Device and method for measuring internal pressure of tail bubble of underwater vehicle

Abstract

The invention provides a device and a method for measuring the internal pressure of a tail bubble of an underwater navigation body, and belongs to the technical field of ocean engineering tests. The problems that in an existing navigation body water outlet test, the local wall surface pressure of the surface of a model is mostly measured, and the pressure change of a gas-liquid mixed phase in a bubble cannot be accurately measured due to jet disturbance of the obtained pressure are solved. The device comprises a navigation body model assembly, a driving guide assembly, a locking assembly, a probe sensor, a probe sensor motion sealing assembly and a pressure data acquisition system, wherein the navigation body model assembly, the driving guide assembly, the locking assembly and the motion sealing assembly are mounted at the tail part of a navigation body. When the navigation body is ejected out of the cylinder, the spring and the mass sliding block are connected, and the probe sensor extends out of the bottom of the navigation body into a tail cavitation bubble of the appendage to measure the pressure in the bubble. After the sailing body comes out of water and touches the blocking net, the probe sensor automatically retracts and is locked by the limiting ball. The device is mainly applied to the internal pressure measurement test of the tail cavitation bubble when the navigation body is catapulted.

Description

Technical Field

[0001] The invention belongs to the technical field of scaled model tests of underwater vehicle exiting water, and particularly relates to a device and a method for measuring the pressure inside the cavitation bubble at the tail of an underwater vehicle. Background Technique

[0002] After the underwater vehicle exits the launch tube, the gas in the launch tube follows the tail to form a cavitation bubble at the tail. The cavitation bubble at the tail is a key factor determining the force and motion characteristics of the underwater vehicle. Its internal pressure directly affects the underwater motion state of the vehicle. At the same time, its development and evolution will have a significant impact on the hydrodynamic load and multi-degree-of-freedom motion of the vehicle. In addition, the complex flow characteristics of the cavitation bubble at the tail of the underwater vehicle lead to a complex force environment formed at the tail of the vehicle, which is the main reason for the structural damage of the equipment at the tail of the vehicle and the ballistic instability. Therefore, carrying out research on the flow mechanism and evolution law of the cavitation bubble at the tail is an important means to explore the motion load boundary of the underwater vehicle exiting water, and has important engineering significance for the hydrodynamic design and equipment development of the underwater vehicle.

[0003] Under the existing research background and technical level, various types of research experiments on the cavitation bubble at the tail of the vehicle appendage have been carried out, which have played a very good promoting role in the technical expansion research of the underwater vehicle exiting water. However, in this field, the local wall pressure is mostly measured through the surface of the vehicle. Due to the pressure disturbance caused by the impact of the backflow, mixed fluid, etc., there is a difference from the pressure inside the bubble that dominates the unsteady pulsation of the bubble. It does not yet have the ability to measure the internal pressure of the cavitation bubble at the tail of the vehicle appendage exiting water, and there is a lack of a measuring device that can quantitatively capture the dynamic evolution process of the pressure inside the bubble.

[0004] The probe sensor has the characteristics of a small overall diameter and a long detection distance, and can measure the pressure inside the bubble without affecting the evolution characteristics of the cavitation bubble flow field. However, this type of sensor is easily damaged. If it is directly installed at the bottom of the vehicle, it will affect the initial state of the vehicle in the launch tube, and when it is ejected from the tube by high-pressure gas or falls into the water after intercepting the water exit, it is very likely that the probe sensor will break, resulting in the failure of the experiment. Therefore, it is necessary to design a device for measuring the pressure inside the cavitation bubble at the tail of the vehicle, in which the probe sensor can be freely telescoped and has the functions of driving out and recovering and locking. Summary of the Invention

