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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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FAILURE MODES AND EFFECTS ANALYSIS (FMEA) ON TRACK INFRASTRUCTURE INTEGRITY ASSESSMENT Angga Ahmad Maulana; Puja , IGN Wiratmaja; Wicaksono, Satrio
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1855

Abstract

Track infrastructure plays an important role in the railway business, where the safety of rail travel is determined by the integrity that exists in each component of the railway track. In this paper, an integrity assessment of track infrastructure is carried out using the Failure Modes and Effects Analysis (FMEA) method by identifying various failure modes for each component and track geometry that have existed in the field. Then a survey was conducted to track maintenance experts at PT Kereta Api Indonesia (Persero) to get the value of severity, occurrence, detection, and recommended actions taken. Based on the analysis, the failure mode with the highest Risk Priority Number (RPN) is the cracked rail on the welding/fish plate joint with a value of 280, while the failure mode with the lowest RPN is the loose rail with a value of 108. Then 21 failure modes fall into the "unacceptable" risk level, 4 failure modes fall into the "tolerable" risk level, and 1 failure mode falls into the "acceptable" risk level. From the results of this assessment, it is expected to help in prioritizing the risk of failure, so that the maintenance strategy can be planned properly, and the safety of train travel can be maintained.
TECHNO-ECONOMIC ANALYSIS OF BOILER WASTE HEAT-BASED BIOMASS DRYING SYSTEM OF A COAL COFIRING POWER PLANT Baisir, Mahpudi; Surjosatyo, Adi; Dafiqurrohman, Hafif
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1858

Abstract

This research aims to find the optimal operating pattern in a rotary dryer type biomass drying system with the heating medium from exhaust gas leaving the boiler. This heating medium is believed to provide high profits because it does not require additional energy. However, the lowest moisture may not necessarily provide maximum investment profits due to trade-offs with capital and operational costs. The research results show that the test point at a biomass inlet flow of 10 t/h, a residence time of 25 minutes, and an exhaust gas flow of 90 t/h can optimally obtain the highest three investment parameters, including USD 8,518,085.33 for NPV, 150.32% for IRR, and 0.67 years for PBP. So that it succeeds in reducing the biomass moisture from 44.57% to 10.90%. Reductions in energy output and operational duration should be avoided wherever possible because they have a significant impact on reducing profit.
ANALISIS RELIABILITY KOMPONEN STASIUN PENGISIAN KENDARAAN LISTRIK UMUM (SPKLU) DENGAN METODE FAILURE MODE AND EFFECT ANALYSIS (FMEA) Setiawan, Falih; Haryadi , Gunawan Dwi; Prahasto, Toni; Widodo , Achmad
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1862

Abstract

Air pollution remains a critical issue that requires prompt and effective resolution. One of the primary strategies to mitigate this problem is the promotion of electric vehicle (EV) usage. However, several challenges persist, including high initial investment costs, inadequate charging infrastructure, and long charging durations. This study aims to analyze the reliability of Public Electric Vehicle Charging Stations (SPKLU) using the Failure Mode and Effect Analysis (FMEA) method. The strength of the FMEA approach lies in its ability to identify potential failure risks, prioritize corrective actions based on the Risk Priority Number (RPN), and provide recommendations for improving the reliability of SPKLU systems. This method enables the reduction of system downtime and maintenance costs. The results reveal that major causes of SPKLU system failures include short circuits, overheating, and inadequate maintenance. The reliability values obtained were 67.36% for the charging sub-system, 36.78% for the control sub-system, and 50% for the overall system. This research offers practical contributions to the development of more reliable and sustainable electric vehicle infrastructure.
ANALISIS JARAK GRID HARDFACING TERHADAP NILAI KEKUATAN BENDING PADA MATERIAL ASTM A36: Hardfacing Awali, Jatmoko; Dewanto, Hizkia Alpha; Ismail , Andi Idhil
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1869

