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Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Published by Universitas Bengkulu
ISSN : 25974254     EISSN : 28292855     DOI : https://doi.org/10.33369/rekayasamekanika
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Rekayasa Mekanika is scientific journal on mechanical sciences and engineering field, either pure or inter disciplinary works. This journal is a continuation of Rekayasa Mekanik which changed its name since April 2022. This journal publishes 6 articles for each issue, April and October. Starting April 2025, this journal publishes 10 articles. Authors are cordially invited to submit his/her research, review or monograph papers in English or Indonesian.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 85 Documents
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PENGARUH VARIASI ARUS LISTRIK TERHADAP NILAI KEKERASAN HASIL LASAN BAJA ASTM A36 M. Harun Humaidi; Ahmad Fauzan Suryono; Hendri Hestiawan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25451

Abstract

Metal inert gas (MIG) welding is widely used whenever high and medium speed melting or joining of metals is required, MIG welding uses a DC current which is ignited between the worked part and the electrode wire, where this electrode functions simultaneously as a power carrier and source. metal filler, for MIG welding the gas is inert argon gas or a mixture of argon helium. In this study, the variables to be compared are the effect of variations in electric current and hardness values ​​on MIG welding using CO2 gas. The purpose of this study was to analyze the effect of variations in electric current on the welding results, and to analyze the mechanical properties of the welding hardness value. The material used in this study as the workpiece is ASTM A36 steel with 6 pieces of length, width, and thickness dimensions of each 147 mm x 50 mm x 5 mm. The welding process is carried out by placing two workpieces parallel to the seam facing each other and a distance of 1 mm, with a current of 60 A, 100 A, and 150 A before full welding is carried out welding at the end of the workpiece so that there is no shift, then welding is carried out. full. The data collection method was carried out using the Hardness Tester hardness tester with the Brinell method at 5 test points in the weld area, the HAZ area, and the base metal area. The results showed that the welding results at a current of 60 A obtained uneven wavy, there were ridges at a current of 100 A the welding results were not too wavy, the ridges produced were slightly at a current of 150 A, the welding results were not neat in the middle of the weld area and there are pores. From the visual results of welding, the best welding results are at 100 A, the electric current used in Metal Inert Gas welding affects the weld results, the use of electric current that is close to the ASTM A36 steel welding standard (110 A – 130 A) will get better results. The best hardness value of this welding is at a current of 100 A, with almost the same average values, namely 96.52 HRB, 95.92 HRB, and 96.44 HRB.
ANALISIS PRODUKSI LISTRIK DI PEMBANGKIT LISTRIK TENAGA MINIHIDRO (PLTM) Arif Rahman Hafiz; Agus Nuramal; Nurul Iman Supardi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25452

Abstract

Mini-hydro Power Plant (PLTM) is one of the hydroelectric power plants of choice where PLTM utilizes water energy which has a flow capacity that is not too large. The Padang Guci PLTM with a capacity of 3x2 MW is located in the Air Padang Guci River, under the auspices of PT. Sahung Brantas Energi in collaboration with the Kaur district government to improve electrical energy services to the community. The electrical energy produced by the Padang Guci PLTM is highly dependent on the flow capacity of the Padang Guci river. The data collection process is carried out to retrieve data about voltage, current, time, and electricity production generated by the generator. The electricity produced by the generator can be seen in kWh in the control room. Data on electricity production, current, and voltage on the kWh meter are then inputted into the computer in the operator's room. Every half hour the data is recorded in the table, the daily data table will be entered into excel and will be inputted into the monthly data. Total electricity production during July 2021 is 1,444,252 kWh and the average daily electricity production is 46,588.77 kWh. With the highest daily electricity production, which is 77,644 kWh, the main cause of the increase in electricity production is due to rain which causes flooding in the river flow so that the turbine operates optimally, because the flow rate required is sufficient to power the three turbines to a maximum of 2 MW. Then for the lowest electricity production, which is 5,124 kWh, due to trips and less flow rate.
ANALISA EFEKTIVITAS HEAT EXCHANGER OIL COOLER SEBELUM DAN SESUDAH MAINTENANCE Aziz Masyhuri; Angky Puspawan; Agus Suandi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25453

