Ice area environment double-layer shell three-dimensional acoustic elastic model test verification method

Abstract

The invention relates to an ice area environment double-layer shell three-dimensional acoustic elastic model test verification method. The method comprises the following steps: S1, constructing a double-layer shell ring rib cylindrical shell model assembly; s2, a sensor assembly is arranged on each double-layer shell ring rib cylindrical shell model; s3, performing a dry mode test on each double-layer shell ring rib cylindrical shell model, and obtaining test data in the dry mode test through a sensor assembly; and S4, each double-layer shell ring rib cylindrical shell model is put down into an ice layer water area, and a hydrophone assembly is arranged underwater, so that each double-layer shell ring rib cylindrical shell model is subjected to an underwater sound radiation test in an ice area environment, and test data in the underwater sound radiation test are obtained through the hydrophone assembly. The underwater acoustic radiation test in the ice area environment can be carried out on the double-layer shell three-dimensional acoustic elasticity model, and powerful experimental support and data support are provided for three-dimensional acoustic elasticity theoretical analysis of a double-basin coupling ship with an acoustic covering layer laid in the ice area environment.

Description

Technical Field

[0001] The present invention relates to the technical field of calculation and testing of the vibration, fluid-structure coupling, acoustic radiation and sound propagation of underwater double-fluid domain structures in ice regions, and in particular to a method for verifying a three-dimensional acoustic elasticity model test of a double-layer shell in an ice region environment. Background Art

[0002] With the continuous development of the marine economy, human exploration of the ocean has gradually moved towards the deep sea and polar regions, and the operation tasks of storage and transportation ships, scientific research ships and underwater ships in the polar regions have gradually increased. In the complex polar environment, the water surface is covered with floating ice and floating glaciers with a thickness of up to several meters, which brings unprecedented challenges to the navigation and acoustic characteristics of ships.

[0003] In the prior art, for the prediction and verification of the underwater vibration and acoustic radiation of ships, it mostly relies on single-layer shell or double-layer shell models. Although these models can simulate the vibration characteristics of ship structures under the coupling action of double-fluid domains to a certain extent, they cannot comprehensively consider the influence of the acoustic covering layer on the acoustic performance, and rarely involve the particularity of the ice region environment. Specifically, even if an acoustic layer is laid on the single-layer shell model, it cannot accurately reflect the comprehensive effect of the double-fluid domain environment on the acoustic and vibration characteristics of the ship; while the double-layer shell model is closer to the actual ship in structure, but it is still insufficient in the experimental verification under the ice region environment. In addition, the existing methods and technologies for verifying the three-dimensional acoustic elasticity model test of the double-layer shell in the ice region environment also fail to fully meet the comprehensive evaluation requirements for the acoustic and vibration characteristics of ships with acoustic covering layers in the ice region environment. To sum up, how to design a double-layer shell model test verification method that can take these factors into account, how to select a suitable test site in the real ice-covered water area, and how to scientifically arrange measurement points to comprehensively capture the acoustic and vibration characteristics of the underwater model in the ice layer environment have become technical problems to be solved urgently. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology and provides a method for verifying a three-dimensional acoustic elasticity model test of a double-layer shell in an ice region environment, which can carry out underwater acoustic radiation tests on the three-dimensional acoustic elasticity model of the double-layer shell in the ice region environment, so as to comprehensively capture the acoustic and vibration characteristics of the three-dimensional acoustic elasticity model of the double-layer shell in the ice layer environment, and provide strong experimental support and data support for the three-dimensional acoustic elasticity theory analysis of double-fluid domain coupled ships with acoustic covering layers in the ice region environment.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A method for verifying a three-dimensional acoustic elasticity model test of a double-layer shell in an ice region environment includes the following steps:

[0007] S1. Construct a double-layer shell ring-stiffened cylindrical shell model assembly, and the double-layer shell ring-stiffened cylindrical shell model assembly includes at least one double-layer shell ring-stiffened cylindrical shell model;

[0008] The structure of a single double-layer shell ring-stiffened cylindrical shell model is as follows: it includes a cylinder body, and end caps are respectively installed at the top and bottom of the cylinder body. The cylinder body includes an inner shell and an outer shell arranged coaxially, and the diameter of the outer shell is greater than that of the inner shell.

