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All Journal MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Jurnal Teknik Industri Terintegrasi (JUTIN) Jurnal Surya Teknika AEEJ : Journal of Automotive Engineering and Vocational Education Jurnal Vokasi Mekanika Journal of Scientech Research and Development Journal of Community Service Jurnal Teknik, Komputer, Agroteknologi dan Sains Innovative: Journal Of Social Science Research TOFEDU: The Future of Education Journal
Risal Abu
Program Studi Teknik Mesin, Fakultas Teknik Dan Perencanaan, Universitas Ekasakti
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Public Health Social Sciences Transportation Other

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Analisis Perbandingan Sifat Mekanik Sambungan Kampuh V Terhadap Kampuh U Hasil Pengelasan SMAW Menggunakan Posisi 3G pada Baja St 37 Maulana, Rizky; Afdal, Afdal; Abu , Risal; Mukhnizar, Mukhnizar; Selviyanty, Veny
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 1 (2024): January
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i1.25625

Abstract

Selection of the type of support that is appropriate to the load will affect the mechanical and physical properties. Using a good type of support and in accordance with welding procedures can have an influence on the welding results (weldability properties). The comparison of the mechanical properties of V-joints to U-joints is that the maximum tensile stress value between V-joints and U-joints is a maximum of 477.17 N/mm2, while the maximum tensile stress value of V-joints is 453.12 N/mm2. The strain value between the V seam connection and the U seam connection is 20%, while the strain value for the V seam connection is 30%. The yield stress value between the V seam joint and the U seam joint is found in the U seam joint with a yield stress value of 356.05 N/mm2, while the yield stress value for the V seam joint is 337.6 N/mm2. The modulus of elasticity value between the V seam connection and the U seam connection is 2,518.09 N/mm2, while the modulus of elasticity value for the V seam connection is 1,529.43 N/mm2.
Pembuatan Alat Uji Putaran Kritis Poros Jufrizal, Ryan; Mukhnizar, Mukhnizar; Afdal , Afdal; Abu , Risal; Zulkarnain , Zulkarnain
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 6 No. 4 (2023): Oktober
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v6i4.26059

Abstract

This critical shaft rotation test tool is used to calculate the maximum deflection of a steel shaft. Currently, the critical shaft rotation test tool still uses human power to operate it, namely by rotating the handle to read the rotation value. So the test results carried out are not effective and accurate. This tool uses an electric motor with ¼ HP power and 2800 Rpm rotation as the driving force. So that the results are more accurate, this tool is designed to use an electronic system (sensor) equipped with a digital counter. Making this critical rotation test tool for the shaft goes through several processes, namely, making a table or position of the critical rotation test tool for the shaft using a digital counter, selecting the disk (load), selecting the bearing (pillow block), selecting the electric motor, selecting the shaft, and selecting the voltage regulator. . The testing phase has undergone several testing stages and the results are as planned. The tool that has been made can be operated effectively and obtain results as planned, and its operation is very easy.
Analysis of the Effect of the Cooling System Modification on the Engine Performance of the Wuling Confero Khairi, Ullul; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 4 No 8 (2025): #2
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i8.1149

Abstract

This study aims to analyze the effect of cooling system modification on the engine performance of the Wuling Confero vehicle. The main focus of this research is to evaluate the impact of thermostat removal and the use of plain water as a substitute for radiator coolant on engine operating temperature, engine speed (RPM), and fuel consumption. The research method used was a quantitative experimental approach, with direct testing using a Vehicle Diagnostic System (VDS) to obtain real-time data on operating temperature, RPM, and fuel consumption. The tests were conducted under three different conditions: the factory-standard cooling system (using a thermostat and coolant), the system without a thermostat, and the system using plain water. The results show that the factory-standard cooling system produced the most stable engine performance, with an optimal operating temperature of 80–92°C, stable RPM at around 750 ± 5, and the lowest fuel consumption of 3.8 ml/min. In contrast, the removal of the thermostat resulted in high temperature fluctuations (±6–8°C), unstable engine speed reaching up to 825 RPM, and the highest fuel consumption at 5.2 ml/min. Meanwhile, the use of plain water showed no statistically significant difference but caused moderate temperature fluctuations (±4.3°C) and a higher risk of long-term corrosion. The Wilcoxon statistical test indicated significant differences between the standard and thermostat-removed systems (Z = −2.81; p < 0.05), as well as between the thermostat-removed and plain-water systems (Z = −2.14; p < 0.05). Cooling system modification particularly by removing the thermostat has a negative impact on temperature stability and engine thermal efficiency. The factory-standard cooling system remains the most efficient configuration and is strongly recommended to maintain optimal performance, fuel efficiency, and engine durability.
Analysis of the Tempering Process Results with Temperature Variations on the Mechanical Properties of AISI 4340 Material Hardness Giano, Jordy; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 4 No 8 (2025): #2
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i8.1182

