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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
Arjuna Subject : -
Articles 728 Documents
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Pengaruh Diameter Inner-Helical Fin Terhadap Characteristic of Performance Counter Flow Heat Exchanger Bula, Muhamad; Wahyudi, Slamet; Hamidi, Nurkholis
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The study of energy conservation using the head exchanger with different fin shapes havebeen carried out, including research on the counter flow heat exchanger using a helical spiral shaped fin is placed on the inner pipe. The problem lies in the acquisition of the influence of the diameter of the helical fin to the characteristic of performance counter flow heat exchanger. The diameter of the helical fin which the test is 8 mm, 12 mm and 16 mm. The objective is achieved, the effect of the diameter of the helical fin characteristic of performance counter flow heat exchanger in the increase of hot water discharge 400 liters / hour, 500 liters / hour, 600 liters /hour, 700 liters / hour, 800 liters / hr and 900 liters / hour. Method of design of experiments with laboratory-scale experiments using a set-up equipment double tube heat exchanger is the method used. The results obtained, the highest effectiveness for all types of helical fins foundon discharge 400 liters / h with the order from highest to lower the effectiveness of internal diameter of 12 mm reached 17.66%, diameter of 8 mm effectiveness reaches 15:56% and the internal diameter of 16 mm effectiveness of achieving 14.29%. For the plain tube efektiftasobtained 11:48%.Keywords : heat exchanger, the diameter of the helical fin, hot water discharge, effectiveness
Pra Studi Kelayakan Potensi PLTM/PLTA Di Area PT. PJB Unit Pembangkit Brantas Budiono, Budiono; Wahyudi, Slamet; Sutikno, Djoko
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In accordance with government policy to further optimize the utilization of renewable energy sources, and the policy of PT. PLN (Persero) to reduce the consumption of primary energy derived from fuel, then the PT Pembangkit Jawa-Bali (PT. PJB) plans to optimize the utilization of water resources in the Area PT. PJB Unit Pembangkitan Brantas that have the potential to be developed into minihyro power plants / hydro power plant with a capacity of under 10.0 MW. One purpose of this study is to anticipate the demand for electricity is increasing every year as well as to reduce dependence on primary energy derived from fossil tend thinning, as well as the concern of PT. PJB to environmental sustainability and clean development.Keywords : Pre-Feasibility Study, Potential of Minihydro Power Plants / Hydro Power Pant.
Optimasi Parameter Pemotongan Mesin Bubut CNC Terhadap Kekasaran Permukaan dengan Geometri Pahat yang Dilengkapi Chip Breaker Wibolo, Achmad; Wahyudi, Slamet; Sugiarto, Sugiarto
Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In machining operation, the quality of surface finish is an important requirement for many turned workpieces. Thus, the choice of optimized cutting parameters is very important for controlling the requied surface quality The focus of present experimental study is to optimize for cutting speed, feed rate, and radius chip breaker using two performance measures, metal removal rate and surface roughness. Response Surface Methodology (RSM). has been applied for developing models in the form of multiple regression equations correlating dependent parameters with cutting parameters and radius chip breaker, in a turning process. The central composite rotatable design was used to plan the experiment, and analysis of variance were employed to study the performance characteristics for three variable independent in turning operation. A second-order model which can describe the relation then to find combination between cutting parameters and radius chip breaker which resulting the maximum metal removal rate and minimum surface roughness. The experimental results reveal that the most significant cutting parameters for surface roughness is cutting speed, followed by feed rate and radius chip breaker. Based on the optimization results, recommended cutting speed, feed rate, and radius chip breaker is 35 m/mt, 0,2819 mm/rev, and 0,85 mm. By implementing this parameters, the surface roughness and metal removal rate is 2,18 μm and 6230,80 mm3/mt.Keywords : Surface Roughness, Metal removal rate, response surface methodology, turning
Pengaruh Ketebalan Inner-Helical Fin Terhadap Charcteristic of Performance pada Head Exchanger Usman, Ishak; Wahyudi, Slamet; Argo, Bambang Dwi
Jurnal Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Effect of inner-helical fin on the rate of heat transfer and flow friction factor in a double pipe heat exchanger (double tube heat exchanger) to make a split and disrupt the flow pattern of a streamlined flow of the fluid flowing in the pipe section in the (inner tube) that cause turbulence (molecule-molecule level of randomness good fluid) that can increase the heat transfer rate in the the pipe . Inner-helical fin has a varied thickness of 1 mm, 22 mm and 3 mm are mounted on the pipe where the inside diameter of the inner-helical fin attached to the wall in the inner pipe. Hot water discharge on the inner pipe ditelitil ranging from 400 to 900 liters / h with interval increase in 100 liter / hour and the volumetric flow rate of cold water on the outer tube (outertube) is kept constant 900 liters / hour. The test results of each inner-helical fin thickness compared with the test results without the inner-helical fin (plain tube) and obtained the overall heat transfer rate has increased 60 to 65% of the plain tube, heat exchanger effectiveness of58.56 to 63, 64% and friction factor of 63.13 to 63.51 of the plain tube.Keywords : Inner-helical fin, Heat exchanger, rate of heat transfer, friction factor
