Abstract:

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.

Key words: dr y-fr iction joints, equivalent viscous damping, equivalent natural fr equency, energy transfer, passive vibr ation contr ol