An apparatus and method for adjusting the floating state of a damaged model in an underwater explosion test.

Abstract

This invention discloses an apparatus and method for adjusting the buoyancy of a damaged underwater explosion test model. The invention comprises an internal buoy and an external buoy box. The internal buoy is filled into an additional compartment of the damaged test model, and the external buoy box is located outside the damaged test model. Buoyancy is provided by the internal buoy and the external buoy box. The buoyancy is adjusted by adjusting the installation position of the external buoy box and the amount of water injected into the compartment of the external buoy box, so that the damaged test model is suitable for underwater explosion secondary damage tests.

Description

Technical Field

[0001] This invention relates to the field of underwater explosion testing, and in particular to a device and method for adjusting the floating state of a damaged model in an underwater explosion test. Background Technology

[0002] Ships suffer varying degrees of damage when attacked by underwater weapons such as torpedoes, with severe explosive loads even causing them to break apart or sink. Therefore, research on improving the blast and impact resistance of ships is of great significance. Among the three methods—theoretical research, experimental research, and numerical simulation—experimental research is the most direct and accurate approach. Therefore, conducting numerous scaled-down models or full-scale underwater explosion tests is crucial for studying the impact resistance of surface ships.

[0003] In terms of experimental research, current research mainly focuses on single-shot underwater explosion tests. However, with the improvement of ship protection capabilities, a single torpedo hit is unlikely to cause fatal damage to a ship in actual combat. Therefore, research on secondary damage to surface ships has gradually become a hot topic. During the test, the model is subjected to the strong blast wave load and bubble pulsation load of the first-shot weapon, which usually causes large local breaches, resulting in water ingress into the compartment, changes in buoyancy, and making it impossible to accurately conduct underwater explosion secondary damage tests in the designed state. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for adjusting the floating state of a damaged underwater explosion test model, so as to adjust the floating state of the damaged test model and make it suitable for underwater explosion secondary damage tests.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A device for adjusting the buoyancy of a damaged model in an underwater explosion test, the device comprising: an internal buoy and an external buoy box;

[0007] The internal buoy is located in the additional compartment of the test damage model, and the external buoy is located outside the test damage model; the test damage model is a scaled-down model of the ship after an underwater explosion test.

[0008] The internal buoy is used to provide a first buoyancy, and the external buoy is used to provide a second buoyancy. The sum of the first buoyancy and the second buoyancy is equal to the sum of the weights of the internal buoy, the external buoy, and the test failure model.

[0009] The buoyancy of the test damage model is adjusted by changing the installation position of the external buoy outside the external buoy and by adjusting the water injection volume of each compartment inside the external buoy.

[0010] Optionally, there may be multiple internal pontoons, which are fixed to the inner wall of the additional compartment of the test damage model by being swapped after being fixed in place.

[0011] Optionally, the internal pontoons are secured with wire mesh.

[0012] Optionally, the external pontoon includes: a closed box structure formed by a pontoon upper plate, a pontoon lower plate and four pontoon side plates, multiple connecting plates and a preset number of pontoon partitions;

[0013] Multiple connecting plates are evenly arranged on the side plate of the float facing the test damage model. One end of the connecting plate is welded to the side plate of the float facing the test damage model, and the other end of the connecting plate is welded to the outer plate of the test damage model.

[0014] A predetermined number of the floating box partitions are installed inside the enclosed box structure, and the predetermined number of the floating box partitions divide the interior of the enclosed box structure into multiple compartments.

[0015] Optionally, the number of the floating box partitions is three. The three floating box partitions include one transverse partition and two longitudinal partitions. The two longitudinal partitions are both arranged perpendicularly to the transverse partition and are arranged perpendicularly to each other. The three floating box partitions divide the interior of the enclosed box structure into eight compartments.

[0016] Optionally, the four corners of the upper plate of the pontoon are provided with through holes that communicate with the four upper compartments;

[0017] The lower plate of the pontoon has through holes at its four corners that communicate with the four lower compartments.

