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Rekayasa Mesin

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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 965 Documents

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Efek Longitudinal Vortex Dihasilkan dari Vortex Generator Jenis Concave Delta dan Rectangular Winglet terhadap Perbaikan Perpindahan Panas: Visualisasi Aliran/Studi Eksperimental Syaiful, Syaiful
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The generation of longitudinal vortex to enhance the rate of heat transfer is a passive method that has been widely considered recently. This consideration is based on improving the energy efficiency and optimum design of a heat exchanger. Therefore, this study is focused on the experimental test and flow visualization of effects of longitudinal vortex generated from concave delta and rectangular winglet vortex generators on the increase of heat transfer rate. This is performed by draining the air inside the channel with variations in velocities ranging from 0.4 m/s - 2 m/s through a rectangular plate mounted with the vortex generators. The attack angle of the flow against the vortex generator is 15Â°. The flow visualization is performed by firing a laser beam on a cylindrical glass rod at certain locations to capture the longitudinal vortex formed on the cross-section plane. Inlet and outlet air temperatures and wall temperature are measured using the thermocouples. The results show that the longitudinal vortices are formed in the wake region of the vortex generators. By using the concave delta winglet, the heat transfer rate can be increased up to 51% and increased to 85% using the concave rectangular winglet.

Pengaruh Campuran Sampah Plastik dengan Katalis Alam terhadap Hasil Produk Pyrolisis Nuryosuwito, Nuryosuwito; Soeparman, Sudjito; Wijayanti, Widya; Sasongko, Mega Nur
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Currently, various methods have been developed to overcome the problems caused by garbage. Pyrolysis is one methode of waste processing which is considered to be prospective enough to be developed. It?s because some advantages such as high conversion ratio and high energy content and potency as an alternative fuel in the future. Therefore, in this paper characteristics of pyrolysis will be studied. The waste materials used are catalyst and plastic waste. The resultant products of the pyrolysis process analyzed by Gas Chromatography / Mass Spectroscopy (GC / MS), while the thermal decomposition analysis was performed using Thermo Gravimetric Analysis (TGA). The results of pyrolysis process in isothermal conditions of a single component and a mixture of plastic waste and natural catalyst show that the final temperature of pyrolysis and the rate of heating affects to the distribution of pyrolysis products for all samples. As pyrolytic temperatures increase, liquid and gas products increase, while solid products tend to decrease. In the temperature range of 300°C, 400°C, 500°C, 600oC pyrolysis temperature with a heating rate of 100°C / min is the ideal temperature for obtaining the pyrolysis product of the liquid fraction and and the maximum gas fraction for all waste types studied.

Pengaruh Mechanical Bonding pada Aluminium dengan Serat Karbon terhadap Kekuatan Tarik Fiber Metal Laminates Firmansyah, Hilmi Iman; Purnowidodo, Anindito; Setyabudi, Sofyan Arief
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Fiber metal laminates (FML) are composite structures fabricated by combining two layers of surface material with the core material. The outer surface of FML used in this composite is Aluminum with Al 1100 type. The FML core material uses carbon fiber. The fabrication process of the composites utilizes vacuum infusion method, in which the resin is infused into the mold with a vacuum condition. Bonds between the core and the surface layers are the variables affecting the strength of FML. In this research, the method used to increase the bonds between layers in FML was a mechanical method, it?s called mechanical bonding. This method involved providing roughness (Ra) on the aluminum surface using sandblasting process to produce different roughness variables, with roughness value of 1,68 ?m; 1,78 ?m; 1,93 ?m; 2,128 ?m and 2,887 ?m. The aim of this study was to examine the effect of aluminum surface roughness to the tensile strength of fiber metal laminates composites. The highest tensile strength of FML was obtained at 2,887 ?m with a value of 367 MPa.

