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[Modifikasi Perilaku Dinamik Struktur dengan Massa Terkonsentrasi ]]>
<![CDATA[Hutahaean, Ramses Yohannes]]>
<![CDATA[ Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.7
<![CDATA[One of the vibration problems that occurs at mining industries is when they increase production capacity as happen in the PT.Freeport Indonesia, and then we need to install a new machine with new rotary speed, so that it will increase the speed of rotary machine on the conveyor, if the speed of rotary machine close to the one of natural frequencies of the machine structure, this will cause resonance in the structure , so its is necessary to modify the dynamic behaviour of the structure to shift a certain number of these natural frequencies. In this study, shifting a certain number of natural frequencies of a dynamic system to desired values with the concentrated mass modifications is considered. The method to shifting a certain natural frequencies is based on the Sherman-Morrison formula and uses the receptances that are related to the modification coordinates of the original system. The method yields a set of nonlinear equations which equal the number of shifting frequencies, then the necessary masses are estimated by solving these equations numerically. The efficiency of the method is shown by various example. Its shown the method is very effective and can be used for real applications.]]>
<![CDATA[Pengaruh Clamping Frame Kayu Meranti dan ASTM A36 pada Friction Spot Joining AL 1100 dan PVC ]]>
<![CDATA[Raharjo, Rudianto]]>;
<![CDATA[Hamidi, Nurkholis]]>;
<![CDATA[Widodo, Teguh Dwi]]>;
<![CDATA[Bintarto, Redi]]>;
<![CDATA[Habibulfalah, Endi]]>
<![CDATA[ Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.12
<![CDATA[In this paper, the effect of welding parameters on the shear strength of Al-PVC hybrid structures was discussed. This Research developed welding parameters in the form of Plunge Depth, heating time, and clamping frame materials. By these different parameters would result in different shear strength of welded materials. Following optimization of the process, a detailed comparison of the properties and microstructures of two different materials (meranti wood and ASTM A36 Steel) would affect to different values of thermal conductivity. The Aluminum used was Al 1100, which was welded by using a friction stir spot welding method with Polyvinyl Chloride (PVC). In this study, by the different heating times, the shear test was carried out with the ASTM D3163 standard. In this study, it was found that the maximum temperature of Aluminum occurs during the 2nd second of the welding process and then decreased in the 5th second until 60th second. However, the optimum shear strength found at 20th second. Following heat transfer and degradation materials, the 2mm plunge depth has a higher temperature and higher shear strength than 1,5mm plunge depth. Differences in the response of the two depth were attributed to the difference in mechanical interlocking. This study found that the ASTM A36 clamping frame maximum shear load of 182.4 N is higher than meranti wood frame of 125.5 N. Differences in these value are attributed to the differences of the thermal conductivity, which meranti wood had a lower thermal conductivity than ASTM A36. These have findings significant implications for the commercial application of welding hybrid structures. The best way to take advantage of the benefit of AL-PVC Structure Hybrid for friction stir spot welding would appear to be 20 second heating time, 2mm plunge depth with ASTM clamping frame.]]>
<![CDATA[Karakteristik Perpindahan Panas Alat Penukar Kalor Tipe Staggered Fins Berisi Material Fasa Berubah dari Minyak Kelapa pada Proses Pembekuan ]]>
<![CDATA[Irsyad, Muhammad]]>;
<![CDATA[Amrizal, Amrizal]]>;
<![CDATA[Yulian, Aji Muhammad]]>;
<![CDATA[Susila, M. Dyan]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.3
