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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.
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Articles 37 Documents
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Search results for , issue "Vol. 16 No. 2 (2025)" : 37 Documents clear
IMPROVED HARDNESS AND CORROSION BEHAVIOUR OF ALUMINIUM 6061 ALLOY THROUGH ECAP PROCESSING Sekaringgalih, Ratri; Putrayasa, I. Nyoman Gede; Puspasari, Vinda; Wardono, Joko Tri; Yustisia, Ari; Ari Kurniawan
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1524

Abstract

The study was done to evaluate the effect of equal channel angular pressing (ECAP) processing on the hardness, optical morphology, and corrosion behavior of Al-6061 alloy. The samples were first annealed, and continued with ECAP process using the Bc route at 120° of internal channel angle with variation of passes (one, two, three, and four). The examination of corrosion resistance of Al-6061 alloy was examined using open circuit potential measurement, tafel polarization, and cyclic polarization. Moreover, the morphology of Al-6061’s surface after corrosion test was also studied using an optical microscope. The hardness test increased gradually with the addition of pass number in ECAP processing from 48.60 HB (0-pass) to 110.8 HB (4-passes). ECAP processing affects the microstructure of Al-6061 alloy, where the elongated grains are aligned parallel to the extrusion direction. Furthermore, the grain size of samples with higher pass numbers is more homogeny than samples with lower pass numbers. Meanwhile, the Tafel Polarization curves showed that ECAP processing in all samples decreased the corrosion rate from 0.6263 mmpy (as-annealed sample) to 0.1508 mmpy (4-passes sample). This phenomenon reveals that the corrosion resistance of Al-6061 alloy samples raises by the existence of ECAP processing. According to the morphological observation of Al-6061 samples, grain refinement due to ECAP processing could improve corrosion resistance.
INVESTIGATION OF ATMOSPHERIC CORROSION OF LOW-CARBON STEEL IN KUALA TANJUNG BATU BARA Affandi, Affandi; Nasution , Arya Rudi; Lubis , ‪Riadini Wanty; Tanjung, Iqbal; Ananda, Rizki; Huzni , Syifaul
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1555

Abstract

Corrosion is one of the most problematic issues in the material industry that may generate tons of drawbacks. In recent years, Kuala Tanjung has experienced an increase related to the development of infrastructure including trestles and docks that are capable to accommodate mother vessels, containers, and stockpile tanks. The growth of industrial estate occurring would lead to a consideration that Kuala Tanjung might be possible to be an International Hub Port. Despite all these development efforts, the detrimental effects could lead to the quality of water, air, and soil caused by industrial waste and consequently the corrosion attack would easily occur. This condition is exacerbated by the lack of atmospheric corrosiveness data in Kuala Tanjung Batu Bara. Then, it is necessary to investigate the corrosion rate using the weight loss method and refer to ASTM G – 1. Specimen dimensions and test racks are designed based on ASTM G – 50 standards. The aim of this study is to investigate the atmospheric corrosion rate of low-carbon steel and map the atmospheric corrosion in Kuala Tanjung, Batu Bara. The research site is divided to six locations, namely points A, B, C, D, E, and F. The Low-carbon steel test specimens conducted use elbow steel profiles, plates, and quadrangles. Testing is carried out for six months with data collected once every two weeks. The results of this study show that the corrosion rate values reach 0.0564 – 0.5230 mpy for elbow profiles, 0.0552 – 0.4984 mpy for plate profiles, and 2.1341 – 5.2022 mpy for quadrilateral profiles. These results indicate that the corrosion rate of low-carbon steel in the Kuala Tanjung is still relatively safe as well as the atmospheric corrosiveness maps can be created at each location.
MORPHOLOGY, STRUCTURE AND MECHANICAL PROPERTIES OF NATURAL CELLULOSE FIBER FROM OIL PALM FROND FIBER (ELAEIS GUINEENSIS JACQ) Sari, Martina Puspita; Purnowidodo, Anindito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1590

