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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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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 965 Documents
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Simulasi Komputer pada Optimasi Desain Hybrid Plating dalam Proses Bone Healing Mamungkas, Mohamad Irkham; Choiron, Moch. Agus; Suprapto, Wahyono
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Hybrid plating method that combine locking screw and non-locking screw usually used for healing on bone fracture. This methodusedin order to get the smallestdeflectionandpreventpullout. The research purposed to obtain the optimal parameter design locking screw, such as position of locking screw, thickness and width plates by using Taguchi method which obtained level and variations factor. The material used in this study for screw and the plate were stainless steel SS 316 L. The load model used axial load of 1000 N. The number of hole plates were 8, which 4 holes in each section. In one section consist of locking screw and non locking screw Quasi experimental model applied ANSYS Workbench 14.5 finite element software. Results showed the optimum design was 3 locking scews in the left position, the thickness 4 mm and a width of plate 16 mm. The optimum design produce 0,039507 mm of average deflection and it can be denoted that failure and pull out was not occurred.Keywords : Hybrid Plating, Simulation, Deflection, Pull Out
Sintesis Karbon Aktif Berbahan Dasar Mikroalga Chlorella vulgaris Menggunakan Aktivator KOH dan Iradiasi Gelombang Mikro Sukoyo, Agung; Djoyowasito, Gunomo; Wibisono, Yusuf
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.3

Abstract

Microalgae Chlorella vulgaris has been used as a raw material in the synthesis of powdered activated carbon. Dry microalgae was pyrolyzed at a temperature of 500oC for 30 minutes to obtain microalgae charcoal. The combination of chemical activation treatment using KOH with concentrations of 10, 30, and 50% assisted by microwave irradiation have been used to prepare activated carbon. The properties of activated carbon were analyzed included yield, ash content, volatile substance content, pure activated carbon content, iodine solution absorbency, BET surface area and activated carbon imaging using SEM EDX. The results showed that Chlorella vulgaris microalgae has a carbon element content of 16.09% which has the potential to be used as an activated carbon feedstock. The microalgae activated carbon produced has a range of yield of 27.60-48.64%, ash content 27.98-44.23%, volatile substance content 23.08-30.92%, pure activated carbon content 32.69-41.10%, absorption of iodine solution 189.46 - 260.23 mg/g, surface area BET was obtained at 34,933 m² / g, with a pore average of 46.59 nm in the sample with the highest iodine absorption. Activation using microwave irradiation and higher KOH concentration, i.e. 50%, can reduce the yield and an ash content of activated carbon, on the other hand, increase the level of volatile substances and iodine absorption. SEM EDX imaging results show the formation of micropores on the surface of microalgae activated carbon, however the impurities promotes the deterioration of surface area and lowering the absorption performance of microalgae activated carbon.
Studi Numerik Pengaruh Variasi Jumlah Saluran Masuk Pressure Swirl Atomizer Terhadap Karakteristik Spray Purnami, Purnami
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research was conducted to determine the effect of inlet channel number on the spray characteristics of the pressure swirl atomizer using numerical methods. The observed spray characteristics were spray cone angle and discharge coefficient. Pressure swirl atomizer is a nozzle that can atomize fluid using vortex fluid in the mixing chamber, the magnitude of the vortex fluid is affected by the tangential velocity component of fluid at the nozzle inlet. Number of nozzle inlet was varied at 1, 2 and 4 channel. Total surface area of the inlet was kept constant of 1.76 mm 2 for all variation. The fluid used in this study were diesel and Reynolds number was varying at 2000, 2500, 3000, 3500 and 4000. The result show that with the increasing of inlet channel number at a fixed Reynolds number will generate spray with larger spray cone angle. This is due to tangential velocity compunentand swirling flow in mixing chamber increasewith the increasity of inlet channel number. This phenomena ruselt higher spray cone angle. Discharge coefficient also increase with the increasity of inlet channel number. This conditionshow that losses inside nozzle with 4 inlet channel number is smaller than that with less inlet channel number.Keywords: Pressure swirl atomizer, Spray characteristics, Amount of inlet channel, Numerical method.
Ekstraksi Parameter Statistik Domain Waktu dan Domain Frekuensi untuk Mendeteksi Kavitasi pada Pompa Sentrifugal Berbasis Principal Component Analysis (PCA) Kamiel, Berli Paripurna; Prastomo, Niko; Riyanta, Bambang
Jurnal Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.8

