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| Performances of a reaction wheel vibration isolator with a spring made ofmanganese-copper high damping alloy |
| WANG Yixin， XU Yang， SHENG Xiaowei， YIN Xianbo |
| School of Mechanical Engineering，Donghua University, Shanghai 201620,China |
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Abstract In order to solve the problem of satellite imaging quality degradation caused by micro-vibration of reaction wheel, a six-dof passive vibration isolation system was designed according to the micro-vibration characteristics of reaction wheel. The vibration isolation system reduces the overall modal frequency of the system through spring stiffness design, and the high damping manganese-copper alloy is used as vibration isolation element material to improve vibration energy attenuation. Firstly, the dynamic model of vibration isolation system was established by Lagrange equation. Considering the influence of stiffness on vibration isolation performance, different structural parameters of spring were designed for comparison. The relationship between the stiffness ratio of diameter-axis and the fundamental frequency of the system was analyzed, and the optimal structural parameters of vibration isolation were determined. Secondly, the finite element method is used to analyze the modal and vibration transfer characteristics of the vibration isolation system, and the vibration suppression performance under various degrees of freedom is discussed. Finally, a Kistler micro-vibration test platform was built to measure the micro-vibration of the reaction wheel before and after vibration isolation, and the vibration reduction effect of the isolator was analyzed and verified. The results show that the vibration isolation effect of the vibration isolation system is significant in six disturbance directions and in the range of middle and high frequency, and the vibration isolation effect is more than 40dB at 1000Hz main frequency vibration. The vibration reduction percentage of the maximum vibration amplitude in the Fz direction from 0 to 2500rpm is 92.42%.
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Received: 28 June 2022
Published: 28 July 2023
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