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Journal of Mechanical Engineering Science and Technology
Published by Universitas Negeri Malang
ISSN : 25800817     EISSN : 25802402     DOI : 10.17977
Core Subject : Science, Engineering,
Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Mechanical Engineering Science and Technology (JMEST) is a peer reviewed, open access journal that publishes original research articles and review articles in all areas of Mechanical Engineering and Basic Sciences
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 25 Documents
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Search results for , issue "Vol 9, No 1 (2025)" : 25 Documents clear
Development of Power Management on Unmanned Surface Vehicles to Measure Battery Voltage and Power Alia, Diana; Nurdiansari, Henna; Gupron, Akhmad Kasan; Siregar, Amelia Greacy Talenta
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p001

Abstract

This research focuses on designing an electrical system for unmanned surface vehicles (USV) to ensure optimal performance during survey operations. This USV ship is a catamaran-type ship with a Sonar Deeper depth sensor to know the depth of the water and is equipped with long range (LoRa) as a data transmitter. The USV electrical system design incorporates the use of a 4050 mAh 11.1 V LiPo battery and an iMAX B6AC charger, with evaluations covering battery charging, power consumption, and voltage stability. The trials showed that the battery supported the operation of the USV for approximately 47.8 minutes at a power load of 45.08 Watts. Battery charging showed two main phases: constant current and constant voltage, with a full charge time of approximately 2.7 hours. During operation, voltage consumption showed significant fluctuations, highlighting the need for an electrical system design that maintains voltage stability to improve performance. From the test results, the battery efficiency was found to be 91.29%. These findings emphasize the importance of appropriate component selection and efficient power management to achieve reliable and efficient USV operation. With a deep understanding of the charging characteristics and power consumption, the designed electrical system can ensure more stable USV operation and better performance under various survey conditions.
Utilization of Biomass from Kerai Payung Trees and Waste Paper Through Pyrolysis Technology to Support the Zero-Waste Concept Indadari, Anggita Putri; Anisa, Nurfa; Santoso, Asih Budi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016vv9i12025p014

Abstract

Wisnuwardhana University is a private institution with a green campus environment surrounded by Kerai Payung trees. This environment produces organic waste from trees and inorganic waste such as used paper from campus activities. This study aims to achieve zero-waste processing by using pyrolysis technology to process campus waste, ensuring minimal residue. The experimental method involves comparing waste processing outcomes between conventional combustion and pyrolysis, the data was analyzed by comparing the results of pyrolysis with conventional combustion. The results of biochar from the pyrolysis process of used paper, Kerai Payung leaves, and nagging Kerai Payung tree are 76 g, 250 g, and 26 g. Then the results of ash from the pyrolysis process of used paper, Kerai Payung tree leaves, and nagging Kerai Payung tree are 23 g, 49 g, and 23 g. The results of liquid smoke from the pyrolysis process of used paper, Kerai Payung tree leaves, and nagging Kerai Payung tree are 75 mL, 50 mL, and 10 mL. Conventional combustion does not produce liquid smoke because the smoke from combustion is left to decompose in the air. This finding shows that pyrolysis is more effective than conventional combustion, because pyrolysis converts smoke into liquid, thereby reducing air pollution. In addition, the biochar and liquid smoke produced can be useful for agriculture and act as food preservatives, thus supporting sustainable waste management on campus.
Dynamic Analysis and Fatigue Life Evaluation of Single Herringbone Planetary Gear System with Crack Fault Sheng, Dongping; Yang, Jie; Su, Chun
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p026

Abstract

The herringbone planetary gear transmission is widely used due to its exquisite compact structure, excellent load-bearing capacity, and stable transmission characteristics. However, root crack is one of the most common failure modes of gears. A cracked herringbone planetary gear system is taken as research object. The sun gear with crack fault is studied from the aspect of modal and transient dynamic analysis, and the related results are compared with the healthy gear. Based on the transient dynamic analysis of the herringbone teeth with cracks, a fatigue life evaluation is conducted. Firstly, the results show that no significant difference between the natural frequencies and main vibration modes of healthy gears and faulty gears could be observed. Secondly, through transient dynamic analysis, it can be found that, during the rotation process of gears and with the increase of crack depth, the stress at the crack area increases gradually. As the crack penetration length increases, the stress at the crack endpoint of the gear increases almost linearly. Additionally, by comparing cracks with different depths and penetration lengths, the depth of the crack has a greater impact on the stress of the gear compared to the crack penetration length. Finally, based on the fatigue life analysis, the depth of the crack has a significant impact on the gear life; even if the depth of the crack is not very large, it will still have a significant impact. The related research is valuable and could guide the design and optimization of herringbone planetary gear system from the point of practical application.
Investigation of the Influence of Warhead Shape and Type of Missile Weapon Material Counter-Training Tank Weapons Simulation Approach Budiarta, Transisma; Puspito Buwono, Haris; Nurvian Amrullah, Radhi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p039

