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

Stay cable stay force measuring method based on vibration method using linear model

A linear model and measurement method technology, applied in the direction of tension measurement, etc., can solve the problems of mixed use operation difficulties, different definitions of measurement method parameters, and influence on measurement accuracy, etc.

Active Publication Date: 2015-11-11
哈尔滨开博科技有限公司
View PDF6 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to provide a method for measuring cable force based on a linear model of a vibration method, so as to solve the problem that the cable force test method based on a specific physical model assumption in the prior art is difficult to uniformly identify a variety of cable forces and different measurement methods. Parameter definitions are different, mixed operation is difficult, and problems affecting measurement accuracy

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
  • Stay cable stay force measuring method based on vibration method using linear model
  • Stay cable stay force measuring method based on vibration method using linear model
  • Stay cable stay force measuring method based on vibration method using linear model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0058] In the following, the method will be further described in detail by taking a tension test of a cable of model S4 as an example in conjunction with the accompanying drawings.

[0059] The model for the tension test is as Figure 4 , the two ends of the cable are loaded with tension through the numerical control jack. As can be seen from the figure, due to the indirect force transmission of the connecting screw, the boundary conditions (hinged, fixed) of the cable are difficult to visually identify.

[0060] Figure 5 It is a typical cable section, the cable model is S3J, and the cable section includes 3×7+3 steel wires. The cable in this example is S4 type, the cross-section includes 4 bundles of 4×7 steel wires, and the gap and the outside are wrapped by polyethylene (PE). Cable length l=11.57m, linear density m=5.59kg / m, cross-sectional area A=556mm 2 , the limit cable force T lim =1041.60kN, elastic modulus E=2.0×10 5 MPa. The section moment of inertia I is the...

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

PropertyMeasurementUnit
linear densityaaaaaaaaaa
areaaaaaaaaaaa
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention relates to a stay cable stay force measuring method based on a vibration method using a linear model which belongs to the technical field of construction engineering. The method provided in the invention aims to solve problems of prior art. The problems are illustrated as follows. In the prior art, a stay force measuring method, normally based on the assumption of a specific physical model, is difficult to realize a unified recognition of various stay forces and in different measuring methods, the definition of parameters also varies. It is also difficult to operate to mix different measuring methods for use. All these factors undermine measuring accuracy. The method of the invention is carried out as follows. Tensioning a stay cable with two grades of pulling forces; under each grade of pulling force, using a speed accelerator sensor to measure the speed acceleration signals under the action of environment excitation or people excitation; converting the signals into auto power spectrum patterns; substituting each grade frequency of the two grades of pulling forces and the tensioning force into a linear model; identifying linear model coefficients corresponding to each grade frequency and realize the recognition of model parameters. The recognized linear model and the natural vibration frequency of each grade make it possible to recognize the stay cable stay force. With the method provided in the invention, a relatively-high-accuracy measuring value of stay force can be achieved and the problem of recognizing physical parameters to measure stay force using a traditional vibration method can be avoided, thus making the method reduce the uncertainty of a stay force test.

Description

technical field [0001] The invention relates to a method for measuring the force of a vibrating cable, belonging to the technical field of structural engineering. Background technique [0002] Cable-stayed bridges, suspension bridges and hanger arch bridges all transfer the deck system and vehicle loads to the main force-bearing members through cables, collectively referred to as cable-supported bridges. The cable force vibration method measurement is an important technical means for the inspection and construction monitoring of cable-supported bridges. [0003] Two key problems need to be solved when the cable force test of the vibration method is used: 1) the identification of the natural frequency of the cable, and 2) the determination of the corresponding relationship between the cable force and the natural frequency. Under the conditions of existing measuring instruments and analysis means, the accuracy of measuring frequency can reach 0.005Hz. Therefore, the accuracy...

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 Applications(China)
IPC IPC(8): G01L5/04
Inventor 李大军陈少峰杨大伟高崇威曾森王建飞
Owner 哈尔滨开博科技有限公司
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