A method for evaluating damage power of deep water explosion

Abstract

The present application relates to a kind of deep water explosion damage power evaluation method, belong to deep water test and testing technical field, the whole process is completed by designing target model, builds measurement system, deep water explosion test and damage power characterization four major steps, can realize the quantitative evaluation of charge deep water explosion damage power, provides technical basis for charge deep water explosion damage power evaluation.

Description

Technical Field

[0001] This invention relates to the field of deep-water test evaluation methods, and in particular to a method for evaluating the destructive power of deep-water explosions. Background Technology

[0002] Deep-water explosive destructive power refers to the destructive capability of a charged explosive charge against deep-water targets under deep-water conditions. Currently, assessments of deep-water explosive destructive power are typically conducted within a pressure vessel to simulate a deep-water environment. Pressure sensors are used to measure the pressure-time history of the explosive charge, and the processed data, including shock wave energy, bubble energy, and total energy, are compared with a TNT benchmark charge to evaluate the explosive destructive power. However, this assessment method only characterizes the output energy of the deep-water explosive charge and does not reflect the effective energy utilization rate or the destructive power against underwater targets. Furthermore, due to the strength requirements of the pressure vessel itself and the presence of reflected waves from the vessel walls, experimental conditions such as the amount of explosive charge and the simulated water depth are strictly limited.

[0003] The ideal way to assess the destructive power of deep-sea explosions is to conduct deep-sea explosion dynamic response measurement tests on target models of deep-sea targets in actual deep-sea environments, using a target model of a new type of explosive charge and a reference charge. The destructive power is then assessed by the ratio of the dynamic response measurement results.

[0004] Actual deep-sea environment explosion tests have high requirements for sea conditions and other factors, making the tests difficult and costly to conduct. No explosion tests have been carried out in actual deep-sea environments in the current technology, and no method for assessing the destructive power of deep-sea explosions has been established, so it is impossible to provide a technical basis for assessing the destructive power of explosive deep-sea explosions. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a method for assessing the destructive power of deep-sea explosions, thereby providing a technical basis for assessing the destructive power of deep-sea explosions with explosive charges.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for assessing the destructive power of deep-water explosions includes the following operational steps:

[0008] Step 1: Design the target model;

[0009] The target model adopts the stiffened cylindrical shell structure commonly used for deep-water targets;

[0010] The specific structure of the target model is as follows: it includes a reinforced cylindrical shell, an elastic installation equipment simulation component, a rigid installation equipment simulation component, an instrument mounting platform, and a head. One of the heads has a watertight joint. The elastic installation equipment simulation component is connected to the reinforced cylindrical shell through a rubber shock absorber. The rigid installation equipment simulation component is directly welded to the reinforced cylindrical shell. The instrument mounting platform is connected to the reinforced cylindrical shell through a wire rope shock absorber.

[0011] Step 2: Set up the measurement system;

[0012] Several strain gauges were attached to the stiffened cylindrical shell, and an acceleration sensor was installed on the elastic mounting equipment simulation component; the measuring instrument was fixed on the instrument mounting platform.

[0013] Step 3: Deep-water explosion test;

[0014] A charge positioning bracket is installed on the outer surface of the target model, and the charge is fixed on the charge positioning bracket; an electric detonator is installed and a detonation cable is connected; the target model is lowered into the water from the aft deck of the test ship via a hydraulic winch, an A-type telescopic frame, and a steel wire rope. During the deployment process, a composite cable is released. After reaching the specified depth, the other end of the composite cable is connected to the measurement computer on the test ship; the measurement computer controls the start of the measurement instrument and confirms that the measurement system is normal.

[0015] Step 4: Demonstration of destructive power;

[0016] The strain and acceleration dynamic response data of the target model under the explosion of the reference charge and the new charge are processed and analyzed to obtain the peak strain and peak acceleration of all measuring points. The peak values ​​of all measuring points of the new charge are compared with those of the reference charge, and the average value of the ratio is used to characterize the destructive power.

[0017] Its further technical solution lies in:

[0018] In the first step, the end cap welded at one end is welded, while the end cap at the other end is connected to the end face of the stiffened cylindrical shell by flange, bolts and sealing ring.

[0019] In the second step, an internal camera, a water leakage alarm, and a depth gauge are installed inside the target model, an external camera and an external lighting source are installed outside the target model, and a special pressure sensor for deep-sea explosion is placed at the same blast distance outside the target model.