Abstract

MUSI PLTA is one of the state-owned companies engaged in Hydroelectric Power Generation, MUSI PLTA is one of the largest power plants in Bengkulu Province, which is also a power plant in several provinces on the island of Sumatra. Air power plants consist of many interrelated components which then convert the potential energy of the air into mechanical energy which is then transformed into electrical energy. One of the most important components of this plant is the oil cooler. The oil cooler is a heat exchanger that functions to cool the oil that will be used as a thrust bearing on the generator. This oil cooler has a shell and tube type where two types of fluids flow separately with a two pass heat exchanger type. The effectiveness of the oil cooler unit 1 UL PLTA MUSI on conditions before and before treatment was obtained from the calculation of the effectiveness value. In the pre-maintenance condition, the effectiveness value was 9.947089947 %, while in the pre-maintenance condition the effectiveness value was 13.03 %.
ANALISA KOEFISIEN UJUK KERJA MESIN PENDINGIN (CHILLER) UNIT 1 PADA POWER HOUSE Julianto Sinaga; Yovan Witanto; Agus Nuramal
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25454

Abstract

Each refrigerant has different characteristic properties which affect the refrigeration effect and the resulting coefficient of performance (COP). A refrigeration machine that works by cooling water is called a refrigeration machine chillers. Chiller is an air conditioner with no cooling system direct. In this indirect cooling system, the refrigeration engine does not instantly cools the air in every room. Refrigeration machine cools water demin first, then this cold demin water is used for cool the air in the room. Cold demin water as cooling medium to reduce the temperature of a wide room at power house (PH) PLTA Musi. The method used in working on this practical work report is:by making observations or observations in the field, conducting interviews (interview) with supervisors and practical work supervisors regarding theoretical data (specification data). In this study, the Cooling Performance Coefficient (COP) was analyzed On Power House (PH) PT PLN (PERSERO) UL PLTA Musi The results of this study get the conclusion, namely: The coefficient of performance (COP) on the machine chiller unit 1 in Power House PLTA Musi by 4.22 is smaller than specification coefficient. This indicates that the cooling system is working properly optimal.
ANALISA PERFORMA KERJA STERILIZER OF CRUDE PALM OIL Abdul Latif Mubarok; A. Sofwan; Bismantolo, Putra
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25455

Abstract

Boiling is one of the main factors that determine the success of the palm oil production process. Palm oil processing mills obtain Crude Palm Oil (CPO) through a boiling process at the sterilizer station to separate loose fruit and empty fruit, which will then be pressed into CPO. Boiling at the sterilizer station used is saturated steam with a pressure of 1.5-3 bar which is injected from the back pressure vessel (BPV). The selected boiling system is always adjusted to the ability to provide steam at the boiler station that produces steam. In this case, the supply of steam is considered sufficient, so that the boiling system used is the Triple Peak system, and the boiling time is ± 90 minutes.
MODAL ANALISIS PADA ROTARY KILN DENGAN MENGGUNAKAN METODE ELEMEN HINGGA Wahyu Rahmat Hidayat; Dedi Suryadi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25456

Abstract

This research is based on the general damage to the rotary kiln due to continuous use. Then the results from the burned in a Rotary Kiln So we need a prevention to overcome it. Testing the vibration mode on a rotary kiln machine is a solution to overcome the limit on the use of the finite element menthod. With the completion procedure of finite element software with the step of Rotary Kiln Geometry Modeling Process, Rotary Kiln Geometry Import Process, Rotary Kiln Geometry Import Process, Material Data Input Process, Meshing Process, Determination of Boundary Conditions, Running Process, and Port Processing. The results of this study are from the finite element simulation obtained in the form of the frequency value of the natural response of the structure and the deflection due to vibrations that occur in the rotary kiln Indarung IV PT Semen Padang. And it was concluded that the vibration mode experienced by the rotary kiln has a natural frequency value, the vibration mode of the rotary kiln structure obtained a maximum value of 63.3 Hz, while the minimum value obtained a value of 41.805 Hz. The maximum deflection of the rotary kiln is obtained from the analysis results of 0.058981 mm while the minimum deflection value is 0.045 mm.
ANALISA KOROSI PADA TANGKI REAKTOR TRIGA 2000 MENGGUNAKAN METODE INSPEKSI ULTRASONIK DAN INSPEKSI VISUAL (UNDERWATER CAMERA) Shafira; Hendri Hestiawan; Bismantolo, Putra
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25457

