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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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INDONESIA
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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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.
KARAKTERISTIK MEKANIK DAN BALISTIK KOMPOSIT Al-8Zn-4Mg-20 VOL.% SiC HASIL PROSES SQUEEZE CASTING DAN PERLAKUAN PENUAAN Sabarati, Absaralita; Adhipura, Panji; Sofyan, Bondan T.
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1819

Abstract

Armoured Personnel Carrier (APC) as a means to support the mobility of TNI must have high toughness so that they are not easily penetrated by bullets. The APCs are commonly made of steel due to their excellent toughness and ballistic properties, however, it has a high density that reduces their mobility. Therefore, an alternative material is needed, which is lighter but remains tough. One option is Metal Matric Composites (MMC). This research studied a composite with Al-8Zn-4Mg alloy as the matrix and 20 vol. % SiC as the reinforcement. The composite was melted in a muffle furnace, stirred at 500 rpm, and squeeze-cast at the pressure of 20 tons. The samples were then solution-treated at 500°C for 1 h and aged at 200°C for up to 100 h. Characterization included hardness and impact testing, optical microscopy, and Scanning Electron Microscope - Energy Dispersive X-ray (SEM-EDX). The samples were then thermal coated by the High-Velocity Oxygen Fuel (HVOF) method using WC-Co particles. The coated samples underwent ballistic testing in accordance with NIJ 0108.01 standard by using a type III 7.56 mm caliber projectile. The results show that the hardness and impact energy increased with aging due to the formation of Mg2Si and Mg3Zn3Al2 precipitates. Peak hardness conditions after aging for 2 h generated hardness of 90,25 HRB and impact energy of 3 Joules. The composite plate failed and was penetrated by a type III 7.56 mm caliber projectile.
STUDI IDENTIFIKASI PASANGAN COMMERCIALLY PURE TITANIUM DAN UHMWPE UNTUK APLIKASI MATERIAL IMPLAN LUTUT Rusdi, Firman Maulana; Cahyani , Arini Dwi
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.v15i3.1820

Abstract

Orthopedics is a science that studies the human body skeleton. This field of science helps patients who experience joint and skeletal problems. One of the problems faced is the need for body frame components to be replaced, for example the knees. This replacement requires a man-made component, namely an implant. Implants can be made from metal, polymer, and ceramic. The biomaterial implant identification process includes X-Ray Diffraction analysis, hardness and tensile testing. XRD testing of CP–Titanium and UHMWPE using the Rigaku XRD tool. CP–Titanium hardness testing uses Vickers micro hardness, while for UHMWPE uses Shore D. CP–Titanium tensile testing uses a universal test machine with JIS Z2201 standards. Another material, namely UHMWPE, is tested using the same equipment as the ASTM D638 standard. The XRD test results for CP - Titanium show peaks of 35.3˚, 38.6˚, 40.2˚, namely the hexagonal structure of the compound element α - Ti. Meanwhile, UHMWPE material shows peaks (110) at 21.66˚ and (200) at 24.16˚. The peak data is an orthorhombic crystal structure, which is characteristic of polyethylene. The CP – Titanium hardness test results show an average hardness of 360.47 VHN. The hardness value of UHMWPE shows an average hardness of 48.5 Shore D. CP - Titanium tensile testing shows a maximum stress value of 534.4 MPa and a maximum strain value of 0.022. The UHMWPE tensile test showed an average maximum stress value of 23.87 MPa and an average maximum strain value of 1.36. The data above shows that the materials tested are CP - Titanium and UHMWPE. Hardness data indicates that these CP – Titanium and polyethylene materials are too soft for applications requiring wear resistance.
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.
STUDI PERFORMA PEMANEN ENERGI PIEZOELEKTRIK DENGAN METODE VORTEX INDUCED VIBRATION Gamayel, Adhes
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.v16i1.1829

Abstract

Piezoelectric energy harvesters (PEHs) convert mechanical energy into electricity. They operate based on pressure or vibration. One method for inducing vibration in PEHs is vortex-induced vibration (VIV), which harnesses wind energy using a bluff body. In this study, the researchers investigated the output voltage generated by PEHs at different altitudes, specifically 6.25 cm and 12.5 cm. Both experimental and simulation approaches were employed. The experimental setup included a PEH composed of a piezoelectric bimorph and a rectangular-trapezoid substrate. Wind speeds of 5, 7, and 9 m/s were tested in a wind tunnel with a cross-section of 250 mm x 250 mm. The simulation utilized the finite element method to explore wind flow patterns. Notably, the results revealed that PEHs positioned at an altitude of 6.25 cm generated higher voltages than those at 12.5 cm. At an altitude of 6.25 cm, each wind speed's maximum electrical voltage values are 4.18 volts, 4.67 volts, and 5.13 volts, respectively. The maximum electric voltage value at a height of 12.5 cm for each wind speed is 2.1 volts, 3.94 volts, and 4.44 volts, respectively. This phenomenon is attributed to the narrowing of the wind tunnel’s inlet area due to the presence of a bluff body, leading to increased air velocity along the tunnel walls. Consequently, a vortex forms near the square bluff body, resulting in pressure fluctuations that induce PEH vibration and generate voltage.
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.
DURASI PERAWATAN OPTIMUM UNTUK FASILITAS PRODUKSI MINYAK DAN GAS DI KILANG TUBAN EAST JAVA Yahya, Indra Nur; Mahatwan, Dian; Setiawan, Ari; Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1839

Abstract

Electric Submersible Pump (ESP) is one of the most critical oil & gas equipment in Tuban East Java (TEJ) field. This research applies Reliability Centered Maintenance (RCM) to oil & gas to optimize maintenance methods for ESP at the TEJ field. The RCM was applied based on the historical failure events at equipment which caused Loss Production Opportunity (LPO). Start with Pareto chart, the RCM followed by Failure Modes and Effect Analysis (FMEA) that produced the Risk Priority Number (RPN) for the 80% problems. The last step provided the optimum maintenance periods using Weibull’s statistic. The result shows that flat cable in ESP has the highest RPN. Flat cable requires an optimum maintenance period of 509 days and a total cost of US$59,342. The total cost consists of Periodic Maintenance (PM) and Risk costs.
JARAK ROTOR YANG OPTIMAL TERHADAP RIPPLE PLATE PADA MESIN RIPPLE MILL UNTUK EFISIENSI HASIL PEMECAH BIJI KELAPA SAWIT CB MODIPALM KAPASITAS 8 TON/JAM Harianto, Agus; Aspiyansyah, Aspiyansyah; Faot , Ecy Yedija
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1840

Abstract

A ripple mill machine is one of the crucial pieces of equipment in the palm oil processing industry to separate oil palm kernels into fruit kernels and shells. One of the key components in this machine is the rotor and ripple plate, which play a role in the process of breaking seeds. This study aims to determine the optimal distance between the rotor and ripple plate on the ripple mill machine. The test was conducted using a CB Modipalm-type ripple mill machine. The parameter observed was the cracking efficiency of oil palm kernels, which was measured based on the percentage of cracked seeds, whole seeds, and crushed kernels. The results showed that the optimal distance between the rotor and ripple plate was 5 mm, with an efficiency value of 96.62%.

Page 91 of 97 | Total Record : 965

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