Health Monitoring Method of Cable System Based on Strain Monitoring During Bearing Angular Displacement

Abstract

The invention discloses a health monitoring method of a cable system based on strain monitoring in the angular displacement of a supporting seat. Based on the strain monitoring, a mechanical calculation reference model of a structure is determined whether to be updated or not necessarily again through monitoring an angular coordinate of the supporting seat of the structure; only when the angular coordinate of the supporting seat of the structure changes, can the mechanical calculation reference model of the structure be updated, so as to obtain a new mechanical calculation reference model of the structure reckoning in the angular displacement of the supporting seat of the structure; and on the basis of the model, a unit damage change matrix of a monitored quantity is calculated and obtained. According to the approximate linear relations existing among a current numerical vector of the monitored quantity, an initial vector of the monitored quantity, the unit damage change matrix of the monitored quantity, a unit damage scalar quantity and a current damage vector of the cable system to be solved, the non-inferior solution of the damage vector of a current cable can be calculated quickly by utilizing proper algorithms such as a multi-objective optimization algorithm and the like, and therefore, the position of a damaged cable and the damage degree of the damaged cable can be determined more accurately when the angular displacement of the supporting seat exists.

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, and this type of structure is expressed as a "cable structure" in the present invention for convenience. 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 the cable structure based on strain monitoring. Supporting system (referring to all load-bearing cables and all supporting rods that only bear tensile loads. For convenience, this patent refers to all supporting components of this type of structure as "cable system", but in fact the cable system It no...

AI Technical Summary

Problems solved by technology

After the health state of the cable system changes, it will cause the change of the measurable parameters of the structure, such as the deformation or strain of the cable structure will change. In fact, the change of strain contains the health state information of the cable system, which means that the structure The health status of the structure can be judged based on the strain data, and the damaged cable can be identified based on the strain monitoring (the monitored strain is called "monitored quantity" in the present invention, and the "monitored quantity" mentioned later refers to the monitored strain). In addition to being affected by the health status of the cable system, the monitoring 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 method to solve this problem.