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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 8 Documents
 1 
Search results for , issue "Vol. 3 No. 1 (2019): April 2019" : 8 Documents clear
PENGARUH PERLAKUAN ALKALI DAN SUSUNAN SERAT TERHADAP WATER ABSORPTION PADA KOMPOSIT HYBRID BERPENGUAT SERAT AGEL TENUN/SERAT GELAS/RESIN POLIESTER Hestiawan, Hendri; Jamasri, Jamasri; Kusmono, Kusmono
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9928

Abstract

The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10-12 m2/s respectively.The aim of this research is to investigate the effect of alkali treatments and stacking sequences on water absorption in hybrid composites of woven agel fiber/glass fiber/polyester resin. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standards. Water absorption test results show that alkali treatment with glass fiber arrangement on the surface effectively holds the entry of water into hybrid composites. This can be seen from the decrease in maximum water absorption (Mm) and diffusion coefficient of hybrid composite, which are 8,67% dan 5,74 x 10 -12  m2/s respectively
STEAM TURBINE ISENTROPIC EFFICIENCY OF TC 663 MY 140 TYPE-UNIT 4 STEAM POWER PLANT CASE STUDY IN PT. PLN (PERSERO), BUKIT ASAM SECTOR, TANJUNG ENIM REGENCY, SOUTH SUMATERA PROVINCE Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9930

Abstract

Coal is one of the important natural resources that can produce energy for electricity generation. Bukit Asam Steam Power Plant (PLTU) PT. PLN (Persero) is a state-owned company that is in charge of managing coal into fuel to produce electricity through the Rankine cycle with one of its main tools being a steam turbine. Steam turbines function to convert heat energy from the boiler to mechanical energy to rotate the turbine. Because the heat energy has enough pressure, temperature, and flow of steam to rotate the turbine rotor. If a steam turbine is used continuously to reduce the quality and isentropic efficiency of the turbine. Therefore, it is necessary to do some work analysis on turbines type TC663 MY 140 Unit 4, Bukit Asam Sector PLTU. From observing and retrieving data and the results of calculating steam turbines during a two-day operation, the average value of isentropic efficiency on the first day was 57.86% with a range of 56.19% -59.92% and 54.51% on the second day 44.29% 59.58%.So,the pressure and temperature of the steam turbine greatly affect the performance of the steam turbine where if the pressure and the inlet temperature of the steam turbine are large then the work of the steam turbine increases and vice versa. From the results of calculations and discussion it can be concluded that the steam turbine used in PT. PLN (Persero) is still working well.
PENGUKURAN RUNOUT PADA POROS POMPA VERTIKAL DENGAN MEMVARIASIKAN FEEDING DAN SUDUT PENAMPANG POROS Zuliantoni, Zuliantoni
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9931

Abstract

This study aims to do the machining process, measure runout using dial indicator on vertical pump shaft and examine one-way anova to see the effect of angles shaft circle section on the result of runout measurement on the pump shaft. The shaft of vertical pump was produced by a lathe machine. Calculating values the cutting speed, calculating points the theoretical machining time, and measuring grade the runout using dial indicator at the angle 0o, 90o, 180o, and 270o with 10 points of measurement. The results of measurement of runout are carried out one-way ANOVA to see the effect of angles on average runout value. The results of measurement showed at the points of A, B, C, G, I, and J describing the value of runout exceeds level of permitted tolerance but the runout values at the point D, E, F, and H showed the value accepted because they were in below  of the tolerable allowance. The one-way ANOVA show that the average runout value at four cross section angles of the pump shaft were the same. The value at different pump shaft cross section angles did not show an effect on average runout value produced.
CONNECTING ROD FAILURE ANALYSIS UNDER MAXIMUM LOADING Suryadi, Dedi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9932

Abstract

Motorcycle is one of the public transportation consisting of several components. One of the main components is connecting rod, that is a connector part between the piston and crankshaft. Connecting rod is often getting damage, such as bent or broken. The damage is as the result of the continuously working connecting rod that caused a fatigue on components. Therefore, strength analysis is needed to be conducted to determine the cause of the damage on the connecting rod. The application of force on the mechanism crank must be considered especially in the analytical calculations and simulations. The object of this research is the connecting rod of motorcycle using AISI 1070 material. The finite elements model is applied on the model by using ANSYS workbench 14.0 software. The boundary conditions are also applied on the big end part is fixed suport, while at the small end is subjected to loads due to the dynamic motion of the system. As the results, maximum stress and safety factor are obtained. The maximum stress is 164.7 MPa and smaller end part with safety factor of 3.01. According to the result, the connecting rod is safe
FLOW CHARACTERISTIC OF HEAD DIFFERENCE PUMP AS ARRANGED IN SERIES AND PARALLEL Helmizar, Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9933

