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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 249 Documents
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EFFECT OF ALKALI TREATMENT ON MECHANICAL AND THERMAL PROPERTIES OF SISAL FIBER FOR COMPOSITE APPLICATIONS Parahdiba, Nursyahbani Putri; Anam, Khairul; Gapsari, Femiana; He, Rui-En
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.2026.007.01.7

Abstract

The demand for sustainable and high-performance composite materials has driven extensive research on natural fiber reinforcements, including sisal fiber, to enhance their mechanical and thermal properties. However, the inherent hydrophilicity and weak interfacial adhesion of sisal fibers limit their effectiveness in composite applications. In this study, untreated and alkali-treated sisal fibers were characterized using tensile testing, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results showed that alkali treatment reduced tensile strength from 2080 MPa to 1142.1 MPa but slightly increased elongation at break from 2.5% to 2.9%, while XRD analysis indicated a higher crystallinity index, and TGA confirmed improved thermal stability with an increased decomposition temperature from 220°C to 260°C. These findings provide valuable insights into optimizing sisal fiber treatment for enhanced fiber-matrix interactions, contributing to the development of more durable and sustainable natural fiber composites.
PERFORMANCE MODELING OF PLTU PAITON 1 WITH VARIATIONS IN MAIN STEAM PRESSURE, TEMPERATURE, AND CONDENSER PRESSURE USING GATECYCLE Loasana, Okto Rosario Nisen; Iqbal, Muhammad; Soeparman, Sudjito; Yuliati, Lilis
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.2026.007.01.8

Abstract

Paiton Unit 1, 400 MW power plant, has been the subject of a detailed performance analysis utilizing modelling and simulation techniques employing GateCycle software. This study encompasses an evaluation of the impact of variations in main steam pressure, condenser pressure, and main steam temperature on key performance parameters, including thermal efficiency, heat rate, condenser duty, and power generation. The model underpinning this analysis was developed based on the heat balance scheme of Paiton Unit 1 PLTU, and its validity was confirmed through validation using operational data. The simulation results demonstrate that an increase in main steam pressure and temperature leads to enhanced thermal efficiency and output power of the plant, while an increase in condenser pressure results in reduced efficiency and net power generation. A decrease in condenser pressure increases the pressure difference between the turbine and condenser, thereby facilitating greater energy conversion to mechanical power. Heat rate analysis reveals that the heat rate value decreases with increasing main steam pressure and temperature and decreasing condenser pressure, indicating an increase in system efficiency. This study validates the hypothesis that optimization of key operational parameters at Paiton Unit 1 PLTU can enhance plant efficiency and reduce fuel consumption, thereby providing both technical and economic benefits.
SUSTAINABLE CORROSION INHIBITION OF COPPER USING SANTOL (SANDORICUM KOETJAPE) FRUIT PEEL EXTRACT IN ACIDIC MEDIUM Ainunsyah, Zul; Gapsari , Femiana; Darmadi, Djarot B.; Sasmito, Muhammad
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.2026.007.01.9

Abstract

Corrosion control is crucial to material protection, particularly in industrial applications where metal degradation leads to significant economic losses. One of the major challenges in corrosion research is finding effective and eco-friendly inhibitors that can replace traditional toxic chemical inhibitors. This study explores the use of Santol (Sandoricum koetjape) fruit peel extract as a potential green inhibitor for copper corrosion in a 1 M HNO3 solution. Electrochemical techniques, including potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), were used to evaluate the inhibition efficiency of the extract. The results showed a significant reduction in the corrosion rate, with an inhibition efficiency of 77.33% from PDP analysis and 97.50% from EIS measurements. The corrosion current density decreased from 1408.30 microA to 319.25 microA, and the charge transfer resistance increased from 22.56 Ohm to 902.88 Ohm. Santol fruit peel extract effectively inhibits copper corrosion, promoting the development of sustainable corrosion inhibitors and using agricultural waste as an alternative to conventional chemical inhibitors.
DESIGN AND CONSTRUCTION OF A SIMPLE FATIGUE TESTING DEVICE FOR PUSH BUTTONS USING PNEUMATIC AND DC MOTOR SYSTEMS BASED ON PROGRAMMABLE LOGIC CONTROLLER Hidayah, Alfi Noer; Zaenudin, Mohamad; Saleh, Yasya Khalif Perdana
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.2026.007.01.10

