Magnetic negative stiffness damper

Abstract

The invention relates to a magnetic negative stiffness damper. The magnetic negative stiffness damper comprises a conductive pipe, an installation shaft, a sliding bearing and one or more pairs of magnets arranged in the axial direction of the conductive pipe. Each pair of magnets comprises the first magnet and the second magnet with the geometric centers located in the same horizontal positions in a balanced state. The first magnets are installed inside the conductive pipe through the installation shaft and are controlled by the sliding bearing to move in the axial direction. The second magnets are fixed to the conductive pipe. The axial magnetization directions of the first magnets and the second magnets are the same, and the negative stiffness function is formed through the relative movement of the first magnets and the second magnets. The conductive pipe is located in the position symmetrical with the two ends of the second magnets, and an electric eddy current damping function is formed through the relative movement of the first magnets and the conductive pipe. The magnetic negative stiffness damper integrates negative stiffness and electric eddy current damping, is simple and compact in structure and is capable of being widely applied to vibration control of construction, mechanical and aerospace structures.

Description

technical field [0001] The invention relates to the field of ultra-precise damping, and more specifically relates to a magnetic negative stiffness damper. Background technique [0002] Structural vibration control refers to the protection of the main structural system against strong vibrations caused by dynamic loads. Various passive, semi-active or active mode dampers have been proposed for damping structural vibrations, such as viscous fluid dampers, viscoelastic dampers, metallic yield dampers, friction dampers, tuned mass dampers, magnetic flow dampers, Variable (magnetorheology, MR) damper, variable orifice damper, variable friction damper and active mass drive. Some of them have been successfully applied in civil, mechanical and aerospace engineering. Active and semi-active control techniques tend to achieve better control than passive dampers. The Linear Quadratic Regulator (LQR) algorithm, commonly used as an optimal control theory for active dampers, can generate...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a passive magnetic negative stiffness mechanism combined with negative stiffness and eddy current damping, which has a simple and compact structure, in view of the defects that existing negative stiffness dampers require sensors or complex structures

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