Experimental device for exploring attack effect of underwater near-field explosion on small-size and small-mass target

Abstract

The utility model belongs to the technical field of underwater explosion experiments, and particularly relates to an experimental device for exploring the attack effect of underwater near-field explosion on a small-size and small-mass target, which comprises a trough plate, an experimental bracket, an experimental water tank, a high-voltage electric control box, an electric spark base and an experimental cylinder, the experiment water tank is installed in the experiment support, a cross beam is installed on the top of the experiment support, and a structural frame extending in the vertical direction is arranged on the cross beam. The trough plate is mounted at the lower end of the structural frame; the experimental cylinder is connected with the trough plate through the mounting mechanism; the electric spark base is mounted in the experimental water tank, the discharge needle column is mounted on the electric spark base, and the discharge needle is mounted at the upper end of the discharge needle column; in the experiment water tank, the experiment cylinder and the spray point are located below the water surface, and a light source and a high-speed camera are arranged on the two sides of the experiment support. The high-speed camera is connected with the signal acquisition instrument; and the high-voltage electric control box is connected with the spray point through a wire, and is connected with the high-speed camera and the signal acquisition instrument through the synchronous sensor.

Description

Technical Field

[0001] The utility model belongs to the technical field of underwater explosion experiments, and in particular relates to an experimental device for exploring the attack effect of underwater near-field explosion on a small-size and small-mass target. Background Art

[0002] Underwater unmanned systems are a typical small underwater target, characterized by their small size and light mass. Therefore, under the action of an explosive load, bubbles will envelop small targets or cause them to move. Current research shows that the damage effects of the shock wave and bubbles generated by the explosion on the target vary significantly, depending on factors such as the size, mass, and shape of the target. Currently, the technology for measuring the wall pressure generated by underwater near-field explosions on curved surface boundaries is relatively mature. For example, Chinese invention patent application number CN202010557766.5 discloses a multi-angle electric spark bubble wall pressure load test device. However, existing explosion test devices are mainly aimed at larger targets, and research on small targets is still insufficient, resulting in a lack of effective data and theoretical support to understand the impact of explosions on these targets.

[0003] These targets exhibit unique response characteristics during explosions, further complicating research. However, there is currently a lack of experimental equipment capable of simulating these conditions in the laboratory. Therefore, it is crucial to develop an explosion test facility that can accommodate small, low-mass targets, thereby providing more accurate experimental data for damage assessment and defense design. Utility Model Content

[0004] The utility model aims to provide an experimental device for exploring the attack effect of underwater near-field explosion on small-sized and small-mass targets.

[0005] An experimental device for exploring the attack effect of underwater near-field explosion on small-sized and small-mass targets includes a slot plate, an experimental bracket, an experimental water tank, a high-voltage electric control box, an electric spark base and an experimental cylinder; the experimental water tank is installed in the experimental bracket, a crossbeam is installed on the top of the experimental bracket, and a structural frame extending in the vertical direction is provided on the crossbeam; the slot plate is installed at the lower end of the structural frame, and the experimental cylinder is connected to the slot plate through a mounting mechanism; the electric spark base is installed in the experimental water tank, a discharge needle column is installed on the electric spark base, and a discharge needle is installed at the upper end of the discharge needle column; in the experimental water tank, the experimental cylinder and the discharge needle are located below the water surface, and the distance between the experimental cylinder and the discharge needle meets the experimental requirements; light sources and high-speed cameras are provided on both sides of the experimental bracket; the high-speed camera is connected to a signal acquisition instrument; the high-voltage electric control box is connected to the discharge needle through a wire, and is connected to the high-speed camera and the signal acquisition instrument through a synchronous sensor.

[0006] Furthermore, the slot plate is provided with a positioning opening and two slots, and the positioning opening is located between the two slots.

[0007] Furthermore, the trough plate is arranged vertically and fixed to the lower end of the structural frame by bolts at its four corners. The mounting mechanism for the test cylinder includes two sets of sliding locators, the spacing between the two sets of sliding locators being adapted to the test cylinder. The upper end of the test cylinder is fixed to the lower ends of the two sets of sliding locators, and the upper ends of the two sets of sliding locators are fixed to the notches of the trough plate.

[0008] Furthermore, the upper end of the sliding positioning piece is fixed to the two notches on the slot plate by positioning bolts.

[0009] Furthermore, the upper end of the experimental cylinder is fixed to the lower end of the sliding positioning piece by a sheep eye screw.

