CN108254157A - A kind of interior wave and the experimental system of submerged body interaction - Google Patents

Abstract

The invention discloses an experimental system for the interaction between an internal wave and a submersible body, comprising: a submersible body model, a motion simulation component, a motion recording component and an experiment tank. The submersible body model includes a submersible body shell and a first counterweight. The counterweight is placed in the shell of the submersible. Therefore, the experimental system for the interaction between the internal wave and the submerged body provided by the embodiment of the present invention utilizes the connection of the spherical hinge universal joint so that the submerged body can rotate in three directions relative to the connecting rod, and utilizes the three-way The electronic gyroscope records the angular velocity of the submersible in the X, Y, and Z directions in real time, and simultaneously records the acceleration in the X, Y, and Z directions of the submersible, and uses three pressure sensors to record the submersible model and the connecting rod during the traveling process of the internal solitary wave The internal solitary wave force in the three directions of X, Y, and Z on the component, and then the recorded results are transmitted to the display through the wire, and the force measurement data is displayed in real time and recorded in the data file.

Description

An Experimental System for Interaction Between Internal Wave and Submarine

technical field

The invention relates to the technical field of ocean internal wave experiments, in particular to an experimental system for the interaction between internal waves and submerged bodies.

Background technique

Ocean internal waves are a form of fluctuations that occur below the surface of seawater, and are a type of gravity wave, or internal inertial gravity wave. In recent decades, experts and scholars from various countries have discovered through actual measurement or remote sensing that internal waves are a very common natural phenomenon in the ocean. The wavelength range of internal waves in the ocean generally ranges from hundreds of meters to tens of kilometers, and the period ranges from minutes to hours. In continuously stratified seawater, the density gradients produced by cold water, hot water or fresh water, and salt water are usually relatively small, but it is precisely because of this small density gradient that the vertical movement of seawater particles at the layered interface is required. The disturbance is very small. To put it simply, the disturbance of the ship's driving may form internal waves in the sea area where the seawater density is stratified. It is also because the disturbance required to form internal waves is very small, and the amplitude of internal waves is usually much larger than that of surface waves, generally ranging from a few meters to hundreds of meters. The largest internal wave amplitude observed so far is 180m. The vertical movement of seawater caused by internal waves is crucial to the energy transport in the ocean. It can transfer the energy from the upper layer of the ocean to the deep layer, and bring the colder seawater in the deep layer together with nutrients to the warmer shallow layer, promoting marine life. of multiplying. Internal waves cause fluctuations in the iso-density surface of seawater, which affects the size and direction uniformity of sound velocity, and has a great impact on sonar, which is beneficial to the concealment of submarines underwater. Internal waves also have their harmful side. Internal waves, like surface waves, can have an impact on offshore installations. Internal waves also have a significant impact on ship navigation and submarine navigation. Especially internal solitary waves, whose wavelengths range from tens of kilometers to hundreds of kilometers, have strong nonlinear characteristics, change periods of several hours, and spatial scales ranging from hundreds of meters to several kilometers. Internal solitary waves are usually formed due to the impact of seabed topography encountered during internal tide advancement, and such fluctuations are very harmful to underwater vehicles. When a submarine encounters an internal solitary wave, the strong velocity field and pressure field of the internal wave will drag the submarine to deep water, and the huge water pressure will destroy the structure of the submarine body and make it broken; when the submarine crosses the crest of the internal solitary wave, the extremely strong Steering forces may also cause structural fractures in the submarine.

At present, there are few studies on the motion form of submarines in internal solitary waves at home and abroad, and most of the existing studies are theoretical calculation studies. For example, some scholars have studied the interaction between periodic internal waves and submerged bodies, and concluded that at the same submerged depth, the submersible model will increase with the increase of the internal wave period and amplitude when the submersible model is subjected to internal waves in the horizontal and vertical directions. , the submersible model is subjected to the largest internal wave force at the pyrocline, and under periodic internal wave excitation, the submersible model has theoretical results such as frequency doubling and other nonlinear dynamic response phenomena. In the research on the coupled movement of the submerged body with the internal wave, it is found that the motion response of the submerged body exhibits wave frequency characteristics and slowly changing drift. In addition, a model test was done on the coupling motion of the submersible under the action of internal solitary waves. The experimental device fixed the submersible model in the internal wave tank with a semi-flexible rope.

