Space grid structure model step-by-step correction method based on actual measurement mode

A space grid and structural model technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of reducing neural networks, limited measured data, and explosion of training sample combinations, so as to reduce the number and enhance practicality The effect of high performance and high engineering application value

Active Publication Date: 2015-06-17
江苏中闽重工科技有限公司
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Problems solved by technology

In the process of solid modeling of nodes, some parameters need to be set, and most of the parameters are a range, so only a more accurate result can be obtained
In addition, because the spatial grid structure has too many degrees of freedom and the available measured data is very limited, it is almost impossible to directly use the neural network to modify the model of the overall structure based on incomplete test information. The problem of sample combination explosion, so reducing the amount of calculation of the neural network has become the key to whether this method can be used

Method used

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  • Space grid structure model step-by-step correction method based on actual measurement mode
  • Space grid structure model step-by-step correction method based on actual measurement mode
  • Space grid structure model step-by-step correction method based on actual measurement mode

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0038] A single-layer cylindrical reticulated shell test model consists of 157 nodes and 414 rods. The test model is as follows image 3 shown. The dynamic characteristics of the first 4-order frequencies and the first 2-order mode shapes were tested by the sinusoidal excitation method in the exciter excitation. The following are the steps to modify the finite element model of the test reticulated shell:

[0039] (1) Use the finite element software ANSYS to establish the rigid model of the experimental reticulated shell, and then carry out the correlation analysis between the theoretical calculation and the measured results, as shown in Table 1, ER 1 =18.81%>5%, it is obvious that the rigid model needs to be corrected by finite element model according to the judgment criterion.

[0040] Table 1 Correlation analysis between measured...

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Abstract

The invention relates to a model correction method of a structure, in particular to a space grid structure step-by-step correction method. Firstly a semi-rigidity model of a space grid structure is built, then according to the result of node entity modeling, fiducial value of stiffness reduction factor of a node unit is determined, finally on the basis of mentioned procedures, the neural network technology and utilizing mode information of limited measure points are adopted to build the input factor CPFM of the neural network technology to correct the stiffness reduction factor of a bolt ball node unit step by step, and a finite element model closer to the an actual structure is obtained. The space grid structure model step-by-step correction method based on the actual measurement mode is suitable for correction of large-scaled structures like en electric power pylon, a steel truss and a steel frame structure, particularly suitable for the correction of a long-spanning space grid structure with a large number of nodes, simplifies the structure of the neural network technology, and improves nonlinear mapping capability and model correcting efficiency of the neural network technology, and has certain practical engineering value.

Description

technical field [0001] The invention relates to a model correction method of a structure, in particular to a model correction method of a space grid structure. Background technique [0002] Spatial grid structure is a spatial structure system composed of rods and nodes according to certain rules, mainly including grid structure, grid shell structure, combined grid (shell) structure and prestressed grid (shell) structure. Most of them are public buildings or regional landmark buildings that are related to the national economy and people's livelihood. The service life is often decades or even hundreds of years. In the natural environment, they are inevitably subjected to environmental erosion, material aging, uneven foundation settlement and other factors. In extreme cases, catastrophic emergencies can occur. Therefore, it has important theoretical and practical significance to further strengthen and deepen the research on spatial structure monitoring technology and its safet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 吴金志刘才玮张毅刚
Owner 江苏中闽重工科技有限公司
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