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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.
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Articles 14 Documents
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Search results for , issue "Vol 10, No 3 (2019)" : 14 Documents clear
Optimasi Parameter Proses Bubut Material ST 60 dengan Pendinginan Ramah Lingkungan Menggunakan Metode Taguchi-Grey Pamuji, Dian Ridlo; Lusi, Nuraini
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.5

Abstract

Every production process always needs to produce high quality with high productivity. However, in machining processes, qualities such as surface roughness and productivity such as material removal rates have different characteristics. Surface roughness has the quality characteristics smaller the better, while the material removal rate has larger the better. Therefore, determining the combination of lathe parameters is very important to get optimal results. A study has been carried out to determine the combination of lathe process on ST 60 material with an environmentally friendly cooling method to minimize surface roughness response and maximize material processing rates simultaneously. The coolant (cold soluble oil and air pressure), spindle rotation (550 rpm, 700 rpm and 1200 rpm), feed motion (0.053 mm / rev., 0.103 mm / rev and 0.161 mm / rev) and depth of cut (0.125 mm, 0.25 mm and 0.5 mm) were used as process parameters. The tool used in this study is a CNMG insert tool with a 0.4 mm corner radius. The experimental design was determined using the Taguchi method in the form of orthogonal matrix L18 (21x33). The optimization method used is the grey relational analysis. The results showed that an optimal surface roughness response and material removal rate obtained by setting the coolant process at level 1 of cold soluble oil, spindle rotation was set at level 3 at 1200 rpm, feeding motion was set at level 3 of 0.161 mm / rev. And the depth of cut is set at level 3 of 0.5 mm.
Pengaruh Derajat Pengapian terhadap Kinerja Motor Bakar 6 Langkah Berbahan Bakar Etanol Razi, Misru; Siswanto, Eko; Wijayanti, Widya
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.10

Abstract

The six-stroke spark ignition engine has the potential to be developed as a new alternative to future motor fuel technology. The development of motor vehicles will be directly proportional to the use of rising fossil fuels. It is, therefore, necessary to have renewable alternative fuel, in which one of them is using ethanol fuel. Characteristics of the ethanol fuel are different from fossil fuels so the ignition timing is needed to be modified. The purpose of this study was to determine the effect of the ignition degree on the performance of a 6-stroke spark-ignition engine fuel using ethanol. This research is worked out directly by experimental and testing on the intended object. The test was carried out on an ethanol-fueled 6-step spark ignition engine with variations in the ignition angle at 240,260 and 280. Each variation was tested for a rotation interval of 600 rpm from 2400 rpm to 7200 rpm. The results show that ignition degree greatly affects performance. The ignition angle of 280 produced better torque, effective power, effective specific fuel consumption and effective thermal efficiency than those of the ignition degrees at 240 and 260 (standard angle ). This is due to the use of ethanol fuel which has a slower combustion speed. Based on this fact, it is necessary to advance the ignition angle so that the explosive power of the air-fuel mixture is increasing. Low fuel consumption and better effective thermal efficiency were observed for 280 ignition degrees compared to 240 and 260 ignition degrees.
Pengaruh Komposisi 2.9% dan 3.8% Si terhadap Kekuatan Lelah Besi Cor Kelabu Ekaputra, I Made Wicaksana; Litaay, Arnold A. I.; Setyahandana, Budi
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.3

Abstract

The addition of Silicon (Si) on the gray cast iron can initiate graphite dispersion where the graphite becomes smaller and more evenly distributed. This study investigated the effect of Si concentration of 2.9% and 3.8%  on the fatigue strength of the gray cast iron. The Si was added by the casting process with the open ladle method. The specimens were manufactured by following the ASTM E-466. Several tests such as tensile test, Brinell hardness test, and microstructure observation were conducted prior to the fatigue testing. The results showed that the Si concentration of 3.8% tended to increase the tensile strength up to 1.3%, the hardness up to 7.6%, and fatigue limit up to 10%. Moreover, the fatigue fractured specimen of 3.8% Si showed the combination of type A and type B graphite where graphite is smaller and more evenly distributed. In addition by applying the logistic equation, the fatigue strength can be predicted well.
Pengaruh Kecepatan Pengadukan Proses Rheocasting terhadap Struktur Mikro dan Fluiditas Paduan Al-Cu Putra, Muhammad Rezki Fitri; Suprapto, Wahyono; Sonief, Achmad As’ad
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.6

