Near-seabed explosive explosion simulation test device and test method

Abstract

The invention discloses a near-seabed explosive explosion simulation test device and test method. The device comprises an explosion water tank system, a seabed simulation device, an optical measurement system, an electric measurement system, a fixed test frame component and an illumination system. The explosion water tank system comprises an explosion water tank arranged on the ground; the seabed simulation device comprises a medium box body which is filled with a seabed medium; the optical measurement system comprises a high-speed camera and a computer; the electric measurement system comprises a sensor and a data acquisition instrument arranged outside the explosion water tank; the fixed test frame component comprises a cross beam fixedly arranged at the upper part in the explosion water tank, an explosive column is connected below the middle part of the cross beam through a fixed grain rod, and a sensor is connected below the cross beam at each of the two sides of the fixed grain rod through a fixed sensor rod; the explosive column and the sensor are positioned right above the medium box body; the sensor is connected with a data acquisition instrument. The method is low in cost, easy to operate, efficient, safe, accurate and reliable in result and suitable for near-seabed explosive explosion simulation tests, and the similarity between the obtained parameters and the actual parameters is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bottom-sinking explosion test. Specifically, it relates to a near-seabed explosive explosion simulation test device and a testing method, which are used for measuring the shock wave pressure and bubble pulsation of explosives at different seabed media and distances from the seabed. BACKGROUND

[0002] Modern sea battles are a cooperative and three-dimensional combat mode of air, sky, water surface, water and seabed. Seabed attack and defense have an extremely important influence on the victory of the battle and the control of sea power. Submarines, underwater pre-positioned weapons, seabed gas and oil pipelines, and seabed base stations will become the primary targets and attack objects in future seabed attack and defense wars. Therefore, it is of great military significance and engineering application value to carry out related research on near-seabed explosive underwater explosion. According to the type of near-seabed explosion load and the difference of different explosion distances, the underwater explosion load can be divided into bottom-sinking explosion and near-seabed explosion. The near-seabed explosive explosion load is different from the free-field explosion. Affected by the seabed boundary, the shock wave has obvious water-bottom reflection effect, which enhances or weakens the shock wave load in the water area, so that the shock wave pressure in different directions and the attenuation law in the water area are quite different from those in the free field. Different seabed media have different physical and mechanical properties and geometric differences, which will present different shock wave water-bottom reflection, cavitation and other complex load effects, form a very complex wave system near the seabed boundary, and the time of the transmitted wave reaching different areas is also different.

[0003] Due to the complex interaction of the reflection wave near the seabed and the incident wave, in engineering, the free-field underwater explosion shock wave calculation model is usually used to calculate 1.2-1.5 times of the actual charge amount, but the related test research shows that this treatment is not adaptive to different seabed media and has low calculation accuracy. At present, the energy output characteristics of explosives in the free field have been fully studied, but since the bottom-sinking explosive underwater explosion involves complex dynamic boundary effects, different physical and mechanical properties of seabed media, charge amount, etc. have a great influence on the pressure distribution and bubble pulsation of the near-seabed explosion flow field, and the law of the underwater shock wave and bubble load of the bottom-sinking explosive explosion in different seabed media has not been systematically studied. SUMMARY

[0004] The purpose of the present application is to provide a near-seabed explosive explosion simulation test device and a testing method to solve the technical problems of the prior art, i.e., the lack of adaptability to different seabed media and low calculation accuracy.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] In one aspect, the present application provides a near-seabed explosive explosion simulation test device, comprising: an explosive water tank system, a seabed simulation device, a light measurement system, an electric measurement system, a fixed test frame component, an illumination system;

[0007] The explosive water tank system comprises an explosive water tank arranged on the ground, and a foam rubber damping layer is arranged on the inner wall of the explosive water tank; one side of the bottom of the explosive water tank is connected to a drainage pool through a drainage pipe, and a drainage valve is arranged on the drainage pipe; the other side is connected to a water source pool through a water pump; three observation windows are arranged in the middle of the explosive water tank, one main observation window and two auxiliary observation windows, and the light measurement system is arranged outside the main observation window, and the illumination system is arranged outside the two auxiliary observation windows;

[0008] The seabed simulation device comprises a medium box arranged on a support, and the medium box contains seabed medium;