[0009] A base for carrying an exciter is fitted inside the inner shell. The excitation rod of the exciter abuts against the inner side wall surface of the inner shell, and several vibration isolators are arranged between the base and the exciter.

[0010] S2. Sensor assemblies are respectively arranged on each double-layer shell ring-stiffened cylindrical shell model. A single set of sensor assemblies includes a first acceleration sensor unit arranged on the inner side wall surface of the inner shell, a second acceleration sensor unit arranged on the base, and a force sensor arranged at the output end of the exciter.

[0011] The first acceleration sensor unit is used to obtain the natural frequency, modal vibration mode and vibration response of the corresponding inner shell.

[0012] The second acceleration sensor unit is used to obtain the vibration response of the corresponding base.

[0013] The force sensor is used to obtain the excitation force provided by the exciter.

[0014] S3. Each double-layer shell ring-stiffened cylindrical shell model is respectively suspended in the air, so as to respectively conduct dry modal tests on each double-layer shell ring-stiffened cylindrical shell model, and test data in the dry modal tests are obtained through the sensor assemblies.

[0015] S4. Each double-layer shell ring-stiffened cylindrical shell model is respectively lowered into the ice-covered water area, and a hydrophone assembly is arranged underwater, so as to respectively conduct underwater acoustic radiation tests on each double-layer shell ring-stiffened cylindrical shell model in the ice area environment, and test data in the underwater acoustic radiation tests are obtained through the hydrophone assembly.

[0016] As a further improvement of the above technical solution:

[0017] In S4, when conducting an underwater acoustic radiation test on one of the double-layer shell ring-stiffened cylindrical shell models, the following steps are included:

[0018] S4.1. Install an exciter and arrange a sensor assembly inside the double-layer shell ring-stiffened cylindrical shell model, tie the cables of the exciter and the sensor assembly, and pass them out through a gooseneck head installed on an end cap, so as to be connected to external devices.

[0019] S4.2. Debug and check the sensor assembly to confirm that the signals of the sensor assembly are correct.

[0020] S4.3. String one end of the rope through the counterweight iron, and fix the other end of the rope to the bottom of the double-shell ring-stiffened cylindrical shell model;

[0021] S4.4. Use an ice chiseling tool to chisel ice holes on the ice surface to select the water entry area;

[0022] S4.5. Pass the lifting rope assembly through the lifting lug assembly on the top cover of the double-shell ring-stiffened cylindrical shell model, and connect the lifting rope assembly to the lifting ring of the equipment therein;

[0023] Mark the corresponding position on the lifting rope assembly according to the diving depth requirement of the double-shell ring-stiffened cylindrical shell model;

[0024] S4.6. Lift the double-shell ring-stiffened cylindrical shell model by a lifting device, and lower the double-shell ring-stiffened cylindrical shell model into the water through the ice hole. When the mark on the lifting rope assembly approaches the water surface, stop lowering;

[0025] S4.7. Use an ice chiseling tool to chisel several ice holes on the ice surface, and deploy the hydrophone array underwater through each ice hole. One ice hole corresponds to one measurement point;

[0026] S4.8. Keep the double-shell ring-stiffened cylindrical shell model stationary, and obtain background noise data through the hydrophone array;

[0027] S4.9. Turn on the shaker, move the hydrophone array to traverse the ice holes, and record the vibration acceleration and underwater acoustic data obtained at each measurement point;

[0028] S4.10. Lift the double-shell ring-stiffened cylindrical shell model out of the water by a lifting device and place it on the floating ship deck, and unload the double-shell ring-stiffened cylindrical shell model from the lifting device to complete the test.

