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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 30 Documents
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Search results for , issue "Vol. 14 No. 2 (2023)" : 30 Documents clear
PENINGKATAN KETERSEDIAAN FISIK DAN WAKTU RATA-RATA ANTARA KEGAGALAN UNIT KOMATSU PC2000-8 PADA PT. UNITED TRACTORS, TBK DENGAN METODE FMEA Rustanto Rustanto; Aditya Tirta Pratama; Anggi Febrianto; Firdaus Agung Syafutra; Willian Septianugraha; Badai Merdeka Walfitri
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1053

Abstract

The era of heavy equipment industry in Indonesia was begun   in the mid-1990s, by the first heavy equipment company, PT. United Tractors Tbk. This company have started heavy equipment sales and rental throughout Indonesia, which the well-known heavy equipment is the Hydraulic Excavator. It is used to excavate, rotate, move, load, mobilize and demobilize objects. Since the excavator was always used in the site’s daily operation, the number of failures is high, then the rate of excavator’s physical availability is below the requirement standard. The purpose of this study is to analyze the physical availability of the Komatsu Excavator Komatsu PC2000-8 by reducing the failure on the Boom Attachment by using the FMEA method. In order to obtain the optimum design and conditions as heavy machine, the analytical study was utilized for increasing physical availability on Hydraulic Excavators. According to the estimation of the analytical study, it was found that the highest physical availability of the PC2000-8 Hydraulic Excavator was at 98.4%, with the MTBF (Mean Time Before Failure) was at 269 hours.
VARIASI KONDUKTIVITAS TERMAL PADA PROSES PEMOTONGAN SS400 DENGAN MEDIA PENDINGIN DROMUS TERHADAP KEKASARAN PERMUKAAN Mastiadi Tamjidillah; Rachmat Subagyo; Rudi Siswanto; Dhonie Adetya Rachman
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1083

Abstract

Thermal conductivity is a transport phenomenon where the temperature difference causes the transfer of thermal energy from the tip of the blade to the workpiece. The value of thermal conductivity is important for good conductors of surface roughness. Thermal conductivity is influenced by several factors, such as temperature, porosity, and voids. The effect of temperature on thermal conductivity is relatively small, but the conduction increases as the temperature increases, the larger the cavity, the less good the conductivity, which causes low surface roughness. This cutting process pays attention to parameter settings such as temperature, cutting speed, type of knife, and material. Likewise, fluid mechanics and hydraulics parameters such as the velocity of the cooling medium out, the pump pressure, the nozzle cross-sectional area, and the type of cooling medium. The thermal conductivity parameter is set to get the surface roughness results that vary due to thermal changes. Using the Waterjet Cutting Machine for the cutting process of SS400 Steel with a thickness of 12 mm with dromus cooling media to reduce thermal effects and reduce conductivity. With this dromus cooling medium, it is hoped that the surface roughness will be more optimal and avoid overheating. Using the Waterjet Cutting Machine for the cutting process of SS400 Steel with a thickness of 12 mm with dromus cooling media to reduce thermal effects and reduce conductivity. With this dromus cooling medium, it is hoped that the surface roughness will be more optimal and avoid overheating. By varying the temperature between the knife tip and the workpiece, good surface roughness is obtained at variations of the stand off distance of 8, 10, 12 mm, with a dromus at temperatures T1=47, T2=39 and T3=32, fluid velocity 300m/s, and pump pressure. 50.000 psi at turbulent flow Re 4000 gets the optimum result on the surface roughness test, which is 3.47 m.
ANALISIS PENGARUH VARIASI WAKTU PERLAKUAN ALKALI TERHADAP KEKUATAN IMPACT KOMPOSIT POLYESTER YANG DIPERKUAT SERAT BAMBU Kadek Rihendra Dantes; I Nyoman Pasek Nugraha; Edi Elisa; I Putu Heri Yudistira
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1104

Abstract

This study aimed to determine the effect of alkali treatment on the impact strength and fracture pattern of bamboo fiber reinforced polyester composites. This composite consisted of polyester resin as a matrix and bamboo fiber as a filler or reinforcement. The alkaline treatment time used was 5% NaOH from 1 hour to 4 hours and to determine the microscopic image of the fracture pattern of the impact test specimen. This study used an experimental method with the dependent variable being the impact strength and microscopic images of the fracture pattern, and the independent variable was the alkali treatment time 1 hour, 2 hours, 3 hours and 4 hours. Specimens were printed using the hand lay-up method. The impact strength was known by performing consecutive tests based on ASTM D 6110-04. Based on the results of the impact test, it showed that the impact strength increased until the alkaline treatment 2 hours ago and decreased at 3 hours, and 4 hours. The highest impact strength was shown in the alkaline treatment of bamboo fiber rope 2 hours with an impact strength value of 1373.89 J/M2. The examination of the microscopic image of the fracture pattern obtained the best fracture in 2 hours alkali treatment with a brittle fracture mechanism.
ANALISIS KEKUATAN IMPACT DAN MODEL PERPATAHAN KOMPOSIT POLYESTER BERPENGUAT SERAT ALAM IJUK Kadek Rihendra Dantes; Edi Elisa; I Made Pasek Budi Susila
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1105

