Magnetic negative stiffness damper stay cable vibration reduction device and design method

Abstract

The invention belongs to the technical field of engineering structure vibration control, and particularly relates to a magnetic negative stiffness damper stay cable vibration reduction device and a design method. The device comprises a supporting frame, a magnetic negative stiffness mechanism, a rotary eddy current damping mechanism and a transmission mechanism. The design method comprises the steps that the vibration frequency of a stay cable is determined; the mounting position of the stay cable vibration reduction device of the magnetic negative stiffness damper is determined; a stiffness parameter assembly of the stay cable vibration reduction device of the magnetic negative stiffness damper is designed; and a damping parameter assembly of the stay cable vibration reduction device of the magnetic negative stiffness damper is designed. The rotating speed of a rotary eddy current damping element is increased through a ball screw, and the energy consumption efficiency of the magnetic negative stiffness damper is improved; the quasi-constant negative stiffness overcomes the defect that an existing negative stiffness damper is difficult to design accurately due to the fact that the negative stiffness nonlinear characteristic is obvious; the negative stiffness effect of a magnetic negative stiffness element is amplified through the ball screw mechanism, and the multi-mode vibration control effect of the stay cable is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of vibration control of engineering structures, and in particular relates to a vibration reduction device and a design method for a stay cable of a magnetically induced negative stiffness damper. Background technique [0002] The cables of cable-stayed bridges are prone to large-scale wind vibration, wind and rain vibration and parametric vibration. There are three main categories of cable-stayed vibration reduction: aerodynamic measures, structural measures and mechanical damping measures. Compared with aerodynamic and structural measures, mechanical damping measures belong to a broader spectrum of cable-stayed vibration reduction measures, and are most widely used in practical engineering. According to the internal energy-dissipating materials and principles of the damper, the commonly used vibration dampers for stay cables can be divided into: high-damping rubber dampers, viscous shear dampers, oil dampe...

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Problems solved by technology

Relevant studies have confirmed the vibration reduction effect of negative stiffness dampers, but viscous damping units with insufficient durability are generally used at present, and there are deficiencies in flexible and adjustable stiffness parameters, which restricts the popularization and application of engineering to a certain extent.

[0004]In summary, although the existing damper vibration reduction measures have solved the existing cable vibration problem to a certain extent, the following problems still exist: (1) Due to the limitation of the installation position of the cable damper, the vibration reduction of super-long cable stays faces the challenge and difficulty of insufficient additional modal damping ratio; (2) the existing damper vibration reduction measures cannot meet the requirements of multi-mode vibration reduction (3) Existing negative stiffness dampers have deficiencies in durability and flexible adjustment of stiffness parameters, making it difficult to be popularized and applied in practical engineering; (4) Existing negative stiffness dampers have obvious negative stiffness nonlinear characteristics, making it difficult to accurately design

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