[0005] In view of this, in order to solve the problem that in the existing underwater vehicle water exit test, the local wall pressure on the surface of the model is mostly measured, and the obtained pressure has jet disturbance and cannot accurately measure the change of the pressure of the gas-liquid mixing phase inside the bubble, the invention proposes a device and a method for measuring the pressure inside the cavitation bubble at the tail of an underwater vehicle.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An underwater vehicle tail cavity bubble internal pressure measuring device, comprising a vehicle model assembly, a driving and guiding assembly, a locking assembly, a probe sensor, a probe sensor movement sealing assembly, and a pressure data acquisition system;

[0007] The driving and guiding assembly is installed inside the vehicle model assembly, connected to the probe sensor, and cooperates with the locking assembly to drive the probe sensor to make a reciprocating smooth movement along the axis of the vehicle model assembly. The probe sensor is installed at the bottom of the vehicle model assembly through the probe sensor movement sealing assembly. When the vehicle is ejected from the tube, the spring is connected to the mass slider, and the probe sensor protrudes from the bottom of the vehicle into the appendage tail cavity to measure the internal pressure of the cavity; after the vehicle touches the arresting net when leaving the water, the probe sensor automatically retracts and is locked by the limit ball.

[0008] Furthermore, the vehicle model assembly includes a vehicle head, an upper vehicle cabin section, a lower vehicle cabin section, a vehicle tail main body, and a vehicle bottom plate connected in sequence.

[0009] Furthermore, the driving and guiding assembly includes a mass slider, a spring, and a slide rail. The mass slider is installed inside the vehicle model assembly through a spring support. The probe sensor is installed below the spring support, and a spring is installed on the outer periphery of the probe sensor. The inner wall of the vehicle tail main body is installed with a slide rail, and the mass slider moves along the slide rail.

[0010] Furthermore, a spring mounting seat is opened on each side of the inner wall surface of the vehicle tail main body, symmetrically distributed at 180°. The locking assembly is installed on the limit ball chutes on both sides of the mass slider. The slide rail is located on the other two sides of the inner wall surface of the vehicle tail main body, at a 90° angle to a single spring mounting seat, and is cooperatively installed on the slide rail chutes on the other two sides of the mass slider. The mass slider is placed inside the vehicle tail main body along the slide rail.

[0011] Furthermore, the locking assembly includes a spring buckle, a small spring, and a limit ball. The cylindrical surface of the limit ball is installed inside the small spring. One end of the small spring is connected to the inner end face of the vehicle tail main body, and the other end is connected to the limit ball and squeezes the spherical surface to the limit ball chute; the spherical diameter of the limit ball is larger than the diameter of the small spring, and the inner diameter of the small spring is larger than the cylindrical surface diameter of the limit ball; the spring buckle is connected to the spring mounting seat at the vehicle tail, restricting the smooth movement of the small spring and the limit ball along the spring central axis.

[0012] Furthermore, the probe sensor moving seal assembly includes a sealing buckle, a small sealing ring and a large sealing ring. The small sealing ring is installed between the small sealing groove on the bottom plate of the vehicle body and the sealing groove of the sealing buckle. Six threaded holes are evenly distributed at the bottom of the main body of the vehicle body tail, and six countersunk bolt holes are evenly distributed on the bottom plate of the vehicle body. The main body of the vehicle body tail is fixedly connected to the bottom plate of the vehicle body through bolts. A large sealing groove is provided on the bottom surface of the main body of the vehicle body tail, and the large sealing ring is fixedly pressed against the plane on the bottom plate of the vehicle body to prevent water from the threaded holes and bolt holes from entering the interior of the vehicle body model assembly.

[0013] Furthermore, the pressure data acquisition system is an integrated built-in test data acquisition system. During the test, the data line connection buckle and the probe sensor are connected through a signal line to transmit and store data in real time. After a single-shot test is completed, only the head of the vehicle body can be disassembled, the data reading quick-connect socket is connected to the computer to complete data reading, and the data acquisition system is reactivated to start the next shot test.

