A low-radiation noise double-layer bottom plate frame structure

Abstract

The application provides a low-radiation-noise double-layer bottom plate frame structure, relates to the field of vibration reduction and noise reduction, and comprises an inner bottom plate, an outer bottom plate, first rib plates, second rib plates and reinforcing trusses. All the first rib plates, all the second rib plates and all the reinforcing trusses are arranged between the inner bottom plate and the outer bottom plate. The two sides of each reinforcing truss are fixedly connected with the inner bottom plate and the outer bottom plate respectively. Each first rib plate is fixedly connected with the inner bottom plate, and each first rib plate can be fixedly connected with at least one reinforcing truss. Each second rib plate is fixedly connected with the outer bottom plate, and each second rib plate can be fixedly connected with at least one reinforcing truss. Each first rib plate and each second rib plate do not contact each other. The application can better reduce the underwater radiation noise of the low-radiation-noise double-layer bottom plate frame structure.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and noise reduction technology, and in particular to a low-radiation noise double-layer base plate frame structure. Background Technology

[0002] During operation, ships generate various forms of vibration under the excitation of main and auxiliary engines. These vibrations are transmitted through the hull structure, causing the ship to radiate noise. For military vessels, good acoustic design can not only shorten the distance at which the ship can be detected by detection equipment, but also effectively reduce the identification capability of anti-ship weapons, thereby improving the ship's combat and survivability. For civilian vessels, good vibration reduction and noise reduction design can improve the working environment of the crew, increase crew efficiency, and better protect the hull structure and high-precision equipment inside the ship.

[0003] In ship vibration reduction and noise reduction design, the radiated noise of the ship can be reduced by controlling the propagation path of bending waves. Ships are generally mainly composed of hull structure (frame structure) and bottom plate structure. The excitation of the main and auxiliary engines is transmitted to the hull bottom plate structure, causing the hull bottom plate structure to vibrate and propagate in the form of waves in the bottom plate structure, and then transmitted to the water through the outer bottom plate of the bottom plate structure.

[0004] like Figure 1 As shown, a traditional double-bottom plate frame structure generally includes an inner bottom plate, an outer bottom plate, and multiple ribs 11. The upper and lower sides of the ribs 11 are fixedly connected to the inner bottom plate and the outer bottom plate, respectively. The ribs 11, the inner bottom plate, and the outer bottom plate are an integral structure with a large connection strength. This results in a large local resonance frequency in the existing double-bottom plate frame structure, which leads to a poor effect on reducing low-frequency noise radiation and a poor overall effect on reducing the ship's radiated noise. Summary of the Invention

[0005] The purpose of this invention is to provide a low-radiation-noise double-layer bottom plate frame structure to solve the problems existing in the prior art and to better reduce the underwater radiated noise of the ship's double-layer bottom plate frame structure.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a low-radiation noise double-layer base plate frame structure, including an inner base plate, an outer base plate, a first rib, a second rib, and reinforcing trusses. Multiple first ribs, second ribs, and reinforcing trusses are provided. All first ribs, second ribs, and reinforcing trusses are disposed between the inner base plate and the outer base plate. Each reinforcing truss has its two sides fixedly connected to the inner base plate and the outer base plate, respectively. Each first rib is fixedly connected to the inner base plate and can be fixedly connected to at least one reinforcing truss. Each second rib is fixedly connected to the outer base plate and can be fixedly connected to at least one reinforcing truss. Each first rib and each second rib does not contact each other.

[0008] Preferably, each first rib includes a first web and a first wing, each second rib includes a second web and a second wing, one side of each first web is fixedly connected to one side surface of a first wing, the other side of each first web is fixedly connected to the inner bottom plate, one side of each second web is fixedly connected to one side surface of a second wing, the other side of each second web is fixedly connected to the outer bottom plate, at least one end of the first web and / or the first wing is fixedly connected to the reinforcing truss, and at least one end of the second web and / or the second wing is fixedly connected to the reinforcing truss.

[0009] Preferably, it further includes a first outer side plate and a second outer side plate, the first outer side plate and the second outer side plate are respectively disposed on both sides of the inner bottom plate in the width direction, one side of the first outer side plate is fixedly connected to one side of the inner bottom plate, and the other side of the first outer side plate is fixedly connected to one side of the outer bottom plate, one side of the second outer side plate is fixedly connected to the other side of the inner bottom plate, and the other side of the second outer side plate is fixedly connected to the other side of the outer bottom plate.

