Underwater equivalent experiment device for navigation body

Abstract

The utility model provides a navigation body effluent equivalent experiment device, which comprises a launching part and a testing part, the test part comprises a base, an inner cylinder and an outer cylinder, the lower surfaces of the inner cylinder and the outer cylinder are connected with the upper surface of the base, the inner cylinder and the outer cylinder are of cylindrical structures, the inner cylinder is arranged in the outer cylinder, the upper surface of the inner cylinder is lower than the upper surface of the outer cylinder, a sealing structure is arranged on the upper surface of the inner cylinder, and the sealing structure is arranged on the lower surface of the outer cylinder. Water is arranged in an interlayer between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and air is arranged in the inner cylinder; the launching part comprises a launching cylinder, a velometer and a navigation body. The influence of gravity is neglected when the water outlet problem is researched, the underwater vehicle water outlet equivalent experiment device with the launching device arranged on the upper portion is innovatively designed, the operability of the experiment is greatly improved, and the structure and the experiment process of the launching device are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of ships and marine engineering, and in particular to a navigation body out of water equivalent experimental device. Background Art

[0002] The stability of a vehicle is affected by many factors when it enters the air medium from the water medium. The wake generated by the vehicle in the water leads to the uncertainty of its trajectory, especially in the high-speed and long-distance movement process in the water. Due to the continuous effect of the wake, the pressure on the surface of the vehicle is unevenly distributed, and the vehicle is more likely to become unstable during the movement in the water, resulting in uncertainty in the trajectory after leaving the water. Since the physical properties of air and water are very different, the load of the vehicle will suddenly change during the process of leaving the water. Due to the existence of wind and waves, floating ice, complex structures and other conditions on the actual water surface, it is still difficult to establish a model that can accurately describe the movement of the vehicle. In extreme cases, the vehicle will collide with the surface structure.

[0003] There are relatively few experimental studies on the above-mentioned water-out problems, and the research results are mainly concentrated in the field of numerical calculation, such as using large-scale commercial finite element software ABAQUS and STARCCM+ for joint simulation to find factors that affect the stability of the navigation body. However, numerical methods are always obtained through calculations, and there are few experiments that can be compared with them, so their reliability is still controversial.

[0004] At present, due to problems such as venue, equipment and funding, it is still difficult to conduct a full-scale water-emerging experiment of a navigation body. Therefore, most of the existing devices adopt the idea of ​​scaling. Based on objective facts, a launching device is placed at the bottom of the water tank to conduct research on the water-emerging of the navigation body. However, this arrangement also has some problems. First, the launching device is placed underwater, and the arrangement of its supporting equipment is relatively complicated. The introduction of complex systems will inevitably lead to a decrease in the overall reliability of the device; secondly, the equipment placed underwater must be waterproof, and the waterproofing work must be carried out for each experiment, which reduces the efficiency of the experimental work in the long run; thirdly, each time the launching device is stimulated, its sealing will be destroyed, so the launching device must be disassembled frequently. The launching device is located in the water, and the operation is not convenient. This problem is more obvious when studying the long-stroke underwater motion of the navigation body; finally, it is easy to introduce errors artificially in the process of disassembling the device. Utility Model Content

[0005] According to the above, the existing water-outlet device for aircraft has the technical problem that the device must be waterproofed for each experiment, so a water-outlet equivalent experimental device for aircraft is provided. The utility model mainly provides an experimental device with two gas and liquid areas, thereby improving the efficiency of experimental work.

[0006] The technical means adopted by the utility model are as follows:

[0007] A navigation body out of water equivalent experimental device, comprising a launching part and a testing part;

[0008] The test part comprises a base, an inner cylinder and an outer cylinder, the lower surfaces of the inner cylinder and the outer cylinder are connected to the upper surface of the base, the inner cylinder and the outer cylinder are cylindrical structures, the inner cylinder is arranged inside the outer cylinder, the upper surface of the inner cylinder is lower than the upper surface of the outer cylinder, a sealing structure is arranged on the upper surface of the inner cylinder, water is arranged in the interlayer between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and air is arranged in the inner cylinder;

[0009] The launching unit comprises a launching tube, a speed meter and a navigation body, wherein the navigation body is mounted at the lower end of the launching tube, a speed meter is arranged below the launching tube, the lower end of the launching tube, the speed meter and the navigation body extend into an outer tube, the lower end of the launching tube, the speed meter and the navigation body are arranged above the inner tube, the lower end of the launching tube, the speed meter and the navigation body are arranged in water, and the upper end of the launching tube is arranged in the air.

