新型压电变摩擦阻尼器的研发与性能试验

Piezoelectric variable friction damper and its performance experiments and analysis

本文采用商用标准件叠层压电驱动器和圆形摩擦盘,研发了能提供水平任一方向可调摩擦阻尼力的新型压电变摩擦阻尼器,能与圆形隔震垫协同工作复合而成智能隔震系统。文中首先提出了新型压电阻尼器的基本结构,制作了试验室比例的模型;其次针对压电驱动器变形在微米数量级的特点和约束钢架的刚度特性,提出了基于有限元分析的形状系数和可调正压力计算方法。并用约束钢架变形试验验证了有限元分析的正确性;最后通过阻尼器性能试验提出了连续型的阻尼力计算模型,一种适合于实际工程应用的摩擦阻尼力模型。提出的新型压电摩擦阻尼器构造简单,阻尼力调节方便,响应速度快,特别是便于进一步增大阻尼力调节倍数,能够较大地推动压电阻尼器实用化进程。

In this paper,commercially available multilayer piezoelectric stack actuators are considered for driving variable friction damper.An independently developed smart damper is presented,which can slide in any horizontal directions,so it works together with circular seismic isolator and forms smart isolation system.Firstly,its working principle and designing are introduced,and a scale piezoelectric damper is manufactured and assembled.Secondly,the finite element analysis program ANSYS is put to use and then the deformation test is done to prove the correctness of the calculation.Finally,the performance experiment is carried out under varying voltage to identify its motion-independent characteristics on two-way slide.For the isolation structure,the continuous friction damping force model is proposed,and the performance test results are consistent with the theoretical model.The proposed piezoelectric damper has such advantages as simple configuration,convenient damping adjustability and rapid response,and in particular it is suitable for further transformation to increase the damping force.Therefore,it can promote the practical process of this damper.