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Material Design & Processing Communications
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2023
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Article
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Tab 8
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Research Article
Experimental Investigations of Damage Identification for Aluminum Foam Sandwich Beams Using Two-Step Method
Table 8
Natural frequencies under different levels of noise interference (Hz).
Case
Modal order
1
2
3
1.5 times the noise
54.47
377.79
929.93
4 times the noise
55.41
376.95
929.10
9 times the noise
54.38
377.60
929.33