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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 6 Documents
 1 
Search results for , issue "Vol 7, No 1 (2016)" : 6 Documents clear
Peningkatan Efisiensi Sistem Pemanasan dengan Penambahan Grid pada Perforated Burner Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (422.156 KB) | DOI: 10.21776/ub.jrm.2016.007.01.4

Abstract

Efficiency of a domestic gas stove depend on the kind of burner material and its configuration. In this study, a material in the form of a grid  has been inserted into combustion chamber  to modify flame characteristics. Grids made from stainless steel with different thickness were inserted between  burner and loading. Ceramic stove cover was used to prevent heat release from flame. To develop the term of efficiency of the system, many parameters were measured as energy from fuel, cover temperature and water temperature.  The results show that in certain fuel rate of 45 l/h, a heating system with  a grid of 5 mm has maximum efficiency of 58,8 %  indicate a differentiation of 5 % higher compared to the heating system with no grid. Grid material absorbs energy from combustion process, keep the temperature in  the combustion chamber remain high also induce turbulence upstream the grid surface causing fuel-air mixing  improved.
Analisa Heat Input Pengelasan terhadap Distorsi, Struktur Mikro dan Kekuatan Mekanis Baja A36 Wibowo, Heri; Ilman, M.Noer; Tri Iswanto, Priyo
Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (746.989 KB) | DOI: 10.21776/ub.jrm.2016.007.01.2

Abstract

The minimization of weld distortion has become an important subject of research in welding. Severe distortion can cause undesirable influence on the cost of fabrication since additional work or repair needs to be performed. In addition, distortion also reduce dimensional accuracy and even loss of structural integrity. The present investigation aims to reduce welding distortion on A36 steel by controlling heat input during Metal Inert Gas (MIG) welding. The welding process was carried out by maintaining constant voltage and current of 23 Volt and 145 Ampere respectively whereas travel speed was varied in the range of 3.9 to 4.9 mm/s giving heat input of 678 to 936 J/mm. Result of this investigation showed that the welding distortion was achieved at the heat input of 756 J/mm. At this heat input, the percentage of acicular ferrite is maximized resulting in good weld impact toughness.
Pengaruh Variasi Lip Thickness pada Nozzle Terpancung terhadap Karakteristik Api Pembakaran Difusi Concentric Jet Flow Faizal, Elka; Widodo, Agung Sugeng; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.713 KB) | DOI: 10.21776/ub.jrm.2016.007.01.3

Abstract

Nozzle shape greatly influence turbulence between the fuel, air and formation of flow recirculation zone to produce a homogeneous mixing and get a near-perfect combustion. The recirculation zone is area that caused by flow rate breakdown, causing vortex and backflow around the end of nozzle. This backflow that hold up while lowering the flame so the flow rate of fuel and air mixture maintained lower or equal with flame speed. This study used variation of lip thickness of truncated nozzle 0, 4, 8, 12, and 16 mm.To obtain flame stability, fuel velocity and air velocity were variated. Thermocouples were used to measure flame temperature and its distribution. The results showed that stability of concentric jet diffusion flame flow increased with narrow lip thickness on a truncated nozzle. The wider stability area obtained in 4 mm lip thickness. In addition, temperature on diffusion flames concentric jet flow also more evenly distributed evenly with size of the nozzle lip thickness. The highest temperature and temperature distribution in the horizontal direction were occured in in the nozzle with lip thickness of 0 mm. A shadowgrapgh visualization was also used to identify phenomena of the nozzle exit flow.
Analisis Pemodelan Sistem Hibrid Proton Conducting Solid Oxide Fuel Cell (pSOFC) – Turbin Gas Mikro Pada Matlab-Simulink Pranoto, Bayu; Tseng, Chung-Jen; Wardana, ING
Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.39 KB) | DOI: 10.21776/ub.jrm.2016.007.01.5

