基于SMA阻尼器的长拉索系统振动控制研究

 基于形状记忆合金（SMA）的超弹性性能开展了以下研究：①设计研制了一种拉压型SMA 阻尼器，并通过试验得到了SMA 阻尼器的特征参数，进一步研究了SMA 阻尼器初应变、加载位移行程与阻尼器等效刚度、等效阻尼比以及耗能能力间的关系；②根据Hamilton原理，推导了SMA阻尼器 长拉索系统的非线性振动微分方程，并通过试验验证了理论推导的正确性；③研究了自由振动下SMA阻尼器对长拉索位移以及加速度响应的影响。研究结果表明，SMA 阻尼器对长拉索具有明显的减振效果，可以有效减少拉索的振动位移以及加速度幅值，大幅度提高了长拉索振动衰减速度。

Study on Vibration Control of Long Cable with SMA Damper

Based on the superelasticity of shape memory alloy (SMA),the following investigation has been developed:1) A kind of tension compression SMA damper is designed. In order to get the characteristic parameters of the SMA damper, furthermore, obtain the relationship of pre-strain and loading displacement with equivalent stiffness, equivalent damping ratio and energy dissipation capacity, an experimental study has been carried out.2) The Hamiltion principle is employed to derive the nonlinear vibration differential equation of SMA damper long cable system, then the accuracy of theoretic derivation is verified by experiment results.3) The influence of SMA damper on the displacement and acceleration of long cable is investigated under free vibration. Experimental results show that the effect of vibration reduction of SMA damper is so distinct that the response of displacement and acceleration of long cable with SMA damper is reduced effectively, and its vibration decay rate can be improved greatly.