... and chaotic responses are observed for both monochromatic and bichromatic waves. In general, sub-harmonic and chaotic responses were obtained for bichromatic excitation to a greater extent than for monochromatic excitation. Transient chaotic motions have also been observed. Poincare maps of the response...

... hand, it has been also reported that low-frequency, subharmonic oscillations often occur in the motion of a structure with nonlinear moorings (e.g., Lean, 1971). mooring system monochromatic excitation phase portrait bifurcation diagram stiffness ratio upstream oil & gas nonlinearity...