Desain Unit Pengolahan Bioetanol untuk Petani di Desa Ngajum Kecamatan Sumber Pucung Kabupaten Malang Guritno, Bambang; Argo, Bambang Dwi; Yulianingsih, Rini
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The aim of the research is to develop bio-ethanol processing unit in small size using simple technology, which can be used by Cassava farmers in the village of Ngajum Sumber Pucung Malang. The capacity of Bioethanol processing unit provided is 100 liters/process which consists of sieve, cooker with cooling mash, fermenter, and distillation unit. Tests on several processing units give the following results: Sieve driven by 7.5 HP diesel engines. Sieve cylinder made of wood cylinder with 40 cm of diameter and 45 cm of length. Sieve has a capacity of 613 kg/h. Cooker tank made of stainless steel plate 4 mm and has dimensions 77 cm of diameter and 150 cm of height. There are 4 pieces of pipe stainless steel 6" placed at the bottom serving as heat exchanger. Cooling Mash has heat transfer surface area of 3.11 m2 that consists of 26 stainless steel pipe 1 ½" of diameter and 100 cm of length . Cooking efficiency is 38% with fuel of firewood with a moisture content of 50%. At steady state conditions, Cooling mash is capable to remove energy from substance of 280 kcal/min at mass flow rate of substance of 2.34 l/s and mass flow rate of cooling water of 0.6 l/s.Fermenter tank has made of stainless steel and has dimensions 110 cm of diameter and 240 cm of height. The mixer’s fermenter is driven by a ½ HP electric motor. To maintain the material temperature at 32 oC, the fermenter equipped with a cooling unit that is sprinkler water around the tube. Distillation unit has made of stainless steel 304 and consists of beer column, the column rectifying, pre-heater, condensers and equipped with boiler.Keywords : Performance, Bioethanol Processing Unit, Small Scale.
Pengaruh Kuat Arus dan Waktu Pengelasan pada Proses Las Titik (Spot Welding) Terhadap Kekuatan Tarik dan Mikrostuktur Hasil Las dari Baja Fasa Ganda (Feritte-Martensite) Agustriyana, Lisa; Suryawan, Yudi; Sugiarto, Sugiarto
Jurnal Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research was conducted to investigate the appropiate spot welding variable to get the maximum tensile strength. The highest of tensile strength referred as good quality of weldment.The plate was made from low carbon steel with phase ferrite and martensite. The current of welding used 0.9 kA, 1.6 kA, dan 1.85 kA with welding time were 0.25, 0.5 , 0.75 and 1 second. Mechanical properties testing done involved tensile strength to know shear strength of weld joint. Microstructure test used optical microscope.The results show that spot welding with thecurrent of 1.85kA and welding time of 1 second has the highest tensile strength (about 237.04N/mm2). On the other hand, the lowest tensile strength (150 N/mm2) was produced by combination of 0.9 kA and 0.25 second welding time. It was caused by recrystallization phasedeformation on steel.Keywords: current, welding time, tensile strength, spot weld
Pengaruh Penambahan Tongkol Jagung Terhadap Performa Pembakaran Bahan Bakar Briket Blotong (Filter Cake) Hamidi, Nurkholis; Wardana, ING; Sasmito, Handono
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Studies have been carried out on utilizing agricultural wastes of corn cobs to enhance the properties of filter cake briquette. Briquettes of mixtures between filter cake and corn cobs were produced in order to increase the fiber content and reduce the ash content. In this study, the concentrations of corn cobs were varied at 0%, 2%, 6%, 10%, and 15%. The properties of the briquettes were compared. It was found that the burning rate, caloric value, burning temperature and combustion efficiency showed improvement with increase in corn cobs concentration. Keywords : filter cake, corn cobs, combustion performance
Dampak Perubahan Temperatur Lingkungan Terhadap Temperatur Puncak Las Dan Laju Pendinginan Sambungan Dissimilar Metal Menggunakan Las Mlg Sugiarto, Sugiarto; Wahyudi, Ari; Masduki, Masduki
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The failure of dissimilar weld joint happen to train contructions because of unweld joint quality optimal.This research used MIG welding with CO2 gas shield. The welding current used was 110 Ampere with wire diameter 0.8mm, welding velocity 2 mm/s, gas rate of CO2 was 5L/mnt. Temperature measurement distance towards welding center was 5 mm and 10mm. The joint plate was low carbon steel ST37 and austenitic stainless steel SS 304 with thickness 4mm. In order to obtain the temperature, thermocouple was used complated with ADC and computer to display and graph. Enviroment temperature was variated with room temperature 100 ºC, 200 ºC and 250 ºC. The low peak temperature cause cooling rate post welding deacreased, which was shown trough the decreasing shape of cooling graph. The higher the enviroment temperature, the lower welding peak temperature. It happen to both ST37 and SUS 304. The peak temperature and cooling rate post welding of SUS 304 was lower than ST37. The distribution of peak temperature similar the incrase of enviroment temperature. The most similar and lowest peak distribution of enviroment temperature was obtained 250ºC. Keywords: Thermal cycles, cooling rate, dissimilar metal, MIG welding, enviroment temperature.