Abstract

Welding is the joining of metals in liquid form using heat energy in making products in the process of joining materials such as in the automotive sector. The development of welding has reached the additive manufacturing process, one of which is hardfacing, namely the thickening of a component that already exists in the industrial sector. In the automotive sector, many people use ASTM A36 or mild steel, namely carbon steel, for standard specifications for structural applications. Hardfacing is a process with an angle welding approach and the resulting structure has a direct relationship with the welding parameters and material characteristics during welding. Adding corner welding grids to increase the strength value of special mechanical properties such as car bodies. This research aims to determine the effect of the shape of the welding grid on the mechanical properties of GMAW welding using ER70S-6 electrodes and a welding current of 80 Ampere with variations in the weld metal spacing, namely 5 mm, 10 mm, 15 mm, and with ASTM A 36 material with a thickness of 2 mm. GMAW welding uses constant current by varying the hardfacing grid. From the research results it is known that the largest stiffness value is found at a variation of the weld metal distance of 10 mm with an average value of 1737.5 N. In the microstructure the phase formed is ferrite (F) and along the grain boundaries pearlite (P) is formed.
GEOMETRIC DESIGN OF CROWN WORM GEAR WITH STRAIGHT-LINED BLADE PROFILE Andrianto, Moeso; Litaay, Christina; Harun, Suryadiwansa; Burhanuddin, Yanuar; Arifin, Achmad
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1874

Abstract

Applications for worm gear drives are common in industry. The crown worm drive is a new kind of inventive worm drive that has just been proposed. Nevertheless, no prior research has been done on the geometric design of crown worm gears with straight-lined blade profiles. On the other hand, designing the cutting tool depends on the geometric design of the workpiece surface modeling. As a result, this study proposed a geometric design for the straight-lined blade shape of the crown worm gear. Numerical examples are used to evaluate the accuracy and applicability of the suggested mathematical model. Furthermore, the modeling of a variable center-distance crown worm gear is completed. It is also feasible to model the crown worm gear using different tool profiles, such as concave and convex profiles.
EVALUATION OF GEOMETRIC ERROR OF CUSTOMIZED CNC MILLING MACHINE TOOLS ACCORDING TO ISO 10791-7 Prayoga, Benidiktus Tulung; Hendaryanto, Ignatius Aris; Winarno, Agustinus
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1878

Abstract

Due to open technology, there exists an abundance of inexpensive information accessible for study. One such piece of information pertains to customization or do-it-yourself (DIY) CNC milling machines. However, customized milling machines often suffer from several limitations, including a lack of component dimension accuracy, inappropriate interaction between components, low rigidity, and control system problems, all of which can impact the cutting performance and accuracy of the workpieces. This study aimed to measure the extent of these impacts on the accuracy of the workpieces. The errors in customized CNC milling machines were identified using a ball-bar system and cutting tests conducted according to ISO standards. The results of this study concluded that improvements must be made to the interaction between machine components to reduce geometric errors to levels acceptable according to standards. This customized CNC milling shows promise for machining workpieces with an accuracy of ± 0.2 mm.
DEVELOPMENT OF LOCOMOTIVE CC 203 MAINTENANCE STRATEGY USING RISK-BASED RELIABILITY CENTERED MAINTENANCE (RCM 3) METHOD Arfiansyah, Oky; Wiratmaja, I Gusti Nyoman
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1882

Abstract

Trains play a vital role in Indonesia's transportation system as they help reduce exhaust emissions and are one of the most environmentally friendly modes of transportation. PT Kereta Api Indonesia (PT KAI) as the largest train operator in Indonesia has an important role in providing reliable and efficient train services. This research analyzes the maintenance strategy applied to locomotive CC 203 and provides recommendations to improve reliability and maintenance cost efficiency using the Risk-Based Reliability Centered Maintenance (RCM 3) method. The RCM analysis results show that by changing the maintenance interval from P24 to P12, P24, and P48 the reliability of the diesel engine system can be improved from 66,3% to 80,2%. In addition, the risk of failure mode occurrence decreases. Although the cost of the proposed maintenance increases, the benefits obtained are much greater including increased system reliability, decreased risk, and potential reduction in corrective maintenance costs. Therefore, this new maintenance recommendation is expected to assist PT KAI in maintaining reliable and efficient operations, as well as anticipating the risks associated with corrective maintenance costs.
RISK ASSESSMENT OF GAS PIPELINE CROSSING UNDER RAILWAY TRACKS AND DENSE RESIDENTIAL AREAS Nurdiansyah, Angga; Puja , IGN Wiratmaja; Kariem, M Agus
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1885

