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Structural stochastic identification considering modeling uncertainty through sparse grid and similar system analysis

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Abstract

In this paper, a structural identification problem considering modeling uncertainty is investigated, which not only needs to identify the unknown parameters of mechanical structure, but also accurately quantifies the influence of stochastic modeling uncertainty on the unknown structural parameters. As a typical inverse problem, the solving of structural stochastic identification faces the double nesting of uncertainty propagation analysis and inverse calculations. In order to overcome this difficult, a novel uncertain inverse method based on sparse grid and similar system analysis is proposed. Firstly, this structural stochastic identification problem is decomposed into several deterministic inverse problems by sparse grid technique. Since the small variations of uncertain variables at any two adjacent sparse grid nodes, the corresponding two systems at sparse grid nodes are similar. Thus, by adequately utilizing this similarity, the similar system analysis strategy is innovatively developed, which reduces these time-consuming deterministic inverse problems into only one deterministic optimization inverse and a few forward problem calculations. Therefore, the inverse efficiency is significantly improved. Subsequently, the statistical moments and the probability density functions of the unknown structural parameters will be identified by utilizing the deterministic inverse results and their concentrated probabilities at the sparse grid nodes. Finally, the practicability of uncertain inverse method will be illustrated by four examples.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 51975199) and the Changsha Municipal Natural Science Foundation (Grant No. kq2014050).

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Correspondence to Jie Liu.

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Monash University Human Research Ethics Committee (MUHREC) Project Number 1509.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Byeng D. Youn.

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Cao, L., Liu, J., Hu, Y. et al. Structural stochastic identification considering modeling uncertainty through sparse grid and similar system analysis. Struct Multidisc Optim 65, 219 (2022). https://doi.org/10.1007/s00158-022-03316-8

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  • DOI: https://doi.org/10.1007/s00158-022-03316-8

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