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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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ANALYSIS OF OIL CHARACTERISTICS FROM PYROLYSIS OF LOW DENSITY POLYETHYLENE (LDPE) PLASTIC WASTE IN A SMALL CAPACITY REACTOR Purnama, Ari; Effendy, Marwan; Ngafwan, Ngafwan
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.10

Abstract

Plastic waste in Indonesia remains a significant unresolved issue, particularly due to the extensive use of plastic bags in the food sector, industry, and other areas, which adversely affects the environment. Addressing this, one effective approach is converting plastic waste into fuel oil through the pyrolysis process. The process involves preparing pyrolysis equipment and extracting oil by conducting laboratory tests on the properties of pyrolysis oil, including Gas Chromatography-Mass Spectrometry (GCMS), Fourier Transform Infrared (FTIR) spectroscopy, and droplet combustion tests. Pyrolysis is performed by heating plastic waste at temperatures ranging from 250°C to 400°C. This study focuses on pyrolysis oil derived from Low-Density Polyethylene (LDPE) plastic, which can be used as an alternative fuel. The results show that pyrolysis oil can be ignited with sparks at a heating temperature of 300°C, exhibiting a viscosity of 1.1378 cP and a calorific value of 10,965.2 cal/g.
Performance Enhancement of a 2-Cylinder Engine with Naphthalene Addition to RON 90 Hariyadi, Muhammad Arif; Aspiyansyah, Aspiyansyah; Harianto, Agus; Pratama, Rubi
International Journal of Mechanical Engineering Technologies and Applications Vol. 1 No. 2 (2020)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2020.001.02.8

Abstract

The octane number of fuel is crucial for the performance of a two-cylinder gasoline engine. This study aims to enhance the octane number by using naphthalene. The method involved mixing RON 90 gasoline with naphthalene to evaluate engine performance parameters, including torque, power, specific fuel consumption, and efficiency. The results indicate that adding 20 mg of naphthalene to 1 liter of RON 90 gasoline optimizes the performance of a two-cylinder gasoline motorcycle engine.
ROTARY SOOT BLOWING TREATMENT INCREASES EFFECTIVENESS OF ECONOMIZER CAPACITY OF 58.5 TPH AT PT SBI INDONESIA Harianto, Agus; Aspiyansyah, Aspiyansyah; Rahman, Muhammad Muksin Galih
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.11

Abstract

In an industrial era that increasingly prioritizes energy efficiency and environmental sustainability, optimizing the use of energy in the production process is crucial. One of the key aspects of achieving this goal is utilizing waste heat to improve the overall efficiency of the system. In this context, the use of economizers has become a major focus in the boiler industry. PT Surya Borneo Industri (SBI), as an industrial entity committed to energy efficiency and environmental sustainability, has adopted the latest technology in a bid to improve the performance of their boiler system. One of the latest innovations they have implemented is the use of rotary soot blowing, an automated device designed to clean the heat exchanger surfaces in the economizer. This study aims to determine the effectiveness value of the economizer before and after the rotary soot blowing treatment on the PT SBI boiler system. Through a series of field observations and data analysis, this research reveals the potential benefits of using rotary soot blowing in improving thermal efficiency, reducing energy losses, and contributing to the sustainability of industrial operations. The results obtained showed that the economizer effectiveness value before the rotary soot blowing treatment was 55, 54, 55, and 54%, and after the rotary soot blowing treatment, the effectiveness value increased to 59, 60, 61, and 60%. This is due to maintenance activities, namely cleaning dust or soot attached to the economizer pipes.
SUPERHYDROPHOBIC AND ANTIBACTERIAL COATINGS ON VARIOUS COTTON FABRICS USING ZNO AND AESO Wijaya, Hastono; Gapsari, Femiana; Sulaiman, Abdul M.; Harmayanti, Afifah; Barasa, Alvadro; Andrean, Janu; Warman, Sa Bashkaran Adi; Kriswardhana, Willy; Naimah, Azimatun
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.12

Abstract

Superhydrophobic coatings on cotton utilized in medical applications like hospital gowns and bed linens to offer a protective barrier against fluids and bacteria. Masks were worn with different types of materials. In this study, various cotton employed ZnO and AESO to effectively decrease the surface energy of cotton fabric via a Schiff base reaction. This chemical transformation resulted in the formation of a textured surface structure that exhibited robust adhesion qualities. The study demonstrates that the superhydrophobic coating on silk fabric increases 153. 59%. The coating on silk provides a reference for fabric types with ZnO and AESO coatings.
THE EFFECT OF ADDING ANDESITE MASS FRACTION TO ALUMINUM MATRIX COMPOSITES ON WEAR, HARDNESS, AND MICROSTRUCTURES Santoso, Budi; Suprapto, Wahyono; Irawan , Yudy Surya; Thanigaivelan, R.
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.1

Abstract

This study analyzes the effect of adding andesite mass fraction on the mechanical properties of Aluminum Matrix Composite (AMC), especially hardness, wear rate, and microstructures, to develop AMC with new reinforcement. The test results show that increasing the andesite mass fraction increases the hardness of AMC, with the highest average hardness value reaching 96.0 HRB in Al-Zn-7.5% Andesite variation. In contrast, the variation without andesite addition showed the lowest hardness of 74.8 HRB. The microstructures analysis showed an even distribution of andesite particles, which contributed to the increase in hardness and indicated good material homogeneity. Nonetheless, the increase in porosity in Al-Zn-10% Andesite variation affected a decrease in hardness and wear rate, noting the importance of control over such factors in developing AMCs for applications requiring high mechanical resistance. This study provides a reference for AMC development on optimizing the composite material composition to achieve an optimal balance between hardness and wear resistance.
THE EFFECT OF SIMULATED VERTICAL VIBRATION AND STACKING PATTERN ON QUALITY OF TOMATOES Rayyan, Rayyan; Novareza, Oyong; Sonief, Achmad As'ad
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.2