[0010] Furthermore, the slot plate is arranged horizontally and fixed to the lower end of the structural frame via corner brackets at its four corners. The experimental cylinder mounting mechanism includes two sets of slides, the spacing between which matches the experimental cylinder. The slides include upper annular mounting openings and lower slide rails. The upper annular mounting openings of the two sets of slides are inserted into the two slots of the slot plate via positioning sliders. The left and right ends of the experimental cylinder are placed in the lower slide rails of the two slides on both sides. The two sets of positioning sliders are fixed in the positioning openings of the slot plate.

[0011] Furthermore, mounting holes are provided on both sides of the upper portion of the annular mounting opening of the slide, and are connected to both sides of the lower portion of the positioning slide block via bolts.

[0012] Furthermore, the positioning slide block is fixed in the positioning opening of the slot plate by a locking bolt.

[0013] The beneficial effects of the present invention are:

[0014] The experimental device of this utility model demonstrates outstanding advantages in improving the scientificity and applicability of underwater near-field explosion experiments, and lays a solid foundation for in-depth research on the damage mechanism of small-size and small-mass targets; it adopts modular and flexible design to achieve precise and synchronous data acquisition, non-contact parameter extraction and intelligent nonlinear motion analysis, and adapt to complex experimental scenarios; it provides a reliable experimental platform for the study of the damage mechanism of small targets, and lays a technical foundation for the attack and defense testing of underwater unmanned systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic front view of the first experimental cylinder installation mechanism in the present invention.

[0016] Figure 2 This is a schematic isometric view of the first experimental cylinder mounting mechanism in the present invention.

[0017] Figure 3 This is a schematic front view of the second experimental cylinder installation mechanism in the present invention;

[0018] Figure 4 This is a schematic isometric view of the second experimental cylinder mounting mechanism in the present invention.

[0019] Figure 5 It is a partial schematic diagram of the electric spark discharge needle in the utility model.

[0020] Figure 6 This is a partial structural diagram of the assembly of the second experimental cylinder installation mechanism and the experimental water tank in the present utility model.

[0021] Figure 7 It is a schematic diagram of the overall structure of the experimental device of the present utility model.

[0022] Figure 8 This is a schematic diagram of the assembly of the sliding plate and the positioning slider in the utility model.

[0023] Figure 9 This is a schematic diagram of the explosion structure of the second experimental cylinder installation mechanism in the present utility model.

[0024] Figure 10 This is a schematic structural diagram of the second experimental cylinder in the present invention.

[0025] Figure 11 for Figure 10 Schematic diagram of the cross section at AA in the middle. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 11 As shown, the utility model provides an experimental device for exploring the attack effect of underwater near-field explosion on small-sized and small-mass targets, including a second experimental cylinder 1, a slide rail 2, a groove plate 3, a positioning slider 4, an angle code 5, a structural frame 6, a sliding positioning plate 7, an eye screw 8, a first experimental cylinder 9, a light source 10, an experimental bracket 11, an experimental water tank 12, a high-speed camera 13, a signal acquisition instrument 14, a high-voltage control box 15, a crossbeam 16, an electric spark base 17, a discharge needle column 18, a discharge needle 19, a positioning bolt 20, and a locking bolt 21.

[0028] A positioning hole 32 and two slots 31 are provided on the slot plate 3, and the positioning hole 32 is located between the two slots 31; the experimental water tank 12 is installed in the experimental bracket 11, and a crossbeam 16 is installed on the top of the experimental bracket 11, and a structural frame 6 extending in the vertical direction is provided on the crossbeam 16; the electric spark base 17 is installed in the experimental water tank 12, and a discharge needle column 18 is installed on the electric spark base 17, and a discharge needle 19 is installed on the upper end of the discharge needle column 18; a light source 10 and a high-speed camera 13 are provided on both sides of the experimental bracket 11; the high-speed camera 13 is equipped with a signal acquisition instrument 14 for capturing the contact process between the electric spark bubble and the experimental cylinder; the high-voltage control box 15 is connected to the discharge needle 19 through a wire, and is connected to the high-speed camera 13 and the signal acquisition instrument 14 through a synchronization sensor to ensure that the high-voltage control box 15, the high-speed camera 13 and the signal acquisition instrument 14 work synchronously;

[0029] The first experimental cylinder mounting mechanism includes a first experimental cylinder 9 and two sets of sliding positioning pieces 7. The spacing between the two sets of sliding positioning pieces 7 is adapted to the first experimental cylinder 9. The upper end of the first experimental cylinder 9 is fixed to the lower ends of the two sets of sliding positioning pieces 7.

