A method of predicting seat transmissibility from mathematical models of the seat and the human body is described. The complex dynamic stiffness of a seat is determined by measurement using an indenter rig, and its stiffness and damping subsequently determined by curve-fitting. By using the fitted stiffness and damping of the seat model, and a previously determined dynamic model of the human body, the seat transmissibility is predicted mathematically. The method is illustrated with data obtained with a car seat and also a rectangular sample of foam. The seat and foam transmissibilities were predicted over the frequency range 1.25-25 Hz using two alternative models of the human body (a one-degree-of-freedom model and a two-degree-of-freedom model). The predicted seat transmissibilities were close to those measured in a group of eight subjects over the entire frequency range. The two-degree-of-freedom model of the human body provided better predictions where the seat and foam showed a second resonance around 8 Hz. The need for a non-linear mathematical model of the human body and a non-linear seat model is discussed.
The prediction of seat transmissibility from measures of seat impedance
Prädiktion der Schwingungsübertragungseigenschaften aus der Messung der akustischen Impedanz eines Fahrzeugsitzes
Journal of Sound and Vibration ; 214 , 1 ; 121-137
1998
17 Seiten, 16 Bilder, 1 Tabelle, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
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