Title: Model identification for nonlinear automotive seat cushion structure

Authors: Jian Pang, Mohamad Qatu, Rao Dukkipati, Gang Sheng, William N. Patten

Addresses: Ford Motor Company, Dearborn, MI, USA. ' Ford Motor Company, Dearborn, MI, USA. ' Fairfield University, Fairfield, CT, USA. ' Gates Corporation, Rochester Hill, MI, USA. ' Centre for Structural Controls, The University of Oklahoma, Norman, OK, USA

Abstract: This paper presents the nonlinear characteristics of typical automotive seat cushion structures. The experimental transfer functions between the seat butt (upper surface of seat cushion) and the seat track show that the magnitude and frequency decrease as the excitation increases. This indicates that the structure has both nonlinear stiffness and nonlinear damping. This paper develops two nonlinear models for seat cushion structures. The linear and nonlinear terms are compared and analysed in both the models. A Recursive Least Squares (RLS) method is used to identify the nonlinear parameters. The transfer functions obtained by the analytical models compared very well with those obtained experimentally. Two typical seats, a sports car seat and a luxury car seat, are analysed. These two seats represent extreme choices of typical seat structures. The results presented here can be useful for both the analysts and seat cushion designers.

Keywords: seat; vibration; model; nonlinear; human body; vehicle.

DOI: 10.1504/IJVNV.2004.004078

International Journal of Vehicle Noise and Vibration, 2004 Vol.1 No.1/2, pp.142 - 157

Available online: 29 Mar 2004 *

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