[0010] Furthermore, the sealing structure is a sealing film or a sealing plate.

[0011] Furthermore, the base, inner tube and outer tube are an integrated structure.

[0012] Furthermore, the central axes of the outer cylinder and the inner cylinder are the same.

[0013] Furthermore, the sealing structure is connected to the inner cylinder through bolts and a sealing flange.

[0014] Furthermore, the material of the test part is glass or acrylic plate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The utility model adopts a double-cylinder structure to design an equivalent experimental device capable of studying the water-out problem of a navigation body. The traditional water-out experimental device has a complex structure, and the water-sealing operation of the launch tube is cumbersome, and the replacement of the navigation body is troublesome. Frequent water sealing of the underwater device and replacement of the navigation body are also prone to introduce errors in the human operation process. After water is injected into the experimental device, two gas-liquid regions can be formed. This experimental condition meets the situation when the navigation body is out of water, and can be effectively used for studying the water-out problem of the navigation body. The experimental device ignores the influence of gravity when studying the water-out problem, and innovatively designs a navigation body water-out equivalent experimental device placed on the launch tube, which greatly increases the operability of the experiment, simplifies the structure and experimental process of the launch tube, and the operation of the launch tube during the experiment only includes installing the navigation body and water-sealing the launch tube and the speed meter. Compared with the traditional water-out experimental device, there are fewer operating steps, and the position of the equivalent water outlet can be freely controlled. The error introduced by humans is smaller when performing repetitive experiments. The inner and outer tube arrangement design of the experimental device speeds up the experimental efficiency, and the flange on the top of the inner tube can be operated only by controlling the free liquid surface below the inner tube.

[0017] The utility model can be used to study a wide range of issues. By replacing the sealing film with a plate of the same diameter but different material or thickness, an equivalent penetration experiment of a navigation body out of water can be carried out. The device can control the position of penetration to remain unchanged, greatly enhancing the accuracy of the experimental research and is easy to operate. The device can also be used to study the problems of underwater penetration and navigation body entry into water.

[0018] The utility model belongs to the field of ship and ocean engineering. The device can be used to carry out scaled-down experiments of navigation bodies emerging from water, and can also be used to carry out scaled-down experiments of submarine penetration of different materials. The device can be used to carry out a series of water ballistics experimental studies. The research results can be applied to non-military projects such as underwater aircraft launch, underwater submarine icebreaking, etc., and can also be used in military fields such as underwater submarine weapon launch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the structure of the test part of the utility model.

[0022] Figure 3It is the front view of the test part of the utility model.

[0023] Figure 4 It is a top view of the test part of the utility model.

[0024] Figure 5 It is a schematic diagram of the utility model after water injection.

[0025] In the figure: 1. base; 2. inner tube; 3. outer tube; 4. sealing structure; 5. water; 6. air; 7. launching tube; 8. speed meter; 9. navigation body. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] like Figure 1-5 As shown, the utility model provides a navigation body out of water equivalent experimental device, including a launching part and a testing part;

[0033] The test part includes a base 1, an inner tube 2 and an outer tube 3, and the base 1, the inner tube 2 and the outer tube 3 are an integrated structure. The central axis of the outer tube 3 and the inner tube 2 is the same. The lower surfaces of the inner tube 2 and the outer tube 3 are connected to the upper surface of the base 1, and the inner tube 2 and the outer tube 3 are cylindrical structures. The inner tube 2 is arranged inside the outer tube 3, and the upper surface of the inner tube 2 is lower than the upper surface of the outer tube 3. A sealing structure 4 is arranged on the upper surface of the inner tube 2, and the sealing structure 4 is a sealing film or a sealing plate. The sealing structure 4 is connected to the inner tube 2 through bolts and a sealing flange. Water 5 is arranged in the interlayer between the inner wall of the outer tube 3 and the outer wall of the inner tube 2, and air 6 is arranged in the inner tube 2; the material of the test part is glass or acrylic plate.

