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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 6 Documents
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Search results for , issue "Vol. 6 No. 1 (2022): April 2022" : 6 Documents clear
ANALISA RESPON GETARAN PADA TURBIN FRANCIS DENGAN MENGGUNAKAN SINYAL SUARA M.Hapis Apmarwansahrowi; Dedi Suryadi; Helmizar
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.v6i1.25450

Abstract

Damage is very common in the PLTA Hydroelectric francis turbine, usually appearing on parts, clutches, gears, bearings, or other drive components. Proper fault diagnosis can help to reduce or even prevent breakdowns. To identify damage to the turbine can use sound signal analysis. This method analyzes using sound signals. By analogizing vibrations as sound waves produced by mechanical vibrations, it is hoped that the sound signal can be used as a parameter to determine the condition of the turbine. In this study, to get the best signal, a microphone is used as a sensor to capture sound signals which are placed on the guide bearing of the hydropower test turbine. The sound signal in the time domain is then transferred to a signal in the frequency domain using Fast Fourier Transform (FFT). The results of the test showed that there were 2 active frequencies, 1x rpm and 2x rpm at a turbine rotation of 500 rpm for 6 days of testing. These characteristics indicate the identification of the problem of the bent shaft on the turbine.
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.

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