Pengaruh Dimensi terhadap Volume Gas HHO dan Daya Listrik pada Proses Elektrolisis Pradigdo, Dedy; Soeparman, Sudjito; Widodo, Agung Sugeng
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The electrode area have an effect on HHO gas production volume, this phenomena influenced by electric power absorbed from the energy source to the electrode. It is necessary to examine how much the influences on process of the water electrolysis. In this research the effect of the electrode total area on the electrolysis process analyzed to determine the volume of HHO gas and electric power absorbed. The experimental method by testing the extent of several electrodes without the connection and calculating the entire surface on the electrode. The electric power is absorbed among other L1 = 6.413 mm2 : 5,2 ml : 0,774 watt, L2 = 10.028 : 28 mm2 : 7 ml : 0,9030 watt, L3 = 14.328 mm2 : 15 ml : 2,451 watt and L4 = 14.3608 mm2 : 20 ml : 6,192 watt. In this research, the highest result on the electrode having L4: 14.360,8 mm2 = 6,192-watt area. This result influenced by the surface area reacting with water at the anode and cathode of the 12 Volt 70 AH battery and the capacity of the electrolysis generator.

Pengaruh Temperatur Karbonisasi terhadap Mikrostruktur dan Pembentukan Kristal pada Biokarbon Eceng Gondok sebagai Bahan Dasar Absorber Gelombang Elektromagnetik Radar Imammuddin, Azam Muzakhim; Soeparman, Sudjito; Suprapto, Wahyono; Sonief, Achmad As'ad
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Radar Absorbing Materials (RAM) or radar absorbing materials of radar electromagnetic waves are materials used to reduce or eliminate radiation of radar electromagnetic waves in order to avoid reflection of waves. At this time the development of RAM research leads to materials derived from nature. Some materials derived from nature that has been used as RAM such as rice husk, bamboo, coconut shell, coconut husk, wood fiber, and wood flour. In this study, eichornia crassipe is made into biocarbon or activated carbon for use as a base material for RAM. Carbonization is one way to transform water hyacinth into biocarbon or activated carbon. The method used in this research is Experimental Research. The independent variables of this research are carbonization temperature starting from temperature 500oC, 600oC, 700oC, 800oC, 900oC and 1000oC. The results showed that the higher the carbonization temperature, the more open pores will be with 2 Î¼m diameter at 1000oC, and the higher the carbonization temperature than the percentage of carbon crystal formed higher with the value of 14% at temperatures 900oC and 1000oC. The biocarbon structure of eichornia crassipe is crystalline and amorphous making it suitable for use as RAM material.

Studi Numerik Pembakaran Butana (C4H10) dalam Meso Scale Combustor dengan Perforated Plate Baananto, Fauzan; Yuliati, Lilis; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This research was conducted to determine the combustion stability and flame temperature inside meso-scale combustor with variations of perforated plate flame holder and combustion gas temperature at combustor exit side using numerical method or Computational Fluid Dynamics (CFD). Meso-scale combustor is made of two pieces of quartz glass tube with a length of 20 mm and 10 mm. Each quartz glass tube having an internal diameter of 3.5 mm and a wall thickness of 0.7 mm. Two kinds of perforated plate flame holder made of copper i.e. perforated plate type I and perforated plate type II, inserted between two quartz glass tubes. Butane (C4H10) and air were used in this study as fuel and oxidizer, respectively. Numerical simulations were performed using ANSYS Fluent 17.0. The result of numerical simulation showed that the most stable combustion is obtained in meso-scale combustor by using flame holder in the form of perforated plate type II at higher reactant velocity. In addition, the combustor with perforated plate flame holder type II also produces a higher flame temperature at the same reactant speed. These phenomena occured due to the temperature distribution into the reactans is more uniform and the recirculation heats into the reactans is better than the combustor with perforated plate flame holder type I. Flame and combustor walls temperatures increased with increasing recirculation heats.

Unjuk Kerja Turbin Air Kaki Angsa Next-G dengan Variasi Lebar Sudu dan Jumlah Kaki Sudu Menggunakan Pendekatan Komputasional Hidayat, Muhamad Taufiq; Wulandari, Retno
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This study to determine the efficiency of next-G geese foot turbine, the Angled Watermill is utilized in rural or remote areas, with potential rivers and local people to easily adapt the material. It is necessary to design a new turbine that can able to extract energy from free fluid flow or zero headwater power resources. The design and material of the design were done using Computational Fluid Dynamics (CFD) software. The method is to know the most optimal modification of goat water turbine design from the variation in width and number of feet of Next-G geese foot mill legs as follows: (1) 600; (2) 700 mm; (3) 750 mm, for the number of legs used 4 pieces, 6 pieces, 8 legs. The results of development the Next-G goose foot wheel mill blade is the momentÂ pressure value increased for the width of the water wheel blade 750 mm, and the momentÂ pressure decreases to 600 mm. The number of feet 4 blade the pressure moment is increased and decreasing for the number of feet of 8 blade. The optimum momentÂ pressure is applied to the width 750 mm waterwheel blade and the number of 4 impeller feet.