[0020] In the second step, strain gauges, accelerometers, internal cameras, water leak alarms, depth gauges, external cameras, external lighting sources, pressure sensors, and the input channels of measuring instruments are connected. The output channels of the measuring instruments are connected to one end of a composite cable with communication, power supply, and detonation functions. The composite cable passes through the watertight connector on the end cap.

[0021] In the third step, the target model is confirmed to have reached the predetermined depth by the depth gauge, the condition of the charge and target model is confirmed to be normal by the external camera image, and the working condition of the measuring instruments is confirmed to be normal by the internal camera image. After the normality is confirmed, the charge is detonated, and the data acquisition and storage of pressure, strain, acceleration and test process images are completed. The target model is retrieved to the aft deck of the test ship by a hydraulic winch, A-type telescopic frame and steel wire rope. During the retrieval process, the composite cable is taken up. First, a deep-water explosion test of the benchmark charge is carried out, and then a deep-water explosion test of the new charge is carried out.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention has a compact and reasonable structure and is easy to operate. Through target model design, measurement system construction, deep-water explosion test, and damage power characterization, it can realize the quantitative assessment of the damage power of deep-water explosion of explosive charges, providing a technical basis for the assessment of the damage power of deep-water explosion of explosive charges. Attached Figure Description

[0024] Figure 1 This is a flowchart of the deep-water explosion damage assessment method of the present invention.

[0025] Figure 2 This is a diagram showing the overall layout of the deep-water explosion damage assessment test of this invention.

[0026] Figure 3 This is a diagram showing the layout of the target model measurement system and the charge arrangement of the present invention.

[0027] Figure 4 for Figure 3 Side view.

[0028] Figure 5 This is a deep-water explosion pressure curve diagram of the present invention.

[0029] Figure 6 This is a typical positional strain curve of the deep-water explosion target model of the present invention.

[0030] Figure 7 This is an acceleration curve of the simulated component of the deep-water explosive elastic installation device of the present invention.

[0031] Figure 8 This is an acceleration curve of the simulation component of the deep-water explosion rigid installation equipment of the present invention.

[0032] The components include: 1. Target model; 2. Reinforced cylindrical shell; 3. Elastic installation equipment simulation component; 4. Rigid installation equipment simulation component; 5. Instrument mounting platform; 6. Watertight joint; 7. End cap; 8. Rubber shock absorber; 9. Steel wire rope shock absorber; 10. Strain gauge; 11. Accelerometer; 12. Internal camera; 13. Leakage alarm; 14. Depth gauge; 15. External camera; 16. External lighting source; 17. Pressure sensor; 18. Measuring instrument; 19. Composite cable; 20. Charge positioning bracket; 21. Charge; 22. Electric detonator; 23. Detonating cable; 24. Test vessel; 25. Hydraulic winch; 26. Type A telescopic frame; 27. Steel wire rope; 28. Measuring computer. Detailed Implementation

[0033] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0034] The specific operation procedure of the deep-water blast damage assessment method described in this embodiment is as follows:

[0035] Step 1: Design of target model 1.

[0036] Target model 1 is the "ruler" for deep-water blast damage assessment. To reflect the damage characteristics of deep-water targets, target model 1 adopts the stiffened cylindrical shell structure commonly used for deep-water targets. In order to obtain the dynamic response of the equipment, equipment simulation parts are arranged inside, using both elastic and rigid installation methods. An internal measurement method is adopted, with the measuring instrument 18 fixed on the instrument mounting platform 5. The end cap 7 welded at one end is welded, and the end cap 7 at the other end is connected to the end face of the stiffened cylindrical shell 2 through flanges, bolts, and sealing rings.

[0037] The specific structure of target model 1 is as follows: it mainly includes a reinforced cylindrical shell 2, an elastic installation equipment simulation component 3, a rigid installation equipment simulation component 4, an instrument mounting platform 5, and end caps 7 with watertight joints 6 at both ends; the elastic installation equipment simulation component 3 is connected to the reinforced cylindrical shell 2 through rubber shock absorbers 8, and the rigid installation equipment simulation component 4 is directly welded to the reinforced cylindrical shell 2; the instrument mounting platform 5 is connected to the reinforced cylindrical shell 2 through wire rope shock absorbers 9;

[0038] Step 2: Setting up the measurement system.

