失谐叶盘结构的概率响应局部化特性

基于某典型叶盘结构的减缩有限元模型和Monte Carlo-响应面法数值计算,详细分析了几何参数失谐叶盘结构的概率响应局部化特性.给出了几何失谐叶盘结构的有限元建模及减缩方法,并通过定义响应放大因子对受迫响应的局部化程度进行定量描述,分别计算了不同形式的随机失谐和主动错频叶盘结构的概率局部化特性,讨论了失谐形式和失谐参数的影响规律等.研究表明,随着失谐程度的增加,失谐系统的响应水平及其分散程度都会有一个峰值存在.

Probability characteristics for response localization of mistuned bladed disk assemblies

Based on the reduced-order finite element(FE) model and its Monte Carlo-response surface method,the localization characteristics of a typical bladed disk with geometry mistuning were researched in detail,with particular regard to the subjects of the probability characteristics for the forced response.An FE modeling method of bladed disks with geometry mistuning was given,and the order-reduction method was presented as well.Then the response properties of the tuned structure were discussed.The response magnification factor was defined to assess quantitatively the behavior of the vibratory localization.The statistical characteristics of the forced response of the stochastically mistuned and detuned structures were simulated and their main properties were explained.Results indicate that there is a peak phenomenon in the mean values and standard deviations of the response with the increasing mistuning strength.