Papers by Keyword: Deliberate Mistuned

Abstract: In this paper, based on the test data of blade static frequency and simulating blade deliberate mistuned by changing elastic modulus, a method combining dichotomy and finite element is presented which can identify elastic modulus parameters of mistuned blades. Then, when value of the frequency difference is 5Hz and 41Hz, dynamic characteristics of deliberate mistuned bladed-disk system are investigated separately under operating speed, on the basis of substructure method. Apply the exciting force of airflow on the fronts of blades tip. According to dynamic test results, it takes 4 as the excitation order. The analysis results show that with the mistuned frequency difference increasing, the largest amplitude of blade will decrease gradually. The deliberate mistuned scheme of large frequency difference as scheme Ⅱ is more effective than the small one as schemeⅠto reduce the vibration of bladed disk system under working speed of 11300r/min. The analysis results are consistent with the dynamic test ones.

Abstract: In this paper first,a method combining dichotomy and finite element is presented which identify elastic modulus parameters of mistuned bladed based on the test data of blade static frequency and simulation blade deliberate mistuned by change elastic modulus.Then, dynamic characteristics of deliberate mistuned 10Hz and 41Hz bladed-disk system were analyzed in work rotating speed based on CMS mothod, respectively. The exciting force of airflow exert on costal margin of blade tip.According to dynamic test results,the incentive order is 4. The analysis results show that along with the mistuning frequency difference increases,the largest amplitude of blade is becoming smaller(except tuned system) , and scheme of large frequency difference 41Hz deliberate mistuned (scheme Ⅱ) better than scheme of small frequency difference 10Hz deliberate mistuned (scheme Ⅰ) for vibration reduction of bladed-disk system in work rotating speed for 11300r/min. The analysis results are consistent with the dynamic test results.