Real-scale cabin section model adaptable to external pressure test device and test method of real-scale cabin section model

Abstract

The invention provides a real-scale cabin section model adaptable to an external pressure test device and a test method of the real-scale cabin section model. The full-scale cabin section model comprises a bow end pressure-resistant spherical cabin wall section, a first conical shell section, a conical ring cylindrical shell section, a first cylindrical shell section, a second conical shell section, a third conical shell section and a second cylindrical shell section which are sequentially welded; and the thicknesses, materials and sizes of the bow end pressure-resistant spherical bulkhead section, the first conical shell section, the conical ring cylindrical shell section, the first cylindrical shell section, the second conical shell section, the third conical shell section and the second cylindrical shell section are the same as the actual size of the underwater vehicle. The real-scale cabin section model can examine the strength of various pressure-resistant structures and the bearing capacity of a typical cabin section under the actual process condition, the test cost can be reduced, the test period can be shortened, and meanwhile the test accuracy of the real-scale cabin section model is high.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater vehicle design, and in particular to a full-scale cabin model adaptable to an external pressure test device and a test method thereof. Background Art

[0002] Currently, during the initial design phase of an underwater vehicle's structure, a theoretical design is developed to meet the required specifications. Simultaneously, the designed structure is tested to determine if it meets the required strength. If not, the initial design is modified to ensure it meets the required strength. However, due to the cost of testing underwater vehicle structural strength, it's not feasible to create a test model with the exact same dimensions and load-bearing capacity as the actual underwater vehicle structure for verification of its strength and stability.

[0003] The existing technology usually scales down the underwater vehicle to a certain ratio. There is a certain deviation between the scaled model and the actual structure. The structural strength and stability of the scaled model cannot accurately represent the actual structural strength of the underwater vehicle. Summary of the Invention

[0004] The main purpose of the present invention is to provide a full-scale cabin model that can adapt to an external pressure test device and a test method thereof, aiming to reduce the test cost and shorten the test cycle.

[0005] To achieve the above-mentioned objectives, the present invention provides a full-scale cabin section model that can adapt to an external pressure test device, comprising a bow pressure-resistant spherical bulkhead section, a first conical shell section, a conical ring cylindrical shell section, a first cylindrical shell section, a second conical shell section, a third conical shell section and a second cylindrical shell section welded in sequence, wherein the thickness, material and size of the bow pressure-resistant spherical bulkhead section, the first conical shell section, the conical ring cylindrical shell section, the first cylindrical shell section, the second conical shell section, the third conical shell section and the second cylindrical shell section are all the same as the actual size of the underwater vehicle.

[0006] Preferably, the end of the first conical shell segment with a smaller opening area is welded to the bow pressure-resistant spherical bulkhead segment, and the end of the first conical shell segment with a larger opening area is welded to the conical ring cylindrical shell segment.

[0007] Preferably, the end of the third conical shell segment with a smaller opening area is welded to the second conical shell segment, and the end of the first conical shell segment with a larger opening area is welded to the second cylindrical shell segment; the shell thickness of the second conical shell segment is greater than the shell thickness of the first cylindrical shell segment and the third conical shell segment.

[0008] Preferably, the first conical shell segment is a right cone, and the third conical shell segment is an oblique cone; the angle between the generatrix of the cone corresponding to the first conical shell segment and the horizontal direction is 10°~15°.

[0009] Preferably, two extra-large ribs are provided at the middle and tail of the full-scale compartment model. Extra-large ribs refer to ribs whose moment of inertia is 40 times or more than the moment of inertia of the hull ribs, and the distance between the two extra-large ribs is 11500 mm to 12500 mm.

[0010] Preferably, the angle formed by the generatrix of the cone corresponding to the third conical shell segment and the bottom surface is greater than or equal to 75°.

[0011] Preferably, the end of the second conical shell segment with a smaller opening area is welded to the first cylindrical shell segment, and the end of the second conical shell segment with a larger opening area is welded to the second conical shell segment.

[0012] Preferably, the bow pressure-resistant spherical bulkhead section, the first cylindrical shell section and the second cylindrical shell section are all provided with openings, and the openings are all equipped with reinforcement structures.