[0030] The second experimental cylinder mounting mechanism includes a second experimental cylinder 1 and two sets of slides, the spacing between the two sets of slides is adapted to the second experimental cylinder 1; the slide includes an upper annular mounting opening 71 and a lower slide rail 2; the two ends of the second experimental cylinder 1 are respectively arranged in the lower slide rails 2 of the slides on both sides.

[0031] When applying this utility model to conduct experiments:

[0032] Step 1: Design the first experimental cylinder 9 and the second experimental cylinder 1 based on the goal of small size and low mass. The first experimental cylinder 9 is a complete cylinder, and the second experimental cylinder 1 has slide grooves on both ends. The radius and mass of the first experimental cylinder 9 and the second experimental cylinder 1 are equal.

[0033] Step 2: Arrange the trough plate 3 vertically and fix it to the lower end of the structural frame 6 with bolts at the four corners. After adjusting the spacing between the two sets of sliding positioning pieces 7, the upper ends of the sliding positioning pieces 7 are fixed to the two notches 31 on the trough plate 3 with positioning bolts 20. The upper end of the first experimental cylinder 9 is fixed to the lower end of the sliding positioning piece 7 with eye screws 8.

[0034] Step 3: Pour water into the experimental water tank 12, and adjust the longitudinal position of the electric spark base 17 according to the experimental content so that the first experimental cylinder 9 and the discharge needle 19 are located below the water surface, and the distance between the first experimental cylinder 9 and the discharge needle 19 meets the experimental requirements; adjust the light source 10 and the high-speed camera 13 so that the illumination intensity of the light source 10 meets the experimental requirements, and make the shooting positions of the light source 10 and the high-speed camera 13 on the same horizontal line as the discharge needle 19;

[0035] Step 4: Start the experiment of the first experimental cylinder 9, and use the high-voltage electric control box 15 to make the underwater discharge needle 19 generate underwater bubbles, and the high-speed camera 13 and the signal acquisition instrument 14 work synchronously;

[0036] Step 5: Unload the first experimental cylinder 9, the sliding positioning piece 7 and the slot plate 3; arrange the slot plate 3 horizontally and fix it to the lower end of the structural frame 6 through the corner brackets 5 at the four corners. The upper annular mounting openings 71 of the two sets of slides are inserted into the two notches 31 of the slot plate 3 through the positioning sliders 4. Mounting holes are provided on both sides of the upper annular mounting openings 71 of the slides and are connected to the lower sides of the positioning sliders 4 by bolts; after adjusting the spacing between the two sets of slides by sliding the positioning sliders 4, the left and right ends of the second experimental cylinder 1 are placed in the lower slide rails 2 of the slides on both sides. The two sets of positioning sliders 4 are fixed in the positioning openings 32 of the slot plate 3 by locking bolts 21;

[0037] Step 6: Adjust the water level in the experimental water tank 12, the initial position and distance between the second experimental cylinder 1 and the discharge needle 19, and the shooting position of the light source 10 and the high-speed camera 13, consistent with step 3;

[0038] Step 7: Start the experiment of the second experimental cylinder 1. Use the high-voltage electric control box 15 to make the underwater discharge needle 19 generate the same underwater bubbles as in step 4. The second experimental cylinder 1 moves vertically along the lower slide rails 2 of the slides 4 on both sides due to the bubble explosion. The high-speed camera 13 and the signal acquisition device 14 work synchronously.

[0039] Step 8: Based on the video captured by the high-speed camera 13, process each frame of the image to convert it into a grayscale image, apply Gaussian blur to smooth the image, and then obtain the contours of the bubble, the first experimental cylinder 9, and the second experimental cylinder 1 through edge detection and binary filling;

[0040] Features are extracted from each connected area of the bubble contour, and the variation pattern of the bubble pulsation velocity with the distance parameter in the two experiments is obtained based on the image size and proportional dimensions; feature points are extracted from each connected area of the first experimental cylinder 9 and the second experimental cylinder 1, the displacement of the second experimental cylinder 1 is identified, and the Hurst exponent of the displacement time series is calculated based on the rescaled range analysis method. Based on the Hurst exponent, the nonlinear motion law of the second experimental cylinder 1 is obtained, completing the experiment on the attack effect of underwater near-field explosion on small-sized and small-mass targets.