[0014] Furthermore, the centroid of the pressure data acquisition system is located on its axis. When conducting tests under different working conditions, the position is adjusted in the upper cabin section and the lower cabin section of the vehicle body through threaded rods according to geometric and physical parameters such as the mass and centroid of the prototype, and auxiliary adjustment can be carried out by adding counterweight blocks.

[0015] A measurement method for a pressure measurement device in the tail air bubble of an underwater vehicle body specifically includes the following steps:

[0016] S1: Install the pressure data acquisition system on the threaded rod and adjust the centroid position. Then install one side of the data reading quick-connect socket on the upper cabin section of the vehicle body. One end of the threaded rod passes through the first mounting hole and is fixed on the first mounting platform by a locking nut.

[0017] S2: Pass the other end of the threaded rod through the second mounting hole of the lower cabin section of the vehicle body. The second connection sub-port of the lower cabin section of the vehicle body is docked with the first connection sub-port of the upper cabin section of the vehicle body, and the threaded rod is tightened by a locking nut to fix the two cabin sections.

[0018] S3: Connect the signal line of the probe sensor to the data line connection buckle. Then connect the main body of the vehicle body tail with the drive guiding assembly, the locking assembly and the probe sensor moving sealing mechanism installed through the second threaded connection sub-port, and finally install and fix the head of the vehicle body through the first threaded connection sub-port.

[0019] S4: When the vehicle body model assembly is installed in the launch tube and is in a static state, the gravity of the mass slider, the spring socket and the probe sensor is in static equilibrium with the elastic force of the spring and the friction force of the small sealing ring, and the limit ball is located above the limit ball locking groove.

[0020] S5: When the vehicle model assembly is launched, the mass slider and the spring holder are driven by inertia to continuously squeeze the spring, and the probe sensor moves vertically downward and extends relative to the bottom plate of the vehicle to measure the pressure in the tail bubble and transmit the signal to the pressure data acquisition system.

[0021] Furthermore, after the navigation body model assembly emerges from the water, it is intercepted by the blocking net above the water surface, and the mass slider and the spring seat move vertically upward relative to each other due to inertia. The limiting ball slides over the limiting ball slide groove into the limiting ball lock groove and is locked by the squeezing of the small spring. At this time, the probe sensor is located inside the tail of the navigation body to avoid damage to the probe sensor when falling into the water.

[0022] Compared with the prior art, the device and method for measuring the pressure inside the tail bubble of an underwater vehicle described in the present invention have the following beneficial effects:

[0023] 1. The present invention can effectively measure the pressure inside the tail cavitation bubble of the waterborne vehicle, which can further assist in the study of the flow mechanism and evolution law of the tail cavitation bubble, and realize the exploration of the motion load boundary of the waterborne vehicle. The probe can be adjusted to the position inside the bubble. By conducting repetitive experiments, the distribution of the pressure inside the bubble at different positions inside the bubble can be captured, thereby effectively studying the multi-order pulsation of the bubble wall and the flow instability caused by its interaction with the incoming fluid.

[0024] 2. The pressure measuring component inside the tail cavity of the present invention, namely the probe sensor, can be freely extended and retracted, and has the function of driving to extend and retract and lock, which can effectively avoid the bending and damage of the probe sensor caused by unnecessary external load factors when the navigation body is ejected from the tube or intercepted into the water during the test.

[0025] 3. The slide rails, small spring limiting balls, slide grooves and other structural components designed for the tail body and mass slider of the navigation body of the present invention have strong adaptability and flexibility. The slide rails and limiting balls fit tightly with the slide grooves respectively, and the small spring has a certain adaptive adjustment function. If a certain angle of attack is generated after the navigation body is ejected from the tube, the mass slider can still reciprocate along the axis in the navigation body assembly.

[0026] 4. The sealing grooves, sealing rings and other structural components designed for the tail body and bottom plate of the navigation body of the present invention can prevent water from outside the navigation body assembly from entering the interior of the model, avoid the data acquisition system in the model from being soaked and damaged, and at the same time ensure that the overall quality of the navigation body model remains consistent during the test, thereby ensuring the reliability and accuracy of the test data.