[0018] The four corners of the transverse partition are respectively provided with through holes connecting the upper compartment and the lower compartment;

[0019] The through-hole is used to adjust the amount of water injected into the cabin.

[0020] Optionally, the upper plate of the pontoon, the lower plate of the pontoon, the side plate of the pontoon, the connecting plate, and the partition plate of the pontoon are all provided with reinforcing ribs.

[0021] Optionally, the number of external pontoons is less than or equal to 4.

[0022] A method for adjusting the floating state of a damaged model in an underwater explosion test, the method being applied to the aforementioned apparatus, the method comprising the following steps:

[0023] Determine the first number of internal pontoons and the second number of external pontoons, such that the sum of the first buoyancy provided by all internal pontoons and the second buoyancy provided by all external pontoons is equal to the sum of the weights of all internal pontoons, all external pontoons, and the test failure model;

[0024] The first number of internal pontoons is placed in the additional compartment of the test failure model, and the second number of external pontoons is placed in the initially determined installation position outside the test failure model to obtain the overall test device;

[0025] The lateral and longitudinal moments of inertia of the external pontoons are determined based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship.

[0026] The stability parameters of the overall test device are calculated based on the overall buoyancy, center of buoyancy position, center of mass position of the overall test device, and the lateral and longitudinal moments of inertia of the external buoys.

[0027] When the stability parameters do not meet the preset stability conditions, adjust the installation position of the second external buoy outside the test failure model and the water volume in the compartment of the external water tank, and return to the step "determine the lateral moment of inertia and longitudinal moment of inertia of the external buoy based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship", until the stability parameters meet the preset stability conditions.

[0028] Optionally, the stability parameters include the transverse and longitudinal metacentric radius, transverse and longitudinal metacentric height of the overall test device. The calculation of the stability parameters of the overall test device based on the overall buoyancy, center of buoyancy position, center of mass position, and the transverse and longitudinal moments of inertia of the external buoyancy tanks specifically includes:

[0029] Based on the overall buoyancy W of the overall test setup and the lateral moment of inertia I of the external pontoon... T The radius BM of the transverse epicenter of the overall test setup is calculated as follows:

[0030] Based on the overall buoyancy W of the overall test setup and the longitudinal moment of inertia I of the external pontoon... L Calculate the longitudinal geocentric radius BM of the overall test setup. L for:

[0031] Based on the positions of the center of buoyancy, center of mass, and transverse metacenter radius BM of the overall test setup, the transverse metacenter height GM of the overall test setup is calculated as: GM = BM + CZ; where C is the longitudinal position of the center of buoyancy and Z is the longitudinal position of the center of mass.

[0032] Based on the position of the center of buoyancy, the position of the center of mass, and the longitudinal radius of the stabilizer of the overall test apparatus. L Calculate the longitudinal height GM of the overall test setup. L For: GM L =BM L +CZ.

[0033] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0034] This invention discloses an apparatus and method for adjusting the buoyancy of a damaged underwater explosion test model. The invention includes an internal buoy and an external buoy box. The internal buoy is installed in an additional compartment of the damaged test model, and the external buoy box is located outside the damaged test model. Buoyancy is provided by the internal buoy and the external buoy box. The buoyancy is adjusted by adjusting the installation position of the external buoy box and the amount of water injected into the compartment inside the external buoy box, so that the damaged test model is suitable for underwater explosion secondary damage tests. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A three-dimensional structural schematic diagram of a device for adjusting the floating state of a damaged model in an underwater explosion test, provided in an embodiment of the present invention;

[0037] Figure 2 This is a front view of a device for adjusting the floating state of a damaged model in an underwater explosion test, provided by an embodiment of the present invention.

