CN101832855A - Active reflection compensation servo-type single-board wave making device - Google Patents

Abstract

The invention provides an active reflection compensation type single-board wave making device which comprises a computer control and drive system, a mechanical system and a wave measurement and feedback system which are sequentially connected. By adopting an active reflection compensation wave making technology, waves meeting the requirement of test precision are made, and meanwhile, waves reflected from a ship model, an opposite pool wall and a wave absorber can be effectively eliminated; and more than 80 percent of reflection waves are absorbed, thus the condition that the reflection waves strike a wave making mechanism to generate reflection waves once again is avoided so as to effectively improve the wave simulation quality of a pool or a water tank. A servo motor is used as a drive device, and a stepper motor control card and an encoder counting card are adopted to carry out two-position control, thereby the frequency response and the wave making control precision are improved, the drive mechanism is simplified and the maintenance cost is greatly reduced.

Description

The active reflection compensation servo-type single-board wave making device

Technical field

The invention belongs to the hydrodynamic test field tests, relate to the one-board wave simulation mechanism that is used for tank or pond, be specifically related to a kind of active reflection compensation servo-type single-board wave making device.

Background technology

In wave simulation test, pool wall is the border of a sealing around the experimental tank, when the wave making machine of certain limit pool wall produce carry out ripple be delivered in the pond by test object or pool wall the time can produce reflection wave; When being delivered to wave making machine, reflection wave can produce reflection wave more again.Reflection wave is non-existent on actual sea again, because the border on actual sea is open, reflection wave is in wide marine site transmittance process, and its energy is consumed.In the experimental tank again the existence of reflection wave can make the incident field of expectation produce distortion, make the analog distortion of wave environment, thereby influence model test result's degree of accuracy, this is a difficult problem that perplexs wave model test for a long time.

The ripple drive unit of making of existing wave making machine is mainly fan blower, inertia motor or fluid pressure drive device, adopt the wave maker of fan blower or inertia motor to have the low and not high shortcoming of control accuracy of wave simulation frequency, and fluid pressure drive device is because mechanism's more complicated, cost is higher, and the maintaining cost is also higher.

The content of invention

In order to overcome the deficiencies in the prior art part, the applicant improves through research, a kind of active reflection compensation servo-type single-board wave making device is provided, in the wave of producing the Pass Test accuracy requirement, can effectively eliminate the wave that reflects from ship model, opposite pool wall and wave suppression arrangement, improve the quality of pond or tank wave simulation, improve the control accuracy of wave paddle simultaneously, the driving mechanism of simplifying reduces the maintaining cost.

Technical scheme of the present invention is as follows:

A kind of active reflection compensation formula single-board wave making device comprises the computer control drive system, mechanical system and the wave measurement feedback system that are linked in sequence;

Described computer control drive system is made up of computer control unit, electric-motor drive unit and AC servo motor; Computer control unit receiving target signal, drive AC servo motor by electric-motor drive unit, AC servo motor is delivered to described mechanical system with kinetic energy, and position signalling fed back to computer control unit and electric-motor drive unit, computer control unit receives the unrestrained high feedback signal that described wave measurement feedback system transmits simultaneously;

Described mechanical system is made up of shaft coupling, bearing, screw mandrel, slide block, drive link and rocker; In the fixed position, described AC servo motor is connected with screw mandrel by shaft coupling screw mandrel by Bearing Installation, and screw mandrel is provided with slide block, and slide block connects rocker by drive link, and rocker connects described wave measurement feedback system;

Described wave measurement feedback system is made up of wave height recorder and signal cable; Wave height recorder is connected with described rocker, and wave height recorder is connected with described computer control unit by signal cable.

Useful technique effect of the present invention is:

(1) the present invention adopts the active reflection compensation to make wave technology, in the wave of producing the Pass Test accuracy requirement, can eliminate the wave that reflects from ship model, opposite pool wall and wave suppression arrangement effectively, absorb reflection wave more than 80%, thereby avoid their bump wave making machine structures to produce reflection wave once more, effectively improve the quality of pond or tank wave simulation.

(2) the present invention adopts servomotor as drive unit, computer control unit adopts stepping motor control card and encoder to count to stick into the control of capable two-position, effectively improves frequency response, improves control accuracy, simplify driving mechanism, greatly reduce the cost of maintaining.

(3) mechanical part adopts screw mandrel to drive, and control section adopts unrestrained height and position dual signal feedback, has improved control accuracy.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the working method synoptic diagram that rocker is made ripple.

Fig. 3 is an active reflection compensation structural drawing.

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.

As shown in Figure 1, the present invention includes computer control drive system A, mechanical system B and the wave measurement feedback system C that is linked in sequence.

See Fig. 1, computer control drive system A is made up of computer control unit 1, electric-motor drive unit 2 and AC servo motor 3.Computer control unit 1 receiving target signal, drive AC servo motor 3 by electric-motor drive unit 2, AC servo motor 3 is delivered to mechanical system B with kinetic energy, and position signalling fed back to computer control unit 1 and electric-motor drive unit 2, computer control unit 1 receives the unrestrained high feedback signal that wave measurement feedback system C transmits simultaneously.

See Fig. 1, mechanical system B is made up of shaft coupling 4, bearing 5, screw mandrel 6, slide block 7, drive link 8 and rocker 9.Screw mandrel 6 is installed in the fixed position by bearing 5, and AC servo motor 3 is connected with screw mandrel 6 by shaft coupling 4, and screw mandrel 6 is provided with slide block 7, and slide block 7 connects rocker 9 by drive link 8, and rocker 9 connects wave measurement feedback system C.