[0009] The light measurement system comprises a high-speed camera and a computer;

[0010] The electric measurement system comprises a sensor and a data acquisition instrument arranged outside the explosive water tank;

[0011] The fixed test frame component is fixed to the explosive water tank and comprises a crossbeam fixed to the upper part of the explosive water tank, an explosive column connected to the crossbeam through a fixed explosive column rod below the middle part of the crossbeam, and a sensor connected to the crossbeam through a fixed sensor rod below each side of the crossbeam; the explosive column and the sensor are located directly above the medium box; the sensor is connected to the data acquisition instrument;

[0012] Further, a scale is arranged on the crossbeam for measuring the distance from the center of the explosive column to the main observation window and adjusting the horizontal position of the explosive column and the sensor; scales are also arranged on the fixed explosive column rod and the fixed sensor rod, respectively, for adjusting the height of the explosive column and the sensor according to the test requirements, so as to adjust their positions relative to the seabed medium.

[0013] Further, the fixed explosive column rod and the fixed sensor rod are both steel pipes, which can ensure that the explosive column and the sensor do not shake, thereby ensuring the relative position between the two.

[0014] According to the above design, the fixed test frame component can ensure that the explosive column and the sensor are accurately arranged at the predetermined position in the explosive water tank, and the explosive column and the sensor do not shake in the water, so that the accuracy of the test measurement result is high.

[0015] Further, the illumination system comprises a xenon lamp with a power of 2000W and a high-power power supply.

[0016] Further, the explosion water tank is a cylindrical structure, the diameter is not less than 1.8 m, the height is not less than 1.8 m, the wall thickness is not less than 30 mm, at least 80 g TNT equivalent explosive explosion test can be carried out, most types of explosives can be completely detonated at this equivalent, more types of explosives can be studied.

[0017] Further, the seabed medium can be mud, silt, fine sand or coarse sand, rock and other seabed bottom; the water source pool is a cylindrical box or a cubic box, different sizes can simulate different thicknesses of seabed bottom; by adjusting the height of the support, the distance between the explosive column and the seabed medium explosion environment can be simulated.

[0018] On the other hand, based on the above near-seabed explosive explosion simulation test device, the application also provides a kind of near-seabed explosive explosion simulation test method, specifically including the following steps:

[0019] Step 1, water is injected into the explosion water tank from the water source pool by the water pump until the water reaches the required position, and then the water pump is closed;

[0020] Step 2, select seabed medium and medium box according to test requirements, fill the medium box with selected seabed medium, ensure the seabed medium is flat, fix the medium box and support by bolts to get the seabed simulation device, use the crane to put the seabed simulation device at the center of the bottom of the explosion water tank;

[0021] Step 3, after the sensor is connected and debugged, it is fixed at the bottom of the fixed sensor rod, the sensor is placed in the specified position in the water through the fixed sensor rod, the actual position of the sensor in the water is determined using the scale on the crossbeam and the fixed sensor rod;

[0022] Step 4: use the fixed column rod as a ruler, start the light source at the auxiliary observation window, adjust the high-speed camera at the main observation window to take the image, make the ruler in the image reach the clearest degree, save the ruler photo;

[0023] Step 5: place the explosive column at the required water depth through the scale on the fixed column rod, measure the distance between the explosive column and the main observation window using the scale on the crossbeam, measure the distance between the high-speed camera lens and the main observation window using the laser range finder, then perform the explosion test to obtain the electric measurement data and the light measurement photo;

[0024] Step 6: after each explosion test, observe the water quality in the explosion water tank, if the photography condition cannot be met, turn off the light source and open the drain valve to drain the water into the drainage pool. After the water is drained, refill the water into the explosion water tank through the water pump and perform the explosion test again;

[0025] Step 7: After the explosion test is completed, open the drain valve to drain the water into the drain tank; process and analyze the electrical measurement data and light measurement photos obtained in step 5.

