【摘要】 根据形状记忆合金 (SMA)的超弹性特性 ,设计、制造了一种SMA复合摩擦阻尼器 ,该阻尼器利用SMA超弹性阻尼与SMA丝的约束作用使阻尼器内部产生摩擦来共同耗散振动能量 .介绍了阻尼器的结构构造及工作原理 .通过试验研究了加载频率、位移幅值对阻尼器力学性能的影响 .试验结果表明 ,在试验频率范围内 ,阻尼器的刚度、输出力、耗能等主要力学参数随加载频率的改变而变化较小 ;位移幅值是影响这些力学参数的主要因素 ,当阻尼器在小位移的情况下 ,其刚度变化较小 ,而输出力和耗能与位移基本成线性关系 .但在大位移的情况下 ,阻尼器的输出力变化较小 ,而其割线刚度减小 ,耗能有大幅度的增加 .分析表明 ,该SMA复合阻尼器是一种位移相关性的变刚度阻尼器更多还原

【Abstract】 Based on superelastic property of shape memory alloy (SMA), a new SMA damper is designed and manufactured. The damper dissipates vibration energy by means of SMA superelastic damping and the friction between its inner members. I ts construction and principle are introduced. Experiments were taken to investig ate the influence of frequency and displacement amplitude on the dampers mecha nical behaviors. The results show that, in the range of experimental frequencies , the frequencies have slight effects on SMA dampers mechanical parameters suc h as the stiffness, control force, dissipated energy; displacement amplitude is the major factor that affects SMA dampers mechanical behaviors. Under small disp lacement the dampers stiffness has no change and its control force and dissipa ted energy increase linearly with displacement; on the other hand, under large displacement the dampers control force has slight change and its secant stiffn ess reduces, however, its dissipated energy increases greatly. It can be conclud ed that the SMA damper introduced is a displacement correlated and variable st iffness damper.更多还原