[0010] Preferably, all the reinforcing trusses are spaced apart along the width direction of the inner bottom plate, a plurality of first ribs are spaced apart along the length direction of the inner bottom plate and form a first rib group, a plurality of second ribs are spaced apart along the length direction of the outer bottom plate and form a second rib group, a first rib group and a second rib group are provided between two adjacent reinforcing trusses, a first rib group and a second rib group are provided between the first side outer plate and an adjacent reinforcing truss, a first rib group and a second rib group are provided between the second side outer plate and an adjacent reinforcing truss, and a first rib group and a second rib group are provided between two adjacent reinforcing trusses respectively. The two ends of any one of the first ribs are fixedly connected. The first side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the first ribs between them. The second side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the first ribs between them. The two adjacent reinforcing trusses are respectively fixedly connected to the two ends of any one of the second ribs between them. The first side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the second ribs between them. The second side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the second ribs between them.

[0011] Preferably, each of the first ribs is disposed opposite to one of the second ribs, and a gap is left between the oppositely disposed first ribs and second ribs.

[0012] Preferably, the distance between all adjacent first ribs in all first rib groups is equal, and the distance between all adjacent second ribs in all second rib groups is equal.

[0013] Preferably, it further includes at least one first longitudinal bone, and at least one first longitudinal bone is fixedly connected to the surface of the inner bottom plate near and / or away from the reinforcing truss.

[0014] Preferably, it further includes at least one second longitudinal bone, and at least one second longitudinal bone is fixedly connected to the surface of the outer bottom plate near and / or away from the reinforcing truss.

[0015] Preferably, it further includes at least one third longitudinal bone, and at least one of the third longitudinal bones is fixedly connected to the inner surface of the first side outer plate and / or the inner surface of the second side outer plate.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The low-radiation noise double-layer base plate frame structure provided by the present invention includes an inner base plate, an outer base plate, a first rib, a second rib, and a reinforcing truss. All first ribs, all second ribs, and all reinforcing trusses are disposed between the inner base plate and the outer base plate. The two sides of each reinforcing truss are fixedly connected to the inner base plate and the outer base plate, respectively. Each first rib is fixedly connected to the inner base plate and can be fixedly connected to at least one reinforcing truss. Each second rib is fixedly connected to the outer base plate and can be fixedly connected to at least one reinforcing truss. Each first rib and each second rib do not contact each other.

[0018] The low-radiation noise double-layer bottom plate frame structure of this invention replaces the integrated rib plate of the traditional double-layer bottom plate frame structure with a first rib plate and a second rib plate. There is no connection between the first rib plate and the second rib plate. While ensuring the strength of the bottom plate frame structure, the connection strength between the inner and outer bottom plates is reduced, forming a weak boundary condition for the bottom plate frame structure. This lowers the local resonance frequency of the bottom plate frame structure. In the frequency domain, the local resonance bandgap of the bottom plate frame structure shifts to lower frequencies, which can better coincide with the peak value of the low-frequency excitation frequency line spectrum of the bending waves generated by the operation of equipment in the ship. This allows the high-energy bending waves generated by the operation of equipment in the ship to fall more effectively within the local resonance bandgap range of the bottom plate frame structure, thereby significantly reducing the vibration and noise of the bottom plate frame structure and the hull structure. This better achieves the effect of reducing the low-frequency underwater radiated noise of the bottom plate frame structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an existing low-radiation noise double-layer base plate frame structure in the background art;

[0021] Figure 2 This is a schematic diagram of the low-radiation noise double-layer bottom plate frame structure in Example 1;

[0022] Figure 3 This is a schematic diagram of the low-radiation noise double-layer bottom plate frame structure in Example 1 (excluding the second side outer plate);

[0023] Figure 4 This is a schematic diagram of the structure of the first and second ribs in Example 1;

[0024] Figure 5 This is a comparison curve of underwater radiated noise between the low-radiated noise double-layer bottom plate frame structure in Example 1 and the traditional plate frame structure.

[0025] In the diagram: 100, low-radiation noise double-layer bottom plate frame structure; 1, inner bottom plate; 2, outer bottom plate; 3, first rib plate; 301, first web plate; 302, first wing plate; 4, second rib plate; 401, second web plate; 402, second wing plate; 5, reinforcing truss; 6, first side outer plate; 7, second side outer plate; 8, first longitudinal bone; 9, second longitudinal bone; 10, third longitudinal bone; 11, rib plate. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide a low-radiation noise double-layer bottom plate frame structure to solve the problems existing in the prior art and to better reduce the underwater radiation noise of the low-radiation noise double-layer bottom plate frame structure.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 2-4 As shown, this embodiment provides a low-radiation noise double-layer base plate frame structure 100, including an inner base plate 1, an outer base plate 2, a first rib plate 3, a second rib plate 4, and a reinforcing truss 5. There are multiple first rib plates 3, second rib plates 4, and reinforcing trusses 5. All first rib plates 3, all second rib plates 4, and all reinforcing trusses 5 are disposed between the inner base plate 1 and the outer base plate 2. The two sides of each reinforcing truss 5 are fixedly connected to the inner base plate 1 and the outer base plate 2, respectively. Each first rib plate 3 is fixedly connected to the inner base plate 1, and each first rib plate 3 can be fixedly connected to at least one reinforcing truss 5. Each second rib plate 4 is fixedly connected to the outer base plate 2, and each second rib plate 4 can be fixedly connected to at least one reinforcing truss 5. Each first rib plate 3 and each second rib plate 4 do not contact each other.

