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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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ANALISIS EKSPERIMENTAL PERPINDAHAN PANAS PADA MENARA PENDINGIN TIPE PLAT DATAR BERTINGKAT Aulia, Fikri; Ahmad Syuhada; Razali, Razali
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.v15i3.1821

Abstract

Cooling towers serve as an important tool in industrial settings to reduce heat in machines that use water and air as working media, this process involves hot water generated from the machine coming into direct contact with air resulting in a small portion of the water evaporating which then reduces its temperature. Although previous research has attempted to improve the performance of cooling towers, there is still considerable scope for further exploration in achieving optimal results. One way to improve it is to adjust and change the flow of distributing fluid media by adding the number of holes on the flat plate of the cooling tower. Based on this phenomenon, the researcher wants to examine the magnitude of the heat transfer impact on a multi-storey cooling tower using triangular perforated flat plates with varying numbers of holes. The overall height of the cooling tower is 2.4 meters, consisting of five flat plates arranged in stages with each flat plate dimension having a length of 0.7 meters and a width of 0.5 meters, having a plate area of 3.5 m² with a tilt angle of each plate arrangement on the cooling tower which is 15 °. The number of holes in a given flat plate is 45, 55, and 65 holes, while the inlet water temperature is set at 80°C, 85°C, and 90°C. The results of this study revealed that the number of holes 65 showed a greater heat transfer effect compared to the other variations. Consequently, the number of holes significantly affects the heat transfer coefficient, thus impacting the overall performance of the multistage cooling tower.
ANALYSIS OF WORK ACCIDENTS DURING THE PLUMBING INSTALLATION PROCESS USING THE FAULT TREE ANALYSIS METHOD Bastuti, Sofian; Alfatiyah, Rini
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.v15i3.1823

Abstract

The plumbing installation process often harbors potential risks that can lead to workplace accidents. Considering the serious consequences of workplace accidents both in terms of health and economy, there are six types of workplace accidents in the plumbing installation process: foot crushed by a pipe, hand cut by a cutting tool blade, eyes exposed to welding smoke, burnt by hot welding slag, sparked by friction between iron and a cutting blade, and leg scratched by the edge of a pipe. This study aims to analyze workplace accident incidents during the plumbing installation process using the Fault Tree Analysis (FTA) method with the hope of identifying the root causes of the accidents and formulating recommendations to improve work safety. The FTA method allows for the development of a systematic model that illustrates the cause-and-effect relationships of system failures and their components. The primary advantage of using FTA is its ability to provide a comprehensive understanding of complex accident scenarios by breaking them down into simpler basic events. The novelty of this research lies in its application of FTA specifically to the plumbing installation process, which has not been extensively explored in previous studies. The results identified that the cause of eyes exposed to welding fumes led to 11 basic events, while the mocus analysis revealed 7 basic events with 11 failure combinations.
STUDI KARAKTERISTIK BRIKET ARANG BIOMASSA BERBASIS SCREW PRESS Dahlan, Masbin; Sulfiana, Enni; purna yudha, sabdha; Amaluddin, Muh. Nurul Haq
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.v15i3.1824

Abstract

Biomass is material originating from plants that can be used as a source of energy, fuel, or a substitute for products and materials originating from fossils. One of the raw materials for biomass briquettes, an energy alternative, is coconut shells. To increase briquette production and simplify the process, briquette-making machine tools or technology are needed that can be used for large-quantity production. This research aims to design and build a biomass charcoal briquette densification machine using the Screw Press system, as well as test the performance of the densification machine in making biomass charcoal briquettes from coconut shells using tapioca adhesive and kapok leaf extract. The motor power required for the charcoal briquette densification machine is 2.33 PK. This densification machine is capable of producing charcoal briquettes weighing 11,115 grams per minute or 667 kg per hour with a rotation speed of 350 rpm. The average performance efficiency of the densification machine reached 98.33%. The average density of briquettes using tapioca flour adhesive is 0.9941 g/cm3, while for briquettes using kapok leaf extract, it is 0.9579 g/cm3. The drop test results showed an average value of 0.1133% for each type of briquette. The average briquette compression test values were 2.6133 N/mm2 and 2.0733 N/mm2, while the average ash content was 2.94% and 3.20%. The average burning rate of briquettes is 0.1112 g/minute and 0.1273 g/minute for each type of briquette.
INVESTIGASI LAJU REGANGAN CREEP BAJA TAHAN KARAT FERRITIC PADA TEMPERATUR 570 °C Ekaputra, I Made Wicaksana
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.v15i3.1848

Abstract

The probabilistic assessment of failure due to the creep phenomenon must be determined with the minimum deviation. Since the creep failure took years before rupture, laboratory experiments were conducted to represent the failure time. However, the laboratory results are only an empirical approach; therefore, the probabilistic assessment can be deviated. A huge number of variables in creep experiments must be conducted to minimize the deviation. This study investigated the creep strain rate for the 9Cr-1Mo ferritic stainless steel. The lever-arm creep machine was used for the creep rupture test, and the test followed the standard of ASTM E139. The constant loads were applied in the range of 250 – 170 MPa with the homologous temperature of 570 °C. The curve of strain to time was recorded from each constant load condition. The creep strain rate was then calculated and presented in the curve of the creep strain rate to the applied load. The linear regression was drawn from the curve by applying Norton’s equation. By obtaining the creep strain hardening coefficient and exponent, an initial probabilistic assessment of creep failure at a temperature of 570 °C can be predicted.  
EXPERIMENTAL STUDY OF COOLING FLUID VARIATION ON THE THERMOELECTRIC HOT SIDE ON THERMOELECTRIC VACCINE COOLER BOX PERFORMANCE Pratama, Novreza; Rosyadi, Imron; Wahyudi, Hadi; Fasya, M. Haykal
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.v15i3.1850

Abstract

The advanced countries make health a high priority and collaborate to create a better quality of life. Vaccination is a critical component of global health. Vaccines must be stored at a constant temperature of 2-8℃, to maintain the viability of the vaccine cold chain. Thermoelectric cooling systems (TECs) are a solution that is simple, lightweight, low cost, and portable. Excessively high hot-side temperatures can be detrimental to operators and the environment during distribution processes. The application of fans and circulating fluid can reduce the TEC hot-side temperature. The lowest TEC temperature difference of 30.26℃ is achieved by using only a fan. The minimum hot side of 31.28℃ is achieved with the fan and circulating water model. The minimum cold side can be increased to 0.53℃ with the fan and circulating radiator coolant model. All tests were at vaccine-eligible temperatures. The best COP of 0.14 can be reached in this study.
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.
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.
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.
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.

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