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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
 1   2   3   4   5 
TRY AND ERROR OPTIMIZATION OF SERVOHYDROLIC CONTROL SYSTEM FOR A PRESS MACHINE Nasril, Nasril; Hendra, Hendra; Siagian, Indra S
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9854

Abstract

Servo hydraulic control valve system of Aerotech A3200 was setted for press machine made by BPPT-MEPPO by such method a high accuration can be achieved for the geometry of workpiece. Parameters being tested were the input unit (step), time (ramp) and frequency (bode) to predict occuring circumstances and compared with experimental results. KPos affected on steady-state error value, time-setting and Fc. Ki affected on the steady-state error without changing the value of Fc and PM and errors transition, where in the value of the steady state error was inverted to the error transition. KP eliminated the steady-state errors. The optimized setting was achieved at Kpos = 28.5, Kp = 2.000.000, and Ki = 1970 with error transition state 66 µm and 3 µm steady. In PM = 89 deg with Fc = 177 hertz.
INHAUST AND EXHAUST VALVES GAP EFFECTS ON AN ENGINE PERFORMANCES Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9855

Abstract

Valves is the part in an engine determining engine performance. The setting of the valves is to determine the composition of air and fuel in their combustion room. The mixing of the air and the fuel is the key of the engine performance. Dinamometer test was being conducted for the gap variation of the valves of 0.03 mm, 0.05 mm, and 0.07 mm each either for inhaust valve and exhaust one. The optimum of the engine performance of gasoline fuel as measured from the torque, the power, and the specific fuel consumption was at 0.05 mm of both.
HEATSINK 3D BY CFD ANALYSIS OF COOLING SYSTEM IN A PC DESKTOP Sulung, Sukma; Mainil, Afdal Kurniawan; Suandi, Agus
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9856

Abstract

Heatsink was analyzed by using CFD to entirely model temperature distribution over VGA. It was set up on two conditions, standby and maximum load. At the standby condition the temperature on the 21 fin was 44.77 °C by CFD and it is comparable to 44.20 °C by direct measurement. While at the maximum load condition the temperature on the 12th fin was 61.78 °C by CFD and it is comparable to 59.80 °C by direct measurement. The simulation error  of the analysis was 0,97% - 1,29% of the standby and 3,31% - 3,92% of the maximum load.
FAILURE CASE STUDY OF SKF 6005 CARRIER IDLER BEARING Erinofiardi, Erinofiardi; Suryono, Ahmad F; Sitohang, Noverson T
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9857

Abstract

A conveyor idler belt is to serve as buffer in a transportation system of coal from the land to a ship the carrier of coal. The idler was loaded by 700 tons per hour. From the simulation, the bearing on the slant has a maximum value of von mises stress is 258.05 MPa by the crushed bituminous coals load, 340.09 MPa by the crushed anthracite coal, 528.26 MPa by crushed bituminous coals impact loads, 692.28 MPa by the crushed anthracite coal impact loads. The bearing age for crushed bituminous coals transportation is 278.81 days for 21 hours per day of service hour and 117.44 million round revolution; 139.6 days for the crushed anthracite coal and 58.81 million round revolution; however the pads located on the bottom right of transfer chute has a very short life of 22.62 days and 9.53 million round revolution for the crushed anthracite coal transportation and 47.24 days for crushed bituminous coal transportation and 19.9 million round revolution. The crack type of bearing was macro crack, pear skin, discoloratioan, wear, smearing, and corrosion. Periodic maintenance was necessary keeping the bearing longer in service life.
HEAT TREATMENT EFFECT ON MECHANICAL PROPERTIES OF JIS SCM4 STEEL Hestiawan, Hendri; Zuliantoni, Zuliantoni; Febriyanto, Dwi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9858

Abstract

It is about steel JIS SCM4 of 0.39% C, 0.28% Si, 0.77% Mn, 0.95% Cr and 0.17% Mo composition. The steel was heated to improve the mechanical properties. The heat treatment was applied on  a cylindrical specimens of 20 mm diameter at 850 C for 30 minutes. The heated samples were then quenched into media of oil, coconut oil, kerosene, water and the other was annealed. The quenched specimens were tempered at 300 °C for 30 minutes. Testing of mechanical properties was tensile and hardness tests. The lower viscosity of the quenchant gave the tensile stress and hardness higher. The highest one  was about 1779 MPa and 52 HRC of specimens quenched to water and  the highest strain was achieved as high as to 21.76% of the annealed one. The microstructure of the  quench-temper was martensitic phase, and ferritic-pearlitic of the annealed.
FABRICATION ASPECT PRICING OF SCREW TURBINE FOR A MICRO HYDRO ELECTRICAL GENERATOR Hendra, Hendra; Surbakti, Filo C
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9860

Abstract

Screw turbine for a micro hydro power generator (PLTMH) is to utilize  water flow as electricity generator by screw rotation. The screw was made in two parts, each consists of shaft and blade. The dimension (mm) was 1300 length, 165.5 diameter of shaft axis and 200 blade height with 5 thickness. The first part was different from the second in number and pitch of the blades. The first consists of 5 blade plates by 260 pitch, the second one 7 blades by 185.7 pitch. The fabrication of the screw was completed through series of processes, i.e. plate cutting, plate flatening, pressing, rolling, welding, and balancing. The first part costed Rp. 12.780.000 and the second one Rp. 13.430.000.
CHARACTERIZATION OF WASTE PET POWDER AS ATOMIZATION PRODUCT Pamuji, Hari; Alqap, A Sofwan F; Suandi, Agus
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9861

Abstract

A nozzle of diameter 25 cm of a closed coupled type was set at an outlet gap 0,05 mm to atomize polyethylene terephthalate plastic wastes. Parameters of pressure and heating temperature were varied into 5 bar, 6 bar and 7 bar pressures, and at 275?C, 285?C and 295?C heating. A vessel to collect the product was 40 cm diametrally away from the nozzle mouth. The products were the form of powders, yarn and liquid. The powders were only 4,77%, 6,45% and 2,94% of each heating temperature aforementioned.
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.

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