(95)

The vibration modes corresponding to the first, second, and third electromechanical resonances are marked EM in Table 9.2.

The electromechanical resonance can be explained by analyzing the electromechanical response given by Eq. (26). This equation states that

$\stackrel{\u02c6}{u}(x)=\frac{{d}_{31}{\stackrel{\u02c6}{E}}_{3}}{\gamma}\frac{\mathrm{sin}\gamma x}{\mathrm{cos}\frac{1}{2}\gamma {l}_{a}}$ (96)

(96)

where the relation $a={l}_{a}/2$ was invoked. The poles of Eq. (96) correspond to frequency values where ...

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