MODELING OF TRACK-SOIL INTERACTION

摘要

Modeling of interactions requires the idealization of the geometric and physical properties of the interacting media. The modeling of track-soil interaction involves idealizations regarding the vehicle motion, geometry and kinematics of tracks, and the behavior of soil. These idealizations are interrelated. In the case of an accelerating tracked vehicle, the tractive force that provides for the acceleration generates a moment about the C.G. of the vehicle that must be balanced by a redistribution of the interface normal stresses. This interaction must be taken into account if the purpose of the modeling is the simulation of acceleration performance. The modeling of track geometry and soil, main components of the track-soil system, are also interrelated. Soil strength governs the behavior of soil beneath flexible tracks, while soil behavior beneath rigid tracks is generally governed by its volume change properties and only under extreme conditions by its strength. A rigid track-soil interaction model, developed for the determination of maximum soil thrust, is presented and the problems arising from assuming a rigid track geometry are discussed.