Rekayasa Mesin
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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<![CDATA[Pengaruh Parameter Proses Incremental Backward Hole-Flanging terhadap Ketebalan Kerah pada Alumunium 1050A ]]>
<![CDATA[Fakhruddin, Muhammad]]>;
<![CDATA[Choiron, Moch. Agus]]>;
<![CDATA[Purnowidodo, Anindito]]>
<![CDATA[ Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.4
<![CDATA[Conventional hole-flanging process in a small batch is sometimes costly or almost impossible due to the variety of the product profile. Recent studies showed that modern manufacturing was developed to overcome the limitation of the conventional hole-flanging process. Incremental backward hole-flanging (IBHF) was one of the strategies that developed to overcome this particular limitation. The main objective of this research was to investigate the influence of IBHF process parameters toward collar thickness of the product. It enables to measure the impact and behavior of each process parameters, i.e., forming speed, axial and radial forming step size toward the particular response parameter. The result showed that axial and radial forming step size was the main influence and the forming speed has a slight effect towards collar thickness. The behavior of each parameter was increased forming speed and radial forming step size would decrease collar thickness, whereas increased axial forming step size would increase collar thickness.]]>
<![CDATA[Identifikasi Efek Heating Rate terhadap Laju Kinetika Reaksi Pirolisis Kayu Mahoni dengan Thermal Analysis dan Termogravimetry ]]>
<![CDATA[Wijayanti, Widya]]>
<![CDATA[ Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.9
<![CDATA[The study was conducted to investigate the biomass pyrolysis using mahogany wood as the feedstock. Chemically, mahogany wood contained complex biomass compounds, consisting of cellulose, hemicellulose, and lignin. Each biomass compound had its degradation at a certain temperature. Therefore, their compounds will be pyrolyzed at some different temperatures to understand the certain one. In the experiment, the biomass was hydrolyzed based on the temperature differences from room temperature to a temperature around 1000ºC (1273 K). We identified pyrolysis kinetic rate and measured some appropriate pyrolysis temperatures to accomplish the pyrolysis process. Afterward, the investigation of its thermal degradation used Thermal Analysis and Thermogravimetric (TGA) analysis. It would be obtained the estimation of energy needed to obtain a mathematical equation determined by the dependencies of the pyrolysis temperature by using LINSEIS STA Platinum Series. The mathematical equation was gained by using the temperature difference profiles (differential thermal analysis-DTA) and the biomass weight loss (difference thermogravimetry-DTG) by means of TGA. It was measured under the inert condition without Oxygen at the heating rate of 400°C/h and 800°C/h. By using order-1 differential equations, the activation energy, and pre-exponential factors also were determined in the mathematical equation of the kinetic reaction rate equation as k1 = 7.9033 for a heating rate of 400°C/h and k2 = 9.7745 for heating rate 800°C/h.]]>
<![CDATA[Identifikasi Sumber Bising Berdasarkan Sinyal Campuran dengan Algoritma Minimum Variance Distortionless Response Weighted (MVDRW) pada Mesin Kompresor ]]>
<![CDATA[Vinaya, Anindita Adikaputri]]>;
<![CDATA[Aviva, Nurul Dwi]]>;
<![CDATA[Prasetyo, Andhika Eko]]>
<![CDATA[ Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.5
<![CDATA[The vibration of the rotating engine can produce mixed sound and noise. The purpose of this study is to localize the noise sources by using mixed signals. The angular spectrum method with the Minimum Variance Distortionless Response Weighted (MVDRW) algorithm was used in this study. The mixed signal recording of a compressor engine with turbine drive was performed in this study. The mixed signal consists of 3 sources that produced from some parts of the compressor engine in the real plant. The experimental set results, at a distance of 60 cm, there are 3 noise sources that located at 44 °, 99 °, and 151 ° of the axis with different spatial positions 1 ° at source 1, 1 ° at source 2, and 1 ° at source 3 of the experimental set. Based on the results, the noise source on the compressor component is at source 2, the opposite side turbine.]]>
<![CDATA[Studies the Cold Cooling using Bio-Nanofluids, Characteristics and Applications in Milling Operations on High-Hardness Steels ]]>
<![CDATA[Sugiantoro, Bambang]]>;
<![CDATA[Sutarno, Sutarno]]>;
<![CDATA[Sakuri, Sakuri]]>;
<![CDATA[Rusnaldhy, Rusnaldhy]]>
<![CDATA[ Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.10
