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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 10 Documents
 1 
Search results for , issue "Vol 2, No 1 (2011)" : 10 Documents clear
Perilaku Impak Dan Porositas Paduan Al-Si-Mg Pada Pengecoran Sentrifugal Akibat Temperatur Pemanasan Awal Cetakan Setyarini, Putu Hadi
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Aluminum is widely used as raw materials in engineering because this material is often used to replace other metals with the same function. This occurs when the product must have properties such as light, good heat conductivity, and low melting point. An example of making Aluminium product is centrifugal casting process. Centrifugal casting is a method of casting metal by pouring metal into a mold that rotates with a certain speed. This study aims to determine the effect of preheating temperature of the mold of on impact strength and porosity of aluminum alloy Al-Si-Mg in centrifugal casting. The experiments were carried out with and without mold pre-heating. The temperature of preheated mold were 100 º C, 200 º C, 300 º C, 400 º C. The data obtained were analyzed statistically and theoretically. The results showed that the increasing of the preheating temperature of the mold significantly affects the value of impact strength of aluminum alloy Al-Si-Mg. The highest value of impact strength and the lowest porosity were obtained in the preheating temperature of 400 º C. This is due to reduced temperature gradient between the temperature of molten metal and the mold temperature resulting in a slower cooling rate in a homogeneous suspension.Keywords : centrifugal casting, preheating the mold, aluminum alloy Al-Si-Mg, impact strength, porosity
Desain Dan Uji Prototipe Alat Pasteurisasi Susu Berbasis Teknologi Irradiasi Ultraviolet (Kajian Dosis Uv) Lastriyanto, Anang; Kuncahyo, Erry Dwi; Komar, Nur
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The process of milk pasteurization generally use thermal method. The method can cause microorganisms inactive on the other side, the method result in the degradation of quality food. An alternative method that can be used is by using technology of ultraviolet irradiation. Ultraviolet light has short wavelength with a very strong antimicrobacterialenergy.The mechanism of its wor is by absorbing the energy by nucleid acid without causing damaged on the surface of cel. The absorbed energy will cause the bonding of tymine (dimer tymine) so that the function of nucleic acid is disturbed and it cause the dead of microorganism (Lay and of Hastowo, 1992). The devices used in this research are ultraviolet lamp type C, spiral hose, supporting frame, materials containers and the devices for measuring the amount of microbes, fat, specific gravity and colour. Materials used in this research is fresh milk that obtained from KUD DAU Malang. The result are pasteurization process with UV irradiation decrease microorganisms and fat in milk.Keywords : Pasteurization, ultraviolet irradiation, milk.
Optimasi Kualitas Hasil Pengelasan Gas Metal Arc Welding (GMAW) Baja ASTM 283 Grade A dengan RSM (Response Sufrace Methodology) Gapsari, Femiana; Sulistyorini, Dwi Hadi
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research aimed at the investigation of the effect of welding current, welding voltage, and welding speed on the hardness of weldment. The material used in this research is steel ASTM 283 grade A. An optimization approach is performed in order to determine the variables combination of the welding current, voltage, welding and welding speed to maintain the weldment to be below hardness and was closer with parent metal hardness. With application Response Surface Methodology(RSM) mathematical relationship between the welding process input parameters and output variable like hardness of welded joint in order to determine the welding input parameters that lead to desired weld hardness. RSM design of experiment techniques can be very efficiently used in the optimization of welding parameters in GMAW process. Formulation of equation is done with the help of which hardness can be predicted as Y = 218.624 +10.31 I+1.614V-4.017s-1.723 I2+0.929 s2.Keywords : Optimization, Response Surface Methodology (RSM), Hardnes, GMAW.
Analisa Kegagalan pada Spindle Mesin Batch Centrifugal Purnowidodo, Anindito; Wahjudi, Ari; Prawira, Riza
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Failure analysis was conducted on the failure shaft of batch centrifugal. In the analysis the stress analysis was used to know the stress distribution, and in conjuction with stress analysis the life time of the component can be estimated. In addition, the fractography anlaysis together with mechanical properties test were carried out to understand the mechanism of the failure. With respect to the result of analysis shows that the failure was caused by fatigue crack initated on the surface of shaft due to the inhomogeneus mechanical properties, in this case, the hardness is lower than that on sub surface of the shaft. Besides that, the stress concentration was found take place on the surface of shaft on which the crack was initated. Further, it was known that during machining process, the material of shaft was heated on elevated temperature on the surface to ease the process. The heating reduced the hardness as well as the strength of the material.Keywords : Failure, Fatigue, Crack.
