Piston type SMA-piezoelectric composite variable friction damper

Abstract

Disclosed is a piston type SMA-piezoelectric composite variable friction damper. The damper mainly comprises an outer cylinder barrel, an upper cylinder cover, an outer end piston, a curve friction steel plate, a connection rod, a sliding shaft, an SMA wire rope, an auxiliary spring A, a prepressing bolt, an adjusting nut, a piezoelectric ceramic driver, a force sensor, a flat screw, a connection bolt, a flat end fastening screw, an SMA wire rope fixing bolt, a lower cylinder cover, an inserting bolt, an annular fixing button, a middle piston, an open hole, a spring support A, a round groove, a friction material, a cylindrical guide rod, a guide rod siding bin, threads, an adjusting bolt, a clamp protrusion, a stop block, a sliding groove, a sliding bin cover, a wire, a power inlet port, a spring support B, a spring support C, a spring support D and an auxiliary spring B. The damper is simple in structure and easy to achieve and has the effects of deformation adjusting through voltage, fast and reliable motion responses, large driving force and good self reset. The magnitude of precompression can be adjusted precisely. Energy dissipation and earthquake attenuation requirements under earthquakes of different intensities can be met.

Description

technical field [0001] The invention belongs to the field of shock absorption control for structural engineering, and relates to a piston-type SMA-piezoelectric compound variable friction damper, especially for suppressing the structural vibration response of engineering structures under various earthquakes to achieve energy dissipation and shock absorption Control effect. Background technique [0002] As a new type of material, shape memory alloy (SMA) has the advantages of durability, corrosion resistance and self-resetting, but the equivalent viscous damping of SMA is not enough to make it the only damping device. When the seismic control device based only on shape memory alloy is subjected to dynamic load, the energy dissipation provided by it will be relatively small. Friction dampers are simple in structure, easy to install, good in energy consumption, and their performance is not affected by temperature, so they are commonly used in building structures. However, the...

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Problems solved by technology

However, the traditional friction damper has a single structure and no self-resetting ability. It can only be reset by its own stiffness. The friction force provided is a constant value, and the energy consumption effect is not good. There will be a locking phenomenon, and it cannot play the function of energy consumption and shock absorption

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