Abstract

Natural fiber is one of the innovations in the development of renewable materials from composites which are considered more environmentally friendly. One of the advantages is that it is biodegradable which are able to decompose in nature and does not leave residues that are harmful to the environment until now it has been developed in combination with various types of polymer matrices so that it can produce composites that have good strength. In this study, composites made from palm frond fiber (Elaeis guineensis Jacq) were characterized by a two-step treatment, namely alkalization using sodium hydroxide (NaOH) and the addition of a bleaching process using hydrogen peroxide (H2O2). single fiber and Weibull distribution methods, chemical properties testing including chemical composition of fiber content, FTIR, and physical property testing including diameter measurement and SEM observations. Thus, the optimal concentration of alkali and bleaching was produced in the two-step process between 5% NaOH concentration and H2O2 in terms of bonding characteristics, this was mainly due to the reduction of the amorphous part of the fiber. There was a color change after the OPFF was treated with NaOH and H2O2 where the color of the OPFF became brighter. The heat resistance value is inversely proportional to the thickness value after alkaline treatment. heat resistance increased while the diameter of the OPFF decreased with increasing concentration of NaOH and the addition of the second treatment H2O2. The best crystallinity index was obtained at 10% NaOH variation and the best cellulose content was obtained at 5% NaOH variation. Likewise, the tensile strength of TF without treatment experienced a significant increase (76%) with 5% NaOH - H2O2 treatment. The results of the FTIR (Fourier-transform Infrared Spectroscopy) test confirmed that the alkaline treatment and bleaching removed the hemicellulose content, impurities, and excessive water absorption. The surface of the treated OPFF becomes rougher. The etched surface shows interlocking with the matrix as shown in the SEM images. The effect of NaOH and H2O2 treatment on OPFF shows the potential of OPFF as a reinforcement for matrix polymer composites to reduce the use of synthetic fibers.
DEVELOPMENT OF LOW-HEAD CROSSFLOW TURBINE PICOHYDRO POWER PLANTS Gunandi, Gun Gun Ramdlan; Widiawaty , Candra Damis; Subarkah, Rahmat; Abadi, Cecep Slamet; Nufus, Tatun Hayatun; Rizkia , Vika
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1718

Abstract

The provision of food, the provision of energy and the provision of information are controlled to improve people's welfare. In 2011, national electricity production by PLN was 11% new and renewable energy. 6% PLTA and 5% PLTP. PLN plans Geothermal Energy to be 13% and Hydro Power Plant still 6%. The availability of PhHPP independently has been developed by many communities. PhHPP with a water wheel drive capacity of around 100 watts, just enough for home lighting. Even though the area's hydro energy potential is quite abundant. The developments that have been carried out have several weaknesses; The PhHPP with a plump turbine type requires a high head, which becomes an obstacle for agricultural irrigation, while PhHPP with a water wheel type has low efficiency. Research was conducted to develop PhHPP with a more efficient low head crossflow turbine type. Development of PhHPP with cross flow turbine type with actual energy potential, head 2 m and flow velocity 1 m/s. Development begins with numerical simulations to optimize the runner width and diameter ratio. Simulation results of the RNG k-ε model for a total inlet pressure of 20114 pascals and an outlet of 0 pascals, the optimum point is at the crossflow turbine runner diameter and turbine width ratio of 0.56.
DESIGN OF A SINGLE-STAGE AXIAL POWER TURBINE IN AN ULTRA-MICRO GAS TURBINE ENGINE Solissa, Rizal Gidion; Hartono, Firman; Al Gifar, Muhamad Maris
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1763

Abstract

Today's electrical energy needs require several alternative power and electrical energy storage. One system that can be developed to meet these needs is an ultra-micro gas turbine. The single-stage axial power turbine is designed to drive a 182.574 KV BLDC electric motor generator with 50% efficiency at 10000 rpm which will produce 600 watts of power with a turbine diameter of 10-20 cm. The utilization is based on the exhaust gas from the turbine on the GT2052 turbocharger which has an efficiency value of 70%. The design is done by free fortex analytical method and gas flow simulation using computational fluid dynamic Ansys CFX. To be able to produce the target power for the BLDC electric motor, the single-stage axial power turbine designed with CFD simulation produces a power of 1830.59 watts with an air mass flow of 0.166 kg/s, a pressure ratio of 1.06, an efficiency of 80.7%.
STRUCTURAL ANALYSIS OF THE PASSENGER NT-60 BOGIE WAGON BOGIE TYPE Yusron, Rifky; Bisono, Rahayu; Aziz R , M. Shafwallah Al.; Arifin , Agus Choirul
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1806

Abstract

The welded bogie railway was typically exposed to very intricate fatigue loads, resulting in a significant risk of failure. However, most standards only took into account external excitations from wheel-rail system when evaluating fatigue performance. NT-60 was a common bogie train fleet in Indonesia because it manufactured in the only company then supply to the largest train operator in Indonesia. The 2x3 general linear model factorial was applied as design of experiment, load tests and static test was set as independent variable, each loading had three levels: 18, 19, and 20 tons was conducted in three replications. Strain of bogie were detected using strain gauge type LY-11 and stress using linear variable displacement transducer, all set on load test bogie tester machine. This research focuses on knowing the load type and load variables bogie to displaying which variables affect the stress on the bogie, whereas previous research only focused on the stress results caused by the load. Factorial design of experiments provided a detailed characterization of strain and stress under varying load conditions, delivering an accurate and systematic approach to show relationship between stress and strain. The lowest average strain of 0.02 mm occurred in vertical load test with a loading of 18 tonnes at first replication. In this combination, there was also a stress of 7 N/mm². The highest strain experienced by NT-60 bogie was 0.21 mm in the horizontal load with a loading of 20 tonnes at first replication. In this condition, a stress of 44.1 N/mm² occurred.
ANALYSIS OF THE EFFECT OF WATER SALINITY ON THE IMPRESSED CURRENT CATHODIC PROTECTION PHOTOVOLTAIC (ICCP PV) SYSTEM Budiarto, Untung; Samuel, Samuel; Yunior, Tri Rangga; Frestiqauli, Santi; Ahmad, Syaiful Tambah Putra
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1818