[0013] Preferably, the distance between the two super-large ribs is the maximum value of the distance between the two bulkheads of an actual underwater vehicle.

[0014] The present invention also proposes a test method for a full-scale cabin model based on the above-mentioned adaptable external pressure test device, comprising the following steps: Attach strain gauges to areas of concern on the full-scale tank model and complete the strain gauge wiring; Seal the end faces of the full-scale compartment model with a special test head, and seal all openings on the full-scale compartment model; Placing the assembled full-scale cabin model adaptable to the external pressure test device inside the external pressure test device; After water is injected into the external pressure test device, a pressure test is carried out on the full-scale compartment model and the test results are recorded.

[0015] The full-scale cabin model that can adapt to the external pressure test device proposed in the present invention has the following beneficial effects: 1. The actual scale, actual material and process conditions are adopted, and the load conditions are also simulated by a large external pressure test device to be consistent with the actual load of the actual boat. This can well control the mutual influence between various structures, making the test results more consistent with the actual boat; 2. This full-scale compartment model integrates a variety of typical pressure-resistant structures of underwater vehicles, and can simultaneously verify the strength of multiple typical pressure-resistant structures in one external pressure test, greatly improving the verification efficiency; 3. The full-scale compartment model proposed in the present invention has the advantages of simple structure and easy implementation, which can reduce the test cost and shorten the test cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A longitudinal sectional view of a full-scale cabin model of the external pressure test device of the present invention; Figure 2 A top view of a full-scale cabin model of the external pressure test device of the present invention; Figure 3 This is a schematic structural diagram of a full-scale cabin model adaptable to an external pressure test device according to the present invention within the external pressure test device.

[0017] In the figure, 1-bow pressure-resistant spherical bulkhead section; 2-first conical shell section; 3-conical ring cylindrical shell section; 4-first cylindrical shell section; 5-second conical shell section; 6-third conical shell section; 7-second cylindrical shell section; 8-special-shaped welding pad; 9-spherical bulkhead opening structure; 10-cylindrical shell oblique opening structure; 11-cylindrical shell orthogonal opening structure; 12-extra-large rib; 13-external pressure test device; 14-special test head.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that in the description of the present invention, the terms "transverse," "longitudinal," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] The present invention proposes a full-scale cabin model that can adapt to an external pressure test device.

[0022] In this preferred embodiment, a full-scale cabin section model adaptable to an external pressure test device comprises a sequentially welded bow pressure-resistant spherical bulkhead section 1, a first conical shell section 2, a conical annular cylindrical shell section 3 (the conical annular cylindrical shell is a common structure in the prior art), a first cylindrical shell section 4, a second conical shell section 5, a third conical shell section 6, and a second cylindrical shell section 7. The thickness, material, and dimensions of the bow pressure-resistant spherical bulkhead section 1, the first conical shell section 2, the conical annular cylindrical shell section 3, the first cylindrical shell section 4, the second conical shell section 5, the third conical shell section 6, and the second cylindrical shell section 7 are all consistent with the actual dimensions of the underwater vehicle. The shell thickness of the second conical shell section 5 is greater than that of the first cylindrical shell section 4 and the third conical shell section 6.

[0023] Specifically, in this embodiment, the end with the smaller opening area of the first conical shell segment 2 is welded to the bow pressure-resistant spherical bulkhead segment 1, and the end with the larger opening area of the first conical shell segment 2 is welded to the conical ring cylindrical shell segment 3. The end with the smaller opening area of the third conical shell segment 6 is welded to the second conical shell segment 5, and the end with the larger opening area of the first conical shell segment 2 is welded to the second cylindrical shell segment 7. The end with the smaller opening area of the second conical shell segment 5 is welded to the first cylindrical shell segment 4, and the end with the larger opening area of the second conical shell segment 5 is welded to the second conical shell segment 5.

[0024] In this embodiment, the first conical shell segment 2 is a right cone, and the third conical shell segment 6 is an oblique cone; the angle between the generatrix of the cone corresponding to the first conical shell segment 2 and the horizontal direction is 10°-15°.

