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Agus Widyianto
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Journal of Automotive and Mechanical Applied Technology
Published by Universitas Negeri Yogyakarta
ISSN : -     EISSN : 30897793     DOI : https://doi.org/10.21831/jamat.v1i1
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Focus and Scopes The Journal of Automotive and Mechanical Applied Technology (JAMAT) is dedicated to disseminating original research, reviews, and case studies that contribute to the advancement of automotive engineering and mechanical technology. The journal provides a platform for academics, researchers, and practitioners to share innovative ideas, methodologies, and applications in the fields of automotive and mechanical engineering. Scope Areas: Automotive Engineering Advanced vehicle design and development. Powertrain and propulsion technologies (internal combustion engines, hybrid, and electric vehicles). Automotive safety systems and crashworthiness. Autonomous and connected vehicle technologies. Vehicle dynamics, control systems, and diagnostics. Mechanical Engineering Applications Design, analysis, and manufacturing of mechanical systems. Thermodynamics, fluid mechanics, and heat transfer applications. Computational methods and simulations in mechanical engineering. Material science and advanced manufacturing techniques. Robotics and mechatronics. Applied Technologies Integration of Industry 4.0 in automotive and mechanical sectors. Sustainable and green technologies for mechanical and automotive systems. Maintenance and reliability engineering. Applications of AI and machine learning in automotive and mechanical fields. Focus: The journal accepts contributions from a wide range of sectors, including but not limited to: Academic research institutions. Automotive and mechanical industries. Governmental and non-governmental organizations involved in technology development. Articles can focus on theoretical studies, experimental research, applied projects, and reviews of emerging technologies. Submissions are encouraged to explore innovations, problem-solving techniques, and practical implementations that impact the industry and society.
Arjuna Subject : Teknik (semua kategori) - Teknik Otomotif
Articles 28 Documents
 1   2   3 
Design and finite element analysis of a portable bus service ramp to reduce dependence on service pits Novian Dhamas Ramadhan; Muhammad Alfarizi; Agus Widyianto
Journal of Automotive and Mechanical Applied Technology Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v2i2.2479

Abstract

This study aims to: (1) design and analyze a portable ramp to improve bus repair efficiency at PT. United Tractors Semarang Branch, (2) with a focus on facilitating repairs and reducing dependence on service pits. (3) This portable ramp is expected to overcome access constraints to the underside of buses, speed up repair time, and improve work safety for mechanics. This study uses the DMADV (Define, Measure, Analyze, Design, Verify) method to develop portable ramps. These stages include problem discovery, technical data collection, analysis of materials, 3D model design using SolidWorks, and verification using Finite Element Analysis (FEA) to ensure structural strength and compliance with safety standards. This study successfully designed and analyzed a portable ramp for bus repairs, capable of withstanding an operational load of 88,750 Newtons with a safety factor≥ 3.0, a maximum deformation of ≤ 5 mm, and a safe von Mises stress distribution. The selection of ASTM A36 Carbon Steel resulted in optimal strength and weight, as well as cost efficiency. The ramp design also meets workshop operational needs and improves repair process efficiency. This research successfully designed an optimal portable ramp for the PT. United Tractors Semarang Branch Workshop, considering operational efficiency and safety, ASTM A36 Carbon Steel was selected as the best material based on strength, weight, and cost. It is recommended to implement this portable ramp, along with technician training, maintenance system development, and expansion to other branches, to improve bus repair efficiency.
Performance analysis of rear under run protection device (RUPD) on truck based on vehicle safety standards in Indonesia Ethys Pranoto; Edi Purwanto
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.2742

Abstract

The rear under-run protection device is an apparatus installed on goods vehicles with a rear section that is more than 700 millimeters above the road surface. The height disparity between two vehicles may lead to the passenger compartment of a smaller vehicle colliding with and sliding under the chassis of a larger vehicle. This device is mounted to reduce the risk of fatalities resulting from rear-end collisions. This study aims to evaluate the design of rear under-run protection devices on goods vehicles to determine whether they meet the prerequisites set forth in the applicable Indonesian regulations. This is achieved by conducting modeling and testing simulations using software based on the finite element method. The evaluation results indicate that the underrun protection design satisfies several required technical criteria; however, non-conformities remain in structural dimensions and joint integrity, including a cross-member height of 80 mm (< 100 mm), a member length of 2200 mm (< 2300 mm), a cross-bar deflection reaching 419.5 mm (exceeding the ≤ 400 mm limit), and the use of welded joints instead of the required bolt–nut connections. Consequently, structural and mounting system modifications are necessary to achieve full compliance with the applicable standards.
ArUco Marker-Based autonomous UAV navigation for reconnaissance operations in urban terrain environments Cahya Pradika; Imanuel Dindin; Erzi Agson Gani; Ardan Nagra Coutsar; Mochamad Riza Pratama
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3018