[0027] 5. Each component involved in the present invention can be independently processed and is easy to install. When designing, the overall assembly and test operation problems are fully considered. For example, the spring mounting seat and spring buckle designed on the main body of the tail of the vehicle are convenient for the installation of the mass slider, small spring and limit ball in a small space; the designed spring support and sealing buckle are convenient for the installation of the spring, probe sensor and sealing ring, and can also take into account the watertight problem.

[0028] 6. The pressure measurement device for the tail cavity bubble of the present invention is compatible with small-scale models and large-scale models. The main body of the tail of the vehicle described in the present invention and the included drive and guidance components and limit locking mechanism can be directly installed on the tail bottom plates of different-scale models, and can be used for the tail cavity bubble test research of different-scale vehicle models emerging from the water, which is convenient for quantitatively exploring the similarity problem of the vehicle emerging from the water with a tail cavity bubble.

[0029] 7. The pressure measurement device for the tail cavity bubble of the present invention is compatible with tests of different working conditions such as the vehicle being ejected from the tube, towed out of the tube, etc. The internal data acquisition system is simple to install and has a stable structure, which is convenient for wiring and reading data. At the same time, the geometric and physical parameters such as the mass and centroid of the overall model can be adjusted, and it has strong universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 is a schematic diagram of the model structure of a pressure measurement device for the tail cavity bubble of an underwater vehicle described in the present invention;

[0032] Figure 2 is a sectional view taken along line A-A of the overall structure of a pressure measurement device for the tail cavity bubble of an underwater vehicle described in the present invention;

[0033] Figure 3 is a sectional view taken along line B-B of the limit locking mechanism of a pressure measurement device for the tail cavity bubble of an underwater vehicle described in the present invention;

[0034] Figure 4 is an exploded view of the drive and guidance mechanism of a pressure measurement device for the tail cavity bubble of an underwater vehicle described in the present invention;

[0035] Figure 5 is a sectional view taken along line D-D of the main body structure of the tail of the vehicle of a pressure measurement device for the tail cavity bubble of an underwater vehicle described in the present invention;

[0036] Figure 6Cross-sectional view E-E of the main structure at the tail of the vehicle for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0037] Figure 7 Cross-sectional view of the bottom plate sealing structure of the vehicle for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0038] Figure 8 Cross-sectional view of the mass slider structure for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0039] Figure 9 Front view of the limit ball structure for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0040] Figure 10 Cross-sectional view of the sealing buckle structure for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0041] Figure 11 Cross-sectional view C-C of the installation structure of the data acquisition system for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0042] Figure 12 Cross-sectional view of the upper cabin section structure of the vehicle for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0043] Figure 13 Cross-sectional view of the lower cabin section structure of the vehicle for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0044] Figure 14 Top view of the data acquisition system structure for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0045] Figure 15 Cross-sectional view A-A of the data acquisition system structure for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention;

[0046] Figure 16 Schematic diagram of the adjustable installation structure of the data acquisition system for a pressure measurement device applied to the tail cavity bubble of an underwater vehicle according to the present invention.

[0047] In the figure: 1. Head of the vehicle; 2. Upper cabin section of the vehicle; 3. Lower cabin section of the vehicle; 4. Main body of the vehicle tail; 5. Vehicle bottom plate; 6. Mass slider; 7. Spring buckle; 8. Small spring; 9. Limit ball; 10. Spring seat; 11. Spring; 12. Probe sensor; 13. Sealing buckle; 14. Small sealing ring; 15. Large sealing ring; 16. Pressure data acquisition system; 17. Threaded rod; 18. Locking nut; 19. Counterweight block;

[0048] 2-1. First wire trough; 2-2. First installation platform; 2-3. First installation hole; 2-4. First threaded connection sub-port; 2-5. First cabin section connection sub-port;