Abstract

The objective of this study is to find significant differences in impact forces between continuous, discontinuous, and woven fiber type of polyester composites with natural palm fibers and to find out the description of the microfracture structure. This study used experimental methods with independent and dependent variables. The independent variables are continuous, discontinuous, and woven fiber type. Then, the dependent variable was impact forces. Based on the results of tests, show that results from the average score at continuous fiber type = 1.082.88 J/m2, discontinuous = 794.67 J/m2 and woven = 1.427.06 J/m2. The conclusion of this study is that between various fiber orientations was a significant difference in impact forces. The type of woven fibers has a higher value compared to the type of continuous and discontinuous fibers. Discontinuous fiber type has a lower score than continuous fiber type. The fracture model of polyester composite with natural palm fibers showed the mechanism of brittle fracture (brittle) in all test specimens. However, in specimens with the type of continuous fibers and woven, the fracture conditions indicate a brush fracture mechanism.
PENGARUH PENAMBAHAN CACO3 DARI LIMBAH KULIT TELUR DAN WAKTU PENGADUKAN PADA PEMBUATAN ALUMINIUM FOAM MENGGUNAKAN METODE MELT ROUTE Ikhsan Ekariadi; Yeni Muriani Zulaida; Suryana Suryana
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1192

Abstract

Aluminum is a lightweight material that has good corrosion resistance and electrical conductivity. It can be used for making aluminum foam. One of the methods for making aluminum foam is the melt route method. Making aluminum foam using the melt route process, is called melting aluminum metal, adding foaming agent, and stirring. This study aims to determine the effect of adding CaCO3 from eggshells and stirring time on the foaming ability of aluminum foam. The characteristics that will be observed include the type of aluminum foam, height, pore size, density, porosity, and compressive strength. This research used the melt route method with adding variations in the mass composition of CaCO3 is 4, 5, and 6 wt% on smelted aluminum with stirring times of 30, 45, and 60 seconds. The process is carried out by heating aluminum to 760 °C and adding Al2O3 as a viscosity modifier then adding variations in the mass composition of CaCO3 and stirring with a variation of stirring time. The results show that the highest aluminum foam gets a value of 75 mm. The pore sizes of aluminum foam are obtained ranged from 0.287 to 1.109 mm. The optimal value obtained from the addition of CaCO3 with a mass composition of 4 wt% with a stirring time of 45 seconds, has a density value of 0.388 g/cm3, a porosity percentage of 85.848%, and a compressive strength of 1.777 MPa.
ANALISA PENGARUH SUHU PERLAKUAN PANAS TERHADAP PROPERTI MEKANIK KOMPOSIT AL-TIC 3% DENGAN METODE COOLING SLOPE SUDUT KEMIRINGAN 45° Farida Ariani; Diky Setiawan Hutabarat
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1206

Abstract

On the industrial side, the selection of materials for a product produced by a company must be following the function and purpose of the product. There are many types of materials used by various companies in the manufacture of a product, one of which is aluminium. This study aims to determine the effect of temperature variations of 3% Al-TiC Composite Heat Treatment 350°C, 450°C, 550°C on the mechanical properties and microstructure with the cooling slope method. The casting process is carried out using A356 aluminium material and the addition of 3% titanium carbide (TiC). The casting results are poured into a permanent mould through a cooling slope with a pouring angle of 45°. And finally carried out by heat treatment on the test object with temperature variations of 350°C, 450°C, 550°C with oil cooling media SAE 40. The highest hardness was obtained at a heat treatment temperature of 550°C with a value of 64.25 BHN, at a temperature of 450°C with a value of 60.02 BHN, and 350°C with a value of 56.59 BHN. The highest tensile strength was obtained at a heat treatment temperature of 550°C of 219,862 MPa, a temperature of 450°C of 183,273 MPa, and 350°C of 164,328 MPa. The obtained microstructure shows hypo-eutectic silicon dispersed among the aluminium. The microstructure shows that the homogenization of silicon and TiC at a heat treatment temperature of 550°C is very good, as evidenced by the uniformly dispersed density of the alloy filling the aluminium matrix.
ANALISA DISTRIBUSI KEKERASAN KOMPONEN MOVABLE PULLEY DRIVEN (MPDN) PADA TRANSMISI KENDARAAN Irwan Suriaman; Muhammad Al Makki; Jatira Jatira; Choirul Anwar
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1221

