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INDONESIA
JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN
Published by Universitas Negeri Yogyakarta
ISSN : 25487590     EISSN : 25487590     DOI : -
Core Subject : Education, Social, Engineering,
Education Mechanical Engineering Social Sciences
Jurnal Dinamika Vokasional Teknik Mesin (JDVTM) is published by the Department of Mechanical Engineering Education, Faculty of Engineering, State University of Yogyakarta. The journal is published twice a year in April and October. Each publication contains articles comprising high quality theoretical and empirical original research papers, review papers, and literature reviews. The scope of study of this journal includes mechanical engineering education, technology and vocational education, learning and curriculum development, learning method development, and learning media. All of the fields study, particularly in mechanical engineering vocational and education. The articles submitted should be attended to the particular topics above.
Arjuna Subject : -
Articles 185 Documents
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STUDY OF VOCATIONAL QUALITY ASSURANCE PERFORMANCE IN PREPARATION FOR SCHOOL SELF-EVALUATION IN THE COVID-19 PANDEMIC ERA Arifin, Zainal; Widodo, Syukri Fathudin Achmad; Wiyono, Giri; Sutikno, Agus; Darmono, Darmono
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.73776

Abstract

This research is based on the results of initial observations and field observations, such as: (1) the quality of SMK graduates is still low, especially with the current world problem, namely the COVID-19 pandemic. (2) there are still some educational quality standards that need to be improved and even improved their achievements. (3) many vocational high schools have implemented a school quality assurance system, but why is the quality of their graduates still low. The purpose of this study is to determine the assessment of school principals, teachers, school committees, and vocational students to photograph the efforts made by vocational quality assurance, especially in preparing the School Self Evaluation (SSE) as the main capital in the accreditation activities of the school concerned.The research method used is the descriptive quantitative research method. The research population is Vocational High School, while the sample is taking 4 Vocational High Schools that have implemented a Quality Assurance System, especially QMS ISO 9001:2008 or QMS ISO 9001:2015, such as several Vocational High Schools located in the Province of D.I. Yogyakarta and Central Java. Research data were collected based on the results of the distribution of questionnaires (instruments), interviews, observations, documentation studies, and Focus Group Discussions (FGD). The filler of the research instrument is the principals, teachers, school committees, and the concerned vocational students. The research data were analyzed descriptively quantitatively to see how far the level of achievement of the eight National Education Standards (NES) that had been set in the RPS.The results of this study are: (1) schools in implementing a school quality assurance system through their SSE have used four stages, consist of standard-setting, standard fulfillment, continuous evaluation, and quality improvement. (2) schools have taken correct and appropriate steps in achieving their vision and mission based on the formulated SPMI guidelines, (3) schools have implemented eight NESs starting from standards: graduates, content, process, educational assessment, educators and education personnel, educational facilities and infrastructure, education management, and financing standards properly. (4) each vocational high school has the same or different strategies and methods in achieving the school's vision and mission.
THE PIPE DIAMETER EFFECT ON HEAT TRANSFER OF HELICAL COIL HEAT EXCHANGER IN THE SOLAR WATER HEATER STORAGE TANK Mustikaningtyas, Andhita; Sihana, Sihana; Wijayanti, Ester; Riyandi, Naufal
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72714

Abstract

Solar thermal collectors are widely applied in various areas; one of them is solar water heating system. Inside the solar water heating system, there is a heat exchanger system located on thermal storage tank. It needs to develop the most efficient heat exchanger with some limited installation area. Helical coil heat exchanger is chosen as an alternative for saving the installation space by the coil helix geometry. The main difference between the helical heat exchanger and shell and tube heat exchanger is the geometry. This geometry causes differences in heat transfer process, as a result of the secondary flow in the fluid. This study analyzed the effect of the pipe diameter variance to heat transfer of helical coil heat exchanger, applied to solar water heating systems, performed by using three helical coils with pipe diameters variation, with an outer diameter of 6.4; 4.9; 2.95 mm. The heat transfer performance was analyzed by dimensionless number relationship with Wilson Plot technique. The experiment showed that, the performance of helical coil heat exchanger is better at bigger diameter. Forced convection inside the pipe obeyed Nui=ci.Re^0.7 with various  ci  number. The values of  ci  are bigger at bigger pipe diameter and higher hot water temperature.
THE COMPARISON OF BLOCK LEARNING WITH TRADITIONAL LEARNING IN DEVELOPING THREE COMPETENCY ASPECTS OF MECHANICAL ENGINEERING STUDENTS Widarto, Widarto; Jarwopuspito, Jarwopuspito; Rahdiyanta, Dwi; Wibowo, Aris Eko; Djati, Unaga Indera
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.73616

