Nonlinear dynamic vibration absorption and electromagnetic energy dissipation device

Abstract

The invention discloses a nonlinear dynamic vibration absorption and electromagnetic energy dissipation device. The device comprises a box-shaped structure, a shape memory alloy spring, a shape memory alloy stranded wire, a mass block and two magnets; the top and the bottom of an outer box are each fixedly provided with one magnet to form a uniform magnetic field, the upper end of the spring is connected with the bottom of one magnet, the lower end of the spring is connected with the mass block, the stranded wire is inserted into the middle of the spring in a penetrating mode, and the mass block can swing in multiple directions; the spring and the mass block form a spring pendulum, the motion mode of the spring pendulum adopts a coupling mode of a spring vibration mode and an overall swinging mode, when internal resonance conditions are met, the phenomenon that one kind of vibration motivates the other kind of vibration can occur, and therefore the effect of nonlinear vibration absorption can be achieved. The swing frequency of the spring is in consistent with the main vibration frequency of a controlled structure, strong coupling of the vibration mode and the swinging mode of the spring pendulum is achieved, the internal resonance characteristics are achieved, and the optimal vibration absorption and reduction effect is achieved.

Description

technical field [0001] The invention relates to the field of structural engineering vibration control, in particular to a nonlinear dynamic vibration-absorbing electromagnetic energy-consuming device for reducing the vibration response of tower structures such as transmission towers. Background technique [0002] my country is a country with frequent natural disasters, and tower structures such as transmission towers often collapse and fail under the action of earthquake or wind load, causing huge economic losses. Therefore, it is of great significance to reduce the dynamic response of tower structures such as transmission towers and ensure their safe operation under earthquake or wind loads. Structural vibration control is to improve the mechanical properties of the structure by setting some control devices on the structure. When the structure is excited by wind load, earthquake, etc., these control devices will generate a set of passive or active control forces on the str...

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Problems solved by technology

If the excitation frequency changes slightly, the operating frequency may shift from the anti-resonance point to any resonance point, so the linear vibration absorber is not suitable for variable speed situations

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