Time domain distribution random dynamic load identification method considering spatial correlation

Abstract

The invention discloses a time domain distribution random dynamic load identification method considering spatial correlation. The method comprises the steps: S1, establishing a finite element model of an actual thin-wall structure according to the geometrical shape of the actual thin-wall structure; S2, arranging measuring points on the actual thin-wall structure, and calculating a cross covariance function matrix of the response according to the dynamic response of the measurement; S3, according to the geometric position of an actual measuring point, determining a corresponding measuring point position on the thin-wall structure finite element model, calculating a Green function between a generalized orthogonal polynomial coefficient and a measuring point response, and assembling into an identification matrix; S4, performing K-L expansion on the responded cross covariance function matrix, and identifying the time domain distribution random dynamic load through a matrix inversion method according to the identification matrix. According to the method, the external non-stationary distributed random dynamic load is identified through the structural strain response, the time-varying distribution function of the distributed random dynamic load can be accurately obtained, and the indirect method for obtaining the external distributed random dynamic load of the engineering structure is provided.

Description

technical field [0001] The invention relates to the technical field of structural dynamics inverse problems, in particular to a time-domain distributed random dynamic load identification method considering spatial correlation. Background technique [0002] The external load information of the engineering structure is an important basis for structural dynamic analysis and state monitoring. In many cases, engineers can give the external load of the structure according to the existing standards, and carry out dynamic and reliability analysis. However, for the aerodynamic loads outside the wing structure, the impact of waves on the ocean platform, etc., due to the complex spatial distribution of such loads and the non-stationary randomness in the time domain, there is still a lack of effective measurement and calculation of such distributions. Random dynamic load technology. The time-domain distributed random dynamic load identification method proposed by the invention is based...

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Problems solved by technology

[0004] Purpose of the invention: In view of the difficulty in considering the spatial correlation of distributed random dynamic loads in the existing time-domain distributed random dynamic load identification methods, and the inability to identify non-stationary distributed random dynamic loads, the present invention proposes a time-domain distributed random dynamic load that considers spatial correlation recognition methods

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