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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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Peningkatan Kualitas Bahan Bakar Biogas Melalui Proses Pemurnian Dengan Zeolit Alam Hamidi, Nurkholis; Gede Wardana, I Nyoman; Widhiyanuriyawan, Denny
Jurnal Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Biogas from digester consists primarily of methan (CH4) and carbondioxyde (CO2). Trace components that are often present in biogas are water vapor (H2O) , hydrogen sulfide (H2S),hydrocarbons (HC), ammonia (NH3, oxygen (O2), carbon monoxide (CO) and nitrogen (N2). In order to improve the quality of biogas, a cleaning process to remove the trace components and an upgrading process to adjust the calorific value are needed. A number of techniques have been developed to remove the trace components from biogas. In this experiment, however, chemical absorption of CO2 and H2S by solid zeolite in a plastic bag was experimentally investigated. The solid zeolite was activated by heat treatment and KOH. Absorption characteristics were examined. Test results revealed that the solid zeolite used were effective in adsorbed CO2 and H2S in biogas, creating CH4 enriched fuel. Absorption capability was transient in nature. With regular replacement or regeneration of used solid zeolite, upgraded biogas can be maintained. This technique proved to be promising in upgrading biogasquality.Keywords: KOH compound, calorific value of biogas, zeolite.
Komposit Hibrid Polyester Berpenguat Serbuk Batang dan Serat Sabut Kelapa Lumintang, Romels C. A.; Soenoko, Rudy; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sawdust coconut trunks of palm trees and fiber coconut coir are two waste materials from the processing of coconuts and coconut tree trunks sawmill waste are plentiful materials can be utilized for producing composites using polyester resins. Both each properties materials as follow polyester resin: liquid in the open air conditions, sawdust coconut and coconut coir fiber properties is lightweight and fragile nature of the polyester adhesive used as a binder (binder) between fiber coconut coir and sawdust coconut palm tree trunks as a filler. The variation volume fraction between the sawdust and coconut trunks of fiber coconut coir in polyester resin influence mechanical properties for each composition of this composite. By comparizing the volume fraction of either polyester, sawdust coconut palm tree trunks and fiber coconut coir (Coir coconut) using tensile test standard ASTM D638-I, and the ASTM D6110 for impact testing. The result of tensile and impact test, obtained that the optimum percentage 30:10 per cent, mean tensile strength on 95.953 N/mm2 , mean elasticity 0,125 % , mean elasticity modulus 768.702 N/mm2, mean absorbed energy 2,679 J and mean impact value 0,068 J/mm2. Keywords: Polyester, Sawdust coconut, coconut coir fiber, mechanical properties
Pengaruh Temperatur Pelat Landasan Selama Proses Friction Stir Welding Terhadap Kekuatan Tarik Sambungan Las Lembaran HDPE Setiawan, Agus; Irawan, Yudy Surya; Purnowidodo, Anindito
Jurnal Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The purpose of this study was to determine the weld ability of HDPE sheets (High Density Polyethylene) through the method of welding FSW (Friction Stir Welding). FSW is a new welding process, where joined of the material occurs in the solid state. Samples were welded with vertical milling CNC machines, while the type of connection is a butt joint. This study used three process parameters, two parameters are combined and one parameter value is constant, the parameters combined are temperature backing plate (30; 70; 110 and 150 oC) and the welding tool rotation speed (2200; 2300 and 2400 rpm), while the parameters with constant value is the welding speed (30 mm / min). In this research experiment conducted observations and analysis of surface textures welded joints, weld surface temperature during the process in front of and behind the welding tools, macro-structure of the welded joints, the maximum tensile strength and fracture tensile test results. From the results of this study was obtained that temperature backing plate during FSW process affects the maximum tensile strength and homogeneity of HDPE sheets welded joints. The maximum tensile strength of welded joints higher is 28.52 MPa or 95.07% of the maximum tensile strength of HDPE material, the maximum ultimate tensile strength values were obtained on the condition temperature backing plate t = 150 oC and the welding tool rotation speed n = 2300 rpm. Heating the material HDPEby backing plate during FSW process insulator properties of the material that is an obstacle inthe process of forming a perfect weld can be resolved.Keyword: temperatur backing plate, friction stir welding, the tensile strength of welded joints,HDPE sheets.
