非循环对称力作用下离心叶轮的谐响应分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 142-147.

论文

非循环对称力作用下离心叶轮的谐响应分析

肖军1,2，赵远扬1,2，舒悦1,2

作者信息 +

Harmonic Analysis of a Centrifugal Impeller with non-cyclic exciting forces

XIAO Jun1,2 ZHAO Yuanyang1,2 SHU Yue1,2

Author information +

文章历史 +

摘要

为研究流场中离心叶轮受气流激振的受迫振动问题，利用叶盘结构的循环对称性编制计算程序，实现了使用循环对称模型进行非循环对称力作用下离心叶轮的谐响应分析。针对空间周期性的来流条件，由各扇区所受周期激励的相位差建立载荷向量，然后根据按扇区展开的叶轮各节径模态的振型数据，建立模态坐标系下的谐响应运动方程，计算得到叶轮的谐响应位移。以一半开式径向叶轮为例，进行了叶盘结构在气动力非循环对称分布情况下的谐响应分析。循环对称模型与整体模型计算的位移响应结果符合较好，两个共振点附近激振频率下的振动响应均呈现出较高的幅值，表明了算法的正确性和预测气流激励导致共振的有效性。

Abstract

In order to investigate the forced vibration problems of centrifugal impellers subjected to gas excitation in the flow fields, an algorithm to calculate the harmonic responses of impellers under non-cyclic exciting forces is realized using the cyclic model. The cyclic symmetry of structure is considered in the programming. For the spatially periodic inflow conditions, firstly the load vector is constructed according to the phase differences of periodic excitations among the sectors, and then by utilizing the modal shape data of different nodal diameters the harmonic response dynamic equations are established under the modal coordinate system to calculate the displacement response. Finally, the harmonic analyses of a radial impeller under non-cyclic aerodynamic exciting forces are carried out. The displacement response results obtained from the cyclic model agree well with those from the integral model. The responses under the exciting frequencies near two resonance points both show relatively higher amplitudes. All the results manifest the correctness of algorithm and its effectiveness to predict the resonance caused by gas excitation.

导出引用

肖军1,2，赵远扬1,2，舒悦1,2. 非循环对称力作用下离心叶轮的谐响应分析[J]. 振动与冲击, 2016, 35(23): 142-147

XIAO Jun1,2 ZHAO Yuanyang1,2 SHU Yue1,2. Harmonic Analysis of a Centrifugal Impeller with non-cyclic exciting forces[J]. Journal of Vibration and Shock, 2016, 35(23): 142-147

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