[0038] Figure 3 This is a side view of a device for adjusting the floating state of a damaged model in an underwater explosion test, provided in an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram of the internal pontoon installation provided in an embodiment of the present invention;

[0040] Figure 5 A three-dimensional structural diagram of the external pontoon provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the internal structure of the external pontoon provided in an embodiment of the present invention;

[0042] Figure 7 A top view of the external pontoon provided in an embodiment of the present invention;

[0043] Figure 8 A flowchart illustrating an adjustment method for a device used for adjusting the floating state of a damaged model in an underwater explosion test, provided by an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Side plate of the pontoon; 2. Connecting plate; 3. Partition plate of the pontoon; 4. Reinforcing rib; 5. Water injection hole; 6. Drainage hole; 7. External pontoon; 8. Test failure model; 9. Internal pontoon; 10. Upper plate of the pontoon; 11. Lower plate of the pontoon. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The purpose of this invention is to provide an apparatus and method for adjusting the floating state of a damaged underwater explosion test model, so as to adjust the floating state of the damaged test model and make it suitable for underwater explosion secondary damage tests.

[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] Example 1

[0053] like Figures 1-7 As shown, Embodiment 1 of the present invention provides a device for adjusting the buoyancy of a damaged underwater explosion test model, including a damaged test model 8, several sets of internal buoys 9 and several external buoy boxes 7. The several sets of internal buoys 9 are filled in the additional compartments of the damaged test model 8, and the several sets of internal buoys 9 are fixed to the outer plate and bulkhead of the damaged test model 8. This can be achieved by fixing the several sets of internal buoys 9 with wire mesh and then fixing them to the outer plate and bulkhead of the damaged test model 8 with lifting rings; it can stably fix several (dozens or hundreds) standard internal buoys 9 in the corresponding positions of the damaged test model 8.

[0054] Several external pontoons 7 are arranged outside the test failure model 8, and the number of external pontoons 7 does not exceed four. The external pontoons 7 are connected to the outer plate of the test failure model 8 through several connecting plates 2.

[0055] The external pontoon 7 includes pontoon side plates 1, pontoon partitions 3, pontoon upper plates 10, and pontoon lower plates 11. The pontoon upper plates 10, lower plates 11, and four pontoon side plates 1 form a closed box structure. Several pontoon partitions 3 are provided, and the interior of the closed box structure is divided into multiple compartments by the longitudinal and transverse arrangement of the pontoon partitions 3. Through holes are opened on the transversely arranged pontoon partitions 3, as well as the pontoon upper plates 10 and lower plates 11. The overall center of mass and center of buoyancy of the model are adjusted by injecting water into different compartments inside the external pontoon 7.

[0056] The test failure model 8, with internal pontoons 9 and external pontoons 7 installed, meets the floating balance and stability requirements of the corresponding ship type.

[0057] Several connecting plates 2 are evenly arranged on the side plate 1 of the floating box facing the test damage model 8. One end of each connecting plate 2 is fixed to the side plate 1 of the floating box facing the test damage model 8, and the other end is fixed to the outer plate of the test damage model 8. Specifically, one end of each connecting plate 2 is welded to the side plate 1 of the floating box facing the test damage model 8, and the other end is welded to the outer plate of the test damage model 8. The welding connection ensures a stable connection between the external floating box 7 and the test damage model 8.

[0058] The external pontoon 7 is equipped with three pontoon partitions 3: one transverse partition and two longitudinal partitions. The two longitudinal partitions are arranged vertically, and both longitudinal partitions are arranged perpendicularly to the transverse partition. The three pontoon partitions 3 divide the enclosed box structure into eight compartments. Through holes communicating with the corresponding compartments are opened at the four corners of the upper pontoon plate 10 and the lower pontoon plate 11. Through holes communicating with the upper and lower compartments are also opened at the four corners of the transverse partition. Specifically, the through holes opened on the upper pontoon plate 10 can be water injection holes 5, and the through holes opened on the lower pontoon plate 11 can be drainage holes 6. All through holes are circular holes, which are used to inject or drain water into the corresponding compartments. By injecting water into different compartments in the external pontoon 7, the center of mass and center of buoyancy of the test failure model 8, the internal pontoon 9, and the external pontoon 7 can be adjusted, which facilitates the adjustment of the floating state and the steady state.