[0026] Further, in step 2, determining the selection of the seabed medium in the seabed simulation device, the thickness of the seabed medium, and the laying depth of the seabed simulation device includes:

[0027] (1) According to the seabed conditions simulated according to the test requirements, select appropriate seabed medium;

[0028] (2) According to the test requirements and the size of the explosive charge, select a suitable size and depth of the medium box, lay the selected seabed medium, and ensure that the seabed medium covers the medium box and the surface is flat;

[0029] (3) The explosive charge is always placed at the center of the explosion water tank to ensure that it is on the same horizontal line as the high-speed camera and the main observation window. By adjusting the height of the support, the distance D between the charge and the seabed medium is determined.

[0030] Further, in step 3, the operation of determining the actual position of the sensor in the water includes:

[0031] (1) Fix the fixed measurement frame member on the explosion water tank;

[0032] (2) According to the test point position of the sensor, determine the horizontal position of several fixed sensor rods by the scale on the fixed test frame member beam, and install them on the beam;

[0033] (3) According to the test point position of the sensor, adjust the water depth of the fixed sensor rod by the scale on the fixed sensor rod, and then confirm the test position of the sensor;

[0034] (4) The remaining sensors are installed accordingly.

[0035] Further, in step 7, the operation of processing and analyzing the electrical measurement data and light measurement photos obtained in the test includes:

[0036] Step 71, select the photo where the bubble radius reaches the maximum, and obtain the picture radius L of the high-speed photography bubble according to the scale of the photo;

[0037] Step 72, calculate the true maximum radius R of the bubble:

[0038] h1 tan θ1+h2 tan θ2=L

[0039] m1 sin θ1=m2 sin θ2

[0040] m1 sin θ1=m3 sin θ3

[0041] R = L cos θ3

[0042] In the formula:

[0043] h1 is the distance between the high-speed camera lens and the main viewing window;

[0044] h2 is the thickness of the main observation window glass;

[0045] L is the radius of the bubble image captured by the high-speed camera;

[0046] θ1 and θ2 are the angles of incidence and refraction of light at the air-glass interface;

[0047] θ3 is the refraction angle at the glass-water interface;

[0048] m1 is the refractive index of air;

[0049] m2 is the refractive index of plexiglass;

[0050] m3 is the refractive index of water;

[0051] R represents the actual radius of the bubble being photographed.

[0052] Compared to existing technologies, the intended effects of this invention are as follows:

[0053] This invention constructs a simulated explosion environment for explosive charges in different seabed media and at varying distances from the seabed using an exploding water tank, solving the problems of sensor and explosion center positioning, and precise positioning of the sensor and simulated seabed device in underwater shock wave pressure measurement. This invention is low-cost, easy to operate, highly efficient and safe, yields parameters with high similarity to actual values, and provides accurate and reliable results, making it suitable for near-seabed explosive explosion simulation testing. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the near-seabed explosive explosion simulation test device of the present invention;

[0055] Figure 2 Assembly drawing for fixed test architecture components;

[0056] Figure 3 This is a schematic diagram of the components in the fixed test structure; where (a) is the crossbeam, (b) is the fixed charge rod, (c) is the fixed sensor rod, and (d) is the fixed nut.

[0057] Figure 4 This is a schematic diagram showing the fixed positions of the explosive charge and the two sensor measuring points in Example 1;

[0058] Figure 5 This is a schematic diagram showing the fixed positions of the explosive charge and the two sensor measuring points in Example 2.

[0059] Figure 6 This is a schematic diagram showing the fixed positions of the explosive charge and two sensor measuring points in Example 3. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of protection thereof.

[0061] Example 1:

[0062] This embodiment provides a near-seabed explosive explosion simulation device and testing method, including an explosive charge 14, an explosive water tank 1, a seabed simulation device, an optical measurement system, an electrical measurement system, a fixed test structure, and a lighting system;

[0063] The explosion water tank 1 is located on the ground, and its inner wall is provided with a foam rubber shock-absorbing layer 2. One side of the bottom of the explosion water tank 1 is connected to the drainage pool 7 through a drain pipe 5, and a drain valve 6 is installed on the drain pipe 5. The other side is connected to the water source pool 4 through a water pump 3. Three observation windows are evenly distributed in the middle of the explosion water tank 1, namely one main observation window 11 and two secondary observation windows. A light measurement system is installed outside the main observation window, and lighting devices are installed outside the two secondary observation windows.

[0064] The seabed simulation device includes a medium tank 9 mounted on a support 10, which contains seabed medium 8.

