Distributed underwater explosion impact test device

Abstract

The invention relates to a distributed underwater explosion impact test device. The device comprises a water tank, a distributed mounting rack, a detonation assembly, a sample fixing assembly and a counterweight assembly, the distributed mounting frame is arranged in the water pool and is provided with a plurality of connecting ends which are circumferentially arranged along the central axis of the distributed mounting frame, and each connecting end can move in the direction close to or away from the central axis of the distributed mounting frame; the detonating assembly is arranged in the middle of the multiple connecting ends, and the detonating assembly is connected with the bottom of the distributed mounting frame; the sample fixing assembly is provided with a plurality of sample fixing ends for fixing samples, and the plurality of sample fixing ends are connected with the plurality of connecting ends of the distributed mounting rack; the counterweight assembly is detachably arranged on the distributed mounting frame; compared with a traditional single-station and multi-time detonation test mode, the explosion pool starting frequency and explosive consumption are remarkably reduced, the test efficiency is improved, and the comprehensive test cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater explosion impact and structure dynamics test, and particularly relates to a distributed underwater explosion impact test device. BACKGROUND

[0002] At present, underwater explosion impact tests on full-scale or near full-scale ship structures are mostly carried out in special explosion pools. Conventional arrangement forms usually set a single or a small number of sample stations in the pool, and each explosion only tests a single structure form or a single parameter combination. Due to the limitations of pool size, explosion safety distance, support structure arrangement, sample installation space and other conditions, it is difficult to simultaneously test multiple structure forms and multiple parameter combinations in one explosion. In order to obtain systematic comparative data, multiple explosions and arrangement adjustments are necessary, which not only prolongs the test period and increases the cost, but also aggravates the fatigue and damage of the structure due to repeated use of the explosion pool and its auxiliary facilities, further increasing the test maintenance cost and safety risk. At the same time, the spatial position between the sample and the explosion point in the traditional test arrangement is difficult to keep highly consistent, and the explosion position, charge attitude, water working condition and other factors in different batches of tests inevitably differ, which causes fluctuations in the shock wave amplitude, spectral characteristics and propagation path of each test, weakening the lateral comparability of different structures or parameters; although some equivalent loading methods are controllable in the laboratory, the shock wave form generated by them is significantly different from the three-dimensional spherical wave formed by actual underwater explosion, and it is difficult to provide reliable real explosion basis for ship structure underwater explosion impact resistance performance evaluation and impact resistance design.

[0003] Therefore, there is an urgent need for a test device and method that can simultaneously test multiple samples under the condition of real underwater explosion spherical wave load, efficiently obtain laterally comparable test data under the premise of ensuring the consistency of the loading environment of each sample, reduce the number of explosion pool uses and the overall test cost, and provide a reliable experimental basis for ship structure underwater explosion impact effect mechanism research and related structure impact resistance performance evaluation. SUMMARY

[0004] Therefore, there is an urgent need for a test device and method that can simultaneously test multiple samples under the condition of real underwater explosion spherical wave load, efficiently obtain laterally comparable test data under the premise of ensuring the consistency of the loading environment of each sample, reduce the number of explosion pool uses and the overall test cost, and provide a reliable experimental basis for ship structure underwater explosion impact effect mechanism research and related structure impact resistance performance evaluation.

[0005] This invention provides a distributed underwater explosion impact testing device, including a water tank, a distributed mounting frame, a detonation assembly, a sample fixing assembly, and a counterweight assembly. The distributed mounting frame is disposed in the water tank and has multiple connecting ends arranged circumferentially along its central axis. Each connecting end is movable in a direction close to or away from the central axis of the distributed mounting frame. The detonation assembly is disposed at the middle position of the multiple connecting ends and is connected to the bottom of the distributed mounting frame. The sample fixing assembly has multiple sample fixing ends for fixing the sample, and the multiple sample fixing ends are connected to the multiple connecting ends of the distributed mounting frame. The counterweight assembly is detachably disposed on the distributed mounting frame and is used to adjust the draft of the distributed mounting frame.

