Progressive health monitoring method for cable system based on strain monitoring during generalized displacement of support
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A support generalized displacement and strain monitoring technology, applied in the field of progressive health monitoring of cable systems based on strain monitoring during the generalized displacement of supports
Inactive Publication Date: 2011-10-19
JIANGSU XINSHENG BELLOW
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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 monitorin...
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[0113] For the health monitoring of the cable system of the cable structure when there is a generalized displacement of the support, the invention discloses a system and method capable of reasonably and effectively monitoring the health status of each cable of the cable system of the cable structure. The following descriptions of embodiments of the invention are merely exemplary in nature, and are in no way intended to limit the application or uses of the invention.
[0114] The algorithm employed by the present invention is used to monitor the health status of the cable system in the cable structure in the case of generalized displacement of the support of the cable structure. During specific implementation, the following steps are one of various steps that may be taken.
[0115] Step 1: Determine the type, location and quantity of the quantity to be monitored, and number them. The specific process is:
[0116] Assuming that there are N cables, first determine the numbering...
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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...
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