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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.

Arjuna Subject : -

Articles 965 Documents

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Perancangan Sistem Pengaturan Suhu pada Mesin Sangrai Kopi Berbasis Logika Fuzzy Utomo, Satryo Budi; Agung, Moh.; Sumardi, Sumardi
Jurnal Rekayasa Mesin Vol 6, No 2 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

One of commodity in Bondowoso district is a coffee. There are two coffee flavor i.e. arabica and robusta. The quality of coffee is depending on the roasting temperature of coffee. At constant temperature, it require long roasting time around 1,5 to 2 hours. Because of that, automatically temperature control system was needed to control the roasting temperature to make the roasting time faster and more efficient by using fuzzy logic method. Sugeno method was used in this study by inputing error temperature and âˆ† error temperature. The results show that temperature censor has 1.95% error against actual temperature of termometer. The fuzzy logic controls the actuator movement to regulate the valve of LPG that is fuel of furnace roaster. By using fuzzy logic, roasting time of arabica coffee and robusta coffee are 36,9 minutes and 30,216 minutes, respectively.

Pengaruh Penempatan Penghalang Berbentuk Segitiga di Depan Silinder dengan Variasi Kecepatan Aliran Udara terhadap Koefisien Drag Tista, Si Putu Gede Gunawan; Suriadi, I Gusti Agung Kade; Astawa, Putu Pageh
Rekayasa Mesin Vol 6, No 3 (2015)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

One of the ways to preserve energy on the air plane is by decreasing the drag. Drag is closely related to the flow separation, the faster the separation, then the drag will increase more. Because of that, efforts were conducted to decrease drag is by manipulating a fluid flow field that is by installing triangle rod obstacle in front of the cylinder. The purpose of this research is to analyze the effect of installing triangle rod obstacle in front of the cylinder by various air flow velocity on the drag cofficient. In this research, the experiment was conducted in the wind tunnel, which consists of blower, pitot pipe, manometer, cylinder pipe, and triangle rod. The air flow velocity was varied from 6.25 m/s, 5.01 m/s, 4.09 m/s, 3.17 m/s, 2.24 m/s .The Reynold number based on cylinder (D = 42 mm) and air flow velocity is Re =18.100, 14.500, 11.800, 9.170, 6.480 .The distance triangle rod and cylinder is L = 70 mm or L/D=1.67.Pressure distribution is achieved by measuring the cylinder surface on 36 spots with interval of 100. The measured data was pressure of cylinder surface, static pressure, and airflow speed. The research results showed that the triangle rod could decrease the drag of cylinder. Coefficient drag for cylinder without triangle rod was 0,1276 while the less triangle rod was 0,01882 which takes place at speed 6,2479 m/s.

Karakteristik Pembakaran Biobriket Kulit dan Cangkang Karet (Hevea Brasiliensis) dengan Perekat Glyserin Mariki, I Wayan Wawan; Wahyudi, Slamet; Widhiyanuriyawan, Denny
Rekayasa Mesin Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Some studies have been done on utilizing biomass from agriculture such as the leather and shell of rubber (Hevea brasiliensis) were not used optimally in Indonesia as an alternative energy which developed by making biobriquet to achieved the higher energy that could be used in the combustion process. In this study, the biobriquet was made of the leather and the shell of rubber by comparisson of the leather and shell were: 0%: 91%; 45.5%: 45.5%; 55%: 36%; 64%: 27%; 91%: 0%.Glyserin 9% for each percentage of biobriquet was used as adhesive material and the drying temperature of 110 C. This study aims to investigate the characteristics of biobriquet combustion which made of the leather and shell of rubber. The results shows that the biobriquet combustion process which made of 64% rubber leather and 27% rubber shell has a calorific value of 5313,923 Kal/gr. In 20 seconds of initial ignition, the combustion process shows the improvement such as increased concentrations of the flammable leather, bluish red fire.

Studi Kinerja Solar Water Heater Dengan Aliran Zig-zag Beralur Balok Ikhsan, M. Rizki; Soeparman, Sudjito; Sasongko, Mega Nur
Jurnal Rekayasa Mesin Vol 8, No 1 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Solar energy can be used for water heating by using solar water heater application. Therefore, its still needs some modification due to its low efficiency. This modification can be done by replacing the conventional plate of solar collectors into a double plate with a zig-zag pattern. The results shown that along with the decreasing of water flow rates could significantly increase the useful energy (Qu). Initial temperature of water inlet could affect the generated maximum temperature. The highest mean efficiencies of double plate solar water heater with a zig-zag grooved beams pattern of 49.11% was gained in the flow rate of 700 mL / min.

