Off-Road Soft Soil Tire Model Development and Experimental Testing
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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The goal of this paper is to present an accurate, comprehensive, and efficient, off-road tire model for soft soil applications traction, handling, ride, and vehicle durability as needed to support current Army simulation needs. The literature review revealed that, while FEM lead to the most detailed tire-soil models, their complexity and extensive computational effort make them less than ideal for the applications envisioned. The proposed approach is a detailed semi-analytical tire model for soft soil that utilizes tire construction details which parallel commercially available on-road tire models. The novelty relies on increasing the level of details for the tire model, in improving the tire-soil interface model by enhancing the resolution of the tire model at the contact patch, and by accounting for effects and phenomena not considered in existing models. The model will be validated against experimental data. For low speed, testing will be done on a single tire on sandy loam in the terramechanics rig at Virginia Tech. The influence of tire and vehicle parameters on the contact patch forces and on the forces transmitted to the axle will be investigated. The effect of soil characteristics on the tire dynamics will be studied. Validation against data collected from full vehicle testing is included in the proposed future work.
- Soil Mechanics
- Surface Transportation and Equipment