The Improvement and Mechanism of Vehicle Rollover Subject to High Speed Side Collision
Date Issued
2008
Date
2008
Author(s)
Tsai, Po-Hsiu
Abstract
Rollover of vehicles is the main cause of severe and fatal injuries during car accidents on the road. In particular, owing to the advent of multi-purpose vehicles, it has become one of the important safety issues in recent years. It is important to realize the mechanisms that induce or aggravate vehicle rollover, and develop effective technology that is able to reduce the propensity of rollover. Using a parametric full-vehicle numerical model and impact force input estimated by the conservation law of energy and momentum from experiments in the literature, the research aims to analyze dynamic behaviors of oblique side collision for passenger vehicles on the highway. Levels of severity for various impact locations are investigated. Based on the results, the maximum roll angle is chosen as the index to represent the severity of vehicle rollover propensity and the most severe location is found to be the rear impact. Mechanisms of rollover under the most severe scenario are revealed by the established model. The strategies of rollover reduction are discussed and improvements are attempted according to the findings of this research. Effects of suspension deformation acceleration, higher damping at high deformation velocity and diagonally interconnected suspension under high speed side collision are compared. The diagonally interconnected suspension turns out to be the most effective system to reduce rollover propensity in which higher damping at low deformation velocity is more effective than that at high deformation velocity.
Subjects
rollover propensity
side impact
suspension damper
interconnected suspension
Type
thesis
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