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Published by Universitas Merdeka Malang
ISSN : 02163233     EISSN : 25802283     DOI : -
Core Subject : Engineering,
Automotive Engineering Control & Systems Engineering
Jurnal TRANSMISI dipublikasikan oleh Jurusan Teknik Mesin Universitas Merdeka Malang sebagai media diseminasi hasil penelitian dan karya ilmiah baik penelitian dasar maupun terapan di bidang teknik mesin. Berkala ilmiah ini memuat naskah dengan bidang kompetensi konversi energi, material (metalurgi), produksi dan manufaktur baik merupakan penelitian dasar ataupun rekayasa alat terapan.
Arjuna Subject : -
Articles 266 Documents
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Analisis Proses Vacuum Pump Impeller Repair Sebagai Upaya Meningkatkan Kinerja Komponen Xaferius Boli; Sufiyanto Sufiyanto; Djoko Andrijono; Agus Iswantoko; Lois Delvencio Djoke Besu; Michael Silvester
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17315

Abstract

The repair process for a vacuum pump impeller is necessary to address damage caused by wear, erosion, and geometric distortion that can reduce the pump's efficiency. This study aims to analyze the repair process of a vacuum pump impeller to restore the impeller's performance. The methods used include visual inspection, dimensional measurement, process planning, and implementation of the repair process. The repair stages include initial cleaning, welding build-up on the vanes, reshaping using a lathe machine, pressing the bushing onto the shaft, and finishing with grinding. The repair focuses on the vanes and the shaft, as these two parts experience the highest level of wear. The study results indicate that the implemented repair process stages were able to restore dimensions, improve surface quality, and enhance the performance of the vacuum pump impeller.
Analysis of the Effect of Electrode Material and NaCl Solution Concentration on Hydrogen Gas Production in a WET Cell Generator Dian Ayuna Atanti; Dadang Hermawan; Akhmad Farid; Purbo Suwandono
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17548

Abstract

Rising energy demands and dwindling fossil fuel reserves are driving the development of more environmentally friendly alternative energy sources. Hydrogen is a promising alternative energy source, characterized by high calorific value and water vapor as its sole byproduct. Water electrolysis using a WET Cell generator is a widely used method for hydrogen production. Hydrogen gas yield during electrolysis is influenced by several factors, including electrode material and electrolyte solution concentration. This study aims to analyze the effects of electrode materials, aluminum (Al), copper (Cu), and stainless steel (SS), and NaCl solution concentrations on hydrogen gas yield in a WET Cell generator. An experimental laboratory approach was employed using a 3x3 factorial design, incorporating three electrode materials and three NaCl solution concentrations (0%, 5%, 10%). Hydrogen gas concentration was measured in ppm using an Arduino Uno based MQ-8 sensor and subsequently analyzed with IBM SPSS Statistics 27 software using descriptive statistics, normality tests, homogeneity tests, and two-way ANOVA. The results indicate that average hydrogen yields for the respective electrodes were 46.05 ppm, 51.32 ppm, and 49.81 ppm at 0% NaCl; 124.05 ppm, 252.50 ppm, and 60.38 ppm at 5% NaCl; and 238.80 ppm, 94.89 ppm, and 131.61 ppm at 10% NaCl. The combination of stainless steel electrodes and 10% NaCl solution yielded the highest hydrogen output (238.80 ppm), while the combination of stainless steel electrodes and 0% NaCl solution yielded the lowest (46.05 ppm). The two-way ANOVA results indicate that the electrode type, NaCl solution concentration, and the interaction between the two have a significant effect on hydrogen gas productivity (Sig. < 0.05).  
Analysis of the Effects of Wet-Cell Electrolysis Variations Using Aluminum and Iron Electrodes on Hydrogen and Oxygen Gas Concentrations Hanif Dwi Saputra; Dadang Hermawan; Nova Risdiyanto Ismail; Gatot Soebiyakto
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17550

Abstract

This research is motivated by the global energy crisis due to declining fossil fuel reserves, necessitating the development of renewable energy sources (EBT) such as hydrogen gas through water electrolysis. This study aims to analyze the effect of KOH solution concentration variations (1%–5%) combined with natural coconut water electrolyte, and to compare the use of aluminum (Al) and iron (Fe) electrode materials on hydrogen gas production rate in a wet cell system. The method used is quantitative laboratory experimentation with a 15 V DC power supply, 500 mL electrolyte volume, and 60-minute testing duration. Hydrogen and oxygen gas measurement used MQ-8 and MQ-135 sensors based on Arduino Uno in PPM units. Results show that 5% KOH concentration provides the highest gas production rate for both electrode types. The combination of aluminum electrodes with coconut water and 5% KOH achieves a maximum hydrogen gas production of 787.48 ppm, while 1% concentration yields minimum values. Iron electrodes outperform in pure water media (hydrogen 730.82 ppm at 5% KOH), while aluminum electrodes dominate in coconut water media.
Mechanical Property Characterization Of Carbon Steel Material Based On Rockwell Hardness Testing Mas’ud; Wisma Soedarmadji
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17638

