Fig. 5.

In-plane and out-of-plane RMS amplitudes of the first six flexural modes as functions of the imposed torsional moment Û⁰ for periodic (left) and clamped (right) boundary conditions. For each type of boundary conditions, the out-of-plane, ${\mathrm{\alpha ̃}}_n^{\mathrm{R}\mathrm{M}\mathrm{S}}$, and the in-plane, ${\mathrm{\beta ̃}}_n^{\mathrm{R}\mathrm{M}\mathrm{S}}$, amplitudes are given respectively in the top and bottom plots. The styles and symbols on all plots are identical to those used in Fig. 3.