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INDONESIA
Jurnal Teknik Mesin Indonesia
Published by Badan Kerja Sama Teknik Mesin
ISSN : 1907350X     EISSN : 25977563     DOI : -
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Teknik Mesin Indonesia “JTMI” " adalah jurnal ilmiah sains dan teknologi yang diterbitkan oleh Badan Kerjasama Teknik Mesin Indonesia. JTMI meliputi bidang konversi energi, material, desain mekanikal, manufaktur dan otomasi
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 291 Documents
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Studi eksperimental kinerja mesin TV-1 (engine research test) berbahan bakar campuran diesel-biodiesel Musa, Muhammad Iskandar; Paloboran, Marthen; Rahim, Ismail; Mandra, Mohammad Ahsan S; Herman
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.566

Abstract

This research is a laboratory experimental research that uses research testing machines. Using biodiesel fuel, a mixture of oil and diesel fuel. The composition of the biodiesel mixture used in this research was B35, B40, and B50 into diesel fuel in millilitres (ml). Tests were carried out by varying the load and compression ratio (CR), namely loads of 3 kg, 5 kg, 8 kg, and compression ratios of 14, 16, and 18. Data collection used observation techniques using tables to record the study results obtained. By using descriptive analysis techniques in the form of graphs and tables to make it easier to find out the study results. The results of the study from the engine performance research tests obtained were that performance increased with increasing loading at low compression ratios with the addition of biodiesel to diesel fuel, while at high compression ratios, the greatest power was obtained from B35 mixed fuel. However, the lowest fuel consumption in the mixture composition is the B35 mixture. Meanwhile, the lowest emission density opacity obtained was in the mixture of B35 and B40 biodiesel.
Rancang bangun angle pad sebagai alat bantu asah pahat bubut untuk menunjang pembelajaran praktik pemesinan di universitas negeri surabaya Ramadani, Ali Hasbi; Soeryanto; Cholik, Mochamad; Santoso, Dany Iman; Anwar, Saiful; Prayogo, Aji Catur
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.570

Abstract

In the process of working lathe chisels, students still find it difficult to form tool geometry that is in accordance with standards (chips angle, free angle, and incision angle). Therefore, it is necessary to design an angle pad as a tool to sharpen lathe chisels to support practical learning in the Production Laboratory, Mechanical Engineering Department, Universitas Negeri Surabaya, so that students can understand and be competent in sharpening lathe chisels. The research method used is development, the research method carried out is development research focused on the stages of angle pad design starting from design to function tests and assessments from several experts. The results of this study, in the form of an angle pad that has been tested and has been validated by experts, the results of tests carried out to hone single-cut lathe chisels, the most basic tool angles are rake angle, clearance angle, and cutting edge angle, from the trials carried out produce precise angles on the right flat tool and metric thread tool 600. The validation results from experts related to making angle pads have a value of 93.33 (very decent category).
Analisis keseragaman kolektor surya pelat datar glazed dan unglazed Efendi, Rustam; Nelwan, Leopold Oscar; Wulandani, Dyah
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.599

Abstract

Solar collectors, as a means of converting solar energy into thermal energy, are the focus of this study. Two types of solar collectors used, namely glazed flat plates (KSPDG) and unglazed flat plates (KSPDU), are tested to evaluate uniformity of performance. The study was conducted using a testing setup that included a tank, water pump, thermocouple, flowmeter, anemometer, and pyranometer. Uniformity testing is performed by analyzing inlet temperature, outlet temperature, ambient temperature, and solar irradiation during 8 hours of testing. Test results show that both types of solar collectors show similar trends in performance, with increases in water temperature aligned with increased solar irradiation. Statistical analysis shows a similar level of uniformity between KSPDU I and KSPDU II, as well as between KSPDG I, KSPDG II, and KSPDG III.
Metode kerja pengujian bending hasil pengelasan pipa dengan metode SMAW elektroda E7018 standar ASTM D790 Khristyson, Samuel Febriary; Cahyo, Indro Dwi
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.605