[0049] 3-1. Second wire trough; 3-2. Second installation platform; 3-3. Second installation hole; 3-4. Second threaded connection sub-port; 3-5. Second cabin section connection sub-port;

[0050] 4-1. Spring mounting seat; 4-2. Slide rail; 4-3. Large sealing groove; 4-4. Threaded hole;

[0051] 5-1. Middle hole of the bottom plate; 5-2. Small sealing groove; 5-3. Bolt hole;

[0052] 6-1. Limit ball chute; 6-2. Limit ball lock groove; 6-3. Slide rail chute;

[0053] 9-1. Limit ball spherical surface; 9-2. Limit ball cylindrical surface;

[0054] 13-1. Middle hole of the sealing buckle; 13-2. Sealing groove;

[0055] 16-1. Threaded through hole; 16-2. Data line connection buckle; 16-3. Data reading quick connection socket. Specific implementation mode

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0057] Embodiment 1: Refer to Figure 1-4Description of this embodiment: An underwater vehicle tail cavity bubble internal pressure measurement device includes a vehicle model component, a probe sensor 12, a driving and guiding component, a locking component, a probe sensor movement sealing component, and a pressure data acquisition system 16. The driving and guiding component is installed inside the vehicle model component, is connected to the probe sensor 12, and cooperates with the locking component to drive the probe sensor 12 to make a reciprocating smooth movement along the axis of the vehicle model component. The probe sensor 12 is installed at the bottom of the vehicle model component through the probe sensor movement sealing component. The vehicle bottom plate 5 is equipped with a sealing buckle 13, and the middle hole 13-1 of the sealing buckle and the middle hole 5-1 of the bottom plate play a guiding role for the reciprocating smooth movement of the probe sensor 12.

[0058] The vehicle model component is sequentially composed of a vehicle head 1, a vehicle upper cabin section 2, a vehicle lower cabin section 3, a vehicle tail main body 4, and a vehicle bottom plate 5.

[0059] Embodiment 2: Refer to Figure 3-4 Description of this embodiment: The driving and guiding component includes a mass slider 6, a spring 11, and a slide rail 4-2. The mass slider 6 is installed inside the vehicle model component through a spring support 10. The probe sensor 12 is installed below the spring support 10. A spring 11 is installed on the outer periphery of the probe sensor 12. The inner wall of the vehicle tail main body 4 is installed with a slide rail 4-2, and the mass slider 6 moves along the slide rail 4-2.

[0060] Embodiment 3: Refer to Figure 5-6 Description of this embodiment: On both sides of the inner wall surface of the vehicle tail main body 4, a spring mounting seat 4-1 is opened, which is symmetrically distributed at 180°. The limit ball 9 locking component is installed on the limit ball chutes 6-1 on both sides of the mass slider 6. The slide rail 4-2 is located on the other two sides of the inner wall surface of the vehicle tail main body 4, forms a 90° angle with a single spring mounting seat 4-1, and is cooperatively installed on the slide rail chutes 6-3 on the other two sides of the mass slider 6.

[0061] Embodiment 4: Refer to Figure 2-9 Description of this embodiment: The locking component includes a spring buckle 7, a small spring 8, and a limit ball 9, and is installed and operates in cooperation with the structure on the vehicle tail main body 4.

[0062] When installing the components, first place the mass slider 6 along the slide rail 4-2 in the main body 4 at the tail of the vehicle. The cylindrical surface 9-2 of the limit ball 9 in the limit ball locking component is installed in the small spring 8. One end of the small spring 8 is connected to the inner end face of the tail of the vehicle, and the other end is connected to the limit ball 9 and presses the spherical surface 9-1 into the limit ball chute 6-1. The diameter of the spherical surface 9-1 of the limit ball 9 is larger than the diameter of the small spring 8, and the inner diameter of the small spring 8 is larger than the diameter of the cylindrical surface 9-2 of the limit ball 9. The spring buckle 7 is connected to the spring mounting seat 4-1 at the tail of the vehicle by bolts to restrict the smooth movement of the spring 8 and the limit ball 9 along the spring axis.

