CN112649174B - Water channel push plate type wave generating system in wind tunnel and wave generating method - Google Patents

Water channel push plate type wave generating system in wind tunnel and wave generating method Download PDF

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CN112649174B
CN112649174B CN202110004348.8A CN202110004348A CN112649174B CN 112649174 B CN112649174 B CN 112649174B CN 202110004348 A CN202110004348 A CN 202110004348A CN 112649174 B CN112649174 B CN 112649174B
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wave
push plate
water tank
sliding table
wave generating
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CN112649174A (en
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杨洪齐
张群
王静
杜海
柳淑学
李木国
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Dalian University of Technology
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Dalian University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/02—Wind tunnels
    • G01M9/04—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
    • G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
    • G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow

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Abstract

The invention discloses a push-plate type wave generating system and a wave generating method for a water channel in a wind tunnel, wherein the wave generating system comprises a main bearing mechanism of a wave generating machine, an electric actuating mechanism of the wave generating machine, a push rod shaft, a servo control cabinet, a computer and a test area wave height sensor; the second guide pair is fixedly arranged on two side walls of the unit body, the transmission mechanism in the unit body is connected with the second sliding table, the second sliding table is connected with the second guide pair in a sliding manner, and a motor connected with the transmission mechanism is arranged at one end of the unit body, which is positioned outside the water tank. The wave generator is divided into an inner part and an outer part of the water tank, so that the electric and high-precision transmission mechanisms are positioned outside the water tank, the influence of moisture and water on the service life of equipment is avoided, the maintenance of experimenters is facilitated, the dependence on a high-protection-level motor is avoided, and the investment cost is reduced.

Description

Water channel push plate type wave generating system in wind tunnel and wave generating method
Technical Field
The invention relates to a wave simulation system in the fields of coastal engineering, ocean engineering and ship engineering experiments, in particular to a push plate type wave generation system and a wave generation method for a water tank in a wind tunnel.
Background
In the fields of coastal engineering, ocean engineering, ship engineering and the like, waves, strong wind, ocean currents and the like are main loads of structures such as sea-crossing bridges, oil platforms, offshore wind power generation devices and the like. Taking a sea-crossing bridge as an example, the structure of the sea-crossing bridge is small in rigidity, large in flexibility and small in damping, and vortex-induced vibration can be generated under the action of wind; when waves act, the wave motion can change the characteristics of a wind field near a bridge, and a complex coupling effect is generated; the wave elements, if present, are further changed by the flow of the water particles. In order to more accurately evaluate the dynamic response characteristics of the structure in the complex marine environmental factors and avoid destructive events such as resonance, the response of the structure needs to be studied under the coupling effect of multiple environmental factors. Therefore, scientific researchers have proposed experimental research schemes for the coupling effect of wind, wave and flow. For example, patent application publication No. CN110879126A proposes a wind-wave-flow fully-coupled dynamic experimental system, patent application publication No. CN107543680A proposes an experimental system for realizing the coupling effect of wind, wave and rain, patent application publication No. CN103323210A proposes a large-scale maritime work wind tunnel wave trough device, patent application publication No. CN203231879U proposes a bridge wind-wave-flow coupling field, an elastic model and a dynamic response test system. In order to achieve simulation of waves in the respective systems, the above patents all describe in their solutions the use of wave generators for simulating the generation of waves. In fact, waves are simulated in a closed circulating wind tunnel by utilizing a push plate type wave-making principle, and a plurality of problems can exist by adopting the prior art.
