Study on GFRF modeling method for nonlinear system

Generalized frequency response functions (GFRFs) are a kind of nonparametric model in frequency domain for nonlinear system, which have clear physical signification and application value. Because the direct frequency domain identification of the generalized frequency response functions requires enormous computation, the online engineering applications of the GFRF model are largely restricted. By using multi models composing idea, a new online modeling method for generalized frequency response functions model is presented based on the preset models in this paper, and the model composing formula is deduced. This method can efficiently reduce computer requirement of GFRF online modeling, and can be easily realized in engineering.