However, the research done in the prior art cannot accurately obtain the experimental data for the theoretical research on the coupling motion of the submerged body under the action of internal solitary waves, thereby reducing the accuracy; and, in the experimental equipment of the prior art, due to the flexible rope The fixed and elastic force of the submersible body will largely show a circular motion with the fixed point as the center and the length of the flexible rope as the radius, which will lead to the submersible motion under the action of the experimental state and the actual internal solitary wave The format does not match, reducing the accuracy of the experiment.

Contents of the invention

The embodiment of the present invention provides an experimental system for the interaction between the internal wave and the submerged body, which solves the problem of low accuracy of the experimental system for the interaction between the internal wave and the submerged body in the prior art.

The experimental system for the interaction between the internal wave and the submarine body provided by the present invention includes: a submarine body model, a motion simulation component, a motion recording component and an experiment tank, the submersible body model includes a submersible body shell and a first counterweight, and the The first counterweight is placed in the shell of the submersible; the motion simulation assembly includes X-guiding rails, Y-guiding rails, Z-guiding rails, spherical hinge universal joints, connecting rods and sliders. The X-guiding rail is erected horizontally over the experimental slot, the Y-guiding rail is slidably arranged on the X-guiding rail, and is perpendicular to the Y-guiding rail, and the slider is slidably arranged on the Y-guiding rail , the submerged body model is connected to one end of the connecting rod through the spherical hinge universal coupling, and the other end of the connecting rod passes through the through hole of the slider; the motion recording assembly includes three A directional electronic gyroscope, a first sensor, a second sensor, a third pressure sensor and a display screen, the three-directional electronic gyroscope is arranged in the submerged body model, the first sensor, the second sensor and the The third pressure sensor is respectively arranged at the top, the middle of the bottom and the middle of the side wall of the submersible model, and the display screen is connected with the three-way electronic gyroscope, the first sensor, the second sensor and the The third pressure sensor is electrically connected.

To sum up, the experimental system for the interaction between the internal wave and the submersible body provided by the embodiment of the present invention, by setting up the submersible body model, motion simulation components, motion recording components and experimental tanks, makes the connection between the submersible body and the connecting rod through a spherical hinge universal Couplings, electronic gyroscopes are installed in the submerged body, pressure sensors are respectively installed in the top, middle of the bottom surface and side wall of the submerged body, and display screens are installed, so that the submerged body can be coupled with the flow field of the internal solitary wave Movement, using the connection of the spherical hinge universal coupling, so that the submersible can rotate in three directions relative to the connecting rod, and use the three-way electronic gyroscope to record the angular velocity of the submersible in the X, Y, and Z directions in real time , simultaneously record the acceleration of the submerged body in the X, Y, and Z directions, and use three pressure sensors to record the wave force of the submerged body model and the X, Y, and Z directions on the connecting rod during the traveling process of the internal solitary wave , and then transmit the recorded results to the display through the wire, display the force measurement data in real time, and record them in the data file.

Description of drawings

Fig. 1 is a schematic structural diagram of an experimental system for the interaction between an internal wave and a submerged body provided by an embodiment of the present invention.

Fig. 2 is the structural representation of the submerged body model of the experimental system of the interaction between internal wave and submerged body provided by the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an experimental system for the interaction between an internal wave and a submerged body provided in another embodiment of the present invention;

Fig. 4 is a top view structural diagram of an experimental system for the interaction between an internal wave and a submerged body provided by another embodiment of the present invention.

Explanation of reference signs:

100-submarine model, 101-shell, 102-the first counterweight, 201-X guide rail, 202-Y guide rail, 203-spherical hinge universal coupling, 204-link rod, 205-slip Block, 206-connecting line, 207-second counterweight, 301-three-way electronic gyroscope, 302-first sensor, 303-second sensor, 304-fourth sensor, 400-experimental tank, 500-motor, 501 - Traction line.

