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Redaksi International Journal of Mechanical Engineering Technologies and Applications (MECHTA), Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Published by Universitas Brawijaya
ISSN : -     EISSN : 27223213     DOI : https://doi.org/10.21776/ub.mechta
Core Subject : Science, Engineering,
Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
International Journal of Mechanical Engineering Technologies and Applications (MECHTA) is published by Mechanical Engineering Department, Engineering Faculty, Brawijaya University, Malang, East Java, Indonesia. MECHTA is an open-access peer-reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. MECHTA accepts submissions from all over the world, especially from Indonesia. MECHTA aims to provide a forum for 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 MECHTA is specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in the English Language.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 12 Documents
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Search results for , issue "Vol. 6 No. 2 (2025)" : 12 Documents clear
COMBINATION OF OEE AND FMEA METHODS TO ANALYZE THE EFFECTIVENESS OF PRODUCTION MACHINES Wardhani, Angelia Kusuma; Novareza, Oyong; Purnami, Purnami; Mohamad, Effendi Bin
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.1

Abstract

Maintenance concepts are required for equipment to maintain effectiveness and quality. One of the maintenance concepts offered is total productive maintenance which connects the synergy between all functions in the organization. In tpm, there is a method to calculate the value of machine effectiveness, namely the overall equipment effectiveness method. The purpose of oee itself is to maximize the output of the results of the available capacity. In this study aims to see the value of the effectiveness of existing machines in the production process. It was found that some OEE values were still below the JIPM level. JIPM itself is the OEE benchmark standard used by the world, jipm explains that the world standard for OEE is 85%.  Therefore, it is necessary to improve the maintenance system by using the TPM pillars of autonomous maintenance and training and education.
DEVELOPMENT OF SYMMETRIC MODEL FOR FLUID-STRUCTURE INTERACTION SIMULATION ON STEAM TURBINE ROTOR Fauzi, Katanda Fajar; Choiron, Moch. Agus; Widodo, Agung Sugeng; Solikhin, Atfalus Solikhin
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.2

Abstract

Development of technology allows stress analysis of steam turbine rotor to be performed non-experimentally using Fluid-Structure Interaction (FSI) simulation. FSI modeling requires high computational power and a long time to complete. In this study, a symmetric model is used to reduce the computational time. The part size of the symmetric model is investigated for its influence on the FSI simulation results. The full, 1/5, 1/30, and 1 blade models were investigated. Fluid domain is solved by Computational Fluid Dynamic (CFD) simulation. Afterwards, pressure and temperature distributions are mapped to the structural simulation to determine the structural response in terms of stresses. The pressure distribution, temperature distribution, and stress distribution of each model were compared. The contours of pressure distribution, temperature distribution, and stress distribution have the same trend for all models. The pressure and stress value on sharp shape of the blade tip is slight difference due to insufficient number of elements.
AN ANALYSIS OF THE OPTIMISATION OF LEAF SPRINGPARAMETERS USING THE ASPECT RATIO-BASEDTAGUCHI-PARETO METHOD Oluwo , Adeyinka; Alozie , Nehemiah Sabinus; Ogunmola , Bayo Yemisi; Ajibade , Ayomide Tolulope; Rajan, John; Jose , Swaminathan; Oke, Sunday Ayoola
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.3

Abstract

This study introduces the aspect ratio Taguchi-Pareto to optimise the leaf spring parameters, using experimental designs and a combination of orthogonal arrays, and signal-to-noise ratios to estimate the optimal parametric settings. Furthermore, the Pareto analysis based on the 80/20 rule created the accepted or rejected experimental trials in the orthogonal arrays. It therefore streamlined the acceptable regions to only the vital signal-to-noise ratios. The research findings reveal that the optimal parametric setting is MA/MLL3MA/NL2MLL/MA3NL/MA3MLL/NL3NL/MLL2. This is interpreted as 0.008426 gcm-3mm-1, 0.565 g/cm3, 113.0876 g-1mm cm3, 0.63532 g-1cm-3, 178 mm, 0.004545 mm-1. The optimal parametric settings obtained enabled the benchmarking of performance standards for the leaf spring inputs while enhancing material usage. Practically, this study offers insights on optimizing leaf spring parameters considering aspect ratios instead of direct parameters. The findings can inform decisions on leaf spring designs and development to improve cost efficiency. Incorporating aspect ratios into the factor and level schemes presents a novel leaf spring design approach, offering a valuable tool for benchmarking and performance evaluation.
ANALYSIS OF THERMAL PROTECTIVE PERFORMANCE OF ALUMINUM FOIL INSULATION SUITS DUE TO VARIATIONS IN AIR GAP THICKNESS Mahendra, Kiemas Aji Andika; Wahyudi, Slamet; Siswanto, Eko; Yao, Jiafeng
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.4