As shown in fig. 1, a wind-wave coupling experiment simulation system composed of a vertical circulation wind tunnel and a water tank is taken as an example. The system consists of a circulating wind tunnel and a water tank, wherein a push plate type wave generator, a slope type energy dissipater and a wave generator rear energy dissipater are arranged in the water tank. The push plate type wave generator commonly used in the prior art can be referred to patent application with publication number CN209707064U, which is named as a push plate wave generator, regardless of the vertical lifting mechanism therein. Because the guide bracket of push pedal is mostly cantilever structure, for resisting the bending moment that the ripples in-process push pedal produced on guide bracket, increase guide bracket's height and just can strengthen structural rigidity. Therefore, a first problem arises: the height of the guide bracket occupies a larger part of the dry string, so that the distance from the water surface to the bottom boundary of the wind tunnel is too large. Too large a chord distance will cause the interaction of wind and waves to pass through the effective area of the experiment without reaching a stable stage, and the expected target of the coupling experiment device cannot be realized. The second problem is the influence of the closed environment in the wind tunnel and the water environment on the components and the electricity. As shown in fig. 1, in order to prevent the wave generator structure from generating turbulence and other influences on the wind field, rigid detachable cover plates are generally required to be erected on the tops of the wave generator and the energy dissipater, so that the wave generator is inevitably inconvenient to overhaul. Meanwhile, the closed humid environment affects the service life of the electrical equipment, and even the water level in the wave generating process rises to submerge the motor instantly. Although the motor with the protection grade above IP67 can resist instant immersion, the number of the selectable types is very small, and the rotating speed, the torque and the rotating inertia of the motor cannot meet the design requirements of different wave generators. The investment would be very costly if the motor is custom built.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a push plate type wave generating system and a wave generating method for a water tank in a wind tunnel. Meanwhile, the motor and the high-precision linear actuating mechanism are arranged outside the water tank by adopting the separated transmission mechanism, so that a closed water environment is avoided, and the purposes of facilitating overhaul and maintenance, prolonging the service life and reducing the cost are achieved.
In order to achieve the purpose, the technical scheme of the application is as follows: a water channel push plate type wave generating system in a wind tunnel comprises a wave generating machine main bearing mechanism, a wave generating machine electric actuating mechanism, a push rod shaft, a servo control cabinet, a computer and a test area wave height sensor, wherein the wave generating machine main bearing mechanism comprises a main sliding table beam, a push plate and a first guide pair; the wave generator electric actuating mechanism comprises a second sliding table, a second guide pair, a unit body and a motor; the first guide pair is fixedly arranged on two side walls of the water tank, a push plate is arranged in the water tank, the push plate is fixedly connected to the bottom of the main sliding table beam, and two ends of the main sliding table beam are respectively connected with the first guide pair in a sliding manner; the second guide pair is fixedly arranged on two side walls of the unit body, a transmission mechanism in the unit body is connected with a second sliding table, the second sliding table is connected with the second guide pair in a sliding manner, one end of the unit body positioned outside the water tank is provided with a motor connected with the transmission mechanism, the motor is connected with a computer through a servo control cabinet, the computer is also connected with a test area wave height sensor, and the test area wave height sensor is positioned in a test section of the water tank; and the push rod shaft penetrates through a wall-penetrating waterproof shaft sleeve on the rear wall of the water tank to be connected with a main bearing mechanism of the wave maker and an electric actuating mechanism of the wave maker.
Furthermore, wave making machine installation sections used for installing the first guide pair are arranged on two side walls of the water tank, the wave making machine installation sections are of a concrete structure or a steel structure, and a detachable cover plate is arranged above the wave making machine installation sections.
Furthermore, the push plate is made of stainless steel materials, a wave height sensor is installed on one side of the push plate, wave height data on the push plate are collected in real time, and the wave height data are fed back to a servo controller in the servo control cabinet in real time and used for the active correction control of the wave generator. The number of the wave height sensors can be two or more.
Furthermore, the first guide pair comprises two guide mechanisms, wherein the guide mechanisms are rolling linear guide rails or sliding linear guide rails and are respectively arranged on two side walls of the water tank or on the wave maker mounting section on the side wall of the water tank; the precision of the two sets of guide mechanisms is adjusted through the adjusting bolts on the guide mechanism.
