Stayed cable vibration damper and design method for apparent mass rotating electromagnetic damper

Abstract

The invention belongs to the technical field of engineering structure control, and in particular relates to a stayed cable vibration damper and a design method for an apparent mass rotating electromagnetic damper. The stayed cable vibration damper comprises a damping device and a transmission mechanism, the transmission mechanism is used for connecting the stayed cable and the damping device, the design method comprises the steps that the fundamental frequency of the stayed cable is determined; the installation location of the apparent mass rotating electromagnetic damper is determined; the damping parameters of the apparent mass rotating electromagnetic damper is calculated; and the stiffness parameters of the apparent mass rotating electromagnetic damper is calculated. According to the stayed cable vibration damper and the design method for the apparent mass rotating electromagnetic damper, a ball screw is utilized to effectively improve the rotational speed of the rotating electromagnetic damper, the equivalent damping coefficient of the damper is improved, and the energy consumption efficiency of the electromagnetic damper is improved; and an inertia flywheel mounted on a rotating shaft of the electromagnetic damper generates an apparent mass effect, the apparent mass effect is amplified through a ball screw mechanism, the stayed cable vibration damping mechanism is provided passive negative stiffness control characteristics, and the vibration damping effect of the stayed cable is effectively improved.

Description

Technical field [0001] The invention belongs to the technical field of engineering structure vibration control, and in particular relates to an apparent mass rotary electromagnetic damper stay cable vibration damping device and a design method. Background technique [0002] Cable-stayed bridge cables are prone to large wind vibration, wind and rain vibration and parametric vibration. There are three main categories of cable vibration reduction: aerodynamic measures, structural measures and mechanical damping measures. Compared with aerodynamic and structural measures, mechanical damping measures are a broader-spectrum stay-cable vibration reduction measure, and are most widely used in practical engineering. According to the internal energy dissipation materials of the damper, the commonly used damping dampers for stay cables can be divided into: high damping rubber damper, viscous shear damper, oil damper, magnetorheological (MR) damper and magnetic damper Wait. The built-in h...

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Problems solved by technology

[0005] The present invention aims at the vibration reduction measures of the existing dampers, although to a certain extent it solves the vibration problem of the existing cable stays, but there are still (1) limited by the installation position of the cable stay dampers, the vibration reduction of the ultra-long cable stays Facing the challenge and difficulty of insufficient additional modal damping ratio; (2) The existing conventional damper has built-in silicone oil or magnetorheological fluid, and there is a possibility of oil leakage failure and performance degradation after long-term operation; (3) The damping effect is better The cable-stayed cable semi-active control system is too complicated to be popularized and applied in practical engineering. A kind of apparent mass rotating electromagnetic damper cable-stayed vibration reduction device and design method is proposed.

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