Self-resetting SMA-viscous vibration reduction damper

Abstract

The invention discloses a self-resetting SMA-viscous vibration reduction damper. The damper comprises a head connecting lug ring, a piston rod, a head sealing cover, a piston, a viscous damping medium, a cylinder body outer wall, a middle sealing cover, a spring pressing plate, an SMA spring, a guide hollow rod, a tail sealing cover and a tail connecting lug ring. The self-resetting SMA-viscous vibration reduction damper provided in the invention has advantages and positive effects that 1, most of input vibration energy can be dissipated; 2, the SMA spring can dissipate low-frequency or ultrahigh-frequency vibration energy, and meanwhile, the piston can be recovered to an original position to eliminate residual deformation; 3, the rigidity of the damper can be adjusted by adjusting pre-pressure of the pre-pressing spring as required; and 4, mounting and dismounting are simple and maintenance is easy.

Description

technical field [0001] The invention belongs to the technical field of civil engineering vibration damping devices, in particular to a self-resetting SMA-viscous vibration damper. Background technique [0002] In the field of anti-seismic and wind-resistant bridge engineering, installing vibration-absorbing devices between bridge piers and main girders or cable-stayed bridge parts can effectively dissipate the input vibration energy, thereby reducing the vibration response of the bridge. At present, there are viscous dampers, metal dampers, and friction dampers in the field of civil engineering, among which viscous dampers are widely used in bridges because of their strong energy dissipation capacity, stable performance, and low cost. Seismic and wind-resistant engineering. However, the viscous damper also has certain defects. Since the viscous damper is a speed-dependent damper, its energy dissipation and shock absorption effect is not good under low-frequency or ultra-hig...

AI Technical Summary

Problems solved by technology

However, the viscous damper also has certain defects. Since the viscous damper is a speed-dependent damper, its energy dissipation and shock absorption effect is not good under low-frequency or ultra-high-frequency loads, and the viscous damping effect is not good after the vibration process is over. The piston of the actuator cannot return to the original installation position, resulting in a certain residual displacement of the structure

[0003] Shape memory alloy SMA (Shape memory alloys) is a widely used intelligent material with superelastic properties. The material allows large deformation and can recover by itself. The effect of speed on the energy dissipation capacity of SMA is not obvious, but its disadvantage is that the overall energy dissipation capacity of the material is lower than that of viscous dampers, so the application in the field of seismic and wind resistance of bridge engineering is limited to a certain extent

Images