[0041] Based on the rescaled range analysis method, the mean of the time series is calculated. The time series X={X1,X2,...,X N}, where N represents the length of the sequence, and X represents the time series of displacement, velocity, and acceleration. First, calculate the mean of the time series:

[0042]

[0043] Calculate the deviation sequence Y i for:

[0044]

[0045] Calculate the cumulative deviation sequence Z i :

[0046]

[0047] The range of the cumulative deviation series is defined as:

[0048] R(N)=max(Z1,Z2,...,Z N )-min(Z1,Z2,...,Z N )

[0049] That is, calculate the difference between the maximum and minimum values of the Z sequence;

[0050] The standard deviation S(N) of the time series X is:

[0051]

[0052] According to the rescaled range analysis method, the relationship between the rescaled range R / S and the time scale N obeys a power law relationship:

[0053]

[0054] Taking the logarithm, both sides become a linear relationship:

[0055]

[0056] Through linear regression, the slope H value is obtained, which is the Hurst exponent.

[0057] The existing experimental cylinder fixing mechanism can only limit the experimental cylinder of a specific size, and the constraint method of the experimental cylinder is single, which cannot meet the needs of exploring the attack effect of explosion on small-sized and small-mass targets.

[0058] When an underwater unmanned system is attacked by an anti-UUV system directly below it, it will move, with movement perpendicular to the horizontal plane (the Z direction) being the most pronounced. A strong attack could even damage the underwater unmanned system. To simulate the attack process in the experimental water tank 12, the underwater unmanned system can be simplified as a cylinder.

[0059] There are two structures of the experimental cylinder, corresponding to two experimental constraints.

[0060] The first constraint condition is that when the experiment is carried out with the first experimental cylinder 9 as the target, the first experimental cylinder 9 has no degree of freedom and the first experimental cylinder fixing mechanism is used. Figure 1 The middle structural frame 6 is mounted on the crossbeam 16 by bolts, and the slot plate 3 is fixed to the lowermost side of the structural frame 6 by bolts, that is, the slot plate 3 is perpendicular to the ground; the upper half of the two sliding positioning plates 7 has two through holes, and the positioning bolts 20 pass through the through holes on the sliding positioning plates 7 and the corresponding notches 31 on the slot plate 3, and are connected to the positioning nuts. The positioning bolts 20 securely connect the sliding positioning plates 7 to the slot plate 3. The eyelet screws 8 are fixed to the lower end of the sliding positioning plates 7 by bolts, and the self-tapping threaded portion of the eyelet screws 8 cooperates with the blind hole threads reserved on the surface of the first experimental cylinder 9. By changing the position of the positioning bolts that match the sliding positioning plates 7 and the slot plate 3, the distance between the two sliding positioning plates 7 can be adjusted to accommodate first experimental cylinders 9 of different lengths.

[0061] The second constraint condition is that when conducting experiments with the second experimental cylinder 1 with positioning slots at both ends as the target, the second experimental cylinder 1 with positioning slots at both ends is fixed in the X and Y directions and free in the Z direction, that is, the second experimental cylinder with positioning slots at both ends can only move perpendicular to the ground. Using the second experimental cylinder fixing mechanism, the structural frame 6 is installed on the mounting beam 16 by bolts, and the slot plate 3 is connected to the structural frame 6 by bolts and angle brackets 5. The slot plate 3 is directly below the structural frame 6 and is parallel to the ground. Two positioning sliders 4 are installed in the corresponding slots of the slot plate. There is a through hole at the central symmetry axis of the upper end face of the positioning slider 4. The locking bolt 21 passes through the through hole and is connected to the positioning hole 32 on the center line of the slot plate 3 and the locking nut. By loosening the locking bolt 21 on the upper end face of the positioning slider, the distance between the positioning sliders 4 can be adjusted to accommodate second experimental cylinders of different lengths. In the Z-direction free experiment, the second experimental cylinder 1 with positioning grooves at both ends is clearance-matched with the slide rail 2, and is circumferentially and axially limited with the slide rail 2, ensuring that the second experimental cylinder 1 with positioning grooves at both ends moves only in the Z direction after being subjected to the bubble pulsation load.

