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Firman Yasa Utama
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INDONESIA
Indonesian Journal of Engineering and Technology (INAJET)
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 26232464     DOI : http://dx.doi.org/10.26740/inajet
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering
Indonesian Journal of Engineering and Technology (INAJET) is a scientific journal that publishes peer-reviewed research papers in the fields of Engineering and Technology, both theoretical, experimental, and application studies, including: Electrical Engineering, Mechanical Engineering, Informatics, Industrial Engineering, Civil Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 7 No. 2 (2025): April 2025" : 5 Documents clear
Effect of Post-Welding Heat Treatment on ASTM A36 Steel on Tensile Strength Bachrun, M. Thabrani; Hafizh Ainur Rasyid, Akhmad
Indonesian Journal of Engineering and Technology (INAJET) Vol. 7 No. 2 (2025): April 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v7n2.p36-41

Abstract

Riding comfort is greatly influenced by the strength and stability of the motorcycle, one of which is the Engine Arm component that connects the frame and the engine.One important factor is the swingarm, which is designed to withstand loads and torsional stiffness.This study aims to examine the effect of air, sand, and furnace cooling media on the SMAW welding of ASTM A36 steel on tensile strength and microstructure after Post Weld Heat Treatment at a temperature of 780°C with a holding time of 60 minutes.The research uses experimental methods with tensile testing to measure tensile strength and strain, as well as microstructural analysis to observe phase changes in the weld metal and Heat Affected Zone (HAZ).The tensile test results show that the air cooling medium produced the highest tensile strength (268.8 MPa) and an average elongation of 8.95%, while the sand medium produced the lowest tensile strength (265.77 MPa) with an elongation of 8.25%.Microstructural analysis revealed that in specimens with sand cooling media, the ferrite phase is dominant, providing toughness, whereas in air cooling media, there is a ferrite phase but with a slight presence of martensite phase structure, resulting in a structure that is soft yet somewhat hard.The research results show that faster cooling media increase tensile strength and alter the microstructure of ASTM A36 steel.
DESIGN OF WIND POWER PLANTS USING SAVONIUS-DARRIEUS TURBINES WITH MAGNETIC POLE GENERATORS Okvani, Ahmad; Firman Yasa Utama
Indonesian Journal of Engineering and Technology (INAJET) Vol. 7 No. 2 (2025): April 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v7n2.p42-50

Abstract

The utilization of wind energy as a renewable energy source presents a strategic solution to address the limitations of fossil fuel resources and the growing demand for energy. This study aims to design and test a hybrid Savonius-Darrieus Wind Power Plant (WPP) prototype equipped with a variable magnetic pole generator to optimize the conversion of fluctuating wind energy into electrical energy. The research method employed is Research and Development (R&D), comprising stages of literature review, 2D and 3D design, prototype assembly, and functional testing conducted in the coastal area of Kenjeran Beach, Surabaya. The testing involved variations in the number of magnetic poles (2 and 4) and pulley ratios (2:1 and 3:1), using an anemometer and multimeter for measurement. The results of the study produced a complete design of the Savonius-Darrieus WPP prototype with a length of 100 cm, a width of 100 cm, and a height of 80 cm. The generator used is a permanent magnet generator based on an AC fan motor dynamo type YYW25-6-17004L, utilizing coin-type neodymium magnets with a diameter of 1 cm and a thickness of 0.6 cm.
Comparative Study of Structural Strength in the Selection of VU-EV Car Chassis Materials (Vokasi Unesa-Electrical Vehicle) Using Solidworks 2020 Software Muhamad Nahrudin Ibad, Ibad; Ferly Isnomo Abdi; Firman Yasa Utama; Ganda, Andita
Indonesian Journal of Engineering and Technology (INAJET) Vol. 7 No. 2 (2025): April 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v7n2.p51-55

