Power transmission tower vibration damper as well as preparation and use method thereof

Abstract

A power transmission tower vibration damper comprises a cylinder-shaped metal box body fixedly installed in the center of the top of a power transmission tower, a high-damping spring made of a martensite shape memory alloy is suspended in the center of an inner top plate of the metal box body, a solid steel ball is tied at the lower end of the high-damping spring, and elastic adhesive tapes are pasted to the inner side wall of the metal box body. According to the power transmission tower vibration damper, under the effect of external excitation, the high-damping spring of the damper conducts damping by depending on internal resonance of the swing modal and the vibration modal of the high-damping spring and the restoring force of the high-damping spring when the solid steel ball and the box body do not collide; when colliding with the box body under the effect of a dynamic load, the solid steel ball applies work by depending on collision force of the box body to the solid steel ball to conduct damping; and the mass ratio of the solid steel ball to the power transmission tower, the inner diameter and the height of the metal box body and the length and the strength of the high-damping spring are obtained through provided computational formulas, and the power transmission tower vibration damper can achieve the best damping effect.

Description

technical field [0001] The invention relates to power transmission engineering, in particular to a transmission tower shock absorber for alleviating the vibration of a transmission tower and a preparation and use method thereof. Background technique [0002] Transmission towers used to erect transmission lines will produce dynamic responses under wind loads and earthquakes, and even collapse in severe cases. Vibration reduction of transmission towers is an important measure to ensure their structural safety. [0003] CN102936926A patent document discloses a multi-dimensional collision energy-consuming mass pendulum damper that can be used for vibration reduction of transmission towers. The damper is composed of a mass ball suspended in a metal cylinder with a lower opening through a steel cable. Viscoelastic materials are attached to the inner wall of the metal cylinder, and the mass ball is used to generate inertial force to collide with the metal cylinder under the action ...

AI Technical Summary

Problems solved by technology

[0005] (1) The mass ball suspended by the steel cable does not have internal resonance characteristics, and only the inertial force generated by the vibration of the mass ball is used for vibration reduction, and the vibration reduction effect is not good

[0006] (2) The relationship between the design parameters when the damper achieves the best vibration reduction effect and the relevant technical parameters of the transmission tower is not given, and the designed device cannot be guaranteed to achieve the best vibration reduction effect

[0007] (3) The lower end of the damper is open, and the steel cable, mass ball and viscoelastic material layer are easily corroded and have poor durability

[0009] (1) Electromagnetic induction is used to consume energy, and the structure of the mass block is complicated; the permanent magnet will demagnetize after long-term use, which will affect the energy consumption and vibration reduction effect of the vibration reduction device

[0010] (2) The relationship between the design parameters when the device achieves the best vibration reduction effect and the relevant technical parameters of the transmission tower is not given, and it cannot be guaranteed that the designed device achieves the best vibration reduction effect

[0011] (3) Under the action of external excitation, the mass block may collide with the side of the box, which may cause damage to the device in severe cases

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