采用复约束旋转模态子结构法分析离心叶轮振动特性

Dynamic Analysis of Centrifugal Compressor Impellers by Application of Rotating Mode Substructuring

根据叶轮周向循环对称的特点，采用回转周期结构的复约束及旋转模态子结构方法，将计算简化为针对一个叶道进行，从而达到降阶的目的．为了解决采用复约束而出现的广义复Ｈｅｒｍｉｔｅ矩阵特征值问题，提出了一个改进的子空间迭代方法，并对Ｊａｃｏｂｉ迭代作出了相应的修改．最后，用该模型对一个实际离心叶轮振动特性进行了分析。

Dynamic characteristic is performed for three dimensional centrifugal impeller with rotational symmetry. Complex constraining theory and rotating mode substructuring method are used such that it suffices to compute for one sector instead of the entire impeller. An improved subspace method and modified general Jacobi iteration method are also introduced to solve complex Hermitian eigenvalue problem induced by complex constrains. An actual imperller is analyzed and the results are satisfactory.