Furthermore, the push rod shaft is a long rod round shaft, and rod end joint bearings with different models are arranged at two ends of the push rod shaft and are respectively connected with the second sliding table and the main sliding table beam through pin shafts; the influence of position degree errors between the first guide pair and the second guide pair on operation can be eliminated by adopting the rod end joint bearing.
Furthermore, the wall-through waterproof shaft sleeve is made of stainless steel or copper alloy and is arranged in a hole reserved on the rear wall of the water tank; the size of an inner hole of the wall-penetrating waterproof shaft sleeve is matched with the diameter of the push rod shaft, two or more than two sealing grooves are processed in the wall-penetrating waterproof shaft sleeve, and sealing rings are arranged in the sealing grooves and can be O-shaped sealing rings, Y-shaped sealing rings, V-shaped sealing rings and the like.
Furthermore, a transmission mechanism in the unit body converts the rotary motion of the motor into the linear motion of the second sliding table; the transmission mechanism comprises a ball screw, a gear rack, a synchronous toothed belt, an electric cylinder and the like.
The invention also provides a wave generating method based on the push plate type wave generating system of the water tank in the wind tunnel, which is implemented in the system and comprises the following specific steps:
step 1: according to the target wave eta to be generated0(t) obtaining the running track x of the push plate on the first guide pairgen(t) and converting xgen(t) converting into a pulse control signal of the motor;
target wave eta formed by superposing a plurality of cosine waves with different amplitudes, periods and initial phases0(t), expressed as:
Figure BDA0002882425150000041
wherein
Figure BDA0002882425150000042
For the random phase of the ith component wave, [0,2 π]Uniformly distributed random numbers, σiIs the angular frequency of the i-th component wave, aiFor the ith component wave amplitude, given a wave spectrum of S (σ) there is:
Figure BDA0002882425150000043
Δσifor the divided frequency interval, the wave spectrum S (sigma) is designed and selected according to the condition of the simulated sea area;
step 2: the servo controller controls a servo driver according to the pulse control signal, drives a motor to rotate, and drives a push plate to realize xgen(t) a running track to propel the water body to generate waves;
push plate moving track xgen(t) with the target wave η0The relationship of (t) is:
Figure BDA0002882425150000051
wherein j is an imaginary unit and represents that the phase difference of the time sequence is 90 degrees; c. C0And cnExpressed as a hydrodynamic transfer function:
Figure BDA0002882425150000052
Figure BDA0002882425150000053
wherein k is0And knThe dispersion equation is satisfied, and h is the water depth;
and step 3: the wave height sensor at one side of the push plate monitors waves on the plate surface in real time and records the waves as etaB(t) and feeding back the wave data to the servo controller in real time, and the target wave η0(t) comparing to obtain correction signal x of push plateabs(t) correcting the push plate motion in real time to xgen(t)+xabs(t) performing active corrective control so that the generated wave is closer to the target wave;
and 4, step 4: after the push plate stops running, the computer acquires the whole wave process recorded by the wave height sensor in the test area and records the whole wave process as etap(t) with the target wave η0(t) comparing, and if the precision error requirement is met, ending the experiment; if the requirement of precision error is not met, the running track of the push plate is corrected and generated
Figure BDA0002882425150000054
And returning to the step two for sequential execution.
Further, the correction signal x of the push plate in step 3abs(t) and the actually measured wave eta on the push plate surfaceB(t) and target wave η0The relationship of (t) is:
Figure BDA0002882425150000055
wherein N is a positive integer.
Further, the running track of the push plate is generated by correction in step 4
Figure BDA0002882425150000061
Wave data eta of whole process recorded by wave height sensor in test areap(t) and target wave η0The relationship of (t) is:
Figure BDA0002882425150000062
wherein each parameter satisfies the following relationship,
Figure BDA0002882425150000063
Figure BDA0002882425150000064
Snew(σ)＝S0(σ)+0.9(S0(σ)-Sp(σ))
Figure BDA0002882425150000065
due to the adoption of the technical scheme, the invention can obtain the following technical effects:
1. the wave maker main bearing mechanism (a mechanism bearing main load force in the working process) and the wave maker electric actuating mechanism (a high-precision transmission mechanism in the working process) are separated, and through the matching of the push rod shaft and the wall-penetrating waterproof shaft sleeve, the electric and high-precision transmission mechanism is positioned outside the water tank, so that the influence of the water environment and the closed environment is avoided, the influence of humidity and water on the service life of equipment can be avoided, and the maintenance is favorably realized by experimenters at any time. The scheme avoids the dependence on a high-protection-level motor and reduces the input cost.
