Passive damping device capable of achieving complex damping self-adaptive control characteristic

Abstract

The invention belongs to the technical field of building and bridge shock absorption and isolation, and particularly discloses a passive damping device capable of achieving a complex damping self-adaptive control characteristic. The passive damping device comprises an outer sleeve, a guide rod, a negative stiffness unit and a damping unit, wherein the guide rod extends into the outer sleeve from one end of the outer sleeve and can reciprocate in the outer sleeve; the negative stiffness unit is connected with the guide rod and used for providing negative stiffness for the guide rod; the damping unit is arranged in the outer sleeve and comprises a piston with a hole and an oil chamber, one side of the piston with the hole is connected with the tail end of the guide rod through a spring assembly, and the piston with the hole is arranged in the oil chamber and divides the oil chamber into two parts; and viscous liquid is contained in the oil chamber, and when the piston with the hole moves in the oil chamber, the viscous liquid flows between the two parts of the oil chamber through a piston hole in the piston with the hole. According to the passive damping device, through a negative stiffness device and a Maxwell damping model which are connected in parallel, the magnitude of control force provided by the passive damping device is irrelevant to the excitation frequency, and the complex damping self-adaptive control characteristic can be achieved.

Description

technical field [0001] The invention belongs to the technical field of shock absorption and isolation for buildings and bridges, and more specifically relates to a passive shock absorber capable of realizing complex damping adaptive control characteristics. Background technique [0002] In order to avoid excessive displacement of the base isolation layer under the excitation of low-frequency seismic waves, it is often necessary to add traditional dampers (such as oil dampers, metal yield dampers, etc.) to the isolation layer. However, under high-frequency seismic wave excitation, Too many conventional dampers have the potential to generate excessive damping forces, resulting in damage to the damper connections and / or an increase in the response of the superstructure to acceleration. In order to improve the high sensitivity of the traditional seismic isolation system (combination of seismic isolation bearing and traditional damper) to the excitation frequency, it is necessary...

AI Technical Summary

Problems solved by technology

However, it is difficult for the above-mentioned dampers to realize the adaptive control characteristics of complex damping, and some studies have pointed out that it may cause structural chattering; in addition, the hysteresis curve of the above-mentioned dampers is "triangular", and the mechanical behavior is strongly nonlinear, so The design process is relatively complicated, and the professional requirements for designers are relatively high, and it is relatively difficult to popularize and apply it in actual engineering structures

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