Parametric resonant motion advance warning method, apparatus and device for offshore floating structure

摘要

An offshore floating structure parametric resonance motion advance warning method, apparatus and device. The method acquires real-time collected motion signals in different degrees of freedom of the marine floating structure and linearly superimposes time history data of the different motion signals to obtain time history data of a combined signal. Generating instantaneous frequency time history data in which the instantaneous frequency of the combined signal changes with time based on the time history data of the combined signal; and identifying a sudden change in frequency from the instantaneous frequency time history data. And calculating a parametric resonance motion occurrence time by the sudden change of the frequency and issuing a pre-alarm, wherein the sudden change of the frequency is between motion signals in at least two degrees of freedom when the parametric resonance motion occurs. Due to the frequency doubling relationship. The present invention provides a parametric resonance motion pre-alarm with a more effective algorithm and less equipment cost, thereby efficiently performing parametric resonance motion with less energy consumption when the motion amplitude is relatively small in the early stage of parametric resonance occurrence. Can be avoided. [Selection diagram] Fig. 4