Abstract

Cathodic protection is one of the methods used to protect metals from corrosion. This corrosion can occur due to the influence of the surrounding environment, such as salinity levels. ICCP PV is a cathodic protection method by flows direct electric current from the conversion of solar radiation. The purpose of this study is to determine the effect of water salinity on the capacity of PV components in the ICCP system. The type of material used in this research is SS 400 steel with salinity variations of 0‰, 30‰, and 35‰. The tests carried out are salinity test and load power test by considering metal potential. The experimental results show that 35‰ salinity ICCP requires the highest power of 13.09 watts. Calculation of PV component capacity at 35‰ salinity ICCP requires the largest capacity, which is 170 Wp PV module and 75 Ah battery for 14.68 m² plate area. Based on this, it is concluded that the higher the salinity of water, the greater the power required for the ICCP system, thus affecting the capacity of PV components for the ICCP system.
ANALYSIS OF SPARE PARTS REQUIREMENTS BASED ON THE FAILURE RATE OF A COMPONENT USING THE POISSON PROCESS METHOD IN A CASE STUDY AT PT. XYZ Tamitakarza, Herdi; Ferryanto, Ferryanto; Suweca, I Wayan
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1849

Abstract

This study presents the conclusions drawn from previous data analysis, highlighting several significant key findings. Firstly, an evaluation using a risk matrix revealed that the critical subsystem for the CC 206 Locomotive is the Diesel subsystem, which consists of four important spare part components: The respective MTTF values for the Injector Nozzle, Inverter, Seal Output, and Retainer are 29.292 hours, 18.943,1 hours, 13.442,1 hours, and 26.318,1 hours. Furthermore, the annual requirements for these components were calculated using a Poisson process based on their respective MTTF values. These findings provide valuable insights into the importance of these components and their annual requirements, which in turn will significantly contribute to the efficient maintenance and operation of the CC 206 locomotive. It is estimated that the annual requirements for these components are 21 units for the injector nozzle, 31 units for the inverter, 42 units for the seal output, and 23 units for the retainer. This study proposes a novel application of the Poisson process to estimate the annual requirement of spare parts based on actual component failure rates and their corresponding MTTF. The method offers the advantage of being data-driven, probabilistic, and suitable for systems with constant failure rates, making it highly effective for optimizing inventory levels in railway maintenance. This research provides a new insight into quantitative spare part planning that improves reliability-based inventory strategies in Indonesian railway operations.
RELIABILITY EVALUATION OF OVERHEAD POWER TRANSMISSION SYSTEMS TO SUPPORT ELECTRIC RAILWAY OPERATIONS IN THE JABODETABEK AREA Prasetiyo, Edwin Rozzaq; Virdyawan, Vani; Rachmildha, Tri Desmana
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1851

Abstract

Overhead catenary system (OCS) is a vital infrastructure for the operation of electric railway trains as it delivers electrical power from the traction substation to the train pantograph. Increasing train trips in urban areas imposes additional mechanical and electrical loads on OCS components, thus demanding more frequent and accurate maintenance. This study introduces a risk-based reliability evaluation approach for critical OCS components by integrating risk matrix analysis with Anderson-Darling distribution fitting for failure and repair data. The methodology enables precise reliability and availability assessment of each component, comparing results to the operational targets. Findings show that contact wire, messenger wire, and hanger have reliability values below the company’s standard, whereas feeder wire and transmission poles exceed the targets. The proposed approach provides a data-driven framework to support condition-based maintenance planning and improve system readiness.
THE EFFECT OF AIR FLOW RATE ON THE CHARACTERISTICS OF PULVERIZED CATALYTIC COMBUSTION OF RICE HUSK WASTE BIOMASS Hamidi, Nurkholis; Yuliati, Lilis; Purnami; Maulana , Syahrizal
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.1856

Abstract

The purpose of this study was to determine the effect of airflow rate on the characteristics of catalytic combustion of pulverized rice husk biomass. Natural zeolite was used as the catalyst in this study. The combustion characteristics included the value of Initiation Temperature of Volatile Matter (ITVM), Initiation Temperature of Fixed Carbon (ITFC), peak of weight loss rate temperature (PT), Burning out Temperature (BT), mass reduction graph (TGA), mass reduction rate (DTG), heating value, and activation energy were measured. The sample used was 45-200 µm in size, and the percentage of catalyst was 7%. The research was carried out using 4 variations, including 2.9 ml/min, 5.8 ml/min, 9.0 ml/min, and 14.8 ml/min, each of which contains the same air composition, namely 80% nitrogen and 20% oxygen. The results showed that the greater the airflow contained in the pulverized biomass catalytic combustion process could increase the combustion characteristics including reducing the value of ITFC, PT, and BT. In addition, it also accelerates the rate of mass reduction and decreases its activation energy due to increasing pressure along with increasing temperature in the combustion chamber, besides that excess air also causes the combustion that occurs in more perfect combustion.

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