Abstract

Bending testing is one way of testing welding results or materials which are included in destructive testing. Selection of decisions in determining the choice of the sequence of process methods can indicate the level of accuracy and effectiveness of an activity. The purpose of this study was to find out the criteria for work methods for testing the results of welding on pipes with a hydraulic press in the Welding and Ship Construction Education and Research Laboratory, Industrial Technology Department, Vocational School, Diponegoro University, Semarang. An alternative method with a rational approach to find out the criteria for each function of the testing process is presented in this study. The highest alternative value, 80%, is in the first preference where the second alternative method is used as a reference with 2 practitioners and an average usage time of 75 minutes. So that the selection of function parameters as seen from the aspects of function, economy, and time used can be adjusted to the usefulness of the work equipment in the laboratory.
Pengendalian cacat tuang produk cor aluminium ADC 12 gravity-die-casting: Studi kasus di PT Sinar Mulia Teknalum Setyo, Noor; Hayati, Nur
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.607

Abstract

Casting defects in cast products will always appear due to the unexpected presence of the X Factor in every casting process. Casting experts can only minimize the appearance of casting defects by carrying out controls starting from the product design process, process design, pattern, mold, melting, and casting to obtain cast products that have quality standards that are free from casting defects. This case study aims to determine the quality control methods carried out by the metal casting industry PT Sinar Mulia Teknalum in overcoming casting defects in ADC 12 Gravity-Die-Casting aluminium alloy cast products, namely adapters, knobs, break drums, and cigarette rolling bases which have shrinkage defects, porosity, mis-run, porous and other types of defects. Quality control for casting defects is carried out in four stages continuously using a solution method that is also a problem solver to Plan, Do, Check, and Action (PDCA) quality control and supporting Seven Tools as a quality control tool. The process of observing casting defects is carried out visually (sight), based on initial data before control is carried out, the product has casting defects of 51.16% shrinkage, 27.91% porosity, 11.63% mis-run, 6.98% porousness, and other defects below 2.33%. Casting defects occur due to the influence of human factors, tools, materials, methods, and environment. After recommendations from the quality control team, corrective steps are taken for each cause of casting defects. Overall casting defects experienced a total interconnected decrease of 29.07%, which included 9.30% shrinkage, 6.98% porosity, 6.98% mis-run, 4.65% porousness, and other defects as much as 1.16%. This reduction in casting defects can be seen as a guide or reference for the work of the PDCA cycle in overcoming casting defects on an ongoing basis in the future.
Pengaruh Penambahan Ball Mouth Pada Pompa Aliran Aksial Pvc 6 Inci Bertenaga Motor Listrik 1.5 Kw rendi; Arifin, Jainal; Maulana, Ahmad
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.612

Abstract

Axial pumps are a type of centrifugal type water pump that is widely used by the agricultural and fishing industries to move water in large capacities. This research aims to study the effect of adding Ball Mouth to an axial flow pump designed and made from 6 inch PVC pipe powered by a 1.5 kW electric motor. This research uses an experimental method, namely by testing 3 prototype axial pumps using Ball Mouth model A, model B and without using a ball mouth. The test was carried out by varying the number of propeller blades, namely blade 2, blade 3 and blade 4. Data was taken by measuring volume flow rate via U-Notch and electrical power consumption via an Ampermeter measuring instrument. The results show that the addition of the Ball Mouth, especially model B, increases the volume flow rate and pump efficiency significantly. However, the differences between models A and B are not consistent across blades, indicating the importance of design adjustments for optimal results.
Analisis Potensi Pemanfaatan Kotoran Ternak Ruminansia Sebagai Sumber Energi Biogas di Provinsi Lampung Harmiansyah, Harmiansyah; Oviana, Ella; Bilhaq, Ikrar; Fadhilah, Rafi; Akbar, M; Meidaliyantisyah, Meidaliyantisyah; Suretno, Nandari; Efendi, Rustam
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.614

Abstract

Energy, as the foundation of human needs, has benefits that can be utilized in various aspects such as industry, transportation, and household life. The study on biogas energy derived from the excrement of ruminant animals can be analyzed to meet the energy needs in the Lampung province. The data used is sourced from secondary data from the Lampung provincial BPS (Central Statistics Agency) in the year 2021. The variables in this research include the population of ruminant animals, potential waste production, potential biogas production, the potential energy capacity of biogas from ruminant animal waste, and the potential energy equivalence of biogas to LPG gas. Data analysis based on the accumulation of biogas produced from animal waste is influenced by various factors such as feeding, animal type, weight, total solid proportion, and waste availability. The study results indicate that the potential production of ruminant animal waste biogas in 2021 is 262.402.501,1 m³/year. The potential production of biogas from cattle waste is 235.969.215 m³/year, from buffalo waste is 11.498.047,5 m³/year, and from goat waste is 14.935.238,63 m³/year. The recommended types of biogas digesters that can be implemented are the floating tank type, plastic tubular type, and fixed dome type. Based on the study results, it can be concluded that the potential of ruminant animal waste for biogas energy in the Lampung province is very significant.
Rancang Bangun Mesin Penyangrai Biji Kopi Dengan Sistem Kontrol Suhu Otomatis Muhammad irwan; Panggabean, Hasbullah
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.615

