Research on Damage Detection Method for Substation Gantry Structures Based on Natural Frequencies and Mode Shapes
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Abstract
Gantry Structures are very important devices whose' safety is closely related to substation. A theoretical model for detecting gantry structures' damage based on natural frequencies and mode shapes has been proposed in the present paper. In order to improve sensitivity, partial frequencies and mode shapes have been chosen to detect damage, also a measurement point selection algorithm is developed by using the prior information of sensors to solve ill-posed problem in damage identification. The optimal measurement selection algorithm, parameter identification algorithm and error updating algorithm are alternately conducted to estimate the uncertainty of the prior information of sensors, which are used to improve to the precision of identification result.
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