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

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image (264)

Equation (264) has a nontrivial solution C10image only if

cosγl=0 (265)

image (265)

Substitution of Eq. (187) z=γlimage into Eq. (265) yields the eigenvalue equation

cosz=0 (266)

image (266)

which has the roots

z=π2,3π2,5π2,orzj=(2j1)π2,j=1,2,3, (267)

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