2. The wave maker main bearing mechanism adopts a large-span guide mechanism scheme, and the guide mechanism is arranged on the water tank wall or an independent foundation outside the water tank wall, so that a guide support structure in the prior art can be eliminated, the dry-string distance between a wind field and a wave field in the water tank is reduced, and the controllability of wind parameters is enhanced. The dry-string distance is reduced, which is beneficial to the wind field and the wave field to achieve stable coupling effect as soon as possible.
3. The wave making method provided by the invention can reduce the precision error of the simulated wave through the proposed double closed-loop feedback correction control method, thereby ensuring the precision of the physical model test.
Drawings
FIG. 1 is a schematic diagram of a wind-wave coupling experiment simulation system;
FIG. 2 is a schematic axial view of a water channel push plate type wave generating system in a wind tunnel;
FIG. 3 is a schematic elevation view of a water channel push plate type wave generating system in a wind tunnel;
FIG. 4 is a schematic view of a push rod shaft in a wind tunnel water tank push plate type wave generating system;
fig. 5 is a schematic view of a wall-through waterproof shaft sleeve in a wind tunnel water tank push plate type wave generating system.
Icon: 1-wave making machine mounting section; 2-pushing the plate; 2 a-push plate wave height sensor; 3-a first guiding pair; 4-main slipway beam; 5-push rod shaft; 5 a-rod end joint bearing; 5 b-a rod end joint bearing; 6-wall waterproof shaft sleeve; 6 a-sealing the trench; 6 b-sealing the trench; 7-a second slipway; 8-a second guiding pair; 9-a motor; 10-unit body; 11-a frame; 12-a servo control cabinet; 13-a computer; 14-test zone wave height sensor; 15-wave maker rear energy dissipater; 16-removable cover plate.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples: the present application is further described by taking this as an example.
Example 1
The embodiment provides a push plate type wave generating system for a water channel in a wind tunnel, which comprises a wave generator mounting section 1, a push plate 2, a first guide pair 3, a main sliding table beam 4, a push rod shaft 5, a wall-through waterproof shaft sleeve 6, a second sliding table 7, a second guide pair 8, a motor 9, a unit body 10, a rack 11, a servo control cabinet 12, a computer 13 and a test area wave height sensor 14;
as shown in fig. 2 and 3, the first guide pair 3 is mounted on both side walls of the wave maker mounting section 1. The push plate 2 is positioned in the water tank and is fixedly connected with the main sliding table beam 4. Two ends of the main sliding table beam 4 are respectively connected with the first guide pair 3 in a sliding manner, so that a rigid body formed by the main sliding table beam 4 and the push plate 2 can slide on the first guide pair 3. The main sliding table beam 4, the push plate 2 and the first guide pair 3 jointly form a main bearing mechanism of the wave maker.
As shown in fig. 2 and 3, the second sliding table 7 is slidably connected to the second guiding pair 8, in this embodiment, the second guiding pair 8 is fixedly installed on the unit body 10, and the second sliding table 7 is connected to the transmission mechanism in the unit body 10. The motor 9 is arranged at one end of the unit body 10 and drives the second sliding table 7 to realize linear motion through a transmission mechanism. The second sliding table 7, the second guide pair 8, the unit body 10 and the motor 9 together form an electric actuating mechanism of the wave generator, and are arranged on a frame 11 outside the water tank.
