Characterization of a rectangular single-cell cross-section

The cross-sectional dimensions of such a box beam are given by the height a and width b. Thus, the piecewise parameter representation of the wall curve assumes the following form  

To achieve actuation or sensing according to schemes I or II of Table 10.2, the relative sign of electric field strength and polarization needs to be constant all over the cross-section  

To utilize the warping effect, as illustrated by scheme III of Table 10.2, the relative sign has to alternate from quadrant to quadrant of the box beam  

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Fig. 10.3. Characterization of a rectangular single-cell cross-section.

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