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Nonlinear Parametric Identification of Bus Dynamics for Ride Quality and Stability Analysis
Published January 01, 1986 by Yugoslavia Society of Automotive Engineer in Serbia
The search of the ride quality and stability analysis in the design process of commercial road vehicles (e.g. buses) receives a growing attention of research activity, and focuses also on mathematical modelling related to these problems. In this paper we consider 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 behaviour 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/bus/dynamics have to be estimated using new 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 complete vehicle. The paper presents in detail the parametric identification of the above non-linear models based on measurements data carried out on an air suspension bus. 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 will also be investigated. On the basis of the identified nonlinear models we may realize more reliable and efficient procedure for the ride quality and stability analysis of the commerical road vehicles (buses.)