Cable system health monitoring method in cable structure based on mixed monitor

Abstract

The invention relates to a health monitoring method for the cable system of cable structure, based on hybrid monitor, comprising that: based on the mechanical calculation reference model of the structure, the method processes a plurality of mechanical calculations while the calculation number equals to the cable number, wherein each calculation assumes that only one cable has units damaged and each calculation attains a calculation present digit vector of the monitored value (the following texts omits the description of the monitored value); each calculation present digit value is subtracted with an initial digit vector to obtain a digit variable vector; all digit variable vectors form an unit damage monitored value digit variable matrix. By calculating the similar linear relationship among the present digit vector with the initial digit vector, the unit damage monitored value variable matrix, the unit damage scalar and the present cable damage vector (formed by all cable present damage quantity), the non-inferior solution of the present cable damage vector can be calculated by a suitable algorism as multi-object optimization algorism and the like, thereby accurately finding the position of a damaged cable and the damage degrees thereof.

Description

technical field [0001] The invention identifies damaged cables in cable systems (referring to all bearing cables) of cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges) based on mixed monitoring of multiple types of parameters, and belongs to the field of engineering structure health monitoring . Background technique [0002] The cable system is usually a key component of the cable structure, and its failure often leads to the failure of the entire structure. Based on structural health monitoring technology to identify cable systems (especially large cable structures, such as large cable-stayed bridges, suspension bridges) in the cable system The damaged cable is a method with great potential. At present, the structural health monitoring technology mainly monitors the cable force, and identifies the damaged cable and its damage degree according to the change of the cable force. However, as far as a single cable is...

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Problems solved by technology

However, the health of each cable will not only affect the cable force of all cables, but also affect the deformation or strain of the cable structure, and also affect the shape or spatial coordinates of the cable structure, and will also cause tension at each point of the cable structure. Changes in the angular coordinates of any imaginary straight line (for example, changes in the angular coordinates of any straight line passing through the tangent plane at any point on the surface of the structure, or changes in the angular coordinates of the normal line at any point on the surface of the structure), all These changes include the health status information of the cable system, and there is no publicly reported system and method to realize the health monitoring of the cable system of the cable structure through the mixed monitoring of the changes in the characteristic parameters of these different types of structures.

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