Abstract
The effect of an unbalanced, single axle trailer on tractor ride vibration behaviour is studied using a two dimensional, nine degree of freedom mathematical model. Predicted results for the combination of a tractor, without a suspension, and a trailer indicate that a vertical hitch suspension would improve ride comfort and has parameters which could be achieved in practice. Hitch compliance in the longitudinal direction offers no benefits and free play should be avoided. For a tractor and trailer combination fitted with axle suspensions, the hitch should be attached to the tractor body and should not incorporate any compliance.
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