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jes
Published by Yayasan Kawanad
ISSN : 28288106     EISSN : 2828805X     DOI : https://doi.org/10.56347/jes
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering
The Journal of Engineering Science is not limited to a specific aspect of science and engineering but is instead devoted to a wide range of subfields in the engineering sciences. While it encourages a broad spectrum of contribution in the engineering sciences, its core interest lies in issues concerning material modeling and response. Articles of interdisciplinary nature are particularly welcome. All published article URLs will have a digital object identifier (DOI).
Arjuna Subject : Teknik (semua kategori) - Teknik Kontrol dan Sistem
Articles 5 Documents
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Search results for , issue "Vol. 4 No. 2 (2025): December" : 5 Documents clear
Design and Fabrication of a Hydraulic Transmission Jack for Heavy-Duty Truck Maintenance Van Anh, Nguyen; Mai, Hoang Thi
Journal of Engineering and Science Vol. 4 No. 2 (2025): December
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v1i2.109

Abstract

This study presents the design, fabrication, and testing of a hydraulic transmission jack specifically tailored for lifting and handling truck transmissions in automotive repair facilities. The device utilizes a foot-operated hydraulic system to provide efficient and safe lifting capabilities, addressing the ergonomic and safety challenges associated with manual handling of heavy transmissions during removal and installation procedures. Through systematic design calculations, material selection, structural analysis, and prototype assembly, the jack achieves a lifting capacity of 2000 kg with a height adjustment range of 190–810 mm, suitable for medium to heavy-duty truck applications. Comprehensive performance testing demonstrated reliable operation under maximum load conditions, with no structural failure, hydraulic leakage, or stability issues observed during extended hold tests and offset load scenarios up to 1500 kg. The prototype was fabricated at approximately $300, representing 35–50% cost savings compared to commercially available models while maintaining comparable performance characteristics. The foot-pedal hydraulic operation enables hands-free lifting with controlled positioning, significantly reducing physical strain on mechanics and potentially decreasing workplace injuries. Stability tests confirmed adequate resistance to tipping under asymmetric loading conditions, while the 45 kg overall weight and caster-mounted base provide acceptable portability for workshop environments. This innovation contributes to advancing mechanical engineering applications in vehicle maintenance by demonstrating that effective ergonomic solutions can be achieved through practical design approaches using readily available materials and components, making specialized lifting equipment more accessible to small-scale repair facilities, particularly in developing economies where capital investment constraints limit access to commercial equipment.
Prediction of Fatigue Life of Coil Springs and Lower Suspension Arms Based on Strain-Life Approach Lim, Sokha
Journal of Engineering and Science Vol. 4 No. 2 (2025): December
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v1i2.110

Abstract

This study predicts the fatigue life of helical coil springs and lower suspension arms in automotive suspension systems using the strain-life approach. The strain-life method, which incorporates local plastic strain effects, is particularly suitable for components experiencing variable amplitude loading under road-induced vibrations. Finite element analysis (FEA) was employed to determine critical strain locations and magnitudes under typical loading conditions. Fatigue life was estimated using the Coffin-Manson relation, with mean stress corrections via the Morrow and Smith-Watson-Topper (SWT) models. Results indicate that coil springs exhibit fatigue lives ranging from 10⁵ to 10⁶ cycles under rural road excitations, while lower suspension arms show shorter lives at high-stress regions due to multiaxial loading. The findings highlight the importance of material selection and geometry optimization for improved durability in automotive applications
Fatigue Life Prediction Of Minibus Lower Suspension Arm Using Strain-Life Approach Anh, Nguyen Thi Mai; Đức, Phạm Văn
Journal of Engineering and Science Vol. 4 No. 2 (2025): December
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v4i2.276

Abstract

The lower suspension arm is a critical component in vehicle suspension systems that experiences complex dynamic loads during operation. This study aims to predict the fatigue life of minibus lower suspension arms using a strain-life approach considering road conditions in Southeast Asia. The finite element method was employed to analyze stress and strain distributions on the component, while fatigue failure criteria were applied to predict component life. Simulations were conducted using ANSYS software with Al-Si aluminum alloy material commonly used in suspension components. Analysis results showed that maximum stress occurred at the bushing joint area with a value of 245 MPa, and fatigue life was predicted to reach 1.2 × 10⁶ cycles for rough road conditions. Sensitivity analysis indicated that road roughness and joint geometry have significant influences on component fatigue life. This research contributes to design optimization and material selection to enhance lower suspension arm durability under tropical operating conditions.
Implementation of Column Formwork Works on the 10th Floor in the Construction of Sky House Alam Sutera Phase 3 Building Ghani Leo Frando; Mulya, Eka Sasmita
Journal of Engineering and Science Vol. 4 No. 2 (2025): December
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v4i2.309

Abstract

Formwork is a crucial component in reinforced concrete structural works. This study specifically discusses the application of aluminum formwork for column elements in high-rise buildings. Time inefficiency and quality issues encountered when using wooden or conventional formwork are major problems frequently found on construction sites. This study aims to identify the advantages and disadvantages of using aluminum formwork for columns and to evaluate its impact on construction time and the quality of the resulting product. The research employed a qualitative descriptive approach through direct observation and interviews with workers and project managers at the Sky House Alam Sutera Phase 3 building project. The results show that aluminum formwork can be installed and dismantled faster than wooden formwork, and it produces a smoother and more precise concrete surface. However, aluminum formwork has a higher initial procurement cost. Nevertheless, it is more cost-effective in the long term if properly maintained and reused multiple times. Due to its efficiency, neatness, and durability, aluminum formwork is a suitable choice for high-rise building projects.
Transformer Oil Failure Analysis Based on Dissolved Gas Analysis (DGA) Test Using Breakdown Voltage and Fuzzy Logic Methods Lubis, Rakhmad Syafutra; Akbar, Muhammad Hafizh; Siregar, Ramdhan Halid; Masri, Masri
Journal of Engineering and Science Vol. 4 No. 2 (2025): December
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v4i2.381

Abstract

A common problem that occurs in transformers is failure of the insulating oil. One solution to prevent this disruption is to analyze indications of insulating oil failure. Several previous studies on the analysis of transformer insulating oil failure were based on dissolved gas content tests of transformer oil samples. The research was conducted using several methods in processing dissolved gas test results data, such as the TDCG (Total Dissolved Combustible Gas), Roger's Ratio, and Duval's Triangle methods. In this study, two methods were used for comparison, namely the Breakdown Voltage method and the Fuzzy Logic method. The results obtained show that the condition of the insulating oil using fuzzy logic in the Matlab simulation is in accordance with the condition of the transformer insulating oil based on its breakdown voltage characteristics, namely in a normal state. Meanwhile, gas content that is at a high or very high level has a significant impact on the indication of failure in transformer insulating oil, namely the concentration of TDCG and nitrogen gas content.

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