[0034] The launching unit includes a launching tube 7, a speedometer 8 and a navigation body 9, and the navigation body 9 is a scaled model of the navigation body. The navigation body 9 is installed at the lower end of the launching tube 7, and the speedometer 8 is arranged below the launching tube 7. The lower end of the launching tube 7, the speedometer 8 and the navigation body 9 extend into the outer tube 3, and the lower end of the launching tube 7, the speedometer 8 and the navigation body 9 are arranged above the inner tube 2. The lower end of the launching tube 7, the speedometer 8 and the navigation body 9 are arranged in the water 5, and the upper end of the launching tube 7 is arranged in the air 6.

[0035] Since the mass of the scaled experimental vehicle is very small and the water exit process takes only a few milliseconds, the effect of gravity on the water exit process is very weak and can be ignored. When the vehicle in the utility model penetrates the film at a high speed, the resistance of the film will be very weak, so the sealing film will not affect the experiment.

[0036] The utility model also provides a navigation body out of water equivalent test method, which is implemented based on the navigation body out of water equivalent test device, including out of water equivalent test, out of water equivalent penetration test, water entry test, and underwater penetration test;

[0037] 1. Water equivalence test;

[0038] Experimental device layout: Place the device in the experimental field and stick a grid paper with known grid size behind the device to facilitate the measurement of the motion trajectory of the vehicle;

[0039] Launch system layout: Place the launch unit in the air directly above the device, seal the launch tube 7 head and the speed meter 8, and place the launch tube mouth directly at the center of the inner tube 2. The speed meter 8 is used to measure the speed of the navigation body 9 at the moment it leaves the tube;

[0040] Construct water discharge experimental conditions: inject a small amount of water into the inner cylinder 2 and then use the sealing flange to install the isolation film on the top of the inner cylinder 2 to isolate the media in the inner and outer cylinders;

[0041] Sealing check: Pour water into the experimental device. When the free liquid level of the outer tube 3 is 5 cm higher than the top of the inner tube 2, stop pouring water. Wait for 1 minute to observe whether there is obvious leakage (more than 30 drops per minute is considered to have obvious leakage, which will affect the experiment). If there is leakage, use a water pump to drain the excess water in the device until the free liquid level in the outer tube 3 is slightly lower than the top of the inner tube 2. Stop draining, re-use the sealing flange to install the isolation film, and use sealing tape to assist in sealing when necessary. Repeat the leakage check until it meets the requirements and continue to pour water into the device until the water depth meets the experimental conditions to be conducted. During the water exit experiment, the head of the launch tube 7 and the speed meter 8 are both underwater.

[0042] Conduct the experiment: install the scaled model of the navigation body 9 into the launching tube 7, use a high-speed camera to record the experimental process, stimulate the launching tube 7, the navigation body 9 in the launching tube 7 is pushed, and the navigation body 7 continues to move forward after passing the speed meter 8, and stops after hitting the base 1 after penetrating the adjacent film. After the equivalent water-out experiment of the navigation body is completed, save the high-speed camera video as soon as possible, and then turn off the launching device to prevent danger during the subsequent replacement of the navigation body.

[0043] Replace the vehicle: After the isolation film is punctured, the isolation effect of the inner tube and the outer tube disappears. After saving the high-definition video, use a water pump to control the free liquid surface in the device to below the inner tube, remove the sealing flange and the isolation film, if the water entering the inner tube exceeds 1 / 5 of the volume of the inner tube, use a water pump to drain the water in the inner tube, if it does not exceed 1 / 5 of the volume, continue the experiment (the presence of a small amount of water at the bottom will not affect the experimental results and can also reduce the impact between the vehicle and the base), use the sealing flange to install a new isolation film, and then perform the operations as described above until the water depth is the same as that of the previous experiment, then repeat the equivalent experiment of the vehicle emerging from water, and the shape, material, and launch speed of the vehicle during the experiment can be changed.

[0044] 2. Water equivalent penetration test;

[0045] The device can also be used to study the problem of water penetration of navigation bodies. The experimental process is consistent with the water test process, except that the penetration plate is used instead of the sealing flange. The plate plays the role of sealing and penetration in the experiment. During the experiment, the head of the launch tube 7 and the speed meter 8 are both underwater, and the material and thickness of the penetration plate can be changed.

