Pulley type tuned mass eddy current damper

Abstract

The invention relates to an eddy current damper, in particular to a pulley type tuned mass eddy current damper. The pulley type tuned mass eddy current damper is characterized by comprising a mass block, the mass block is connected with a spring assembly through a pull rope and a pulley block, the pulley block comprises a movable pulley, the spring assembly is fixedly connected with the lower part of the movable pulley, the mass block is fixedly connected with a magnetic steel back plate and magnetic steel, and the mass block can drive the magnetic steel and a conductor plate to move relative to each other and generate eddy current. According to the pulley type tuned mass eddy current damper, the pulley block is additionally arranged, and the corresponding relation between static elongation and frequency is changed through the pulley block, so that the static elongation of the spring is reduced. Therefore, the tuned mass eddy current damper can break through the limitation of installation space, and the applicable frequency range of the tuned mass eddy current damper is expanded.

Description

technical field [0001] The invention relates to an eddy current damper, in particular to a pulley type tuned mass eddy current damper. Background technique [0002] At present, the mainstream technology for suppressing the vibration of large engineering structures is still the most reliable passive control, and the main forms are tuned mass dampers (Tuned Mass Damper, TMD for short) and various energy-dissipating dampers. For the vibration of a specific frequency, the use of TMD can often achieve a better vibration reduction effect. [0003] TMD is mainly composed of mass unit, stiffness unit, damping unit, etc. It converts the structural vibration into the vibration of the TMD mass block by tuning its own frequency to make it close to the structural frequency, and dissipates energy through the damping unit to achieve the purpose of vibration reduction . [0004] However, there is a static elongation in the vertical TMD (that is, the spring is deformed under the action of ...

AI Technical Summary

Problems solved by technology

However, the height of the internal space of the main girder of long-span bridges often does not exceed 9m, and many low-frequency TMDs cannot be installed

In order to solve the problem of excessive static elongation, some technical means have been proposed. The operating frequency of TMD in Tokyo Bay Bridge, Japan is 0.33Hz, and the static elongation of the spring original has reached 2.27m. The length of the spring original is shortened by using a lever mechanism. to 0.45m, but the starting friction of the lever mechanism is relatively large

The Chinese patent with the application number CN202010475626.3 proposes a "low-frequency mass-tuned shock absorber", which uses a multi-segment spring combination to achieve the purpose of reducing the static elongation of the spring. However, it is difficult to adjust the frequency of the device, which is likely to cause TMD vibration reduction. detuning

The Chinese patent with the application number CN201710432627.8 proposes "a permanent magnet ultra-low frequency vertically tuned mass damper". Converted to high-speed rotation of the flywheel, but this method has limited ability to reduce the static elongation of the spring

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