CN105486487A - Wave detection system - Google Patents

Abstract

The invention provides a wave detection system including a data processor, a data collector, a wave-height gauge, and a flow velocity instrument, one end of the wave-height gauge leads out of the liquid surface and the other end of the wave-height gauge is immersed into the fluid, The flow velocity instrument is arranged in the fluid, the wave-height gauge and the flow velocity instrument are arranged on the same section, the data collector acquires the signals fed back by the wave-height gauge, and the flow velocity instrument and transmits the signals to the data processor. The system is high in precision, wide in application, and flexible in instrument arrangement, can obtain the time domain process curve of the incident wave and the reflection wave, is suitable for regular wave and irregular wave, and effectively improves the accuracy of a wave model test.

Description

A kind of wave detection system

Technical field

The invention belongs to oceanographic engineering field, especially relate to a kind of wave detection system.

Background technology

In oceanographic engineering, wave can reflect on hydraulic structure, and the design of characteristic parameter to oceanographic engineering buildings accurately obtaining reflection wave has great importance.Meanwhile, in In Physical Model Experiment of Ocean Engineering, can there is secondary reflection in reflection wave on wave paddle, and eliminating secondary reflection also needs to be separated entering reflection wave.The common reflection wave separation method that enters has the two-point method and three point method measured based on wave height.These two kinds of methods are all carry out separation of incident and reflected waves by the water surface process of record tank different section, and these two kinds of methods exist several shortcoming, and one is owing to there is singular point, therefore has certain restriction to the arrangement pitch of wave-height gauge; Two is have applicable band to limit, and the gravity wave applicability longer for the cycle is not strong; Although it is wider that three point method is suitable for frequency range, but still cannot obtain the water surface process of incident wave and reflection wave, also just wave statistics analysis cannot be carried out exactly.For overcoming the deficiency of said method, the present invention proposes a kind of wave detection system measured based on flow velocity and wave height.

Summary of the invention

In view of this, the present invention is intended to propose a kind of wave detection system.

Technical scheme of the present invention is achieved in that

A kind of wave detection system, comprise data processor, data acquisition unit, wave-height gauge and current meter, one end of described wave-height gauge is exposed liquid level one end and is immersed in fluid, described current meter is arranged in fluid, described wave-height gauge and current meter are arranged in same section, described data acquisition unit collects the signal of described wave-height gauge and current meter feedback, and passes to described data processor.

Further, the sample frequency of described current meter is greater than 20HZ.

Further, described current meter is little prestige dragon current meter, electromagnetic current metre.

Further, the sample frequency of described wave-height gauge is greater than 20HZ.

Further, described wave-height gauge can adopt resistance-type or condenser type wave-height sensing device.

Further, described data processor is computing machine.

The advantage that the present invention has and good effect are:

Native system precision is high, applied widely, instrument layout flexible, can obtain the time domain procedures curve of incident wave and reflection wave, be applicable to regular wave and irregular wave, effectively improve the accuracy of wave model test.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structural representation of native system.

In figure:

1, data processor 2, data acquisition unit 3, wave-height gauge 4, current meter 5, tank

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention; those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite; all belong to the scope of protection of the invention, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.

Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.

Secondly, the present invention is described in detail in conjunction with schematic diagram, when describing the embodiment of the present invention in detail; for ease of explanation; the sectional view of indication device part structure can be disobeyed general ratio and be made partial enlargement, and described schematic diagram is example, and it should not limit the scope of protection of the invention at this.In addition, the three-dimensional space of length, width and height should be comprised in actual fabrication.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " etc. only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, one or more these features can be expressed or impliedly be comprised to the feature being limited with " first ", " second " etc.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.

In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood by concrete condition.

The cardinal principle proposing a kind of wave detection system measured based on flow velocity and wave height provided by the invention is as follows: from Wave Theory, there is the kinematic relation showing (1) between the horizontal component velocity of wave water particle motion and water surface process:

$u=\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×\mathrm{\η}---\left(1\right)$

$K_u=\frac{\cosh \left(k\right(h+z_u)}{\cosh \left(kh\right)}---\left(2\right)$

In formula, u is horizontal flow velocity, and η is water surface process, and k is wave number, and ω is angular frequency, K _ucharacterize the proportionate relationship between lower layer of water particle and superficial water particle flow velocity, be called the speed responsive factor.Above-mentioned kinematic relation formula is carried out Fourier transform and can obtain flow velocity on frequency domain and water surface procedure relation, be shown below.

