In Situ Measurement of Discomfort Curves for Seated Subjects in a Car on the Four-Post Rig

Table 2

Dominant resonance frequencies and associated amplification factors at seat capturing vehicle-seat-occupant dynamic behaviour.

Resonance frequency	Mode	Input-output	Amplification factor
1.75 Hz	Vehicle bounce	Road to seat	1.55
9 Hz	Seat bounce	Floor to seat	2.7
11 Hz	Seat + backrest motion	Floor to seat	3.25
12 Hz	Seat pitch	Floor to seat	1.7 m/rad
13 Hz	Seat Roll	Floor to seat	1.15 m/rad
13 Hz	Wheel hub	Road to seat	0.5