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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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ANALYSIS EFFECT OF WALL DIMENSIONS ON THERMAL RESISTANCE IN FURNACE INDUCTION 1200 ⁰C Ahmad Zohari; Eka Bima Saputra; Rivaldo Rivaldo; Sigit Ariyanto; Andriansyah Andriansyah
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.53747

Abstract

The development of metal hardening industry using electrical induction to increase the hardening temperature chamber is very quick. The temperature can reach 1200 °C in short time by adjusting the electricity input to heater. However, the temperature can also decrease significantly, if the thermal resistance of room cannot prevent heat transfer to outside. The research method uses analysis of other research and direct measurements on induction furnace machine. The machine specifications have maximum room temperature (T1= 1200 ℃), surrounding temperature (T2= 25.8 °C), and the firebrick thermal conductivity (k= 4.78 J/s m°C). Researchers focused on testing variations dimensions (breadth and thickness) of walls. Based on calculation results, the best thermal resistance is 1.1308 in dimension 2 with breadth of 259 cm2 and thickness of 14 cm. This is in accordance with theory of thermal resistance that the higher thermal resistance produced, the higher ability of material to inhibit rate of heat flow.
PROTOTYPE OF TRADITIONAL MINED CRUDE OIL DISTILLATION TECHNOLOGY Islakhul Umah Arif; Basyirun Basyirun
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.53611

Abstract

Crude oil or petroleum is a complex hydrocarbon compound consisting of carbon, hydrogen, and a small number of other elements such as oxygen, nitrogen, sulfur, and several metals including Fe, Na, Va, all of which are impurities. In Wonocolo there is a traditional oil mining relic from the Dutch era carried out by local residents. Oil from traditional mining is processed by residents into diesel fuel by simple distillation. Petroleum distillery equipment which is still simple has several drawbacks, namely the process is carried out openly, condenser heat transfer is not optimal along with the distillation process, and causes air pollution in the surrounding environment. This study aims to design a laboratory-scale distillation prototype that has the characteristics of setting the cooling water discharge in the condenser, the effect of time on the distillation capacity, and setting the boiler temperature on the prototype. The results of the prototype design for crude oil distillery have the following specifications; the capacity of the petroleum distillery process is 5000 ml in the boiler, the boiler material uses stainless steel 201. The condenser uses a shell and tube type with counter flow flow direction, with a number of tubes 12 with a diameter of 19 mm and a length of 500 mm.The prototype characteristics in the 3-7 discharge test have the highest heat transfer value at 7 liters/minute discharge, which is 210.8 W and the lowest is 50.19 W at 3 liters/minute discharge. Characteristics of distillation time at 174.48 minutes can produce 3486.67 ml of diesel oil with a kitchen temperature of 350 oC. The characteristics of the kitchen temperature control from 310 oC, 330 oC, 350 oC, 370 oC, and 390 oC, the highest diesel oil was 4350 ml at 390 oC and the lowest was 1670 ml at 310 oC.
THE DESIGN OF PULPER MACHINE TO INCREASE COFFEE PRODUCTION CAPACITY IN REALIZING PEOPLE'S ECONOMY Kiromim Baroroh; Sutopo Sutopo; Aprilia Tina Lidyasari; Eva Imania Eliasa; Khairul Irsad; Nugroho Suryo Pambudi; Devi Kusumawati; Richa Lailil Ulya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.54508

Abstract

The planning and making of the peeler machine for coffee skin are aimed at completing the needs of SMEs at Pagerharjo, Samigaluh, Kulonprogo. The manual process is the main obstacle in peeling coffee sheets in SMEs. The main objective of creating technological innovation is to assist workers in the production process using appropriate technology to make their work more qualified, effective, and efficient. In planning and making coffee pulper, we must study some literature, make plans, calculate the process of creating tools, and evaluate the tools' trial and error. The picture design use application, namely Autodesk Inventor. The size of the machine is 110 cm x 127 cm x 130 cm; using a motor with gas oil, and the first circle is 3600 rpm, used to pull components with the ratio 1:6, v-belt the type A 75, one solid ship with the diameter of 20 mm. the final result is that the capacity of the pulper machine for coffee is 610 kg/hour.
IMPLEMENTATION OF PROJECT-BASED LEARNING TO EXPLORE STUDENTS' CREATIVITY, INNOVATION, AND CREATIVE THINKING ABILITY Virda Hersy Lutviana Saputri; Khusni Syauqi
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.60351

