2009 Volume 71 Issue 1 Pages 1_124-1_130
Six modes of vibration on a farm tractor caused by tire lugs were investigated by running the tractor on a flat surface concrete road. Vibrations pertaining to pitch and bounce modes were caused by each lug on the rear tires exerting contact forces on the road surface, whereas both yaw and left-and-right translational vibration modes were brought about by forced vibrations of a pair of lugs on the rear tires. Vibration relating to roll mode was caused by each lug, as well as by each pair of lugs. This phenomenon showed that while the up-and-down forced vibration was mainly due to surface contact forces exerted by each rear tire lug, the left-and-right forced vibration was similarly produced by corresponding forces exerted by a pair of rear tire lugs. Pitch and up-and-down translational vibration modes were also caused by each lug on the front tires, although no observable results can be obtained on the effects of a pair of front tire lugs on specific vibration modes.