Abstract

Button fatigue testing remains prohibitively expensive for SMEs due to commercial systems costing >$5,000. This study develops a low-cost tester of less than $500, PLC-controlled using dual actuation systems (pneumatic and DC motor) to evaluate pushbutton durability under 100–300 g loads. The pneumatic system maintained extensive pressure stability of ±0.00 MPa at 0.04 MPa for 200 g testing but exhibited 20.64% load deviation due to compressor-induced 600 g transient spikes during reservoir refills. Alternatively, the DC motor system achieved high-precision 100 g testing at 270 rpm with 3.98% deviation with stable speed around 260–278 rpm but failed operationally at 540 rpm for 300 g loads due to vibration-induced signal disruption after cycle 277. Moreover, pneumatic actuation proved more suitable for loads lower than 200 g, completing 10,000 cycles despite load spikes, while a DC motor maintains stability at lower than 200 g with near-constant force below 500 rpm. This study establishes a clear implementation framework: pneumatic systems for production-line screening where ±20% deviation is acceptable per ISO 9241-410 and DC motor systems for calibration-grade testing requiring <5% deviation. The prototype bridges the affordability gap for SMEs and educational institutions, with future work targeting vibration dampeners and pressure accumulators to achieve ASTM E467-21 compliance.
A NEW DEVELOPMENT OF AN X–R CONTROL CHART OPTIMIZED WITH TAGUCHI, TAGUCHI-PARETO AND TAGUCHI-ABC METHODS FOR MAINTENANCE RELIABILITY OPTIMIZATION Oluwo, Adeyinka; Alozie, Nehemiah Sabinus; Ogunmola, Bayo Yemisi; Raji, Akinwale Olusegun; Rajan, John; Jose, Swaminathan; Oke, Sunday Ayoola; Aderibigbe, Samuel Bolaji
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.2026.007.01.11

Abstract

This paper aims to develop a variable control chart-based (R chart and X bar) method to determine the stability and predictability of the maintenance reliability parameters in a grain-based food processing plant in Nigeria. The R chart and X bar charts were developed using the changes in the range and average of reliability parameters over the maintenance period. The previous study, which is extended here, evaluates reliability parameters for 35 weeks to capture the plant's frequency of failure, MTTR, MTTF, and downtime. These are transformed into the Weibull probability density function, cumulative density function, reliability, and hazard rate and measured from the viewpoint of orthogonal array generation and analysis. This paper found that the variable control chart–based method provides an expression for the stability and prediction of the maintenance reliability parameters using Taguchi-based methods. The proposed approach would be valuable for maintenance managers to understand the behavior of their system parameters in attaining sustainable practices in the grain-based food industry. This study analyses the interactions of the maintenance reliability parameters in the grain-based food industries, which is new in the food equipment maintenance domain of practice. The originality and novelty of this approach will aid in establishing controls while ensuring that maintenance costs are minimized.
ANALYSIS OF BLOOD FLOW THROUGH STENT IN COMMON CAROTID ARTERY Satriawan, Muhammad Bagas Yudanto; Winarto, Winarto; Yuliati, Lilis
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.2026.007.01.12

Abstract

The human body's circulatory system consists of many blood vessels, one of which is the carotid artery. However, the carotid artery in blood circulation is prone to carotid stenosis. A common method to cure carotid stenosis is to install a stent in the vessel. One of the most important parameters of stenting to prevent stenosis is the blood flow shear stress on the stent wall. After installing a stent, there is still a possibility of blockage again in the blood vessel, which is called in-stent restenosis. The number of stent cells is one of the main parameters that affect the blood flow and shear stress as well. In this research, the number of cells was varied to examine their effect on time-averaged wall shear stress, oscillatory shear index, and stent structural deformation with the computational fluid dynamics method by considering fluid-structure interaction. The result showed that the greater the number of cells, the higher the time-averaged wall shear stress and the lower the oscillatory shear index. This means a higher number of cells results in a smaller possibility of stenosis. Moreover, a stent with six cells has higher deformation than the other stents. This research provides a reference to estimate the possibility of carotid artery stenosis disease.
THE ROLE OF VISIBLE LIGHT IN OPTIMIZING HYDROGEN YIELD DURING ALKALINE ELECTROLYSIS Santoso, Mardi; Ahmad, Anton Royanto; Purnami, Purnami; Hamidi, Nurkholis
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.2026.007.01.13

