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Normal mode frequencies σ̂n for the clamped modes as functions of the imposed torsional moment Û0 for η = 0.1 (left) and as functions of the rotational inertia parameter η (right) for clamped boundary conditions at Û0 = 0. On both plots, the solid black lines represent the frequencies and the thick gray lines highlight the parts of the frequency branches corresponding to twisting modes.
