新型SMA复合悬摆减震系统对小雁塔减震控制分析

Analysis of SMA-SPDS vibration control for the Small Wild Goose Pagoda

为了对现存的古塔建筑进行有效地抗震保护,根据悬摆减震原理,结合形状记忆合金,设计并制作了一种新型形状记忆合金复合悬摆减震系统(shape memory alloy-suspension pendulum damping system,SMA-SPDS),并对该减震系统进行了动力测试。采用有限元软件ANSYS建立小雁塔模型结构减震控制模型,并将模拟分析值同试验结果作对比,验证减震控制模型的可靠性,同时,将该控制方法进一步应用于小雁塔原型结构。结果表明:本文研发的SMA-SPDS频率和阻尼均可调可控,系统性能稳定,减震效果明显;小雁塔模型结构减震控制模拟计算值与试验值基本吻合;随着控制模态阶次的提高,需要SMA-SPDS的数量增加,对小雁塔结构的控制效果也明显提高。

To enable anti-seismic protection of existing ancient pagodas,a new shape memory alloy-suspension pendulum damping system(SMA-SPDS)is designed and manufactured based on suspension pendulum damping theory and a shape memory alloy.The system is then examined using dynamic tests.To verify reliability of the vibration control model,the finite element software ANSYS is used to establish a vibration control model for the model structure of the Small Wild Goose Pagoda,and simulation analysis values are compared with experimental results.In addition,the vibration control method is further employed with a prototype structure of the Small Wild Goose Pagoda.Results show that frequency and damping of the SMA-SPD are both adjustable and controllable;the system performance is stable,and the damping effect is obvious.Furthermore,simulative calculation values are basically consistent with experimental results.Therefore,by improving the controlling mode order,quantity demands for SMA-SPDS will increase,and the controlled effect for the Small Wild Goose Pagoda structure will also be visibly improved.