Abstract

Simplification of tomato fruit transportation was applied as the preparation. Three tomato fruit Computer-Aided Design (CAD) geometries had been arranged as the face-centered cubic (FCC), jumble, and traditional patterns. Boundary condition, meshing, and contact were determined to ensure the pattern could be simulated as real as possible. Modal analysis simulation is used to find out the natural frequency and mode shape for each pattern. The result was then extracted for static structure analysis. 5N, 10N, and 15N forces are placed on the top of the fruit pattern. Deformation and normal stress pattern results were analyzed as the reaction when the tomatoes respond to external forces. This research is finding the FCC pattern gives more minimal damage to the fruit.
STRESS CORROSION CRACKING IN CONSTRUCTION STEEL USING NACL SOLUTION Gita, I Wayan Ekagra Mana Krsna; Dharmadi , Djarot B.; Sugiarto, Sugiarto
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.3

Abstract

Corrosive environments can accelerate the degradation of steel materials through various mechanisms, one of which is corrosion. Corrosion is a chemical process that involves the interaction between metals and environmental elements, such as oxygen, water, and salts, leading to degradation of the material. One particularly detrimental form of damage to construction steel is Stress Corrosion Cracking (SCC). A specimen with an initial crack, either existing or pre-engineered, is subjected to constant stress under dissolved conditions in a corrosion environment.  Subsequently, the initial crack in the specimen will propagate until the appearance of a fracture. The SCC process begins with tensile stresses resulting from the load applied to the material. The specimen that has the highest fracture time is GTAW welding with PWHT treatment with a time of 65.33 minutes. The PWHT process has an impact on the length of fracture time on the SCC test specimen.
THE ROLE OF SHELL MOLD THICKNESS IN CONTROLLING SHRINKAGE POROSITY OF CAST AUTOMOTIVE PARTS Khoiruddin, Sukhoiri; Darmadi, Djarot B.; Wu, Ssu-Han
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.4

Abstract

This study investigates the effect of shell mold thickness on shrinkage porosity observed through numerical simulation using a computer-aided engineering (CAE) approach and testing of mechanical, thermal, and physical properties of shell molds. This study investigated 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, and 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 which occurs at a mold shell thickness of 6.5 layers can be reduced by about 24% compared to a 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 therefore, 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.
ANALYSIS OF THE EFFECT OF TEMPERATURE ON THE PHYSICAL PROPERTIES OF CATALYTIC CRACKING OF COCONUT OIL MICROEMULSION BIODIESEL Paepenan, Semuel Poumer; Hamidi, Nurkholis; Purnami, Purnami; Anggara, Teuku
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.5

Abstract

This study aims to analyze the effect of catalytic cracking temperature variation on the physical properties of coconut oil-based microemulsion biodiesel using a zeolite catalyst. The microemulsion biodiesel was produced by mixing coconut oil, ethanol, and butanol, followed by catalytic cracking treatment at temperatures of 50°C, 75°C, 95°C, 125°C, and 150°C. The key parameters observed included viscosity, density, flash point, calorific value, and cetane number. The results showed that increasing the catalytic cracking temperature led to a decrease in viscosity from 15.24 stokes in its initial state to 10.48 stokes at 150°C, indicating the breakdown of heavy molecules into lighter fractions. Density fluctuated, reaching its highest value of 0.879 g/cm³ at 75°C before stabilizing at approximately 0.878 g/cm³ at 150°C. The flash point exhibited a non-linear trend, peaking at 30.5°C at 75°C before decreasing again. The calorific value increased significantly from 8769.70 cal/gram to 9342.93 cal/gram at 150°C, demonstrating an enhancement in the energy content of the biodiesel. Meanwhile, the cetane number was recorded at 75 at both 95°C and 150°C, indicating good combustion quality. Based on these findings, the optimal catalytic cracking temperature was determined to be 150°C, yielding biodiesel with lower viscosity, higher calorific value, and improved combustion performance. This study demonstrates that catalytic cracking can enhance the quality of microemulsion biodiesel, with further optimization potential for industrial-scale applications.
THE EFFECT OF SWEET ORANGE PEEL OIL ADDITIVE ON VIRGIN COCONUT OIL COMBUSTION CHARACTERISTIC Sangkilang, Elvinda; Sasmoko, Sasmoko; Wijayanti, Widya; Wardana, ING
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.6

Abstract

Biodiesel is a viable renewable alternative energy source to develop and further utilize in order to maintain environmental sustainability. Virgin coconut oil (VCO), which is plentiful in Indonesia, is one of several vegetable oils that has the potential to be converted into biodiesel. The viscosity and density of VCO are high due to the glycerol and three fatty acid components, which have a notable impact on both the performance and efficiency of combustion. Sweet orange peel oil additive plays an important role in enhancing combustion because its chemical compound, which has an aromatic structure, can influence molecular interactions, thereby enhancing the kinetic energy of fuel molecules, which consequently improves the combustion performance of vegetable oil. The combustion process was visually examined using the high-speed camera Canon 600D. The results show that the flame dimensions increased and its color changed from orange to blue, indicating that utilization of sweet orange peel oil could enhance the combustion energy values, the blue color has a greater energy level in the visible light spectrum than the orange hue. Furthermore, it was noted that the ignition delay time showed a decrease in duration, but the burning time showed a comparable pattern of being extended. Vegetable oil deforms and becomes more reactive due to the disruption of its molecular structure caused by the magnetic field of the aromatic structure found in sweet orange peel oil. This phenomenon was confirmed by molecular dynamic simulation using the HyperChem 8.0.10 software.

Page 24 of 25 | Total Record : 244

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