Abstract

This study simulated Proton Conducting Solid Oxide Fuel Cell (pSOFC) – Micro Gas Turbine (MGT) hybrid system on three different configuration. The first configuration use bypass hot gas from combustor going to fuel heater without  pass the turbine first. The second configuration use bypass hot gas out of turbine going to fuel heater. The third configuration is combined bypass out of combustor and also bypass out of turbine. The performance of these system are analyzed by using variation of operating pressure, fuel utilization (Uf), steam to carbon ratio (S/C), and bypass valve. Moreover, the impact of different bypass position were also evaluated. The result shows that the efficiency of using a double bypass hot gas flow after combustor and turbine is about 67%. This configuration became the best one among of another two configuration which proposed in this research.  The utilization of heat by using a double bypass hot flow gas after turbine and combustor has proven more effective to increase the system efficiency. Means that it can reduce the heat losses of the system.
Pengaruh Rasio Laju Alir Gas Nitrogen-Hydrogen serta Gas Pressure pada RF Plasma Nitriding terhadap Surface Hardness Spesimen SUS304 Oerbandono, Tjuk
Jurnal Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.283 KB) | DOI: 10.21776/ub.jrm.2016.007.01.1

Abstract

RF Plasma nitriding was done on the specimen SUS304. This research had aim to obtain a high surface hardness value as a result of flow rate ratio of Nitrogen-Hydrogen. The experimental research consisted of three models. Each experimental model used varying parameters and constant parameters. Micro Vickers Hardness test was used for testing each specimen of the experimental models. The varying parameters of first experimental model were times of plasma nitriding, ie, 1 hour, 2 hours, 4 hours and 8 hours. The constant parameters were RF-Power Voltage = 250 Volts, DC-Bias Voltage = 500 Volts, N2= 100 (ml/min), H2= 20 (ml/min), Gas pressure (P) = 70 Pa and Heater Temperature (T) = 420oC. The second experimental model contained three varying parameters of nitrogen gas pressure ie, 50 Pa, 60 Pa and 70 Pa. The constant parameters of second experimental model were time of plasma nitriding (t) = 8 Hours, RF-Power Voltage = 250 Volts, Heater Temperature (T) = 420oC, N2 = 140 (ml/min), H2= 20(ml/min). The first and second experimental models had same configuration. The third experimental model used three variations of nitrogen flow rate, ie, 140 (ml/ min), 160 (ml/min), 180 (ml/min). The constant parameters were time of plasma nitriding (t) = 4 hours, RF-Voltage = 250 volts, The Heater temperature (T) = 420oC; H2 = 20 (ml/min), DC-Bias Voltage = 500 Volts, the gas pressure (P) = 60 Pa. The configuration of third experimental model was different with the configurations in first and second experimental models. Surface hardness Values of first experimental model were 379 HV, 348 HV, 474 HV and 387 HV. Surface hardness values of second experimental model were 586 HV, 607HV, 249 HV. Surface hardness values of third experimental model were 313 HV, 574 HV, and 677 HV. from the results were known that nitrogen-hydrogen flow rate ratio into vacuum chamber and gas pressure influenced the surface hardness of SUS304 specimen. The highest surface hardness value of 677 HV was happened at gas pressure of 60 Pa, nitrogen flow rate of 180 (ml/min) and hydrogen flow rate of 20(ml/min).
Optimasi Desain Gasket Karet Tipe Ring Profil C Flange Closed Groove dengan Metode Simulasi Alamsyah, Fikrul Akbar; Choiron, Mochamad Agus; Purnowidodo, Anindito
Jurnal Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (594.635 KB) | DOI: 10.21776/ub.jrm.2016.007.01.6

Abstract

Gasket is one of important part in piping system to prevent leakage, especially in connection between pipes. The purpose of this study was to determine the optimal design on C profile rubber gasket based on contact width considering contact stress. Design parameter in this study were lips thickness (t)= 4; 4,5; 5 mm, lips length (l)= 5; 5,5; 6 mm, outer diameter (Ro)= 6,5; 6,7; 6,9 mm and inner diameter (Ri)= 2,5; 3; 3,5 mm. The observed value is contact width considering contact stress due to flange tightening and its measure by using finite element-based software. Mooney-Rivlin mathematical model used as rubber material model. Based on data from the simulation results, it can be obtained by using Taguchi Method; lips thickness (t) = 4,5 mm, lips length (l) = 6 mm, Outer Radius (Ro) = 6,9 mm and Inner Radius (Ri) = 3,5 mm.

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