自适应摄动法在失谐叶盘受迫振动分析中的应用

Automatic Mode-Selecting Method for Analysis to Forced Response of Mistuned Bladed Disks

针对自适应摄动法在失谐叶盘受迫振动分析中,选择接近激振力频率的相应模态数目难于控制的问题,基于质量-弹簧模型,提出一种自动选择模态的方法。该方法可根据激振力频率与基系统固有频率集的关系,自动选择最接近激振力频率的相应模态个数。计算结果显示,对失谐叶盘系统,特别是在弱耦合情况下,该方法比人为选择模态更为可靠,可以使用较少机时,获得较高的求解精度。

Based on mass-spring model,a method of automatic mode-selecting method is presented to solve the difficulties of selecting corresponding modes close to the excitation frequency,in adaptive perturbation for mistuned bladed disks.Acording to the relationship between the natural frequency and the excitation frequency,those corresponding modes mostly close to the excitation frequency can be selected automatically.The results show that the method is more reliable than selecting modes manually,especially for weak coupling mistuned bladed disks with a higher accuracy as well as less computation period.