<![CDATA[Indonesia, located in the tropics, has a dependency on air conditioners to obtain the thermal comfort of the room. This phenomenon resulted in the electricity consumption of the building increased significantly. On the other hand, Indonesia has the potential for cold air at night that is in the range of the thermal comfort temperature of the room or lower. The potential for cold air can be exploited by using Phase Change Material (PCM). Coconut oils are commodities that are widely produced in Indonesia. These materials have good potential to be developed as PCM because they have high latent heat and the temperature of phase change matches the temperature of the cold air at night. This research used a staggered fins type heat exchanger with a total of 39 pieces, mounted zig zag with the number of lines was 11. Fins were made of hollow aluminium with a size of 1x0.5 inches with a height of 150 mm. The PCMs used were coconut oil with a mass of 1.5 kg. The temperature and velocity of entering cold air were 20oC, 1 m/s, 2 m/s and 3 m/s. This study aims to determine the ability of PCM to release thermal so that it undergoes phase changes. The results showed that low cold airflow velocity resulted in subcooling while at 3 m/s, subcooling did not occur. The most considerable cooling rate occurred at 3 m/s that was 0.16oC/min. The percentage of solid mass formed after 60 minutes for each velocity was 37.8%, 58%, and 76.2%. The most considerable amount of heat absorbed by air was 167.7 kJ. Based on this, coconut oils are very potential to be developed by observing the temperature and velocity of the enter cold air.]]>
<![CDATA[Pengaruh Temperatur Reformer Bed terhadap Performa Propane Steam Reformer Menggunakan Comsol Multiphysics 5.3ª ]]>
<![CDATA[Kusumastuti, Rizky]]>;
<![CDATA[Tseng, Chung-Jen]]>;
<![CDATA[Wijayanti, Widya]]>;
<![CDATA[Sasmoko, Sasmoko]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.8
<![CDATA[Steam reforming is a method for producing hydrogen gas as a solution for renewable energy generation. One source of hydrogen in a steam reformer is propane gas. The advantage of propane gas is the ease of transportation and storage. The production of hydrogen gas in a steam reformer is certainly influenced by supporting factors such as the temperature of the reformer. In this study, propane steam reforming was simulated in 3D with COMSOL Multiphysics 5.3ª software with bed reformer temperatures varying from 600, 650, 700, 700, 750, 800 and 850 oC with steam to carbon (S/C) ratio 3. The results show that increasing the temperature causes the density of the reformer to decrease, which in turn results in increased gas velocity. In addition, an increase in temperature in the bed reformer increases propane conversion to 87.8% and produces about 40% hydrogen at 850 oC.]]>
<![CDATA[Analisis Getaran pada Screw Compressor Akibat Pengaruh Putaran Rotor ]]>
<![CDATA[Sangian, Hadrianus]]>;
<![CDATA[Rahman, Deni Arif]]>;
<![CDATA[Rudiwanto, Rudiwanto]]>;
<![CDATA[Subekti, Subekti]]>;
<![CDATA[Hamid, Abdul]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.13
<![CDATA[The air compressor engine is becoming a requirement for both large and small industries production machines instead of the drive system of the driven motor becomes pneumatic. In a pneumatic drive system requires certain air pressures are adjusted to the needs of the industry. Compressor engine which widely used is a screw compressor. On the screw compressor, male and female rotors in the air producer are part of the very important because as the primary producer of compressed air from the motor rotation, then the maintenance must be considered regularly, especially vibrations resulting. The study was conducted to test the amount of vibration that occurs on the screw compressor rotor from the rotor rotation variations using vibration measuring devices FFT analyzer. Measurements are made by attaching the accelerometer sensor to the x, y, and z-axis of the compressor screw rotor casing. Three variations rotors are 2557 rpm, 5042 rpm, and 7508 rpm to get a reference to the magnitude of rotation that is best used in the refrigeration machine is reviewed of the amount of vibration produced. From the results of testing and data collection, it can be concluded that vibration is measured using an FFT analyzer of vibration values the highest is at 7508 rpm which is 7.768 Hz and the lowest is at rotation 2557 rpm of 6,442 Hz. Characteristics of screw compressor vibrations in various rotation conditions can be unbalanced due to the emergence of amplitude at 1x rpm it also experiences a misalignment due to generating vibrations which are higher than usual 2x rpm. ]]>
