Mistuning identification and model updating of coating blisk based on modal test

Abstract

Abstract Compared with a single material structure, the coating blisk contains at least two kinds of materials, thus the mistuning modeling and identification are more challenging than the usual bladed disk structure. In this study, on the basis of the component mode mistuning (CMM) and modal test, a method of mistuning identification was proposed for the coating blisk. The CMM model of the coating blisk was described firstly. Considering the mass and stiffness mistuning of the blisk substrate and coating materials simultaneously, the mistuning identification formula of the coating blisk was derived. Then, a novel method for the mistuning identification of coating blisk by measuring only two point modal coordinates of the blades was proposed. For the simplified numerical model and the relevant actual structure of coating blisk, the mistuning identifications were performed respectively, it was shown that the identification results are basically consistent with the predefined mistuning, which proved the rationality of the proposed mistuning identification method. Finally, based on the identification result of actual coating blisk, the original finite element model (FEM) of coating blisk was updated, and the simulation precision of FEM was improved.