[0046] 3. Water penetration test;

[0047] The device can be used for underwater penetration experiments. The experimental process is as follows

[0048] Experimental device layout: Place the device in the experimental field and stick a grid paper with known grid size behind the device to facilitate the measurement of the motion trajectory of the vehicle;

[0049] Launch system layout: Place the launch unit in the air directly above the device, seal the launch tube 7 head and the speed meter 8, and place the launch tube mouth directly at the center of the inner tube 2. The speed meter 8 is used to measure the speed of the navigation body at the moment it leaves the tube.

[0050] Construct the underwater penetration test conditions: inject water into the inner tube 2, stop injecting water when the inner tube 2 is full of water, use the sealing flange to install the penetration plate to the top of the inner tube, and then continue to inject water into the outer tube 1 until the water depth meets the experimental conditions. During the experiment, the head of the launch tube 7 and the speed meter 8 are located underwater.

[0051] Conduct the experiment: install the scaled model of the vehicle 9 into the launch tube, use a high-definition camera to record the experimental process, activate the launch device, save the high-definition camera video as soon as possible after the experiment, and then turn off the launch device.

[0052] Replace the penetrated plate: Use a water pump to control the free liquid level in the device to below the inner tube 2, remove the sealing flange and the used penetrated plate, add a small amount of water into the inner tube 2 and install a new penetrated plate, and then continue to add water into the outer tube 1 until the water depth meets the experimental requirements. Repeatable experiments can be carried out. During the experiment, the material and thickness of the plate can be changed.

[0053] 4. Water entry test of the navigation body;

[0054] The experimental process is basically the same as the underwater penetration experiment. The head of the launch tube 7 and the speed meter 8 do not need water sealing operation. The two devices are always located in the air during the experiment. There is no need to install a sealing flange during the experiment. Water can be directly injected into the device until the experimental conditions are met. There is no need to use a water pump to frequently control the water surface during the experiment. After the experimental device is built, the operation of the launch device is only to replace the navigation body.

[0055] Although the arrangement method of the water-outlet equivalent experiment in the utility model is similar to that of the water-entry experiment, there is an essential difference between the two. In the water-entry experiment, the launching tube and the speed meter are located in the air, and the navigation body is shot into the water from the air after being launched, while the water-outlet equivalent experiment is to construct the water-outlet experimental conditions through the experimental device, at this time, part of the launching tube and the speed meter are located in the water, and the navigation body is shot into the air after penetrating the sealing film from the water after being launched.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A navigation body out of water equivalent experimental device, characterized by: It includes the launch section and the test section; The test section comprises a base (1), an inner tube (2) and an outer tube (3), the lower surfaces of the inner tube (2) and the outer tube (3) are connected to the upper surface of the base (1), the inner tube (2) and the outer tube (3) are cylindrical structures, the inner tube (2) is arranged inside the outer tube (3), the upper surface of the inner tube (2) is lower than the upper surface of the outer tube (3), a sealing structure (4) is arranged on the upper surface of the inner tube (2), water (5) is arranged in the interlayer between the inner wall of the outer tube (3) and the outer wall of the inner tube (2), and air (6) is arranged in the inner tube (2); The launching unit comprises a launching tube (7), a speed meter (8) and a navigation body (9); the navigation body (9) is mounted on the lower end of the launching tube (7); a speed meter (8) is arranged below the launching tube (7); the lower end of the launching tube (7), the speed meter (8) and the navigation body (9) extend into an outer tube (3); the lower end of the launching tube (7), the speed meter (8) and the navigation body (9) are arranged above the inner tube (2); the lower end of the launching tube (7), the speed meter (8) and the navigation body (9) are arranged in water (5); and the upper end of the launching tube (7) is arranged in air (6).

2. The equivalent experimental device for a navigation body emerging from water according to claim 1 is characterized in that: The sealing structure (4) is a sealing film or a sealing plate.

3. The equivalent experimental device for a navigation body emerging from water according to claim 1 is characterized in that: The base (1), the inner cylinder (2) and the outer cylinder (3) are an integrated structure.

4. The equivalent experimental device for a navigation body emerging from water according to claim 1 is characterized in that: The central axes of the outer cylinder (3) and the inner cylinder (2) are the same.

5. The equivalent experimental device for a navigation body emerging from water according to claim 1 is characterized in that: The sealing structure (4) is connected to the inner cylinder (2) via bolts and a sealing flange.

6. The equivalent experimental device for a navigation body emerging from water according to claim 3 is characterized in that: The material of the test part is glass or acrylic plate.

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