SIMULATED ANALYSIS OF TIRE FORCE OF A WHEELED TRACTOR ON TYPICAL ROAD CONDITIONS

摘要

In order to study the tire force of a wheeled tractor on typical road conditions, a simulation model of a wheeled tractor was built using the multi-body dynamics software RecurDyn. The model consisted of four wheels, front and rear axes, and a body frame. An interaction model between tires and soft soil was established using the Fiala tire module of RecurDyn. The simulations of displacement and force of the tires were conducted on 20° up-slope, 44° ultimate up-slope, 20° down-slope and 34° ultimate down-slope roads respectively. The tire force that the wheeled tractor ran over a cylindrical obstacle was analyzed at two different speeds. Results showed that forces of the front wheel were different on different slope roads. The maximum impact force of the front wheel increased by 67.73% as the up-slope increasing from 20° to 44°. The maximum impact force of the front wheel decreased by 8% when the down-slope changing from 20° to 34°. The maximum force of the front wheel decreased by 16.13% when the wheeled tractor over a cylindrical obstacle with the speeds decreasing from 1.356m/s to 0.678m/s. The analysis result is helpful for the study on the tire force of a wheeled tractor.