Abstract

Three aspects of student competency consisting of knowledge (cognitive), skills (psychomotor), and attitude (affective). This study aims to compare the achievement of basic machining competencies in block system learning and traditional learning. This study used a quantitative descriptive approach. The method was a quasi-experimental method with posttest only control group design, with the block system treatment in the experimental group and the traditional or regular learning in the control group. The experimental group consisted of 75 students from the Applied Bachelor Degree of Mechanical Engineering Study Program (Diploma 4), and the control group consisted of 66 students from the Bachelor Degree of Mechanical Engineering Education Study Program as the control group. Research data was obtained from the post-test scores for the Machining Theory course and the final scores for Basic Machining Practices. Descriptive statistics show that students' competency achievements in the knowledge aspect in block learning are less good than in traditional learning. However, student competency achievements in the skills and attitude aspects in the block learning system are better than in traditional learning. Although further statistical tests are needed to measure the differences and significance between the two learning modes, these results have provided an illustration of the weaknesses of block learning in theoretical and conceptual learning. Therefore, educators need to apply innovative learning strategies to overcome these weaknesses.
TRAIN WHEEL OUT-OF-ROUNDNESS (OOR) AND MACHINE LEARNING-VIBRATION BASED FAULT DIAGNOSIS: A REVIEW Yusran, Yasser; Suweca, I Wayan; Handoko, Yunendar Aryo
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72682

Abstract

This article aims to give a complete review of previous and current research on numerous types of out-of-roundness (OOR) failures in train wheels, as well as diagnostic approaches based on machine learning and vibration data. The study provides a comprehensive overview of the current state of research by categorizing reviews into three primary domains: (1) types of OOR failures in train wheels, (2) fault diagnosis methodologies, and (3) the use of machine learning and vibration data to diagnose train wheel OOR failures. Initially, the study investigates the characteristics, causes, and consequences of railway wheel OOR failures, including their impact on vibrations. It then dives further into diagnostic methods, comparing the effectiveness of statistical methods to machine learning-based methods for diagnosing failures. Furthermore, the study addresses current advances in machine learning and vibration-based diagnostic methods to diagnose train wheel OOR failures, providing information on their applications and results. This article highlights that by utilizing machine learning methods with vibration data offers a promising way for accurately diagnosing OOR faults in train wheels and predicting their potential failure and remaining useful life, resulting to enhanced maintenance efficiency and less downtime.
GOOGLE SITES: DEVELOPMENT OF 3D CAD TUTORIAL VIDEO FOR CLASS XI AT SMKN 1 BLITAR Azizah, Ambar Isna; Herwanto, Heru Wahyu
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.73640

Abstract

This development research is using the ADDIE model (analysis, design, development, implementation, evaluation) with a quantitative approach. The discussion of the research results is limited to the development stage until the product feasibility validation test. The data collection instrument of this research is a questionnaire with a Likert scale (1-4). The development of 3D drawing video tutorial media using the ADDIE model provides good feasibility test results. This can be proven through the results of product validity tests on media experts with a percentage of 94.44% which means very feasible, on material experts with a percentage of 88.75% which means very feasible, and validity tests based on small-scale student responses with a percentage of 85% which means very feasible. These results indicate that the development of this 3D drawing video tutorial can be used in learning. Based on the overall percentage gain from the results of the product feasibility validity test, it can be said that the 3D drawing video tutorial media displayed through the utilization of the google sites platform is considered feasible to use in learning.
ANALYSIS OF THE EFFECT OF CUTTING SPEED AND CURRENT ON SURFACE ROUGHNESS WITH CNC PLASMA CUTTING ON STEEL PLATES SS400 Susilo, Gunawan Budi; Sasongko, Beni Tri; Wardhana, Prabuditya Bhisma Wisnu
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72268

Abstract

Surface roughness characteristics are very important data in the machining process. This study aims to determine how much influence the cutting speed and current variation with air pressure of 1 MPa on surface roughness of SS 400 steel plate cutting using CNC plasma cutting on roughness. The independent variables of the research are variations in cutting speed and current. Testing the cutting speed of the material removal rate (MMR) using the method of reducing the mass of the workpiece and calculating the empirical formula, testing the surface roughness using the surface roughness tester TR 1200. The data are presented in the form of tables and graphs. The results of the material removal rate test for reducing the mass of the workpiece, the lowest value obtained in this study was 378 mm/min3 with a cutting current of 110 A and the highest was 1890 mm/min3 with a cutting current of 100 A, while at the melting point at a current of 90, 100, 110 Ampere get a value of 0.444, 0.494, 0.543 cm/min3.baSe The results of the roughness test, which should be that the higher the melting point value, the higher the roughness level, at 90 Ampere cutting currents get an average value of 12,502 μm, 100 Ampere currents have an average value of 8.653 μm and, 110 Ampere currents have an average value of 7.56 μm . Cutting speed affects the cutting current, the results of calculations using the mass weighing method and using calculations, the results of testing the measurement of the roughness value are getting smaller. 
A COMPARISON OF CNC LATHE MACHINE PROGRAMMING SIMULATION AND CNC LATHE MACHINE PRODUCTION RESULTS Nugroho, Satrio Adi; Sena, Boni; Ujiburrahman, Ujiburrahman
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.73127

