Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A control method for multi-mode vibration of a cable

A control method and multi-mode technology, which is applied in the field of multi-mode vibration control of cable-stayed bridge cables and vibration control of cable structures, can solve bridge installation difficulties, difficulties in installation and maintenance, and high-order vortex vibration control of cables Ineffective and other problems, to achieve efficient control, easy maintenance and replacement

Active Publication Date: 2022-03-04
TONGJI UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual measurement results show that this method is not effective in controlling the high-order vortex vibration of the cables, and the method is difficult to install on bridges in the operation phase.
In addition, the method of installing a high-order vortex damper for controlling the cable at the end of the tower also has problems such as installation and maintenance difficulties; adding a damper at the end of the beam will affect the optimal parameters and vibration reduction effect of the original damper

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 control method for multi-mode vibration of a cable
  • A control method for multi-mode vibration of a cable
  • A control method for multi-mode vibration of a cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0032] like figure 1 As shown, the present invention firstly provides a damper and TMD combined control method, which is optimized for the multi-mode vibration of the cable. First, the cable-damper-TMD system analysis model is established considering the sag effect, and the complex eigenfrequency equation of the system is obtained.

[0033] With sag cable-viscous damper-TMD system such as figure 2 shown. The cable is placed horizontally, the chord length is L, the horizontal tension is H, the mass per unit length is m, and the axial stiffness is EA. The damper has a damping coefficient of c and is installed at a distance l from the anchorage end of the left cable 1 location.

[0034] The stiffness, damping and mass of the TMD are denoted by k d 、c d 、m d means that ω d is the natural circular frequency of TMD, and ξ is the damping rat...

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 provides a multi-mode vibration damper and a tuned mass damper (TMD) combination damping scheme and system parameter optimization design method for cable low-order wind and rain excitation and high-order vortex excitation. Dampers are arranged at two different positions on the cable, among which the damper controls the low-order wind and rain vibration, and TMD is aimed at the high-order vortex vibration. This method can solve the problem of high-order vortex vibration in the traditional single-point installation damper system on the cable. The parameter design includes the following steps: design the position and parameters of the damper according to the additional damping requirements of the modal vibration with the cable frequency below 3.0 Hz; The damper is close to the stagnation point of the vibration when the vibration is similar; the installation position and parameters of the TMD are determined according to the mode that the high-order vortex vibration is prone to occur. This method is beneficial to eliminate the hidden danger of high-order eddy vibration in the ordinary cable-damper system, and TMD has no influence on the optimal parameters and vibration reduction effect of the damper. The installation position of TMD is close to the cable end damper, which is convenient for installation, maintenance and replacement. It is suitable for vibration treatment of cables in new structures and cables in existing structures.

Description

technical field [0001] The invention belongs to the field of cable structures, and relates to the vibration control technology of the cable structure, in particular to the multi-mode vibration control technology of the cable of the cable-stayed bridge. Background technique [0002] Due to the characteristics of light weight, axial bearing capacity and high rigidity, stay cables have been widely used in the field of structural engineering, including cable-stayed bridges, suspension bridges, suspension rod arch bridges, and mast tower structures anchored by cables. Taking the typical cable-stayed bridge as an example, it has been widely constructed all over the world, especially in China, due to its aesthetic and economical advantages. As of 2019, a total of 55 cable-stayed bridges with a span of more than 500 meters have been built in the world, and my country has 36; a total of 47 cable-stayed bridges with a span of more than 500 meters are under construction, and my country...

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): G05D19/02E01D19/16E01D11/04
CPCG05D19/02E01D19/16E01D11/04
Inventor 狄方殿陈林孙利民
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com