Wave making control method and device for wave making machine arranged at both ends of wave test pool

Abstract

This invention discloses a wave generation control method and apparatus for wave generators deployed at both ends in a wave testing tank. First, the target positions and target angular frequencies of two wave trains are determined based on the target function, which can be wave attenuation, bidirectional wave generation, or focused wave generation. Then, the propagation times of the two wave trains are calculated respectively. Based on the propagation times, the target activation time of the corresponding wave generator is determined. Finally, the corresponding wave generator is activated at the target activation time, generating the corresponding waves based on the target wave height and target angular frequency. In this invention, each end of the wave generators deployed at both ends can independently control wave generation at each end. Based on the synergistic effect of the wave generators deployed at both ends, wave propagation and superposition are controlled, accurately generating focused waves and simulating the effect of concentrated waves on marine structures.

Description

Technical Field

[0001] This invention relates to the field of simulated wave generation technology, and more specifically, to a wave generation control method and apparatus for wave generators arranged at both ends in a wave test pool. Background Technology

[0002] In the field of marine engineering, wave test tanks are widely used in various experiments to simulate the effects of ocean waves on structures, especially in the design, testing, and safety assessment of offshore platforms, ships, and other marine structures. Waves in the tank are generated by wave generators to simulate natural ocean wave motion, helping engineers evaluate the response of structures under wave action.

[0003] Currently, conventional wave test tanks typically consist of a wave generator installed on one side of the test area, and a wave-damping plate or wall on the other. The wave generator is generally a push-plate or rocker-plate type, driving the wave-generating plate to produce waves. Different ocean waves can be simulated by adjusting the amplitude and frequency of the wave generator's movement. The wave-damping plate is designed to absorb or convert the wave energy after it propagates to the end of the tank, reducing the generation of reflected waves and minimizing the impact of wave reflections on experimental results. However, wave test tanks can only generate waves in a single direction and cannot generate focused waves, thus failing to simulate the impact of concentrated waves on marine structures. Summary of the Invention

[0004] In view of this, the present invention provides a wave generation control method and device for wave generators arranged at both ends in a wave test pool, which solves the problem that existing wave generation methods in wave test pools cannot generate focused waves and cannot simulate the impact of concentrated waves on marine structures.

[0005] To achieve the above objectives, the following solution is proposed:

[0006] A wave generation control method for wave generators positioned at both ends in a wave test tank includes:

[0007] The target position and target angular frequency of the two waves are determined based on the target function, wherein the target function is wave elimination, generating bidirectional waves, or generating focused waves.

[0008] Calculate the propagation time of the two waves respectively;

[0009] Determine the target start time of the corresponding wave generator based on the propagation time;

[0010] The corresponding wave generator is activated at the moment the target is activated, and waves are generated based on the target wave height and the target angular frequency.

[0011] Preferably, the process of determining the target positions of the two waves based on the target function includes:

[0012] If the target function is to generate a focused wave, then the target position of the two waves is the focusing position;

[0013] If the target function is wave suppression, then the target position of the first wave train is the position of the second wave generator;

[0014] If the target function is to generate bidirectional waves, then the target positions of the two waves are the simulated locations of ocean structures.

[0015] Preferably, if the target function is to generate a focused wave, the calculation conditions for the target angular frequency include:

[0016] At the target time, the phases of the two waves at the target location should satisfy:

[0017] ω1(t0-t1)-k1x0=ω2(t0-t2)-k2(L-x0)+2nπ;

[0018] Where ω1 is the angular frequency of the first wave generator, t0 is the focusing time of the two waves, t1 is the propagation time of the first wave, k1 is the wave number of the first wave generator, ω2 is the angular frequency of the second wave generator, L is the distance between the two wave generators, x0 is the target position, t2 is the propagation time of the second wave, k2 is the wave number of the second wave generator, and n is the number of cycles.

[0019] When the wave periods of the two waves are different, the instantaneous focusing condition is:

[0020]

[0021] Preferably, if the target function is wave attenuation, the calculation conditions for the target angular frequency include:

[0022]

[0023] The wave surface equation η1 of the first wave generator when the first wave reaches the second wave generator:

[0024]

[0025] Where ω is the angular frequency of the two wave generators, t is the time step, L is the distance between the two wave generators, and H is the wave height;

[0026] The wave surface equation η2 for the second wave generator is:

[0027]

[0028] Where x is the distance between the second wave train and the second wave generator, and Δt is the propagation time.

[0029] Preferably, if the target function is to generate a two-way wave, the calculation conditions for the target angular frequency include:

[0030] The wave surface equation of the first wave generator is:

[0031]

[0032] Where ω1 is the angular frequency of the first wave generator, t is time, H1 is the wave height of the first wave train, x1 is the wave at a distance of x1 meters from the first wave generator, and k1 is the wave number of the first wave generator.