[0065] The optical measurement system includes a high-speed camera 12 and a computer;

[0066] The electrical measurement system includes a sensor 15 and a data acquisition instrument 16 installed outside the explosion water tank 1;

[0067] The fixed test structure is fixed to the exploding water tank 1, such as... Figure 2 , Figure 3 As shown, the device includes a crossbeam 13 fixed inside the upper part of the explosive water tank 1. An explosive charge 14 is connected to the lower part of the middle of the crossbeam 13 via a fixed charge rod 19. A sensor 15 is connected to the lower part of the crossbeam 13 on both sides of the fixed charge rod 19 via a fixed sensor rod 20. The explosive charge 14 and the sensor 15 are both located directly above the medium tank 9. The sensor 15 is connected to a data acquisition instrument 16 installed outside the explosive water tank 1.

[0068] The crossbeam 13 is equipped with a scale for measuring the distance from the center of the explosive charge 14 to the main observation window 11, and for adjusting the horizontal position of the explosive charge 14 and the sensor 15. The fixed charge rod 19 and the fixed sensor rod 20 are also equipped with scales for adjusting the height of the explosive charge 14 and the sensor 15 according to the test requirements, thereby adjusting their position relative to the seabed medium 8.

[0069] The propellant column 14 selects a mass of 5.4g of TNT propellant column Φ16*17mm, the water depth is 90cm, the seabed medium 8 is soil, the internal volume of the medium box 9 is 80cm*80cm*30cm, the wall thickness is 3mm, the height of the support 10 is 59.7cm or 46.7cm or 33.7cm, the distance D between the explosive propellant column 14 and the seabed medium 8 is 0cm, 13cm (0.5 times the maximum bubble radius of the 5.4g TNT free field), 26cm (1 times the maximum bubble radius of the 5.4g explosive free field); the water shock wave characteristics and the load law of two points 40cm away from the center of the explosive propellant column 14 in the horizontal 30° and 60° directions are respectively explored.

[0070] As shown in Figure 2 , the fixed propellant column rod 19 is inserted into the water from the center hole of the cross beam 13, the water depth of the explosive propellant column 14 is adjusted through the scale on the steel pipe 19, and it is ensured that the distance from the soil medium surface is 0cm; two fixed sensors 15 are inserted from the guide groove of the cross beam 13, as shown in Figure 4 , according to the measuring point position of working condition 1, the horizontal positions of measuring point 1 and measuring point 2 are respectively adjusted and determined through the scale on the cross beam 13, the horizontal position of measuring point 1 is located at the right side of the center of the cross beam 13 by 34.64cm, then the water depth of measuring point 1 is adjusted and determined to be 70.00cm through the scale on the fixed sensor rod 20, and the water position of measuring point 2 is determined in the same way.

[0071] Table 1: Explosive amount 5.4g soil seabed medium near seabed explosion simulation working condition table

[0072]

[0073] Table 2: Explosive amount 5.4g soil seabed medium near seabed explosion simulation working condition test data table

[0074]

[0075] Example 2:

[0076] The embodiment is a near seabed explosive explosion simulation device and test method, which comprises an explosive propellant column 14, an explosive water tank system, a seabed simulation device, an optical measurement system, a fixed test frame component, an electrical measurement system and an illumination system;

[0077] The explosion water tank 1 is located on the ground, and the inner wall of the explosion water tank 1 is provided with a foam rubber damping layer 2; the bottom of the explosion water tank 1 is connected to the drainage tank 7 through the drainage pipe 5, the drainage valve 6 is installed on the drainage pipe 5, and the other side is connected to the water source tank 4 through the water pump 3; the seabed simulation device is composed of a seabed medium 8, a medium box 9 and a support 10; three observation windows are uniformly distributed in the middle of the explosion water tank 1, which are one main observation window 11 and two auxiliary observation windows, and the optical measurement system is arranged outside the main observation window, and the illumination device is arranged outside the two auxiliary observation windows.

