Method of simulating specific nonlinear wave sequence

A nonlinear and wave technology, applied in the field of marine engineering hydrodynamics experiment research, can solve the problems such as difficult to accurately simulate nonlinear wave sequence, wave sequence deviation, etc.

Inactive Publication Date: 2018-11-02
DALIAN UNIV OF TECH
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Problems solved by technology

However, the actual marine environment has strong nonlinear characteristics. Using traditional linear methods w...

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  • Method of simulating specific nonlinear wave sequence
  • Method of simulating specific nonlinear wave sequence
  • Method of simulating specific nonlinear wave sequence

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Embodiment Construction

[0068] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples of implementation. It should be understood that the specific implementation examples described here are only used to explain the present invention, and are not intended to limit the present invention:

[0069] The example experiment was carried out in the unidirectional wave tank of the State Key Laboratory of Coastal and Offshore Engineering of Dalian University of Technology. The wave-making system in the laboratory consists of three parts: control system, power system and acquisition system. The control system can read the wave-making signal, and convert the wave-making digital signal into an electrical signal for driving the servo motor; the power system is used to drive the servo motor, drive the wave-making plate to move, generate disturbance in...

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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. [...

Claims

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Application Information

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IPC IPC(8): G01M10/00
Inventor 马玉祥牛旭阳董国海马小舟台兵
Owner DALIAN UNIV OF TECH
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