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Parameter classification-step model correction method based on sensitivity analysis

A technique of sensitivity analysis and parameter classification, which is applied in the field of model correction, can solve problems such as parameter deviation from the true value, great sensitivity difference, and difficulty in determining parameter values, and achieve good correction effects, obvious effects, and improved accuracy

Inactive Publication Date: 2019-04-19
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] For the single-step correction method based on static dynamics, due to the great difference in the sensitivity of different responses to the parameters to be corrected, it is difficult to determine the value of the parameters during the correction process of the program, which eventually causes some parameters to seriously deviate from the true value

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  • Parameter classification-step model correction method based on sensitivity analysis
  • Parameter classification-step model correction method based on sensitivity analysis
  • Parameter classification-step model correction method based on sensitivity analysis

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Embodiment 1

[0049] The parameter classification-step-by-step model correction method based on sensitivity analysis in the present invention cannot avoid the disadvantage that the response with a large residual error dominates the correction direction, while the response with a small residual error plays a weakened role in the correction. When there are many parameters to be corrected, the calculation is not stable. In order to solve the above problems, the present invention proposes a strategy of classifying the corrected parameters based on sensitivity analysis, and then correcting them step by step. This strategy is corrected according to the next step and the previous step. After the parameter is the initial value, and keep the modified parameter unchanged, the principle of modifying other parameters. Therefore, this method is stable in calculation and has high precision.

[0050] The present invention comprises the steps:

[0051] S1: The three-dimensional space model is established ...

Embodiment 2

[0071] Below in conjunction with embodiment 2, the present invention is described in further detail.

[0072] The parameter classification-step-by-step model correction method based on sensitivity analysis of the present invention comprises the following steps:

[0073] S1: Establishment of simply supported beam finite element model: use the separate modeling method to establish a three-dimensional space model;

[0074] S2: Selection of correction parameters, parameter values ​​of the "test" model, as shown in the table below:

[0075] Table 2 "Test" model parameter values

[0076]

[0077] Then compare the results before and after correction:

[0078] Table 3 Comparison of modal change results before and after correction (unit: Hz)

[0079]

[0080] Table 4 Comparison of displacement changes before and after correction (unit: mm)

[0081]

[0082]

[0083] Table 5 Comparison of model parameter values ​​before and after correction

[0084]

[0085] S3: Para...

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Abstract

The invention relates to a Parameter classification-step model correction method based on sensitivity analysis. The invention discloses a step-by-step model correction method, belongs to the technicalfield of model correction, and solves the problem of model correction of a reinforced concrete T-shaped section simply supported beam comprehensively considering static and dynamic responses. The method comprises the following steps: S1, establishing a simply supported beam finite element model: establishing a three-dimensional space model by using a separated modeling method; S2, selecting correction parameters, including the following steps: S21, parameter primary selection; and S22, sensitivity analysis. S3, parameter classification based on sensitivity analysis. The step-by-step correction strategy comprises the following small steps: S31, global correction; and S32, local correction. According to the method, mutual restriction and mutual influence of different response residual termsin the correction process are reduced to a great extent, the corrected model can accurately reflect the static and dynamic response of the real structure, and the corrected physical parameters and boundary conditions are basically consistent with the real structure.

Description

technical field [0001] The invention relates to a parameter classification-step-by-step model correction method based on sensitivity analysis, and belongs to the technical field of model correction. Background technique [0002] For the finite element model correction based on vibration test, the traditional correction method has a single correction parameter and is suitable for special situations. The test modal information is greatly disturbed by noise, it is impossible to obtain a complete test mode, and it is difficult to measure the mass and damping, resulting in vibration Type regularization difficulties, etc., and the errors caused by these problems may be larger than the inaccuracy of the theoretical model. [0003] For the finite element model correction based on static test, most of the traditional research methods focus on the parameter identification of the model, and the research on the finite element model is insufficient. [0004] There are many traditional m...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 刘才玮赵元元苗吉军相超
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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