[0078] The light measurement system comprises a high-speed photographic camera 12 and a computer;

[0079] The electric measurement system comprises sensors 15 and a data acquisition instrument 16 arranged outside the explosion water tank 1;

[0080] The fixed test frame member is fixed on the explosion water tank 1, comprising a crossbeam 13 fixed in the upper part of the explosion water tank 1, an explosive column 14 connected through a fixed column rod 19 below the middle part of the crossbeam 13, and a sensor 15 connected through a fixed sensor rod 20 below the crossbeam 13 on both sides of the fixed column rod 19; the explosive column 14 and the sensor 15 are both located directly above the medium box 9; the dimensions of the crossbeam 19, the fixed column rod 19 and the fixed sensor rod 20 are all marked, and the positions of the explosive column 14 and the sensor 15 in water can be adjusted according to the test requirements;

[0081] The lighting device is composed of a xenon lamp 17 with a power of about 2000W and a high-power power supply 18; after the explosive column 14 and the sensor 15 are installed in place, their exact positions are determined by adjusting the scales on the fixed test frame crossbeam 13 and the fixed column rod 19 and the fixed sensor rod 20.

[0082] A Φ20×20mm TNT column with a mass of 10g is selected as the explosive column 14, the water depth is 90cm, the seabed medium 8 is fine sand, the internal volume of the medium box 9 is 80cm×80cm×30cm, the wall thickness is 3mm, the support height is 59.7cm or 43.7cm or 27.7cm, and the distance D between the explosive column 14 and the seabed medium is 0cm, 16cm (about 0.5 times the maximum bubble radius of the 10g TNT free field), and 32cm (about 1 times the maximum bubble radius of the 10g explosive free field); the characteristics of the water shock wave and the load at two points 50cm away from the center of the explosive column 14 in the horizontal directions of 25° and 65° are respectively explored.

[0083] The fixed measurement frame member can ensure that the explosive column 14 and the sensor 15 are accurately arranged at the predetermined positions in the water tank 1, and the explosive column 14 and the sensor 15 will not sway in water, thereby ensuring the accuracy of the test measurement results. Figure 2 As shown in Figure 5 As shown in

[0084] Table 3 Explosive amount 10g fine sand seabed medium offshore bottom explosion simulation working condition data

[0085]

[0086] Example 3:

[0087] The embodiment is an offshore bottom explosive explosion simulation test device and test method, which comprises an explosive charge 14, an explosive water tank system, a seabed simulation device, a light measurement system, a fixed test frame component, an electric measurement system, and an illumination system.

[0088] The explosive water tank system comprises an explosive water tank 1 arranged on the ground, and a foam rubber damping layer 2 arranged on the inner wall of the explosive water tank 1. One side of the bottom of the explosive water tank 1 is connected to a drainage pool 7 through a drainage pipe 5, and a drainage valve 6 is arranged on the drainage pipe 5. The other side is connected to a water source pool 4 through a water pump 3. The seabed simulation device comprises a seabed medium 8, a medium box 9, and a support 10. Three observation windows are arranged in the middle of the explosive water tank 1, which are one main observation window 11 and two auxiliary observation windows. The light measurement system is arranged outside the main observation window, and the illumination system is arranged outside the two auxiliary observation windows.

[0089] The light measurement system comprises a high-speed photographic camera 12 and a computer.

[0090] The fixed test frame component is fixed on the explosive water tank 1 and comprises a crossbeam 13 fixed on the upper part of the explosive water tank 1. The explosive charge 14 is connected to the crossbeam 13 through a fixed charge rod 19 arranged below the middle part of the crossbeam 13. A sensor 15 is arranged below the crossbeam 13 on both sides of the fixed charge rod 19. The explosive charge 14 and the sensor 15 are arranged above the medium box 9. The crossbeam 19, the fixed charge rod 19, and the fixed sensor rod 20 are all provided with size scales. The positions of the charge and the sensor in water can be adjusted according to the test requirements. The sensor is connected to the external electric measurement system.

[0091] The electric measurement system comprises the sensor 15 and a data acquisition instrument 16 arranged outside the explosive water tank 1.

[0092] The illumination device comprises a xenon lamp 17 with a power of about 2000W and a high-power power supply 18. After the positions of the explosive charge 14 and the sensor 15 are adjusted, the exact positions thereof are determined through the scales arranged on the fixed test frame crossbeam 13 and the fixed charge rod 19 and the fixed sensor rod 20.

