永磁体型高静低动刚度隔振器试验研究

Experimental Study on the Permanent Magnets Vibration Isolators with High-static and Low-dynamic Stiffness

高静低动刚度隔振器是一种将正负刚度弹性元件并联在静平衡位置附近获得零刚度的组合式被动隔振装 置,能有效解决低固有频率和小静态变形难以兼得的矛盾。研制并装配双环永磁体型和三磁体型两种高静低动刚度 隔振器原理样机,搭建试验台架系统,开展谐波位移激励下的双环永磁体型隔振器和谐波力激励下的三磁体型隔振器 的性能测试,并与相应等效线性隔振系统的传递特性进行对比,从而对永磁体型高静低动刚度隔振系统低频隔振的优 越性进行验证。试验结果表明,引入磁负刚度能降低系统的固有频率,拓宽系统的隔振频带,降低系统的传递率峰值。

The vibration isolator with high-static and low-dynamic stiffness(HSLDS)is a combined passive vibration isolation mechanism by parallel connecting the negative stiffness mechanism and positive stiffness mechanism,which can effectively solve the contradiction between low natural frequency and small static deformation.In this paper,two kinds of HSLDS vibration isolator prototypes based on permanent magnets type were developed and assembled,namely the biannular shaped permanent magnets mechanism and the tri-magnets mechanism respectively.The experimental bench systems were built and the vibration isolation performance tests were conducted.The performance tests of the bi-annularshaped permanent magnets type isolator and the tri-magnets type isolator were carried out under harmonic displacement and force excitation respectively.Results of the tests were compared with the transmissibility characteristics of the equivalent linear vibration isolation system.Therefore,the advantages of low frequency vibration isolation of the HSLDS vibration isolator based on permanent magnets type were verified.The experimental results show that the magnetic negative stiffness mechanism possesses a smaller transmissibility peak,a wider vibration isolation frequency band and a better low-frequency vibration attenuation performance.