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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 
Design and analysis of pneumatic based automatic unwind splicing on a rotogravure machine Rahmadhi, Arif; Sumbodo, Wirawan; Saputro, Danang Dwi; Musyono, Ari Dwi Nur Indriawan; Setiadi, Rizki
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 1 (2024): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i1.3179

Abstract

The aim of this design is to obtain a design for the tension control system and the automatic system, which are the two mechanisms in the unwind, accompanied by an estimate of the design costs. The design process was carried out using the French method. This method is often used for new products or still has few competitors, with the advantage of being able to facilitate the selection of product concept variants efficiently when designing products that have many limitations in terms of variants. Based on the validation results, the second concept design used is a tension measurement mechanism using a load cell and speed regulation using a magnetic powder brake. The results of numerical calculations show that the maximum rotation torque value of the printed material is 13.6 Nm, the maximum speed is 628.24 rpm, and the maximum stress value measured is 206.122 N. Based on the validation results, the second concept design is a movement mechanism that uses four pneumatic cylinders to move the frame and cutter. The results of numerical calculations show that the time required to cut the material is 0.24 seconds, and the time required to return to its original position is 2.25 seconds. The amount of air required for one cutting cycle is 37.83 ×10-6 m3/s. The estimated cost of designing the overall unwind unit based on the components used is IDR. 74,873,625.
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.
The effect of cutting speed on the roughness level of low carbon steel cutting results using the trulaser 3030 machine Amron, Husni; Roziqin, Ahmad
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 1 (2024): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i1.5503

Abstract

This research aims to determine the effect of variations in cutting speed on the roughness value of low carbon steel cutting results using CNC Laser Cutting TruLaser3030. This research uses experimental methods and descriptive statistical data analysis techniques and diagrams to present data on the measurement results of research specimens using cutting speeds of 2520 mm/minute, 2205 mm/minute, and 1890 mm/minute. Roughness testing was carried out using Surface Roughness Mitutoyo SJ-210. The results of the research produced data showing that the higher the cutting speed, the roughness value increases and the lower the cutting speed, the roughness value will decrease. And if the cutting speed is too high then the material cannot be cut. The lowest roughness value, namely 8.46µm, was at a cutting speed variation of 1980 mm/minute. The highest roughness value, namely 23.63µm, occurs at a cutting speed variation of 2520 mm/minute.
Correct use of Indonesian terms for 4-stroke motorbikes: a solution to make it easier to understand the working Hasna Nailah Luthfiyah; Ruhiyat, Hamzah Salman; Faisal, Muhammad Sabdha; Saputra, Tanu; Rizkyanfi, Mochamad Whilky
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 1 (2024): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i1.5523

Abstract

This research aims to offer concrete solutions regarding the appropriate use of terms in the context of 4-stroke motorbikes, especially regarding their working mechanisms. The methodology used in this research is qualitative. Interviews with teachers, mechanics, and students were used as a way of collecting data. The use of Indonesian terms in understanding the working mechanisms of 4-stroke motorbikes has a significant impact on teachers, workshop mechanics, and students. This has the potential to increase understanding, engagement, effective communication, and skill development. Ultimately, this will improve the quality of teaching, workshop services, and student understanding in the automotive field.
Literature review of modification of u-type savonius wind turbine rotor for low wind speeds Alfatih, Muhammad Danang Ilham; Adiwibowo, Priyo Heru; Saptono, Renaldi Prima; Fani, Rayhan Aulia Iman; Pambudi, Dimas Ridho; Ciptafarizi, Muhammad Zardana; Setiawan, Kharis
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 1 (2024): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i1.5845

Abstract

A wind turbine is one of the tools that can be used to convert wind energy into electrical energy. The increasing need for electrical energy in Indonesia and fossil fuels are running low, so alternative to fossil fuels are needed. One of them is a wind turbine that can convert wind energy into wind mechanical energy into kinetic energy in the form of turbine blades that are used to rotate generators that can produce electricity. Indonesia is an area that has low wind speed. This study aims to analyze the effect of U-type savonius wind turbine rotor modification at low wind speeds. The research method used is a qualitative method in which we conduct library research on various literature to examine the effect of turbine rotor modification. The results obtained are the addition of a guide vane or deflector and the increase in the number of blades on the turbine rotor can improve the performance of the U-type savonius wind turbine.
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.
Effect of using a high performance-low pollution muffler (hplpm) with catalytic converter on fuel consumtion and performance of 110cc Susanto, Nugroho Fajar; Roziqin, Ahmad; Naryanto, Rizqi Fitri; Mujaki, Ahmad
JMEL : Journal of Mechanical Engineering Learning Vol. 13 No. 1 (2024): June
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v13.i1.7934

Abstract

The increse in the number of motorcycles to fulfil mobility is domianted by matic type. Over time the vehicle will experience a derease in performance and appearance, triggering modification. the purpose of this study was to determine the difference in motorcycle performance with the use of standard exhaust, HPLPM 2 + catalytic converter and HPLPM mod + catalytic converter. This reaserch was conducted with a quantitative research meode with an experiemental approach, performance testing test data at engine speed of 3000-9000 rpm. Engine temperature 80 degree with pertamax fuel ocatane 92. In this study, HPLPM mod + catalytic converter produces 12,23 N.m of torque at 4500 rpm, the highest power produced by HPLPM 2 + catalytic converter 8,27 Hp at 5500 rpm. exhaust HPLPM mod + catalytic converter is able to maintain power at high rpm 7,70 Hp at 8250 rpm.
Development of android learning media for lubrication system competency in the concentration of light vehicle engineering skills at ma'arif nu 1 ajibarang vocational high school Pradana, Akbar Surya; Bunyamin; Kurniawan, Adhetya; Khoiron, Ahmad Mustamil
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.i1.16401

Abstract

This research aims to develop Android learning media on lubrication system competency. The purpose of this research is to create appropriate learning applications according to experts, determine the effectiveness and efficiency of the media, and determine the response of teachers and students to the media created. This research used the ADDIE development model. This research used a pre-experimental design in the form of a one group pretest-posttest design which was carried out at the Concentration of Light Vehicle Engineering Expertise at SMK Ma'arif NU 1 Ajibarang. The research results showed that Android learning media received a score from media experts of 85.16% in very worthy category and material experts received a score of 88.97% in very worthy category. There is significant differences between the result of pretest and posttest in experiment class (sig. 2-tailed 0.000 < 0.05) and also in control class (sig. 2-tailed 0.000 <0.05).  Android media can improve student learning outcomes in experimental classes with an average percentage increase of 62.15% in quite effective category. Meanwhile, the control class that did not use Android media obtained an average percentage increase of 25.62% in the Ineffective category. There was no time efficiency in this research. The media received a teacher response of 95.45% in very good category and a student response of 77.41% in the "Good" category.

Page 1 of 2 | Total Record : 14

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