[0093] Select the quality of the column 14 20g of Φ25*26mm TNT column, into the water depth of 90cm, seabed medium 8 is coarse sand, medium box 9 internal volume is 80cm*80cm*30cm, wall thickness 3mm, support height 59.7cm or 39.2cm or 18.7cm, explosive column 14 and seabed medium distance D is 0cm, 20.5cm (about 0.5 times 10g TNT free field maximum bubble radius), 41cm (about 1 times 10g explosive free field maximum bubble radius); respectively explore the 2 points in the water shock wave characteristics and load law of 50cm from the center of explosive column 14 horizontal 15°, 75° direction.

[0094] Fixed measurement frame components can ensure accurate explosive column 14 and sensor 15 arranged in the predetermined position in the water tank 1, and explosive column 14 and sensor 15 will not be shaken in the water, thereby ensuring the accuracy of the test results. As shown in Figure 2 The fixed column rod is inserted into the water from the center hole of the beam 13, the water depth of the explosive column 14 is adjusted by the scale on the steel pipe, and the distance from the soil medium surface is ensured to be 0cm; two fixed sensors 15 are inserted from the beam 13 guide groove, as shown in Figure 6 The horizontal position of the measuring point 1 and the measuring point 2 is adjusted by the scale on the beam 13, the horizontal position of the measuring point 1 is located at the right side of the center of the beam 13 by 48.22cm, then the water depth of the measuring point 1 is adjusted by the scale on the fixed sensor rod, and the water depth of the measuring point 2 is determined in the same way.

[0095] Table 4 explosive amount 10g coarse sand seabed medium near seabed explosion simulation working condition data

[0096]

[0097] In summary, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An offshore bottom simulating explosive test device, characterized by, The explosion water tank system, the seabed simulation device, the light measuring system, the electric measuring system, the fixed test frame member, and the lighting system are included. The explosion water tank system includes an explosion water tank (1) arranged on the ground, and a foam rubber damping layer (2) arranged on the inner wall of the explosion water tank (1); one side of the bottom of the explosion water tank (1) is connected to a drainage pool (7) through a drainage pipe (5), and a drainage valve (6) is arranged on the drainage pipe (5); the other side of the bottom of the explosion water tank (1) is connected to a water source pool (4) through a water pump (3); three observation windows are arranged in the middle of the explosion water tank (1), including one main observation window (11) and two auxiliary observation windows, and a light measuring system is arranged outside the main observation window, and a lighting system is arranged outside the two auxiliary observation windows. The seabed simulation device includes a medium box (9) arranged on a support (10), and a seabed medium (8) arranged in the medium box (9). The light measuring system includes a high-speed camera (12) and a computer. The electric measuring system includes a sensor (15) and a data acquisition instrument (16) arranged outside the explosion water tank (1). The fixed test frame member is fixed on the explosion water tank (1) and includes a crossbeam (13) fixed on the upper portion of the explosion water tank (1), an explosive column (14) connected to the fixed explosive column rod (19) arranged below the middle portion of the crossbeam (13), and a sensor (15) connected to the fixed sensor rod (20) arranged below the crossbeam (13) on both sides of the fixed explosive column rod (19); the explosive column (14) and the sensor (15) are located directly above the medium box (9); and the sensor (15) is connected to the data acquisition instrument (16).

2. The offshore sub-bottom explosive emulational test apparatus as claimed in claim 1, wherein The crossbeam (13) is provided with a scale; and the fixed explosive column rod (19) and the fixed sensor rod (20) are also respectively provided with scales.

3. The offshore sub-bottom explosive emulational test device as claimed in claim 1, wherein, The fixed explosive column rod (19) and the fixed sensor rod (20) are both steel pipes.

4. The offshore sub-bottom explosive emulational test apparatus as claimed in claim 1, wherein The lighting system includes a xenon lamp (17) with a power of 2000W and a high-power power supply (18).

5. The offshore sub-bottom explosive emulational test device as claimed in claim 1, wherein, The explosion water tank (1) has a cylindrical structure, and has a diameter of not less than 1.8m, a height of not less than 1.8m, and a wall thickness of not less than 30mm, and can be used for explosive explosion test of at least 80g TNT equivalent.

6. The offshore sub-bottom explosive emulational test device as claimed in claim 1, wherein, The seabed medium (8) is soil, silt, fine sand, coarse sand, or rock.