[0006] Furthermore, the distributed mounting frame includes a central column, an annular beam, multiple crossbeams, multiple longitudinal beams, and multiple adjusting rods. The annular beam is sleeved on the bottom of the central column. The multiple crossbeams are evenly arranged around the central column. The opposite ends of the multiple crossbeams are fixedly connected to the bottom end of the central column, and the opposite ends of the multiple crossbeams are fixedly connected to the annular beam. The multiple longitudinal beams are evenly arranged around the central column, and all of the multiple longitudinal beams are fixedly connected to the central column. The top ends of the multiple adjusting rods are slidably hinged to the multiple longitudinal beams, and the bottom ends of the multiple adjusting rods are slidably hinged to the multiple crossbeams. The bottom of each of the multiple adjusting rods forms a connecting end for connecting the fixed end of the sample.

[0007] Furthermore, it also includes multiple sliders and multiple limiting bolts. Each adjusting rod has a slider hinged to both ends. Each crossbeam and longitudinal beam is provided with a slider. Each slider is equipped with at least one limiting bolt, which passes through the slider and can abut against the crossbeam or the longitudinal beam.

[0008] Furthermore, it also includes multiple lifting lugs, and the bottom of the slider connected to the crossbeam is equipped with lifting lugs, which are fixedly connected to the top of the sample fixing end.

[0009] Furthermore, the detonation assembly includes an explosive charge, an explosive placement rod, a detonation cable, and a detonation platform. The bottom of the distributed mounting frame is connected to the explosive charge via the vertically arranged explosive placement rod, and the explosive charge is connected to the detonation platform via the detonation cable.

[0010] Furthermore, the sample fixing assembly includes multiple floats, multiple frame clamps, multiple connecting screws, and multiple silicone sealing gaskets. The tops of the multiple floats are respectively connected to the multiple connecting ends of the distributed mounting frame. The interior of the multiple floats is hollow, and their side walls have mounting ports facing the detonation assembly. The frame clamps are provided at the edges of the mounting ports of the floats for fixing the sample between the frame clamps and the floats. The silicone sealing gaskets are provided in the gap between the sample and the mounting ports.

[0011] Furthermore, the sample fixing assembly also includes an airtightness testing element, the air inlet and outlet ends of which are connected to the interior of the float box.

[0012] Furthermore, it also includes a data acquisition component, which is fixedly mounted on the distributed mounting frame and positioned directly opposite the detonation component.

[0013] Furthermore, the data acquisition component includes a free-field pressure sensor, a sensor deployment rod, and a signal line. The bottom of the distributed mounting frame is connected to the free-field pressure sensor via the vertically arranged sensor deployment rod, and the free-field pressure sensor is electrically connected to the signal line.

[0014] Furthermore, it also includes a control component, which includes a main control computer, a signal acquisition device, a synchronizer, an oscilloscope, and a signal debugging device, wherein the main control computer, the signal acquisition device, the synchronizer, the oscilloscope, the signal debugging device, the signal line, and the free field pressure sensor are electrically connected in sequence.

[0015] Compared with existing technologies, the distributed mounting frame has multiple connection ends that connect to multiple sample fixing ends of the sample fixing assembly, allowing multiple samples to be arranged simultaneously at different positions around the detonation assembly. The distance between each sample and the detonation assembly can be adjusted. In addition, the water immersion depth of the sample and the detonation assembly can be adjusted by the set counterweight assembly. Multiple sets of data can be obtained in a single detonation. Compared with the traditional single-station, multiple-detonation test method, this significantly reduces the number of times the explosion water pool is used and the consumption of explosives, improves test efficiency and reduces the overall test cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the distributed underwater explosion impact testing device provided in an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the distributed mounting rack; Figure 3 for Figure 2 Enlarged diagram of section A in the middle; Figure 4 for Figure 2 Enlarged diagram of section B; Figure 5 for Figure 1 Schematic diagram of the sample fixing assembly; Figure 6 for Figure 1 Installation diagram of the data acquisition component; Figure 7 for Figure 1 Installation diagram of the central control component. Detailed Implementation

