基于激励阶次的失谐叶盘振动响应局部化研究

Study of Localization for the Forced Vibration of Mistuned Bladed Disks Based on Engine Orders of Excitation

为了评估不同激励阶次和不同失谐标准差对叶盘系统结构振动的局部化影响,针对航空发动机压气机叶盘系统有限元模型,考虑榫槽和榫头的非线性接触,采用子结构模态综合法,通过引入相对振动局部化因子,研究了在不同激励阶次下的谐调和失谐两种情况下叶盘系统振动响应,分析不同失谐标准差下失谐叶盘系统的振动响应局部化特性,讨论了激励阶次对失谐叶盘系统位移和应变能的影响规律.结果表明,激励阶次对失谐叶盘系统频率、位移和应变能分布影响显著,随着激励阶次的增加,相对局部化因子呈现先增大再减小的趋势.

In order to evaluate the effect of localization for various engine orders of excitation and levels of mistuning on mistuned bladed disks, the finite element model of aero-engine compressor＇ s bladed disks was established. Considering the non-linear contact problem of tenon and mortise, the localization of various engine orders of excitation of mistuned bladed disks was studied by adopting the component mode synthesis method and introducing the relative localization factors. The effect of displacement and strain energy for various engine orders of excitation of mistuned bladed disks was discussed, whose results indicated that the engine orders of excitation have significant effect on frequency, displacement and strain energy. With the increase of engine orders of excitation, the relative localization factors tend to first increase and then drop.