The equivalent modeling of hard-coating blisk based on mistuning identification

Abstract

In order to accurately capture the dynamic characteristics of the actual hard-coating blisk and reduce the computation cost, an equivalent finite element modeling method based on mistuning identification was proposed in this study. In this modeling method, virtual single-layer material blades were used to replace the hard-coating blades of multi-layer structure. Meanwhile, based on the mistuning identification theory, the equivalent elastic modulus, as the key parameter, was determined. In addition, the methods to generate the other two equivalent parameters (equivalent density and equivalent Poisson's ratio) were also proposed. Moreover, through the numerical and actual cases, the equivalent models were created by the proposed method respectively and the modal data of the equivalent models was compared and analyzed. Compared with the traditional finite element model (FEM), the structure of the equivalent model is simpler and the number of elements is smaller, however, for the modal data, the comparison results showed good correspondence of the equivalent model and the actual hard-coating blisk.