<![CDATA[The cooling system has an important role in the quality of machining results, the cooling fluid (air/fluid) are developed to be able to reduce heat and friction arising from the formation of the product, but also environment-friendly. The use of natural oils has been tested in various machining conditions with a minimum quantity lubrications (MQL) method, including the addition of materials that can improve fluid convective properties. Cooling performance with natural materials results in surface roughness according to product smoothness requirements according to ASTM classification and is able to maintain a low tool temperature and reduce chatter/tools vibration. Improvement of the MQL process, temperature, and compressed air pressure conditions determine cooling performance, the lower the compressed air temperature will increase the fluid's ability to reduce tool temperature and increase durability and tool life. The process of forming steel with high hardness requires a cooling system with special conditions. The properties of natural oils will be enhanced by the convective thermophysical properties by the addition of Titanium Oxide (TiO2), CuO and Aluminum Oxide (AL2O3). Natural oils used in the study are corn oil, sunflower oil, water with the addition of nanoparticles. The formation of nanofluids uses magnetic stirrer with varying time and rotation speed, and % weight ratio. The MQL System is equipped with cold air from the compressor which is cooled by utilizing the evaporation/refrigeration process which is kept constant at 10oC. The cooling system is equipped with a microcontroller/interface to keep the air temperature/pressure constant. In this paper the data presented is a study of cooling in the hard milling process to determine the most nanofluid/dominant factors that affect the results. The results showed that the use of cutting fluids reinforced by nanoparticles in natural oils in a minimum amount increased lubrication properties. There is a significant effect on the use of cooling fluid types with surface roughness, fluids with high lubrication properties, significant to reduce surface roughness, cutting temperature and power consumption. The nanofluid prove was able to apply in an environment-friendly manufacturing process very promising.]]>
<![CDATA[Unjuk Kerja Kotak Pendingin Peltier dengan Unit Pembuang Panas Heat Sink Fin-Fan dan Single Fan Heat Pipe ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Alit, Ida Bagus]]>;
<![CDATA[Anggani, Yudi]]>
<![CDATA[ Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.1
<![CDATA[Nowadays, technology is growing rapidly. A refrigerator is one of the technology applications by using heat transfer phenomena. However, the existing refrigerators in big size, need large power, and able to damage the ozone because most of the refrigerators utilize CFC. It is necessary to create a compact refrigerator with low energy needed and environmental friendly. In this study, a small cooler box of 24.5 cm x 20 cm x 28.5 cm with 2 modules Peltier SP 1848-27145 type arranged in cascade was used as a refrigerator. The data were logged by using the data logger DAQ MX 9714 NI that was connected to the PC by using LabView. In this experiment, 22 Watt of the electric power was used and 350 ml water was placed on the cooler box room. The results show that the temperature of the cooler box room with a single fan heat pipe is lower than the heat sink fin-fan. Furthermore, the temperature of the cooler box room with the single fan heat pipe where 350ml water was placed is lower than the cooler box room without the single fan. Moreover, the COP of the cooler box is significantly affected by the heat dissipation unit.]]>
<![CDATA[Pitting Depth Prediction Caused by SRB using Empirical Equation ]]>
<![CDATA[Fatah, Martin]]>;
<![CDATA[Ismail, Mokhtar C]]>;
<![CDATA[Wahjoedi, Bambang A]]>;
<![CDATA[Rusdi, Halim]]>;
<![CDATA[Sulistyo, Eko]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.6
<![CDATA[Microbiologically influenced corrosion (MIC) is a serious problem in the oil and gas industry. The most common microorganism responsible for MIC is sulfate-reducing bacteria (SRB) which produces detrimental sulfide ions into the environment. Currently, there are some prediction models that develop to predict corrosion rate caused by SRB. However, among the models, the prediction is limited to predict the general corrosion rate, whereas, SRB caused localized corrosion. Thus, the objective of this work is to predict the pitting depth caused by SRB using available empirical equation. The study showed that the pitting depth increased with the increasing of sulfide concentration. In contrast, the pitting depth decreased with increasing sulfite concentration. The decreasing of pitting depth is related to the inhibitive FeS film formed, while the increasing of pitting depth is caused by the decreasing of the film thickness in the presence of sulfite.]]>
<![CDATA[High Temperature Cyclic Oxidation Behaviour Ternary Ni-Al-Ti Alloys doped with Ge at 1200oC ]]>
<![CDATA[Setiawan, Yuniarto Hendrik]]>;
<![CDATA[Ambardi, Pradoto]]>;
<![CDATA[Prajitno, Djoko Hadi]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.11
