Vehicle Flexible-Body Dynamic Simulation and Fatigue Prediction

• Main Authors: Hung-Ru Lin, 林宏儒
• Other Authors: 陳嘉勳
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/2bz2jh

碩士 === 國立臺北科技大學 === 車輛工程系所 === 99 === The objective of this research was to use a CAE (Computer-Aided Engineering) model of an off-road vehicle, Dune buggy, to investigate the bearing loads of each critical parts from different road conditions, and analyze the fatigue damage of components. Patran was chosen as the pre-processor tool to deal with the ATV (All Terrain Vehicle) meshing model, and transformed the FEM (Finite Element Method) mode to the flexible body element used in ADAMS. The results of the stress history of components were simulated in ADAMS. The location of the maximum stress point on the model was predicted, and the analysis of fatigue was calculated according to the stress history of maximum stress point. The flexible body dynamic simulation technology could describe the actual elastic deformation of simulated objects. With this technology, the grid computing approach of finite element method could be replaced with a much smaller equation matrix, and simulation time was significantly reduced. Different road conditions, number of modes of the flexible components used, and component properties were simulated and compared in this research. The frame of the model with a 2.5mm thick wall was predicted to have 7.72 hours durable life in a 50km/hr off-road pace. This process could reduce vehicle development cost and the time required for accelerated durability hardware test, and provided preliminary life predictions of parts in early-design stage. It gave an appropriate reference to improve the durability prior the final production.