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International Journal of Geophysics
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International Journal of Geophysics
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2011
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Article
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Tab 2
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Research Article
Noninvasive Remote Sensing Techniques for Infrastructures Diagnostics
Table 2
Significant oscillation frequencies of the beam under the four direct impacts.
Drop
First frequency (Hz)
Secondary frequency (Hz)
1
4.7
9.3
2
4.5
13.7
3
4.5
13.2
4
4.6
8.4