[0018] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0019] like Figure 1 As shown in the figure, an embodiment of the present invention provides a distributed underwater explosion impact testing device, including a water tank 100, a distributed mounting frame 200, a detonation assembly 300, a sample fixing assembly 400, and a counterweight assembly 500. The distributed mounting frame 200 is disposed in the water tank 100 and has multiple connecting ends arranged circumferentially along its central axis. Each connecting end is movable along the direction close to or away from the central axis of the distributed mounting frame 200. The detonation assembly 300 is disposed at the middle position of the multiple connecting ends and is connected to the bottom of the distributed mounting frame 200. The sample fixing assembly 400 has multiple sample fixing ends for fixing the sample, and the multiple sample fixing ends are connected to the multiple connecting ends of the distributed mounting frame 200. The counterweight assembly 500 is detachably disposed on the distributed mounting frame 200 and is used to adjust the draft of the distributed mounting frame 200.

[0020] During implementation, multiple connection ends of the distributed mounting frame 200 are connected to multiple sample fixing ends of the sample fixing assembly 400, so that multiple samples can be arranged at different positions around the detonation assembly 300 at the same time, and the distance from each sample to the detonation assembly 300 can be adjusted. At the same time, the water immersion depth of the sample and the detonation assembly 300 can be adjusted by the set counterweight assembly 500. Multiple sets of data can be obtained in one detonation. Compared with the traditional single-station, multiple detonation test method, the number of times the explosion water pool 100 is used and the consumption of explosives are significantly reduced, the test efficiency is improved and the overall test cost is reduced.

[0021] The water tank 100 in this embodiment provides an underwater explosion test space for the underwater explosion impact test device. It is a structure that can be conceived by those skilled in the art, and will not be elaborated or explained in detail here.

[0022] The distributed mounting rack 200 in this embodiment provides a mounting base for the installation of multiple tests. Specifically, the distributed mounting rack 200 is disposed in the water tank 100 and has multiple connection ends arranged circumferentially along its central axis. Each connection end is movable in a direction close to or away from the central axis of the distributed mounting rack 200.

[0023] like Figure 2 As shown, in one embodiment, the distributed mounting frame 200 includes a central column 210, an annular beam 220, multiple crossbeams 230, multiple longitudinal beams 240, and multiple adjusting rods 250. The annular beam 220 is sleeved on the bottom of the central column 210. The multiple crossbeams 230 are evenly arranged around the central column 210. The opposite ends of the multiple crossbeams 230 are fixedly connected to the bottom end of the central column 210, and the opposite ends of the multiple crossbeams 230 are fixedly connected to the annular beam 230. The multiple longitudinal beams 240 are evenly arranged around the central column 210, and all of the multiple longitudinal beams 240 are fixedly connected to the central column 210. The top ends of the multiple adjusting rods 250 are slidably hinged to the multiple longitudinal beams 240, and the bottom ends of the multiple adjusting rods 250 are slidably hinged to the multiple crossbeams 230. The bottom of each of the multiple adjusting rods 250 forms a connecting end for connecting the fixed end of the sample.

[0024] The central column 210 serves as the supporting structure for the entire distributed mounting rack 200, and its interior can be equipped with channels for cable routing.

[0025] Among them, the ring beam 220 is used to fix one end of multiple crossbeams 230 facing away from each other.

[0026] The horizontal beam 230 is arranged horizontally, with one end fixedly connected to the inner ring of the annular beam 220 and the other end fixedly connected to the bottom side wall of the central column 210, providing load-bearing capacity for the sliding of the bottom end of the adjusting rod 250. It is understood that the horizontal beam 230, the annular beam 220, and the column can be connected by welding or other methods, with a method that ensures a stable connection and convenient installation being preferred.

[0027] The longitudinal beam 240 is vertically arranged to provide support for the sliding of the top of the adjusting rod 250.