7. A method of testing a simulation of an offshore bottom charge explosion, characterized by, The offshore explosive explosion simulation test device according to any one of claims 1, specifically includes the following steps: Step 1, water is injected into the explosion water tank (1) from the water source pool (4) through the water pump (3) until the water reaches the required position, and then the water pump (3) is closed; Step 2, the seabed medium (8) and the medium box (9) are selected according to the test requirements, the selected seabed medium (8) is filled in the medium box (9), the seabed medium is laid flat, the seabed simulation device is obtained by fixing the medium box (9) and the support (10), and the seabed simulation device is placed at the center position of the bottom of the explosion water tank (1); Step 3, after the sensor (15) is connected and debugged, the sensor (15) is fixed at the bottom of the fixed sensor rod (20), the sensor (15) is placed in the specified position in the water through the fixed sensor rod (20), and the actual position of the sensor (15) in the water is determined by using the scales on the crossbeam (13) and the fixed sensor rod (20). Step 4: Take the fixed charge column rod (19) as a ruler, start the light source (17) at the auxiliary observation window, adjust the high-speed camera (12) at the main observation window (11) to take the image so that the ruler is the sharpest in the image, and save the ruler photo; Step 5: Place the explosive column (14) at the required water depth of the test by the scale on the fixed charge column rod (19), measure the distance between the explosive column (14) and the main observation window (11) by the scale on the crossbeam (13), measure the distance between the lens of the high-speed camera (12) and the main observation window (11) by the laser range finder, and then perform the explosion test to obtain the electric measurement data and the light measurement photo; Step 6: After each explosion test, observe the water quality in the explosion water tank (1), close the light source (17), open the drain valve (6), and drain the water into the drain tank (7); after the water is drained, refill the water into the explosion water tank (1) by the water pump (3), and then perform the explosion test; Step 7: After the explosion test, open the drain valve (6) to drain the water into the drain tank (7); process and analyze the electric measurement data and the light measurement photo obtained in step 5.

8. The method of claim 7, wherein the explosive is a water gel explosive. In step 2, the selection of the seabed medium (8), the thickness of the seabed medium (8), and the depth of the seabed simulation device are determined, including: (1) selecting a suitable seabed medium (8) according to the simulated seabed situation required by the test; (2) selecting a suitable size and depth of the medium box (9) according to the size of the explosive column (14) and the test requirements, laying the selected seabed medium (8), and ensuring that the seabed medium (8) covers the medium box (9) and the surface is flat; (3) always placing the explosive column (14) at the center of the explosion water tank (1) to ensure that the high-speed camera (12) and the main observation window are on the same horizontal line, and determining the distance D between the explosive column and the seabed medium (8) by adjusting the height of the support (10).

9. The method of claim 7, wherein, In step 3, the operation of determining the actual position of the sensor (15) in the water includes: (1) fixing the fixed measurement frame member on the explosion water tank (1); (2) determining the horizontal positions of several fixed sensor rods (20) according to the test point positions of the sensors and installing them on the crossbeam (13) by the scale on the crossbeam (13) of the fixed test frame member; (3) adjusting the water entry depth of the fixed sensor rod (20) according to the test point positions of the sensors by the scale on the fixed sensor rod (20), and then confirming the test position of the sensor 15; (4) installing the remaining sensors (15) accordingly.

10. The method of claim 7, wherein, In step 7, the operation of processing and analyzing the electric measurement data and the light measurement photo obtained in the test includes: Step 71: selecting the photo with the largest bubble radius, and obtaining the picture radius L of the high-speed camera bubble according to the scale of the ruler photo; Step 72: calculating the true maximum radius R of the bubble: h1tanθ1+h2tanθ2=L m1sinθ1=m2sinθ2 m1sinθ1=m3sinθ3 R=L cosθ3 wherein: h1 is the distance between the lens of the high-speed camera and the main observation window; h2 is the main observation window glass thickness; L is the picture radius of the high-speed camera shooting the bubble; θ1, θ2 are the angles of incidence and refraction of light at the air-glass interface; θ3 is the refraction angle at the glass-water interface; m1 is the refractive index of air; m2 is the refractive index of organic glass; m3 is the refractive index of water; R is the real radius of the bubble shot.

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