Abstract

This study analyzes the effect of warhead shape and material variations on pressure, temperature, and lift on training missiles using CAD-based simulation methods. The variations of warhead shapes tested include flat, flat radius, and tapered, while the materials used are rubber, ABS, and PE. The simulation results show that the tapered warhead shape with PE material produces the lowest pressure (50.3 MPa) due to more efficient pressure release and low friction properties. Conversely, the Flat shape produces the highest pressure (69.1 MPa) on all materials due to flow stagnation. In terms of temperature, the Flat Radius warhead with PE and Rubber materials has the lowest temperature (~335.56 K) due to flow expansion and low thermal conductivity, while the Tapered warhead with PE has the highest temperature (336.07 K) due to increased fluid velocity, which causes an adiabatic effect. In terms of lift, the tapered warhead with rubber shows the highest value (72.397) due to interaction with the turbulent boundary layer, while the flat radius warhead with rubber has the lowest lift (67.420) due to faster flow separation. These results can be applied in the optimization pf training missile design, jet warhead systems, and aerodynamic vehicles. Further development can include the exploration of alternative materials and the integration of advanced simulation technologies to improve the aerodynamic efficiency and durability of materials.
Harnessing the Role of Carbon Black: A New Frontier for Energy-Density Supercapacitor Electrodes Komariyah, Ana Yuli; Luthfiyah, Ishmah; Albadi’ah, Ida Vaeruza; Nasikhudin, Nasikhudin; Meevasana, Worawat; Diantoro, Markus
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p268

Abstract

The performance of activated carbon (AC)-based supercapacitor electrodes is often limited by poor electrical conductivity, prompting interest in conductive additives such as carbon black (CB). This study explores the transformative potential of CB as a conductive additive in AC-based supercapacitor electrodes and systematically investigates CB mass loadings of 0%, 5%, 10%, 15%, and 20%, using styrene-butadiene rubber (SBR) as the binder. The findings in this study demonstrate that 10% CB is the optimal loading, offering a balanced performance in terms of structure, morphology, and capacitance. X-ray diffraction (XRD) analysis reveals a distinct structural evolution at 10% CB, characterized by the exclusive emergence of a (100) peak at 43° 2θ, which indicates the formation of dense graphene-like layers and enhanced π-π electron delocalization. This promotes the formation of robust conductive networks, reducing electrode resistivity by 72%. Morphological and specific surface area characterization confirms the uniform particle distribution of an ultra-thin electrode AC-10% CB (26.5 μm) with a high surface area of 851.84 m²/g; this maximizes ion-accessible active sites and minimizes diffusion pathways. These combined effects result in a specific capacitance of 61.33 F/g, representing a 12% improvement over the pristine electrode (56.36 F/g) and 89.87% capacitance retention after 50 cycles. These results highlight the importance of optimizing CB loading: Lower concentrations (
Performance of Rice Grain Conveyor Vacuum Blower with Variations in the Number and Shape of Impeller Angles Suwandi, Dedi; Sifa, Agus; Endramawan, Tito; Sumeru, Kasni
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p154

Abstract

Separating rice and bran, moving rice to storage, and other processes related to moving grain or rice. In the modern rice milling industry, the process of transferring grain material already uses a pneumatic conveying system; a vacuum blower system for transferring grain is needed when milling grain to become rice. The research method used to obtain the shape of a vacuum blower with strong inlet suction power and outlet thrust is carried out by Computational Fluid Dynamics simulation and testing several types and variations in the number of blades. Simulation of forward curved blade type impellers, backward curved blade, and straight radial blade with variations in the number of 8, 10, and 12 blades. From the impeller simulation, it was obtained that the straight radial blade with 8 blades was the best. The best impeller types were made using the manual method. Measurement results were on the straight radial blade type impeller with 8 blades, with a motor speed of 1,000 rpm; the results of measuring air speed at the inlet were 34.95 m/s and at the outlet 23.08 m/s. In addition, the difference in the results between in simulation and the experiment is due to the fabrication process and air leaks.
Analyzing the Performance of a Solar-Assisted Grain Dryer Parenden, Daniel; Sumbung, Frederik H.; Sahupala, Peter
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p215