Abstract

This study demonstrated the feasibility of autonomous UAV navigation in GPS-denied indoor environments using ArUco marker-based visual localization integrated with a VL53L1X LiDAR sensor and PX4 Offboard control. The developed system successfully validated markers, performed real-time pose estimation, and navigated sequentially through waypoints without human intervention. The web-based monitoring interface and QGroundControl integration operated reliably throughout all trials, enabling effective dual-platform telemetry monitoring and manual setpoint adjustment from a safe standoff position. The ArUco-marker-based detection, implemented using the OpenCV DICT_5×5_250 dictionary, validated marker identities within a functional altitude range of 40 to 200 cm. Third, across 61 trials discrete movement samples spanning four path configurations—straight-axis, lateral-right, lateral-left, and compound multi-direction—the system achieved an overall navigation success rate of 70%. Navigation failures caused by synchronization lag between UAV translational velocity and the camera’s image processing frame rate, which prevented timely marker validation during high-speed maneuvers. These results confirm that ArUco marker-guided UAV navigation is a viable, low-infrastructure solution for initial indoor reconnaissance in GPS-denied military environments, and establish a quantitative baseline for future enhancements, including precision landing algorithms and dynamic marker placement strategies.
Engineering design and performance validation of a low-cost diesel common rail injector test bench Wedhar Adi Wiratama; Zainal Arifin; Sudarwanto; Ware-Ebi Guwor-Niki Jesse
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3028

Abstract

High-pressure common rail (HPCR) systems are essential in modern diesel engines to meet performance and emissions requirements. However, commercial injector test benches remain costly for vocational laboratories and small-scale workshops. This study designs, develops, and preliminarily validates a low-cost diesel common rail injector test bench using the ADDIE (analysis, design, development, implementation, and evaluation) framework. The system integrates a repurposed Chevrolet Captiva high-pressure supply pump driven by a 1 hp AC motor, a high-pressure fuel circuit, and an Arduino Nano-based electronic control unit (ECU) that applies pulse-width modulation (PWM) to control pulsed injector actuation. Validation was performed using a Denso Hino RN285 injector at low, medium, and high operating stages. The bench generated rail pressures from 360 bar (36 MPa) to 850 bar (85 MPa) and delivered 18.0 to 39.0 mL of fuel over a 20 s collection window. The measured delivery volume at low and medium speeds remained within the manufacturer’s tolerance after interpolation to the actual measured rpm. In contrast, a delivery deficit was observed at the highest speed. Quantitative spray-image analysis yielded spray angles of 15.38-20.44 degrees, within the specified range. The results indicate that the developed bench is a functional laboratory-scale platform for injector diagnostics and vocational training, although further benchmarking against calibrated commercial equipment and long-term durability testing are still required.
Performance evaluation of a modified LED motorcycle headlamp with an acrylic optical limiting plate Dwi Prasetyo; Beni Setya Nugraha; Ayu Sandra Dewi; Ruolan Li; Dangshe Qiu
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3029

Abstract

Nighttime riding safety depends strongly on headlamp performance, especially for motorcycles operating in road environments with limited street lighting. Conventional halogen lamps are widely used but place a relatively high electrical demand and thermal load on the system. This study experimentally evaluates a modified 12 W light-emitting diode (LED) motorcycle headlamp equipped with a 3 mm acrylic optical limiting plate to improve beam control and reduce upward light scatter. A Honda Supra 125 FI with a 12 V direct-current electrical system was used as the test platform. The final quantitative comparison was limited to a standard 35 W halogen lamp and a modified LED configuration with an acrylic shield/baffle. Luminous intensity was measured at 1 m and 5 m, electrical current was measured under direct-current operating conditions, and surface temperature was monitored during a 75 min continuous operation test. The modified LED system produced 1342 lux at 1 m and 170 lux at 5 m, exceeding the halogen values of 1240 lux and 124 lux, respectively. The LED configuration reduced current draw from 2.92 A to 1.00 A and decreased peak operating temperature from 278 °C to 100 °C. The acrylic limiting plate produced a more clearly bounded beam pattern in qualitative projection tests; however, the present study does not claim full glare elimination because standard glare indices and complete photometric mapping were not measured. These results indicate that the proposed LED retrofit can improve energy efficiency and thermal behavior while providing better preliminary beam control for motorcycle lighting applications.
Arduino and IoT-based LPG gas leak detection systems: a focused review of sensors, architectures, and reliability issues Rinasa Agistya Anugrah; Faiz Bintang Adhidarma; Rico Satrio Hutama; Vitho Kevi Restu Maulana; Yusa Figar Winarno
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3035