Pengaruh Parameter Proses Freis Terhadap Kekasaran Permukaan Baja Karbon Fasa Ganda Arifin, Nur Mohammad; Sonief, Achmad As'ad; Atmodjo, Winarno Yahdi
Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Dual phase is a new structure at low or medium carbon steel. The structure is obtained from the heating of low or medium carbon steel in the region α + γ (temperatures between A1-A3), then follow by holding process within a certain time and cooled quickly (quench) in water,brine or oil. The result has a microstructure of martensite and ferrite as well as a few otherstructures. The steel usually has high tensile strength, good elongation and there is no discontinuity yield. The problem is how the influence of parameters milling process on surface roughness the dual phase carbon steel The purpose of this study was to determine the outcome Freis CNC cutting conditions due to the formation process of double and tempering phase that begins with the process of forging (forging) on carbon steel .This study used AISI1045 steel Ø16mm x 150mm diameter, which was forged at a temperature of 950oC-900oC to form a rectangular cross section with a size of 10mm x 16mm x 180mm. Dual-phase heating was continued at a temperature of 770ºC, arrested at 90 'and cooled rapidly in oil , followed by atempering process 600⁰C/30 '. The process of cutting was done by cutting finishing with feeding 0.12; 0.14; 0.16 mm / put and depth of cut 0.4; 0.6; 0.8 mm while roughing cuts by feeding 0.2;0.4; 0.6 mm / put and depth of cut 1.2, 1.4;a1.6amm .The result Depth of cut can affect the deflection. The deflection could be increased by increasing the depth of cut. The results obtained increase the level of surface roughness. On the depth of cut 0.4 mm with feeding 0:16mm / put the value obtained average roughness Ra 0.64 μm, including group N6 roughness when compared with 0.8 mm depth of cut with the same feeding value of average roughness Ra 1.08 μm including N7. Surface roughness increased by feeding could affect the feeding of 0.12 mm / put and 0.16 mm / put, 0.2 mm / put and 0.6 mm /put because the distance from the cutting peak roughness increases, so the roughness of the rough and the process of finishing cuts on carbon steel dual phase is more subtle than on the untreated carbon steel with the same cutting parameters.Keywords: forging, dual phase (dual phase), the cutting parameters
Optimasi Proses Sand Blasting Terhadap Laju Korosi Hasil Pengecatan Baja Aisi 430 Setyarini, Putu Hadi
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Corrosion is naturally occuring phenomenon and will be exist by itself in the metal. The metal will be damaged by an electrochemical reaction with its environment and can not eliminated but can do a variety of prevention efforts, such as by using a barrier layer that is in the process of painting. In the process, the quality of painting is paint adhesion influenced by surface roughness. The preparation can be done by themethod of spraying a sand blasting abrasive material in the form of sand forced into the surface of the material. sand blasting process could make the paint more durable and more resistant to corrosion. The parameter used in this study were sand blasting spraying pressure i.e 4;4,5;5;5,5 bar, sand blasting spraying angle 600; 750; 900. The results showed that the greater the pressure and angle of sand blasting, the corrosion rate is lower Average corrosion rate of the lowest occured at 5 bar spraying pressure and 900 spraying angle were 7.2157-E5; 7.1157-E5; 6.95-E5 mpy Keywords : sand blasting, corrosion.

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