[0033] The wave surface equation of the second wave generator is:

[0034]

[0035] Where ω2 is the angular frequency of the second wave generator, t is time, H2 is the wave height of the second wave train, x2 is the wave at a distance of x2 meters from the second wave generator, and k2 is the wave number of the second wave generator.

[0036] A wave generation control device for wave generators arranged at both ends in a wave test tank includes:

[0037] The parameter determination unit is used to determine the target position and target angular frequency of the two waves based on the target function, wherein the target function is wave elimination, generating bidirectional waves, or generating focused waves.

[0038] The propagation time calculation unit calculates the propagation time of the two waves respectively;

[0039] The start-up time calculation unit determines the target start-up time of the corresponding wave generator based on the propagation time.

[0040] The control unit activates the corresponding wave generator at the moment the target is activated, generating waves based on the target wave height and the target angular frequency.

[0041] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0042] This invention provides a wave generation control method for wave generators deployed at both ends in a wave testing tank. The method determines the target position and target angular frequency of two wave trains based on a target function. The target function is wave attenuation, bidirectional wave generation, or focused wave generation. The propagation time of each wave train is calculated. The target activation time of the corresponding wave generator is determined based on the propagation time. The corresponding wave generator is activated at the target activation time, generating corresponding waves based on the target wave height and target angular frequency. In this invention, each end of the wave generators deployed at both ends can independently control wave generation at each end. Based on the synergistic effect of the wave generators deployed at both ends, wave propagation and superposition are controlled, accurately generating focused waves and simulating the effect of concentrated waves on marine structures.

[0043] This invention utilizes wave propagation time calculations to eliminate wave reflections generated on the other side by reverse adjustment of waves generated by one wave generator, achieving a highly efficient wave-damping effect and reducing the impact of wave reflections within the pool on experimental results. By precisely controlling the activation and wave adjustment of the wave generators at both ends, forward and reverse waves can be generated simultaneously in the same experiment, realistically simulating the reciprocating wave action on marine structures. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0045] Figure 1 A flowchart of a wave generation control method for wave generators arranged at both ends in a wave test tank, provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the wave-damping process provided in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the bidirectional wave generation process provided in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the focused wave generation process provided in an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of a wave generation control device with wave generators arranged at both ends in a wave test pool, as provided in an embodiment of the present invention. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] First, combined Figure 1 This invention provides a wave generation control method for wave generators arranged at both ends in a wave test tank, as described in an embodiment of the invention. Figure 1 As shown, the control methods include:

[0052] Step S01: Determine the target position and target angular frequency of the two waves based on the target function.

[0053] Specifically, wave generators positioned at both ends can achieve functions such as wave suppression, generating bidirectional waves, or generating focused waves. If the target function is focused waves, the target positions of the two wave trains are the focusing positions; if the target function is wave suppression, the target position of the first wave train is the position of the second wave generator; if the target function is bidirectional waves, the target positions of the two wave trains are the simulated positions of the ocean structures.

[0054] Step S02: Calculate the propagation time of the two waves respectively.

[0055] Specifically, the propagation time of the two waves can be calculated based on the distance between the target location and the wave generator, as well as the wave speed.

[0056] Step S03: Determine the target start time of the corresponding wave generator based on the propagation time.

[0057] Specifically, the start time of the wave generator can be calculated based on the current time, the propagation time, and the preset time to reach the target location.

[0058] Step S04: Activate the corresponding wave generator at the target activation time.

[0059] Specifically, waves are generated based on the target wave height and the target angular frequency. Two waves converge at the target location.

[0060] This invention provides a wave generation control method for wave generators deployed at both ends in a wave testing tank. The method determines the target positions and target angular frequencies of two wave trains based on a target function. The target function is wave attenuation, bidirectional wave generation, or focused wave generation. The propagation times of the two wave trains are calculated. The target activation time of the corresponding wave generator is determined based on the propagation time. The corresponding wave generator is activated at the target activation time, generating corresponding waves based on the target wave height and target angular frequency. In this invention, each end of the wave generator deployed at both ends can independently control wave generation at each end. Based on the synergistic effect of the wave generators deployed at both ends, wave propagation and superposition are controlled, accurately generating focused waves and simulating the effect of concentrated waves on marine structures.

[0061] This invention utilizes wave propagation time calculations to eliminate wave reflections generated on the other side by reverse adjustment of waves generated by one wave generator, achieving a highly efficient wave-damping effect and reducing the impact of wave reflections within the pool on experimental results. By precisely controlling the activation and wave adjustment of the wave generators at both ends, forward and reverse waves can be generated simultaneously in the same experiment, realistically simulating the reciprocating wave action on marine structures.

