【摘要】 针对风电塔架结构内部有限的空间,设计一种新型减振系统。基于悬吊质量摆减振原理,利用形状记忆合金(SMA)的超弹性特性,将SMA丝与弹簧叠加成SMA阻尼器后并与悬吊质量摆复合,设计了一种形状记忆合金-悬吊质量摆阻尼器(SMA-SMPD)系统。研究了细部构造、减振原理和参数影响,并利用Matlab软件对单自由度体系在不同地震作用下的动力响应进行了数值模拟。结果表明:所设计的刚度和质量可调的SMA-SMPD是有效的。与结构受控频率相调时,将结构振动能量集中转换到SMA-SMPD上,可耗散结构振动能量,减震率可达30%～40%,且整体性能稳定,对结构动力响应控制效果显著。更多还原

【Abstract】 In view of the limited space in a wind power tower structure, a new type of seismic vibration control system is designed. Based on the vibration reduction principle of suspension mass pendulum damper(SMPD) and superelastic properties of shape memory alloy(SMA), a new SMA-SMPD system is designed using SMA wire and spring as well as SMPD into the system. The detailed structure, the vibration damping principle and the influence of parameters are analyzed, and the dynamic responses of a single degree of freedom(SDOF) system under different strong ground motions are simulated using Matlab. The results show that the designed SMA-SMPD with the tuned stiffness and mass are effective. When the natural frequency of the SMA-SMPD is tuned to be equal to the controlled structure frequency, the vibration energy of the structure is transferred to the SMA-SMPD system to dissipate the vibration energy of the structure, and the vibration reduction ratio can reach 30-40%. The entire structural performance is stable with a remarkable dynamic response control effect.更多还原