An Experimental Test Bed for Developing High-Rate Structural Health Monitoring Methods

Figure 6

Results from the moving roller experiment. (a) Diagram of the beam with moving rollers. (b) Amplitude of the discrete Fourier series (DFS) of the tip acceleration. (c) Time history of the tip acceleration. (d) Spectrogram of the tip acceleration while the rollers move. The dashed line shows the natural frequency estimated from the cart position obtained from the encoder on the linear actuator.

(a)

(b)

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(d)