Abstract

Pump is a device used to move fluid. The pump moved the fluid from a lower pressure place to a place with higher pressure. If the head or pump capacity needed cannot be achieved using only one pump, it can use two pumps or even more which can be arranged either in series or in parallel. The research objective for pumps arranged in series and in parallel is to determine the characteristics of the circuit of two pumps each of which has different characteristics. In this study, data retrieval is done by measuring the pressure on suction and discharge using pressure gauge at pumps 1 and 2. Whereas to measure the flow rate of a pump arranged in series and parallel using a flowmeter installed on the discharge side of the circuit. This research was done by varied the valve openings on the pump discharge side 2 namely 2x1800, 4x1800, 6x1800, 8x1800 and full openings. From the results of tested the characteristics of the pump used water fluid on the series arrangement, the highest head value at valve opening 2 x 1800 is 30.99 m at discharge 0 LPM and the lowest head at valve opening 10 x 1800 (full) is 23.99 m at discharge 0 LPM. In parallel circuits, the highest head obtained is 16.99 m with 0 LPM discharge at 8 x 1800 valve openings and lowest head 14.99 at 0 LPM discharge occurs at full valve openings
PIPING AND BALLAST PUMP SELECTION FOR A TANK CARRIER SHIP Witanto, Yovan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9934

Abstract

Pump is a device used to move a liquid from a lower place to a higher place by giving energy to the liquid to be moved. Generally the pump is driven by a motor, turbine, engine, or the like.PT Daya Radar Utama Unit 3 Lampung company engaged in ship production or shipbuilding. On ships there is a balancing system or commonly called a ballast system which aims to balance the ship when the load is empty or full. Balancing used is in the form of sea water which is input into the ballast tank. Therefore there is a selection of pumps to adjust to the ballast reservoir used in a ship so that the time needed to fill the tank can be according to the needs. On warships carrying steel tanks, it is known that the volume of the ballast tank is1300m3with a planned time of 5 hours.  From the tank volume data that has been known, the capacity of the planned ballast pump can be calculated and the capacity obtained is260m3/h, the pipe diameter prediction value is suitable for use from the value of the ballast pump capacity of 8 "and the total head value is obtained to meet the needs based on the image design of the balaas system which is planned to be valued at 27.43m. From these data, the ballast pump can be selected according to the need for filling the ballast tank for 5 hours by selecting the pump specifications according to the total discharge and head obtained
SHELL LIFE TIME ANALYSIS FOR INSPECTION PLANNING OF HEAT EXCHANGER OIL REFINERY Suryono, Ahmad Fauzan
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9935

Abstract

Heat exchanger is a device where there is a flow of heat transfer between two or more fluids at different temperatures, where both fluids flow in the system. Fluids with a higher temperature will transfer heat to a lower temperature fluid. The shell and tube type is chosen because it has a good mechanical arrangement with a form that is good enough for pressurized operations. Many factors that affect the life span of a heat exchanger include thickness, the rate of reduction in shell thickness and corrosion rate. In this study, the calculation of the corrosion rate is a variable to get the value of remaining life in order to find out whether the shell is still feasible to use. And also know the limits of the process from the shell for further inspections obtained after performing minimum thickness calculations and MAWP. In this calculation carried out using International Standards namely API 660 and ASME Section VIII Division I with material ASTM A-285 Grd CFrom the results of calculations and analysis it was found that the estimated corrosion that occurred in the shell and tube heat exchanger 6-2A at the oil refinery for 14 years (2001 to 2015) amounted to 0.0857 mm/year and the Remaining Life (RL) which is 156.17 years. From these results it was concluded that the shell was feasible to be used until the year 2171. In addition, the MAWP value was also obtained at 5.414 MPa.
MAN POWER REDUCTION EFFECT ON RAIL BRIDGE FABRICATION van Hoten, Hendri; Nurbaiti, Nurbaiti
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9936

Abstract

The research is to analysis the effect of reducing manpower for production process railroad bridge WTT46.5 type. The purposed manpower reduction is to increased effective production process railroad bridge WTT46.5 type and reduction manpower cost. Reduction of Manpower happened in trial process with the number 15 people and separated in some part. On of the part is in welder that is reduction in one person. Manpower reduction in trial process to improve company finance by Rp.  4.645.620,00 in every project.

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