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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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Kota malang,
Jawa timur
INDONESIA
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 949 Documents
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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.
Pengaruh Fraksi Volume Terhadap Kekuatan Tarik dan Lentur Komposit Resin Berpenguat Serbuk Kayu Gapsari, Femiana; Setyarini, Putu Hadi
Jurnal Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

On the research, composite was made from polyester with volume of filler fraction variable of 15%, 30%, 45% and the type of filler was Mahogany (Swietania mahogani). The filler measurement used was 50 mesh. Polymer matrix used was BQTN 157 unsaturated resin polyester. The tensile test of experiment specimen was based on ASTM D638 M-93. and the bending specimen was based on D790-92 Standard. The higest of tensile strength on the volume fraction of 30% that is of 2.081916 kg/mm2 . For the composite material with particle of composite material mahogany with filler volume fraction of 15% had the average flexural strength of 34.98 N/mm². On the particle with volume fraction of 30% had the highest average flexural strength of 45.6780 N/mm². The higest Modulus of Elasticity(E) and Shear Modulus (G) was owned by the composite with filler volume of 635.464 kg/mm2 dan 958.85 MPa Keywords : Composite, volume fraction, tensile strength, flexural strength
Sistem Monitoring Gas Oksigen dan Karbondioksida pada Ruang Penyimpanan Sistem Udara Terkontrol Argo, Bambang Dwi; Lastriyanto, Anang; Astuti, Nuraini Puji
Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

One of way in pickling process of main food material of vegetable and fruits is storage. In principle metabolism storage, like respiration, transpiration, infection plant diseases and lengthen more durable. Purpose of storage of fruit and vegetable to lengthen product usefulness, controls request of market and increases advantage. At research before all, the system controlled atmosphere storage still be done in manual either from within observation of composition and operation of gas in it. Therefore, need to be done modification of equipment with addition of monitoring system and gas control automatically, so that change of gas volumein storage space of CAS can be detected. Equipment applied in this research is microcontroller AT89S51 and its arrangement system by using computer. With existence of communications between microcontroller system with personal computer through IC RS 232. At this researc happened change of oxygen gas concentration from 21% to 2% and increase of percentage of carbondioxide from 0.03% to 2.5% for temperature 26oC. this matter is according to boundariset wanted for condition of apple atmosphere Rome Beauty.Keywords : Oxygen, carbondioxide, CAS, MKAT89S51, Personal Computer (PC)
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.
Modifikasi Mesin Pembangkit Uap untuk Sumber Energi Pengukusan dan Pengeringan Produk Pangan Pudjiono, Ekoyanto; Djojowasito, Gunowo; Ismail, Ismail
Jurnal Rekayasa Mesin Vol 1, No 3 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

One company has a cracker in Landungsari Malang open steam generating machine. Some weaknesses in the machine such that the resulting low temperature, long heating time and fuel consumption of a large or wasteful of fuel. This experiment was conducted to improve the efficient use of steam heat, namely by modifying the power plant steam into a closed system, with the hope eventually can be used not only as an energy source steaming but also to the source of energy in drying crackers. Modify and test the performance of steam powerplant, to evaluate energy efficiency, conducted at the Laboratory of Resources and Agricultural Machinery, Agricultural Engineering Department, Faculty of Agricultural Technology, Malang UB. Tests conducted with the treatment of water volume 55 liters (V1) and 69 liters (V2) andtreatment pressure of 1 atm (P1) and 2 atm (P2).Keywords : steam power plant, energy efficiency
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.
Uji Performansi Pencuci Biodiesel Metode Pengkabutan Air Dalam Minyak Argo, Bambang Dwi; Djoyowasito, Gunomo; Yulianingsih, Rini
Rekayasa Mesin Vol 1, No 2 (2010)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Washing of biodiesel removes contaminants (soap, catalyst, methanol and free glycerin) from biodiesel, even though this activity will sometimes cause an emulsion. This research aims to develop new method of washing that can minimize emulsification. The method used is misting water in crude biodiesel by certain nozzle. Washing apparatus has 5 main part i.e. nozzle, washing chamber, circulation pump, valve to set level of debit and piping channel. The research has been done to study dependency of biodiesel washing on the numbers of nozzles (2, 3 and 4) , the distance between nozzle and constrictor plate (2 cm, 4 cm, 6 cm and 8 cm) and the level of wash water debit 45.3 ml/min,83.6 ml/min and 150 ml/min . Parameters measured were pH of wash water, emulsion formed, rendemen of biodiesel, quality of biodiesel and energy consumption. Variation of the numbers of nozzles are purposed to have more extensively contact between water and biodiesel. At optimum level of debit, high performance biodiesel washing expeted, with little emulsion can be obtained. The research indicates that the numbers of nozzles, the distance of nozzle and level of water debit are significant variables to determine washing performance. The research showed that washing biodiesel with the numbers of nozzles 4 pc, debit of washing water 83.6 ml/min and 45.3ml/min and distance between nozzle and constrictor plate 8 cm produce 100 % biodiesel for every step washing, with pH of washing water at third washing 7.1 and emulsion formed 81.6 ml . Misting water in oil method needs smaller energy than others, i.e. only 4% of stirrer method and 1.2% of bubble method. Quality biodiesel – i.e. density, flash point, cetane index, cloud point, moisture content, viscosity – meets ISO standard. Keywords : Biodiesel, Washing, Emulsification, Energy
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.

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