Vibration Mitigation of Bladed Disk by Vibration Absorber Array and Experiment Validation

Blisk is a crucial component of high-performance aircraft engines. The increasingly pronounced vibration issues of blisks have become a significant bottleneck in developing high-performance aircraft engines. This paper addresses a newly developed method, the circular vibration absorber array (CVAA), for the vibration mitigation of blisk. Numerical and experimental results are presented to gain comprehensive insights into the vibration mitigation characteristics of CVAA. In addition, a test rig is set up for validating the performance of CVAA, which employs piezoelectric ceramic plates as an excitation source for the blisk. By setting difference in the phases of the exciting signals to the piezoelectric ceramic plates, the engine order excitation can be easily simulated. In order to efficiently obtain the vibration mitigation characteristics of the CVAA, a reduced-order model is developed for the coupled blisk-CVAA system, where piezoelectric ceramic components are also involved. This model facilitates flexible parameter adjustment, resulting in significant improvements in the CVAA's design efficiency. On this basis, the effects of the mass, damping level, frequency tuning accuracy of CVAA on the vibration of tuned and mistuned blisk are investigated. Numerical and experimental results demonstrate that the vibration attenuation performance is satisfactory, and quite well robustness against random mistuning in blisk is also observed.