Abstract

This study evaluates the drying performance and energy efficiency of a solar-powered rice cabinet dryer equipped with two distinct airflow mechanisms: free convection (chimney-assisted) and forced convection (fan-assisted). Field experiments were conducted under tropical conditions in This study evaluates the drying performance and energy efficiency of a solar-powered rice cabinet dryer equipped with two distinct airflow mechanisms: free convection (chimney-assisted) and forced convection (fan-assisted). Field experiments were conducted under tropical conditions in Merauke, Indonesia, comparing drying efficiency, moisture reduction, and air mass flow across three rice grain loads: 1 kg, 3 kg, and 5 kg. The experimental design incorporated both thermal analysis and statistical evaluation (ANOVA and t-tests) to assess the effects of airflow method and grain weight on drying outcomes. Results indicate that the chimney system demonstrated more stable and efficient performance at lower grain weights (1–3 kg), with range efficiency of 32.07% - 37.5% compared to 28.26% - 32.67% using the fan-assisted method. Drying efficiency increases with grain load, reaching a maximum of 43.75% for chimney-assisted drying and 43.44% for fan-assisted drying at 5 kg. However, the fan-assisted system provided superior performance at higher loads due to improved heat and moisture transfer. Although the fan method yielded faster drying rates and more effective moisture reduction, it exhibited slightly greater variability. Despite limitations related to experimental scale and real-time solar radiation monitoring, the findings confirm that solar-powered cabinet dryers—especially those with adaptive airflow control—offer a cost-effective, energy-efficient, and scalable drying solution for smallholder rice producers. Future work should prioritize scaling up capacity, integrating hybrid energy sources, and automating temperature regulation to enhance system performance under fluctuating weather conditions
Performance Analysis of Alkaline Fuel Cell with Variation of Potassium Hydroxide Concentration in Electrolyte Solution Alfariz, Mohammad Rifqy; Ilminnafik, Nasrul; Djumhariyanto, Dwi; Hardiatama, Intan; Ibnu, Muhammad Khadafi; Nugraha, Raafi Aditya; Freitas, Domingos de Sousa
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p103

Abstract

Alkaline Fuel Cell (AFC) is a green energy conversion tool that converts chemical energy into electrical energy through electrochemical reactions. This research aims to analyze the effect of potassium hydroxide (KOH) concentration variation in electrolyte solution on the AFC performance, using nickel and manganese catalysts. The research methods include experiments using various KOH concentrations to determine the optimal concentration to produce the best AFC performance. The voltage and current produced are measured, as well as the calculation of the electrical power and efficiency of the AFC. The results showed that KOH concentration has a significant influence on the performance of AFC. It was found that the optimal KOH concentration produces maximum electrical power and energy conversion efficiency. The highest alkaline fuel cell performance was found at 70% KOH concentration. In addition, the use of nickel and manganese catalysts was shown to improve the stability and efficiency of AFC. The result makes an important contribution to the development of AFC technology, supporting global efforts towards cleaner and more sustainable energy use. The findings also provide a basis for further innovations in AFC design and materials, as well as their potential in practical applications such as electric vehicles and portable power plants
Surface Analysis of Bacterial Cellulose Membrane Made from Biowaste Added with ZnO Nanopowder Amasda, Naufal Rizky; Suryanto, Heru; Yanuhar, Uun; Aminnudin, Aminnudin; Nusantara, Fajar; Sias, Quota Alief
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p281

Abstract

Utilization of pineapple biowaste is important to increase the value added to biowaste and solve the environmental problem. So, the study objective is to synthesize membranes of bacterial cellulose made from pineapple biowaste and characterize the surface morphology and porosity of the membrane after being added with ZnO nanopowder. The study starts with extracting biowaste as a bacterial cellulose culture medium for the fermentation process. The obtained pellicle was crushed and homogenized with the added ZnO nanopowder in the presence of ultrasonic waves. The membrane is dried in the oven. The membrane morphology was monitored using scanning electron microscope and Brunauer–Emmett–Teller analysis. Results indicate that surface morphology more rougher in line with increasing ZnO nanopowder content. The control membrane exhibits the highest surface area (36.9605 m²/g) due to its uninterrupted porous network. The addition of ZnO nanopowder at 2.5% significantly reduces the surface area to 2.9168 m²/g, likely due to nanoparticle-induced pore obstruction. As the ZnO nanopowder concentration increases to 5% and 7.5%, the specific surface area rises to 8.0436 m²/g and 13.7783 m²/g, respectively. This trend suggests that higher ZnO nanopowder loading enhances porosity and introduces additional adsorption sites. The control BC membrane exhibits the highest pore volume and well-defined mesoporosity, which are diminished upon the initial addition of ZnO nanopowder.
Characterization of Bamboo Petung Fiber Reinforced Composites with Environmentally Friendly Enzymes Raharjo, Rudianto; Widodo, Teguh Dwi; Bintarto, Redi; Alamsyah, Fikrul Akbar
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i1p165

Abstract

Natural fiber composites are a good choice for many businesses uses because of their better mechanical properties and are friendly environment. Researchers are currently looking into bamboo petung fiber (BPF) and epoxy composites as alternative to synthetic fibers and products made from petroleum. This study's goal is to improve the overall performance of these composites while reducing the need for non-organic materials. This study used the various concentration of bromelain enzyme in BPF to changes the mechanical and physical properties of epoxy composites made from BPF. Composites were characterized the mechanical properties including tensile strength using tensile tester, impact strength using Charpy impact test, bending strength using three point bending methods, and surface morphology observation using scanning electron microscope. This study indicates that BPF composites that have been treated with bromelain enzyme have better mechanical properties. After being treated with bromelain, the BPF composite's tensile strength increase up to 59% with maximum tensile strength of 138.230 MPa, flexural strength increases up to 42% with maximum flexural strength of 135.58 MPa, and impact strength increases up to 64% with maximum impact strength of 4.88 J/m. The bond between the epoxy resin and the BPF makes the composite stronger. These results suggest that combining natural fibers and enzymes can make composite materials that work well and are strong.

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