Approximate identification method for damaged cables based on angle monitoring when temperature changes

Abstract

The invention relates to a damaged cable approximant identification method on the basis of the angle monitoring during temperature variation. According to the damaged cable approximant identification method, on the basis of the angle monitoring, the temperatures of cable structures, the environment temperature and the damage degrees of damaged cables are monitored to determine whether a mechanical calculation reference model of the cable structures needs to be updated; only when the temperature is changed and (or) the damage degrees of the damaged cables are high, the mechanical calculation reference model of the cable structures is updated so as to obtain a new mechanical calculation reference model of the cable structures, in which the temperature is counted; on the basis of the new model, a value change matrix of a unit damage monitored quantity is obtained by calculation; and according to approximate linear relations between a current value vector of the monitored quantity and a current initial value vector of the monitored quantity, the value change matrix of the unit damage monitored quantity and a current nominal damage vector to be obtained, a noninferior solution of the current nominal damage vector can be rapidly calculated by utilizing algorithms such as a multi-objective optimization algorithm and the like, so that when the temperature is changed, the positions and the damage degrees of the damaged cables can be accurately determined.

Description

technical field [0001] Cable-stayed bridges, suspension bridges, truss structures and other structures have one thing in common, that is, they have many parts that bear tensile loads, such as cable-stayed cables, main cables, slings, tie rods, etc. , cables, or rods that only bear tensile loads are supporting components. For convenience, this method expresses this type of structure as a "cable structure". As the ambient temperature changes, the temperature of the cable structure will also change. When the temperature of the cable structure changes, this method is based on angle monitoring to identify the supporting system of the cable structure (referring to all load-bearing cables and all supporting For the rods under tensile load, for the sake of convenience, this patent refers to all supporting components of this type of structure as "cable system", but in fact, the cable system not only refers to the supporting cables, but also includes rods that only bear tensile loads ,...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health status of the cable system, the monitored quantity will also be affected by the temperature change of the cable structure (which often occurs). The identification of damaged cables is of great value to the safety of cable structures. At present, there is no public and effective health monitoring system and method to solve this problem.

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