Transient thermal state online evaluation method and device based on reduced-order model, and medium

A reduced-order model, thermal state technology, applied in computer-aided design, design optimization/simulation, CAD numerical modeling, etc., can solve the problem of rapid and accurate thermal state evaluation of industrial equipment, multi-computing resources and time consumption, multi-computing resources and other problems, to achieve the effect of shortening the design cycle, strong versatility, and improving the analysis method

Pending Publication Date: 2021-11-30
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the numerical integration phase tends to consume more computational resources than the numerical solution phase
On the one hand, multiple numerical integrations in the process of finite element thermal-mechanical coupling analysis are solved under the global discrete grid, and the large-scale discrete grid of more complex industrial equipment requires more computing resources
On the other hand, due to the nonlinear problem of materials, in the thermal-mechanical coupling analysis, the updated physical fi

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  • Transient thermal state online evaluation method and device based on reduced-order model, and medium
  • Transient thermal state online evaluation method and device based on reduced-order model, and medium
  • Transient thermal state online evaluation method and device based on reduced-order model, and medium

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[0093] specific embodiment

[0094] In this example, a typical gas turbine is used as the strength evaluation object, which involves complex thermal loading conditions during the operation of the gas turbine, and its structural strength evaluation is a typical transient nonlinear thermomechanical coupling problem. This embodiment specifically provides an online evaluation method for transient thermal state based on a finite element reduced-order model. The specific implementation of the method is mainly divided into two stages: offline data analysis and online thermal evaluation: the offline data analysis stage:

[0095] like figure 2 As shown, the actual gas turbine is physically modeled by CAD modeling software, and the numerical grid is discretized based on the finite element method, and the discrete degrees of freedom are usually tens of thousands or even hundreds of thousands.

[0096] Comprehensively consider the different working conditions in the operation of the gas...

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Abstract

The invention relates to a transient thermal state online evaluation method and device based on a reduced-order model, and a medium. The method is used for thermal coupling state evaluation of a complex structure in industrial equipment, and the evaluation method comprises the following steps: firstly, establishing a parameterized numerical model for operation parameters of the industrial equipment structure in an offline stage; then obtaining different types of data sets in the thermodynamic analysis process through parameterized numerical simulation, and carrying out feature analysis and extraction; and finally, establishing a complete reduced-order simulation model based on a finite element discrete model, and performing online correction and state evaluation of working condition parameters in combination with sensor measurement data in an online stage. Compared with the prior art, the invention has the advantages that various physical states of the transient nonlinear thermal coupling problem can be quickly and accurately obtained, and quick data analysis and theoretical support can be provided for state evaluation of an industrial equipment structure.

Description

technical field [0001] The invention relates to a transient thermal-mechanical coupled state evaluation method, in particular to an online evaluation method, equipment and medium for a transient thermal state based on a reduced-order model. Background technique [0002] During the operation of industrial equipment, the extreme thermal environment and high-intensity mechanical loads bring severe challenges to the structural strength assessment of the equipment structure. On the one hand, due to the large temperature gradient and uneven distribution of the temperature field in the structure due to the complex high-temperature thermal environment, its thermodynamic properties and material properties have changed significantly, such as its thermal conductivity (λ), specific heat capacity (c), Young's modulus (E), Poisson's ratio (μ) and thermal expansion coefficient (a) and other key thermal parameters have changed significantly, which introduces complex material nonlinear probl...

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F111/10G06F119/08G06F119/14
CPCG06F30/17G06F30/23G06F2111/10G06F2119/08G06F2119/14
Inventor 王炜哲江耿辉蔡振威
Owner SHANGHAI JIAO TONG UNIV
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