See the study HERE. …. should the seat be exposed to high vibration magnitudes, it might not perform very well, resulting in a poor “ride” for the occupant. An example of this type of case is a luxury car which is driven on relatively smooth surfaces (asphalt roads) and has a high specification suspension.
Ψ = ss + fst + dva + itvta
where Discomfort Ψ  = Static Discomfort Constant + Fatigue Constant + Vibration Discomfort Index + (Interaction Constant x Time x Frequency Weighted r.s.s. Acceleration)