An Equal Sensation Study of Differential Vibration Between Feet and Seat

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Abstract
The equal sensation matching technique has been applied, to a situation in which subjects were seated in a car seat without any restraints, and random foot vibration was used as a datum to yield a subjectively judged equal-sensation contour for sinusoidal body vibration. The same random foot vibration was then compared with random body vibration to find a new datum. The equal sensation random body vibration was used as a datum to yield equal-sensation contours for sinusoidal foot vibration. The loop was concluded by comparing the previously obtained sinusoidal vibration of the feet to that of the body on equal-sensation basis. This procedure gave two sets of results for equal sensation body vibration. Since the second was derived via three equal sensation experiments and agreed well with the first this experiment gives good substantiation of the equal sensation technique. The information on equal sensation for foot and body vibration could find application in the field of vehicle ride research.

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