Abstract

Cavitation phenomenon frequently occurs on the centrifugal pump which may decrease its performance. It may cause a catastrophic failure which leads to a total breakdown of the piping system if the presence of cavitation is not immediately detected and solved. Recently, the popular method used to detect cavitation is based on pattern recognition. The use of pattern recognition technique requires statistical features which are used as input for building the classifier. The extraction of statistical features is usually taken from the vibration signal which consists of time domain and frequency domain. Previous research tends to use the statistical features extracted from the time domain or the frequency domain solely. There is a research gap that can be explored by combining statistical features extracted from both time domain and frequency domain. In this study, Principal Component Analysis (PCA) is used as a feature’s selection and fault classification. PCA linearly transforms statistical features from the original coordinate system into a new coordinate system called principal components (PCs). The first few PCs are a set of selected features which can be used as a classifier. The classifier evaluates and classifies the new set of vibration data then decides whether it falls into normal condition or cavitation category. The vibration signal is taken from the cavitation test-rig under normal condition by opening the valve, level 1 cavitation by opening 75% of valve, level 2 by 50%, and level 3 by 25%. The data is extracted into 7 statistical features from the time domain and 5 from the frequency domain.  Five hundred sets of vibration data are recorded using an accelerometer which was then divided into 400 set for training and 100 set for testing. The study shows that the classifier using statistical features taken from the time domain and frequency domain gives promising results where the clustering effect between normal and cavitation condition is clearly observed.
Pengaruh Penambahan Langkah Kerja terhadap Unjuk Kerja Motor Bakar Gunawan, Chandra; Siswanto, Eko; Yuliati, Lilis
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.1

Abstract

The duration of fuel-air diffusion in the 4 stroke combustion engine is relatively short, which is 0.02 seconds at 3000 rpm so that at high rotation the level of homogeneity of the fuel-air mixture becomes low. The addition of steps in a 4 stroke combustion engine to a 6 stroke combustion engine is expected to increase the duration of mass diffusion and temperature in the air-fuel mixture. So that the homogeneity of the air-fuel mixture increase and more expansion power of the combustion results. Engine performance testing by reducing the engine speed of 400 rpm at the initial condition of the throttle valve opening by 30% then the results of the performance of the two motors will be compared. The test results show an increase in power and torque in a 6 stroke combustion engine compared to a 4 stroke combustion engine at the same rotation conditions of 15%. As for the value of the specific fuel consumption effective (SFCe), thermal efficiency, and exhaust gas emissions of Hydrocarbon (HC) 4 stroke fuel is still better.
Desain dan Konstruksi Mesin Penyemai Benih Sayuran Portabel Tipe Vakum untuk Pembibitan pada Talam Semai Sagita, Diang
Jurnal Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.7

Abstract

In Indonesia, vegetable seeding technique in nursery plug trays still uses manual mechanism. Furthermore, the small size of vegetable seeds makes it difficult to allocate the seeds evenly (1 seed per planting hole). This study aims to design and construct a portable vegetable seeder with a vacuum-type mechanism for nursery needs in plug trays. The methods used in this study were: 1) preliminary test of seed characteristics, 2) functional analysis of the design, 3) structural analysis of the design using CAD, 4) fabricating a prototype, and 5) performance test of the seeder prototype. Seed characteristic used as reference analysis was mustard green seeds. The nursery plug tray used was TS-128L tray (128 planting holes). The results show that the suction requirement of the seeder was 23.119 Pa and the seed suction holes diameter was 1 mm with a cone angle of 120o. The overall dimensions of the machine are 585 × 430 × 105 mm with 5.26 kg of weight. The suction power uses 220 V AC electric blower with 1.5 A of electric current, 2.5 inches of inlet hole, 3600 rpm of blower rotation and 412.02 Pa of suction power (bigger than the suction requirement of the seeder). The performance test results of seeder using mustard green seeds have been able to achieve the uniformity level of 93.75% (1 seed per planting hole), germination percentage of 95.05% and seeding capacity of 102 trays/hour.
Pola Aliran Dua Fase Gas - Fluida Non Newtonian Melalui Belokan Pipa Kusumaningsih, Haslinda; Hamidi, Nurkholis; Sabila, Adriazka Fasa
Rekayasa Mesin Vol 10, No 3 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.03.12

