Issue 58

J. Wang et alii, Frattura ed Integrità Strutturale, 58 (2021) 114-127; DOI: 10.3221/IGF-ESIS.59.09

the optimization without metamodel is applied to the FEM directly (the parameters are in the expanded design domain), and the updated result is listed in the penultimate column of Table 3, the error is almost at the same level as the proposed method. This can lead to the conclusion that the Kriging model shows advantages in the specific dynamic model updating.

Figure 10: The Kriging model in (E, ρ ) dimension

Figure 11: The error at checking points.

±10% variation

±20% variation

RSM

Directly

Experime nt (Hz)

Orde r

After updated (Hz)

After updated(Hz )

After updated(Hz )

After updated(H z)

Erro r (%) 0.61 -2.69 0.01 -0.26 2.73

Error (%) 1.58 -3.18 0.23 -0.63 2.39

Error (%)

Error (%) 2.35 -1.00 1.75 1.47 4.52

1 2 3 4 5

226.8 275.2 537.4 861.5 974.8

230.39 266.46 538.66 856.08 998.06

229.57 268.50 539.80 861.81 1004.48

1.22

232.14

228.18 267.79 537.46 859.26 1001.43

-2.43 272.44

0.45

546.80

0.036 874.20

3.04

1018.85

Table 3. Comparison before and after model updating

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