Abstract

This study investigates improving the thermal protective performance (TPP) of aluminum foil insulation suit by incorporating air gaps to reduce heat transfer. Firefighters rely on personal protective equipment that must meet NFPA 1971 standards, requiring a minimum TPP of 35 cal/cm². Using a heat transfer bench scale test, three-layer aluminum foil insulation suits with air gaps ranging from 0 mm to 7.68 mm were tested. Each sample was exposed to heat until the innermost layer reached 55°C. The analysis of temperature, heat transfer rate, heat flux, second-degree burn time, and thermal resistance revealed that a TPP exceeding 35 cal/cm² was achieved at a 6.4 mm air gap, peaking at 36.30 cal/cm² at 7.68 mm. The increase in TPP with larger air gaps was due to higher thermal resistance and extended burn times. Thus, a minimum air gap of 6.4 mm is recommended for firefighter clothing to meet safety standards.
THE UTILIZATION OF GEOTHERMAL SILICA WASTE IN ADDITIVE MANUFACTURING WITH STEREOLITHOGRAPHY RESIN FOR DETAILED PROTOTYPING PROCESS Tanbar, Fefria; Darmawan, Muhammad Rakhadzaky Indra; Wibisono, Muhammad Maheswara; Ariyadi, Hifni Muchtar; Nugraha, Ariyana Dwiputra; Wiranata, Ardi; Muflikhun, Muhammad Akhsin
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.5

Abstract

Silica deposit powder from geothermal waste often becomes material waste that difficult to utilize and re-use. The characterization of silica deposit powder has a significant part in understanding its structure, composition, and potential application. Using silica as a filler system in additive manufacturing is one of the processes that can utilize silica deposit powder. This material has the potential to be used to create prototype product with stereolithography resin for 3D printing. The present study discusses the ability to mix specimens of silica (size 600 microns) and resin with a composition ratio of 1:100. The turbidity test revealed that the specimen mixed in the resin contents showing after 30- and 40-minutes examination from spectrophotometer. In the hardness test, by adding filler materials, it is shown that the filler decreased the hardness more than 46%. This research also successfully examines the most effective particle sizes to the length of time required for the mixing and curing processes in order to obtain the most optimal results.
EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES AND CORROSION RATE OF LOW CARBON STEEL AISI 1020 RESULTING FROM LOW PRESSURE GAS CARBURIZING Audrey, Reinaldo Evan; Setyarini, Putu Hadi; Sugiarto, Sugiarto; Sholikin, Atfalus
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.6

Abstract

Within the realm of demanding marine operations, tugboat chain sprockets have a vital function in guiding and controlling giant ships. Marine conditions provide considerable obstacles for chain sprockets, which are commonly constructed from low-carbon steel for their cost-effectiveness and mechanical appropriateness. One such problem is corrosion, which can result in material failure. AISI 1020, a low-carbon steel containing around 0.2% carbon, provides exceptional toughness and resistance to corrosion, especially for applications in mining and oil platforms. The poor corrosion resistance of the material, worsened by exposure to air and salt in saltwater, requires a remedy. In order to enhance wear and corrosion resistance, low-pressure gas carburizing (LPGC) is suggested as a method to augment surface hardness and establish a durable oxide layer. This approach provides benefits in managing carbon penetration with less distortion and environmental effect as compared to conventional carburizing methods. Evidence indicates that low-pressure carburizing increases the flow of hydrocarbon gas, which in turn promotes even diffusion of carbon, thereby enhancing the distribution of hardness. The work explores the efficacy of LPGC in improving the operating longevity and efficiency of chain sprockets in marine environments. Its objective is to investigate how carbon augmentation via LPGC changes the steel microstructure, enhances corrosion resistance, and increases tensile strength. Materials utilized were AISI 1020 low-carbon steel plates. They were treated by regulating temperature fluctuations and specific durations of holding. Subsequently, the plates underwent measurements of Micro-Vickers hardness, tensile strength, SEM-EDX analysis, and corrosion using a Tafel Extrapolation. Results indicate a substantial rise in hardness in carburized specimens, with the best result achieved at 950°C for 60 minutes. According to the study, LPGC successfully enhances the mechanical and anti-corrosive characteristics, therefore prolonging the lifespan of nautical components and maximizing their performance under demanding circumstances.
STUDY ON THE SHRINKAGE POROSITY OF AUTOMOTIVE PARTS QUALITY: THE INFLUENCE OF REINFORCED SHELL MOLD THICKNESS IN INVESTMENT CASTING Khoiruddin, Sukhoiri; Darmadi, Djarot B.; Huang, Cheng-Fu; Lee , Sheng-Chan; Chan, Chien-Wei
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.7