[0059] Each plate of the external pontoon 7 is provided with reinforcing ribs 4, which strengthen the structure of the external pontoon 7.

[0060] Example 2

[0061] Embodiment 2 of the present invention provides a method for adjusting the floating state of a damaged model in an underwater explosion test. The method is applied to the above-mentioned device and includes the following steps:

[0062] Determine the first number of internal pontoons and the second number of external pontoons, such that the sum of the first buoyancy provided by all internal pontoons and the second buoyancy provided by all external pontoons equals the sum of the weights of all internal pontoons, all external pontoons, and the test failure model.

[0063] The first number of internal pontoons is placed in the additional compartment of the test failure model, and the second number of external pontoons is placed in the initially determined installation position outside the test failure model to obtain the overall test device.

[0064] The lateral and longitudinal moments of inertia of the external pontoons are determined based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship.

[0065] The stability parameters of the overall test device are calculated based on the overall buoyancy, center of buoyancy, center of mass, and the lateral and longitudinal moments of inertia of the external buoyancy box.

[0066] When the stability parameters do not meet the preset stability conditions, adjust the installation position of the second external buoy outside the test failure model and the water volume in the compartment of the external water tank, and return to the step "determine the lateral moment of inertia and longitudinal moment of inertia of the external buoy based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship", until the stability parameters meet the preset stability conditions.

[0067] For example, such as Figure 8 As shown, the method specifically includes:

[0068] Step 1: Calculate the mass M0 and center of mass (X0, Y0, Z0) of the undamaged test model. Set the waterline of the secondary damage model. The waterline of the secondary damage model should be the same as that of the undamaged test model. The waterline refers to the draft of the ship, that is, the depth of the ship hull below the water surface when the ship is floating on the water.

[0069] Step 2: Based on the waterline of the secondary damage model and the damage condition of the test damage model after the first test, fill the additional compartment with internal floats 9, and fix them as a whole with wire mesh and weld them to the outer plate and bulkhead of the test damage model 8. Record the mass M1, center of mass and buoyancy position (X1,Y1,Z1) of all internal floats in each compartment, and the buoyancy W1 provided.

[0070] Step 3: Based on the positions of the center of mass and center of buoyancy of the internal pontoons determined in Step 2, and according to the actual damage and dimensions of the test failure model 8, determine the number and size of the external pontoons 7. Perform structural design and strength verification for the external pontoons 7. After initially determining the installation position of the external pontoons 7, calculate the mass M2 of the external pontoons, the position of the center of mass (X2, Y2), and the lateral moment of inertia I of the area of ​​the external pontoons 7 at the waterline about the longitudinal central axis. T The longitudinal moment of inertia I of the area of ​​the external pontoon 7 at the waterline about the transverse central axis. L The specific expression is as follows:

[0071] The transverse moment of inertia of the area at the waterline about the longitudinal central axis

[0072] Longitudinal moment of inertia of the area at the waterline about the transverse central axis

[0073] In the above formula, L is the total length of the experimental damage model 8, dx is the micro-segment selected along the ship's length direction, and x and y represent the variables in the ship's length direction and ship's width direction, respectively.

[0074] Step 4: Determine the overall mass M of the test damaged model, internal pontoon and external pontoon, where M = M0 + M1 + M2. To ensure the buoyancy of the model, the overall mass M needs to be equal to the buoyancy W provided by the internal pontoon and external pontoon. From this, the required buoyancy W2 provided by the external pontoon is obtained, where W2 = M - W1. Combined with the waterline of the secondary damaged model, determine the installation depth of the external pontoon, and obtain the final centroid position (X2, Y2, Z2) and buoyancy center position (A2, B2, C2) of the external pontoon.

[0075] At this point, the overall mass M of the damaged test model, the internal pontoon, and the external pontoon are equal to the buoyancy W, and the model is in equilibrium. Based on the aforementioned center of mass positions of the test model (X0,Y0,Z0), the internal pontoon (X1,Y1,Z1), and the external pontoon (X2,Y2,Z2), the overall center of mass (X,Y,Z) and center of buoyancy (A,B,C) are calculated.

