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Abstract
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.
Published Version
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