Abstract

The development of electric cars in recent years has changed very rapidly. The Vocational Faculty of Surabaya State University also wants to develop an electric car in the form of a golf car that is efficient and energy efficient. The chassis is one of the important parts of an electric car that functions as a support for the weight of the car. A simple and lightweight chassis design is one of the factors in saving energy, because the lighter the vehicle, the less power is used to move the vehicle. The selection of chassis materials is also very important because it affects the strength of the chassis and the weight of the chassis. Three materials are considered for making the chassis, namely; aluminum 6061-T6, AISI 4130 steel, and AISI 1020 steel. Structural strength testing uses a load pressure of 1500 N on the front of the chassis, 4000 N on the middle of the chassis, and 3000 N on the rear of the chassis. Structural analysis of the chassis using the FEA (Finite Element Analysis) method using Solidwork 2020 software. In the structural strength test, the stress and displacement values ​​of each material were known: aluminum 6061-T6 = 7.251 Mpa and 0.199 mm, AISI 4130 steel = 10.815 Mpa and 0.065, and AISI 1020 steel = 11.151 Mpa and 0.065 mm.
Design of a Ladder Frame Chassis Made from Aluminum Alloy Hollow Material Used by the GARNESA Energy-Efficient Car Team with Static Testing Baihaqi, Muhammad Baihaqi Nur; Firman Yasa Utama
Indonesian Journal of Engineering and Technology (INAJET) Vol. 7 No. 2 (2025): April 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v7n2.p56-61

Abstract

This study focuses on designing a ladder frame chassis for energy-efficient cars made of Hollow Aluminum Alloy. The chassis functions as the main supporting structure that must be able to withstand vehicle loads effectively, including static loads from the steering, driver, engine, and battery, as well as dynamic loads that arise while driving. The design process involves an in-depth analysis of the dimensions and strength of the material to achieve a stable, minimalist, and aerodynamic design. Testing is carried out to evaluate the strength of the chassis through static test methods. The method used is an experimental method where the work on the tool starts from the design which includes: observation, tool design and function testing. The results of the chassis design have final dimensions of 1740.40 mm (length) x 780 mm (width) x 876.20 mm (height), while the results of static testing obtained the highest deflection results of 0.2 cm with a safety factor of 7.29 ul, for the moment of inertia obtained a value of 996730.62 mm4, and for von mises stress 37.77 Mpa. These findings indicate that the designed chassis meets the safety and performance criteria required for energy-efficient cars, so it can be implemented in KMHE and SEM competitions.  Keyword: Chassis Ladder Frame, Energy Efficient Car, Urban Concept, Static Test.  
Fault Analysis and Handling in Low-Voltage Networks at PT. PLN (Persero) UP3 Sidoarjo ULP Krian Ibrohim, Ibrohim; Muhammad Roihan Amir
Indonesian Journal of Engineering and Technology (INAJET) Vol. 7 No. 2 (2025): April 2025
Publisher : Fakultas Teknik Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/inajet.v7n2.p62-69

Abstract

Low-voltage electricity distribution networks have an important role in ensuring a reliable electricity supply for the community because they are directly connected to customers. However, this network is prone to disturbances due to natural factors such as extreme weather and external disturbances such as fallen trees, wild animals, and human activities. This study aims to identify the types of disorders that commonly occur and evaluate the effectiveness of the handling procedures implemented by PT PLN (Persero) UP3 Sidoarjo ULP Krian. The method used is qualitative descriptive through direct observation in the field with the PLN technical team. The results of the study showed that the most dominant disturbances were caused by strong winds, heavy rain, and cable connection disruptions. Handling procedures start from identifying the location of the fault through customer reports, technical checks using measuring instruments such as ampere pliers and tespen, to corrective actions and evaluations. In addition, the aspect of occupational safety is also a major concern in each stage. Evaluation of the system is carried out post-repair to ensure there is no potential for further disruption. In conclusion, the reliability of the distribution network can be improved through systematic handling procedures, periodic maintenance, and active participation of the community. This study provides a practical overview of the importance of network disruption management as part of efforts to improve the quality of national electricity services.  Keywords: Power outage, Distribution network, System reliability, Technical handling

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