[0025] The middle and tail parts of the full-scale compartment model are both equipped with super-large ribs 12. Super-large ribs 12 refer to ribs with a moment of inertia that is 40 times or more than the moment of inertia of the hull ribs. The distance between two super-large ribs 12 is 11,500 mm to 12,500 mm.

[0026] Specifically, the angle formed by the generatrix of the cone corresponding to the third conical shell segment 6 and the bottom surface is greater than or equal to 75°.

[0027] Furthermore, the bow pressure-resistant spherical bulkhead section 1, the first cylindrical shell section 4, and the second cylindrical shell section 7 are all provided with openings, each of which is equipped with a supporting reinforcement structure. Specifically, the first cylindrical shell section 4 and the second cylindrical shell section 7 are respectively provided with a cylindrical shell oblique opening structure and a cylindrical shell orthogonal opening structure 11.

[0028] By setting up a reinforced structure, the final pressure test data is made more effective.

[0029] In this embodiment, the distance between the inner sidewall of the third conical shell segment 6 and the super-large ribs 12 of the second cylindrical shell segment 7 is the maximum value of the distance between the two bulkheads of an actual underwater vehicle (i.e., the longest cabin length). The distance between the two super-large ribs is the cabin length.

[0030] The design adopts the actual ship structure size, and the model is made of high-strength steel used for the pressure-resistant hull of underwater vehicles.

[0031] When an underwater vehicle is operating underwater, the thickness of each structure must be designed based on the pressure it will experience during navigation. Therefore, the thickness of each structure significantly impacts the vehicle's structural strength. To truly test the vehicle's structural strength, the design method of the present invention designs the thickness of each model structure to be identical to the thickness of the corresponding structure on the underwater vehicle. In addition to thickness, structural size is also a significant factor affecting structural strength. The present invention uses the same dimensions as the corresponding structures on the underwater vehicle. Furthermore, cabin length is a key factor influencing the ultimate load-bearing capacity. The present invention uses the longest cabin length of this type of underwater vehicle to verify the ultimate load-bearing capacity of the actual vessel.

[0032] When designing the dimensions, full consideration should be given to the feasibility of testing the full-scale cabin structure in a large-scale external pressure test device. An appropriate distance should be left between the periphery and the wall of the test device to ensure the installation of the transport track and trolley at the bottom of the external pressure test device, to ensure the limitation of the test device in the length direction, etc.

[0033] In this embodiment, the radius of the bow pressure-resistant spherical bulkhead section 1 is 3600mm, and the diameter at the end opening is 6400mm. The angle between the generatrix of the first conical shell section 2 and the horizontal direction is 12.09°. The front end of the first conical shell section 2 is connected to the bow pressure-resistant spherical bulkhead, so the diameter of the front end is 6400mm, and the diameter of the rear end of the first conical shell section 2 is 6832mm. In order to form a streamlined connection between the first conical shell section 2 and the first cylindrical shell section 4, the diameter of the conical shell section 3 at the connection end with the first conical shell section 2 is 6832mm, and the diameter of the connection end with the first cylindrical shell section 4 is 7000mm. The inner diameter of the first cylindrical shell section 4 is 7000mm. To create a streamlined second conical shell segment 5 between the first cylindrical shell segment 4 and the third conical shell segment 6, the diameter of the second conical shell segment 5 at the connection with the first cylindrical shell segment 4 is 7000 mm, and the diameter at the connection with the third conical shell segment 6 is 7100 mm. The diameter of the third conical shell segment 6 is 7100 mm at the front end and 7400 mm at the rear end. The diameter of the second cylindrical shell 7 connecting the rear end of the third conical shell segment 6 is 7400 mm. The longitudinal distance between the two oversized ribs 12 is 12000 mm.