Abstract

A reactor is a process device where a reaction takes place, be it a chemical or nuclear reaction and not physically. Nuclear reactors are used for various purposes, namely to create, regulate, and maintain a nuclear chain reaction at a constant rate. One method of monitoring corrosion is using an ultrasonic device to measure the thickness of the tank wall and an underwater camera tool to visually see the damage that has occurred and will provide a quantitative estimate of the corrosion rate that occurs in the system by comparing the initial weight and weight after a certain time. The corrosion rate value on the TRIGA 2000 reactor wall is obtained through the weight reduction method, and has an average corrosion value of 0.10 mmpy, while the type of corrosion that occurs on the TRIGA 2000 reactor wall is the type of intergranular corrosion. protective coating by coating organic compounds (lubricant) and controlling humidity and temperature.
PENGARUH PEMBEBANAN TERHADAP ARUS EKSITASI PADA GENERATOR Hamdan Rizal Maulana; Agus Suandi; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25458

Abstract

The generator in the hydropower system is used to convert mechanical energy originating from the turbine rotation into electrical energy by producing an electromotive force. Excitation is one of the most crucial parts of the Generator system, where excitation plays a role in forming/producing electromagnetic flux, resulting in an induced emf. The amplifying current is used to adjust the magnitude of the output voltage according to the applied load. The tool used to regulate the excitation current is the Automatic Voltage Regulator (AVR). The differential loading on the generator changes every time. Therefore a power plant must be able to generate electricity in accordance with the magnitude of the changing load. In power generation, these loading fluctuations can be overcome by adjusting the water valve opening and the excitation current flowing to the electromagnet coil on the generator rotor with constant rotor rotation by the AVR so that electric power is generated according to the applied load. The purpose of this study is to analyze the effect of the load on the excitation current. The results obtained are the load has an effect on the excitation current.
PENGARUH VARIASI INFILL DAN SPEED PRINTING TERHADAP SIFAT MEKANIK ADDITIVE MANUFACTURING Fernando Desfriandi Saragih; A. Sofwan FA; Yovan Witanto
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25459

Abstract

Additive Manufacturing (AM) is a production process that does not remove or remove some of the material in the production process but adds material. The added material is extruded by means of Fused Deposition Modeling (FDM) technique. The way it works is to create a number of layers or layers one on top of the other. The software application used is Inventor to create 3D models in the form of STL files. Then the STL file is opened in the Ultimaker Cura (UC) application, to create a Numerical Code in G-Code which is used as a control on a 3D printing machine. The filler material used to produce molds is Polylatic Acid (PLA). PLA filament is very widely used in the manufacturing process, because this PLA can produce strong and very neat prints. The general print temperature of PLA is between 180oC to 220oC. The purpose of this test is to find out the steps for implementing the AM process and to analyze the mechanical properties of the AM product using the FDM technique. In this study, the printed material was based on ASTM D638 type IV. This research was conducted to determine the effect of variations in infill and printing speed on printed results, with a horizontal orientation of the printing angle of 0o. The infill variations are line infill and concentric infill with printing speeds of 50mm/s and 60mm/s. The research procedure is to make a 3D printing model, the manufacturing process, and the testing process. The results showed that the choice of infill and speed printing variations had an effect on the mechanical properties. The mechanical properties of printing products differ according to the mode and speed. The infill line mode provides greater mechanical strength than that produced in concentric infill. At a speed of 60 mm/s, the product strength of the infill line mode is 32.5 MPa greater than the 27 MPa strength of the printed product from the concentric infill mode.
MAINTENANCE DAN INSPECTION PADA RUNNER TURBIN AM Saifutaqi Fatwa Mayfi; Nurul Iman Supardi; Angky Puspawan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2022): Oktober 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i2.25460

Abstract

The PLTA TES is a generator that relies on water as the driving force for a turbine unit system. There are 7 PLTA Tes turbine units that are still operating with alternating working hours. In keeping a turbine unit operating properly, one way is to do maintenance and general inspection (GI). Maintenance is one way to keep a tool or object from being damaged. Then General Inspection (GI) is a process of activities in the PLTA Test company in checking, measuring, adjusting, repairing and testing one turbine unit in operating for 20,000 hours on a regular basis so that the unit can operate better than before, maintenance is carried out. One of the turbine components that is the object of maintenance is the runner. The runner is the heart of a turbine so that it can operate by relying on flowing water so that the runner can rotate. Runners are given a spot check to see if there is a crack in the runner's condition and measure the runner's clearance so that there is no excessive friction when the runner is operating and the runner is not thirsty.

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