Variable stiffness self-resetting damper based on shape memory alloy material

Abstract

The invention relates to a variable stiffness self-resetting damper based on a shape memory alloy material, and belongs to the field of structural vibration and control. Comprising a left connecting plate, a slotted cuboid, a limiting sliding block, a transmission rod a, an SMA tow, a right connecting rod and various blocking rods. According to the variable-stiffness self-resetting damper, the SMA wire bundles are in a stretched state no matter the variable-stiffness self-resetting damper is pulled or pressed, and the material utilization efficiency is high; the left end and the right end of the SMA tow are in an isosceles triangle deformation state due to constraint of the stop lever, the axial force amplification coefficient of the damper is an included angle between the direct stress section of the SMA tow and the axial direction of the damper, the included angle is reduced along with increase of axial deformation of the damper, the axial force amplification coefficient of the damper is increased, and therefore the variable stiffness effect of the self-resetting damper is achieved. The rigidity of the self-resetting damper can be flexibly adjusted by adjusting the distance between the two stop levers in the axial vertical direction of the damper; the damper is of an assembly type structure, is easy to install and maintain and has wide application prospects.

Description

technical field [0001] The invention relates to a damper, in particular to a variable stiffness self-resetting damper based on a shape memory alloy material, and belongs to the technical field of structural vibration and control. Background technique [0002] Shape memory alloy (SMA) is a new type of functional material, which has been widely used in the field of structural vibration control due to its good energy dissipation and superelastic properties. Shape memory alloys and other functional materials can achieve different seismic effects through different construction methods. For example, by combining shape memory alloys with disc springs, springs and other materials, a damper with stronger self-resetting ability can be manufactured; The combination of energy-consuming materials such as friction materials and metal supports can produce dampers with stronger energy-dissipation capabilities. In addition, the special mechanical structure of the shape memory alloy can brea...

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Problems solved by technology

[0004] Aiming at the problem that the existing shape memory alloy damper directly depends on the original axial stiffness of the SMA material, resulting in limited application scenarios, a special structural form is used to change the direct axial force of the SMA wire bundle, and a new method is proposed. Variable stiffness self-resetting damper based on shape memory alloy material, which has simple structure and convenient maintenance

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