Method for generating extreme waves at specified positions in experimental water tank

Abstract

The invention relates to a method for generating extreme waves at specified positions in an experimental water tank and belongs to the technical field of ocean engineering and hydrodynamic experimental research. The method comprises steps of: determining a wave parameter according to a water tank parameter in a laboratory, generating a wave-generating signal, inputting the wave-generating signal into a wave-generating system for initial wave making, determining whether the waves are broken, and changing the wave amplitude and the spectrum width constituting the waves if so in order to re-determine the wave parameter; if not, calculating the phase deviation at a focus position by using all-phase Fourier transform, correcting the wave-generating signal by using a phase difference, generating waves by a wave generator, determining whether the phase adjustment at the focus position converges, and recalculating the phase deviation at the focus position if not; if so, generating the extreme waves at the specified positions. The method flexibly controls the effect position of the extreme waves and a structure model in the water tank and precisely generates extreme waves in different forms at designated positions of the water tank, thereby improving experimental efficiency and precision.

Description

technical field [0001] The invention belongs to the technical field of marine engineering and hydrodynamic experiment research, and relates to a method for generating extreme waves at a designated position in an experimental water tank Background technique [0002] Extreme waves are single abnormally large waves that suddenly appear on the sea surface, which have brought serious harm to human life and production activities. In order to avoid the damage of extreme waves to offshore structures, we can simulate extreme waves in the experimental tank to provide a basis for the design of marine engineering structures. When simulating the effect of extreme waves on structures in a tank, the structural model is often bulky, expensive, and inconvenient to move. Therefore, there is now a need for a method that can precisely control the focus position of the wave, and generate extreme waves of different shapes at the specified position, so as to accurately simulate the impact of extr...

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Problems solved by technology

In addition, in the existing methods of generating extreme waves, it is impossible to judge the wave surface conditions upstream and downstream of the focus point, and there may be early and secondary breakage during the propagation process, resulting in the location and preset of extreme waves. There is a large deviation in the position, and the model structure needs to be moved repeatedly, resulting in a waste of cost

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