タイヤと軟弱地盤系のモデリングと動解析(<小特集>TRANSLOG2009/J-RAIL2009)

概要

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The purpose of this study is to develop and propose an efficient interaction model and an analytical method of a tire and the soft ground which can be applied to the multibody dynamics for off-road vehicles. The model presented in this paper describes the deformable behavior of the elastic tire and the behavior with large displacement of the soft ground. We adopt a distributed lumped mass-spring model as the tire, Discrete Element (DE) model as the upper soft ground and a mass-spring model with Bekker's theory as the lower soft ground. A tire model with the lug considering contact geometry with the soft ground is also developed on the basis of the original tire model. Numerical simulations of the tire behavior on the soft ground under several conditions using the proposed model have been conducted. The numerical results showed that the proposed model and analytical method would be validated for the vehicle dynamics simulation compared with the results of a lot of previous experiments from some references. They also indicated that the tire with low stiffness and with the small angle lug could be effective in improving the tractive performance of the tire on the soft ground.
2010-10-25