Progressive health monitoring method for cable system based on strain monitoring during generalized displacement of support

Abstract

The invention provides a progressive health monitoring method for a cable system based on strain monitoring during generalized displacement of a support. Whether a mechanics calculation benchmark model of the structure requires to be updated against is decided by monitoring of a generalized coordinates of the structural support; considering the similar linear relationship among the current data vector of the monitored quantity and the initial value vector of the monitored quantity, the unit damage monitored quantity change matrix and the current nominal damage vector, in order to overcome the defects, a method using the linear relationship to approach the nonlinear relationship by section is adopted so that a large section is divided into a plurality of continuous small sections; the linear relationship in each small section is sufficiently accurate; and suitable algorithms such as a multi-objective optimization algorithm and the like can be utilized in each small section so as to calculate the non-inferior solution of the damage vector of the current cable, thus more exactly determining the position and the damage degree of a damaged cable.

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 a generalized displacement of the support (for example, the generalized displacement of the support refers to the linear displacement of the support along the X, Y, and Z axes and the angular displacement of the support around the X, Y, and Z axes; corresponding to the generalized displacement of the support, the generalized coordinates of the support Refers to the coordinates of the support about the X, Y, and Z axes and the angular coordinates of the support about the X, Y, and Z axes), the invention discloses a progressive method to identif...

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 generalized 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.

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