Residual force vector damage identification method based on probability uncertainty

Abstract

The invention provides a residual force vector damage identification method based on probability uncertainty. The residual force vector damage identification method comprises the steps of measuring modal information of a local measurement point of a to-be-identified structure; constructing a function equation between the modal information and the structural damage parameters of the to-be-identified structure; obtaining probability distribution of modal information by using a probability uncertainty quantification technology; obtaining a probability distribution solving formula of the structural damage parameters according to the probability distribution of the modal information and the function equation; obtaining damage parameter probability distribution of a damaged structure and an undamaged structure in the to-be-identified structure according to a probability distribution solving formula of the structure damage parameters; and obtaining a damage expectation index of the to-be-identified structure according to the damage parameter probability distribution of the damaged structure and the undamaged structure. According to the method, the damage expectation index representing thestructural damage can be obtained through the modal information of the local measurement points of the structure, good adaptability is achieved, richness of structural damage description can be guaranteed, and meanwhile definite physical significance is achieved.

Description

technical field [0001] The invention relates to the technical field of structural damage identification, in particular to a residual force vector damage identification method based on probability uncertainty. Background technique [0002] At present, in the identification of structural damage, the identification method usually adopted is the identification method based on the residual force vector. Mainly because the residual force vector method requires only simple mathematical operations and is computationally small. [0003] However, in practical applications, there are still two problems in the commonly used residual force vector method. First, the residual force vector method is difficult to effectively eliminate measurement errors, but there are often errors in the measurement of structural modal information, which will cause inaccurate identification results of structural damage parameters; second, the current residual force The vector method only quantifies the unc...

AI Technical Summary

Problems solved by technology

First, the residual force vector method is difficult to effectively eliminate measurement errors, but there are often errors in the measurement of structural modal information, which will cause inaccurate identification results of structural damage parameters; second, the current residual force The vector method only quantifies the uncertainty of the structure itself, but does not quantify the uncertainty of the measurement information when identifying structural damage.

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