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All Journal Mechanical Engineering for Society and Industry Automotive Experiences
Agus Sigit Pramono
Institut Teknologi Sepuluh Nopember, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Investigation of discrepancies in isotropic material and structural properties in lattice frameworks Ahmad Anas Arifin; I Made Londen Batan; Michele Bici; Arif Wahjudi; Agus Sigit Pramono
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13018

Abstract

Lattice structures have developed as a vital component in advanced engineering applications due to their superior strength-to-weight ratios and adjustable mechanical properties. This paper focuses on examining the correlation between the isotropic features of lattices at the material level and their structural performance. The research used near-isotropic Crossing-cylinder (CC)- Body Centered Cubic (BCC) cells in various orientations and sizes. Both experimental analysis and finite element analysis were used to examine the compressive strength of the structure in each orientation. The results reveal that cell orientation is important for determining failure modes and mechanical performance at the structural level. At 0°, the lattice has higher compressive strength and energy absorption due to effective load transfer via CC-aligned struts. In contrast, higher orientations (e.g., 15°, 30°, and 45°) are dominated by collapse-type failures, indicating anisotropic behavior in an otherwise isotropic design. Smaller cell sizes have more strength at lower orientations due to their higher relative density, but larger cells perform better at higher orientations.
Effect of Anti-lock Braking System Modulation Frequency on Flywheel-Based Energy Harvesting During Panic Braking Agung Prijo Budijono; I Nyoman Sutantra; Agus Sigit Pramono; Aris Purwanto; Po-Hung Lin
Automotive Experiences Vol. 9 No. 1 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.16210

Abstract

A considerable portion of braking energy in electric vehicles is dissipated as heat, especially during severe or panic braking. This study experimentally investigates the effect of anti-lock braking system (ABS) modulation frequency on flywheel-based energy harvesting during panic braking using a laboratory-scale Flywheel Regenerative Capture System (FRCS). The proposed setup integrates an ABS braking unit, a magnetic clutch, a flywheel, and an electrical generator to recover part of the braking energy while maintaining braking stability. Experiments were conducted at ABS modulation frequencies of 10, 20, 30, 40, and 50 Hz. Braking performance was evaluated using wheel-speed response, slip ratio, braking time, braking distance, flywheel rotational response, and generated electrical power. At an initial braking speed of 1000 rpm, the ABS braking process operated within a slip-ratio range of approximately 0.17–0.38, while the shortest braking distance under regenerative braking reached about 15.83 m at 40 Hz, compared with about 19.58 m at 10 Hz without regenerative braking. The 10 Hz setting produced the most stable deceleration pattern, the highest flywheel rotational response, and the highest electrical output, whereas higher frequencies increased fluctuation and reduced effective torque transfer to the generator. These findings indicate that ABS modulation frequency strongly influences both braking stability and flywheel-based energy harvesting performance. The study demonstrates the feasibility of integrating a flywheel regenerative capture system with ABS-controlled panic braking, providing a basis for further vehicle-scale development.
Development of an Automatic Coupler for Railway Vehicles: A Topology Optimization Approach with Numerical and Experimental Validation Jean Mario Valentino; Agus Sigit Pramono; Achmad Syaifudin; Lukman Shalahuddin; Mustasyar Perkasa; Katsuhiko Sasaki
Automotive Experiences Vol. 7 No. 3 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11494

Abstract

Topology optimization has demonstrated its effectiveness in generating lightweight and structurally efficient designs. This study focuses on refining the geometry of an automatic coupler body for trains using solid isotropic material with penalization and a level set method. These optimization methods are applied to the numerical model of the automatic coupler, and their results are compared to select the optimal design. The tensile strength of the automatic coupler is examined through numerical simulations and validated by experimental tensile tests conducted on a 1:1 scale prototype. The optimization outcomes reveal a remarkable 46.41% reduction in the mass of the automatic coupler body compared to the initial model. An evaluation of the tensile strength of the prototype demonstrates the ability of the automatic coupler to withstand the primary load without undergoing plastic deformation. Furthermore, a strong correlation is observed between the numerical and experimental results. This research contributes to advancing the design of next-generation automatic couplers, emphasizing the crucial aspects of lightweight design and structural performance.
Co-Authors Achmad Syaifudin Agung Prijo Budijono Ahmad Anas Arifin Arif Wahjudi Aris Purwanto I Made Londen Batan I Nyoman Sutantra Jean Mario Valentino Katsuhiko Sasaki Lukman Shalahuddin Michele Bici Mustasyar Perkasa Po-Hung Lin