Abstract

This study investigates the effect of shell mold thickness on shrinkage porosity observed through numerical simulation using a computer-aided numerical testing (CAE) approach and testing of mechanical, thermal, and physical properties of shell molds. This study investigated whether the thermal properties of different shell mold layer thicknesses. The results showed that the modulus of rupture (MOR) had a value of 6.66 MPa, the permeability was in the range of 1.8x10-¹² m² to 6.6x10-¹² m², the heat transfer coefficient (HTC) had a value in the range of 900 W/m²-K to 660 W/m²-K. The CAE simulation shows that the initial coating thickness will cause problems in the thick corner area for automotive parts. To reduce the hot spot area is to increase the thickness of the mold shell to reduce the percentage of hot spots, which can reduce the possibility of shrinkage formation by 34% that occurs at a mold shell thickness of 6.5 layers can be reduce about 24% compared shell thickness of 4.5 layers. In this study, the best solution to increase the productivity of investment casting is the selection of mold thickness and here for objects that have high dimensions and accuracy must be correct in determining the use of shell mold thickness because different objects will certainly affect the defects that occur.
SPATIAL AND TEMPORAL POTENTIAL OF CURRENT ENERGY AND WAVE HEIGHT IN INDONESIAN SEA Alamsah, Azwar; Wahjudi, Ari; Moon, Park Jae; Hamidi, Nurkholis; Widhiyanuriyawan, Denny
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.8

Abstract

The energy demand in Indonesia continues to rise, with a primary reliance on fossil fuels, leading to environmental issues such as increased CO2 emissions. To address these challenges, the exploration of renewable energy, particularly from wave and ocean current sources, becomes crucial. This research analyzes the energy potential generated from waves and ocean currents throughout Indonesia using the WAVEWATCH-III method for modeling marine data over a 10-year period. The results indicate that the energy potential from ocean currents ranges between 120-150 kW, with strategic locations around straits such as the Makassar Strait and the Java Sea. Meanwhile, the potential energy from ocean waves reaches approximately 2.5 GW over a three-month period, thanks to Indonesia's extensive coastline of 99,093 km. Spatial and temporal analyses reveal significant variations in Sea Level Anomaly (SLA) values, which can be utilized for the development of renewable energy projects. The conclusion of this research emphasizes the need for a deeper understanding of the dynamics of ocean currents and waves to maximize the utilization of renewable energy potential in Indonesia.
CRASH BOX DESIGN WITH METAL FOAM FILLING MADE VIA MELT ROUTE AND CALCIUM CARBONATE BLOWING AGENT Hartanto, David Satya; Choiron, M. Agus; Purnowidodo, Anindito; Ariadi, Yudhi
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.9

Abstract

The crashworthiness of daily passenger vehicles has been continuously developed to improve the safety of a passenger on collision. This study presents a simulation on thin-walled foam filled crash-box based on finite element methods to improve the current crash box design while also maintaining the usage of simple geometry in form of rectangular tube. This crash box is modeled as foam filled thin-walled structure that is intended to be mounted on the frontal side of car chassis. This simulation was carried out using frontal impact test, with an impactor speed of 10 m/s. The foam-filling of the crash-box is created in-house by the researcher, using calcium carbonate blowing agent on melt route process. By observing the area under the curve of the relationship between the force-reaction and the displacement, the energy absorption can be calculated. The simulation also reveals the deformation patterns on the crash box. The result of the simulation shows that foam-filling on thin-walled crash box improves the deformation behavior of the crash box and subsequently improving the energy absorption figure and its crushing force efficiency.
APPLICATION of ENTROPY MULTICRITERIA METHOD FOR PARAMETRIC CLASSIFICATION of THE WIRE ELECTRICAL DISCHARGE MACHINING PROCESS USING NITINOL-60 SHAPE MEMORY ALLOY Ogunmola, Bayo Yemisi; Onitiri, Modupe Adeoye; Alozie, Nehemiah Sabinus; Oluwo, Adeyinka; Okwo, Jeremiah Ugo; Rajan, John; Jose, Swaminathan; Oke, Sunday Ayoola; Aderibigbe, Samuel Bolaji
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.10

Abstract

Nitinol-60 shape memory alloy (SMA) is known for its outstanding super elasticity non-magnetic properties, vibration absorption, high hardness and long fatigue life, among others. However, its conventional processing is difficult, complex and time-consuming, making the wire electrical discharge machining (WEDM) a viable option. Additionally, the choice of multicriteria methods is growing drastically in machining for economic and planning advantages. This paper presents an L15 orthogonal array analysis of the WEDM process parameters for nitinol-60 using the entropy method. The principal parameters are the gap voltage, dielectric flow rate and duty factor. However, the responses are surface crack density, recasting of larger thickness, and cutting rate. The procedure starts with the design of an experimental matrix with fifteen experiments. Then the parameters and responses are as beneficial and non-beneficial while their normalization is made. The entropy method is applied and the results are reported for the first time in the WEDM process of nitinol-60. to ensure optimum performance of the WEDM process, priority should be given in descending order to duty factor, dielectric flow rate and gap voltage at 0.1398, 0.1325 and 0.1117, respectively. to prioritize the responses, the average peak-to-valley height, maximum peak-to-valley heights and the cutting rate obtained the first, second and third positions, respectively. The findings presented in this work highlight the importance of nitinol-60 SMA as a promising candidate for medical devices and aerospace components. These are of public interest including neurovascular, dentistry, orthopedic, endoscopy and vascular intervention. It therefore offers new insights into planning in healthcare and wellbeing.

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