Pengaruh Rasio Step pada Sudden Enlargement Channel terhadap Heat Flux Kondensasi di Porous Media Praswanto, Djoko Hari; Siswanto, Eko; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

One of the most significant parameter in air conditioning problems is air humidity. A porous media can be used as a heat exchanger component in order to increase the heat transfer performance which is significantly depends on the heat flux values inside of them. To determine the heat flux value, a following test section was modeled in this research. A vapor passed through a channel whereas a particular porous media made of active carbon acted as its heat exchanger media. However, the sudden enlargement at the inlet of channel could affect the homogeneity of temperature distributions and also caused some several turbulencies. The research method is vapor flowed over the porous media for 60 minute with temperature of 300oC.The vapor velocity is varied from 1 m/s to 3 m/s and the step ratio also varied between 0 until 1.66. From the experiment shows the bigger step ratio and vapor velocity results the bigger heat flux and air humidity after passed through the low porous media. Heat transfer was occured in porous media including convection heat transfer with the value of Gr/Re2 smaller than 1.

Analisis Kekuatan Bending dan Kekuatan Impact Komposit Epoxy Diperkuat Serat Pelepah Lontar Saduk, Melsiani Rosdiani Fillipin; Niron, Fransisko Piri
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Natural fibers have been considered as reinforcement in composite materials which is environmentally friendly fiber instead of fiberglass. The use of natural fibers in the composite material is currently growing, along with the increasing use of such materials are widespread ranging from household appliances and industrial sector. The aim of this research was to determine the impact strength and bending strength of lontar fiber composite. The production method of this composite is hand lay-up with random fiber orientation (randomly oriented fiber discontinuous). The compositesÂ were produced with a variety of fiber volume fraction of 10%, 15%, 20%, 25% and 30 %. The bending strength of lontar fiber composite 140.235 MPa and modulus of elasticity of 4440 Mpa were obtained. The impact strength of lontar fiber composite and fiberglass were 0.439J/mm2 and 0.8333 J / mm2 respectively.

Desain dan Optimasi Injection Mold Sistem Slider pada Produk Stick T15 Ni'am, Lutfi Khoirul Miftakhul; Budiyantoro, Cahyo; Rahman, Muhammad Budi Nur
Jurnal Rekayasa Mesin Vol 8, No 3 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The design of injection molding is the initial process to produce a large-scale product of plastic material which heated and injected into the mold. Design of the preform mold using the plastic material polyethylene terephthalate with the construction of the slider, so that the products which was made have undercut and canâ€™t be made in the core section and cavity. The purpose of this design is to design the slider on the product preform. The software which used for this design using CATIA V5R19 and simulation software production using Autodesk Moldflow Insight 2016. The step on designing a unit injection mold in the preform includes several steps. The first step is identify the product, the calculation of the cooling and input the data calculation result to an moldflow. The second step is design construction slider and determine the mold material as well as calculating the construction mold. The third step is pour the results of the design in figure 2D. Based on the analysis results from moldflow obtained cooling optimal.i.e. the type of cooling series type 2, and if can be concluded construction of the mold said to be safe if the stress, the style and the determinationÂ of material which occurs under the stress and style of permit.

Pemanfaatan Panas di Pipa Tekanan Tingggi pada Mesin Pendingin (AC) Aziz, Candra Yusfi Amri; Firdaus, Rahmat
Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The purpose of this research is to know the design of AC cooling machine system by using water cooling media in condenser, to know the influence of cooling water media on condenser to cooling machine performance (AC), to know COP cooling capacity based on the addition of water cooling media in condenser. The experiment was conducted by experimental method, which was used to test the temperature variation by analyzing air temperature (Th), water temperature (Tc), suction and discharge pressure, condenser inlet and outlet temperature, COP and cooling machine efficiency performed every 5 minutes once. The results showed, maximum temperature that can be achieved of cooling machine system is (4.4 oC) at minute 10 for cooling machine with air fan cooling medium (-6,9 oC) at minute 15 For cooling machine with water cooling medium (-12,7 oC) at minute 15 for cooling machine with water cooling medium and air fan. The flowing water flow affects the achievement of the best temperature and efficiency. In this experiment, the result of the mass of water flowing every minute is 0,4603 kg / s and able to stabilize hot calor to reach temperature (32 oC) which can be used for other needs.

