The radiation potentials will be derived first. In order to account for theelastic deformation of the plate, the mode-expansion method is employed(see Newman 1994). As expressed by Eq. (3.3), the deflection of the platew(x) is represented by a superposition of arbitrarily chosen modal functionsflS(x) (l = 1, . . . , NS) and flA(x) (l = 1, . . . , NA) including both rigid bodymotions and elastic deformations with modal amplitudes ζlS and ζlA, respectively. Here, the suffixes S and A indicate the symmetry and anti-symmetry of the solution with respect to the yz-plane, respectively. The total radiation potential φR(x, z) is then decomposed using the same modal amplitudes ζlS and ζlA and the corresponding unit-amplitude radiation potentials φlS(x, z)and φlA(x, z) are given by
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