Unlock instant, AI-driven research and patent intelligence for your innovation.

A Working Method of Cable Variable Stiffness System Based on Macrofiber Composite Materials

A technology of composite materials and working methods, applied in instruments, bridges, bridge parts, etc., can solve problems such as unsightly appearance, large environmental impact, and cable vibration control, and achieve the effects of high test sensitivity, convenient implementation, and improved work efficiency.

Active Publication Date: 2019-08-30
WUHAN UNIV OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of changing the characteristics of the cable itself is an easier method to implement, but the traditional auxiliary cable method is greatly affected by the environment and is not beautiful, so the method of combining reducing the influence of the external environment with changing the characteristics of the cable itself is An Important Problem of Cable Vibration Control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Working Method of Cable Variable Stiffness System Based on Macrofiber Composite Materials
  • A Working Method of Cable Variable Stiffness System Based on Macrofiber Composite Materials
  • A Working Method of Cable Variable Stiffness System Based on Macrofiber Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] figure 1 It shows the cable variable stiffness 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 two MFC groups 1 are arranged on the cable 2 at equal intervals, and the displacement sensor 6 The sticking position is any position of 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, and the output end of the high-voltage amplifier 7 is connected to the MFC group 1. The purpose of arranging a plurality of MFC groups 1 in the axial direction of the cable 2 is to reduce the excessive attenuation of the tensile stress in the cable due to the internal friction of the cable.

Embodiment 2

[0042] figure 2 Indicates the horizontal paste position of MFC. Six MFC1 are pasted at equal intervals 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 casings 11 . A plurality of MFCs are pasted on the lateral direction of the cable to provide greater additional cable force, so that the additional cable force is evenly applied to the cable.

Embodiment 3

[0044] image 3 It is a schematic diagram of the cable-variable stiffness process based on MFC, (1) Paste and arrange MFC and displacement sensors on the cable to establish the cable-MFC system; (2) use finite element simulation and analytical method to obtain the cable-MFC system The functional relationship between the frequency and the voltage, take the minimum value of the two to fit the curve, as the control standard. (3) When there is an external load or bridge deck action, measure the vibration displacement of a certain position of the real-time cable through the displacement sensor, and transmit the measured data to the dspace real-time simulation system; (4) the data of the dspace real-time simulation system After computer calculation, the data is transmitted to the high-voltage amplifier; (5) The high-voltage amplifier provides voltage for the MFC, adjusts the voltage of the MFC to change the stiffness of the cable, and moves the natural frequency of the cable out of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a novel method for improving the stiffness of a cable by supplying voltage and adding a cable force to an MFC bonded to the cable in comparison with methods of changing the stiffness of cables. By means of the method, a function relationship between the voltage and the inherent frequency in a cable-MFC system can be determined, so that the inherent frequency of the cable ischanged according to the relationship to eliminate the frequency capable of causing a vibration effect to an external load or a bridge surface of a bridge tower, and therefore the amplitude is reduced. An MFC-based cable variable stiffness system is characterized in that the use of the MFC for changing the stiffness is easy to implement, and the MFC is easy to bond and convenient to arrange.

Description

technical field [0001] The invention relates to the technical fields of structural engineering and automatic control, in particular to a working method of a cable variable stiffness system based on macro fiber composite materials. Background technique [0002] With the development of the country's economy, the requirements for traffic are getting higher and higher, and the span of bridges is getting larger and larger, so the requirements for cables for bridges are also getting higher and higher. As one of the most important components of cable-stayed bridges and suspension bridges, cables are the main load-bearing and force-transmitting components. They are flexible components with small damping and have a wide natural frequency band. types of vibration. Under the combination or single action of these different forms, the cable is under fatigue load for a long time, which may cause fatigue damage of the cable or damage of the anchorage end. This will cause serious casualti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/16G06F17/50
CPCE01D19/16G06F30/23G06F2119/06
Inventor 涂建维朱倩莹高奎高经伟张家瑞
Owner WUHAN UNIV OF TECH