Nowadays still it is a problem to introduce transfer matrix of the nozzle with variable geometry to the classical Helmholtz model to analyze it influence on the whole system. In the past several identification methods were presented but some of them are too complicated for practical applications. Such a method must be reliable, easy and can't be time-consuming. Two methods described in the literature meet all these conditions: the CFD-based identification method and analytical extension to the transfer matrix method. This methods can be useful also to recognize the resonant frequencies for variable cross-section geometries. From the other hand, nowadays the commercial software can be used to calculate various acoustic parameters for the variable cross-section elements. In this paper the identification of the generalized transfer matrix comparison for the nozzle-type geometry is presented for the analytical and CFD-based method. Additionally the first resonant frequency obtained using three different methods are compared.