[0062] When the underwater near-field spark explosion load acts on the surface of the test cylinder, the test cylinder will exhibit a corresponding response, including movement and damage. By adjusting the mounting position of the spark base 17, the discharge needle 19 and the test cylinder can maintain a certain relative position. The discharge needle 19 is mounted on the discharge needle pin 18, which is mounted on the spark base 17, which is mounted on the crossbeam 16. The discharge needle 19, discharge needle pin 18, and spark base 17 are all immersed below the water surface in the test water tank 12. The position of the test cylinder in the test water tank 12 can be adjusted by adjusting the position of the structural frame 6 on the mounting crossbeam 16.

[0063] The high-voltage control box 15 is connected to the discharge needle 19 through a wire. At the same time, the high-voltage control box 15 is connected to the high-speed camera 13 and the signal acquisition device 14 through a synchronization sensor. The purpose is to ensure that the high-voltage control box 15, the high-speed camera 13, and the data acquisition device work synchronously. Because the time from the generation to the collapse of the underwater explosion bubble is very short (millisecond level), all devices need to work at the same time to avoid missing relevant data and phenomena due to the short time of the experimental phenomenon, especially the process from the electric spark bubble to the contact with the experimental cylinder until the collapse.

[0064] The experimental use environment of this utility model is as follows Figures 5 to 7 As shown, the experimental water tank 12 is made of transparent glass, ensuring that light emitted by the light source 10 can pass through the experimental water tank. Simultaneously, the high-speed camera 13 captures the movement of objects within the experimental water tank. During the experiment, the experimental water tank is placed on a test stand and secured. The light source and high-speed camera are placed on either side of the experimental water tank. The light source is 0.5 meters from the wall of the experimental water tank. The high-speed camera is 0.5 meters from the wall of the experimental water tank. The center of the light source is at the same height as the high-speed camera. The experimental table is placed approximately 2 meters from the experimental water tank. The data acquisition instrument and high-voltage control box are placed on the table.

[0065] The experimental bracket 11 is composed of aluminum profiles, which are connected by bolts and angle brackets. The experimental bracket 11 is 1.5m high and 0.78m wide. The overall frame of the bracket is composed of 4 1.5m and 8 0.7m aluminum profiles. The water tank platform is made of 7 0.7m long aluminum profiles and is installed in the lower part of the overall structure of the experimental bracket. The upper platform is 0.5m above the ground.

[0066] During the experiment, the experimental water tank 12 is installed and fixed on the water tank platform of the experimental bracket 11; the experimental water tank 12 is adjusted to the middle position; the crossbeam 16 is fixed on the experimental bracket 11; the structural frame 6 and the crossbeam 16 are fixed by bolts; the height of the structural frame 6 is adjusted so that the experimental cylinder is in the center position below the horizontal plane in the experimental water tank 12; the distance between the discharge needle 19 and the two experimental cylinders is adjusted; the discharge needle 19 discharges to generate electric sparks, thereby causing the discharge needle 19 in the experimental water tank 12 to generate bubbles, and the bubbles are coupled with the first experimental cylinder 9 or the second experimental cylinder 1 and interact with each other. Under the interaction, the second experimental cylinder 1 moves in the Z direction, and the first experimental cylinder 9 does not move; at the same time, the bubbles pulsate and collapse; the high-speed camera 13 shoots the entire experimental process, and the signal acquisition instrument 14 stores the video file of the experimental process.

[0067] A high-speed camera 13 and a signal acquisition device 14 are used to capture the contact process between the spark bubble and the experimental cylinder, simulating the attack process of the anti-underwater unmanned system. This provides an experimental basis for analyzing the near-field bubble pulsation and load characteristics of the cylindrical surface boundary under different attack angles and explosion distances.

[0068] Relying on the images captured by the high-speed camera 13, an image processing program was developed through secondary programming to read the video frame by frame and convert it into a grayscale image; Gaussian blur was applied to smooth the image, and then the contours of bubbles and small-sized, small-mass targets were obtained through edge detection and binary filling.

[0069] Features are extracted from each connected area of the bubble, such as the maximum diameter (radius) and filling degree; after the bubble reaches the maximum radius, the moment when the filling degree is lower than 0.3 is checked to detect bubble rupture; the change curves of the bubble radius and filling degree are plotted; the rupture time (in milliseconds) is output on the console; based on the bubble radius change rate, the expansion speed is a positive value and the contraction speed is a negative value, the following are obtained: the bubble radius change curve over time, the bubble expansion speed change curve over time, and the bubble longitudinal position and longitudinal speed change curve over time; the bubble motion form and bubble load are automatically identified to achieve non-contact measurement of the bubble parameters, and the change pattern of the first and second pulsating bubble loads with the distance parameter is identified.

