Model prediction of vibration effects on human subject seated on various cushions

Vertical and horizontal vibrations of a 100 kg seated human body on cushions of various mechanical parameters have been investigated. The vibration inputs were from (a) steering, (b) cushion and (c) a combination of the two. A previously developed model has been used in this study. Resonance frequencies and gains of body segments have been found. The results obtained have been tabulated and presented in graphical manner. It is found that each body segment response depends on the source (steering, cushion or a combination of the two) and the kind (vertical or horizontal) of vibrations as well as the mechanical parameters (mass, stiffness, and damping) of the cushion.