Self-resetting piezoelectric semi-active friction damper

Abstract

A self-resetting piezoelectric semi-active friction damper comprises a shell and sleeves, wherein the shell comprises a top cover and a small box. One end of each sleeve is arranged on a base at the bottom of the small box, the other end of each sleeve is arranged on a top seat below the bottom of the top cover, a certain gap is reserved between the top seat and the other end of the corresponding sleeve, piezoelectric ceramic drivers are placed in the sleeves, leads of the piezoelectric ceramic drivers extend out of the damper through small grooves in the side faces of the sleeves and long and narrow hole grooves in the side walls of the small box and are connected with an external power supply, gaskets are arranged at two ends of each piezoelectric ceramic driver, a baffle is fixed to one side wall of the small box through a fixing screw, pre-pressure is applied by pre-tightening screws on the top cover, a balancing pull rod penetrates the baffle and is connected with the outer wall of the left sleeve, a connecting pull rod is fixed to the left side wall of the small box through a hexagonal nut, an actuating pull rod penetrates one side wall of the small box and is connected with the right sleeve, and reset springs are arranged on the balancing pull rod and the actuating pull rod respectively. A control system of the self-resetting piezoelectric semi-active friction damper is simple, the performance of the piezoelectric ceramic drivers is stable, the pre-pressure is conveniently applied, output energy is less, power output is high, and a piston can automatically reset.

Description

technical field [0001] The invention mainly serves the field of anti-seismic technology, and in particular relates to a self-resetting piezoelectric semi-active friction damper. Background technique [0002] The traditional anti-seismic system mainly starts from the structure itself, increases the stiffness of the structure by increasing the cross-sectional size of the components, increases the material strength of the components, or relies on the destruction of some additional components to consume and store energy, so as to improve the ability to resist earthquakes , this approach not only increases the economic investment, but also the anti-seismic effect is not ideal. [0003] Ordinary friction dampers are generally based on passive control for energy dissipation and shock absorption. The ordinary friction damper set up under the action of a large earthquake can not play the role of energy consumption and shock absorption under the action of a small earthquake due to th...

AI Technical Summary

Problems solved by technology

[0005] my country's patent No. CN101250909A discloses a piezoelectric friction smart damper, but it is inconvenient to apply the pre-pressure; secondly, no more effective measures are taken to protect the piezoelectric ceramic driver, and the piezoelectric ceramic driver is prone to shearing due to lateral force. At the same time, the relationship between the initial pre-pressure and the pressure applied by the piezoelectric ceramic driver is not superimposed, and the output effect is not ideal

[0006] Patent No. ZL201220633674.1 discloses a piezoelectric semi-active friction energy dissipator. Although the above-mentioned damper has been greatly improved, it does not consider the problem of wire handling of the piezoelectric ceramic driver when the piston slides, and there is no Reset function, cannot be recycled

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