Abstract

Liquefied petroleum gas (LPG) leakage remains a major safety concern in households, restaurants, and micro, small, and medium enterprises because leaked combustible gas can accumulate rapidly and trigger fire or explosion. This paper presents a focused review of Arduino- and Internet of Things (IoT)-based LPG gas leak detection systems, emphasizing sensing technologies, embedded architectures, alert mechanisms, performance indicators, and reliability limitations. In response to reviewer concerns, the literature base was expanded from a small set of local prototype papers to more than fifty international peer-reviewed studies from Scopus-indexed journals and proceedings, covering metal oxide semiconductor sensors, MEMS gas sensors, wireless sensor networks, IoT security, low-power communication, signal processing, and TinyML-based gas detection. The synthesis shows that MQ-series sensors remain dominant in low-cost prototypes because of their availability and simple analog interface; however, their practical reliability is constrained by cross-sensitivity, humidity and temperature dependence, heater power consumption, aging, baseline drift, and insufficient calibration. IoT integration improves remote awareness through Wi-Fi, GSM, LoRa, Zigbee, or cloud dashboards. However, it also introduces latency, network outage, service availability, data integrity, and cybersecurity issues. Recent studies indicate that multi-sensor fusion, calibrated testing, edge intelligence, and reliability-oriented design provide a more credible pathway than threshold-based prototypes alone. Future LPG safety systems should therefore combine robust sensing, standardized performance reporting, local fail-safe alarms, secure IoT communication, energy-aware operation, ergonomic installation, and long-term field validation before large-scale household or industrial deployment.
Wire Arc Additive Manufacturing for Lightweight Material Applications: A Systematic Literature Review Agus Widyianto; Heri Wibowo; Riswan Dwi Djatmiko; Atik Setyani
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3332

Abstract

Wire arc additive manufacturing (WAAM) is increasingly used to fabricate large lightweight metal components because it combines wire feedstock, arc-based heat sources, high deposition rate, and high material utilization. This systematic literature review evaluates recent progress in WAAM for aluminum, titanium, and magnesium alloys, with emphasis on process parameters, microstructure, mechanical properties, defects, and industrial applications. The review followed the PRISMA 2020 framework and searched three academic search platforms using six structured queries covering WAAM, lightweight alloys, process parameters, mechanical behavior, microstructure, defects, and applications. From 1,052 records, 305 duplicates were removed, 747 records were screened, 270 papers were assessed in full text, and 265 studies were included in the evidence synthesis. Aluminum alloys were the most frequently reported material system, particularly Al-Mg, Al-Si, Al-Cu, and Al-Zn-Mg-Cu alloys, followed by Ti-6Al-4V and magnesium alloys such as AZ31, AZ91, and WE43. The synthesis shows that heat input, wire feed speed, travel speed, interpass temperature, shielding gas, and deposition strategy strongly control bead geometry, grain morphology, porosity, residual stress, and anisotropy. Cold metal transfer and pulsed arc variants generally improve process stability for aluminum alloys. At the same time, titanium and magnesium systems require stricter oxidation and thermal-cycle control. Optimized WAAM parts can approach wrought-material properties. However, porosity, hot cracking, surface waviness, distortion, and limited in-situ quality assurance remain barriers to wider certification. Future work should prioritize closed-loop monitoring, WAAM-specific alloy design, hybrid post-processing, fatigue qualification, and life-cycle assessment for large-scale lightweight structures. This review provides a concise evidence map to support parameter selection and research planning for WAAM-based lightweight components.
Design of an ESP32-based electronic control system for evaluating motorcycle fuel injector characteristics Banu Amruloh; I Wayan Adiyasa; Moch Solikin; Kurniawan Sigit Wahyudi; Muhammad Nurdin Wahid
Journal of Automotive and Mechanical Applied Technology Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamat.v3i1.3335

Abstract

The development of electronic fuel injection (EFI) technology and the growing use of ethanol-blended fuels have introduced new challenges for motorcycle fuel systems, particularly injector performance and reliability. Commercial injector testers are relatively expensive and often use closed architectures, limiting their accessibility for small workshops and educational laboratories. This study aimed to design and develop a web-based injector characteristic testing control system using an ESP32-S3 CAM microcontroller and to evaluate its performance. An engineering design method with a quantitative testing approach was applied. The system was designed to conduct fuel volume, spray pattern, and leakage tests by controlling engine speed simulation (RPM), duty cycle, and test duration through a web interface. The ESP32-S3 CAM generated pulse-width modulation (PWM) signals to actuate the injector and provided real-time visual monitoring through an integrated camera. The results showed that the system successfully executed the intended testing functions. Increasing RPM, duty cycle, and test duration produced proportional increases in injected fuel volume. Linearity analysis indicated that injector responses were generally linear with respect to changes in RPM and duty cycle. Repeatability testing produced maximum coefficient of variation values of 1% for injector 1 and 2% for injector 2, indicating good measurement consistency. Spray pattern testing showed a uniform cone-shaped atomization pattern. In contrast, leakage testing confirmed the absence of fuel droplets under inactive conditions. These findings demonstrate that the developed ESP32-based tester provides a low-cost, flexible, and practical alternative for evaluating motorcycle injector characteristics in workshop and laboratory settings, especially where standardized diagnostic equipment is not readily available.

Page 3 of 3 | Total Record : 28

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