一种基于叶盘结构几何失谐的降阶分析方法

叶片几何失谐严重影响叶盘结构的振动特性。为了准确且高效地对存在叶片几何失谐的叶盘结构进行振动分析,基于扇区建模方法,由动力学方程推导出降阶模型的表达式,利用该降阶方法对整个几何失谐叶盘结构分别进行模态分析和受迫响应分析,并与有限元方法进行固有频率和受迫响应结果的对比。结果表明:该降阶方法得到的结果与有限元方法得到的结果基本一致,验证了该方法的有效性和实用性。

A reduced order model of bladed disks with geometric mistuning

The blade geometry mistuning can have a drastic effect on the vibration characteristics of the bladed disk.In order to analyze the vibration characteristics of the bladed disk with geometry mistuning,the expression of reduced order model is derived from the dynamic equation,based on the modeling method with sectors.The modal analysis and force response analysis of bladed disks with geometric mistuning are performed by using the reduced order method,and the result of the natural frequencies and the force response is compared with that by finite element method.The result shows that the data of the two methods agree well,which proves the validity and the utility of the reduced order method.