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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
Location
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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Pengaruh Fraksi Volume Serat Pelepah Gebang (Corypha Utan Lamarck) Terhadap Sifat Mekanik Pada Komposit Bermatrik Epoksi Johanis Abanat, Jufra Daud; Purnowidodo, Anindito; Irawan, Yudy Surya
Jurnal Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Buri Palm trees (Corypha Utan Lamarck) is one of the many types of flora in Indonesia that has not been used optimally. At the leaf midrib of buri palm has fibers that have not been developed from the engineering side. There for in this study used buri palm leaf midrib fiber as an alternative reinforcement material for manufacturing of epoxy composites that can be useful for manufacturing the body of boat, the interior of boat and also for helmets. Thus, this study aims to determine the tensile strength and impact strength of the material in accordance with the desired application. Before being used the fiber from the buri palm leaf midrib should be tested of the tensile strength and the data obtained at 182,24 MPa. Then also tested Alkali treated fiber NaOH 5% and a maximum tensile strength obtained is 212,29 MPa on the sample by treatment for 2 hours. Base on these preliminary data then manufacturing of composite samples using fibers of alkaline NaOH 5% treatment for 2 hours. Variations of fiber volume fraction are from 0%, 10%, 20%, 30%, 40%, 50%, 60% and 70%. The tensile testing sample based on the ASTM D638-3 standard and impact test samples according to ISO 179-1 standard. From the test results is known that the tensile strength of composites increases with increasing fiber volume fraction up to 70% of fiber that is equal to 51,993 MPa. Impact strength also increased up to 70% fiber volume fraction and the maximum impact strength occured is 6,953 J.Keywords: composite, buri fiber, epoxy, volume fraction
Analisa Defleksi Struktur Tower Transmisi Menggunakan Metode Elemen Hingga Erinofiardi, Hendra
Rekayasa Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Tower is built by arranging space-truss system which can receive axial load in tension or compression. Design a tower must pay attention on loads that will be get, not only its death weight but also loads from surounding, such as wind load, live load and earthquake load. Design a tower must consider those loads to prevent deflection and failure. Based on that needs, this research conduct design a tower 10 m high with assumption of wind load 1000 N by using Finite Element Method. The shape of tower is made in square and triangle. Maximum deflection happened on node 32 in square tower is 0.00114 m, while in triangle shape is only 0.00064 mon node 22.Keywords: tower, wind load, finite element method, deflection.
Distribusi dan Interaksi Tegangan Sisa antar Lubang Setelah Proses Cold Expansion Hole Wahjudi, Ari; Purnowidodo, Anindito; P, Andika H
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

It is well known that the main cause of a failure of structure is initiated by cracks on a member. A crack may originate easily in a region with high stress concentration. Because in the rivet and the bolt joining method are usual with number of holes, and to reduce the stress concentration, the compressive residual stress is introduced in the region near by the hole. The cold expansion hole technique is used to developed compressive residual on the vicinity of the edge hole. The present study was carried out by the computer simulation based on finite element method to investigate the distribution and interaction residual stress in the region between holes related to the cold expansion hole. The result of the study suggests that the distance between holes influence the state of residual stress and its magnitude. These cause by the deformed material between holes interact each other.Keywords: residual stress distribution, stress interaction, region between holes
Optimasi Dimensi Tebal Awal Pelat Pada Proses Pembengkokan Bentuk Jogged Flange Dengan Simulasi Tiga Dimensi Choiron, Moch. Agus; Ariseno, Agustinus; Prasetyo, Andika
Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

