Composite damper based on chiral structure

Abstract

The invention relates to a composite damper based on a chiral structure. The composite damper comprises a fixing barrel, a fixed vertical plate, a movable end plate, shape memory alloy wire bundles, a variable-order cylinder, a viscous-elastic material layer, a fixing circular ring, tough strips, an SMA tow clamp, a lug plate and a spiral spring. When a structural object vibrates, the two ends of the composite damper are subjected to axial repeated loads, the movable end plate and the fixed vertical plate generate relative displacement, a four-chirality system formed by the tough strips drives the variable-order cylinder to generate plane rotation relative to the fixing circular ring, so that the viscous-elastic material layer generates reciprocating shear deformation for energy dissipation, meanwhile, the shape memory alloy wire bundles are in a stretched state, the characteristics of hyperelasticity and high damping are provided, the SMA wire bundles and the viscous-elastic material layer jointly consume energy, so that the damping performance of the composite damper is improved, after vibration, due to the good self-recovery function of the SMA, the system recovers to the original shape, and the self-reset function is achieved.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, and in particular relates to a composite damper based on a chiral structure. Background technique [0002] In recent years, in the face of increasingly serious energy shortages and climate warming, wind energy, as a clean and renewable new energy, has become increasingly important and has been vigorously developed. The wind turbine tower, as the main facility for wind power generation, is different from the general towering structure. In addition to external loads such as strong wind and earthquakes, the main reason for the vibration of the tower structure is that the wind turbine is in operation. Excitation of the structure, which is mainly a square mode shape due to the cyclic variation of the blade's gravity and rotational direction. [0003] At present, in engineering applications, tuned mass dampers or tuned ball dampers are often used to achieve the structural vibratio...

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Problems solved by technology

[0003] At present, in engineering applications, tuned mass dampers or tuned ball dampers are often used to achieve the structural vibration reduction effect of the tower under external excitation. No specific solution yet, but since the square vibration mode contributes significantly to the overall structure vibration mode, this problem cannot be ignored

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