As shown in fig. 2 and 3, the push rod shaft 5 passes through the wall-through waterproof bushing 6 on the rear wall of the water tank to connect the main bearing mechanism of the wave generator and the electric actuator of the wave generator.
As shown in fig. 2 and 3, motor 9 passes through cable junction servo control cabinet 12, and computer 13 calculates out operation data according to the experiment demand, gives the controller in servo control cabinet 12 with data transmission through the cable, and control servo driver driving motor 9 is rotatory to drive second slip table 7 and be linear motion, and then drive main slip table roof beam 4 and push pedal 2 by push rod shaft 5 and slide on first direction is vice 3, promote the water in the basin and produce the wave.
As shown in fig. 2 and 3, the wave generator installation section 1 in this embodiment is a concrete structure, and a detachable cover plate 13 is installed above the wave generator installation section. According to the design requirement, the wave making machine installation section 1 can also be of a steel structure.
As shown in fig. 2 and 3, the push plate 2 is made of 304 stainless steel material, and in this embodiment, two wave height sensors 2a are installed on the plate surface to collect wave height data on the push plate in real time for active correction control of the wave making machine. The number of wave height sensors 2a may be two or more depending on the width of the water tank.
As shown in fig. 2 and 3, the first guiding pair 3 includes two sets of guiding mechanisms, in this embodiment, the guiding mechanisms are rolling linear guide rails, the guide rails are respectively installed on two side walls of the water tank, the precision of the two guide rails is adjusted by adjusting bolts on the guide rails, and each guide rail is respectively provided with two ball sliders which are connected with the main sliding table beam 4 through bolts. According to design requirements, the first guide pair 3 can also be a sliding linear guide rail or a gear train guide device, and the installation position of the first guide pair can also be positioned on an independent foundation outside the side wall of the water tank.
As shown in fig. 2, 3 and 4, the push rod shaft 5 is a long rod round shaft, penetrates through the wave maker rear energy dissipater 15 and the wall-penetrating waterproof shaft sleeve 6, and is connected with the main sliding table beam 4 through the second sliding table 7 of the pin shaft at two ends. Two ends of the push rod shaft 5 are rod end joint bearings 5a and 5b with different models. The influence of position degree errors between the first guide pair 3 and the second guide pair 8 on operation can be eliminated by adopting the rod end joint bearing.
As shown in fig. 4 and 5, the material of the through-wall waterproof sleeve 6 in this example is 304 stainless steel, and is installed in a hole reserved on the rear wall of the water tank. The inner hole size of the wall-through waterproof shaft sleeve 6 is matched with the push rod shaft 5, two sealing grooves 6a and 6b are processed in the shaft sleeve, and a Y-shaped sealing ring is installed in each sealing groove. When the push rod shaft 5 moves in the direction of the axis in the wall-through waterproof shaft sleeve, the water leakage caused by instantaneous water body height surge in the water tank is prevented through the sealing ring action in the sealing grooves 6a and 6b, and the side of the electric actuating mechanism of the wave maker is protected. According to the design requirement, the material of the wall-penetrating waterproof shaft sleeve 6 can also be copper alloy, the number of the sealing grooves can be two or more than two according to the thickness of the wall body, and the sealing rings can also be O-shaped sealing rings, V-shaped sealing rings and the like.
As shown in fig. 3, the transmission mechanism in the unit 10 in this embodiment may be a ball screw, which can convert the rotation of the motor into the linear motion of a nut on the screw, and the nut is connected to the second sliding table, so as to drive the second sliding table 7 to make linear motion. The transmission mechanism can also select the forms of a gear rack, a synchronous toothed belt, an electric cylinder and the like. When the transmission mechanism is a gear rack, the rack is positioned in the unit body and is meshed with the gear, and the gear is respectively connected with the second sliding table and the motor. When the transmission mechanism is a synchronous toothed belt, the synchronous toothed belt is connected with the second sliding table, the synchronous toothed belt is sleeved on a driving wheel and a driven wheel in the unit body, and the driving wheel is connected with the motor. When the transmission mechanism is an electric cylinder, the input shaft of the electric cylinder is connected with the output shaft of the motor, and the push rod of the electric cylinder is connected with the second sliding table.