$F_u=\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×F_{\mathrm{\η}}---\left(3\right)$

Therefore, incident wave and reflection wave can be expressed as respectively:

$F_{u,i}=\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×F_{\mathrm{\η},i}---\left(4\right)$

$F_{u,r}=\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×F_{\mathrm{\η},r}---\left(5\right)$

Due to the superposition that actual measurement water surface process is incident wave water surface process and reflection wave water surface process, frequency domain can be expressed as the superposition of incident wave and reflection wave, shown in (6):

F _η＝F _η,i+F _η,r(6)

Wherein subscript i represents incident wave, and r represents reflection wave.

In like manner there is the relation that formula (7) represents in the horizontal component velocity of water particle motion on frequency domain:

F _u＝F _u,i+F _u,r(7)

Simultaneous formula (4), (5), (6) and (7) then can obtain incident wave and the value of reflection wave on frequency domain, shown in (8) and (9) formula.

$F_{\mathrm{\η},i}=\frac{\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×F_{\mathrm{\η}}+F_u}{2\frac{gk}{\mathrm{\ω}}{K}_u}---\left(8\right)$

$F_{\mathrm{\η},r}=\frac{\left(\frac{gk}{\mathrm{\ω}}{K}_u\right)\×F_{\mathrm{\η}}-F_u}{2\frac{gk}{\mathrm{\ω}}{K}_u}---\left(9\right)$

Because complete remains real part and imaginary part, F _ηmould characterize wave amplitude, the ratio of real part and imaginary part characterizes the phasing degree of ripple, so carry out inverse Fourier transform to it can obtain water surface graph.

As shown in Figure 1, the present invention includes data processor (computing machine) 1, data acquisition unit 2, wave-height gauge 3, current meter 4 and tank 5, the long 45m of described tank, wide 1m, high 1m, described wave-height gauge 3 is resistance-type wave-height sensing device, be arranged on the inwall of described tank 5, and described wave-height gauge 3 half surfaces, half is immersed in the water, described current meter 4 is little prestige dragon current meter, be installed on the centre position of section residing for described wave-height gauge 3, and the measuring sonde of described current meter 4 is apart from bottom of gullet 20cm, described data acquisition unit 2 collects the signal of described wave-height gauge 3 and current meter 4 feedback, and pass to described data processor 1.

During test, the sample frequency of described wave-height gauge 3 and current meter 4 is 20Hz, open and the wave height process values of synchro measure place section and flow speed value simultaneously, and be transferred in computing machine by described data acquisition unit 2, through the calculating of formula (1) ~ (9), utilize Fourier transform and inverse fourier transform technology, the wave height conditional curve of analytic record and horizontal flow velocity conditional curve, obtain the time domain procedures curve of incident wave and reflection wave, calculate the characteristic parameter of wave.

Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (6)

1. a wave detection system, it is characterized in that: comprise data processor (1), data acquisition unit (2), wave-height gauge (3) and current meter (4), one end of described wave-height gauge (3) is exposed liquid level one end and is immersed in fluid, described current meter (4) is arranged in fluid, described wave-height gauge (3) and current meter (4) are arranged in same section, described data acquisition unit (2) collects the signal that described wave-height gauge (3) and current meter (4) feed back, and passes to described data processor (1).

2. wave detection system according to claim 1, is characterized in that: the sample frequency of described current meter (4) is greater than 20HZ.

3. wave detection system according to claim 2, is characterized in that: described current meter (4) is little prestige dragon current meter, electromagnetic current metre.

4. wave detection system according to claim 1 and 2, is characterized in that: the sample frequency of described wave-height gauge (3) is greater than 20HZ.

5. wave detection system according to claim 4, is characterized in that: described wave-height gauge (3) can adopt resistance-type or condenser type wave-height sensing device.

6. wave detection system according to claim 1 and 2, is characterized in that: described data processor (1) is computing machine.