Study on Pressure Distribution in the Blade Passage of the Francis Turbine Sutikno, Djoko; Soenoko, Rudy; Pratikto, Pratikto; PT, Fery Putra; Nur Cahyo, Ponco Muchamad
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Pressure distribution along a series of guide and runner blade passages of the Francis turbine are useful to be known in order to predict flowing water pressure through the passages whether the pressure under the vapor pressure or not. Furthermore, when at any section of the passages the water pressure under the vapor pressure a cavitations will occur. In this study, the pressure of flowing water throughout the blade passages were measured at four sections along the passages by using four mercury deflection manometers and conditions of the flowing water were recorded by using a stroboscope and camera. The turbine was operated at 5 different heads with the same guide blade openings. Water pressures at the inlet and outlet turbine were measured by a Bourdon manometer of each. The flow rates were measured by using an orifice plate equipped with a mercury deep well manometer. The forces were measured by using a prony brake and turbine rotations were detected by using a digital tachometer. The result of the research state that head drop on the guide and runner blades, and turbine efficiency changing as the head, flow rate and turbine speed changed. The head drop on the runner was greater than that on the guide blade. Cavitations were not occoured because the lower pressure along the passages were still higher than vapor pressure. Water pressure decreased from the guide blade inlet to the runner outlet. Keywords : Francis turbine, Pressure distribution, guide and runner passages, head drop, cavitations, efficiency.
Pengaruh Variasi Sudut Static Mixer Terhadap Kinerja Heat Exchanger Widhiyanuriyawan, Denny; Purnami, Purnami; Ardiansyah, Ardiansyah
Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This study was proposed to determine the effect of static mixer on innertube installation of double pipe heat exchanger. The dimenssion of outer (hot fluid) and inner (cold fluid) pipes of heat exchanger were 76.2 mm and 25.4 mm, respectively. Static mixers with 19 mm diameter and 60 pieces number were variated with θ=40o, 80o, and120o. The hot fluid discharges were variated from 400 to 900 liters/hour and the constant of cold fluid discharge with 900 liters/hour. The results show the heat transfer rate of statics mixer with angle variation higher than plain tube (without static mixer).The heat transfer increased 24%, 39%, and 44% for variation angel of static mixer with θ=40o, 80o, and 120o, respectivelly.Keywords: Static mixer, heat transfer rate
The Energy Flux Different Stability Estimation Of Hydraulic Flow in a Horizontal Pipeline With Longitudinal Grooves Number Variation Hadi, Abdul; Wardana, ING; Sutikno, Djoko
Jurnal Rekayasa Mesin Vol 2, No 2 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The experimentally research was governed to estimate the external (source) and internal signal combined system without separate each other. Referring to that, the Lumped Parameter System (LPS) analytical modeling method by Matko et al (2001) as looked as possible is significance and accurately to estimate the internal pressure or difference pressure fluctuation of fluid lines. By using the LPS method were known that the horizontal fluid lines dynamic system with longitudinal grooves number variation (in fractal geometry image) for which will be used as an object in this research are fulfilled as a low frequency model class and small gain pressure fluctuation for every measurement acquisition result It’s properly in the LPS modeling method, the hydraulic fluid lines should be looked as a compressible fluid and over pass storage of energy charging so the response is not only affected by resistance but also by inductanc e and capacitance of the fluid. The three fluid elements respectively for a pipeline length unit are constant, have positive values eventually and modified as a function of the pipeline hydraulic diameter. It’s confirmed that the result could be given to predict the locally linearly stability character of the fluid flow energy flux different between upstream and downstream pipeline positions.Keyword: Energy flux different stability, hydraulic flow, horizontal pipeline, Longitudina grooves number variation, Lumped parameter system analytical modeling
Pengaruh Kadar Karbondioksida (CO2) dan Nitrogen (N2) Pada Karakteristik Pembakaran Gas Metana Wahyudi, Djoko; Wardana, ING; Hamidi, Nurkholis
Rekayasa Mesin Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

One of the renewable energy is biogas. Biogas has a great chance in its development. Biogas resulted from fermentation process is consists of: CH4 (55-75%), CO2 (25-45%), H2 (1- 5%), N2 (0-0.3%), O2 (0.1-0.5%), and H2S (0-3%). If biogas is cleared from polluter well it will have the same characteristics with natural gas. Components of the polluter water (H2O), hydrogen and as sulfide (H2S), carbon dioxide (CO2) and some particulates should be eliminated to achieve pipeline quality gas. In order to understand how the influence of the levels of CO2 and N2 of the methane combustion characteristic. The observation was conducted experimentally by burning a mixture of stoichiometry (methane gas and air) with a percentage of CO2 and N2 in the transparent fuel square-shaped space with dimensions 500 x 200 x 10 mm. The results showed that the levels of CO2 and N2 affect the combustion process, it causing the blue flame to be fade.It indicated the combustion is not perfect and the levels of CO2 and N2 inhibits the collision reaction between molecules of methane gas and air molecules. The result also showed that CO2 reduce the flame speed. Keywords: energy, CO2, N2, combustion characteristic, methane gas, air