[0028] The bottom end of the adjusting rod 250 is placed on the crossbeam 230, and the top end of the adjusting rod 250 is placed on the longitudinal beam 240. By sliding the adjusting rod 250, its bottom end can slide to any position on the crossbeam 230, thereby adjusting the distance between the sample fixing assembly 400 connected to its bottom and the detonation assembly 300.

[0029] To achieve a sliding hinge connection between the adjusting rod 250 and the crossbeam 230 and the longitudinal beam 240, and to allow the adjusting rod 250 to stop at any position, such as Figure 3 and Figure 4As shown, this embodiment also includes multiple sliders 260 and multiple limiting bolts 270. Each adjusting rod 250 has a slider 260 hinged at both ends. Each crossbeam 230 and longitudinal beam 240 is provided with a slider 260. Each slider 260 is equipped with at least one limiting bolt 270. The limiting bolt 270 passes through the slider 260 and can abut against the crossbeam 230 or the longitudinal beam 240.

[0030] During operation, first loosen the limit screw on the slider 260. At this time, the slider 260 can slide relative to the crossbeam 230 and the longitudinal beam 240. When the slider 260 on the crossbeam 230 slides to the preset position, tighten the limit screw on the slider 260. The slider 260 is then locked, thereby keeping the adjusting rod 250 in the current position.

[0031] It also includes a connecting shaft, which is fixed on the slider 260 and passes through the adjusting rod 250 and is rotatably connected to the adjusting rod 250.

[0032] To facilitate the connection between the slider 260 and the sample fixing assembly 400, multiple lifting lugs 280 are also included. Each slider 260 connected to the crossbeam 230 has a lifting lug 280 installed at its bottom, and the lifting lug 280 is fixedly connected to the top of the sample fixing end. Specifically, each slider 260 has two lifting lugs 280 installed at its bottom, and these two lifting lugs 280 are connected to a hanging plate 411 fixed to the top of the sample fixing assembly 400, effectively securing the sample fixing assembly 400.

[0033] The detonation assembly 300 in this embodiment provides underwater explosive impact loading. Specifically, the detonation assembly 300 is located at the middle of multiple connection ends and is connected to the bottom of the distributed mounting bracket 200.

[0034] like Figure 6 As shown, in one embodiment, the detonation assembly 300 includes an explosive charge 310, an explosive placement rod 320, a detonation cable 330, and a detonation platform 340. The bottom of the distributed mounting frame 200 is connected to the explosive charge 310 via the vertically arranged explosive placement rod 320, and the explosive charge 310 is connected to the detonation platform 340 via the detonation cable 330.

[0035] The explosive charge 310 is placed in the water tank 100, directly below the central pillar 210. The distance between the explosive charge 310 and the bottom of the central pillar 210 can be controlled by adjusting the length of the explosive placement rod 320. The explosive charge 310 can be ignited by the detonation platform 340 and the detonation cable 330. The explosive charge 310 can be a TNT charge.

[0036] In one embodiment, the underwater explosive impact load is generated by the detonation of explosive charge 310. The experimental design uses a TNT equivalent of 7 kg, a detonation distance of 2620 mm, an impact factor SF = 1.01, and a distance of 2000 mm from the center of explosive charge 310 to the water surface. According to the formula:

[0037] The maximum pulsation radius of the bubble was found to be D=2830mm, which is greater than the distance between the explosive and the water surface (2000mm). This indicates that the bubble will rise to the surface and burst before approaching the sample. Therefore, the above design condition can effectively reduce the impact of bubble pulsation on the sample.

[0038] In this embodiment, the sample fixing assembly 400 is connected to multiple sliders 260 on multiple crossbeams 230 to fix multiple samples to the bottom of the multiple sliders 260. Specifically, the sample fixing assembly 400 has multiple sample fixing ends for fixing the samples, and the multiple sample fixing ends are connected to multiple connecting ends of the distributed mounting frame 200.