[0029] In S4.1, a hose is installed on the pagoda head through a clamp, and waterproof glue is applied between the hose and the pagoda head to achieve watertightness.

[0030] In S4.4, two auxiliary ropes are led out from the top cover of the double-shell ring-stiffened cylindrical shell model, and the attitude of the double-shell ring-stiffened cylindrical shell model is maintained stable after it enters the water through the two auxiliary ropes.

[0031] In S4.6, the diving depth of the double-shell ring-stiffened cylindrical shell model is 5 m from the ice surface.

[0032] In S4.7, the hydrophone array includes ten serially connected hydrophones, the distance between adjacent two hydrophones is 1 m, and a heavy object is fixed at the end of the hydrophone array for counterweight;

[0033] After the hydrophone array enters the water, the uppermost hydrophone in the hydrophone array is 1 m from the ice surface.

[0034] In S4.7, five measuring points are arranged, and the five measuring points are evenly distributed along a semi-circular arc with a radius of 20 m, so that the five measuring points cover a 180° area on one side of the ice cave.

[0035] In S1, the double-layer shell ring-ribbed cylindrical shell model assembly includes at least three double-layer shell ring-ribbed cylindrical shell models;

[0036] The outer shell of one of the double-layer shell ring-ribbed cylindrical shell models is made of steel, and an acoustic covering layer is laid on the outer side wall surface of the outer shell;

[0037] The outer shell of another double-layer shell ring-ribbed cylindrical shell model is made of steel;

[0038] The outer shell of yet another double-layer shell ring-ribbed cylindrical shell model is made of glass fiber reinforced plastic.

[0039] In S2, a single set of first acceleration sensor units includes twelve first acceleration sensors evenly spaced along the radial direction;

[0040] A single set of second acceleration sensor units includes four second acceleration sensors.

[0041] In S3, third acceleration sensor units are respectively arranged on the inner side wall surface of the outer shell of each double-layer shell ring-ribbed cylindrical shell model, and the third acceleration sensor units are used to test the natural frequency and modal vibration mode of the corresponding outer shell;

[0042] A single set of third acceleration sensor units includes six third acceleration sensors evenly spaced along the radial direction.

[0043] The beneficial effects of the present invention are as follows:

[0044] By setting the double-layer shell ring-ribbed cylindrical shell model assembly, setting the step of performing dry modal testing on the model in the air, and setting the step of performing underwater acoustic radiation testing on the model in the ice area environment, the present invention has direct guiding significance for the experimental verification of ship acoustic characteristics, can serve the development of ship three-dimensional acoustic elasticity theory and application technology, provides a model test scheme for the assessment and verification of corresponding calculation methods and calculation software, and plays a good supporting role in its further development and popularization and application.

[0045] By setting the step of respectively arranging sensor assemblies on each double-layer shell ring-ribbed cylindrical shell model, the steps of ice cave excavation and ice hole excavation, the present invention can reasonably arrange each measuring point, thereby avoiding the influence of external interference factors on the test results and effectively improving the accuracy of the test results.

[0046] The present invention can obtain vibration response data of the model in different environments by conducting modal tests on the double-shell ring-ribbed cylindrical shell model assembly in atmospheric environment and acoustic radiation tests in ice waters respectively; and can obtain acoustic radiation data of the model under ice water by setting a hydrophone array, thereby providing strong data support for the optimization of acoustic stealth design of ships in polar environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the double-shell ring-ribbed cylindrical shell model in the present invention.

[0048] Figure 2 for Figure 1 A side sectional view of .

[0049] Figure 3 It is a schematic diagram of the structure of the inner shell in the present invention.

[0050] Figure 4 Schematic diagram of three types of shells in the present invention.

[0051] Figure 5 It is a schematic diagram of the arrangement of the sensor components in the present invention.

[0052] Figure 6 Schematic diagram of the measurement point arrangement and test status of underwater hydrophone.

