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Additional bending moment vibration damping system for stay cable based on macro fiber composite material

A composite material and additional bending moment technology, which can be applied to controllers with specific characteristics, electric controllers, etc., can solve the problems of unsightly appearance, the vibration reduction effect of auxiliary cables is greatly affected by the environment, etc., to achieve precise adjustment of frequency and easy implementation. , the effect of reducing the amplitude

Inactive Publication Date: 2018-11-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the auxiliary cable method is easy to arrange, the vibration reduction effect of the auxiliary cable is greatly affected by the environment and is not beautiful. Therefore, the combination of reducing the influence of the external environment on the cable and changing the characteristics of the cable itself is an important issue in cable vibration control. one

Method used

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  • Additional bending moment vibration damping system for stay cable based on macro fiber composite material
  • Additional bending moment vibration damping system for stay cable based on macro fiber composite material
  • Additional bending moment vibration damping system for stay cable based on macro fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] figure 1 It shows the cable additional bending moment vibration damping system based on MFC, the cable 2 is connected between the bridge tower 4 and the bridge deck 5 through the fixed end 3 of the cable, and the MFC group 1 and the displacement sensor 6 are arranged on the cable 2 , the displacement sensor 6 is connected to the input end of the dSPACE real-time simulation system 9, the output end of the dSPACE real-time simulation system 9 is connected to the input end of the high-voltage amplifier 7, the output end of the high-voltage amplifier 7 is connected to the MFC group 1, and the dSPACE real-time simulation system 9 is connected to the computer 8 .

Embodiment 2

[0054] figure 2 Indicates the horizontal paste position of MFC. Four MFCs 13 are pasted symmetrically in pairs around the steel strands 10 of the cables. A casing 11 is provided outside the steel strands 10 , and a filler 12 is also provided between the steel strands 10 and the sleeves 11 .

Embodiment 3

[0056] image 3 It is a schematic flow chart of the cable additional bending moment vibration damping system based on MFC. (1) Firstly, determine the sticking position of the MFC and the sensor. Paste the pre-estimation of the position of the MFC and the sensor; (2) Establish the dynamic equation and the state space equation of the additional bending moment of the cable based on the MFC; (3) Since the cable is a flexible structure with a relatively dense frequency, the internal balance drop First-order method, construct a controllable and observable Gram matrix of the system with diagonal blocks dominant, solve the singular value of the system, compare the size of the singular value, if there is no situation that is obviously larger than other singular values, increase the number of MFC and sensors or change the number of MFC and Paste the position of the sensor until there is a singular value that is much larger than other singular values. Stop, retain the internal equilibriu...

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Abstract

Aiming at the vibration damping of a stay cable, the invention proposes a new method for symmetrically pasting a plurality of groups of macro-fiber composite (MFC) materials at a coaxial position of the stay cable and applying voltages in opposite directions to the MFC materials which are symmetrically pasted at the same position, so as to provide an additional bending moment for the stay cable, and reduce the vibration amplitude of the stay cable. The system can determine the acting mode of the additional bending moment generated by the MFC materials in a stay cable-MFC vibration damping system, so that a kinetic equation of the stay cable-MFC vibration damping system is built. The additional bending moment vibration damping method for the stay cable based on the MFC is characterized in that the MFC pasted on the stay cable is used for providing the additional bending moment, so the implementation is easy, and the MFC is easy to paste, and is convenient to arrange.

Description

technical field [0001] The invention relates to the technical fields of structural engineering and automatic control, in particular to a cable additional bending moment vibration damping system based on macro fiber composite materials. Background technique [0002] With the increasing development of traffic, people's requirements for the span and comfort of bridges are getting higher and higher, so cable-stayed bridges and suspension bridges have higher and higher requirements for the vibration reduction of cables. As one of the main load-bearing components of cable-stayed bridges and suspension bridges, cables play an important role in transmitting bridge deck loads, and the cables are characterized by small damping, large flexibility and wide natural frequency band. These characteristics make the cables very easy to generate various vibration forms under the action of external loads or bridge deck towers. Due to the long-term combination or single action of different vibr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 涂建维张家瑞付金海吴岸李新平
Owner WUHAN UNIV OF TECH
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