[0039] like Figure 5 As shown, in one embodiment, the sample fixing assembly 400 includes multiple floats 410, multiple frame clamps 420, multiple connecting screws 430, and multiple silicone sealing gaskets 440. The tops of the multiple floats 410 are respectively connected to multiple connecting ends of the distributed mounting frame 200. The interior of the multiple floats 410 is hollow and its sidewalls are provided with mounting ports facing the detonation assembly 300. Frame clamps 420 are provided at the edges of the mounting ports of the floats 410 for fixing the sample between the frame clamps 420 and the floats 410. The silicone sealing gaskets 440 are provided in the gap between the sample and the mounting port.

[0040] The pontoon 410 can be made of steel plate and has an internal cavity to ensure that it has enough buoyancy to make the distributed mounting frame 200 float on the water surface.

[0041] In one embodiment, the pontoon 410 is designed as a rectangular box structure with dimensions of 1032 mm in length, 898 mm in width, and 2636 mm in height. The pontoon 410 is constructed of 12 mm thick steel plates, using Q355 steel with high yield strength and a density of 7850 kg / m³. The total mass of the pontoon 410 is 2193.4 kg. The pontoon 410 is welded from a panel and reinforcing ribs. The overall rigidity of the box structure is enhanced by welding reinforcing ribs around the pontoon 410 to prevent damage under the impact of an explosive shock wave. To prevent water jets generated by an underwater explosion from entering the pontoon 410 from above during underwater explosion experiments, a cap is installed on the top of the pontoon 410.

[0042] The frame-shaped clamp 420 is fixed to the mounting port on the side wall of the float box 410 by multiple connecting screws. A clamping gap is formed between the frame-shaped clamp 420 and the lip of the mounting port of the float box 410. The edge of the sample is embedded in the clamping gap, and the underwater sealing requirements of the float box 410 can be guaranteed by the silicone sealing gasket 440.

[0043] After the sample is installed, to test the airtightness of the float 410, in one embodiment, the sample fixing assembly 400 further includes an airtightness testing component, the air inlet and outlet of which are connected to the interior of the float 410. The airtightness testing component can be an air pump. After the float 410 is placed in the water tank 100, the air pump is connected to the hole at the top of the float 410 and air is pumped into the float 410. It is observed whether bubbles emerge around the sample. If bubbles are present, it indicates that the airtightness of the float 410 does not meet the requirements. Water-tight adhesive is used to further seal the poorly airtight areas of the float 410 (i.e., the bubbling areas). Then, the gas inside the float 410 is extracted through the hole at the top, and the pressure gauge reading is observed. When the pressure gauge shows that the pressure inside the float 410 reaches the pressure required for the experimental conditions, the extraction is stopped, and the pressure count is observed to ensure it remains stable within the required pressure range. If the pressure count remains constant, the overall airtightness of the float 410 is considered to meet the experimental requirements.

[0044] The entire device can float on the water surface of the pool 100 under the buoyancy of multiple float boxes 410. In order to control the draft of the detonation component 300 and the sample, this embodiment is achieved by a counterweight component 500. Specifically, the counterweight component 500 is detachably mounted on the distributed mounting frame 200 to adjust the draft of the distributed mounting frame 200.

[0045] In one embodiment, the counterweight assembly 500 includes multiple counterweight blocks, and the draft of the entire device can be adjusted by controlling the number of counterweight blocks placed on the central column 210. It is understood that the counterweight blocks can be implemented using structures such as pontoons, steel plates, and counterweight sandbags.

[0046] To facilitate the collection of underwater explosion free-field shock wave pressure, such as Figure 6 As shown, this embodiment includes a data acquisition component 600, which is fixedly mounted on the distributed mounting frame 200 and positioned directly opposite the detonation component 300.

[0047] In one embodiment, the data acquisition component 600 includes a free-field pressure sensor 610, a sensor deployment rod 620, and a signal line 630. The bottom of the distributed mounting bracket 200 is connected to the free-field pressure sensor 610 via the vertically arranged sensor deployment rod 620, and the free-field pressure sensor 610 is electrically connected to the signal line 630.

[0048] The free field pressure sensor 610 is provided with a bayonet structure that matches its shape and is connected to the distributed mounting bracket 200 through a positioning pin to limit the axial orientation of the free field pressure sensor 610.