[0053] Figure 7 This is a schematic diagram of the arrangement of measuring points on the ice surface.

[0054] Figure 8 This is a schematic diagram of one of the measuring points on the ice surface during the actual test process.

[0055] Among them: 1. inner shell; 101. flange; 102. sealing groove; 2. outer shell; 201. covering layer; 3. cover; 301. pagoda head; 302. lifting ear assembly; 303. hook; 4. rib; 5. elbow plate; 6. panel; 7. vibration isolator; 8. vibration exciter. DETAILED DESCRIPTION

[0056] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0057] like Figures 1-8 As shown, the ice zone environment double-shell three-dimensional acoustic elastic model test verification method of this embodiment includes the following steps:

[0058] S1. construct a double-shell ring-ribbed cylindrical shell model component, wherein the double-shell ring-ribbed cylindrical shell model component includes at least one double-shell ring-ribbed cylindrical shell model;

[0059] like Figures 1-2As shown in the figure, the structure of a single double-layer shell ring-stiffened cylindrical shell model is as follows: It includes a cylinder body, and covers 3 are respectively installed at the top and bottom of the cylinder body. The cylinder body includes an inner shell 1 and an outer shell 2 arranged coaxially, and the diameter of the outer shell 2 is larger than that of the inner shell 1;

[0060] Inside the inner shell 1, a base for carrying the shaker 8 is fitted. The excitation rod of the shaker 8 abuts against the inner side wall surface of the inner shell 1, and several vibration isolators 7 are arranged between the base and the shaker 8;

[0061] As Figure 3 shown, flanges 101 are provided at both ends of the inner shell 1. Sealing grooves 102 for installing sealing rings are formed on a single flange 101. The inner shell 1 is hermetically installed with the two covers 3 respectively through a sealing ring assembly, so as to prevent water from entering the inside of the inner shell 1 during underwater testing;

[0062] The outer shell 2 and the two covers 3 are fixed by bolts without sealing measures. Therefore, during underwater testing, the space between the outer shell 2 and the inner shell 1 is permeable to water, forming an internal flow field area of the model; the outside of the outer shell 2 is a water medium, forming an external flow field area of the model, so as to simulate the double flow field of a ship;

[0063] Several ribs 4 are evenly spaced along the axial direction on the inner side wall surface of the inner shell 1. A single rib 4 is arranged in a ring shape to strengthen the structural strength of the inner shell 1;

[0064] The base includes two spaced T-shaped plates. A single T-shaped plate includes a bracket 5 and a panel 6 with end faces arranged perpendicular to each other. The bracket 5 is used to support the panel 6, and the panel 6 is used to support the shaker 8; in order to improve the support performance of the base, several reinforcing plates are fitted between a single bracket 5 and the corresponding panel 6;

[0065] Four vibration isolators 7 are arranged. Two of them are installed on one panel 6, and the other two are installed on the other panel 6, so as to stably support the shaker 8; in this embodiment, vibration isolators 7 with lower stiffness and lower installation frequency are selected, which can effectively block the dynamic force transmitted from the shaker 8 to the base through the vibration isolators 7, and ensure that the excitation force is only transmitted to the cylinder body through the excitation rod.

[0066] Specifically, the double-layer shell ring-stiffened cylindrical shell model assembly includes at least three double-layer shell ring-stiffened cylindrical shell models;

[0067] As Figure 4As shown in (a), the outer shell 2 of a double-layer shell ring-stiffened cylindrical shell model is made of steel, and an acoustic covering layer 201 is laid on the outer side wall surface of the outer shell 2. The outer shell 2 of the double-layer shell ring-stiffened cylindrical shell model is formed by splicing and enclosing six steel arc-shaped plates with a contour radian of 60°. The acoustic covering layer 201 is laid on the outer side wall surface of each arc-shaped plate through an adhesive. For the single-layer acoustic covering layer 201, one side is provided with a convex strip and the other side is provided with a groove, so as to facilitate the embedded connection between the corresponding acoustic covering layers 201 when two arc-shaped plates are spliced.