[0039] To measure the strain and acceleration dynamic response data of the target model under explosion, several strain gauges 10 (E1~E8, bidirectional gauges) are attached at typical positions of the stiffened cylindrical shell 2. Accelerometers 11 (A1 and A2) are installed at typical positions of the equipment simulation components. To monitor the target model and the state of the explosive charge, an internal camera 12, a water leakage alarm 13, and a depth gauge 14 are installed inside the target model. An external camera 15 and an external lighting source 16 are installed outside the target model. To monitor the detonation state of the explosive charge, a deep-water explosion-specific pressure sensor 17 is arranged at the constant detonation distance outside the target model 1. The measuring instrument 18 is fixed on the instrument mounting platform 5. The strain gauges 10, acceleration sensors 11, internal camera 12, water leakage alarm 13, depth gauge 14, external camera 15, external lighting source 16, and pressure sensor 17 are connected to the input channel of the measuring instrument 18. The output channel of the measuring instrument 18 is connected to one end of a composite cable 19 with communication, power supply, and detonation functions. The composite cable 19 passes through the watertight connector 6 on the end cap 7.

[0040] Step 3: Deep-water explosion test.

[0041] A charge positioning bracket 20 is installed on the outer surface of the target model 1, and the charge 21 is fixed on the charge positioning bracket 20; an electric detonator 22 is installed and a detonation cable 23 is connected; the target model 1 is lowered into the water from the aft deck of the test vessel 24 via a hydraulic winch 25, an A-type telescopic frame 26, and a steel wire rope 27. During the lowering process, a composite cable 19 is released. After reaching the designated depth, the other end of the composite cable 19 is connected to a measuring computer 28 on the test vessel 24; the measuring computer 28 controls the start of the measuring instrument 18 to confirm that the measuring system is normal; the depth gauge 14 confirms that the target model 1 has reached the predetermined depth; the images from the external camera 15 confirm that the charge 21 and the target model 1 are in normal condition; the images from the internal camera 12 confirm that the measuring instrument 18 is working normally; after confirming that everything is normal, the charge 21 is detonated, and the data acquisition and storage of pressure, strain, acceleration, and test process images are completed; the target model 1 is retrieved to the aft deck of the test vessel 24 via the hydraulic winch 25, the A-type telescopic frame 26, and the steel wire rope 27, and the composite cable 19 is retrieved during the retrieval process. First, conduct deep-water explosion tests with the standard charge, and then conduct deep-water explosion tests with the new charge.

[0042] Step 4: Destructive power assessment.

[0043] The strain and acceleration dynamic response data of target model 1 under the explosion of the reference charge and the new charge were processed and analyzed to obtain the peak strain and peak acceleration of all measuring points (Table 1 and Table 2). The peak values ​​of all measuring points of the new charge were compared with those of the reference charge, and the average value of the ratio (Table 3) was used to characterize the destructive power. It was found that the destructive power of the new charge in deep water explosion is 1.29 times that of the reference charge.

[0044] Table 1. Peak strain and acceleration of the target model under the action of a reference charge explosion.

[0045] E1x 856 E1y 4590 E2x 789 E2y 6952 E3x 855 E3y 803 E4x 3201 E4y 912 E5x 4526 E5y 715 E6x 4290 E6y 3151 E7x 591 E7y 784 E8x 1270 E8y 489 A1 17 A2 1081

[0046] Table 2. Peak strain and acceleration of the target model under the action of novel explosive charge.

[0047] E1x 1307 E1y 5902 E2x 958 E2y 8690 E3x 1153 E3y 1004 E4x 3996 E4y 1054 E5x 5658 E5y 694 E6x 3684 E6y 3260 E7x 751 E7y 1173 E8x 1775 E8y 815 A1 23 A2 1768

[0048] Table 3. Ratio of peak strain and acceleration of the target model under the explosion effects of the novel charge and the reference charge.

[0049] E1x 1.53 E1y 1.29 E2x 1.21 E2y 1.25 E3x 1.35 E3y 1.25 E4x 1.25 E4y 1.16 E5x 1.25 E5y 0.97 E6x 0.86 E6y 1.03 E7x 1.27 E7y 1.50 E8x 1.40 E8y 1.67 A1 1.38 A2 1.64 average value 1.29

[0050] The evaluation method includes four steps: target model design, measurement system construction, deep-water blast test, and damage force characterization.

[0051] The target model consists of a reinforced cylindrical shell, a simulated elastic installation device, a simulated rigid installation device, an instrument mounting platform, and end caps with watertight joints at both ends.

[0052] The measurement system includes strain gauges, accelerometers, internal cameras, water leak alarms, depth gauges, external cameras, external lighting sources, and pressure sensors. The measuring instruments are fixed on the instrument mounting platform, and the output channel is connected to one end of the composite cable, while the other end of the composite cable is connected to the measurement computer on the test vessel.

[0053] During the deep-water explosion test, a charge positioning bracket was installed on the outer surface of the target model, and the charge was fixed on the charge positioning bracket. The target model was deployed and retrieved from the aft deck of the test ship via a hydraulic winch, an A-type telescopic frame and a steel wire rope. During the process, the composite cable was released and retrieved.