The embodiment also provides a wave generating method based on the wind tunnel inner water tank push plate type wave generating system, which comprises the following specific steps:
step 1: according to the target wave to be generatedWave eta0(t) calculating the running track x of the push plate on the first guide pair 3gen(t) and converting xgen(t) into a pulse control signal for the motor 9;
target wave eta formed by superposing a plurality of cosine waves with different amplitudes, periods and initial phases0(t), expressed as:
Figure BDA0002882425150000101
wherein
Figure BDA0002882425150000102
For the random phase of the ith component wave, [0,2 π]Uniformly distributed random numbers, σiIs the angular frequency of the i-th component wave, aiFor the ith component wave amplitude, given a wave spectrum of S (σ) there is:
Figure BDA0002882425150000103
Δσifor the divided frequency interval, the wave spectrum S (sigma) is designed and selected according to the condition of the simulated sea area;
step 2: a servo controller in the servo control cabinet 12 controls a servo driver according to the pulse control signal to drive the motor 9 to rotate and drive the push plate to realize xgen(t) pushing the water body to generate waves.
Push plate moving track xgen(t) with the target wave η0The relationship of (t) is:
Figure BDA0002882425150000104
wherein j is an imaginary unit and represents that the phase difference of the time sequence is 90 degrees; c. C0And cnExpressed as a hydrodynamic transfer function:
Figure BDA0002882425150000111
Figure BDA0002882425150000112
wherein k is0And knThe dispersion equation is satisfied, and h is the water depth;
and step 3: the wave height sensor 2a on the surface of the push plate monitors the waves on the surface of the plate in real time and records the waves as etaB(t) and feeding back the wave data to the servo controller in real time, and the target wave η0(t) comparing and calculating to obtain correction signal x of push plateabs(t) correcting the push plate motion in real time to xgen(t)+xabs(t) performing active correction control so that the waves generated by the wave generator are closer to the target waves;
push plate real-time correction signal xabs(t) and the actually measured wave eta on the push plate surfaceB(t) and target wave η0(t) a relationship of
Figure BDA0002882425150000113
Wherein N is a positive integer;
and 4, step 4: after the push plate stops running, the computer 13 obtains the whole wave process recorded by the wave height sensor 14 in the test area and records the whole wave process as etap(t) with the target wave η0(t) comparing and calculating, and if the precision error requirement is met, ending the experiment; if the precision error requirement is not met, correction generation is carried out
Figure BDA0002882425150000114
And returning to the step two for sequential execution.
Corrected running track of push plate
Figure BDA0002882425150000115
Wave data eta of whole process recorded by wave height sensor in test areap(t) and target wave η0(t) a relationship of
Figure BDA0002882425150000116
Wherein each parameter satisfies the following relationship,
Figure BDA0002882425150000121
Figure BDA0002882425150000122
Snew(σ)＝S0(σ)+0.9(S0(σ)-Sp(σ))
Figure BDA0002882425150000123
Figure BDA0002882425150000124
the wave making method provided by the invention can reduce the precision error of the simulated wave through the proposed double closed-loop feedback correction control method, thereby ensuring the precision of the physical model test.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (3)

1. A wave generation method based on a water tank push plate type wave generation system in a wind tunnel is characterized by comprising the following specific steps:
step 1: according to the target wave eta to be generated0(t) obtaining the running track x of the push plate on the first guide pairgen(t)，And x isgen(t) converting into a pulse control signal of the motor;
target wave eta formed by superposing a plurality of cosine waves with different amplitudes, periods and initial phases0(t), expressed as:
Figure FDA0003242019920000011
wherein
Figure FDA0003242019920000012
For the random phase of the ith component wave, [0,2 π]Uniformly distributed random numbers, σiIs the angular frequency of the i-th component wave, aiFor the ith component wave amplitude, given a wave spectrum of S (σ) there is:
Figure FDA0003242019920000013
Δσifor the divided frequency interval, the wave spectrum S (sigma) is designed and selected according to the condition of the simulated sea area;
