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Khairul Anam
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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 244 Documents
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PREPARATION AND CHARACTERIZATION OF MICROCRYSTALLINE CELLULOSE FROM OIL PALM FROND BY CHEMICAL AND MECHANICAL TREATMENT Randis, Randis; Darmadi , Djarot B.; Gapsari , Femiana; Sonief , Achmad As’Ad; Rus , Tatag Yufitra
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.8

Abstract

Oil palm fronds are currently an underutilised by product of plantations. The micro and nano cellulose can be utilised to create new goods, such as being used as a filler in environmentally friendly degradable composites. This study examined the process of extracting oil palm frond fiber (OPFF) by using a series of chemical and mechanical treatments to get pure microcrystalline cellulose (MCC). The MCC obtained by OPFF was subsequently analysed in further detail. The identification of morphological analysis, presence of functional groups, and crystallinity index were conducted using Scanning Electron Microscopy (SEM), Fourier Transform InfraRed (FTIR) and X-Ray Difraction (XRD) techniques. The findings revealed the presence of microcrystalline structures in OPF fibers, having a mean measurement of width 3.2 ± 0.42 ?m. The application of FTIR verified that the elimination of noncellulosic constituents from the treated OPF fibers had achieved its utmost level. Simultaneously, X-ray diffraction research revealed that the utilization of chemical procedures resulted the formation of a characteristic cellulose crystal structure and an augmentation in the crystallinity index. However, the mechanical treatment resulted in a minor drop in the crystalline index. This can be ascribed to the disturbance of cellulose chains and the crystal structure within the cellulose fibers. The cellulose obtained from raw fibers and subsequent processing exists in a very pure form, specifically in the cellulose I? structure. This enables its utilization as reinforcement in eco-friendly MCC-based green composites, offering numerous benefits.
THE EFFECT OF COMPRESSOR WASH ON GAS TURBINE TEMPERATURE OF TURBOFAN ENGINE Abubakar, Abubakar; Wijayanti , Widya
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.9

Abstract

In this study, the impact of compressor washing on improving the performance and engine life of a turbofan engine is analyzed. The purpose of this research is to determine the outcomes resulting from the compressor wash treatment, as well as the patterns and characteristics of engine deterioration rates in each block cycle following the wash. It also aims to identify the optimal timing for conducting a compressor wash to achieve the most favorable results and maximize the on-wing life of the engine. This research was conducted using an analytical method, which involved analyzing the data received from the Aircraft Communications Addressing and Reporting System (ACARS) to assess the influence of engine performance and deterioration characteristics on the conducted compressor wash. One set of temperature margin data analyzed reveals the benefits of washing in terms of the turbine gas temperature (TGT) margin. It shows a 7°C increase in the TGT margin, indicating improved performance, but a 3.1°C decrease in the unrecoverable margin. Furthermore, the analysis of the margin data per 100 cycles indicates that the rate of deterioration is steeper during the initial 300 cycles compared to the subsequent cycles. Based on these findings, it is recommended to conduct the compressor washing process at around 300 cycles to maximize engine life and achieve enhanced efficiency.
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.
ECO – INNOVATIVE CARBURIZING: ENHANCING STEEL ST 37 WITH ALABAN CHARCOAL AND EGGSHELL CATALYSTS Ahmad Robittah; Suprapto, Wahyono; Widodo, Teguh Dwi; Wirawan , Willy Artha; Sabitah, A’yan
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.13

Abstract

This study examines the enhancement of St 37 steel through an eco-friendly carburization process using Alaban charcoal and eggshell catalyst. The agriculture sector in South Kalimantan, Indonesia, depends largely on metal tools made from low-carbon steel, which need greater hardness and durability. Traditional carburization techniques are costly and often lead to uneven carbon distribution. This research investigates the use of Alaban wood charcoal and local duck eggshell waste as carburizing agents. The experiment involved varying the weight ratio of charcoal to eggshell powder, then carburizing at 950°C for two hours, followed by water quenching. The results indicated a notable increase in surface carbon content, diffusion depth, hardness, and microstructure of St 37 steel. The optimal combination, achieving the highest surface hardness of 947 HV and a carbon diffusion depth of 1.0 mm, was found at an eggshell catalyst concentration of 30%. All samples exhibited a microstructural change to martensite. These results demonstrate the potential of using agricultural waste to enhance steel properties, promoting more sustainable and cost-effective industrial practices.
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.
EFFECT OF VARIABLE HELIX ANGLE OF END MILLING TOOL ON VIBRATION AND SURFACE ROUGHNESS OF SS-AISI 304 Sonief, Achmad As’ad; Sasongko, Mega Nur; Widhiyanuriyawan, Denny Widhiyanuriyawan; Pratikto, Pratikto
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.12

Abstract

Vibration in milling processes adversely affects product quality, machining precision, tool lifespan, and operating costs. A common vibration type, chatter, arises from self-excitation influenced by cutting parameters. Chatter can be classified into regenerative and resonant types. To mitigate resonance, cutting tools with variable helix angles are employed, as their varying pitch angles generate distinct tooth-passing frequencies for each blade. This study investigates the impact of helix angles on cutting parameters during end milling and their effects on vibration amplitude and surface roughness of AISI 304 stainless steel. Experimental end milling trials were conducted with different helix angle tools and cutting parameter variations. The findings reveal that optimizing the helix angle significantly reduces vibration amplitude and enhances surface finish. Controlling helix angle proves crucial for achieving superior surface quality and stable operation in end milling processes of stainless steel materials.

Page 13 of 25 | Total Record : 244

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