[0063] Embodiment 5: Refer to Figure 2-10 In this embodiment, the probe sensor moving seal assembly includes a seal buckle 13, a small sealing ring 14, and a large sealing ring 15, and is installed and operates in cooperation with the sealing structures on the main body 4 at the tail of the vehicle and the vehicle bottom plate 5.

[0064] When the probe sensor 12 is stationary and reciprocates through the central hole 5-1 of the vehicle bottom plate, the small sealing ring 14 ensures the watertightness at the central hole 5-1 of the bottom plate. The small sealing ring 14 is installed between the small sealing groove 5-2 of the vehicle bottom plate 5 and the sealing groove 13-2 of the seal buckle 13. Six threaded holes 4-4 are evenly distributed at the bottom of the main body 4 at the tail of the vehicle, and six countersunk bolt holes 5-3 are evenly distributed on the vehicle bottom plate 5. The main body 4 at the tail of the vehicle and the vehicle bottom plate 5 are fixedly connected by bolts. The bottom surface of the main body 4 at the tail of the vehicle is provided with a large sealing groove 4-3, and the large sealing ring 15 is pressed and fixed with the plane on the vehicle bottom plate 5 to prevent water from the threaded holes 4-4 and the bolt holes 5-3 from entering the interior of the vehicle model assembly.

[0065] Embodiment 6: Refer to Figure 11-16 In this embodiment, the pressure data acquisition system 16 is an integrated built-in test data acquisition system. During the test, the data line connection buckle 16-2 and the probe sensor 12 are connected by a signal line to transmit and store data in real time. After a single-shot test is completed, only the head 1 of the vehicle needs to be disassembled, and the data reading quick-connect socket 16-3 is connected to the computer to complete data reading, and the data acquisition system is reactivated to start the next shot test.

[0066] Embodiment 7: Refer to Figure 11-16 In this embodiment, the center of mass of the pressure data acquisition system 16 is located on its axis. When conducting tests under different working conditions, the position can be adjusted in the upper cabin section 2 and the lower cabin section 3 of the vehicle through the threaded rod 17 according to the geometric and physical parameters such as the mass and center of mass of the prototype, and the auxiliary adjustment can be carried out by adding counterweight blocks 19 on the threaded rod 17.

[0067] Embodiment 8: Refer to Figure 1-16To illustrate this embodiment, the measuring method of the underwater vehicle tail cavity internal pressure measuring device specifically comprises the following steps:

[0068] S1: Install the pressure data acquisition system 16 on the threaded rod 17 and adjust the center of mass position, then install one side of the data reading quick-connect socket 16-3 on the upper compartment 2 of the navigation body, and one end of the threaded rod 17 passes through the No. 1 mounting hole 2-3 and is fixed on the No. 1 mounting platform 2-2 by the locking nut 18;

[0069] S2: Pass the other end of the threaded rod 17 through the No. 2 mounting hole 3-1 of the lower cabin section 3 of the navigation body, connect the No. 2 cabin section connecting sub-port 3-5 of the lower cabin section 3 of the navigation body with the No. 1 cabin section connecting sub-port 2-5 of the upper cabin section 2 of the navigation body, and tighten the threaded rod 17 to fix the two cabin sections by the locking nut 18;

[0070] S3: Connect the signal line of the probe sensor 12 to the data line connector 16-2, then connect the tail body 4 of the navigation body with the drive guide assembly, the limit ball locking assembly and the motion sealing mechanism installed through the No. 2 threaded connection port 3-4, and finally install and fix the head 1 of the navigation body through the No. 1 threaded connection port 2-4.

[0071] S4: When the navigation body model assembly is installed in the launch tube and is in a stationary state, the gravity of the mass slider 6, the spring seat 10 and the probe sensor 12, the elastic force of the spring 11 and the friction force of the small sealing ring 14 are in static equilibrium, and the limiting ball 9 is located at a distance above the limiting ball lock groove 6-2.