Abstract

Carbon steel is one of the most widely used engineering materials in the manufacturing and construction industries due to its favorable mechanical properties, ease of fabrication, and relatively low production cost. One of the most important parameters in evaluating carbon steel quality is hardness, which reflects the material's resistance to plastic deformation. This study aims to characterize the mechanical properties of carbon steel through Rockwell hardness testing using the Jominy End Quench method, determine the hardness distribution along the specimen, and analyze the relationship between the testing position and hardness value. The research employed ST 37 carbon steel specimens with a diameter of 25 mm and a length of 100 mm. The specimens were heated to 763°C, held for 5 minutes, cooled using the Jominy End Quench method, and subsequently tested using the Rockwell hardness method at ten measurement points. The results indicate that the hardness decreased from 78.6 HRB at a distance of 4 mm to 72.1 HRB at 40 mm, reflecting the reduction in cooling rate along the specimen. The average hardness value obtained was 67.205 HRB, with a measurement accuracy of 99.91%. Regression analysis produced the equation Y = 73.255 − 0.3025X, indicating that every 1 mm increase in testing distance resulted in a hardness reduction of approximately 0.3025 HRB. The correlation coefficient of −0.886 demonstrates a very strong negative relationship between testing position and hardness, while the coefficient of determination of 78.53% indicates that most of the hardness variation is influenced by the testing position or cooling rate. The findings confirm that the combination of the Jominy End Quench method and Rockwell hardness testing is effective for evaluating the hardenability and hardness distribution of carbon steel.
A Study Of The Optimal Performance Of A Mini Hydro Turbine Generator Based On Flow Rate Variations Dodik Fitransyah; F.A. Widiharsaa; Rudi Hariyanto
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17827

Abstract

Efforts to generate electrical energy are by utilizing water turbines as generator drivers. Mini water turbine generators are one alternative solution. The performance testing of this mini water turbine prototype uses water flow from a reservoir which is forwarded through a pump based on variations in discharge using a 220 Volt AC dimmer. The mini water turbine prototype is a crossflow turbine (Banki) type water turbine, has 21 blades, an inlet (nozzle) diameter of 2.5 mm, an outlet diameter of 15 mm and an axial gap of 0.2 - 1.0 mm. In this test, a 12 Volt DC LED lamp load was used. The results of this water turbine prototype test produced the highest efficiency of 54.6% at a water flow rate of 5.7 (liters/minute), a DC electric current of up to 423 (Ma) with a power of 4.03 Watts and a voltage of 9.53 Volts.
Tensile Strength Analysis of Wire after Annealing and Hardening Using a Hydraulic Tensile Testing Machine Marselinus Embu; Ir. Jumiadi, MT; DR. Ir. R. Djoko Andrijono, MT
TRANSMISI Vol. 22 No. 1 (2026): March 2026
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v22i1.17828

Abstract

Annealing is a heat treatment of metal with slow cooling to remove internal stresses or to reduce the crystal structure (involves heating above a critical temperature. Hardening is a heat treatment process carried out to produce a hard workpiece. Tensile testing is one of the mechanical tests that most widely used in industry and in education because of the ease of analyzing the data obtained and obtaining information about the mechanical properties of a material.In this study using 304 stainless steel wire with a diameter of 1 mm, aims to determine the maximum load limit, maximum stress and strain From the annealing and hardening processes, the results obtained after the annealing process 1 obtained a maximum load of 72.7 kg, tension 92.611 kg/mm2, strain 0.184, anneling 2 maximum load 75.7 kg, stress 96,433 kg/mm2, strain 0.267, annleng 3 maximum load 70.6 kg, tension 8 9.936 kg/mm2, strain 0.326.Hardening 1 maximum load obtained 72.5 kg, stress 92.356 kg/mm2, strain 0.176, hardenig 2 maximum load 73.5 kg, stress 93,630 kg/mm2, strain 0.252, hardening 3 maximum load, 73.3 kg, strain 93,376 kg/mm2, strain 0.213. And raw material 1 obtained a maximum load of 134.1 kg, stress 170.828 kg/mm2, strain 0.022, raw material 2 maximum load 129.4 stress 164.841 kg/mm2, strain 0.013, raw material 3maximum load 128.8 kg, stress 164.076 kg/mm2, strain 0.01

Page 27 of 27 | Total Record : 266

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