<![CDATA[Ni base alloys are widely used for high temperature applications, such as pressure vessel , turbine blade. Ni-base alloys possess oxidation resistance, creep resistance, fatigue resistance, the stability of the microstructure and good mechanical properties at elevated temperatures. The Ni-Al-Ti alloys were melted in a single arc melting furnace under ultra high argon atmosphere.  Cyclic oxidation of the alloys was performed in air furnace at 1200 °C temperature for 25 cycles Each cycle consisted of 1 hr heating at 1200°C in an alumina tube furnace followed by 30 min cooling at room temperature. The results show that the higher addition of Ge element content can improve the mechanical properties and oxidation resistance of Ni based alloys. X-ray diffraction examination showed that the compounds were formed on the alloy after smelting Ni3Al, Ni3Ti, Ni3Ge, Ni and Ni2AlTi. While the oxide on the alloy after oxidizing to form a compounds NiO, NiTiO3, GeO2, and TiO2. In the SEM-EDS examination showed that the composition of Ge formed more dominant in the area under the element Ni oxide layer. The higher the Ge element content in the alloy has improved the resistance of the alloy indicated by the thin layer of oxide formed on the surface of the alloy.]]>
<![CDATA[Perilaku Tarik Komposit Laminat Serat Kulit Waru-Aluminium ]]>
<![CDATA[Suteja, Suteja]]>;
<![CDATA[Purnowidodo, Anindito]]>;
<![CDATA[Darmadi, Djarot B.]]>;
<![CDATA[Sari, Nasmi Herlina]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.3
<![CDATA[Waru fiber-aluminium laminate composite is engineering materials which have high stiffness, strength properties and weight to strength ratio. The aim of this study is to find out the effect of the number of waru fiber to tensile strength on laminate composite waru fiber-Aluminium. The process of laminating composite waru fiber-aluminium is done by vacuum infusion resin method with layers variation 1, 2, 3, 4Â and fiber direction 45/45 angle woven basket. The result shows that the tensile strength of the waru-Al fiber composite decreases and the elongation value of the composite increases due to the addition of layers of fiber waru lower bond strength on adhesive-aluminum and adhesive-waru. The lowest tensile strength of 153,642 MPa has occurred in composite with 4 layers of waru fibre.]]>
<![CDATA[Pengaruh Lip Thickness Turncated Nozzle Sudut Luar terhadap Karakteristik Api Difusi Concentric Jet Flow ]]>
<![CDATA[Huda, Ahmad Akromul]]>;
<![CDATA[Widodo, Agung Sugeng]]>;
<![CDATA[SIswanto, Eko]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.8
<![CDATA[Diffusion combustion is a daily combustion process where is often used primarily in industrial systems. An optimal burner design is needed to get more efficient combustion results. Then the shape of the burner nozzle greatly affects the turbulence between the fuel and air which forms the flow recirculation zone. The flow recirculation zone functions to produce homogeneous mixing and get a more perfect combustion. Recirculation zones are formed to disrupt flow rates, causing vortices and backflow around the end of nozzle. This research uses burner concentric jet flow. The lip thickness of the outer angles turncated nozzle are used 16 mm, 12 mm, 8 mm, 4 mm, and 0 mm length variation To obtain flame stability, the lift off and blow off limits are used with variations in air velocity. Thermocouples are used to measure the flame temperature distribution. The numerical simulations are used to reinforce this study. The results showed that the characteristics of the concentric jet flow diffusion affected by the use of the lip thickness of the outer angles turncated nozzle. The highest concentric jet flow diffusion stability is at 16 mm nozzle. The highest concentric jet flow diffusion temperature is at 12 mm nozzle. Experimental and numerical simulations show the perfect combustion on the 12 mm lip thickness nozzle. This can be seen by direct photographs of blue-dominated flames and the visualization of the temperature contour distribution which is dominated by red.]]>
<![CDATA[Analisis Thermal Nilai Kalor Briket Ampas Batang Tebu dan Serbuk Gergaji ]]>
<![CDATA[Wibowo, Rianto]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2019.010.01.2
<![CDATA[Availability of fossil fuels are increasingly rare, result in rising fuel prices. Hence, alternative fuel needs to be examined. In this study a mixed composition of bagasse charcoal and sawdust used. The two material then mixed with starch adhesives to produce briquettes with different compositions. This study aims to determine the thermal characteristics of briquettes with a variety of different compositions. This study uses a briquette composition variations sugarcane bagasse and sawdust 100%: 0%, 75%, 25%, 50%: 50%, 25%: 75%, and 0%: 100%. This type of research is the experimental method. Testing the thermal characteristics of charcoal briquettes bagasse and sawdust using a bomb calorimeter and boil a liter of water to determine the calorific value and the rate of combustion. The results showed that the briquettes with a variation of 100% : 0% has the highest calorific value of 4117 cal/gr and the lowest firing rate of 0,155 gr/min. Sawdust briquettes 100% has the lowest calorific value of 3657 cal/gr and the highest firing rate of 0,268 cal/g. There are differences in calorific value and the rate of combustion of charcoal briquettes bagasse and sawdust with a variety of different compositions. So it can be said that the longer the briquettes burning speed, the higher the value calorific]]>
