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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, training sample combination explosion, and limited measured data, so as to achieve reduced quantity and high engineering The effect of application value and enhanced practicality

Active Publication Date: 2013-05-15
江苏中闽重工科技有限公司
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AI Technical Summary

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

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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Example Embodiment

[0037] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0038] The test model of a single-layer cylindrical reticulated shell is composed of 157 nodes and 414 rods. The test model is as follows: image 3 shown. Using the sinusoidal excitation method in the exciter excitation, the dynamic characteristics of the first 4 order frequencies and the first 2 order vibration shapes were tested. The following are the steps to correct 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 the finite element model according to the judgment criterion.

[0040] Table 1 Correlation analys...

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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 structure model correction method, in particular to a space grid structure model correction method. Background technique [0002] Spatial grid structure is a spatial structure system composed of rods and nodes according to certain rules, mainly including grid structure, reticulated shell structure, combined grid (shell) structure and prestressed grid (shell) structure. Most of them are public buildings or regional landmark buildings related to the national economy and people's livelihood, and their service life is often as long as decades or even hundreds of years. In the natural environment, they are inevitably coupled by factors such as environmental erosion, material aging, and uneven foundation settlement. In extreme cases, it will lead to catastrophic emergencies. Therefore, it is of great theoretical and practical significance to further strengthen and deepen the research on spatial structure monitoring technology and ...

Claims

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Application Information

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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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