IDENTIFICATION OF DISCONTINUOUS BLOCK-ORIENTED NONLINEAR DYNAMIC SYSTEMS

The paper deals with the decomposition of block-oriented nonlinear dynamic systems having discontinuous asymmetric nonlinearities and with their identification using the Hammerstein model. Multiple application of a simple decomposition technique provides a special form of Hammerstein model with the minimum number of parameters and the identification can be carried out with only one record of measured input/output data. Putting some parameters of the proposed model to zero we receive models for the nonlinear dynamic systems with pure preload nonlinearities, dead zone or two-segment piecewise-linear asymmetric nonlinearities. To demonstrate the feasibility of the identification method, illustrative examples are included.