Abstract

The crossing of Gas pipelines with railways is part of the energy transportation infrastructure that requires special attention, both to the operational safety of the pipeline and the railway line itself. Therefore, stakeholders need to conduct a risk assessment of each pipeline and railroad crossing to ensure that the risks are within safe and tolerable limits. This study aims to assess the risk at a gas pipeline crossing with a railway line in Central Java Province, Indonesia, using a quantitative risk assessment (QRA) approach with reference from the BS 8010-3:2009 +A1 2013 standard. The assessment results at the crossing showed an individual risk of 3,35x10-8/year and a societal risk in the ALARP Zone. The proposed risk mitigation can reduce the individual risk from 3,35x10-8/year to 1,12x10-8/year. However, although the risk mitigation can reduce the individual risk at the crossing location, the societal risk is still in the ALARP Region. Therefore, the crossing between the gas pipeline and the railway needs the attention, both pipeline operators and railway companies, to ensure the operational safety and security of both parties.
EFFECT OF DRILLING PARAMETERS ON THRUST FORCE AND DELAMINATION DAMAGE OF DRILLED RAMIE WOVEN – COIR FIBER HYBRID COMPOSITES Chandrabakty, Sri; Fadly, Muhammad Syaiful; Nilasari, Sri
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1890

Abstract

This study examines the effect of spindle speed and feed rate variations on the delamination mechanism and thrust force of hybrid composite materials reinforced with ramie weave and coir fibers. The specimen was made with a volume fraction of 30%, consisting of 6 layers of woven ramie, with the remainder being coir. The drilling process is divided into four main phases, showing changes in thrust force at each stage. The results indicate that an increase in feed rate tends to increase thrust force and cause microstructural damage such as delamination and fiber pull-out. At a feed rate of 0.26 mm/rev and a spindle speed of 1500 RPM, the maximum thrust force is reached, indicating the most severe damage. The delamination factor is higher on the exit side compared to the entry side, especially at higher spindle speeds. Tensile tests show a significant decrease in the tensile strength of the composite material due to drilling, with the highest tensile stress achieved at a spindle speed of 1500 RPM and a feed rate of 0.1 mm/rev, although still lower than the sample without holes. The combination of high feed rate and high spindle speed increases the risk of material damage, but the proper selection of drilling parameters can help minimize damage and maintain the mechanical integrity of the composite material. This study provides important insights for industrial applications where mechanical strength and drilling efficiency are crucial.
OPTIMIZATION OF TENSILE STRENGTH OF EMPTY OIL PALM FRUIT BUNCH FIBER REINFORCED COMPOSITES USING GENETIC ALGORITHMS Rahim, Abdul; Mujianto, Agus; Feriyanto, Richie; Waloyo, Hery Tri
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1898

Abstract

The use of natural materials such as oil palm empty fruit bunch fibers can provide a solution to increase value-added and manage plantation waste. Fibers are combined with a matrix to create composite materials. Instead of glass fibers, environmentally friendly natural fibers serve as the reinforcement in the composite material. Implementing natural fiber composites must consider the primary construction requirement, which is tensile strength. Artificial intelligence like genetic algorithms (GA) can simplify and reduce costs in the search for optimal values in composite material engineering. Data is obtained through experimental testing prepared samples and subsequently used as input for GA. The input parameters consist of three variables such as soaking time, volume fraction, and fiber length. The output of the optimization process is tensile strength. The maximum tensile strength has already been achieved with genetic crossover by the 125th generation. Based on GA calculations, the optimal parameters obtained are soaking time of 6.2 hours, volume fraction of 29.6%, and fiber length of 6.9 cm. The predicted optimal tensile strength value is 4.78 MPa.

Page 93 of 97 | Total Record : 965

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