[0068] As Figure 4 As shown in (b), the outer shell 2 of another double-layer shell ring-stiffened cylindrical shell model is made of steel, and the double-layer shell ring-stiffened cylindrical shell model is formed by splicing and enclosing six steel arc-shaped plates with a contour radian of 60°.

[0069] As Figure 4 As shown in (c), the outer shell 2 of yet another double-layer shell ring-stiffened cylindrical shell model is made of fiberglass, and the double-layer shell ring-stiffened cylindrical shell model is formed by splicing and enclosing six fiberglass arc-shaped plates with a contour radian of 60°.

[0070] Both steel and fiberglass are common materials in the actual production and manufacturing process of ships. In addition, the steel outer shell 2 with the acoustic covering layer 201 laid can test and verify the acoustic stealth characteristics of the acoustic covering layer 201.

[0071] S2. Sensor assemblies are respectively arranged on each double-layer shell ring-stiffened cylindrical shell model. A single set of sensor assemblies includes a first acceleration sensor unit arranged on the inner side wall surface of the inner shell 1, a second acceleration sensor unit arranged on the base, and a force sensor arranged at the output end of the exciter 8.

[0072] The first acceleration sensor unit is used to obtain the natural frequency, modal vibration mode and vibration response of the corresponding inner shell 1.

[0073] The second acceleration sensor unit is used to obtain the vibration response of the corresponding base.

[0074] The force sensor is used to obtain the excitation force provided by the exciter 8.

[0075] Specifically, as Figure 5 shown, a single set of first acceleration sensor units includes twelve first acceleration sensors evenly spaced along the radial direction, corresponding to Figure 5 the #1-#12 first acceleration sensors in, among which, the #1 first acceleration sensor is arranged near the excitation position of the inner shell 1.

[0076] A single set of second acceleration sensor units includes four second acceleration sensors, corresponding to Figure 5 the #13-#16 second acceleration sensors in.

[0077] Force sensor corresponding Figure 5 to the #17 force sensor in it;

[0078] In addition, a third acceleration sensor unit is respectively arranged on the inner side wall surface of the outer shell 2 of each double-layer shell ring-ribbed cylindrical shell model. The third acceleration sensor unit is used to test the natural frequency and modal vibration mode of the corresponding outer shell 2;

[0079] A single set of the third acceleration sensor unit includes six third acceleration sensors evenly distributed at intervals along the radial direction, corresponding Figure 5 to the #18-#23 third acceleration sensors in it;

[0080] The third acceleration sensor unit is arranged during the dry modal test. During the underwater test, since the outer shell 2 is in direct contact with the external water medium, the third acceleration sensor unit does not need to be arranged during the underwater test.

[0081] S3. Each double-layer shell ring-ribbed cylindrical shell model is respectively suspended in the air, so as to respectively conduct dry modal tests on each double-layer shell ring-ribbed cylindrical shell model, and obtain the test data in the dry modal test through the sensor assembly;

[0082] During the dry modal test in the air, in this embodiment, a lifting lug assembly 302 is fixed on the cover 3 installed on the top of the cylinder body. The lifting equipment (such as a crane) lifts the corresponding double-layer shell ring-ribbed cylindrical shell model through the lifting lug assembly 302 to suspend it in the air for testing;

[0083] By setting the dry modal test, the acoustic characteristic data such as the natural frequency, modal vibration mode and vibration response of different double-layer shell ring-ribbed cylindrical shell models in the atmospheric environment can be obtained.