[0062] Next, the implementation process of the three functions will be described in the embodiments of the present invention. First, the parameters in the wave generation process will be introduced:

[0063] The dispersion equation is: ω 2 =gk0 tanhk0h.

[0064] Where ω is the angular frequency, g is the gravitational acceleration, h is the water depth, and k0 is the wave number.

[0065] The equation of a regular wave surface is:

[0066]

[0067] Where H is the wave height, t is the time step, and x is the distance from the wave generator.

[0068] The target wave height H is:

[0069]

[0070] Among them, X a d represents the amplitude of the push plate vibration, and d represents the immersion depth.

[0071] The transfer function of a regular wave is:

[0072]

[0073] Where S is the stroke of the pusher-type wave generator, that is, the maximum push stroke of the wave generator.

[0074] I. Wave Attenuation Process

[0075] like Figure 2 As shown, the distance between the two wave generators in the wave test pool 1 is L. The first wave generator 2 generates a first wave by generating waves in the forward direction. Wave generation is performed by specifying the target wave height H, wave period T, and wave generation duration t (time step). The time it takes for the generated wave to reach the second wave generator 3 can be calculated by calculating the wave velocity. Then, the second wave generator 3 is used to generate waves in the reverse direction to suppress the waves.

[0076] The calculation process is as follows:

[0077] The wave surface equation of the first wave generator 2 is:

[0078] Where ω is the angular frequency of the two wave generators, t is time, x is the distance of the first wave train from the wave generator, H is the wave height, and k0 is the wave number.

[0079] The wave surface equation of the first wave generated by the first wave generator 2 when it reaches the second wave generator 2 is:

[0080]

[0081] Where L is the length of the wave test pool.

[0082] The transmission time is:

[0083] Where c is the wave speed.

[0084] The wave surface equation of the second wave generator 3 is:

[0085]

[0086] Where x is the distance between the second wave train and the second wave generator, Δt is the propagation time, k0 is the wave number, and t≥Δt.

[0087] When x = 0, the wave surface equation of the second wave generator 3 is:

[0088]

[0089] Establish the wave suppression relationship between the first wave generator 2 and the second wave generator 3:

[0090]

[0091] II. The process of generating bidirectional waves

[0092] like Figure 3 As shown, when both wave generators are in motion, both forward and reverse waves can be generated simultaneously. The wave height and period settings of the two wave generators can be the same or different, depending on the simulation requirements, thus simulating the reciprocating wave action on marine structures. In this case, the wave surface equations of the two wave generators are:

[0093] The wave surface equation of the first wave generator 2 is:

[0094]

[0095] Where ω1 is the angular frequency of the first wave generator, t is time, H1 is the wave height of the first wave train, x1 is the wave at a distance x1 meters from the first wave generator (i.e., x1 meters in front of the first wave generator), and k1 is the wave number of the first wave generator. Where B1 is the wavelength of the first wave.

[0096] The wave surface equation of the second wave generator 3 is:

[0097]

[0098] Where ω2 is the angular frequency of the second wave generator, t is time, H2 is the wave height of the second wave train, x2 is the wave at a distance of x2 meters from the second wave generator (i.e., x2 meters in front of the second wave generator), and k2 is the wave number of the second wave generator. Where B2 is the wavelength of the second wave.

[0099] III. The process of generating a focused wave

[0100] like Figure 4As shown, the target position for the focused wave formation in wave test tank 1 is determined. Then, the wave crest propagation time is calculated to obtain the wave velocity. Based on the wave velocity, the motion scale of the pusher plate can be determined. Both waves need to arrive at the target position at the same time. The calculation process is as follows:

[0101] First wave propagation time: Where x0 is the target location for the formation of the focused wave, which is x0 meters in front of the first wave generator 2, and c1 is the wave velocity of the first wave train.

[0102] The first wave should be initiated at the target activation time t = t0 - t1.

[0103] Second wave propagation time: Where c2 is the wave velocity of the second wave.

[0104] The second wave should be initiated at the target activation time t = t0 - t2.

[0105] Startup time difference:

[0106] At the target time (focusing time), the phases of the two waves at the target position should satisfy:

[0107] ω1(t0-t1)-k1x0=ω2(t0-t2)-k2(L-x0)+2nπ;

[0108] We get: (ω1-ω2)t0=2k1x0-2k2(L-x0)+2πn.

[0109] Where ω1 is the angular frequency of the first wave generator, t0 is the focusing time of the two waves, t1 is the propagation time of the first wave, and k1 is the wave number of the first wave generator; ω2 is the angular frequency of the second wave generator, L is the distance between the two wave generators, x0 is the target position, t2 is the propagation time of the second wave, k2 is the wave number of the second wave generator, and n is the number of periods.