See Fig. 1, wave measurement feedback system C is made up of wave height recorder 10 and signal cable 11.Wave height recorder 10 is connected with rocker 9, and wave height recorder 10 is connected with computer control unit 1 by signal cable 11.

The following describes principle of work of the present invention:

After the present invention starts, with the hardware of automatic detection computations machine control-driven system A and adjust the initial position of rocker 9.Computer control unit 1 reads echo signal from computer documents, the wave data that promptly will make, receive high feedback of wave and position feedback adjustment data simultaneously to the rocker position, computing module by inside, generate output control data input electric-motor drive unit 2, drive AC servo motor 3 by electric-motor drive unit 2.Computer control unit 1 adopts stepping motor control card and encoder to count to stick into the control of capable two-position, effectively improves frequency response, improves control accuracy.AC servo motor 3 drives screw mandrel 6 by shaft coupling 4 and rotates back and forth, thereby slide block 7 is moved forward and backward, and slide block 7 drives rocker 9 swings by drive link 8, causes wave.Wave height recorder 10 is gathered unrestrained high information, and is constantly given computer control unit 1 with the high information feedback of wave by signal cable 11 with rocker 9 motions, adjusts controlled quentity controlled variable by calculating, and carries out reflection compensation, intends the influence of test thereby effectively eliminate reflection wave to making mode.The positional information of rocker 9 also will be fed back simultaneously, make computer control drive system A can monitor the motion and the position of rocker 9 constantly, adjust controlled quentity controlled variable when rocker transfinites position, rocker zero migration, the protection wave maker.

The following describes the initiatively principle of reflection compensation of the present invention:

Fig. 2 shows the working method synoptic diagram that rocker is made ripple.As shown in Figure 2, X (t) is the movement-state of rocker, comprises and makes wave motion X _I(t) and wave absorption motion X _RSo X (t)=X (t), _I(t)+X _R(t); η _I(t) for making the object wave that the wave system system generates; η _R(t) be reflection wave.Make the ripple theory according to relevant, establishing Φ is velocity potential, and following system of equations is then arranged:

Φ _xx+Φ _zz＝0?(0≤x＜∞，-h≤z≤0) (1)

Φ _z＝0 (z＝-h) (2)

Φ _tt+gΦ _z＝0?(z＝0) (3)

Φ _x＝X _t (x＝0) (4)

Can obtain output waveform η by finding the solution Φ _O(t):

${\mathrm{\η}}_o=\frac{1}{g}\frac{\∂\mathrm{\Φ}}{\∂t}{|}_{x=0,z=0}=-\mathrm{iAX}+2\mathrm{iA}{X}_I+\mathrm{DX}---\left(5\right)$

Wherein

$A=\frac{4{\mathrm{<figure-callout\; id="2"\; label="sinh"\; filenames="HSA00000104418300013.png"\; state="\{\{state\}\}">sinh</figure-callout>}}^2\mathrm{<figure-callout\; id="2"\; label="kh"\; filenames="HSA00000104418300013.png"\; state="\{\{state\}\}">kh</figure-callout>}}{2\mathrm{kh}+\sinh 2\mathrm{kh}},$ $D=\underset{n=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{D}_n=\underset{n=1}{\overset{\&infin;}{\mathrm{\&Sigma;}}}\frac{4{\sin }^2{k}_{n}h}{2k_{n}h+\sin 2k_{n}h}$

K and k _nBe equation ω ²/ g=k tanh kh=-k _nTan k _nThe positive root of h, ω are the angular frequency that rocker rotates.Can release following wave absorption equation by formula (5):

X _t＝(ω/A){2η _I-(η _O-DX)} (6)

The system that satisfies this equation is exactly the active reflection compensation system of needs of the present invention.

Just can construct as shown in Figure 3 the initiatively linear control system of the present invention of reflection compensation structure according to equation (6).

N/N among Fig. 3 _REFTransition function for servomotor; K ₁Transition function (wave height recorder is installed on the rocker) for wave height recorder; K ₂Be the compensate for electronic wave filter, and above Several Parameters satisfies following equation:

$K_1{K}_{2}N/N_{\mathrm{REF}}\&cong;1$ Or ${\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HSA00000104418300013.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&cong;N_{\mathrm{REF}}/K_{1}N$ (7)

Above-described only is preferred implementation of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present invention and design, all should think to be included within protection scope of the present invention.

Claims (1)

1. an active reflection compensation formula single-board wave making device is characterized in that, comprises the computer control drive system, mechanical system and the wave measurement feedback system that are linked in sequence;

Described computer control drive system is made up of computer control unit, electric-motor drive unit and AC servo motor; Computer control unit receiving target signal, drive AC servo motor by electric-motor drive unit, AC servo motor is delivered to described mechanical system with kinetic energy, and position signalling fed back to computer control unit and electric-motor drive unit, computer control unit receives the unrestrained high feedback signal that described wave measurement feedback system transmits simultaneously;

Described mechanical system is made up of shaft coupling, bearing, screw mandrel, slide block, drive link and rocker; In the fixed position, described AC servo motor is connected with screw mandrel by shaft coupling screw mandrel by Bearing Installation, and screw mandrel is provided with slide block, and slide block connects rocker by drive link, and rocker connects described wave measurement feedback system;

Described wave measurement feedback system is made up of wave height recorder and signal cable; Wave height recorder is connected with described rocker, and wave height recorder is connected with described computer control unit by signal cable.

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