低频振动控制用阻尼器流固耦合仿真  

FLUID STRUCTURE COUPLING SIMULATION OF DAMPER FOR LOW FREQUENCY VIBRATION CONTROL OF SATELLITE FLEXIBLE APPENDAGES

作　　者：李振哲 华璟 孙杰[1] 周徐斌[2] 刘兴天[1] Li Zhenzhe;Hua Jing;Sun Jie;Zhou Xubin;Liu Xingtian(Shanghai Institute of Satellite Engineering,Shanghai 201109,China;Shanghai Aerospace of Spaceflight Technology,Shanghai 201109,China)

机构地区：[1]上海卫星工程研究所,上海201109 [2]上海航天技术研究院,上海201109

出　　处：《动力学与控制学报》2022年第4期91-96,共6页Journal of Dynamics and Control

基　　金：国家自然科学基金资助项目(51875363)。

摘　　要：卫星挠性附件的低频振动极易与整星发生动力学耦合,进而影响姿态控制效果与卫星成像性能.本文设计了一种新型流体阻尼器,通过在挠性附件和星体之间串联该流体阻尼器的方案来快速稳定挠性附件的低频振动;建立了阻尼器结构模型,使用基于有限元法的流固耦合仿真获取了阻尼器在低频激励下的迟滞回线;研究了流体阻尼器的阻尼特性;定义了阻尼系数并给出了阻尼系数随阻尼孔径、阻尼孔长和激励频率的变化规律.结果表明,低频激励下阻尼系数随激励频率的增加而减小,随孔径与孔长的增加而先增大后减小,存在最佳阻尼系数.该结果为阻尼器在工程实际中的应用提供设计参考.The low frequency vibration of flexible appendage of the satellite is easy to be coupled with the whole satellite,and affect the attitude control effect and imaging performance of the satellite.In this paper,a new type of fluid damper is designed,which can quickly stabilize the low frequency vibration of the flexible appendage by connecting the fluid damper in series between the flexible appendage and the satellite.The specific structural model of the damper are established,and the damping characteristics of the fluid damper are studied by using the finite element analysis method.The variation of damping coefficient with orifice diameter,orifice length and excitation frequency is obtained.The result shows that under low frequency excitation,the damping coefficient decreases with the increase of excitation frequency.The damping coefficient increases first and then decreases with the increase of the diameter and length of the damping hole.The result in this paper can provide useful design reference for the application of this kind of damper in engineering practice.

关 键 词：流体阻尼器 流固耦合 低频振动 滞回曲线 最佳阻尼系数 

分 类 号：O328[理学—一般力学与力学基础]