Abstract

This study compares the simulation results of a CNC lathe program with the actual production results of a CNC lathe. CNC lathes are used in the manufacturing of precision components for various industrial applications. Simulation of CNC lathe programs can provide an accurate estimate of the production output before the actual production process begins. In this study, we compared dimensional tolerance, geometric accuracy, and surface quality between simulated and actual results. The simulation method used is 2D modeling which involves the calculation of tool trajectories and cutting parameters inputted into the simulation panel. Actual production data was obtained from the measurement of components produced from the CNC lathe. A comparative analysis was conducted to evaluate the extent to which the simulation can predict the actual production results. The results show that, although the simulation can give a good picture, there is still a significant difference between the simulation results and actual production. The findings have practical implications in improving efficiency and accuracy in the planning and production process using CNC lathes.
THE INFLUENCE OF COLD ROLLING TREATMENT ON THE SS 316L SURFACE PROPERTIES Majid, Aulia; Palmiyanto, Martinus Heru
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72757

Abstract

The biomedical field is increasingly developing with the creation of biomaterial dental crown products that can be used if teeth are damaged from an aesthetic perspective. 316L stainless steel is a biomaterial because it has good corrosion resistance and high mechanical characteristics. However, the corrosion resistance and mechanical strength of 316L stainless steel still need to be improved so that it can be a better dental crown material. This research objective is to increase the mechanical value of 316L stainless steel by cold rolling treatment. Variations in reducing thickness by cold rolling consist of 0%, 5%, and 12%. After that, the specimen will be tested for Vickers hardness on the specimen surface and wettability. The results obtained after the treatment were carried out that the greater the variation in reducing the thickness of the specimen, the greater the Vickers hardness value. However, in the wettability test, the contact angle value decreased along with increasing variations in thickness reduction. The increase in surface hardness value is due to the granules becoming denser due to the influence of cold rolling. This reduces the contact angle value so that the value of all variations becomes less than 90Ëš.
A COMPARISON OF HYDROGEN PRODUCTION BY ELECTROLYSIS METHOD USING WATER ELECTROLYTE WITH STAINLESS STEEL AND COPPER ELECTRODES Afisna, Lathifa Putri; Kolala, Putra Andi; Meha, Gabriel; Pasaribu, Frans Winner; Sindhu, I Gede Pande Naraya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.73126

Abstract

This experiment focuses on the production of hydrogen gas (H2) using the electrolysis method. The electrolysis method converts water (H2O) into the combustible compound H2 and O2, which aids in the combustion process. Hydrogen gas (H2) is an important renewable energy source. Therefore, research is needed to explore and optimize alternative and renewable energy sources, one of which is hydrogen gas. The objective of this experiment was to find the optimal variation between stainless steel and copper in producing the highest hydrogen gas pressure. In this experiment, a power source of 12 V 20 A was used, along with a salt solution of 1500 mL with a concentration of 0.167 gr/mL. Two different types of cathodes were used, stainless steel and copper. The experiment involved variations in the number of plates, namely 3, 5, and 7, and testing durations of 5, 10, and 15 minutes. The test results indicated that the hydrogen gas pressure increased with the increasing number of plates and electrolysis time. The highest pressure was achieved using copper plates with 7 plates and an electrolysis time of 15 minutes. Under these conditions, the hydrogen gas pressure reached 439.677 Pa 
QUANTITATIVE MACRO DEFECT ANALYSIS IN SAND CASTING: 3D SIMULATION AND POROSITY ASSESSMENT IN ASHTRAY PATTERNS Maulana, Jibril; Adjie P.W, Muhammad; M.H, Rachmanda; Aliyudin F, Rifan; Maulana, Yusuf; Lubis, Didin Zakariya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77486

Abstract

Simulation analysis and quantitative approaches have become very important in the foundry industry to improve product quality and minimize defects. This study aims to analyze macro defects, particularly porosity, in ashtray patterns produced through sand casting. A quantitative approach was used to identify and evaluate macro defects in the castings by utilizing 3D simulation techniques. This process involves taking macro images of the molded samples and then processing them to determine the porosity level. The porosity evaluation was carried out by comparing the simulation results with experimental data, thus enabling a more in-depth understanding of the factors affecting casting quality. The results of this study show the porosity formed by 3-dimensional simulation and the porosity percentage derived from statistical interpretation of macro photographs of sand casting materials. The findings are expected to make a meaningful contribution to the foundry industry, particularly in the effort to improve product quality through process optimization. This study also highlights the importance of quantitative and simulation approaches in analyzing and predicting casting defects, which can ultimately reduce production costs and improve product yield.

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