<![CDATA[Pengaruh Panjang Batang dan Bentuk Daun Ekor pada Turbin Angin Sumbu Horizontal dengan Mekanisme Furling terhadap Performa Turbin ]]>
<![CDATA[Hidayatullah, Basori]]>;
<![CDATA[Al-Janan, Dony Hidayat]]>;
<![CDATA[Saputro, Danang Dwi]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.4
<![CDATA[Small-scale wind turbines that operate at low wind speeds regularly will face yawing performance problems. The purpose of this study was to determine the effect of stem length and tail shape on turbine performance through the power generated and the yawing angle and furling angle that formed. An experimental method was used in this research. Tail stem length variations that used were 0.35 m, 0.53 m and 0.71 m. The tail shape varies Rectangular, Trapezoidal, Triangular, Up Rectangular, Down Rectangular, Up Trapezoidal, Down Trapezoidal, Up Triangular and Down Triangular. Wind speed used in this case is 4.3 m/s, 4.8 m/s and 5.2 m/s. The tests carried out at Marina Beach, Semarang. Power measurements using a digital multimeter. Yawing and furling angle measurements using video recordings and measured using Solidworks. Wind speed measurements using a digital anemometer. The results showed that the best configuration is the triangular tail shape with 0,53 m of tail stem length. The power generated of this configuration has increased from wind speed of 4.3 m/s (0.816 Watt) to 4.8 m/s (1.140 Watt) and decreased at a wind speed of 5.2 m/s (1.081 Watt). This phenomenon is related to the design where at wind speed above 5 m/s, the design of furling mechanism will work to reduce the capture of wind energy by diverting the direction of the rotor towards the wind direction. So that the damage of the blade due to higher wind pressure can be minimized. ]]>
<![CDATA[Pengaruh Thermal Shock dan Komposisi Grafit, Kaolin (Clay) terhadap Struktur Makro dan Ketahanan Impact Kowi Berbahan Dasar Limbah Evaporation Boats ]]>
<![CDATA[Nurrohmah, Sinta Indiarti]]>;
<![CDATA[Rusiyanto, Rusiyanto]]>;
<![CDATA[Widodo, Rahmat Doni]]>;
<![CDATA[Sumbodo, Wirawan]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.15
<![CDATA[The purpose of this study was to determine the effect of thermal shock and composition of graphite, kaolin (clay) on the macrostructure and impact resistance of crucible based on the waste of evaporation boats. The variation applied was composition waste of evaporation boats, graphite and kaolin 50%:25%:25%; 40%:30%:30%; 70%:15%:15%. Then the thermal shock standard temperature variation is ∆T = 100°C - 500°C. Specimens formed according to the ASTM D256 size (63.5x12.7x12.7) mm with compaction load 80 kg/cm2. Continuing the sintering process at a temperature of 1150°C holding time of 2 hours. Tests include XRD test for the waste of evaporation boats, thermal shock test, impact test and macro photo. The results showed that the highest average impact resistance is 0.01772659 Joule/mm2 with the composition of 50%: 25%: 25% without thermal shock. The lowest average resistance impact is 0.00637474 Joule/mm2 with the composition of 70%: 15%: 15% and 500°C thermal shock temperature. Based on the data, the higher treatment of temperature in thermal shock makes the lower impact resistance of the specimen.]]>
<![CDATA[Rancang Bangun Mesin Pencacah Limbah Kotoran Sapi ]]>
<![CDATA[Arifin, Zainal]]>;
<![CDATA[Prasetyo, Singgih Dwi]]>;
<![CDATA[Triyono, Teguh]]>;
<![CDATA[Harsito, Catur]]>;
<![CDATA[Yuniastuti, Endang]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.6