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

An experimental system for the interaction between an internal wave and a submerged body provided by an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 4 . Fig. 1 is the structural schematic diagram of the experimental system of internal wave and submerged body interaction that the embodiment of the present invention provides, as shown in the figure, this system can comprise:

Submersible body model 100, motion simulation component and motion recording component, described submersible body model 100 comprises submersible body shell 101 and first counterweight 102, and described first counterweight 102 is placed in described submersible body shell 101; The motion simulation assembly includes an X-guiding rail 201, a Y-guiding rail 202, a spherical hinge universal joint 203, a connecting rod 204, and a slide block 205, and the X-guiding rail 201 is erected horizontally over the experimental tank 400, The Y guide rail 202 is slidably arranged on the X guide rail 201 and is perpendicular to the Y guide rail 202, the slider 205 is slidably arranged on the Y guide rail 202, and the submerged body model 100 is connected to one end of the connecting rod 204 through the spherical hinge universal coupling 203, and the other end of the connecting rod 204 passes through the through hole of the slider 205; the motion recording assembly includes a three-way An electronic gyroscope 301, a first sensor 302, a second sensor 303, a third pressure sensor 304 and a display screen, the three-way electronic gyroscope 301 is arranged in the submerged body model 100, the first sensor 302, the The second sensor 303 and the third pressure sensor 304 are respectively arranged at the top, the middle of the bottom and the middle of the side wall of the submersible model 100, and the display screen is connected with the three-way electronic gyroscope 301 and the first A sensor 302, the second sensor 303 and the third pressure sensor 304 are electrically connected.

Specifically, the embodiment of the present invention provides an experimental system for the interaction between an internal wave and a submersible. The experimental system may include a submersible model 100 , a motion simulation component, a motion recording component, and an experimental tank 400 . The experimental tank 400 can be a cuboid structure, and multiple layers of media with different densities can be arranged inside, so as to most realistically simulate internal solitary waves in the ocean. For example, in an actual experiment, salt water can be set in the bottom layer of the experimental tank 400, and fresh water can be set in the upper layer.

The submersible model 100 may include a simulated shell 101 . And in order to ensure that the gravity and buoyancy in the natural state of the submersible in the internal wave experiment tank are kept in balance, a counterweight, that is, the first counterweight 102 can be arranged in the shell 101 .

Motion simulation components can include three-way guides and connectors. The three-way guide can include displacement guides in three directions of X, Y, and Z. The guide rails in the X and Y directions can be installed horizontally on the test tank 400 . Concretely, the two ends of the guide rail in the X direction can be fixed on the side wall of the experimental tank 400, and the two ends of the guide rail in the Y direction can be slidably arranged on the guide rail in the X direction, so that the guide rail in the Y direction can be slid in the direction of the X direction. Slide on the rail. For example, a groove can be provided on the top of the guide rail in the X direction, and a pulley can be provided on the bottom of the Y guide rail, so that the sliding of the Y guide rail on the X guide rail can be realized by using the pulley and the groove. The connecting part may include a spherical joint universal joint 203 , a connecting rod 204 and a sliding block 205 . In practice, the slider 205 is slidably arranged on the guide rail in the Y direction, and can slide back and forth on the guide rail in the Y direction. It should be understood that the same arrangement of grooves and pulleys can be used to realize the sliding of the slider 205 on the Y guide rail. Further, through holes are provided on the slider 205 and the Y guide rail. Thereby, the top end of the connecting rod 204 can pass through the through hole on the Y guide rail and the sliding block 205 sequentially. Moreover, the submersible model 100 can be connected with the bottom end of the connecting rod 204 through a spherical hinge universal joint 203 . Through the above connections, the simulation of the roll, pitch, and yaw of the submarine model can be realized, and the free movement of the submarine in the Z direction can be realized. It should be understood that the connecting rod 204 serves as the Z guide rail of the system. In addition, due to the setting of the slider, that is, the slider can move freely on the Y-direction rail, and the Y-direction rail can move freely on the X-direction rail, thus realizing the displacement of the submersible model in the X, Y, and Z directions simulation.

Further, in order to make the connecting rod more stably clamped in the slider, avoid the shaking of the connecting rod, and thus make the movement state of the submersible model in the Z direction more stable, the sleeve can be fixed above the through hole of the slider , so that the link rod is in the sleeve.

In order to realize data recording of the submersible body model 100 during the action of external force, the motion recording component of the system may include a three-way electronic gyroscope, three pressure sensors and a display screen. The three-way electronic gyroscope is arranged in the submersible body model 100, and the three pressure sensors are located at the middle part of the front end of the submersible body, the central position of the bottom surface of the submersible body, and the central position of the side surface of the submerged body, and the display screen is connected to the three-way electronic gyroscope and Three pressure sensors are electrically coupled. The angular velocity module of the three-way electronic gyroscope can be used to measure the swing angle of the submersible model in three directions, and the linear velocity module can record the displacement of the submersible in three directions; the three pressure sensors and the submersible vector are used to record the internal Wave changes in three directions caused by solitary waves. The data display can display in real time the submersible coupling motion data and pressure data recorded by the above recording instruments.