step 2: the servo controller controls a servo driver according to the pulse control signal, drives a motor to rotate, and drives a push plate to realize xgen(t) a running track to propel the water body to generate waves;
push plate moving track xgen(t) with the target wave η0The relationship of (t) is:
Figure FDA0003242019920000014
wherein j is an imaginary unit and represents that the phase difference of the time sequence is 90 degrees; c. C0And cnExpressed as a hydrodynamic transfer function:
Figure FDA0003242019920000015
Figure FDA0003242019920000016
wherein k is0And knThe dispersion equation is satisfied, and h is the water depth;
and step 3: the wave height sensor at one side of the push plate monitors waves on the plate surface in real time and records the waves as etaB(t) and feeding back the wave data to the servo controller in real time, and the target wave η0(t) comparing to obtain correction signal x of push plateabs(t) correcting the push plate motion in real time to xgen(t)+xabs(t) performing active corrective control so that the generated wave is closer to the target wave;
and 4, step 4: after the push plate stops running, the computer acquires the whole wave process recorded by the wave height sensor in the test area and records the whole wave process as etap(t) with the target wave η0(t) comparing, and if the precision error requirement is met, ending the experiment; if the requirement of precision error is not met, the running track of the push plate is corrected and generated
Figure FDA0003242019920000021
And returning to the step two for sequential execution;
the method is implemented in a wave making system, the wave making system comprises a wave making machine main bearing mechanism, a wave making machine electric actuating mechanism, a push rod shaft, a servo control cabinet, a computer and a test area wave height sensor, and the wave making machine main bearing mechanism comprises a main sliding table beam, a push plate and a first guide pair; the wave generator electric actuating mechanism comprises a second sliding table, a second guide pair, a unit body and a motor; the first guide pair is fixedly arranged on two side walls of the water tank, a push plate is arranged in the water tank, the push plate is fixedly connected to the bottom of the main sliding table beam, and two ends of the main sliding table beam are respectively connected with the first guide pair in a sliding manner; the second guide pair is fixedly arranged on two side walls of the unit body, a transmission mechanism in the unit body is connected with a second sliding table, the second sliding table is connected with the second guide pair in a sliding manner, one end of the unit body positioned outside the water tank is provided with a motor connected with the transmission mechanism, the motor is connected with a computer through a servo control cabinet, the computer is also connected with a test area wave height sensor, and the test area wave height sensor is positioned in a test section of the water tank; and the push rod shaft penetrates through a wall-penetrating waterproof shaft sleeve on the rear wall of the water tank to be connected with a main bearing mechanism of the wave maker and an electric actuating mechanism of the wave maker.
2. The wave generation method based on the water channel push plate type wave generation system in the wind tunnel according to claim 1, characterized in that the correction signal x of the push plate in the step 3abs(t) and the actually measured wave eta on the push plate surfaceB(t) and target wave η0The relationship of (t) is:
Figure FDA0003242019920000031
wherein N is a positive integer.
3. The wave generation method based on the water channel push plate type wave generation system in the wind tunnel according to claim 1, characterized in that the generated push plate running track is corrected in the step 4
Figure FDA0003242019920000032
Wave data eta of whole process recorded by wave height sensor in test areap(t) and target wave η0The relationship of (t) is:
Figure FDA0003242019920000033
wherein each parameter satisfies the following relationship,
Figure FDA0003242019920000034
Figure FDA0003242019920000035
Snew(σ)＝S0(σ)+0.9(S0(σ)-Sp(σ))
Figure FDA0003242019920000036
CN202110004348.8A 2021-01-04 2021-01-04 Water channel push plate type wave generating system in wind tunnel and wave generating method Active CN112649174B (en)

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