A Method for Identifying Slack Cables Based on Hybrid Monitoring During Angular Displacement of Bearings

Abstract

The method of identifying slack cables based on hybrid monitoring during the angular displacement of the support is based on the hybrid monitoring of multiple types of parameters. By monitoring the angular coordinates of the structural supports, it is determined whether it is necessary to update the mechanical calculation benchmark model of the structure. Only when the angular coordinates of the structural supports occur The mechanical calculation benchmark model of the structure is updated only when it changes, so as to obtain a new mechanical calculation benchmark model of the structure that takes into account the angular displacement of the structural support. Based on this model, the unit damage monitored quantity change matrix is ​​calculated and obtained. According to the approximate linear relationship between the current strain vector and the initial strain vector, the virtual unit damage strain change matrix and the current virtual damage vector, the virtual damaged cable is calculated and identified. After the real damaged cable is identified by the non-destructive testing method, the remaining The virtual damaged cable is the slack cable, that is, the cable whose tension needs to be adjusted, and the cable length to be adjusted can be determined according to the relationship between the degree of relaxation and the degree of virtual damage.

Description

technical field [0001] When there is an angular displacement of the support (for example, the rotation of the support around the coordinate axes X, Y, and Z is actually the angular displacement of the support around the coordinate axes X, Y, and Z), the present invention identifies based on the monitoring of the mixed equivalent The support cables in the cable system (referring to all support cables) of cable support structures (especially large-scale cable structures, such as large cable-stayed bridges and suspension bridges) that need to adjust the cable force, and give specific cable length adjustments, which belong to engineering structures security area. Background technique [0002] The cable system is usually a key component of cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges). Due to reasons such as relaxation, the cable force of the supporting cables usually changes after a period of time after the comple...

AI Technical Summary

Problems solved by technology

[0003] When the health state of the supporting cable system changes (such as relaxation, damage, etc.), in addition to the change of the cable force, it will also cause changes in other measurable parameters of the structure, such as the change of the cable force, which will affect the cable force. The deformation or strain of the structure will affect the shape or spatial coordinates of the cable structure, and will cause changes in the angular coordinates of any imaginary straight line passing through each point of the cable structure (for example, any one of the tangent planes at any point on the surface of the structure passes through this point The change of the angular coordinates of the straight line, or the change of the angular coordinates of the normal of any point on the surface of the structure), all of these changes contain the health status information of the cable system, so the characteristic parameters of these different types of structures can be obtained. The mixed monitoring of changes can be used to judge the health state of the structure. In the present invention, all the monitored structural characteristic parameters are collectively referred to as "monitored quantities". Since the monitored quantities are composed of a mixture of different types of measurable parameters of the structure, the present invention This is called mixed monitoring. In addition to being affected by the health status of the cable system, the monitored quantity will also be affected by the angular displacement of the cable structure support (which often occurs). At present, there is no public and effective health monitoring system and The method solves this problem