Abstract

Rheocasting with the aim of developing and offering solutions to problems related to the casting process. Rheocasting is a casting process that utilizes solidification agitation to change the dendritic structure to non-dendrite (globular) by giving a variation of the stirring speed. Al-Cu is a metal material that has high strength-to-weight ratio characteristics from steel, good fatigue resistance, and heat-treatable. But fluidity is low, this triggers casting defects such as shrinkage and miss-run. The defect occurs because the cooling process of liquid metal is not uniform or there is gas trapped in molten metal. Defects in casting can significantly reduce material mechanical properties. The results show morphological changes in the dendrites to rosette to globular with increased stirring speed and grain diameter decreasing with increasing stirring speed. Increasing the stirring speed also produces a positive trend of the fluidity value of Al-Cu alloys in each mold thickness.
Pengaruh Tegangan dan Waktu pada Proses Elektropolishing terhadap Surface Roghness Material Stainless Steel AISI 316L Widodo, Teguh Dwi; Raharjo, Rudianto; Kusumaningsih, Haslinda; Bintarto, Redi; Siswoyo, Redi Cipto; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.11

Abstract

The purpose of this work is to reveal the surface roughness and topography of AISI 316L stainless steel due to electropolishing processes. In this paper, AISI 316L was electropolished in various times of immersion and various voltage of the processes. The mechanism of electropolishing is eroding the surface of the substrate by controlling the electron excitation process. The electropolishing processes were carried out at 4, 5, and 6 minutes also in three different voltage 4, 6, and 8 volts. The results show that the surface roughness decrease as the treatment time and also as an increase in voltage.
Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar Gunawan, Chandra; Siswanto, Eko; Yuliati, Lilis
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.1

Abstract

The duration of fuel-air diffusion in the 4 stroke combustion engine is relatively short, which is 0.02 seconds at 3000 rpm so that at high rotation the level of homogeneity of the fuel-air mixture becomes low. The addition of steps in a 4 stroke combustion engine to a 6 stroke combustion engine is expected to increase the duration of mass diffusion and temperature in the air-fuel mixture. So that the homogeneity of the air-fuel mixture increase and more expansion power of the combustion results. Engine performance testing by reducing the engine speed of 400 rpm at the initial condition of the throttle valve opening by 30% then the results of the performance of the two motors will be compared. The test results show an increase in power and torque in a 6 stroke combustion engine compared to a 4 stroke combustion engine at the same rotation conditions of 15%. As for the value of the specific fuel consumption effective (SFCe), thermal efficiency, and exhaust gas emissions of Hydrocarbon (HC) 4 stroke fuel is still better.
Desain dan Konstruksi Mesin Penyemai Benih Sayuran Portabel Tipe Vakum untuk Pembibitan pada Talam Semai Sagita, Diang
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.7

Abstract

In Indonesia, vegetable seeding technique in nursery plug trays still uses manual mechanism. Furthermore, the small size of vegetable seeds makes it difficult to allocate the seeds evenly (1 seed per planting hole). This study aims to design and construct a portable vegetable seeder with a vacuum-type mechanism for nursery needs in plug trays. The methods used in this study were: 1) preliminary test of seed characteristics, 2) functional analysis of the design, 3) structural analysis of the design using CAD, 4) fabricating a prototype, and 5) performance test of the seeder prototype. Seed characteristic used as reference analysis was mustard green seeds. The nursery plug tray used was TS-128L tray (128 planting holes). The results show that the suction requirement of the seeder was 23.119 Pa and the seed suction holes diameter was 1 mm with a cone angle of 120o. The overall dimensions of the machine are 585 × 430 × 105 mm with 5.26 kg of weight. The suction power uses 220 V AC electric blower with 1.5 A of electric current, 2.5 inches of inlet hole, 3600 rpm of blower rotation and 412.02 Pa of suction power (bigger than the suction requirement of the seeder). The performance test results of seeder using mustard green seeds have been able to achieve the uniformity level of 93.75% (1 seed per planting hole), germination percentage of 95.05% and seeding capacity of 102 trays/hour.
Pola Aliran Dua Fase Gas - Fluida Non Newtonian Melalui Belokan Pipa Kusumaningsih, Haslinda; Hamidi, Nurkholis; Sabila, Adriazka Fasa
Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.12

