含谐振子的负泊松比超结构隔振性能研究

Research on Vibration Isolation Performance of Negative Poisson Ratio Metastructure with Harmonic Oscillator

摘要: 空间机械制冷机在轨工作的微振动是影响空间光学遥感器在轨性能的重要因素。本文针对空间制冷机微振动隔离需求，基于二维正弦曲线负泊松比超结构，添加谐振子提高低频隔振性能。首先针对二维正弦曲线负泊松比超材料进行参数分析，确定二维正弦曲线负泊松比胞元的壁厚；然后，通过添加谐振子的方式降低隔振频率，确定谐振子以及弹簧板的尺寸；最后，进行结构的隔振性能分析。结果表明，添加谐振子能够有效提高关注频率处的隔振效率，使得结构在所需的三个频点处的隔振效率优于80%。

Abstract: The micro-vibration of space mechanical cooler in orbit is an important factor affecting the performance of space optical remote sensor in orbit. In this paper, based on the two-dimensional sinusoidal negative Poisson ratio metastructure, harmonic oscillator is added to improve the low frequency vibration isolation performance of space mechanical cooler. Firstly, the parameters of metamaterial with negative sinusoidal Poisson ratio were analyzed, and the thickness of cell with negative sinusoidal Poisson ratio was determined. Then, the vibration isolation frequency is reduced by adding harmonic oscillator, the dimensions of harmonic oscillator and spring plate are determined. Finally, the vibration isolation performance of the structure is analyzed. The results show that adding harmonic oscillator can effectively improve the vibration isolation efficiency at the frequency of concern, and the vibration isolation efficiency of the structure at the required three frequency points is better than 80%.