Abstract

This study aims to determine the effect of tempering temperature variations on the hardness of AISI 4340 steel after undergoing a quenching process. AISI 4340 is a high-strength low-alloy steel widely used in manufacturing industries, making the control of its mechanical properties through heat treatment crucial. In this study, the steel specimens were initially heated to 800°C and rapidly cooled (quenched) in water. Subsequently, the specimens were subjected to tempering at three different temperatures—200°C, 400°C, and 600°C—with a holding time of 60 minutes. The mechanical properties were evaluated using the Rockwell hardness test (HRC scale) with three measurement points on each specimen. The results indicate that variations in tempering temperature significantly affect the hardness of the steel. Tempering at 200°C produced the highest hardness value of 22.00 HRC due to the presence of tempered martensite with fine carbide precipitation. At 400°C, the hardness decreased to 15.90 HRC, attributed to the transformation of martensite into ferrite and fine cementite (troostite). Meanwhile, tempering at 600°C resulted in a hardness value of 17.80 HRC, characterized by a more stable and ductile sorbite structure. Overall, the findings show that increasing tempering temperature generally decreases hardness while enhancing the ductility of AISI 4340 steel.
Analysis of the Effect of Artificial Aging on the Mechanical Properties of Al 2014 Riski, Riski; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 4 No 9 (2025): #1
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i9.1253

Abstract

Aluminum alloy 2014 (Al 2014) is an Al-Cu–based alloy widely used in the aerospace and automotive industries due to its high mechanical strength. However, the mechanical properties of this alloy are strongly influenced by heat treatment, particularly the artificial aging process. This study aims to analyze the effect of artificial aging on the mechanical properties of Al 2014, especially hardness. The Al 2014 samples underwent solution heat treatment at a specified temperature, followed by rapid cooling (quenching) and subsequent artificial aging at various temperatures and holding times. The mechanical test results show that increasing the aging temperature and duration significantly affects the formation of strengthening precipitates, leading to increased hardness until reaching the optimum condition (peak aging). However, excessive aging results in overaging, which reduces mechanical properties due to coarsening of precipitates. Therefore, a precise artificial aging process is essential to optimize the mechanical performance of Al 2014 for engineering applications.
Analysis of Maintenance System on Escalators to Extend Service Life at Minangkabau International Airport Fitri, Annisa Rahmadani; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 5 No 1 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i1.1501

Abstract

An escalator is a vertical transportation system designed to move people between two or more levels in a building. The purpose of this study is to determine the working principle of an escalator. To determine the maintenance system, especially on the Motor, Gearbox, Roller step in an escalator. To determine the maintenance actions on the Motor, Gearbox, Roller step in escalator maintenance to extend the service life of the escalator. This study was conducted at Minangkabau International Airport (BIM) using qualitative methods. The results of this study are that the maintenance system for escalator components (Motor, Gearbox, Roller Step) is carried out twice a month using preventive maintenance. Maintenance actions include routine cleaning, checking the condition of the lubricant, lubrication, and testing the function of each component. With appropriate actions, such as changing the lubricant and checking for wear on critical parts, the service life of the escalator can be extended and performance remains optimal.
THE EFFECT OF FEEDING AND MAIN CUTTING ANGLE ON THE SURFACE ROUGHNESS OF METAL RESULTING FROM FLAT TURNING ON ST 37 STEEL MATERIAL Mukhnizar , Mukhnizar; Muhammad Akbar Pratama; Risal Abu
Journal of Scientech Research and Development Vol 7 No 2 (2025): JSRD, December 2025
Publisher : Ikatan Dosen Menulis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56670/jsrd.v7i2.1508

Abstract

High-quality turning is achieved through optimal cutting conditions. One of the variables affecting cutting conditions is surface roughness. The aim of this research is to examine the influence of feed rate and main cutting angle on the surface roughness of flat turning results on ST 37 steel material. The turning process was carried out with a cutting depth of 0.5 mm during the finishing process by varying the feed rate and main cutting angle. The feed rates used were 0.070 mm/rev, 0.281 mm/rev, and 0.450 mm/rev on ST 37 workpieces with a diameter of 24 mm and a length of 44 mm, which were turned down to a diameter of 23 mm along the same 44 mm length using a High Speed Steel (HSS) cutting tool. After the turning process, the surface roughness of the workpieces was measured using a Mitutoyo SJ-201P Surface Tester. The results of this study show that at main cutting angles of 80° and 90° and feed rates of 0.070 mm/rev, 0.281 mm/rev, and 0.450 mm/rev, the smallest surface roughness value achieved was Ra = 2.88 µm, corresponding to surface roughness grade N7, which occurred at a main cutting angle of 80° and a feed rate of 0.070 mm/rev. Meanwhile, the highest surface roughness value was Ra = 8.85 µm, corresponding to surface roughness grade N9, which occurred at a main cutting angle of 90° and a feed rate of 0.450 mm/rev.
HEAT TRANSFER ANALYSIS IN THE HIGH PRESSURE HEATER CFB BOILER OF PLTU TELUK SIRIH UNIT 2 Muhammad Anwar; Mukhnizar , Mukhnizar; Risal Abu
Journal of Scientech Research and Development Vol 7 No 2 (2025): JSRD, December 2025
Publisher : Ikatan Dosen Menulis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56670/jsrd.v7i2.1509

