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L-type wave-making machine wave-making signal generation method, device and L-type wave-making machine

A technology for signal generation and wave generator, applied in the field of physical simulation of waves in the laboratory, can solve problems such as the decrease of wave simulation accuracy, the complex and cumbersome calculation of hydrodynamic transfer function, etc., to improve calculation accuracy and efficiency, and increase stability. and effectiveness, the effect of simplifying the derivation calculation process

Active Publication Date: 2021-02-19
TIANJIN RES INST FOR WATER TRANSPORT ENG M O T
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a large area of ​​invalid wave area in the pool in the actual multi-directional 3D wave simulation process, such as image 3 As shown, it seriously affects the accuracy of the experimental results and restricts the application and development of the L-type wave maker.
[0006] Second, the generation technology of the wave-making signal of the wave-making machine is still based on the assumption of linear waves, and the traditional frequency-domain method based on the semi-infinite assumption is adopted. There are large errors in the calculation results of the wave-making signal, the process is extremely complicated, cumbersome and lengthy, and the signal Slow generation, slow data transmission, and easy to cause uncoordinated motion of the wave-making plate, etc.
During the calculation process, the target wave is defined as a linear wave, while important nonlinear factors are ignored, resulting in a decrease in wave simulation accuracy
The calculation of the required hydrodynamic transfer function is extremely complex, and the requirements for the plane layout of the wave-making boundary are very strict. Generally, it is only suitable for simple straight line layouts, but it is powerless for complex plane layouts.
This parameter is related to the frequency of the wave, so it can be classified as a linear frequency domain method. A large number of Hankel and Bessel functions are used in the calculation process. The derivation and calculation process is extremely complicated, cumbersome and lengthy, and it is easy to cause the movement of the wave-making plate. incongruity and other issues

Method used

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  • L-type wave-making machine wave-making signal generation method, device and L-type wave-making machine
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  • L-type wave-making machine wave-making signal generation method, device and L-type wave-making machine

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Embodiment 1

[0065] This embodiment provides a method for generating a wave-making signal, which is applied to an L-shaped wave-making machine. The L-shaped wave-making machine includes straight-line segmented wave-making units arranged along two adjacent sides of the water storage device (such as a square pool), and a circular arc transition segment connecting the two straight-line segmented wave-making units. wave unit. Both the segmented wave-making unit in the straight section and the segmented wave-making unit in the arc transition section are composed of a plurality of wave-making plates, and the adjacent wave-making plates are connected by moving shafts. The moving coupling shaft reciprocates along the normal direction of the wave-making plate connection under the action of the driving force. like Figure 4 As shown, the method includes the following steps:

[0066] Step S401, according to the on-site layout form of the L-type wave generator, establish the initial state coordinat...

Embodiment 2

[0073] In this embodiment, on the basis of the first embodiment above, the implementation process of the method for generating a wave-making signal is described in detail by taking the generation of a linear regular wave as an example. The method for generating a wave-making signal provided in this embodiment is also applicable to the L-shaped wave-making machine of the segmented wave-making unit in the straight line section and the segmented wave-making unit in the arc transition section. For the convenience of description, the two segmented wave-making units of the straight line are distinguished by the short-side segmental wave-making unit and the long-side segmental wave-making unit, where the short-side segmental wave-making unit is at the initial position, parallel to y axis; when the long-side segmented wave-making unit is at the initial position, it is parallel to the x-axis.

[0074] Figure 5 A flow chart of the method for generating a wave-making signal in this emb...

Embodiment 3

[0120] In this embodiment, on the basis of the first embodiment above, the implementation process of the method for generating a wave-making signal is described in detail by taking the generation of a linear irregular wave as an example. The method for generating a wave-making signal provided in this embodiment is applied to an L-shaped wave-making machine of a segmented wave-generating unit in a straight line segment and a segmented wave-generating unit in a circular arc transition segment. For the convenience of description, the two segmented wave-making units of the straight line are distinguished by the short-side segmental wave-making unit and the long-side segmental wave-making unit, where the short-side segmental wave-making unit is at the initial position, parallel to y axis; when the long-side segmented wave-making unit is at the initial position, it is parallel to the x-axis.

[0121] Image 6 A flow chart of the method for generating a wave-making signal in this em...

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Abstract

The invention provides a wave generating signal generating method and device, as well as the L-shaped wave generator, and belongs to the technical field of physical simulation of laboratory waves. Through the wave generating signal generating method and device, as well as the L-shaped wave generator, provided by the invention, by virtue of target wave information in a whole domain, a motional discrete equation of a motional coupling shaft is directly solved to obtain a calculated wave generating signal. Different from the conventional linear analytical solution method, the wave generating signal generating method is a numerical differentiation method in time domain, by which the nonlinearity of a wave is completely considered, a complex hydrodynamic transfer function in the frequency domain does not need to be solved, the simulation accuracy and the simulation efficiency are effectively improved, a phenomenon of inconsistency during motion of a wave generating plate is reduced, the procedure is greatly simplified, and the stability and the effectiveness of the physical simulation of the wave are enhanced. In the structure of the wave generator, junctions on the two sides are set ascircular arc transitional sections, so that the continuity and the uniformity of the space distribution of the wave are guaranteed, and formation of an invalid wave zone is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of physical simulation of laboratory waves, in particular to a method and device for generating a wave-making signal of an L-shaped wave-making machine and an L-shaped wave-making machine. Background technique [0002] In coastal, offshore or marine engineering, waves are a key hydrodynamic load. Simulating waves and studying their effects or damage mechanisms on structures can help people understand the threat of waves, so as to provide technical guidance for scientific research and engineering design. The physical simulation of ocean waves is an important method to study wave theory and an important means to solve various wave-related problems. The use of wave generators to generate physical waves in the laboratory is an important experimental method for studying wave propagation, breaking characteristics and their interaction with sea-related structures. The accuracy of the ocean waves simulated in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B1/02G01M10/00
CPCE02B1/02G01M10/00
Inventor 阳志文张华庆解鸣晓李鑫肖辉王海申吴明阳
Owner TIANJIN RES INST FOR WATER TRANSPORT ENG M O T