Time-domain simulations for four different type of curvature α: (a, b, c) α ₀ = 0 and α _m  = 0, (d, e, f) α ₀ = −0.25 and α _m  = 0.1, (g, h, i) α ₀ = 0 and α _m  = 0.3, (j, k, l) α ₀ = −01 and α _m  = −0.2; The α parameter versus time, the spectrogram of the acceleration of the point L and the zoom view of the spectrogram. The acceleration amplitude is normalized by the maximum amplitude calculated. The fundamental frequency is H ₁ = 186.3 Hz.