[0049] like Figure 7 As shown, to facilitate the control of the detonation assembly 300 and the reception of data collected by the free field pressure sensor 610, this embodiment also includes a control assembly 700. The control assembly 700 includes a main control computer 710, a signal acquisition device 720, a synchronizer 730, an oscilloscope 740, and a signal debugger 750. The main control computer 710, the signal acquisition device 720, the synchronizer 730, the oscilloscope 740, the signal debugger 750, the signal line 630, and the free field pressure sensor 610 are electrically connected in sequence.

[0050] The synchro 730 is also connected to the detonator 340 to detonate the explosive charge 310. Under the control of the main control computer 710, the detonator 340 can be remotely controlled to detonate the explosive charge 310. The synchronization signal of the synchro 730 is used to coordinate the triggering and recording of each measurement channel and the detonation.

[0051] Workflow: S1) Install a free field pressure sensor 610 at the corresponding measuring point in the water tank 100. Arrange the first and second measuring points along the Y direction of the sample reference center, with radii D1 and D2 respectively. Connect the data acquisition instrument and protect it. The sensor measuring end faces the direction of shock wave propagation. S2) Install the sample onto the float box 410, clamp and fix the sample with the frame clamp 420, and seal the installation port of the float box 410 with the sealing silicone gasket 440. Apply sealant to all possible water ingress points to form a circumferential watertight interface. S3) Fix multiple float boxes 410 to the bottom of multiple sliders 260 respectively, and set the height of the movable sliders 260 so that multiple samples are arranged symmetrically. S4) Use a crane to put the assembled model into the water tank 100. Based on the buoyancy, make preliminary adjustments using small floats and steel plates, and then place counterweight sandbags to adjust the draft so that the draft coincides with the pre-marked line and maintains positive buoyancy. S5) Set multi-channel sampling and triggering parameters on the synchronizer 730, check the working status of the sensor, oscilloscope 740, synchronizer 730, signal debugger 750 and detonator 340, organize test personnel to familiarize themselves with the formal process, and complete the safety check. S6) Deploy underwater impact sources under legally qualified and safe isolation conditions, and complete remote triggering, interlocking and isolation settings; S7) Conduct underwater explosion tests, simultaneously record the free field pressure-time curve and sample response signal, and complete preliminary on-site data processing and backup.

[0052] S8) Hoist the model ashore, check the sealing integrity and leakage of the pontoon 410, organize the test records and equipment status, and prepare for subsequent in-depth data analysis and comparative evaluation.

[0053] Compared with existing technologies: (1) A distributed symmetrical arrangement is adopted. The movable slider 260 and the floating box 410 ensure that the explosion distance and water depth of each sample are consistent. Multiple sets of data can be obtained in one explosion. Compared with the traditional single-station, multiple explosion test method, the number of times the explosion pool 100 is used and the consumption of explosives are significantly reduced, the test efficiency is improved and the overall test cost is reduced.

[0054] (2) An actual underwater explosion was generated in the water tank 100 using explosive charge 310. The sample was located in the free field region of the explosion source and actually endured the spherical shock wave naturally formed by the explosive and the subsequent bubble pulsation pressure. This avoided the deviation caused by one-dimensional impact loading and made the obtained pressure-time history and structural response more reflective of the actual underwater explosion conditions in the project.

[0055] (3) The test device is modularly composed of a distributed mounting frame 200, an initiation assembly 300, a sample fixing assembly 400 and a data acquisition assembly 600. It has a compact structure, simple layout and adjustment steps, and is convenient for conducting live explosion verification in an underwater explosion test site with safety and qualification conditions. By changing the sample and adjusting the layout parameters, it can be used for underwater impact performance evaluation and impact effect mechanism research of different materials and structures, and has strong applicability and engineering promotion.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A distributed underwater explosion impact testing device, characterized in that, include: pool; A distributed mounting rack is disposed in the pool, the distributed mounting rack having a plurality of connecting ends arranged circumferentially along its central axis, each of the connecting ends being movable in a direction close to or away from the central axis of the distributed mounting rack; A detonation assembly is disposed at the middle position of the plurality of connection ends, and the detonation assembly is connected to the bottom of the distributed mounting frame; A sample fixing assembly having multiple sample fixing ends for fixing a sample, the multiple sample fixing ends being connected to multiple connecting ends of the distributed mounting frame. A counterweight assembly, detachably mounted on the distributed mounting frame, is used to adjust the draft of the distributed mounting frame.