[0076] Step 5: Adjust for stability:

[0077] Based on the aforementioned test failure model, the overall buoyancy W of the internal pontoon and external pontoon, the positions of the center of buoyancy (A, B, C), the positions of the center of mass (X, Y, Z), and the moment of inertia I... T I L Data is used to calculate the overall transverse and longitudinal geocentric radii BM of the model at the current external pontoon installation position. L ,in BM calculations are based on the assumption of an equal-volume inclined waterline under small angle conditions. Horizontal stability center height GM, GM = BM + CZ, vertical stability center height GM L GM L =BM L +CZ, if the relevant regulations for the current ship type are met, that is, the stability requirements are met; for example, the stability requirements for transverse metacentric height are shown in Table 1:

[0078] Table 1 Stability requirements for transverse epicenter height

[0079]

[0080] Generally, the longitudinal metacenter height is on the same order of magnitude as the ship's length. Except for special vessels such as floating cranes, longitudinal stability is generally not a concern. The stability requirements for the longitudinal metacenter height can be set by simply setting the range of values ​​for the longitudinal metacenter height as needed, which will not be elaborated here.

[0081] If the requirements are not met, steps 2-5 need to be repeated to calculate buoyancy and stability by adjusting the installation position of the external pontoon and the water volume in different compartments of the external pontoon, until both buoyancy and stability meet the requirements. At this point, the installation position of the external pontoon is determined.

[0082] In summary, compared with the prior art, the beneficial effects of the device and method for adjusting the floating state of a damaged model in an underwater explosion test provided by the embodiments of the present invention are:

[0083] (1) The present invention provides a device for adjusting the buoyancy of a damaged underwater explosion test model. Through the simultaneous action of internal buoys and external buoy boxes, it provides reserve buoyancy and stability adjustment space for the damaged model (test damaged model). The internal buoys are easy to fill and the number is controllable. The filling quantity and position can be flexibly changed according to buoyancy requirements. The external buoy boxes are easy to install. They are rigidly connected to the test damaged model through connecting plates, which facilitates adjustment of the installation position as needed under different test conditions.

[0084] (2) The present invention provides a device for adjusting the floating state of a damaged model in an underwater explosion test. The external pontoon is a multi-chamber structure with through holes for water injection and drainage. The overall center of mass and center of buoyancy of the model can be adjusted by injecting water into different chambers in the external pontoon, which facilitates the adjustment of the floating state and steady state.

[0085] (3) The present invention provides a device for adjusting the floating state of a damaged model in an underwater explosion test. Both the internal float and the external buoy can be reused, saving costs.

[0086] (4) The present invention provides a device for adjusting the floating state of a damaged underwater explosion test model. The device adjusts the floating state of the damaged test model to ensure that its buoyancy and stability meet the requirements of subsequent tests. This is of great significance for carrying out research on secondary damage tests of underwater explosions.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0088] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for adjusting the floating state of a damaged model in an underwater explosion test, characterized in that, The method is applied to a device for adjusting the buoyancy of a damaged model in an underwater explosion test, the device comprising: an internal buoy and an external buoy box; The internal buoy is located in the additional compartment of the test damage model, and the external buoy is located outside the test damage model; the test damage model is a scaled-down model of the ship after an underwater explosion test. The internal buoy is used to provide a first buoyancy, and the external buoy is used to provide a second buoyancy. The sum of the first buoyancy and the second buoyancy is equal to the sum of the weights of the internal buoy, the external buoy, and the test failure model. The buoyancy of the test model is adjusted by adjusting the installation position of the external buoy outside the test model and adjusting the water injection volume of each compartment inside the external buoy. The method includes the following steps: Determine the first number of internal pontoons and the second number of external pontoons, such that the sum of the first buoyancy provided by all internal pontoons and the second buoyancy provided by all external pontoons is equal to the sum of the weights of all internal pontoons, all external pontoons, and the test failure model; The first number of internal pontoons is placed in the additional compartment of the test failure model, and the second number of external pontoons is placed in the initially determined installation position outside the test failure model to obtain the overall test device; The lateral and longitudinal moments of inertia of the external pontoons are determined based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship. The stability parameters of the overall test device are calculated based on the overall buoyancy, center of buoyancy position, center of mass position of the overall test device, and the lateral and longitudinal moments of inertia of the external buoys. When the stability parameters do not meet the preset stability conditions, adjust the installation position of the second external buoy outside the test failure model and the water volume in the compartment of the external water tank, and return to the step "Determine the lateral moment of inertia and longitudinal moment of inertia of the external buoy based on the waterline of the test failure model; the waterline of the test failure model is consistent with the waterline of the scaled-down model of the undamaged ship", until the stability parameters meet the preset stability conditions.

2. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 1, characterized in that, The number of internal pontoons is multiple, and after the multiple internal pontoons are fixed, they are fixed to the inner wall of the additional compartment of the test damage model by being swapped.

3. The method for adjusting the buoyancy of a damaged model in an underwater explosion test according to claim 2, characterized in that, The internal pontoons are secured by wire mesh.

4. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 1, characterized in that, The external pontoon includes: a closed box structure formed by a pontoon upper plate, a pontoon lower plate and four pontoon side plates, multiple connecting plates and a predetermined number of pontoon partitions; Multiple connecting plates are evenly arranged on the side plate of the float facing the test damage model. One end of the connecting plate is welded to the side plate of the float facing the test damage model, and the other end of the connecting plate is welded to the outer plate of the test damage model. A predetermined number of the floating box partitions are installed inside the enclosed box structure, and the predetermined number of the floating box partitions divide the interior of the enclosed box structure into multiple compartments.

5. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 4, characterized in that, The number of the float box partitions is three. The three float box partitions include one transverse partition and two longitudinal partitions. The two longitudinal partitions are both perpendicular to the transverse partition and are perpendicular to each other. The three float box partitions divide the interior of the enclosed box structure into eight compartments.

6. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 5, characterized in that, The upper plate of the pontoon has through holes at its four corners that communicate with the four upper compartments. The lower plate of the pontoon has through holes at its four corners that communicate with the four lower compartments. The four corners of the transverse partition are respectively provided with through holes connecting the upper compartment and the lower compartment; The through-hole is used to adjust the amount of water injected into the cabin.

7. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 4, characterized in that, The upper plate, lower plate, side plate, connecting plate, and partition plate of the pontoon are all provided with reinforcing ribs.

8. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 1, characterized in that, The number of external pontoons is less than or equal to 4.

9. The method for adjusting the floating state of a damaged model in an underwater explosion test according to claim 1, characterized in that, The stability parameters include the transverse and longitudinal mesiocentric radii, transverse and longitudinal mesiocentric heights of the overall test device. The calculation of the stability parameters of the overall test device based on its overall buoyancy, center of buoyancy position, center of mass position, and the transverse and longitudinal moments of inertia of the external pontoons specifically includes: Based on the overall buoyancy W of the overall test setup and the lateral moment of inertia I of the external pontoon... T The radius BM of the transverse epicenter of the overall test setup is calculated as follows: Based on the overall buoyancy W of the overall test setup and the longitudinal moment of inertia I of the external pontoon... L Calculate the longitudinal geocentric radius BM of the overall test setup. L for: Based on the positions of the center of buoyancy, center of mass, and transverse metacenter radius BM of the overall test setup, the transverse metacenter height GM of the overall test setup is calculated as: GM = BM + CZ; where C is the longitudinal position of the center of buoyancy and Z is the longitudinal position of the center of mass. Based on the position of the center of buoyancy, the position of the center of mass, and the longitudinal radius of the stabilizer of the overall test apparatus. L Calculate the longitudinal height GM of the overall test setup. L For: GM L =BM L +CZ.

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