[0110] When the wave periods of two waves are the same, the focal position satisfies: At this moment, both wave generators start simultaneously. The amplitude superposition is: A1 + A2, where, H1 and H2 are the wave heights of the first and second waves, respectively.

[0111] When the wave periods of the two waves are different, the instantaneous focusing condition is:

[0112]

[0113] Phase synchronization is achieved at the target time t0, and the superposition of amplitudes is: A1 + A2, where...

[0114] The wave generation control device for wave generators with two ends arranged in a wave test tank provided in the embodiments of the present invention will be described below. The wave generation control device for wave generators with two ends arranged in a wave test tank described below can be referred to in correspondence with the wave generation control method for wave generators with two ends arranged in a wave test tank described above.

[0115] First, combine Figure 5 This paper introduces the wave generation control device for wave generators positioned at both ends of a wave test tank, such as... Figure 5 As shown, the wave generation control device for wave generators positioned at both ends of the wave test pool may include:

[0116] The parameter determination unit 100 is used to determine the target position and target angular frequency of two waves based on the target function, wherein the target function is wave elimination, bidirectional wave, or focusing wave.

[0117] The propagation time calculation unit 200 calculates the propagation time of the two waves respectively;

[0118] The start-up time calculation unit 300 determines the target start-up time of the corresponding wave generator based on the propagation time.

[0119] The control unit 400 activates the corresponding wave generator at the moment the target is activated, generating corresponding waves based on the target wave height and the target angular frequency.

[0120] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0121] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0122] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wave generation control method for wave generators arranged at both ends in a wave test tank, characterized in that, include: The target positions and target angular frequencies of the two waves are determined based on the target functions, namely wave elimination, generation of bidirectional waves, and generation of focused waves. Calculate the propagation time of the two waves respectively; Determine the target start time of the corresponding wave generator based on the propagation time; The corresponding wave generator is activated at the moment the target is activated, and the corresponding wave is generated based on the target wave height and the target angular frequency. The process of determining the target location of two waves based on the target function includes: If the target function is to generate a focused wave, then the target position of the two waves is the focusing position; If the target function is wave suppression, then the target position of the first wave train is the position of the second wave generator; If the target function is to generate bidirectional waves, then the target positions of the two waves are the simulated locations of ocean structures.

2. The wave generation control method for wave generators arranged at both ends in a wave test tank according to claim 1, characterized in that, If the target function is to generate a focused wave, the calculation conditions for the target angular frequency include: At the target time, the phases of the two waves at the target location should satisfy: ； in, The angular frequency of the first wave generator. The moment when the two waves converge, For the propagation time of the first wave, The wave number of the first wave generator. The angular frequency of the second wave generator. L The distance between the two wave generators. For the target location, For the propagation time of the second wave, The wave number of the second wave generator. n The number of cycles; When the wave periods of the two waves are different, the instantaneous focusing condition is: 。 3. The wave-making control method of both-end layout wave makers in a wave test tank according to claim 1, characterized by, If the target function is wave suppression, the calculation conditions for the target angular frequency include: Wave face equation of the first wave maker at the time of arrival of the first wave to the second wave maker : ； wherein, is the angular frequency of the wave maker, t is the time step, L is the distance of the wave maker, H is the wave height; Wave face equation at second wave maker time is: ； wherein, x is the distance from the second wave maker to the second column, is the propagation time.

4. The wave-making control method of both-end layout wave makers in a wave test tank according to claim 1, characterized by, If the target function is to generate a two-way wave, the calculation conditions for the target angular frequency include: The wave surface equation of the first wave generator is: ； in, The angular frequency of the first wave generator. t For time, The wave height of the first wave. For distance from the first wave generator Waves at a distance of meters, The wave number of the first wave generator; The wave surface equation of the second wave generator is: ； in, The angular frequency of the second wave generator. t For time, The wave height of the second wave. For distance from the second wave generator Waves at a distance of meters, This is the wave number of the second wave generator.

5. A wave generation control device for wave generators arranged at both ends in a wave test tank, characterized in that, include: The parameter determination unit is used to determine the target position and target angular frequency of the two waves based on the target function, wherein the target function is wave elimination, generating bidirectional waves and generating focused waves. The propagation time calculation unit calculates the propagation time of the two waves respectively; The start-up time calculation unit determines the target start-up time of the corresponding wave generator based on the propagation time. The control unit activates the corresponding wave generator at the moment the target is activated, generating waves based on the target wave height and the target angular frequency. The process of determining the target location of two waves based on the target function includes: If the target function is to generate a focused wave, then the target position of the two waves is the focusing position; If the target function is wave suppression, then the target position of the first wave train is the position of the second wave generator; If the target function is to generate bidirectional waves, then the target positions of the two waves are the simulated locations of ocean structures.

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