Mathematical Problems in Engineering / 2019 / Article / Tab 8

Research Article

Model Updating of a Stitched Sandwich Panel Based on Multistage Parameter Selection

Table 8

Comparison of modal frequencies between test and numerical models of cases 1 and 2.

Mode orderTest (Hz)Numerical mode
Initial (Hz)Error (%)Case 1Case 2
Updated (Hz)Error (%)Updated (Hz)Error (%)

1189.90213.3212.33187.29−1.37189.16−0.39
2204.59125.37−38.72201.34−1.59201.17−1.67
3387.64415.257.12380.19−1.92378.37−2.39
4439.56324.71−26.13441.700.49447.811.88
5583.81610.974.65587.730.67584.300.08
6672.74561.10−16.59655.02−2.63670.85−0.28
7751.18768.722.33767.952.23763.801.68
8790.16817.673.48803.541.69805.001.88
9878.64875.59−0.35912.013.80893.221.66
10916.01994.608.58937.482.34961.014.91
Mean error12.031.871.68

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