract

In the automotive sector, which produces over 60-70% of global pollution emissions, the world faces difficulties in making the switch from fossil fuels to environmentally friendly renewable energy sources. Technology has advanced significantly, and companies such as Toyota and FiA are working to improve competitiveness and attract more manufacturers to produce hybrid cars. Reducing environmental impact and greenhouse gas emissions is the goal of the Formula 1 project, which partners with ARAMCO, one of the world's largest mining companies. Using the methodology of reviewing literature on energy-efficient fuels and adapting to Formula 1 vehicle regulations, with a special emphasis on hybrid strategies, to achieve net zero emissions by 2050. Research on the use of synthetic materials in fuels such as ethanol, ethanol, butanole, dimethyl methacrylate (DMM), and oxymethylethyl (OME) 3-5 has shown promising results in reducing greenhouse gas emissions. The transition to renewable energy sources is essential to reduce global pollution.
Utilization of solar thermal energy as a supplier of electric car batteries in indonesia Ambia, Yahya Chairil; Fayisa, Fadhil; Rahmah, Ainun Nur; Alfian, Aghista; Ahmadi, Arga Farid
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.i2.7504

Abstract

Utilizing solar thermal energy as an energy source to supply electric car batteries in Indonesia is a big solution for reducing carbon gas emissions and the use of fossil fuels. This research aims to provide an alternative energy source for electric vehicle batteries and apply design concepts to electric vehicles in Indonesia. The method applied is a qualitative approach with literature analysis and literature study. The research results show that in a comparative analysis of the use of solar thermal energy in electric cars with conventional vehicles that use fossil fuels, there is a significant difference in reducing carbon emissions. The results of the analysis also strengthen the argument about the superiority of electric cars in terms of environmental friendliness so that the design concept for implementing solar thermal energy in electric vehicles in Indonesia becomes very effective to implement.
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.

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