Preferably, in another embodiment of the experimental system for the interaction between the internal wave and the submerged body provided by the present invention, in order to use the system to simulate the force situation of the submerged body under the action of the internal solitary wave in the static state, the X The guide rail 201 is provided with a plurality of fixing clips for fixing the Y guide rail 202 , and the connecting rod 204 is provided with a plurality of fixing clips for fixing the connecting rod 204 and the slider 205 . Therefore, the above-mentioned plurality of fixing clips can be used to stably fix the moving assembly at a certain position in the experimental tank.

Preferably, as shown in FIG. 3 , in another embodiment of the experimental system for the interaction between the internal wave and the submarine provided by the present invention, in order to be able to simulate the coupling motion of the submarine model 100 when it encounters an internal solitary wave during a constant speed voyage, The system also includes a motor 500 . That is, a motor can be arranged at the end of the X-guiding rail, and the rotating shaft of the motor can be connected with the Y-guiding rail through a traction line. Therefore, when the motor rotates at a constant speed, the Y guide rail and the submersible model can be pulled by the traction line to move at a constant speed along the X direction.

Preferably, in another embodiment of the experimental system for the interaction between the internal wave and the submerged body provided by the present invention, in order to balance the gravity of the equipment, two counterweights can be equipped between the slider and the connecting rod to balance the connecting rod gravity. That is, brackets can be provided at both ends of the Y guide rail 202 , and connecting wires 206 can be arranged on the brackets, so that a second counterweight 207 can be hung on the ends of the two connecting wires 206 . Optionally, in order to achieve the best balance of the gravity of the equipment, the other end of the connecting wire can be extended into the experimental groove and fixed on the connecting rod.

In actual experiments, for example, two layers of media with different densities are contained in the experimental tank, and in order to simulate internal solitary waves in the ocean, the upper layer 1 is generally fresh water, and the lower layer 2 is salt water. The experimental devices are combined into a whole and placed above the experimental tank. First, the Y-direction guide rail is fixed on the X-direction guide rail with a fixed clip under the Y-direction guide rail, and the submersible body model is immersed in water. Then increase or decrease the counterweight according to the floating or diving characteristics of the submersible model until the submersible is suspended to the specified depth in the liquid.

At the beginning of the experiment, the internal solitary wave in the experimental tank was obtained by the gravity collapse method. When the internal solitary wave propagates to the submerged body, it will cause large changes in the velocity field and density field, and the submerged body performs coupling motion with the flow field of the internal solitary wave. Since the submerged body is connected to the vertical connecting rod in the Z direction, and the upper part of the connecting rod passes through the corresponding through hole in the slider, that is, the movement of the submerged body in the Z direction depends entirely on the force exerted by the internal solitary wave on the submerged body. Under the action of internal solitary waves, the submersible may also move along the X and Y directions. When the submersible moves along these two directions, the submersible and the connecting rod will drive the slider to move on the X and Y guide rails. It should be understood that in order to minimize the influence of the slider on the movement form of the submersible, the slider, that is, the slide rail, is made of light materials to minimize errors.

It should also be understood that the submerged body under the action of internal solitary waves will also produce rotations in the X, Y, and Z directions. Since the submerged body is connected with the vertical connecting rod through a spherical hinge universal coupling, it can be three-way relative to the connecting rod. rotation in one direction. The rotation in the Z direction can realize 360-degree simulation, and the rotation in the X and Y directions can realize the rotation simulation close to 180 degrees.

The coupled motion form of the submerged body under the action of internal solitary waves is recorded by a three-way electronic gyroscope. Since the three-way electronic gyroscope is installed at the center of the inner bottom surface of the submersible model, it can record the angular velocity of the submersible in the X, Y and Z directions in real time, and simultaneously record the acceleration of the submersible in the X, Y and Z directions. The three-way electronic gyroscope is equipped with a wireless module, and through a wireless connection, the data is output on the data display in real time and recorded in the data file.

