Finite Element Model Fractional Steps Updating Strategy for Spatial Lattice Structures Based on Generalized Regression Neural Network
Table 4
Results of model updating.
Modal
(measured, Hz)
(updated, Hz)
Correlation analysis
Modal shapes
(%)
MAC
1
6.62
6.65
0.45
0.96
Type I, the whole structure displays translational motion in the transverse direction.
2
8.40
7.96
5.23
0.91
Type II, the both ends of the structure display nonsymmetric motion in the longitudinal direction.
3
10.10
10.82
7.13
0.85
Type III, the middle of the structure displays offset to one side. The both ends of the structure display symmetric motion in the longitudinal direction.
