A semi-active negative stiffness multi-dimensional vibration damping device

Abstract

The invention discloses a semi-active negative rigidity multidimensional vibration damping device. The semi-active negative rigidity multidimensional vibration damping device comprises an outer box body, wherein a tuned liquid damper, a negative rigidity mechanism and a magnetostrictive vibration generating unit are arranged inside the outer box body. The tuned liquid damper is a cylinder filled with damping liquid, the side surface of the cylinder is connected with a vibration absorption layer through a plurality of springs with one ends connected with rolling balls, the cylinder is arrangedon a plurality of metal balls, and the metal balls are arranged above a drum body. The negative rigidity mechanism is formed by the drum body and negative rigidity adjusting units radially arranged around the drum body; a giant magnetostrictive body is arranged at the bottom in the outer box body and connected with the drum body through a disc spring, and an induction coil and a permanent magnet are arranged around the giant magnetostrictive body from inside to outside to form the magnetostrictive vibration generating unit. An acceleration sensor is arranged at the bottom of the drum body andis connected with the magnetostrictive vibration generating unit, an electric energy storage and extraction unit, a controller and an excitation coil in series to form a closed loop.

Description

technical field [0001] The invention belongs to the field of vibration control of civil engineering, and in particular relates to a semi-active negative stiffness multi-dimensional damping device, which is mainly used for controlling the vibration response of long-span structures, long cantilevers and towering structures. Background technique [0002] my country's "Code for Seismic Design of Buildings" stipulates that the vertical seismic action should be considered for large-span and long cantilever structures when the seismic fortification intensity is 8 and 9 degrees, and for high-rise buildings when the seismic fortification intensity is 9 degrees. Vibration reduction control technology is to achieve the purpose of vibration reduction by installing some energy-consuming devices in specific parts of the structure. According to whether there is external energy input, it can be divided into passive control, active control and semi-active control. Among them, semi-active con...

AI Technical Summary

Problems solved by technology

The negative stiffness damping device is a new vibration isolation and vibration reduction system developed in recent years, which has a good effect on suppressing low-frequency vibrations, but there are few researches on semi-active control vibration damping devices with variable negative stiffness.

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