Composite nonlinear energy trapping vibration damper

Abstract

The invention discloses a composite nonlinear energy trapping vibration damper. Two nonlinear tracks of the composite nonlinear energy trapping vibration damper are separately crossed in the X direction and the Y direction. A tubular track in the X direction is arranged on a bottom layer, and a tubular track in the Y direction is arranged on an upper layer. When two balls separately roll in respective pipes, reactive force which is compounded theoretically can point to an optional direction in a three-dimensional space, and complicated vibration damping requirements for the vibration damper inwork can be met. Stopping covers which are fixedly provided with high-damping rubber are separately mounted at two ends of each track, and thus, energy dissipation during impacting is enhanced. In addition, a permanent magnet is embedded in the balls, and when the balls roll in the pipes, a movable magnetic field can be formed. When the movable magnetic field is intersected with the metal pipes,mutual cutting of a magnetic induction line and a conductor is caused, thus, eddy current is generated in the metal pipes, electromagnetic force generated by the eddy current can be equivalent to a viscous damping, and thus, energy is dissipated by an electromagnetic effect.

Description

technical field [0001] The invention belongs to the field of anti-swing of lifting system of crane ship, wind resistance and earthquake resistance of buildings and bridges, and more specifically relates to a composite nonlinear energy well vibration damping device, which utilizes a passive control system without inputting external energy. Under certain circumstances, the control force is provided through the interaction between the anti-swing device and the controlled device / structure, so as to achieve the purpose of suppressing the swing of the hanging load system or reducing the vibration of the structure. Background technique [0002] When engineering ships are used for installation and construction work under complex sea conditions, the forced vibration amplitude generated by the hook is too large. The characteristic is translation (pendulum + rotation). The goal that needs to be controlled is to reduce the horizontal and vertical swings of the hook and improve the effi...

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Problems solved by technology

[0003] The traditional nonlinear energy well is a passive energy absorber consisting of an auxiliary mass body and a nonlinear track, which can reduce the vibration of a fixed structure excited by shock, but in a swinging structure, the vibration amplitude is too large, and its reaction There are few directions where the force can be directed, and the vibration reduction effect is not significant enough, so it is difficult to apply to complex vibration reduction or anti-swing requirements

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