[0054] The method for characterizing destructive power is to take the peak strain and peak acceleration of all measuring points as the test results, compare the test results of the reference charge and the new charge, and take the average value of the ratio of all measuring points to characterize the destructive power.

[0055] It can realize the quantitative assessment of the destructive power of deep-water explosive charges, providing a technical basis for the assessment of the destructive power of deep-water explosive charges.

[0056] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A method for assessing the destructive power of deep-water explosions, characterized in that: The following steps are included: Step 1: Design the target model (1); The target model (1) adopts the stiffened cylindrical shell structure commonly used for deep-water targets; The specific structure of the target model (1) is as follows: it includes a reinforced cylindrical shell (2), an elastic installation equipment simulation component (3), a rigid installation equipment simulation component (4), an instrument installation platform (5), and a head (7). One of the heads (7) has a watertight joint (6). The elastic installation equipment simulation component (3) is connected to the reinforced cylindrical shell (2) through a rubber shock absorber (8). The rigid installation equipment simulation component (4) is directly welded to the reinforced cylindrical shell (2). The instrument installation platform (5) is connected to the reinforced cylindrical shell (2) through a wire rope shock absorber (9). Step 2: Set up the measurement system; Several strain gauges (10) are attached to the stiffened cylindrical shell (2), and an acceleration sensor (11) is installed on the elastic installation equipment simulation part (3); the measuring instrument (18) is fixed on the instrument installation platform (5); Step 3: Deep-water explosion test; Install a charge positioning bracket (20) on the outer surface of the target model (1), and fix the charge (21) on the charge positioning bracket (20); install an electric detonator (22) and connect the detonation cable (23); the target model (1) is laid into the water from the aft deck of the test ship (24) through a hydraulic winch (25), an A-type telescopic frame (26) and a steel wire rope (27). During the laying process, the composite cable (19) is released. After reaching the specified depth, one end of the composite cable (19) is connected to the measuring computer (28) on the test ship (24), and the other end passes through the watertight joint (6) on the end cap (7) and is connected to the measuring instrument (18). The measuring computer (28) controls the start of the measuring instrument (18) to confirm that the measuring system is normal. Step 4: Demonstration of destructive power; The strain and acceleration dynamic response data of the target model (1) under the explosion of the reference charge and the new charge were processed and analyzed to obtain the strain peak value and acceleration peak value of all measuring points. The peak values ​​of all measuring points of the new charge were compared with those of the reference charge, and the average value of the ratio was taken to characterize the destructive power.

2. The method for assessing the destructive power of deep-water explosions as described in claim 1, characterized in that: In the first step, the end cap (7) welded at one end is welded, and the end cap (7) at the other end is connected to the end face of the stiffened cylindrical shell (2) by flange, bolt and sealing ring.

3. The method for assessing the destructive power of deep-water explosions as described in claim 2, characterized in that: In the second step, an internal camera (12), a water leakage alarm (13) and a depth gauge (14) are installed inside the target model (1), an external camera (15) and an external lighting source (16) are installed outside the target model (1), and a deep-water explosion-specific pressure sensor (17) is arranged at the blast distance outside the target model (1).

4. The method for assessing the destructive power of deep-water explosions as described in claim 3, characterized in that: In the second step, the strain gauge (10), accelerometer (11), internal camera (12), water leak alarm (13), depth gauge (14), external camera (15), external lighting source (16), pressure sensor (17) are connected to the input channel of measuring instrument (18), and the output channel of measuring instrument (18) is connected to one end of composite cable (19) which has communication, power supply and detonation functions. Composite cable (19) passes through watertight connector (6) on end cap (7).

5. The method for assessing the destructive power of deep-water explosions as described in claim 4, characterized in that: In the third step, the target model (1) is confirmed to have reached the predetermined depth by the depth gauge (14), the condition of the charge (21) and the target model (1) is confirmed to be normal by the image of the external camera (15), and the working condition of the measuring instrument (18) is confirmed to be normal by the image of the internal camera (12). After confirming that it is normal, the charge (21) is detonated, and the data acquisition and storage of pressure, strain, acceleration and test process images are completed. The target model (1) is retrieved to the aft deck of the test ship (24) by the hydraulic winch (25), the A-type telescopic frame (26) and the wire rope (27). During the retrieval process, the composite cable (19) is retrieved. The deep-water explosion test of the reference charge is carried out first, and then the deep-water explosion test of the new charge is carried out.

Images