Studies on the Vibration of Tractors and Human Response (I)

the Dynamic Behavior of Farm Tractors

Abstract

The tractor vibrations are subject to the influence of very complicated sources-engine, road surface, tilling device etc. We obtained the influence degree of the sources by the spectrum analysis.
(1) The tractor vibrations suffered the largest influence from the engine.
(2) Vertical and transverse vibrations resulted in higher acceleration at the chassis, but vertical and longitudinal vibrations resulted in higher acceleration at the seat.
(3) The ratio of the seat power spectral density (P. S. D) to the chassis P. S. D under 100Hz range resulted as follows,
|A(f)|≈1.0 for vertical diretion
|A(f)|≤0.5 for transverse direction
1.0≤|A(f)≤2.5 for longitudina direction
(4) as for the influence of road surface, only the 1st order of input frequency had a great infiuence on the vibrations of vertical and longitudinal directions, and the influence of the 2nd and 3rd order for transverse direction was large.