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All Journal Indonesian Journal of Engineering and Technology (INAJET) Diversity Logic Journal Multidisciplinary
Firman Yasa Utama
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences

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FUNCTIONAL TESTING OF THE VARIABLE GEOMETRY SUSPENSION (VGS) PROTOTYPE ON BUMPY ROAD CONDITIONS Murti, Dafa Aditya; Huda, Miftachul; Abdi, Ferly Isnomo; Wulandari, Diah; Firman Yasa Utama
DIVERSITY Logic Journal Multidisciplinary Vol. 2 No. 3 (2024): December: Diversity Logic Journal Multidisciplinary
Publisher : SYNTIFIC

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61543/div.v2i3.107

Abstract

Background. Modern vehicles must prioritize comfort and safety, including the suspension system. While passive suspension systems are common, they struggle with excessive vibrations on uneven roads. Semi-active and active systems address this but are costly and complex. To solve this, a Variable Geometry Suspension (VGS) prototype was developed, integrating an active actuator into a passive system to adjust its geometry, providing performance comparable to active suspension systems. Research Purpose. This study aims to examine the effect of single-link angle variations in the Variable Geometry Suspension (VGS) prototype on bumpy roads to determine the most comfortable single-link angle. Research methods. This research employs a Research and Development (RnD) method by testing the single-link angle at 0°, 90° (reference angle), and 180°. Data collection was conducted by introducing road disturbances in the form of a bumpy road. Findings. The testing results showed that the lowest Root Mean Square (RMS) value of the sprung-mass was at a single-link angle of 90°, with an RMS value of 0.72 m/s². This indicates a "Fairly Uncomfortable" level based on ISO 2631, with the damper on the unsprung-mass (ct) and tire stiffness (kt) disregarded, as well as the weight of the sprung-mass. Conclusion. The VGS prototype's response to changes in the single-link angle on bumpy roads varies. However, the system effectively reduces vibrations at all angles, stabilizing the vehicle's body (sprung-mass) as the wheel (unsprung-mass) moves over uneven surfaces.
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.  
Co-Authors Baihaqi, Muhammad Baihaqi Nur Diah Wulandari Fachry Abda El Rahman Ferly Isnomo Abdi Ganda, Andita Muhamad Nahrudin Ibad, Ibad Murti, Dafa Aditya Okvani, Ahmad