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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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Search results for , issue "Vol. 15 No. 2 (2024)" : 100 Documents clear
PENGARUH SILIKA TERHADAP KARAKTERISTIK FILM LATEKS KARET ALAM DALAM PENGAPLIKASIAN BLADDER COMPRESSION MOULDING Pranata, M. Sagitra; Nugroho, G.; Indrajati, Ihda Novia; Dewi, Indiah Ratna
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1696

Abstract

The objective of this study is to investigate the production and analysis of bladders made from natural rubber latex using the dipping technique, with the aim of identifying the optimal formulation for determining their mechanical properties. The procedure was executed by a series of sequential steps, including dispersion, compaction, and vulcanization. Bladder compression molding was conducted using a range of five samples of SiO2, with varying proportions of 2, 4, 6, 8, and 10 phr. The testing was conducted in accordance with ISO 37, ISO 34-1, and ISO 188 standards. The findings indicated that the optimal formula was derived from the modification including a concentration of 2 parts per hundred of SiO2. The obtained mechanical parameters consist of a tensile strength of 17,972 MPa, an elongation at break of 924 MPa, and a tear strength of 50,478 MPa. The test parameters utilized in this study were in compliance with ISO 37, ISO 34-1, and ISO 188 standards.
ANALISIS EKSPERIMENTAL PENGARUH BELOKAN TAJAM DAN SUSUNAN PIPA TERHADAP PERPINDAHAN PANAS PADA SOLAR WATER HEATER Nasution, Muhammad Syukri; Syuhada, Ahmad; Razali, Razali
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1698

Abstract

Hot water is water that has a temperature above the human body's temperature, which ranges between 37-100°C. The demand for hot water keeps increasing, especially for bathing purposes, as bathing with hot water is more comfortable and can help relax the body. Typically, hot water is obtained by boiling water using oil or wood-burning stoves and using electric water heaters, which increase household expenses. The best alternative to address this issue is to create a solar water heater. To improve the performance of a solar water heater, many researchers have conducted studies on this topic, but further improvements are still needed to achieve more optimal results. This research is conducted to test the effect of the number of sharp bends, the length of the pipe between sharp bends, and the arrangement of the pipe layout on the heat transfer that occurs in a 30 L solar water heater pipe with collector dimensions of 2.5 x 0.8 m². The variations made on the heating pipe involve varying the length of the pipe between sharp bends into three variations, namely (230, 670, 95) cm, arranged horizontally and vertically. Based on the research with an average solar radiation intensity of 790-850 W/m², the most optimal collector occurred in the variation III pipe (95 cm) with an end water temperature of 76.56°C, useful energy of 360.4333 W, solar water heater efficiency of 23.4714%, and convective heat transfer coefficient of 150.7833 W/m²K.
ANALISIS PENGARUH BENTUK LUBANG TERHADAP KARAKTERISTIK PERPINDAHAN PANAS PADA MENARA PENDINGIN TIPE PLAT DATAR BERLUBANG BERTINGKAT Mustika, Yulanda Dwi; Syuhada, Ahmad; Razali , Razali
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1699

Abstract

Cooling tower is one of the most widely used cooling systems in the industrial world. A cooling tower is a series of heat exchange devices that use working fluids, such as water and air, to act as a cooling medium by coming into direct contact with the air, causing a small portion of the water to evaporate and reducing the temperature of the liquid. To enhance the performance of cooling towers, many researchers have conducted studies on this matter, but there is still room for improvement to achieve more optimal results. The objective of this research is to obtain an optimal cooling tower system by determining the convective heat transfer coefficient. With this phenomenon, the research investigates the heat transfer process that occurs on perforated plates in a flat plate-type cooling tower with an overall tower height of approximately 2.4 meters and around 5 levels of fluid distribution media. The length of each plate is 0.7 meters with a width of 0.5 meters. Variations are also made in the multi-level cooling tower design, specifically in the shape of the perforations used, including circular, triangular, and square perforation shapes, using a zig-zag outlet hole model. The perforated plate area is 0.0157 square meters for each plate, with a 15° inclination angle for each plate arrangement. The research results indicate that the highest heat transfer coefficient values occur in the multi-level cooling tower when using square-shaped plates, followed by triangular-shaped plates, while circular-shaped plates have the lowest heat transfer coefficient values. Therefore, variations in the shape of the perforations on the flat plates affect the change in temperature reduction and the heat transfer coefficient values in the performance of the multi-level cooling tower.
EFFECT OF DIAMETER BEARING MOUNTS TO STRESS CONCENTRATION FACTOR ON TRUCK GEARBOX CASING Siregar, Rakhmad Arief; Siahaan, Muhammad Yusuf Rahmansyah; Rizal, Mahmud
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1702