Abstract

Project-based learning is a learning model involving the participants' active role, who use the project as a learning tool to achieve student attitudes, knowledge, and skill competencies. Therefore, this study aims to examine the implementation of the Project-based Learning (PjBL) model in implementing entrepreneurship lectures. This learning model is carried out to help, encourage and guide students to focus on collaboration by involving group work and helping students to focus on their development. This research uses qualitative methods. The research was conducted at a state university in Yogyakarta with 51 students taking creativity, innovation, and entrepreneurship courses, working in groups to get projects on making business proposals and prototypes of technology-based product innovations. The stages of learning include essential questions, planning, scheduling, monitoring, assessing, and evaluation. The study results show that implementing project-based learning in lectures can explore students' creativity, innovation, and creative thinking skills. Creativity, innovation, and creative thinking skills are shown by students in preparing business proposals and prototypes of technology-based product innovations. By doing these works, students can find out their level of understanding of learning. Group project assignments can generate creative ideas to assist students in exploring creativity, innovation, and creative thinking.
EXPERIMENTAL STUDY OF THE EFFECT OF PLATE CURVES ON SOLAR STOVE Lohdy Diana; Arrad Ghani Safitra; Agung Dwi Cahyo
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.53487

Abstract

In the midst of various other energy needs, cooking has received special attention in energy consumption due to the scarcity of fuel for cooking which is currently commonly used by the community. The scarcity is directly proportional to the increase in fuel prices. Currently, many alternative energies are being developed, one of which is cooking using solar power. In this study, an experimental study of the effect of the number of plate bends on the solar cooker carried out. This study aims to determine the effect of the number of curvatures of the plate on the performance of a solar cooker. The number of curved aluminum plates in the solar cooker was expected to be able to expand the area of absorption of solar heat, thereby increasing the temperature of the air inside the solar cooker. The solar cooker also adds an absorbent plate in the shape of a flower-like arc. Variations in the number of arches to be studied are 6, 8, and 12 arches. The method used in this study is an experiment in actual conditions. Research result show solar stoves with 12 curved walls have a higher temperature increase and heat absorption compared to 6 and 8 arches. This is because 12 arches have a wider solar heat absorption area.
SYNCHRONOUS AND ASYNCHRONOUS LEARNING ACTIVITIES AS ALTERNATIVE DISTANCE LEARNING MODELS THAT ARE ORIENTED TO OUTCOME-BASED EDUCATION Dianna Ratnawati; Hasnul Azwan Bin Azizan; Mohammad Omar AL-Momani
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.60742

Abstract

The learning model for teacher professional education program is carried out online by utilizing a learning management system which is divided into synchronous and asynchronous learning activities. The combination of these two activities is expected to optimize the quality of online learning, but in practice the success of this distance learning model often encounters obstacles both internal and external factors including network constraints, devices used, time management due to busy activities, differences in competence in digital literacy and student data literacy. , as well as constraints on achieving timespend in synchronous and asynchronous activities. Obstacles that arise as obstacles in learning activities need to be evaluated and solutions sought. This study aims to analyze the learning constraints in synchronous and asynchronous activities and find alternative solutions to support the achievement of outcomes based education. The method used is a case study through qualitative analysis. The research subjects were students of the teaching profession program in mechanical engineering concentration positions. The results of the study show that synchronous activities support students learning quickly but need to be supported by a stable network, quality devices, time management and human resources with good technological literacy and digital literacy. Whereas asynchronous provides breadth in the flexibility of learning activities but requires precision and consistency so that you don't get bored easily and require activeness in learning activities. It can be concluded that the effectiveness of distance learning is by collaborating synchronous and asynchronous learning proportionally and mutually reinforcing so that the quality of online learning can be guaranteed and the goals of the teaching profession program can be achieved
ANALYSIS OF THE APPLICATION OF PERSONAL PROTECTIVE EQUIPMENT IN THE WELDING INDUSTRY Egi Suryana; Sulaeman Deni Ramdani
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.60583

Abstract

The welding industry is one of the informal workplaces at risk of accidents and occupational diseases. Workers can be directly exposed to foreign matter or radiation from visible rays and sparks from the welding process during the welding process. This is a problem for people who are engaged in the profession of welding workers. This study aimed to analyze the application of personal protective equipment used by workers in the welding industry. This research is classified in the type of survey research and data collection techniques by observation, interviews, and questionnaire distribution. The subjects of the study were all workers in the welding workshop of Kec. Bayah welding totaling 30 people using random sampling techniques. The research path consists of 3 stages: preparation, data exploration in the field, and analysis of findings. Data analysis using percentages. Based on the analysis of the use of personal protective equipment in 6 welding workshops, Bayah has 57% in the good category and 33% in the less category. As for the analysis of each indicator, the most significant percentage of use in welding glasses is 76%, and the lowest percentage of skin protection is 56%. This shows that the level of concern of each worker is not balanced towards using all personal protective equipment in the welding process, which can cause very vulnerable work accidents.
PERFORMANCE OF SINGLE CYLINDER COMBUSTION ENGINE WITH VARIATIONS IN FUEL OCTANE NUMBER AND COMPRESSION PRESSURE Bahtiar Rahmat; Mohammad Burhan Rubai Wijaya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.57443

