Abstract
This paper considers the nonlinear modelling and identification problem for the ride quality and stability analysis of road vehicles due to excitation of stochastic road surface roughness. The basic nonlinear phenomena in dynamic behavior of ground vehicles are related to the progressive damping and stiffness characteristics of the axle/body dynamics and the nonlinear response of the pneumatics of the wheels excited by the road surface. To model the above system, the parameters in the nonlinear differential equations of vibrating phenomena of road vehicle dynamics have to be estimated by using nonlinear parametric identification methods. In certain experimental situations it is possible to separate the nonlinear analysis of axle subsystem from the dynamic analysis of the linear models based on measurements data carried out on an air suspension vehicle. The determination of the eigenfrequencies appearing in the axle vibrations and of the physical parameters (mass, stiffness and damping one) from the identified model parameters can also be investigated.
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