[0072] S5: When the vehicle model assembly is launched, the mass slider 6 and the spring holder 10 are driven by inertia to continuously squeeze the spring 11, and the probe sensor 12 moves vertically downward and protrudes relative to the vehicle bottom plate 5 to measure the pressure inside the tail cavity and transmit the signal to the pressure data acquisition system 16.

[0073] Implementation method nine: See Figure 1-16 To illustrate this embodiment, after the navigation body model assembly emerges from the water, it is intercepted by the blocking net above the water surface. The mass slider 6 and the spring seat 10 move vertically upward relative to each other due to inertia. The limiting ball 9 passes over the limiting ball slide groove 6-1 and slides into the limiting ball lock groove 6-2, and is squeezed and locked by the small spring 8. At this time, the probe sensor 12 is located in the tail 4 of the navigation body, which can prevent the probe sensor 12 from being damaged when falling into the water.

[0074] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well.

Claims

1. An underwater vehicle tail cavity bubble internal pressure measuring device, characterized in that: It includes a vehicle model component, a driving and guiding component, a locking component, a probe sensor (12), a probe sensor moving seal component, and a pressure data acquisition system (16); The driving and guiding component is installed inside the vehicle model component, connected to the probe sensor (12), and cooperates with the locking component to drive the probe sensor (12) to make reciprocating smooth movement along the axis of the vehicle model component. The probe sensor (12) is installed at the bottom of the vehicle model component through the probe sensor moving seal component.

2. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 1, characterized in that: The vehicle model component includes a vehicle head (1), a vehicle upper cabin section (2), a vehicle lower cabin section (3), a vehicle tail main body (4), and a vehicle bottom plate (5) connected in sequence.

3. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 2, characterized in that: The driving and guiding component includes a mass slider (6), a spring (11), and a slide rail (4-2). The mass slider (6) is installed inside the vehicle model component through a spring clamp seat (10). The probe sensor (12) is installed below the spring support (10). A spring (11) is installed on the outer periphery of the probe sensor (12). The slide rail (4-2) is installed on the inner wall of the vehicle tail main body (4). The mass slider (6) moves along the slide rail (4-2).

4. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 2, characterized in that: On both sides of the inner wall surface of the vehicle tail main body (4), a spring mounting seat (4-1) is opened, symmetrically distributed at 180°. The locking component is installed on the limit ball chutes (6-1) on both sides of the mass slider (6). The slide rail (4-2) is located on the other two sides of the inner wall surface of the vehicle tail main body (4), at a 90° angle to a single spring mounting seat (4-1), and is cooperatively installed on the slide rail chutes (6-3) on the other two sides of the mass slider (6).

5. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 3, characterized in that: The locking component includes a spring buckle (7), a small spring (8), and a limit ball (9). The cylindrical surface (9-2) of the limit ball (9) is installed inside the small spring (8). One end of the small spring (8) is connected to the inner end face of the vehicle tail main body (4), and the other end is connected to the limit ball (9) and squeezes the spherical surface (9-1) into the limit ball chute (6-1); the diameter of the spherical surface (9-1) of the limit ball (9) is larger than the diameter of the small spring (8), and the inner diameter of the small spring (8) is larger than the diameter of the cylindrical surface (9-2) of the limit ball (9); the spring buckle (7) is connected to the vehicle tail spring mounting seat (4-1) to limit the smooth movement of the small spring (8) and the limit ball (9) along the spring central axis.

6. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 2, characterized in that: The probe sensor moving seal assembly includes a seal buckle (13), a small sealing ring (14) and a large sealing ring (15). The small sealing ring (14) is installed between the small sealing groove (5-2) of the vehicle bottom plate (5) and the sealing groove (13-2) of the seal buckle (13). The bottom of the main body (4) at the tail of the vehicle is evenly provided with n threaded holes (4-4), and the vehicle bottom plate (5) is evenly provided with n countersunk bolt holes (5-3). The main body (4) at the tail of the vehicle is fixedly connected with the vehicle bottom plate (5) through bolts. The bottom surface of the main body (4) at the tail of the vehicle is provided with a large sealing groove (4-3), and the large sealing ring (15) is extrusion-fixed with the plane on the vehicle bottom plate (5) to prevent water from the threaded holes (4-4) and the countersunk bolt holes (5-3) from entering the interior of the vehicle model assembly.

7. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 1, wherein: The pressure data acquisition system (16) is an integrated built-in test data acquisition system. During the test, the data line connection buckle (16-2) is connected with the probe sensor (12) through a signal line to transmit and store data in real time. After a single-shot test is completed, only the vehicle head (1) can be disassembled, the data reading quick-connect socket (16-3) is connected to a computer to complete data reading, and the data acquisition system is reactivated to start the next shot test.

8. The underwater vehicle tail cavity bubble internal pressure measuring device according to claim 2, characterized in that: The centroid of the pressure data acquisition system (16) is located on its axis. When conducting tests under different working conditions, the position is adjusted in the upper cabin section (2) and the lower cabin section (3) of the vehicle through the threaded rod (17) according to the geometric and physical parameters such as the mass and centroid of the prototype, and auxiliary adjustment can be carried out by adding counterweight blocks (19).

9. A measuring method for the pressure measurement device of the underwater vehicle's trailing cavity bubble according to claim 8, characterized in that: Specifically, it includes the following steps: S1: Install the pressure data acquisition system (16) on the threaded rod (17) and adjust the centroid position. Then, install one side of the data reading quick-connect socket (16-3) on the upper cabin section (2) of the vehicle. One end of the threaded rod (17) passes through the first mounting hole (2-3) and is fixed on the first mounting platform (2-2) by a locking nut (18). S2: Pass the other end of the threaded rod (17) through the second mounting hole (3-1) of the lower cabin section (3) of the vehicle. The second cabin section connection sub-mouth (3-5) of the lower cabin section (3) of the vehicle is docked with the first cabin section connection sub-mouth (2-5) of the upper cabin section (2) of the vehicle, and the threaded rod (17) is tightened by a locking nut (18) to fix the two cabin sections. S3: Connect the signal line of the probe sensor (12) with the data line connection buckle (16-2). Then, connect the main body (4) at the tail of the vehicle with the drive guiding assembly, the locking assembly and the probe sensor moving seal mechanism installed through the second threaded connection sub-mouth (3-4), and finally install and fix the vehicle head (1) through the first threaded connection sub-mouth (2-4). S4: When the vehicle model assembly is installed in the launch tube and in a static state, the gravity of the mass slider (6), the spring seat (10) and the probe sensor (12) is in static balance with the elastic force of the spring (11) and the frictional force of the small sealing ring (14), and the limit ball (9) is located above the limit ball lock groove (6-2). S5: When the vehicle model assembly is launched, the mass slider (6) and the spring chuck (10) are driven by inertia, continuously squeezing the spring (11). The probe sensor (12) moves vertically downward and protrudes relative to the vehicle bottom plate (5) to measure the pressure inside the tail air bubble and transmit the signal to the pressure data acquisition system (16).

10. The measuring method of the underwater vehicle tail cavity bubble internal pressure measuring device according to claim 9, characterized in that: After the vehicle model assembly emerges from the water and is intercepted by the blocking net above the water surface, the mass slider (6) and the spring chuck (10) move relatively vertically upward due to inertia. The limit ball (9) moves over the limit ball chute (6-1) and slides into the limit ball locking groove (6-2), and is locked by the compression of the small spring (8). At this time, the probe sensor (12) is located inside the main body (4) at the tail of the vehicle, preventing the probe sensor (12) from being damaged when falling into the water.

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