Abstract

Performa dari sebuah mesin pembakaran dalam sangat dipengaruhi oleh beberapa faktor, diantaranya kualitas bahan bakar serta tekanan kompresi dari mesin. Tekanan kompresi yang tinggi dan diikuti pemilihan angka oktan bahan bakar yang sesuai, akan menghasilkan performa yang optimal. Sayangnya, hanya sedikit pengguna yang mengetahui bahwa mesin kompresi tinggi membutuhkan bahan bakar dengan angka oktan tinggi. Tujuan dari penelitian ini adalah untuk mengetahui perbedaan keluaran daya & torsi mesin pembakaran dalam satu silinder yang diberikan variasi tekanan kompresi menggunakan bahan bakar Pertamax & Pertamax Plus. Uji dynamometer dilakukan untuk mengetahui perbedaan performa mesin. Hasil penelitian menunjukkan bahwa mesin dengan tekanan kompresi (11,8 Kg/cm2) dengan bahan bakar Pertamax Plus menghasilkan keluaran daya tertinggi sebesar 7,5 KW dengan keluaran torsi tertinggi sebesar 9,6 Nm. Sedangkan mesin dengan tekanan kompresi (10 Kg/cm2) mengunakan bahan bakar Pertamax menghasilkan keluaran tenaga terendah sebesar 4,2 KW dengan keluaran torsi terendah sebesar 3,8 Nm.
EXPERIMENTAL STUDY OF REFRIGERANT REPLACEMENT FROM R-22 TO R-290 HYDROCARBON IN DOMESTIC AC Arrad Ghani Safitra; Prima Dewi Permatasari; Teguh Hady Ariwibowo; Lohdy Diana; Nabila Haninda Az Zahra; Lovyta Putri Adianti
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.65204

Abstract

Most of the refrigerant used in split-type AC machines is HCFC type R-22, which can potentially damage the ozone layer and global warming. Musicool-22 is a trade name for the hydrocarbon refrigerant R-290, an alternative refrigerant that can replace R-22. Tests were carried out on the test equipment by comparing R-22 and Musicool-22 with the same variation of thermal load. Based on the test, the performance of the two working fluids can be determined by determining the coefficient of performance (COP) and comparing it with various cooling loads. In addition, it is proven that using Musicool-22 can save electrical energy and the power value of the compressor. The data measured are temperature, pressure, voltage, and electric current. Based on the results of calculations carried out by changing R-22 to Musicool-22, it shows that the COP value increases. The highest COP of R-22 is 2.45 at an 80-Watt load, and Musicool-22 is 4.21 at a 320-Watt load. The application of Musicool-22 can save electrical energy by 15.40%. Moreover, it saved electricity usage costs of IDR 44,450.53 per month.
ANALYSIS OF SMAW IN DIFFERENT MATERIALS WITH ELECTRODE VARIATIONS Rajab, Dede Ardi; Artitana, Lapi; Suprayitno, Agus
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 2 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i2.64465

Abstract

Welding is a technique for joining metals by melting part of the parent metal and filler metal with or without additional metal and producing a continuous connection. One type of welding that is often used is SMAW welding (Shield Metal Arc Welding). In SMAW welding, the influence of the electrode strength or amperage used plays an important role in welding, because it influences the results of the joint strength during welding. Therefore, the current setting must be appropriate to the material and choosing the right welding parameters will also improve the quality of the welding results. This research was conducted to determine the mechanical properties of tensile testing and the microstructure of the influence of the different electrodes and amperes that will be used. In this research, current variations of 70 A, 80 A, and 90 A were used and the types of electrodes used were E6013, E309-16 and E7018. The research results obtained from the tensile test had an optimum value for the E7018 electrode, 90 A with a tensile strength of 41 .60 kg/mm. The tensile test results for E7018 obtained an average tensile value of 33.19 kg/mm. The tensile test result value of E6013, 80 ampere has a value of 36.55 kg/mm, after being averaged the tensile strength of E6013 is 35.36 kg/mm, the tensile test result of E309, 80 A has a value of 38.15 kg/mm after being averaged got a tensile test value of 36.20 kg/mm.

Page 14 of 19 | Total Record : 185

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