Damaged cable identification method based on angle monitoring when bearing angular displacement changes with temperature

Abstract

The invention discloses a method for identifying a damaged rope based on angle monitoring in the presence of supporting seat angle displacement and temperature change. According to the method based on angle monitoring, the angle displacement of the supporting seat, the temperature of a rope structure and the ambient temperature are monitored to determine whether a mechanical calculation reference model of the rope structure is required to be updated to obtain a mechanical calculation reference module of the rope structure recorded with the angle displacement of the supporting seat, the temperature of the rope structure and the ambient structure, and a change matrix of monitored amount of a unit damage is obtained by calculating on the basis of the model. By the method, the non-inferior solution of the current nominal damage vector of a rope system is calculated according to approximate linear relationships among the current numerical value vector of the monitored amount, the current initial numerical value vector of the monitored amount, the change matrix of the monitored amount of the unit damage, the scaler quantity of the unit damage and the current nominal damage vector of the rope system to be solved, and accordingly, the position and the damage degree of the damaged rope can be accurately determined in the presence of supporting seat displacement and temperature change.

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, the angular displacement of the support (such as the rotation of the support around the coordinate axes X, Y, and Z is actually the support Angular displacement around the coordinate axes X, Y, Z), this method is based on angle monitoring to identify the support system of the cable structure (referring to all load-bearing cables, and all supporting members that only bear tensile loads, for convenience , this patent refers to all su...

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) and the angular displacement of the cable structure support. When the temperature of the cable structure changes and the angular displacement of the cable structure support Under these conditions, if the identification of supporting cables with health problems can be realized based on the monitoring of the monitored quantity, it will be of great value to the safety of the cable structure. At present, there is no public and effective health monitoring system and method to solve the problem. this problem

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