Abstract

Two-phase flow applications can be used in chemical reactors, fuel cell and a cooler of electronic devices. Nowadays, the study on multiphase flow is concern with the gas-non Newtonian liquids flow. Since, non-Newtonian liquids commonly used in both industrial and medical applications such as blood flow, polymer and chemical solutions. The viscosity of a non-Newtonian liquid cannot be described by Newton?s law viscosity. The viscosity will affect flow behavior in pipes depends on the rheology of the fluid. The purpose of this study is to further investigate the flow pattern characteristic of gas-Newtonian/non-Newtonian liquid two-phase flows in a normal channel. Ultrapure water, polyacrylamide aqueous solutions (PAM) were used as test fluids, while argon gas as the test gas. Liquid and gas were introduced in T-junction, which placed on the upstream of the test section. In this study, the polyacrylamide concentration was variated on 0.1% wt and 0.4% wt. Moreover, the flow rate of liquids tested were variated on 0.1167 m3/s, 0.183 m3/s, 0.25 m3/s; and 0.283 m3/s. Therefore, the gas tested was variated on 0.083 m3/s, 0.167 m3/s, and 0.25 m3/s. The circular channel and bend pipe were used in this study, which has hydraulic diameter of 25.4 mm. The high-speed video camera was used to record the flow patterns in the bend as the test section. The flow pattern, bubble length, bubble velocity and void fraction were determined by analyzing the video image of the flows. Slug and plug flow patterns mostly appear in this study for each variation of liquids tested. Increasing gas superficial velocity induced the longer bubble. Furthermore, because of the higher viscosity of the non-Newtonian liquid,  the bubble nose of gas-non Newtonian liquid two-phase flow becomes sharper than the bubble nose of gas-Newtonian liquid two-phase flow. 
Pengaruh Jenis dan Ukuran Biomassa terhadap Proses Gasifikasi Menggunakan Downdraft Gasifier Mufid, Faishal; Anis, Samsudin
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.2

Abstract

Biomass is alternative energy. This research was conducted to determine the effect of biomass type and size on the gasification process using a downdraft gasifier. Sengon and mahogany woods were used as the feedstock. The study began by conducting a proximate test of biomass feedstock to find out its properties. Than the gasification process was studied by using two sizes of biomass i.e. wood chips and blocks. Each experiment was carried out for 90 minutes and 10 kg of biomass. The air was supplied at 3 m/s. The results showed that the type and size of biomass affected the gasification temperatures, flame characteristics, and residues. Sengon wood chips provided the highest gasification temperature of 1239°C in the oxidation zone with a flame duration of 77 minutes and residue of 9.1 wt.%. For mahogany wood chips in the sequence were 1220°C, 68 minutes and 16.25 wt.%. Meanwhile for wood chips mixture of sengon and mahogany gave the flame duration of 55 minutes and residue of 15.65 wt.%. Overall, it can be concluded that under the investigated condition, a sengon wood chip was found to be the most suitable biomass for the downdraft gasifier used in this work.
Pengaruh Fraksi Volume Komposit Polyester Berpenguat Limbah Serbuk Kayu Bangkirai terhadap Sifat Material Akustik Laksono, Andromeda Dwi; Ernawati, Lusi; Maryanti, Desy
Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.8

Abstract

The use of Glasswool as a commercial sound absorber is growing rapidly nowadays. Unfortunately, this material contains a high silica fiber which is harmful to human health. Herein, we present an improved preparation route of the composite material consisted of natural fiber made from Bangkirai wood waste (Shorea Laevifolia Endert) as a filler and unsaturated polyester as a matrix through hand lay-up method. The absorption testing, reflection, and sound transmission were performed by varying the volume fraction 0, 20, 40, and 60% of Bangkirai wood powder as a filler. It was obtained that the highest value of the sound absorption coefficient (?) contained in the composite with a 60 % volume fraction, which is 0.49, which still approaching the Glasswoll as the standard frequency. The value is also included in the category of Sound Absorption Coefficient Class D with the range 0.30-0.55 based on ISO standard 11654. From the obtained results, this composite material has the potential ability to absorb sound in controlling noise and possibility as a commercial sound absorber.

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