<![CDATA[Cattle farms produce waste which consisted of cow excrement in the form of solid, liquid, gas or cattle feed residual. Utilization of cow manure waste into organic compost requires proper processing technology which includes the technology of solid manure pulverizing and the technology of mixing raw materials. This research focuses on designing a cattle dung waste pulverizer. The methods used are numerical calculations, simulations using the Fusion 360 software, and fabrication based on Design for Manufacture and Assembly (DFMA). The main parts of the design include pulverizer, engine frame, cover (input and output hoppers), diesel motor, transmission belt and pulley. The safety factor obtained for the frame section was 4,645, for the cover section was 11.3, and for the counter section was 2,009 with assumptions of uniform load distribution of 20000 N. The power required for the design was 6.6 HP. The cattle dung waste pulverizer was built and tested using a diesel motor with a maximum power of 13 HP. The cattle dung waste pulverizer's capacity was 1500 kg/hour.]]>
<![CDATA[Karakteristik Densitas Dan Indeks Bias Minyak Atsiri Daun Jambu Kristal (Psidium Guajava) Menggunakan Metode Microwave Hydrodistillation Dengan Variabel Daya Dan Rasio Bahan : Pelarut ]]>
<![CDATA[Erliyanti, Nove Kartika]]>;
<![CDATA[Priyanto, Anugerah Dany]]>;
<![CDATA[Pujiastuti, Caecilia]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.11
<![CDATA[Crystal seedless guava is a new horticultural commodity that is cultivated in Indonesia and has many benefits. Crystal seedless guava has the potential of essential oil to be extracted from the leaves. Extraction using the microwave hydrodistillation method is an alternative to improve the efficiency and effectiveness of the essential oil extraction process. The purpose of this study was to determine the effect of microwave power and the feed to solvent ratio toward the characteristics of density and refractive index of essential oil from crystal seedless guava leaves. The reduced size crystal seedless guava leaves were extracted by microwave using aquadest as solvents with the feed to leaves. The ratio of feed to solvents used in this study was 1:4, 1:5, 1:6, and 1:7 (weight/volume or w/v). The second variables were performed using various microwave powers of 300, 450, and 600 Watts. The extraction conditions were carried out at ± 100 oC at one atmospheric pressure for three hours. The results showed that microwave powers and material to solvent ratios had significantly effect toward the density of essential oil from crystal seedless guava leaves. However, the variables had no significant difference in the value of the refractive index. The higher number of microwave powers and the solvent to feed ratios had a higher number of density. The highest density and refractive indexes were 0.948 grams/ml and 1,49862, respectively. The best extraction condition to extract the essential oil from crystal seedless guava leaves using microwave hydrodistillation was performed by microwave power of 600 Watt with 1:7 (w:v) as leaves to solvent ratio.]]>
<![CDATA[Karakterisasi Sifat Termofisika Paduan Titanium Ti6Al4V ]]>
<![CDATA[Tajalla, Gusti Umindya Nur]]>;
<![CDATA[Ismail, Andi Idhil]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 11, No 2 (2020) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2020.011.02.2
<![CDATA[Manufacturers are pushed to use superalloys such as titanium alloys in the aerospace part due to environmental and economic issues. The refractory properties of titanium alloys result in rapid and premature wear of the cutting tools, especially by thermal diffusion. Therefore, the purpose of this paper is to focus on understanding the characterization of TiAl6V4 in thermo-physic properties. X-ray diffraction (XRD), scanning electron microscope (SEM), electrical resistivity against temperature test, and differential scanning calorimetry (DSC) were conducted to analyze the relationship of phase transformation to thermal properties. Phase analysis showed that TiAl6V4 is composed of two-phase a and b creating a duplex microstructure in which the surface fraction contains about 92,5 % and 7,5 %, respectively. Electrical resistivity against temperature test demonstrated the phase transformation of a to b occurred at 1017°C. This study revealed that the phenomena of phase transformation affected the thermal properties, i.e., thermal capacity, thermal diffusivity, and coefficient of thermal expansion.]]>
