由摩擦阻尼铰实现桁架结构的被动减振研究

 研究利用一种摩擦力随振动幅值的增大而增大的阻尼铰进行结构振动的被动控制。首先分析了含干摩擦约束铰结构单体梁的振动特性，并给出了系统随振动幅值变化的等效固有频率和粘性阻尼的定量表达式，然后建立了在桁架结构中设置此种摩擦铰的振动方程，分析了系统的动力特性，由计算结果发现，这种摩擦铰具有良好的阻尼特性；通过这种非线性元件，不仅通过滑移时消耗能量，而且可以将能量由低阶模态转移到高阶模态来加速振动衰减。

RESEARCH ON PASSIVE VIBRATION CONTROL OF TRUSS STRUCTURES BY DISPLACEMENT DEPENDENT DRY FRICTIONAL JOINTS

A new type of joint, which offers a friction force dependent on the amplitude of displacement,is proposed to suppress the vibration of structures. Firstly, the vibration mechanism was clarified in a single beam, the equivalent viscous damping and natural frequency were obtained, and the joints can make the system have the behavior of a rigid spring. Secondly, in the truss structure, it was found that it can keep its high stiffness and static shape accuracy at low external loads and vibrating levels. When the response exceeds a certain level, the joint starts slipping, introducing friction damping and nonlinearity. This nonlinearity can also transfer energy from lower mode to higher modes to result in a quick damping of the entire vibration.