[0034] The full-scale cabin model that can adapt to the external pressure test device proposed in the present invention has the following beneficial effects: 1. The actual scale, actual material and process conditions are adopted, and the load conditions are also simulated by a large external pressure test device to be consistent with the actual load of the actual boat. This can well control the mutual influence between various structures, making the test results more consistent with the actual boat; 2. This full-scale compartment model integrates a variety of typical pressure-resistant structures of underwater vehicles, and can simultaneously verify the strength of multiple typical pressure-resistant structures in one external pressure test, greatly improving the verification efficiency; 3. The full-scale compartment model proposed in the present invention has the advantages of simple structure and easy implementation, which can reduce the test cost and shorten the test cycle.

[0035] The present invention also proposes a test method for a full-scale cabin model that can adapt to an external pressure test device.

[0036] In this preferred embodiment, a test method based on a full-scale cabin model of the above-mentioned adaptable external pressure test device includes the following steps: Step S10: attach strain gauges to the locations of interest on the full-scale cabin model and complete the strain gauge wiring. Step S20: Seal the end face of the full-scale cabin model with a dedicated test head 14, and seal all openings on the full-scale cabin model at the same time; Step S30, placing the assembled full-scale cabin model adaptable to the external pressure test device inside the external pressure test device; Step S40: After water is injected into the external pressure test device, a pressure test is performed on the full-scale cabin model, and the test results are recorded.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A full-scale cabin model adaptable to an external pressure test device, characterized in that: It includes a bow pressure-resistant spherical bulkhead section, a first conical shell section, a conical ring cylindrical shell section, a first cylindrical shell section, a second conical shell section, a third conical shell section and a second cylindrical shell section welded in sequence, wherein the thickness, material and size of the bow pressure-resistant spherical bulkhead section, the first conical shell section, the conical ring cylindrical shell section, the first cylindrical shell section, the second conical shell section, the third conical shell section and the second cylindrical shell section are the same as the actual size of the underwater vehicle.

2. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: The end with the smaller opening area of the first conical shell segment is welded to the bow pressure-resistant spherical bulkhead segment, and the end with the larger opening area of the first conical shell segment is welded to the conical ring cylindrical shell segment; the shell thickness of the second conical shell segment is greater than the shell thickness of the first cylindrical shell segment and the third conical shell segment.

3. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: The end of the third conical shell segment with a smaller opening area is welded to the second conical shell segment, and the end of the first conical shell segment with a larger opening area is welded to the second cylindrical shell segment.

4. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: The first conical shell segment is a right cone, and the third conical shell segment is an oblique cone; the angle between the generatrix of the cone corresponding to the first conical shell segment and the horizontal direction is 10°~15°.

5. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: Super-large ribs are provided at the middle and tail parts of the full-scale cabin section. Super-large ribs refer to ribs with a moment of inertia that is 40 times or more than the moment of inertia of the hull ribs. The distance between two super-large ribs is 11500mm ~ 12500mm.

6. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: The angle formed by the generatrix of the cone corresponding to the third conical shell segment and the bottom surface is greater than or equal to 75°.

7. The full-scale cabin model of the external pressure test device according to claim 1, characterized in that: The end of the second conical shell segment with a smaller opening area is welded to the first cylindrical shell segment, and the end of the second conical shell segment with a larger opening area is welded to the second conical shell segment.

8. The full-scale cabin model of the external pressure test device according to any one of claims 1 to 7, characterized in that: The bow pressure-resistant spherical bulkhead section, the first cylindrical shell section and the second cylindrical shell section are all provided with openings, and the openings are all equipped with reinforcement structures.

9. The full-scale cabin model of the external pressure test device according to claim 5, characterized in that: The distance between the inner side wall of the third conical shell segment and the super-large rib of the second cylindrical shell segment is the maximum value of the distance between the two bulkheads of an actual underwater vehicle.

10. A test method for a full-scale cabin model based on the external pressure adaptable test device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Attach strain gauges to areas of concern on the full-scale tank model and complete the strain gauge wiring; Seal the end faces of the full-scale compartment model with a special test head, and seal all openings on the full-scale compartment model; Placing the assembled full-scale cabin model adaptable to the external pressure test device inside the external pressure test device; After water is injected into the external pressure test device, a pressure test is carried out on the full-scale compartment model and the test results are recorded.

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