Integrative design method of blisk considering structure strength and resonant vibration avoidance

The parametric model of blisk was established based on the software of ANSYS.The blisk model with minimum mass and sufficient structure strength,along with stress criterion of the strength design for disk,was accomplished through optimization module of ANSYS.The vibration characteristics of blisk was analyzed,and the influence of the adjustment of disk parameters and blade profile parameters on the nature frequency of blisk were studied.On this basis,the structure design method of blisk considering avoidance of low order excitation was studied through the adjustment of different structural parameters,such as rim thickness,blade lean and blade profile thickness.According to the research statistics,the adjustment of disk parameters can increase the margin between the frequencies of low order coupled vibration and 4E excitation by 2.2% at the maximum rotation speed for the drum-constrained blisk,and the margin increase can be 8% by adjustment of blade profile parameters.The integration design method of blisk considering structure strength and resonant vibration avoidance is feasible,as the margin between the frequencies of 4E excitation and 1st vibration of the final blisk with the minimum mass is up to 10.8% with insulation from 5E excitation at the loss of 4.77% mass increase.