Rancang Bangun Alat Pengontrol Suhu pada Proses Pengomposan Sampah Berbasis Mikrokontroler Atmega8 Nugroho, Wahyuananto Agung; Prasetyo, Joko; Luthfi, Musthofa
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Compost is organic materials like leaves, straws, reeds, grasses, and even the animal faces which have experienced decomposition process by micro organism so can be used to repair the nature of soils. The aims of this research are (1) Designing Temperature Controller system by using LM35 temperature Censor with Atmega8 microcontroller, (2) Designing and constructing software using C language program to control temperature automatically, (3) Testing temperature controller device at composting machine. Research parameters include censor calibrating, microcontroller testing, and whole device testing. The research conduction got the result for temperature sensor 1, 2, 3, and 4 used LM35 censor at range 25oC – 70oC. Linear regression for censor 1: y = 0.098x + 2.059 determination coefficient score is 0,996. Linear regression for censor 2: y = 0.101x + 0.876 determination coefficient score is 0,995 Linear regression for censor 3 and 4: y = 0.098x + 2.059 with determination coefficient = 0,996. From the whole device testing, first step intake of temperature data, 30 minutes interval for 3 days: deviation score 1st day = 0.98, 2nd day = 0.906, and 3rd day = 0.937. Controlled temperature composting needs less time and produce less stink than composting without temperature control.Keywords : composting, controlling, microcontroller, temperature.
Analisis Energy Produksi Biodiesel dengan Metode Metanol Super Kritis Argo, Bambang Dwi; Gunarko, Gunarko
Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Supercritical methanol process has several advantages, that is not influenced by the material conditions for the free fatty acids contained in the materials will be esterified into methyl esters directly, the conversion rate of oil into methyl ester of tall, shorter process time and not influenced by the presence of water. However, this method has a weakness that is the need safety treatment because the process involves high temperatures and pressures. Super critical methanol method has a 2-stage hydrolysis process which took place on the state of the sub critical water to separate the free fatty acid (FFA) and glycerol, methanolyisis place on super critical conditions of methanol with the aim of changing the FFA to biodiesel, both processes take place at a temperature of 270 ° C and pressure of 70-20 MPa.. From the research of biodiesel production process using supercritical methanol without catalyst, the reaction time is faster total reaction time of 9250 seconds (2.57 hours), with the result of more production (400 ml biodiesel) from the raw material 5% water (35 ml ), cooking oil 95% (665 ml), and 95% wt methanol (200 ml), has a 52.39% energy efficiency.Keywords : Biodiesel, methanol super critical, energy.
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
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.
Analisis Tegangan Akibat Pembebanan Statis pada Desain Carbody Tec Railbus dengan Metode Elemen Hingga Sutikno, Endi
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Railbus is one type of vehicle operated for a short distance. Although that operated on the rail, construction rail bus more likely to match construction with small size busses and passengers abit becouse the porpuse of use that speed is faster than regular train, railbus which has several different design of the produc of the PT KIA previusly requere the precence of the force to be know sequrity testing products to be produced, railbus should be able to accept the burden of both passenger as well as from its own weight, including load time of the coupling between the carriages.Research conducted at carbody TeC railbus in the three different loading cases, namely case 1, which stimulated loading occuring at the time railbus carbody TeC is in the push condition, case 2 represents the state loading on the carbody TeC railbus during compression on the other locomotive on the coupling process railbus done to connect with other locomotives, and case 3 which represents the state loading carbody TeC railbus when withdrawal of the oher locomotives when railbus not operated of a simulation, and the known distribution of the stress that occurs in TeC railbus carbody construction design on static loading distribution and the result of the stress that occurs in all three cases, ie the largest stress value in the first case occured in an area with a stress value frontpart 157,883Mpa, in the second case occured in an area frontpart with a stress value of 193,033Mpa, and the thirdcase, a stress of 140,615Mpa occurs in area crossbeam of the underframe. The third stress occurs in all three cases remained at the limit of material strength, so it can inferred TeC railbus carbody construction design is consider capable receiving a load that will be accepted railbus during operation.Keywords : Stress Analysis, Railbus, Finite Elemen Method

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