Abstract
Dynamic behaviors of crawler-type vehicles in off-road running are nonlinear phenomena caused by the changeable boundary conditions of the ground, and the rattle of the crawler. Therefore, they are usually analyzed by direct numerical calculation of equations of motion using a rigid body and mass-spring-type model. But in this method, the effect of flexibility is not considered for the frame component of which a vehicle consists. In this paper, an efficient method is proposed, by which most hard behavior can be analyzed on falling impact with the ground when a crawler-type vehicle is running over a bump. This method consists of 2-D rigid-body motion analysis, component mode synthesis, and modal response analysis, and hence it can be applied to a large size model which contains flexible structures. Usefulness of this method in application to a bulldozer is demonstrated by simulation and experiment.
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