![]() |
30th Annual Meeting & Conference on Tire Science & Technology Akron/Fairlawn Hilton Hotel: Akron, OH, USA
Tuesday, September 13, 2011: 2:25 PM
Akron/Summit Ballroom (Akron/Fairlawn Hilton Hotel)
The problem of a tire operating on deformable terrain requires extensive computational effort to simulate. Much of the effort goes into simulating the behavior of the soil because the soil response is three dimensional, dynamic, and nonlinear due to material behavior and large deformation. In order to reduce computational times as much as possible it is important to use no more soil volume than necessary. This gives rise to the need to determine an appropriate soil size, a process which itself has the potential to consume significant computational resources. A holistic method to size a dynamic 3-D wheel-soil model has been proposed previously with a demonstration of its effectiveness for a particular case. The method involves the simultaneous adjustment of all soil dimensions to find a large enough size to capture all significant soil deformations while not wasting computational resources on the simulation of unneeded material. The method is efficient because it requires significantly fewer simulation runs than would be required to treat the soil dimensions separately. While the method was effective for the case presented previously, this work has shown the method’s applicability to a broader range of wheel-soil simulation problems. It has been tested with varying wheel aspect ratios, wheel sizes, loads and gravitational fields. The influence of these parameters on the effectiveness of the method has been evaluated and adjustments to the proposed method have been recommended. Also observations have been made regarding changes in the final required soil size with respect to changes in the parameters.
|