2. The distributed underwater explosion impact testing device according to claim 1, characterized in that, The distributed mounting frame includes a central column, an annular beam, multiple crossbeams, multiple longitudinal beams, and multiple adjusting rods. The annular beam is fitted onto the bottom of the central column. The multiple crossbeams are evenly arranged around the circumference of the central column. The opposite ends of the multiple crossbeams are fixedly connected to the bottom of the central column, and the opposite ends of the multiple crossbeams are fixedly connected to the annular beam. The multiple longitudinal beams are evenly arranged around the circumference of the central column, and all of the multiple longitudinal beams are fixedly connected to the central column. The top ends of the multiple adjusting rods are slidably hinged to the multiple longitudinal beams, and the bottom ends of the multiple adjusting rods are slidably hinged to the multiple crossbeams. The bottom of each of the multiple adjusting rods forms a connecting end for connecting the fixed end of the sample.

3. The distributed underwater explosion impact testing device according to claim 2, characterized in that, It also includes multiple sliders and multiple limiting bolts. Each adjustment rod has a slider hinged to both ends. Each crossbeam and longitudinal beam is provided with a slider. Each slider is equipped with at least one limiting bolt, which passes through the slider and can abut against the crossbeam or the longitudinal beam.

4. The distributed underwater explosion impact testing device according to claim 3, characterized in that, It also includes multiple lifting lugs, and the bottom of the slider connected to the crossbeam is equipped with lifting lugs, which are fixedly connected to the top of the sample fixing end.

5. The distributed underwater explosion impact testing device according to claim 1, characterized in that, The detonation assembly includes an explosive charge, an explosive placement rod, a detonation cable, and a detonation platform. The bottom of the distributed mounting frame is connected to the explosive charge via the vertically arranged explosive placement rod, and the explosive charge is connected to the detonation platform via the detonation cable.

6. The distributed underwater explosion impact testing device according to claim 1, characterized in that, The sample fixing assembly includes multiple floats, multiple frame clamps, multiple connecting screws, and multiple silicone sealing gaskets. The tops of the multiple floats are respectively connected to the multiple connecting ends of the distributed mounting frame. The interior of the multiple floats is hollow and the side walls of the floats have mounting ports facing the detonation assembly. The frame clamps are provided at the edges of the mounting ports of the floats for fixing the sample between the frame clamps and the floats. The silicone sealing gaskets are provided in the gap between the sample and the mounting ports.

7. The distributed underwater explosion impact testing device according to claim 6, characterized in that, The sample fixing assembly also includes an air tightness testing device, the air inlet and outlet of which are connected to the interior of the float box.

8. The distributed underwater explosion impact testing device according to claim 1, characterized in that, It also includes a data acquisition component, which is fixedly mounted on the distributed mounting frame and positioned directly opposite the detonation component.

9. The distributed underwater explosion impact testing device according to claim 8, characterized in that, The data acquisition component includes a free-field pressure sensor, a sensor deployment rod, and a signal line. The bottom of the distributed mounting frame is connected to the free-field pressure sensor via the vertically arranged sensor deployment rod, and the free-field pressure sensor is electrically connected to the signal line.

10. The distributed underwater explosion impact testing device according to claim 9, characterized in that, It also includes a control component, which includes a main control computer, a signal acquisition device, a synchronizer, an oscilloscope, and a signal debugging device. The main control computer, the signal acquisition device, the synchronizer, the oscilloscope, the signal debugging device, the signal line, and the free field pressure sensor are electrically connected in sequence.

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