Abstract

The present study examines the effect of diameter bearing mounts to the stress concentration factor. Three commercial truck gearbox casings were selected for redrawing using CATIA. The gearbox casing is then converted into a FEM model in ANSYS. It has a bore ratio (the ratio of the largest diameter to the smallest diameter of the bearing diameter) of 1.8, 1.5 and 1.4. By applying pressure to the upper gearbox casing for static and dynamic conditions, the total deformation response and equivalent stress are investigated. The deformations and equivalent stresses on the three models of gearbox were determined and discussed. It was found that the bore ratio of the gearbox showed significant differences in results on deformations and equivalent stress. Based on the equivalent stress data of view A, which is the side of the gearbox casing connected to the engine, the stress concentration factor results are consistent with the bore ratio.
ANALISIS PENGARUH PERBEDAAN SURFACE PREPARATION DENGAN VARIASI JENIS CAT TERHADAP KEKUATAN ADHESI DAN KETAHANAN IMPACT COATING PADA BAJA SS400 Sativa , Zahra; Manik , Parlindungan Manik; Mursid , Ocid
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1711

Abstract

Surface preparation is a fundamental thing that must be done before applying the coating to the material. A good painting will be obtained with good surface preparation treatment. This research aims to determine the effect of different surface preparation methods and various types of paint on adhesion strength and impact coating resistance. The type of material used in this research is SS400 steel with three different surface preparation methods, namely sandblasting, power tools, and hand tools following ISO 8501-1 standards, and with a variety of three different types of paint, namely epoxy, polyurethane, and alkyd paint. Adhesion strength testing uses the pull-off test method and impact resistance testing is carried out using the impact coating test. This test is carried out after the coating has been applied and the paint has dried completely. The results of the tests that have been carried out show that the highest average adhesion value of the three surface preparation methods carried out is obtained from polyurethane coatings. The best coating durability test results were obtained by polyurethane paint with only cracks occurring using the hand tool method at a height of 0.6 m. The conclusion obtained is that the best type of coating in this research is polyurethane coating and the best method is cleaning using the sandblasting method.
STUDI PENGARUH PERLAKUAN ALKALI TERHADAP SIFAT MEKANIK DAN MORFOLOGI KOMPOSIT SERAT PELEPAH KELAPA SAWIT BERMATRIK UREA FORMALDEHIDA Istana, Budi; Utami, Lega Putri
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1725

Abstract

Palm frond residue is one of the valuable wastes from palm oil plantations. This refuse can be repurposed and transformed into materials for producing acoustic composites. This study investigates the mechanical and morphology characteristics of a composite material reinforced with natural fiber palm fronds and a urea-formaldehyde (UF) as a matrix. Two parameters are formulated: the effect of alkali treatment on the fiber and the effect of density. The treatment parameter refers to the particles without treatment, 60 and 180 minutes of 2% alkaline immersion. Composite densities were determined with 0.4, 0.5, and 0.6 g/cm3. The composite was made using hot pressed at a pressure of 1.8 MPa, a temperature of 140OC for 5 minutes with 10% Urea Formaldehyde resin. Alkaline treatment and density of composite have a significant effect on mechanical and morphological characteristics. The best mechanical characteristics were obtained from panels with a 0.6 g/cm3 density, without treatment, MOE: 533.53 N/mm2. The results of this study have the potential to lead to the use of sustainable palm oil waste materials in novel products, which has a significant impact and great relevance not only from environmental aspects but also from social and economic aspects in Indonesia.
RANCANGAN SISTEM HIDROLIK PADA FRONT ATTACHMENT ALAT PERAGA MINI EXCAVATOR Purwanto , Sigit; Aisyah , Nyayu; Prihadianto, Braam Delfian; Krisnaputra , Radhian; Wismo , F. Eko; Bahiuddin , Irfan
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1729

