Method applicable to identifying damage to space grid structure
A technology for spatial grid and structural damage, applied in character and pattern recognition, biological neural network models, instruments, etc. The value of engineering application and the effect of enhancing practicability
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Embodiment 1
[0037] A single-layer Kewitt reticulated shell structure is supported by three-way hinges around it, and all the rods are made of round steel pipes. The numerical model is as follows figure 2 , 3 shown. The damage of the rods in the structure is simulated by stiffness reduction, and its mass is assumed to be constant. The model modeling and modal calculations are all done by numerical simulation, that is, the finite element software ANSYS is used to complete. The following are the steps of member damage identification:
[0038] (1) Division and numbering of substructures. Notice that it is composed of 6 sectors, each sector not only has the same number and type of rods, but also has the same force characteristics, so the model can be regarded as composed of 6 substructures, numbered: 1, 2, 3, 4 , 5, 6. like figure 2 shown. Since each substructure is completely symmetrical, the first substructure is chosen as an example for discussion, such as Figure 4 As shown, the d...
Embodiment 2
[0053] The experimental model of a single-layer cylindrical reticulated shell consists of 157 nodes and 414 rods, such as Figure 5 shown. The dynamic characteristics of the first three modes were tested by sinusoidal excitation method. Taking the second substructure as an example, the structural damage is simulated by removing the rods. The test damage samples are as follows: Image 6 (black bold rod) and Table 4.
[0054] Table 4 Summary of damage samples
[0055]
[0056] (1) Division and numbering of substructures. It is noted that the model has 7 column distances in the longitudinal direction, and the number and type of members of the structure between each column distance are similar, so the test model can be regarded as composed of 7 substructures, numbered: 1, 2, 3, 4 , 5, 6, 7.
[0057] (2) Using the comprehensive ranking method of measuring point layout priority to optimize the layout of the measuring points of the reticulated shell structure, Figure 5 The ...
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