Abstract

This research aims to enhance the quality of coffee bean roasting in Indonesia by designing an automated control-based roasting machine. The machine serves as a solution to the constraints of traditional roasting processes, particularly prevalent in rural areas. In the context of Indonesia's substantial coffee production, being one of the world's largest producers, the coffee bean roasting machine is anticipated to improve efficiency and consistency in the final product. The research methodology employs a design approach, utilizing tools such as lathes, grinders, and welding machines. Materials include a power window motor, hollow iron, angle iron, and other components. The design process comprises several stages, including the construction of the machine frame, agitator design, and the implementation of an automatic control system. Machine testing results indicate roasting levels within standard parameters for light, medium, and dark roasts. The temperature-time comparison graph illustrates consistent temperature changes throughout the roasting process. In conclusion, the coffee bean roasting machine exhibits significant potential to enhance the quality and efficiency of coffee roasting in Indonesia. By incorporating post-harvest technology, it is expected to contribute significantly to increasing the value of agricultural commodities and the overall economic well-being of communities
Perhitungan efektivitas kondensor unit 2 di PLTU pelabuhan tarahan 2x8 MW Sulistiyo, Eko; Ahnaf, Nadhif Zhaher; Ridwan, Muhammad
Jurnal Teknik Mesin Indonesia Vol. 19 No. 1 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i1.620

Abstract

The condenser plays an important role in cooling the steam coming out of the turbine and turning it into condensate water again. However, there are several factors that can influence the effectiveness of the condenser, such as the NTU (Number of Transfer Unit) value, vacuum pressure and cooling water temperature, so they can have a significant impact on condenser performance and the overall working efficiency of the PLTU. This research was carried out at the Tarahan Harbor 2x8 MW PLTU. The aim of this research was to determine the influence and correlation of the NTU (Number of Transfer Units), vacuum pressure, and inlet cooling water temperature on the effectiveness of the condenser at the PLTU. This research method is quantitative, the research technique uses interviews, observation and documentation. The analysis used in this research uses multiple linear analysis. The research results show that the NTU (Number of Transfer Units) value has little influence on condenser effectiveness with an R-squared value of 0.24. Where the higher the NTU (Number of Transfer Units) value, the lower the condenser's effectiveness. Apart from that, vacuum pressure affects the effectiveness of the condenser with an R-squared value of 0.74. The higher the vacuum pressure (the more negative it is), the effectiveness of the condenser will increase. Meanwhile, the cooling water inlet temperature has no effect on the effectiveness of the condenser with an R-squared value of 0.09 because there are several parameters or other factors that influence the effectiveness of the condenser, such as cooling water circulation, pipe cleanliness, and the cleanliness of the condenser itself.
Pengaruh Variasi Kecepatan Udara Pada Airfoil NACA 2412 Terhadap Distribusi Tekanan Pada Open Circuit Low Subsonic Wind Tunnel Kharisma, Aji Abdillah; Agung Ramadhan, Abdul Rahman; Amanda, Bayu
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v19i02.627

Abstract

An airfoil is a geometric shape that can provide a big lift force and a small resistance force when going through a fluid flow. Airfoil analysis is particularly significant for determining the lift force, drag force, temperature changes, and air pressure distribution that occurs especially in an airplane. In this research, a NACA 2412 series airfoil model was examined using two methods. The initial experiment involved direct study using 3D printing modeling findings, which were evaluated in a wind tunnel. The second test was computerized using Solidworks software. The objective of this study is to compare the results of experiments (experimental) with models of the influence of variations in air speed on the pressure distribution that occurs on the NACA 2412 airfoil. The results of the analysis of wind tunnel tests are changes in the maximum air pressure distribution that occurs, specifically at a speed variation of 5 m /s = 101344.62 Pa, 10 m/s = 101418.195 Pa, 15 m/s = 101560.44 Pa, and 20 m/s = 101737.02 Pa. According to the findings of this study, the higher the wind or air speed, the greater the pressure distribution.

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