Mathematical Problems in Engineering / 2019 / Article / Tab 6

Research Article

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

Table 6

Comparison of updated modal frequencies between experiment and analysis with different weighting matrices.

Mode orderExperiment (Hz)Case I: WCase II:
Numerical (Hz)Error (%)Numerical (Hz)Error (%)

1189.90190.660.40190.780.46
2204.59201.94−1.29199.57−2.46
3387.64383.47−1.08384.03−0.93
4439.56450.752.55449.972.37
5583.81593.421.65595.612.02
6672.74664.87−1.17661.87−1.62
7751.18769.542.44770.282.54
8790.16817.253.43822.754.12
9878.64909.263.48913.503.97
10916.01970.105.91979.156.89
Mean error2.342.74

Mean error means absolute average error, mean error = .

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