[0070] Extract feature points from each connected area of small-sized and small-mass targets, automatically identify the motion form of small-sized and small-mass targets, and automatically output the motion parameters of small-sized and small-mass targets (including displacement, velocity, acceleration, etc.).

[0071] The experimental device of the utility model has a simple structure, is suitable for small size and small mass targets, and the replaceable mechanism parts are mutually interchangeable. The structure is convenient to assemble and disassemble, and the operation is simple, so that multiple repeated experiments can be carried out conveniently.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An experimental device for investigating the effects of underwater near-field explosions on small-sized and small-mass targets, characterized by: The invention comprises a slot plate (3), an experimental support (11), an experimental water tank (12), a high-voltage electric control box (15), an electric spark base (17) and an experimental cylinder; the experimental water tank (12) is installed in the experimental support (11), a crossbeam (16) is installed on the top of the experimental support (11), and a structural frame (6) extending in a vertical direction is provided on the crossbeam (16); the slot plate (3) is installed at the lower end of the structural frame (6), and the experimental cylinder is connected to the slot plate (3) through a mounting mechanism; the electric spark base (17) is installed in the experimental water tank (12), and a spark ignition source is installed on the spark ignition source (17). The invention relates to an electric needle column (18), wherein a discharge needle (19) is installed at the upper end of the discharge needle column (18); in an experimental water tank (12), the experimental cylinder and the discharge needle (19) are located below the water surface, and the distance between the experimental cylinder (9) and the discharge needle (19) meets the experimental requirements; a light source (10) and a high-speed camera (13) are provided on both sides of the experimental bracket (11); the high-speed camera (13) is connected to a signal acquisition instrument (14); the high-voltage electric control box (15) is connected to the discharge needle (19) through a wire, and is connected to the high-speed camera (13) and the signal acquisition instrument (14) through a synchronous sensor.

2. The experimental device for investigating the effect of underwater near-field explosions on small-sized and small-mass targets according to claim 1, characterized in that: The slot plate (3) is provided with a positioning opening (32) and two slots (31), and the positioning opening (32) is located between the two slots (31).

3. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 2, characterized in that: The trough plate (3) is arranged vertically and is fixed to the lower end of the structural frame (6) by bolts at the four corners.

4. The experimental device for investigating the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 3, characterized in that: The mounting mechanism of the experimental cylinder comprises two groups of sliding positioning pieces (7), the spacing between the two groups of sliding positioning pieces (7) is adapted to the experimental cylinder, the upper end of the experimental cylinder is fixed to the lower ends of the two groups of sliding positioning pieces (7), and the upper ends of the two groups of sliding positioning pieces (7) are fixed in the notches (31) of the slot plate (3).

5. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 4, characterized in that: The upper ends of the sliding positioning pieces (7) are respectively fixed in two notches (31) on the slot plate (3) via positioning bolts (20).

6. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 4, characterized in that: The upper end of the experimental cylinder is fixed to the lower end of the sliding positioning plate (7) through a sheep eye screw (8).

7. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 2, characterized in that: The trough plate (3) is arranged horizontally and is fixed to the lower end of the structural frame (6) through corner brackets (5) at the four corners.

8. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 7, characterized in that: The mounting mechanism of the experimental cylinder includes two groups of slides, and the spacing between the two groups of slides is adapted to the experimental cylinder; the slides include an upper annular mounting opening (71) and a lower slide rail (2), and the upper annular mounting openings (71) of the two groups of slides are inserted into the two notches (31) of the slot plate (3) through positioning sliders (4), and the left and right ends of the experimental cylinder are arranged in the lower slide rails (2) of the slides on both sides, and the two groups of positioning sliders (4) are fixed in the positioning openings (32) of the slot plate (3).

9. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 8, characterized in that: Mounting holes are provided on both sides of the upper portion of the annular mounting opening (71) of the slide, and the slide is connected to both sides of the lower portion of the positioning slide block (4) via bolts.

10. The experimental device for studying the effect of underwater near-field explosion on small-sized and small-mass targets according to claim 8, characterized in that: The positioning slide block (4) is fixed in the positioning opening (32) of the slot plate (3) via a locking bolt (21).

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