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All Journal Indonesian Journal of Engineering and Technology (INAJET) Jurnal Otoranpur Diversity Logic Journal Multidisciplinary Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri
Firman Yasa Utama
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology 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.  
Pembuatan Lengan CNC Router Gantry 350x170x12 mm Komposit Epoxy-Pipa Aluminium, Kapasitas 0,19 Unit/Jam Firman Yasa Utama; Syamsul Hadi; Fabio Canavaro Brian Irawan; Eky Sukma Nurillah; Mochammad Alfin Ardian Syah; Ali Hasbi Ramadani; Nur Aini Susanti
Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri Vol. 4 No. 2 (2026): Manufaktur : Publikasi Sub Rumpun Ilmu
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/manufaktur.v4i2.1398

Abstract

The heavy weight of the 3-axis router gantry arm and the high cost of manufacturing are the problems faced. The purpose of manufacturing is to obtain low weight and manufacturing costs. The method of manufacturing the router gantry arm includes: design of the arm with a width of 350, a height of 170 mm, a thickness of 12 mm; making a composite mold of the gantry arm measuring 350 × 170 × 12 mm from wood; preparation of 5 pieces of Aluminum pipes as reinforcement with a diameter of 6 mm, a length of 120 mm and 140 mm which are bent to the side in the router shaft section; composite molding with epoxy resin and aluminum pipe reinforcement arranged parallel with a distance of 30 mm from each other in an upright position, except for the position where the hole is bent to the side; making a Router shaft hole with a diameter of 20 mm and other binding holes with a diameter of 10 mm and 6 mm; and quality and dimension inspection. The manufacturing results are a router gantry arm with a width of 350, a height of 170 mm, a thickness of 12 mm with a weight of about 680 g or 44.90% lighter than solid aluminum material; The total manufacturing cost is IDR 108.125/unit, and the production process duration is 310 minutes/unit, which implies that the weight of the pole arm is reduced to around 55% compared to solid aluminum material and the price is cheaper by one-third.
KARAKTERISASI FISIK DAN MEKANIK BIO-KOMPOSIT COCOPEAT PADA SISTEM REM CAKRAM NISSAN NAVARA KENDARAAN DINAS TNI-AD Nafi', Maftuh; Lalu Saefullah; Sugeng Hadi Susilo; Firman Yasa Utama
Jurnal Otoranpur Vol. 5 No. 1 (2024): Jurnal Otoranpur
Publisher : Pustaka Poltekad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54317/oto.v5i1.909

Abstract

Penggunaan material komposit berbasis bahan alami seperti cocopeat dalam industri otomotif semakin menarik perhatian, terutama dalam aplikasinya pada sistem pengereman. Penelitian ini bertujuan untuk menganalisis karakteristik fisik dan mekanik bio-komposit cocopeat yang diaplikasikan pada sistem rem cakram kendaraan Nissan Navara milik TNI-AD. Komposit yang digunakan terbuat dari campuran cocopeat dan resin epoxy dengan berbagai komposisi. Hasil penelitian menunjukkan bahwa komposit dengan 30% cocopeat memiliki kinerja pengereman yang stabil dengan koefisien gesek 0,3 N/mm³ pada suhu lingkungan dan 0,25 N/mm³ pada suhu tinggi. Keausan material pada komposit ini juga terbilang rendah, menjadikannya alternatif yang menjanjikan untuk pengganti material konvensional pada kampas rem.
Co-Authors Ali Hasbi Ramadani Baihaqi, Muhammad Baihaqi Nur Diah Wulandari Eky Sukma Nurillah Fabio Canavaro Brian Irawan Fachry Abda El Rahman Ferly Isnomo Abdi Ganda, Andita Lalu Saefullah Mochammad Alfin Ardian Syah Muhamad Nahrudin Ibad, Ibad Murti, Dafa Aditya Nafi', Maftuh Nur Aini Susanti Okvani, Ahmad Sugeng Hadi Susilo Syamsul Ph.D M.A. Hadi