带分流叶片离心叶轮的动力分析技术

 提出一种可用于实际带分流叶片离心叶轮的动力分析技术,其特点为在叶轮的重复扇形区域中可作多部件分割。先后应用Benfield模态代入变换和群变换,导出减缩坐标下的Hermite广义质量矩阵和刚度矩阵,求解并经变换得出完整叶轮的全部模态。和其它方法对模型和实际叶轮的分析结果以及与试验结果的比较,验证了所提方法的可靠性、实用性及明显的经济效益。

A DYNAMIC ANALYSIS TECHNIQUE OF CENTRIFUGAL IMPELLER WITH SPLIT BLADES

A dynamic analysis technique which can be employed in a real centrifugal impeller with split blades is presented. It shows that multi-component partition can be made in repetitive sector region of the centrifugal impeller.The basic repetitive sector region of the centrifugal impeller is divided into three substructures; the guide blade, the split blade and the sectoral part of the disc. By using Benfield mode substitution transformation combined with group |transformation successfully, the Hermite generalized mass and stiffness matrices under the reduced coordinates are derived. From this, the natural frequencies of the bladed disc coupled system can be solved and the corresponding modal shapes are obtained through transformation.The comparison of the analysis results obtained by using the method presented in this paper and other methods, the experiment data of a testing modal verifies the reliability, practicability and considerable economic benefits of the method presented in this paper.