Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2018
Date : August 28, 2018 - August 31, 2018
For analysis of dynamic characteristics of bladed disk systems, such as jet engines and turbines, the assumption that all the blades are identical and the system is cyclic symmetric is often used (tuned system). However, in a real system, there are small differences in the individual blades’ structural properties that result from manufacturing tolerance. The system becomes nearly periodic structure (mistuned system). In this paper, we propose an approximation method to analyze the random vibration characteristics of the blade system by combining sensitivity analysis and stochastic method. The proposed method makes it possible to investigate the influence of standard deviation of the mistune value on the statistic of frequency responses. We compared the analysis results with Monte Carlo simulation and examined approximation accuracy. By using the proposed method, we also analyze the case where the configuration of mistuned blades is changed and discuss the configurations of mistuned blades with the smallest three-sigma limit.