[0084] S4. Each double-layer shell ring-ribbed cylindrical shell model is respectively lowered into the ice-covered water area, and a hydrophone assembly is arranged underwater, so as to respectively conduct underwater acoustic radiation tests on each double-layer shell ring-ribbed cylindrical shell model in the ice area environment, and obtain the test data in the underwater acoustic radiation test through the hydrophone assembly;

[0085] When conducting the underwater acoustic radiation test in the ice area environment, in terms of the selection of the test time, it is preferably carried out in winter (December - February) in the northern region, which can ensure that the ice layer in the water area is thicker and stronger. During the test period, windy and snowy weather should be avoided to prevent equipment failures and hose cracking caused by low temperature;

[0086] Before conducting the underwater acoustic radiation test in the ice area environment, the test floating ship needs to be parked in the test water area two months in advance to ensure that the floating ship can be integrated with the ice layer after the water surface freezes;

[0087] When conducting the underwater acoustic radiation test on one of the double-layer shell ring-ribbed cylindrical shell models, the following steps are included:

[0088] S4.1. Install the vibration machine 8 and arrange the sensor assembly inside the double-shell ring-ribbed cylindrical shell model (refer to S2 for the arrangement of the sensor assembly), tie the cables of the vibration machine 8 and the sensor assembly, and pass them through the pagoda head 301 installed on a cover 3 to connect with the external device;

[0089] A hose is installed on the pagoda head 301 through a clamp. The hose is a low-temperature resistant hose. Waterproof glue is applied between the hose and the pagoda head 301 to achieve watertightness. By setting the pagoda head 301, wiring is convenient and the sealing performance inside the inner shell 1 can be guaranteed.

[0090] S4.2. Debug and inspect the sensor components to confirm that the sensor component signals are correct;

[0091] S4.3. Connect a counterweight in series to one end of the rope, and fix the other end of the rope to the bottom of the double-shell ring-stiffened cylindrical shell model; by setting the counterweight, the double-shell ring-stiffened cylindrical shell model is prevented from floating on the water surface, and the double-shell ring-stiffened cylindrical shell model can be kept as stable as possible after entering the water;

[0092] S4.4. Use an ice chiseling tool to cut a hole in the ice surface to select the water entry area;

[0093] In the selection of the test waters, it is necessary to ensure that the waters are at least 20m deep and have an ice thickness of more than 40cm during the peak ice period in winter; the test waters should not be close to the shore, and there should be no power plants, shipyards, docks and other buildings within 2 kilometers. The waters should be open, the bottom of the water should be flat, and the surrounding environment should be quiet;

[0094] Two auxiliary ropes are led out from the cover 3 on the top of the double-shell ring-ribbed cylindrical shell model, and the two auxiliary ropes are used to maintain the double-shell ring-ribbed cylindrical shell model in a stable posture after launching; the two auxiliary ropes can be fixedly suspended by the lifting lug assembly 301;

[0095] S4.5. Pass the lifting rope assembly through the lifting ear assembly 302 on the top cover 3 of the double-shell ring-ribbed cylindrical shell model, and connect the lifting rope assembly to the lifting ring of the equipment during the period;

[0096] According to the diving depth requirements of the double-shell ring-stiffened cylindrical shell model, mark the corresponding positions on the suspension rope assembly;

[0097] S4.6. Lift the double-shell ring-stiffened cylindrical shell model by a lifting device, and lower it into the water through the ice hole. When the mark on the lifting rope assembly approaches the water surface, stop lowering;

[0098] like Figure 6 As shown in the figure, the immersion depth of the double-shell ring-stiffened cylindrical shell model is 5m from the ice surface.

[0099] S4.7. As Figure 8 shown, several ice holes are drilled on the ice surface by an ice chiseling tool, and a hydrophone array is deployed underwater through each ice hole, with one ice hole corresponding to one measurement point;

[0100] As Figure 6 shown, the hydrophone array includes ten serially connected hydrophones, with a spacing of 1 m between adjacent hydrophones, and a heavy object is fixed at the end of the hydrophone array for counterweight; after the hydrophone array enters the water, the uppermost hydrophone in the hydrophone array is 1 m away from the ice surface;

[0101] As Figure 7 shown, five measurement points are arranged, and the five measurement points are evenly distributed along a semi-circular arc with a radius of 20 m, so that the five measurement points cover a 180° area on one side of the ice hole;

