6. Direct measurement
Direct measurement of modal parameters during vibration testing is not only of historical and educational interest, but also a reference method in terms of reliability of results.
6.1 Isolated mode
Let's first consider the case of an isolated mode in the spectrum. In the absence of coupling with neighboring modes, all ddl oscillate in phase or in phase opposition to each other under sinusoidal excitation in the vicinity of the natural frequency (see § 3.2.2
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Direct measurement
Local modal identification
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