Karakteristik Pembakaran CH4 Dengan Penambahan Co2 Pada Model Helle- Shaw Cell Pada Penyalaan Bawah Uwar, Nur Aini; Wardana, ING; Widhiyanuriyawan, Denny
Jurnal Rekayasa Mesin Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Along with the development of industrial technologies is rapidly increasing the demand for renewable energy sources becomes a very important consideration. One of the alternative energy is now being developed is the energy derived from organic materials, this is because the organic compounds are classified as renewable energy. One energy technology in accordance with the requirements of the biogas technology. If biogas is purified or cleaned of impurities in this case CO2 is good, he would have the same characteristics as natural gas. How big is the influence of CO2 on heating value (heat) in the combustion process it is necessary to an investigation. one by looking at the characteristics of combustion, both the pattern and pace of rambatnya. Combustor used in this study is a model of Helle-shaw cell measuring 50 x 20 x 1 cm. Variation of the mixture used is the ratio 7,5:1 to 10: 1 with the addition of 10% 20%, 30% CO2. Performed on the ignition of ignition. Observation of the shape and rate of flame propagation is done using a high speed camera. The results showed that the ratio of 7,5:1 to 10: 1 blue color of the flame and the flame propagation speed greater penembahan but with 10% CO2 20%, 30% color changing flame reddish yellow which indicates incomplete combustion occurs, and the smaller the rate of flame propagation. This is influenced by the presence of buoyancy forces generated by the combustion.Keywords: energy, gas methane (CH4), CO2, the rate of propagation of flame
Analisis Pengaruh Servqual Terhadap Kepuasan Serta Loyalitas Mahasiswa (Studi Kasus Pada Jurusan Teknik Mesin Di Universitas “XYZ”) Maulana, Yassyir; Astuti, Murti; Surachman, Surachman
Jurnal Rekayasa Mesin Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In the future right now, thight competition not only happens to the economic sector, but have been venturing into the education sector. Improve quality is one of the business strategies that are used to improve customer satisfaction. Customer satisfaction will be achieved if the quality of product or service to be fulfilled suit their needs. But giving satisfaction to customers is not enough and even requisite is customer loyalty. Customer loyalty in the world of education closely related to loyalty student. Loyalty student are necessary for survival and existence of a college. Student who have high loyalty is an asset to college because give positive recommendation and encourage friends, brother and other civil society to use education service that have been perceived and experienced firsthand. This research aims to analyze the influence of the SERVQUAL variables consisting of Tangible, Reliability, Responsiveness, Assurance and Empathy with variable SATISFACTION and variable LOYALTY at the engineering university “XYZ”. This research was conducted by the method of survey, the data obtained through the distribution of questionnaires to 125 respondent, but respond only about 112 student. Method of sampling using Random Sampling. Data analyzed by the method of Structural Equation Modeling (SEM) using LISREL 8.80 program with Maximum Likelihood estimation. The result of this research can be concluded there was no correlation between variable SERVQUAL with variable LOYALTY, while there is a relationship between variable SERVQUAL with variabel SATISFACTION, then there is a relationship between variable SATISFACTION with variable LOYALTY. it can be concluced that, if the quality of service improved then student will be satisfied and expected with that satisfaction can create loyalty which is positive word of mouth.Keywords: SERVQUAL, Student Satisfaction, Student Loyalty.
The Fluidity Characteristics of Liquid Duralumin by Piece Test Methode on Permanent Mold in Low Pressure Suprapto, Wahyono
Rekayasa Mesin Vol 3, No 1 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The shrinkage and porosity is the casting failures which is often found in the casting products especially aluminum alloys. That failure is happen because the liquid metals cooling processes is not uniform or there is pit-fall gasses. The shrinkage and porosity significationcould reduce material mechanics characteristic significantly. The controlling parameters of the vibration the metals solidifications is implicated to the improvement of aluminum alloys casting products qualities.The objective of this experiment research is to compare the properties on castability, formability, and sub-surface defect on a piece duralumin cast of permanent mold casting. Low pressure mold cavity is an independent variable and fluidity, ductility, porosity are dependent variables, and pouring temperature is a control parameter which is plant in this research design. The research conclusion is while the pressure decrease on cavity would increase castability, ductility, and could reduced the sub-surface defect on duralumin casting.Keywords: fluidity, liquid duralumin, low pressure, solidification, sub-surface defect

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