一种航天用磁性液体吸振器的减振性能研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (21) : 298-305.

论文

一种航天用磁性液体吸振器的减振性能研究

姚杰1，李辉1，李德才1,2，赵心语1，李振坤1

作者信息 +

Damping performance of a magnetic liquid vibration absorber for spacecrafts

YAO Jie1, LI Hui1, LI Decai1,2, ZHAO Xinyu1, LI Zhenkun1

Author information +

文章历史 +

摘要

为抑制航天器大型柔性结构的低频振动，研究了一种基于磁性液体悬浮原理的新型吸振器。建立了该吸振器的动力学模型，推导了磁性液体悬浮力和粘性阻尼力方程。针对方程中磁性液体的界面求解问题，根据磁性液体的伯努利方程和界面方程，分析了磁性液体界面与磁场强度的关系，建立了磁性液体界面、悬浮力和粘性阻尼力的仿真方法。通过仿真和实验研究了壳体高度对磁性液体悬浮力和粘性阻尼力的影响规律，分析了仿真与实验的差异。基于铜板的自由振动实验，验证了该吸振器抑制低频自由振动的有效性。结果表明，该吸振器具有较好的线性特征，对1.1Hz、5mm的自由振动时间最高可缩减85%。

Abstract

A vibration absorber based on the magnetic fluid's levitation principle was studied to suppress the low frequency vibration of sizeable, flexible spacecraft structures. The dynamic model of the absorber was established, and the equations of magnetic fluid's buoyant forces and viscous damping forces were derived. According to the magnetic fluid's Bernoulli equation and interface equation, the relationship between the magnetic fluid interface and magnetic field strength was analyzed. Simulation methods were established to calculate magnetic fluid interfaces, buoyant forces, and viscous damping forces. The results show that buoyant and viscous damping forces have good linear characteristics. The influence of shell heights on the magnetic fluid's levitation and viscous damping forces was studied by simulations and experiments, and the difference between simulations and experiments was analyzed. Based on the copper plate's free vibration experiment, the vibration absorber's effectiveness in suppressing low frequency free vibration was verified. Using the vibration absorber, the free vibration of 1.1Hz and 5mm can reduce the vibration time by 85%.

导出引用

姚杰1，李辉1，李德才1,2，赵心语1，李振坤1. 一种航天用磁性液体吸振器的减振性能研究[J]. 振动与冲击, 2023, 42(21): 298-305

YAO Jie1, LI Hui1, LI Decai1,2, ZHAO Xinyu1, LI Zhenkun1. Damping performance of a magnetic liquid vibration absorber for spacecrafts[J]. Journal of Vibration and Shock, 2023, 42(21): 298-305

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