双面TiNi形状记忆合金环阻尼器的振动响应特性

Vibration Characteristics of a Double-direction TiNi SMA Ring Damper

应用两组奥氏体态TiNi合金环作为耗能元件设计了一种新型阻尼器。介绍了该阻尼器的结构特点及工作原理，利用振动台试验测试了合金环层数、纵向预变形及载荷对该阻尼器的振动响应特性的影响。研究结果表明，该阻尼器具有较复杂的振动响应变化规律，不同于单自由度系统，在低频段（0～10Hz），振动过程传递率始终小于1，即始终处于隔振区，表明此时该阻尼器具有优良的减振能力；同时增加合金环层数和纵向预变形可有效改善其减振效果。

Using two groups of austenitic TiNi alloy rings as the energy dissipation components, a new type of damper was designed, and its structure and work principle were introduced. The effects of the number of rings, longitudinal pre--deformation and the load on its vibration characteristics were measured by the vibration system. The results indicate that the vibration characteristics of the double --direction ring damper are complicated and different from that of the SDOF （single degree of free- dom） system. At low frequency range （0-10Hz）,the transmissibility is almost less than 1 ,that is to say, the vibration system is under vibration isolation area. The results show that the damper possesses a high damping capacity. Moreover its damping capacity can be improved by increasing the number of rings and longitudinal pre--deformation.