One of the problem of bending process is the final product dimension that it is not agree with the expected results. To reduce trial and error of parametersdesign, designers can utilize computer simulations to predict parameter process virtually and more time-saving analysis. The aim of this study is determine the variations effect of initial blank material thickness to the flange flatness of the final product in the jogged flange process.In order to find the influence on the uneveness of the flange bend, the parameters of plate thickness, flange radius ratio, and flange length ratio are selected. Verification models were created to justify the trend data between modeling and the experimental results.From the result, the elevation difference on uneveness of the flange bendwas obtained. For initial blank material thickness dimensions, it can be seen that the minimum value of the uneveness defect can be obtained by using equal of plate area ratio. The observed increase of the flange radius could be attribute to decrease of uneveness of the flange bend. The increase of plate thickness, uneveness of the flange bend will be decrease.Keywords: initial blank material thickness, jogged flange, uneveness of the flange bend
Application Solar Energy for Charging Battery Mobile Phone Elmahdi, Mohamed Abdulhadi; Suparman, Sudjito; Pramono, Sholeh Hadi
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Photovoltaic energy is the conversion of sunlight into electricity. A photovoltaic cell, commonly called a solar cell or PV, is the technology used to convert solar energy directly into electrical power. A battery charger is a device used to put energy into a secondary cell or recharge able battery by forcing an electric current through it. Digital devices, especially mobile phones, need electricity that can be obtained from local electricity station converted into direct current using proprietary charger. Yet, the users can not always find the local electricity station such as in travelling or in condition where electricity becomes unavailable at the moment. On the other side, the use of local electricity to power mobile phones increases the fossil fuel consumption since the main source of energy for our current local. The solar energy is the ideal solution to the problems of energy and the environment and provides environmental safety factor as the solar energy is clean, renewable energy does not pollute the air and leave no waste. The charge controller is divided into two circuits: overcharge controller and discharge controller. Overcharge controller limits the maximum voltage when recharging process is being held. The circuit implemented is an operational amplifier that works as comparator, of which output controls the transistor that will stop or allow the charging current passed to the battery, the result is able to meet the design characteristics for the controller. These results are very useful for charging battery form sun light and it’s more economical and environmentally friendly and the advantage of the system compared to charger mobile phone ac to dc. And this solution for the electrification of remote areas.Keywords: controller, solar panel, battery .
Analisis Kekerasan Pada Pipa Yang Dibengkokan Akibat Pemanasan Sidi, Pranowo; Wahyudi, M. Thoriq
Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Pipe bending process needs special attention because it makes different mechanical properties. Increasing hardness cause materials brittle. The purpose of this study was to analyze the distribution of force on the part of the pipe as a result of the heating curves and 8000C 6700c with bending angle 900 and 1800. SA 335 is a pipe specimen with the size of outside diameter 44.5 mm and a thickness of 8 mm. At first, the two pipes is heated to the temperature 6700c and 2 other pipes that are heated to 8000C temperature, then 2 pipes bended at each heating temperature 900 and 1800. After that cut pipes to grab third in replication in each condition 4 pipe. From the test results found that the bending angle effect on hardness values. The greater the bending angle, the higher the hardness value.Keywords: bending, hardness, pipe, heating.
Reduksi Volume Dan Pengarangan Kotoran Sapi Dengan Metode Pirolisis Wijayanti, Widya; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The study was conducted to determine the change of mass, the shrinking volume and the heating value of char of cow dung induced by slow pyrolysis. The char produced by pyrolysis can be used as an alternative solid fuels. Besides, it can be a biochar as a mixture of biomaterial having a high-value materials. It due to the char has a high content of Carbon. In this experiment, the heating value of char was examined by using bomb calorimeter. The temperature pyrolysis was varied from 100°C to 500°C. Before the pyrolysis process, the feedstock was pulverized to a particle size of about 0.7 mm, and then it dried in the oven to have a moisture content up to 4%. The pyrolisis was conducted at varied temperatures and different heating rates from 0.13°C /sec to 0.29°C /sec.The results showed that the reduction of the cow dung volume performed significantly by the way of slow pyrolysis. The most reduced volume of cow dung occured very significant at the highest pyrolysis temperature, reaching 60% at 500°C. On the other hand, the heating rate variation did not influence in yield reduction, but it has an effect on the result of heating value of char. The results also indicated that the optimal of heating rate occured at 0.13°C/sec to 0.16°C/sec. In the visualization of the solid yield pyrolysis products, as higher pyrolysis temperature, as darker color of the char. It was shown the Carbon content in the char.Keywords: cow dung, pyrolysis temperature, heating rate, heating value, char
Perancangan Alat Pengering Mie Ramah Lingkungan Setyanto, Nasir W.; Himawan, R.; D., Zefry; Arifianto, Endra Y.; M.S., Puteri Rina; N., Kurnia
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Noodle is a food product which is made from wheat, with or without additional ingredients. The products of noodle are generally used as the source of energy because the contents of carbohydrates are relatively high.Drainage is a process to extract or separate the water in the relatively small ammount from the substances using thermal energy. The purposes from this drainage process are: to decrease the water level from the subtances to have longer shelflife, decrease the subtances’ volume to ease and save the transport costs, packaging and storage.The main principple of drainage is extraction of the water from subtances as the result on process of heat transfer which is correlated with the difference of temperature between product’s suface with water’s surface in several location inside the products.Noodle drainage methods can be distinguished as Home Industrial Scale and Big Industrial Scale. Home Industrial Scale can be distinguished as Sun dry and Toaster. Big Industrial Scale can be distinguished as Toaster and Hot Dryer.In this research, noodle drying process are using the tools that can lessen the weaknesses which is owned by the previous tools used, including in big industry. The tool used in this research is using centrifugal force for drainage and blower with the low costs.Materials used in this research have a simple design thatmake it easy to be applied. Moreover the materials used are save for the food processing.Keywords: noodle, drainage, noodle drainage methods.
Rekayasa Software Computer Aided Process Planning Berbasis Metode CBR Untuk Membantu Proses Pembuatan Batik Rahman, Arif; Setyanto, Nasir Widha; Sulistyarini, Dwi Hadi; Arifianto, Endra Yuafanedi; Dewi, Wieke Rossaria; Supangat, Syahrir Aditya
Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

If we make batik manually, it will less effective and efficient.besides that can make worker uncomfortable. Because the new worker must learn all over again to be a reliable process planner as his predecessor. This is loss to the company. Fortunately there is a method called Computer Aided Process Planning (CAPP). CAPP can use to make job more fast than before. Besides that it will make more effective and efficient plan process.Keywords: Batik, CAPP, CBR
Penerapan Overall Equipment Effectiveness (Oee) Dalam Implementasi Total Productive Maintenance (TPM) (Studi Kasus di Pabrik Gula PT. “Y”.) Rahmad, Rahmad; Pratikto, Pratikto; Wahyudi, Slamet
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

In agro-industrial sector especially in sugar factory called PT. “Y”, improvement of manufacturing system is one of an improvement effort that intensively conducted so that later it could responds rapidly to market changes. The company always attempt to improve productivity, one of the way that has been done is implement preventive and corrective maintenance. But in fact, the outcome hasn’t reached the expectation yet. This research found that allocated time to do breakdown maintenance is the main problem, so that most of the corrective action focused in this problem. This research used OEE measurement, Six Big Losses calculation analysis, and also cause-effect diagram to look for existing problem and to give proposed improvement for the problem. As the result, the biggest factors affecting the low effectiveness of machine is reduced speed and breakdown loss so that the proposed improvement action is implementing TPM.Keywords: Preventive Maintenance, Overall Equipment Effectiveness (OEE), Autonomous Maintenance, Total Productive Maintenance (TPM).

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