Abstract

Hydrogen is a clean energy carrier, but the efficiency of its production via alkaline water electrolysis remains a key challenge due to high energy consumption and limited reaction kinetics. This study explores the potential of visible light irradiation—specifically red, green, and blue LEDs—to enhance hydrogen production efficiency under standard electrolysis conditions. Using NiFe electrodes in 30% KOH solution, experiments were conducted at 9 V and 1.5 A for 10 minutes, with each LED source (700 lumens) positioned 50 mm above the electrolyte. Hydrogen yield was recorded via a water displacement method, and temperature changes were monitored to assess photothermal effects. Results showed a significant improvement in hydrogen production under light exposure, with blue light yielding the highest output (17.85 mL), followed by green (13.15 mL), red (10.65 mL), and the non-irradiated control (8.15 mL). These enhancements are attributed to the synergistic effects of photon energy and thermal stimulation, which improve electrochemical kinetics. This study provides evidence that visible light can be an effective, low-cost method to boost hydrogen evolution performance in alkaline electrolysis systems.
EFFECT OF ADDITION FENNEL OIL AND TARTARIC ACID ON REGIME AND BURNING RATE OF CPKO DROPLETS Dwiantoko, Putra; Wardana, I.N.G; Wijayanti, Widya; Sasmoko, Sasmoko
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.2026.007.01.14

Abstract

This study examines the effect of combustion speed on crude palm kernel oil (CPKO) droplets with and without the addition of additives and catalysts to the mixture. As is known, the main component of CPKO is palmitic acid, which has a 16-carbon chain. This characteristic results in a relatively slow combustion rate of CPKO. In this study, the author added fennel oil as a bio-additive and tartaric acid as a catalyst to compare their effects on combustion speed. Fennel oil contains anethole, which has a conjugated cyclic ring capable of generating a magnetic field that can weaken the molecular bonds of CPKO. Meanwhile, tartaric acid acts as a catalyst that accelerates the combustion process due to its high electronegativity, which can disrupt the glycerol bonds in CPKO. The results of the study indicate a positive effect of adding fennel oil and tartaric acid as additives, with concentrations of 100, 200, and 300 ppm, on combustion speed.
THE EFFECT OF DIAMETER VARIATION ON THE COMBUSTION CHARACTERISTICS OF METHYL LAURATE AND METHYL OLEATE DROPLETS Saktyawan, Helmi; Santoso, Rangga; Yuliati, Lilis; Purnami, Purnami
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.2026.007.01.15

Abstract

The demand for fuel continues to increase while the availability of fossil fuel energy is decreasing day by day. This study aims to investigate the effect of diameter variation on the combustion characteristics of methyl laurate and methyl oleate droplets. Observations were made on the combustion characteristic of methyl laurate and methyl oleate droplets at the diameter variation stage. This research uses the experimental method (experimental research). The independent variables include diameters of 0.7 mm, 0.8 mm, 0.9 mm, 1.00 mm, 1.1 mm, and 1.2 mm. The fuels employed in this study were methyl laurate and methyl oleate. The observed dependent variables included ignition delay time, burning time, droplet temperature, droplet diameter evolution, and flame height. The findings obtained from the visualization of ignition delay time for methyl oleate with varying diameters revealed that it is more challenging to ignite than methyl laurate. Furthermore, the burning time of methyl oleate with different diameters was found to exceed that of methyl laurate. It was observed that the droplet temperature of methyl oleate increased to a greater extent than the droplet temperature of methyl laurate. Furthermore, the flame height of methyl oleate was found to be higher and exhibited greater variability, in contrast to the more stable behavior exhibited by methyl laurate. The fluctuation in the diameter of methyl oleate is in contrast to the stability exhibited by methyl laurate with regard to increasing droplet size.

Page 25 of 25 | Total Record : 249

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