Blade detuning test,mistuning identification and model verification of blisk
The blade mistuning identification and model validation for an academic blisk test piece based on the blade detuning tests were performed.Blade detuning tests were carried out to obtain the'blade-alone'modal frequencies of each individual blade of the blisk.A guideline was proposed for determining the position of the detuning mass onto the blade.Secondly,a novel mistuning identification method was introduced to account for the residual inter-blade coupling effect due to detuning masses and yield more accurate blade mistuning identification results.The impacts of different detuning mass and positions on the blade detuning test and mistuning identification results were investigated.A mistuned blisk finite element model could be further established;the mistuned blisk model was experimentally verified by the conventional modal test.Excellent agreement was achieved between the numerically/experimentally derived natural frequencies and mode shapes of the blisk.The majority of the frequency deviations fell below 0.3％.Results showed that the novel mistuning identification method improved the accuracy of the blade mistuning patterns directly obtained from the blade detuning test results.The resultant mistuned blisk model can effectively reproduce the natural vibration characteristics of the real blisk test piece.
NETL
NSTL
万方数据