Optimasi Parameter Quenching dan Tempering pada HRP Steel Lokal sebagai Baja Armor Nasional Yurianto, Yurianto; Soenoko, Rudy; Soeprapto, Wahyono
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Armor steel is a high strength and hardness steel that used to protect against damage by an object, individual or vehicle from the direct pressure of projectile. In Indonesia, this steel is made of hot rolled plate steel and heat treated by quench and temper, the result is Quenched & Tempered Steels used for military components (such as main battle tank and the like) and commercials (such as making heavy equipment and others) manufactures. The problems of this study can be formulated by â€œWhat are the optimum hardness number and toughness that can be achieved by HRP Steel made in Indonesia?â€. This study aims to find the optimum parameter of quenching and tempering heat treatment to the hardness and toughness of HRP Steel made in Indonesia. The method of this study to combining quench and temper heat treatment by optimizing austenitization temperature; holding time of austenitization; tempering temperature; holding time of tempering. Optimization is done by using Minitab 16 Software. The result of the study is austenitization temperature 900 oC; holding time of austenitization 45 minutes; tempering temperature 125 oC; holding time of tempering 45 minutes; hardness prediction 569,96 HVN (and hardness influenced by tempering). For austenitization temperature 900 oC; holding time of austenitization 45 minutes; tempering temperature 175 oC; holding time of tempering 45 minutes; prediction of toughness 30.50 J (and toughness influenced by tempering).

Rekayasa Sistem Informasi Manajemen Perawatan Mesin Perkakas di Laboratorium Proses Manufaktur Jurusan Teknik Mesin Universitas Brawijaya Rusdin, Rusdin; Santoso, Purnomo Budi; Darmadi, Djarot Bangun
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Manufacturing Process Laboratory of Mechanical Engineering of University Brawijaya still applies the manual system in carrying out preventive maintenance. This has caused delays of action for machine maintenance and difficulties encountered by the manager or head of the laboratory with accessing to data on preventive maintenance matters to obtain the required information. Besides, there has been no encoding on the machines, components, and spare parts so that the search for information on the machines and spare parts took a long time. Therefore, a Maintenance Management Information System, which integrates Database science, Preventive maintenance, and machine tools, was created where the steps included developing the prototype. The instrument used in creating the information system was Microsoft Access 2016. Based on the testing results, the Maintenance Management Information System could generate report recaps, daily reports, warnings of available spare parts stocks, and tools and search menu. Accordingly, the information system could meaningfully assist the head of the laboratory in managing the maintenance of machines.

Analisa Perpindahan Panas dan Pressure Drop Fluida Nano Al2O3-Air Proses Pendinginan dengan Metode Simulasi Marali, Aryati Muhaymin; Wahyudi, Slamet; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Conventional heat transfer system is unable to absorb heat well. Various methods have been done to enhance heat transfer. One of them is the methodÂ by using nanofluid which has been done by many researchers; due to the better thermal performances compared to base fluid. The research aims to observe the enhancement of convective heat transfer and pressure drop in the cooling process by using Al2O3 â€“ Water nanofluid. The volume concentration of the Al2O3 varied from 0.2% and 0.3% with 30 nm diameter nanoparticles flowing in a double pipe with the opposite direction. The result showed that the increase of the particle volume concentration leads to enhance convective heat transfer coefficient and pressure drop. The two variables of measurement showed the average heat transfer coefficient increased about 21% with 0.2% and 0.3% volume concentration compared to base fluid. Pressure drop increased about 22.86% with 0.2% and 0.3% volume concentration. In conclusion, the performance of nanofluid slightly increased together with the increase of volume nanofluid concentration.

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Jawa timur

INDONESIA