Forced vibration analysis of the hard-coating blisk considering the strain-dependent manner of the hard-coating damper

This paper focuses on the passive vibration reduction of the blisk by the hard-coating damper, and investigates the nonlinear dynamics of the hard-coating blisk. Based on the discrete values obtained by the testing, the high-order polynomials are used to characterize the mechanical parameters of the hard-coating damper considering its strain-dependent manner. The boundary conditions and continuity conditions of the disk and the hard-coating blades are satisfied by introducing the artificial springs at their interface. The dynamic model of the hard-coating blisk is constructed by an analytical energy-based approach. An iterative solution procedure based on the Newton-Raphson method is developed to obtain dynamic characteristics of the hard-coating blisk. An academic blisk deposited NiCoCrAlY + YSZ hard coating is selected as the benchmark case to conduct the nonlinear numerical calculation, and the obtained results are compared with those obtained by the experimental test. In particular, the specific influence of the hard-coating damper and the unique strain-dependent manner on the vibration characteristics of the blisk are investigated respectively in terms of the resonant frequencies and corresponding responses.