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A fast inversion method of dam structural performance parameters based on pce_bo

A technology of structural performance and parameters, applied in CAD numerical modeling, geometric CAD, probabilistic CAD, etc., can solve the problems of low calculation efficiency and small application range, and achieve the effect of improving calculation efficiency

Active Publication Date: 2022-07-19
HOHAI UNIV
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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a PCE_BO-based fast inversion method of dam structural performance parameters. Compared with existing methods, this method can overcome the shortcomings of traditional algorithms such as small application range and low calculation efficiency, and has excellent Robustness of

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  • A fast inversion method of dam structural performance parameters based on pce_bo
  • A fast inversion method of dam structural performance parameters based on pce_bo
  • A fast inversion method of dam structural performance parameters based on pce_bo

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Embodiment 1

[0084] This example is implemented based on the National Key Research and Development Program (2018YFC0406703) and the National Key Fund Project (51739006); this example selects a finite element model of an arch dam such as figure 2 shown, image 3 The elevation view of the deformation monitoring arrangement of the arch dam is shown, and the positions of each measuring point are indicated by the numbers in the figure. Among them, vertical monitoring is arranged at measuring points 1 and 2, and vertical monitoring is arranged at measuring point 3. Table 1 provides the prior distribution and statistical values ​​of the random variables for probabilistic inversion required to construct the PCE surrogate model, indicating that there are 9 performance parameters to be inverted in this embodiment, and the empirical value of each parameter is the initial value of the inversion variable.

[0085] Table 1 Probabilistic inversion of random variables prior distribution and statistical ...

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Abstract

The present invention provides a PCE_BO-based fast inversion method for structural performance parameters, comprising the following steps: Step 1: establish a high-fidelity numerical model that can characterize the characteristics of the physical model of the structure; Step 2: select the structural performance parameters to be inverted as input Variables, randomly sample a finite set of input variables through the Latin hypercube method, and substitute them into the structural numerical model to solve the corresponding output variable set, and construct a polynomial chaotic expansion surrogate model that can characterize the structural characteristics; Step 3: By incorporating the corresponding engineering requirements parameters The measured data is used as the input set in the Bayesian optimizer, and then based on the polynomial chaos expansion surrogate model combined with the Bayesian optimization algorithm to quickly update the structural performance parameters to be inverted. The invention makes up for the deficiencies of traditional deterministic inverse analysis, liberates the inversion efficiency in the field of classical inversion analysis from the limitation of computational cost of complex numerical models, improves inversion efficiency and robustness to noise, and realizes fast inversion of structural performance parameters. The goal.

Description

technical field [0001] The invention belongs to the field of structural engineering, and relates to a PCE_BO-based fast inversion method for dam structural performance parameters. Background technique [0002] As the main structure of the water conservancy and hydropower junction, the safety of the dam is an important issue that people are very concerned about. In the field of dam safety monitoring and health diagnosis, determining the physical parameters of dam concrete and bedrock materials during construction and operation is crucial to predicting the safety of the structure. A large part of the current back-analysis research on dam engineering parameters is based on deterministic analysis or limited probability analysis with engineering judgment. The equation of state is solved by performing a large number of finite element analysis on the corresponding numerical model. However, due to the special characteristics of the dam Geometric shape and complex coupling with diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/27G06F30/13G06F111/06G06F111/08G06F111/10G06F119/14
CPCG06F30/23G06F30/27G06F30/13G06F2111/06G06F2111/10G06F2111/08G06F2119/14
Inventor 曹茂森任青文李翼飞王启明
Owner HOHAI UNIV
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