噪声与振动控制2017，Vol.37Issue(2)：38-41,52,5.DOI:10.3969/j.issn.1006-1355.2017.02.008
基于模态动力学的离心风机振动特性数值研究
Numerical Investigation of the Vibration Character of Centrifugal Fans Based on Modal Dynamics Method
摘要
Abstract
Since the structural responses of the centrifugal fans during the operation are mainly generated by the fluid excitation force and the centrifugal force, it is difficult to accurately simulate and predict the fluid-solid coupled vibration through the traditional analytical method. In this paper, the structural response of a centrifugal fan under the actions of fluid excitation and centrifugal force is studied numerically. Firstly, the three-dimensional transient flow inside the fans is simulated and the fluid excitation force is obtained. Then, the finite element model of the fan is established with the fluid excitation force added to the blades as the input. Finally, the vibration responses of the centrifugal fan are calculated based on the modal dynamics method, and the effect of the parameters such as the blade number of impeller and the thickness of the shroud on the frequency-response curves is studied. The results show that there exist an optimal blade number and an optimal thickness of the shroud for the best effect of vibration reduction. It is found that increasing the thickness of the shroud can increase the strength of the impeller, but will induce stronger vibration for the impeller system at the same time. Therefore, both the impeller structure strength and vibration response should be considered at the same time in the design of the optimal structure of the impeller.关键词
振动与波/模态动力学/离心风机/流体激励力Key words
vibration and wave/modal dynamics/centrifugal fan/fluid excitation分类
机械制造引用本文复制引用
张元禄,南国防..基于模态动力学的离心风机振动特性数值研究[J].噪声与振动控制,2017,37(2):38-41,52,5.基金项目
国家自然科学基金资助项目(51305267) （51305267）
