Method of simulating specific nonlinear wave sequence

Abstract

The invention discloses a method of simulating the specific nonlinear wave sequence. The method includes preprocessing of the ocean measured wave sequence, accurate solution of the nonlinear dispersion relation and automatic generation of wave machine driving signals. According to the method, the observed ocean wave sequence can be automatically processed, the wave sequence obtained through oceanobservation is converted into the frequency, the corresponding amplitude and the phase information required for laboratory simulation waves according to the Froude number similarity criterion throughutilizing Fourier transform; the third-order nonlinear irregular wave interaction theory is utilized to rapidly calculate the dispersion relation of complex multi-frequency waves through the iterativecalculation method, generally, wave number accuracy of wave components can be calculated to one thousandth within ten iteration steps, and problems of low precision and long time for directly solvingthe nonlinear dispersion relation are solved.

Description

technical field [0001] The invention belongs to the technical field of ocean engineering hydrodynamic experiment research, in particular to a method for simulating a specific nonlinear wave sequence in a laboratory. Background technique [0002] Wave is the most important dynamic load in ocean engineering. In the design of marine engineering structures, it is necessary to fully consider the effect of waves on offshore structures. In actual ocean engineering, the specific wave group sequence including extreme waves plays a decisive role in the damage of ocean structures. These waves have strong randomness and non-linear characteristics, and the probability of occurrence is low, but they are very destructive and difficult to predict. Therefore, accurately simulating these specific wave sequences in the laboratory is of great significance for studying the propagation characteristics of extreme wave group sequences and the interaction between extreme waves and structures. [...

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Problems solved by technology

However, the actual marine environment has strong nonlinear characteristics. Using traditional linear methods will cause deviations in wave sequences, making it difficult to accurately simulate specific nonlinear wave sequences.

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