Fatigue Analysis of Motorcycle Rear Swing Arm on Different Road Surfaces

<div class="section abstract"><div class="htmlview paragraph">The rear swing arm, a crucial motorcycle component, connects the frame and wheel, absorbing the vehicle’s load and various road impacts. Over time, these forces can damage the swing arm, highlighting the need for robust design to ensure safety. Identifying potential vulnerabilities through simulation reduces the risk of failure during the design phase. This study performs a detailed fatigue analysis of the swing arm across different road conditions.</div><div class="htmlview paragraph">Data for this research were collected from real-vehicle experiments and simulation analyses, ensuring accuracy by comparing against actual performance. Following CNS 15819-5 standards, road surfaces such as poorly maintained, bumpy, and uneven roads were tested. Using Motion View, a comprehensive multi-body dynamic model was created for thorough fatigue analysis.</div><div class="htmlview paragraph">The results identified the most stress-prone areas on the swing arm, with maximum stress recorded at 109.6N on poorly maintained roads, 218.3N on bumpy surfaces, and 104.8N on uneven roads. These stress points consistently appeared near the connection of the rear shock absorber. This analysis not only minimizes the need for extensive real-vehicle testing but also swiftly identifies structural weaknesses, reducing both time and costs. It provides valuable insights for design optimization, serving as a key reference for future product development in the industry.</div></div>