[0102] S4.8. Keep the double-layer shell ring-stiffened cylindrical shell model stationary, and obtain background noise data through the hydrophone array;

[0103] By tightening the auxiliary rope, the double-layer shell ring-stiffened cylindrical shell model is kept stationary;

[0104] During the test, avoid the passage of personnel and vehicles on the ice layer of the test water area, ensure that the background noise can meet the test requirements, and require the signal-to-noise ratio to be greater than 6 dB after the equipment is turned on to ensure that the test data is credible and not interfered;

[0105] S4.9. Turn on the shaker 8, move the hydrophone array to traverse the ice holes, and record the vibration acceleration and underwater acoustic data obtained at each measurement point;

[0106] During the test, it is necessary to check the icing conditions of the water-entering ice hole and each ice hole in real time to avoid large-scale icing on the water surface;

[0107] S4.10. Lift the double-layer shell ring-stiffened cylindrical shell model out of the water by a lifting device and place it on the floating ship deck, unload the double-layer shell ring-stiffened cylindrical shell model from the lifting device, and complete the test;

[0108] Replace the next double-layer shell ring-stiffened cylindrical shell model, and repeat steps S4.1. - S4.10 until the tests on all double-layer shell ring-stiffened cylindrical shell models are completed.

[0109] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention is referred to the claims, and any form of modification can be made within the protection scope of the present invention.

Claims

1. A three-dimensional acoustic elastic model test verification method for double-layer shell in ice environment, characterized by: The steps include: S1. constructing a double-shell ring-ribbed cylindrical shell model assembly, wherein the double-shell ring-ribbed cylindrical shell model assembly comprises at least one double-shell ring-ribbed cylindrical shell model; The structure of a single double-shell ring-ribbed cylindrical shell model is as follows: it comprises a cylinder, the top and bottom of which are respectively provided with covers (3), the cylinder comprising an inner shell (1) and an outer shell (2) which are coaxially arranged, the diameter of the outer shell (2) being greater than the diameter of the inner shell (1); A base for carrying a vibration exciter (8) is installed in the inner shell (1), the vibration rod of the vibration exciter (8) is against the inner wall of the inner shell (1), and a plurality of vibration isolators (7) are arranged between the base and the vibration exciter (8); S2. A sensor assembly is arranged on each double-shell ring-ribbed cylindrical shell model, wherein a single sensor assembly comprises a first acceleration sensor unit arranged on the inner wall surface of the inner shell (1), a second acceleration sensor unit arranged on the base, and a force sensor arranged at the output end of the vibration exciter (8); The first acceleration sensor unit is used to obtain the natural frequency, modal vibration shape and vibration response of the corresponding inner shell (1); The second acceleration sensor unit is used to obtain a vibration response of the corresponding base; The force sensor is used to obtain the exciting force provided by the exciter (8); S3. Suspending each double-shell ring-stiffened cylindrical shell model in the air, respectively, so as to perform a dry modal test on each double-shell ring-stiffened cylindrical shell model, and obtaining test data in the dry modal test through a sensor assembly; S4. Each double-shell ring-ribbed cylindrical shell model is lowered into the ice water area respectively, and a hydrophone assembly is arranged underwater, so as to conduct an underwater acoustic radiation test in the ice environment for each double-shell ring-ribbed cylindrical shell model respectively, and obtain test data in the underwater acoustic radiation test through the hydrophone assembly.

2. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 1, characterized in that: In S4, when performing underwater acoustic radiation testing on one of the double-shell ring-stiffened cylindrical shell models, the following steps are included: S4.

1. Install an exciter (8) and arrange a sensor assembly inside the double-shell ring-ribbed cylindrical shell model, tie the cables of the exciter (8) and the sensor assembly together, and pass through a pagoda head (301) installed on a cover (3) to connect to an external device; S4.

