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Structural Health Monitoring with Piezoelectric Wafer Active Sensors, 2nd Edition by Victor Giurgiutiu

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image (42)

The DWT coefficient cm,nimage is given by

cm,n=+x(t)Ψ*m,n(t)dt (43)

image (43)

Here wavelets are orthonormal functions obtained by shifting and dilating a mother wavelet ψ(t)image

Ψm,n(t)=2m/2Ψ(2mtn) (44)

image (44)

As m increases, the wavelets stretch ...

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