Viscous damper based on piezoelectric variable friction

Abstract

The invention provides a viscous damper based on piezoelectric variable friction. The viscous damper comprises a cylinder barrel, a piston is arranged in the cylinder barrel, the piston is connected with a piston rod, a laminated piezoelectric actuator is arranged in the piston, and the laminated piezoelectric actuator is perpendicular to the piston rod but not intersected with the piston rod. According to the viscous damper, the laminated piezoelectric actuator is arranged in the viscous damper, electric energy can be converted into mechanical energy under a direct piezoelectric effect, in other words, electric current is conducted on laminated piezoelectric ceramics, the deformation quantity of the piezoelectric ceramics is changed, stress acting on friction plates is changed, and therefore the force for pushing the piston rod is changed, the energy consumption of the viscous damper is increased, and meanwhile, additional rigidity can be given to a structure, and the structure is assisted in resisting external loads. The technology has the advantages of high flexibility, high stability, high precision, long service cycle and the like, and can be used for solving the problems that the viscous damper at low frequency is low in energy dissipation capacity and cannot provide extra rigidity for the structure.

Description

technical field [0001] The invention belongs to the fields of structural engineering and vibration control, and in particular relates to a viscous damper based on piezoelectric variable friction. Background technique [0002] Frame structures are widely used in civil buildings. Under strong external effects such as earthquakes, the safety of frame structures is related to the lives and property safety of many people. The code requires frame structures to be designed with the goal of "not damaged by minor earthquakes, repairable by moderate earthquakes, and not collapsed by major earthquakes", following the ideas of "strong columns and weak beams", "strong shear and weak bends", and "strong joints and weak members". . However, in the face of a major earthquake, the structural damage is still very large. The traditional reinforcement methods, such as enlarging the cross-section method, reinforcing intercept point method, and bonded steel reinforcement method, are all based on...

AI Technical Summary

Problems solved by technology

But it has certain disadvantages. Firstly, it will increase the damping of the structure when it is installed in the structure, but it will not provide stiffness to the structure; secondly, in the low-frequency structural vibration, the energy dissipation provided by the viscous damper is too little. A large amount of energy can be dissipated by the structure, and the damper cannot play its due role

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