2. Debug and inspect the sensor components to confirm that the sensor component signals are correct; S4.

3. Connect one end of the rope in series with a counterweight and fix the other end of the rope to the bottom of the double-shell ring-stiffened cylindrical shell model; S4.

4. Use an ice chiseling tool to cut a hole in the ice surface to select the water entry area; S4.

5. Pass the lifting rope assembly through the lifting ear assembly (302) on the top cover (3) of the double-shell ring-ribbed cylindrical shell model, and connect the lifting rope assembly to the lifting ring of the equipment during the period; According to the diving depth requirements of the double-shell ring-stiffened cylindrical shell model, mark the corresponding positions on the suspension rope assembly; S4.

6. Lift the double-shell ring-stiffened cylindrical shell model by the lifting equipment, and lower it into the water through the ice hole. When the mark on the lifting rope assembly approaches the water surface, stop lowering; S4.

7. Use an ice chiseling tool to drill several holes in the ice surface, and deploy a hydrophone array underwater through each hole. One hole in the ice corresponds to one measuring point. S4.

8. Keep the double-shell ring-stiffened cylindrical shell model stationary and obtain background noise data through the hydrophone array; S4.

9. Turn on the vibration machine (8), move the hydrophone array to traverse the ice hole, and record the vibration acceleration and hydroacoustic data obtained at each measuring point; S4.

10. Lift the double-shell ring-stiffened cylindrical shell model from the water by means of a lifting device and place it on the deck of a floating vessel, then remove the double-shell ring-stiffened cylindrical shell model from the lifting device to complete the test.

3. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 2, characterized in that: In S4.1., a hose is installed on the pagoda head (301) via a clamp, and waterproof glue is applied between the hose and the pagoda head (301) to achieve watertightness.

4. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 2, characterized in that: In S4.4., two auxiliary ropes are led out from the cover (3) on the top of the double-shell ring-stiffened cylindrical shell model, and the two auxiliary ropes are used to maintain the double-shell ring-stiffened cylindrical shell model in a stable posture after being launched into the water.

5. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 2, characterized in that: In S4.6., the immersion depth of the double-shell ring-stiffened cylindrical shell model is 5 m from the ice surface.

6. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 2, characterized in that: In S4.7., the hydrophone array comprises ten hydrophones connected in series, the distance between two adjacent hydrophones is 1 m, and weights are fixed at the ends of the hydrophone array for counterweighting; After the hydrophone array enters the water, the uppermost hydrophone in the hydrophone array is 1 meter away from the ice surface.

7. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in an ice environment according to claim 2, characterized in that: In S4.7., five measuring points are arranged, and the five measuring points are evenly distributed along a semicircular arc with a radius of 20m, so that the five measuring points cover a 180° area on one side of the ice cave.

8. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 1, characterized in that: In S1, the double-shell ring-stiffened cylindrical shell model assembly includes at least three double-shell ring-stiffened cylindrical shell models; The outer shell (2) of one of the double-shell ring-stiffened cylindrical shell models is made of steel, and an acoustic covering layer (201) is laid on the outer wall surface of the outer shell (2); The outer shell (2) of another double-shell ring-stiffened cylindrical shell model is made of steel; The outer shell (2) of the double-shell ring-ribbed cylindrical shell model steel is made of glass fiber reinforced plastic.

9. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 1, characterized in that: In S2, the single group of first acceleration sensor units includes twelve first acceleration sensors evenly spaced apart in the radial direction; The single group of second acceleration sensor units includes four second acceleration sensors.

10. The method for verifying the three-dimensional acoustic elastic model test of double-layer shell in ice environment according to claim 1, characterized in that: In S3, a third acceleration sensor unit is arranged on the inner wall surface of the outer shell (2) of each double-shell ring-ribbed cylindrical shell model, and the third acceleration sensor unit is used to test the natural frequency and modal vibration shape of the corresponding outer shell (2); The single group of third acceleration sensor units includes six third acceleration sensors evenly spaced apart in the radial direction.

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