Abstract

Two-phase flow applications can be used in chemical reactors, fuel cell and a cooler of electronic devices. Nowadays, the study on multiphase flow is concern with the gas-non Newtonian liquids flow. Since, non-Newtonian liquids commonly used in both industrial and medical applications such as blood flow, polymer and chemical solutions. The viscosity of a non-Newtonian liquid cannot be described by Newton?s law viscosity. The viscosity will affect flow behavior in pipes depends on the rheology of the fluid. The purpose of this study is to further investigate the flow pattern characteristic of gas-Newtonian/non-Newtonian liquid two-phase flows in a normal channel. Ultrapure water, polyacrylamide aqueous solutions (PAM) were used as test fluids, while argon gas as the test gas. Liquid and gas were introduced in T-junction, which placed on the upstream of the test section. In this study, the polyacrylamide concentration was variated on 0.1% wt and 0.4% wt. Moreover, the flow rate of liquids tested were variated on 0.1167 m3/s, 0.183 m3/s, 0.25 m3/s; and 0.283 m3/s. Therefore, the gas tested was variated on 0.083 m3/s, 0.167 m3/s, and 0.25 m3/s. The circular channel and bend pipe were used in this study, which has hydraulic diameter of 25.4 mm. The high-speed video camera was used to record the flow patterns in the bend as the test section. The flow pattern, bubble length, bubble velocity and void fraction were determined by analyzing the video image of the flows. Slug and plug flow patterns mostly appear in this study for each variation of liquids tested. Increasing gas superficial velocity induced the longer bubble. Furthermore, because of the higher viscosity of the non-Newtonian liquid,  the bubble nose of gas-non Newtonian liquid two-phase flow becomes sharper than the bubble nose of gas-Newtonian liquid two-phase flow. 
Unjuk Kerja Kotak Pendingin Peltier dengan Unit Pembuang Panas Heat Sink Fin-Fan dan Single Fan Heat Pipe Mirmanto, M.; Alit, Ida Bagus; Anggani, Yudi
Rekayasa Mesin Vol 10, No 1 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.01.1

Abstract

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.
Pitting Depth Prediction Caused by SRB using Empirical Equation Fatah, Martin; Ismail, Mokhtar C; Wahjoedi, Bambang A; Rusdi, Halim; Sulistyo, Eko
Jurnal Rekayasa Mesin Vol 10, No 1 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.01.6

Abstract

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.
Pengaruh Temperatur pada Proses Hot Isostatic Pressing terhadap Porositas, Keausan dan Mikrostruktur Sludge Powder Duralumin Multazam, Ahmad; Suprapto, Wahyono; Pratikto, Pratikto
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sludge is the starting raw material in the process of forming wheels with forging method. Performance wheels strongly influenced by the quality of sludge. Sludge should have physical properties that light , soft and easy strengthened. One material that can be used as materials for sludge are: duralumin material. Duralumin is another name for aluminum & copper alloy (Al / Cu) with a Cu content of about 4 %. Making sludge powder duralumin with powder metallurgical methods can improve the quality of sludge.Making the specimen begins to weigh 100 g of powder duralumin and enter into a mold that has been in the preheating (100 ° C). Wait about 10-15 minutes until the mold temperature reached (450 ° C), (475 ° C) , (500 ° C) , and (525 ° C). Perform (hot iso- static pressing) HIPing by using a hydraulic press machine at 50 MPa and kept constant for 30 minutes. After the specimens were removed from the mold. The results showed the higher temperature tends to result in a percentage sitering porosity and wear rate decreases. This is evidenced by the percentage of porosity at a temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 1.193 ° C , 1:03 ° C , 0757 ° C and 0733 ° C. While the wear rate at the sintering temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 0.00095 g / s , 0.00080 g / s , 0.00059 g / s , 0.00050 g / s. Then from the microstructural observations with 500x magnification SEM image shown that with increasing temperature HIPing likely to result looks smooth surface of the test specimen.Keywords: Powder Metallurgy, Temperature HIPing, Duralumin, Sludge, Porosity, Wear, Microstructure.

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