Pengaruh Waktu dan Tekanan Gesek terhadap Kekuatan Tarik Sambungan Paduan Aluminium dan Baja Karbon pada Pengelasan Gesek Continuous Drive Pah, Jack Carol Adolf; Irawan, Yudy Surya; Suprapto, Wahyono
Jurnal Rekayasa Mesin Vol 9, No 1 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The objective of this research was to investigate the effect of friction time and friction pressure on the tensile strength of the joining of two dissimilar materials, aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction times of 5 seconds, 7 seconds, 9 seconds, and 11 seconds, at each variation of friction pressures of 24 MPa, 32 MPa, and 40 MPa. Controlled variables in this friction welding process were rotational speed of 1600 rpm, upset pressure of 79 MPa which was applied for 60 seconds and diameter of friction surface of specimens which were 15 mm. The resulting strength of the bonding were than evaluated on the basis of tensile strength. Observations of temperature change during the welding process, the distribution of Vickers hardness values around the bonds area, and micro photographs, were used as support to the analysis. The results showed that the longer friction time was applied, the higher tensile strength of the bonds would be, until it began to decrease after a certain maximum value of the tensile strength had been reached. Increased of the tensile strength of the bonding did not occur linearly due to the variation of friction pressure at 9 seconds and 11 seconds of friction time. At 5 seconds and 7 seconds of friction time, increase of friction pressure caused a linear increase of tensile strength. Higher temperatures in the welding process increased the thickness of brittle layer at the bonds boundary. The increase of the brittle layer thickness causes decrease of the tensile strength of the bonds.

Pengaruh Rasio Laju Alir Gas Nitrogen-Hydrogen serta Gas Pressure pada RF Plasma Nitriding terhadap Surface Hardness Spesimen SUS304 Oerbandono, Tjuk
Jurnal Rekayasa Mesin Vol 7, No 1 (2016)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

RF Plasma nitriding was done on the specimen SUS304. This research had aim to obtain a high surface hardness value as a result of flow rate ratio of Nitrogen-Hydrogen. The experimental research consisted of three models. Each experimental model used varying parameters and constant parameters. Micro Vickers Hardness test was used for testing each specimen of the experimental models. The varying parameters of first experimental model were times of plasma nitriding, ie, 1 hour, 2 hours, 4 hours and 8 hours. The constant parameters were RF-Power Voltage = 250 Volts, DC-Bias Voltage = 500 Volts, N2= 100 (ml/min), H2= 20 (ml/min), Gas pressure (P) = 70 Pa and Heater Temperature (T) = 420oC. The second experimental model contained three varying parameters of nitrogen gas pressure ie, 50 Pa, 60 Pa and 70 Pa. The constant parameters of second experimental model were time of plasma nitriding (t) = 8 Hours, RF-Power Voltage = 250 Volts, Heater Temperature (T) = 420oC, N2 = 140 (ml/min), H2= 20(ml/min). The first and second experimental models had same configuration. The third experimental model used three variations of nitrogen flow rate, ie, 140 (ml/ min), 160 (ml/min), 180 (ml/min). The constant parameters were time of plasma nitriding (t) = 4 hours, RF-Voltage = 250 volts, The Heater temperature (T) = 420oC; H2 = 20 (ml/min), DC-Bias Voltage = 500 Volts, the gas pressure (P) = 60 Pa. The configuration of third experimental model was different with the configurations in first and second experimental models. Surface hardness Values of first experimental model were 379 HV, 348 HV, 474 HV and 387 HV. Surface hardness values of second experimental model were 586 HV, 607HV, 249 HV. Surface hardness values of third experimental model were 313 HV, 574 HV, and 677 HV. from the results were known that nitrogen-hydrogen flow rate ratio into vacuum chamber and gas pressure influenced the surface hardness of SUS304 specimen. The highest surface hardness value of 677 HV was happened at gas pressure of 60 Pa, nitrogen flow rate of 180 (ml/min) and hydrogen flow rate of 20(ml/min).

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Jawa timur

INDONESIA