Abstract

As one of the heavy equipment, an excavator is used to facilitate construction work and streamline time and energy. Hydraulic excavators are widely used in construction, mining, quarrying, and forestry applications. A hydraulic excavator is a type of heavy equipment that has several functions such as digging, loading, lifting, scraping, grading, braking, etc. One of the products which is developed by the Mechanical Engineering Department of Vocational School (SV-UGM) is the Mini Excavator. Mini Excavator has a function as excavators in general. A smaller size makes it easier to operate and apply in the field are more compact and do not require a large area. This equipment is expected to be the right teaching aid in supporting the learning process of students of the Heavy Equipment Management and Maintenance Engineering Study Program in the Mechanical Engineering Department. For the learning process to be optimal, the equipment used should be optimal. Therefore, in this research, the design and construction of the Traction Drive System for Backhoe Type Hydraulic Excavators will be carried out and some testing will also be conducted to know the performance of the mini excavator
KINERJA SISTIM HIDROLIK PADA UNIT EXCAVATOR 320D2 CATERPILLAR Halim , Abdul; Fadli , Ma’arif; Mangkona , Mangkona
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1756

Abstract

Almost most heavy equipment units use a hydraulic system, including systems that are important for heavy equipment units to work. The hydraulic performance test on the excavator unit is part of the test carried out as an operational standard to state that the unit is good to run or operate in work in the field. So to know that the unit has good availability, it is necessary to carry out regular testing according to service guidelines. This research aims to provide information regarding standard operational procedures for testing hydraulic excavator performance, both cycle time and pressure on directional control valves. The method used is to carry out tests on hydraulic implements using a combination of system information services. In experimental testing, the cycle time for the movement of hydraulic implements, including boom, bucket, stick, swing, and travel, still complies with standard specifications. For testing, pilot relief valve pressure, main relief valve pressure, and swing pressure are all still within normal standard limits.
MEL-FREQUENCY CEPSTRAL COEFFICIENTS (MFCC) FEATURE FOR PUMP ANOMALY DETECTION IN NOISY ENVIRONMENTS Vinaya, Anindita Adikaputri; Aciandra , Tiffani Febiola
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1815

Abstract

The continuity of a production process is supported by the availability of good assets. One of the efforts to support asset availability is through asset maintenance. One of the important assets in the industry is the pump. To detect anomalous conditions in the pump, the sound of the engine can be used. However, noisy environmental conditions can change the characteristics of the sound produced. This can have an impact on errors in identifying the condition of the machine. In this study, Mel Frequency Cepstral Coefficients (MFCC) is used, because the characteristics of MFCC are very attached to the sound signal and are appropriate for sound signals in the case of this noisy environment where the signal tends to be non-stationary. Support Vector Machine will be used as a method that maps input (machine features) and output (machine condition). In this study, a comparison of the use of combined features of time and frequency domains with time-frequency features (MFCC) will be carried out. Improved performance is obtained when the time-frequency domain acoustic feature in the form of MFCC is used with an average accuracy reaching 99.88% on the Medium Gaussian SVM model.
DYNAMIC ANALYSIS OF NON-PNEUMATIC TIRES WITH HONEYCOMB SPOKES ON SPEED BUMPS Sriwijaya, Rachmat; Ghiffari , Fakhri; Ra’if , Zahran; Wijaya, Burhani
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1832

Abstract

The Non-Pneumatic Tire (NPT) has rapidly developed as an alternative to the Pneumatic Tire since it was created by Michelin in 2005. This research aims to investigate the influence of load and speed on the stress experienced by honeycomb-structured spokes of NPT tires when passing over speed bumps and the behavior of stress distribution in honeycomb spokes. Using the ANSYS Explicit Dynamics module, the chosen simulation method is the finite element method with transient dynamics. Several simulations were conducted by varying the load and initial speed of the NPT. The results of this study indicate that the higher the initial speed of the NPT, the higher the stress experienced by the spokes. Conversely, for all examined speeds, load variations do not significantly impact the stress level in the spokes. Further study on the behavior of NPT tires on inclined roads was also conducted.

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