In addition, when carrying out the force experiment of the submerged body under the action of internal solitary waves, it can be recorded by the pressure sensor. Specifically, before the measurement, three pressure sensors are fixed at the center of the front end of the submersible, the center of the bottom of the submersible and the center of the left side of the submersible. Then, the pressure sensor records the wave force of the internal solitary wave in the three directions of X, Y, and Z on the submersible model during the progress of the internal solitary wave. The pressure sensor is connected to the monitor through a wire, and the force measurement data is displayed in real time and recorded in the data file.

It should be understood that the experimental system setup for the interaction between the internal wave and the submerged body provided in the embodiments of the present invention can also be used for coupling motion simulation of other underwater vehicles, and there is no limitation thereto.

To sum up, the experimental system for the interaction between the internal wave and the submersible body provided by the embodiment of the present invention, by setting the submersible body model, motion simulation components, motion recording components and experimental grooves, makes the connection between the submersible body and the connecting rod pass through a spherical hinge. Type universal coupling, and electronic gyroscopes are set in the submerged body, pressure sensors are respectively set in the top of the submerged body, the middle of the bottom surface and the middle of the side wall, and a display screen is set, so that the submerged body can follow the flow field of the internal solitary wave Carry out coupling movement, use the connection of the spherical hinge universal coupling, so that the submersible can rotate in three directions relative to the connecting rod, and use the three-way electronic gyroscope to record the rotation of the submersible in the X, Y, and Z directions in real time At the same time, the acceleration in the X, Y, and Z directions of the submerged body is recorded, and three pressure sensors are used to record the internal solitary waves in the submerged body model and the X, Y, and Z directions on the connecting rod during the traveling process of the internal solitary wave. Wave force, and then the recorded results are transmitted to the display through the wire, and the force measurement data is displayed in real time and recorded in the data file.

The above disclosures are only a few specific embodiments of the present invention, however, the embodiments of the present invention are not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (5)

1. a kind of experimental system that internal wave interacts with submerged body is characterized in that, comprises: submerged body model (100), motion simulation assembly, motion recording assembly and experiment tank (400), described submerged body model (100) ) includes a submersible body shell (101) and a first counterweight (102), and the first counterweight (102) is placed in the submersible body shell (101); the motion simulation assembly includes an X guide rail ( 201), Y guide rail (202), spherical hinge universal joint (203), connecting rod (204) and slide block (205), described X guide rail (201) is horizontally erected in the experimental groove ( 400), the Y guide rail (202) is slidably arranged on the X guide rail (201), and is perpendicular to the Y guide rail (202), and the slider (205) is slidably arranged on the On the Y guide rail (202), the submerged body model (100) is connected to one end of the connecting rod (204) through the spherical hinge universal joint (203), and the connecting rod (204 ) passes through the through holes of the Y guide rail (202) and the slider (205) in turn; the motion recording assembly includes a three-way electronic gyroscope (301), a first sensor (302), a second Two sensors (303), a third pressure sensor (304) and a display screen, the three-way electronic gyroscope (301) is arranged in the submersible model (100), the first sensor (302), the The second sensor (303) and the third pressure sensor (304) are respectively arranged at the top, the middle of the bottom and the middle of the side wall of the submersible model (100), and the display screen is connected with the three-way electronic gyroscope respectively. (301), the first sensor (302), the second sensor (303) and the third pressure sensor (304) are electrically coupled. 2. The experimental system for the interaction between internal wave and submerged body according to claim 1, characterized in that, the X-guiding rail (201) is provided with a plurality of clamps for fixing the Y-guiding rail (202) , the connecting rod (204) is provided with a plurality of fixing clips for fixing the connecting rod (204) and the slider (205). 3. the experimental system of internal wave and submerged body interaction according to claim 1, is characterized in that, also comprises motor (500), and described motor is arranged on an end of described X guide rail (201), and described motor A traction line (501) is connected between the rotating shaft of the shaft and the Y guide rail (202). 4. The experimental system according to any one of claims 1-3, characterized in that the two ends of the Y-guiding rail (202) are provided with connecting wires (206), and the connecting A second counterweight (207) is hung from the top of the line (206). 5. The experimental system for the interaction between internal waves and submerged bodies according to any one of claims 1-3, characterized in that at least two media with different densities are arranged in the experimental tank (400).