Abstract

Transmission on the vehicle is very important component to ensure maximum power transfer from the engine to the wheels. The speed of four-wheeled vehicles is influenced by the transmission system used. Pulley is the component of continuous variable transmission (CVT) which is currently widely used in the automotive industry. The CVT transmission is type of automatic transmission with  gearshift process that does not use gears, but uses pulley. The pulley is made of stainless steel. For CVT transmission there are two pulleys, both of which are called driven pulleys. The CVT transmission shift operation is controlled electronically from the computer to drive the two pulleys. These two pulleys can move to the right or to the left, respectively, so that the width of the two pulleys can change to narrow or widen. The drive pulley moves away so the belt will move inward and the same time the driven pulley will narrow so the belt will move further out. The pulley diameter becomes the gear ratio in a CVT transmission. In the CVT transmission process there will be friction between the two surfaces of the pulley and the belt, therefore it is necessary to measure the hardness of the material from the pulley to ensure the vehicle's transmission capability. In this study, the hardness of the pulley material was measured using a Vickers machine according to the ASTM 6507 standard with a given load of 0.3 kg. The measurement results obtained an average value of hardness Vickers (HV) for the pulley material of 473. 
RANCANG BANGUN DESALINASI SURYA TIPE SINGLE BASIN DOUBLE SLOPE DI SELAT PANJANG KOTA-RIAU Awaludin Martin; Benny Wahyudi; Fikri Fahlevi Nasution
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1247

Abstract

People in coastal areas must buy or use rainwater to get clean water, but the availability of clean water itself still depends on the availability of nature where when the dry season comes it is very difficult to get clean water. The solution to this problem is to utilize seawater through a seawater purification process (desalination) by removing excess salt content in the water by utilizing solar energy. The aims of this study are to design, manufacture, and test solar desalination with a single basin double slope type with the addition of an internal reflector and a wick in the form of a sponge. Where the test was carried out in Selat Panjang Kota, Meranti Islands Regency, Riau Province, Indonesia (1° North Latitude and 102.70° East Longitude). This study resulted in the highest efficiency found in the test with a sponge pore dimension of 0.20 mm compared to a sponge pore dimension of 0.35 mm and 0.50 mm. With the average intensity of solar radiation on that day of 733,079 W/m2, the desalination water produced was 3,380 kg and the efficiency was 27.05%. The quality of the desalinated water shows that all test parameters have values below the drinking water standard, which is given by the Minister of Health Regulation NUMBER 492/MENKES/PER/IV/2010. This indicates that desalinated water is suitable for drinking as well.
THERMAL CONDUCTIVITY OF PARTITION BOARD BY POLYMER COMPOSITE WITH FILLER EMPTY FRIUT BUNCHES FIBRES Batumahadi Siregar; Banu Nursanni; Sapitri Januariyansah; Sutrisno Sutrisno; Kinanti Wijaya
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1263

Abstract

Utilization and management of Empty Fruit Bunches (EFB) fibre continue to develop as the main ingredient and additional material used in various industrial products. The technological breakthrough targeted in this study is the developed EFB fibre as a filler in polymer composite partition boards which are used as heat retainers in the interior construction of buildings. The partition board is a heat insulator, and its thermal conductivity is affected by mass density and porosity. The purpose of this study was to determine the heat resistance of partition board products to reduce the heat entering the room from outside by propagating through walls exposed to direct sunlight. The test method used is adopted from ASTM C177-13, namely the measurement of heat propagation with a modification of the heat source of 40 watts. In addition, mass density tests (referring to SNI 03-2105-2006) and water absorption (referring to ASTM D5229M-12) were also carried out on the product. The specimens were based on the formation of Singapore Highpolymer Chemical Product (SHCP) 2667 WNC polyester resin matrix partition board with weight fractions of 25%, 30%, and 35% chop strand mat (CSM). The test results show that the highest thermal conductivity value is found on the board with a weight fraction of 25%, namely 0.153 W/m.°C with a mass density of 1.16 g/cm3 and a water absorption capacity of 3.38%. However, the lowest thermal conductivity value was found in the fibre with weight fraction of 35%, namely 0.147 W/m. °C at a mass density of 1.24 g/cm3 and a water absorption capacity of 3.75%.
EFFECT OF A SCALED CANTILEVER BEAM ON NATURAL FREQUENCY Jhon Malta; Arif Gunawan; Lovely Son
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1266

Abstract

This paper deals with the scaling factor's effect on the cantilever beam's natural frequency. Scaling a prototype dimension will make it easier to manufacture and test the dynamic characteristics of structures with enormous sizes. Natural frequency is one of the essential parameters of the vibration characteristics of the system. The phenomenon that often occurs in vibrating structures is the resonance phenomenon. Resonance is a system state in which an abnormally large vibration is generated in response to an external stimulus, happening when the frequency of the disturbance is equal to, or nearly identical to, the natural frequency of the system. This research investigates the scale factor on natural frequency using the analytical method using Euler-Bernoulli beam theory, the MSC Nastran/Patran software, and experimental testing using an impact hammer on a cantilever beam. The three methods were applied to beams with four scaling variations: 1:1, 1:2.04, 1:2.85, and 1:3.48. Based on the results, the natural frequencies increase by the size scale reduction value in the modeling. The natural frequency value in the actual structure has a value equivalent to 1/S of the natural frequency value of the scale, whereas S is defined as the downgrade scale value. This result follows the Similitude theory.

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