Abstract

Teluk Sirih Steam Power Plant (PLTU) is a coal-fired power plant with a capacity of 2 × 112 MW, utilizing a Circulating Fluidized Bed (CFB) boiler. One of the critical components in this system is the High Pressure Heater (HPH), which functions as a feedwater preheater to improve the thermal efficiency of the cycle. This research aims to analyze the heat transfer performance of HPH 1 and HPH 2, and to identify the factors contributing to the efficiency decline. The analysis methods include calculations of Terminal Temperature Difference (TTD), Drain Cooler Approach (DCA), Temperature Rise (TR), Log Mean Temperature Difference (LMTD), Heat Capacity Ratio, and thermal effectiveness (ε). Data were collected from performance tests conducted in 2024 and compared with commissioning data from 2014. The results indicate a performance degradation in the HPH units, as shown by increased TTD and DCA values and decreased effectiveness. This decline is suspected to be caused by fouling or damage to the heat exchange tubes, which adversely affects water heating efficiency. The study recommends regular maintenance and cleaning measures to restore the performance of the HPH units. This research is expected to contribute to improving plant efficiency and reducing fuel consumption.
Analysis of Condition Monitoring for LRVP (Liquid Ring Vacuum Pump) Shaft Alignment Using Laser Alignment for Maintenance Actions at PT SEML Fauzi, Arman; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 5 No 1 (2026): #2 IN PROGRESS
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i1.1683

Abstract

The Liquid Ring Vacuum Pump (LRVP) is an important component in geothermal power plant systems that functions to extract non-condensable gases (NCG) such as H₂S, CO₂, and N₂ in order to maintain optimal condensation processes in the power generation system. One of the common problems occurring in pump systems is shaft misalignment, which can lead to increased vibration, temperature, and accelerated damage to components such as bearings and couplings. This study aims to analyze the alignment condition of the LRVP pump shaft using the laser alignment method as part of condition monitoring activities in the maintenance system at PT Supreme Energy Muara Laboh. The research method was carried out by measuring shaft alignment using a laser alignment device installed on the coupling between the motor, gearbox, and pump. The measurement data were then analyzed by comparing the alignment values with the tolerance limits specified by the equipment manufacturer. The results indicate that shaft misalignment can be caused by several factors such as installation errors, unstable foundations, operational vibrations, and inadequate maintenance of pump components. Misalignment that exceeds the tolerance limits may increase vibration and temperature, which can lead to damage to bearings and other mechanical components. Therefore, periodic monitoring and shaft alignment using the laser alignment method are essential to maintain pump performance and improve the operational reliability of geothermal power plant systems.
Co-Authors Adami, Mukhlis Ade Setia Wati Adi Candra, Adi Afdal Afdal Afdal Afdal , Afdal Afdal Afdal, Afdal Ahmadi, Syukri Algusra, Jeri Amsal, Amsal Antonnius, Antonnius Azmil Azman Danyl Mallisza Dewirman Prima Putra Didik Agung Nugroho Eka Satrya Fadlan, Muhammad Fauzan Rinaldi Fauzan, Idham Fauzi, Arman Fitri, Annisa Rahmadani Giano, Jordy Gowasa, Estomi Hasri Devin Hihamsyah, Diva Puperta Irpandi, Wahyu Jufrizal, Ryan Jusmita Weriza Khairi, Ullul Koto, Rahmat Desman M. Iqbal Maharani Syabila JR Mairizal, Yon Muhammad Abdillah Muhammad Afdil Muhammad Akbar Pratama MUHAMMAD ANWAR Muhammad Rafly Ramadhan Mukhnizar Mukhnizar , Mukhnizar Mukhnizar Mukhnizar Muknizar Muknizar, Muknizar Novis, Iskan Pratama, Bagas Adi Pratama, Hardian Putra, Afrionaldi Rahman, Hidayatur Retno Aprilla Hardi Riski, Riski Rizky Maulana, Rizky Robi Arianto Veny Selviyanti Veny Selviyanty Viola Aysiah Widi, Widi Zega, Toniman Zulkarnain Zulkarnain Zulkarnain , Zulkarnain Zulkarnain Zulkarnain