[0030] When the main and auxiliary engines and other equipment operating within the ship generate low-frequency excitations to the hull structure, bending waves propagate along the hull structure, reaching the low-radiation noise double-layer bottom plate frame structure 100, and subsequently radiating noise underwater. In the radiated noise generated by a ship, high-frequency noise attenuates quickly, while low-frequency noise attenuates slowly and propagates far. Therefore, to achieve low-noise design of the ship structure, it is primarily necessary to control low-frequency noise. The underwater radiated noise of a ship is mainly determined by the low-frequency line spectrum of the mechanical noise generated by the ship's main and auxiliary engines. The low-radiation noise double-layer bottom plate frame structure 100 of this invention replaces the integrated rib plate of the traditional double-layer bottom plate frame structure with a first rib plate 3 and a second rib plate 4. There is no connection between the first rib plate 3 and the second rib plate 4. While ensuring the strength of the bottom plate frame structure, the connection strength between the inner bottom plate 1 and the outer bottom plate 2 is reduced, forming a weak boundary condition for the bottom plate frame structure. This reduces the local resonance frequency of the bottom plate frame structure. In the frequency domain, the local resonance bandgap of the bottom plate frame structure shifts to a lower frequency, that is, the local resonance frequency of the bottom plate frame structure and the outer bottom plate 2 is reduced. This allows it to better coincide with the peak value of the low-frequency excitation frequency line spectrum of the bending waves generated by the operation of equipment in the ship. This enables the bending waves generated by the operation of equipment in the ship to fall more within the local resonance bandgap range of the bottom plate frame structure, thereby significantly reducing the vibration and noise of the bottom plate frame structure and the hull structure. This better achieves the effect of reducing the low-frequency underwater radiated noise of the bottom plate frame structure.

[0031] In this embodiment, each first rib 3 includes a first web 301 and a first wing 302, and each second rib 4 includes a second web 401 and a second wing 402. One side of each first web 301 is fixedly connected to one side surface of a first wing 302, and the other side of each first web 301 is fixedly connected to the inner bottom plate 1. One side of each second web 401 is fixedly connected to one side surface of a second wing 402, and the other side of each second web 401 is fixedly connected to the outer bottom plate 2. At least one end of the first web 301 and / or the first wing 302 is fixedly connected to the reinforcing truss 5, and at least one end of the second web 401 and / or the second wing 402 is fixedly connected to the reinforcing truss 5. The cross-sections of both the first rib 3 and the second rib 4 are T-shaped, which is beneficial for improving the strength of the low-radiation noise double-layer bottom plate frame structure 100.

[0032] In this embodiment, a first outer plate 6 and a second outer plate 7 are also included. The first outer plate 6 and the second outer plate 7 are respectively disposed on both sides of the inner bottom plate 1 in the width direction. One side of the first outer plate 6 in the height direction is fixedly connected to one side of the inner bottom plate 1 in the width direction, and the other side of the first outer plate 6 in the height direction is fixedly connected to one side of the outer bottom plate 2 in the width direction. One side of the second outer plate 7 in the height direction is fixedly connected to the other side of the inner bottom plate 1 in the width direction, and the other side of the second outer plate 7 in the height direction is fixedly connected to the other side of the outer bottom plate 2 in the width direction.

[0033] In this embodiment, all reinforcing trusses 5 are spaced apart along the width direction of the inner bottom plate 1, multiple first ribs 3 are spaced apart along the length direction of the inner bottom plate 1 and form a first rib group, multiple second ribs 4 are spaced apart along the length direction of the outer bottom plate and form a second rib group, a first rib group and a second rib group are provided between two adjacent reinforcing trusses 5, a first rib group and a second rib group are provided between the first side outer plate 6 and the adjacent reinforcing trusses 5, a first rib group and a second rib group are provided between the second side outer plate 7 and the adjacent reinforcing trusses 5, and any two adjacent reinforcing trusses 5 are respectively connected to any two of them. The two ends of a first rib 3 are fixedly connected. The first side outer plate 6 and the adjacent reinforcing truss 5 are respectively fixedly connected to the two ends of any one of the first ribs 3. The second side outer plate 7 and the adjacent reinforcing truss 5 are respectively fixedly connected to the two ends of any one of the first ribs 3. The two adjacent reinforcing trusses 5 are respectively fixedly connected to the two ends of any one of the second ribs 4. The first side outer plate 6 and the adjacent reinforcing truss 5 are respectively fixedly connected to the two ends of any one of the second ribs 4. The second side outer plate 7 and the adjacent reinforcing truss 5 are respectively fixedly connected to the two ends of any one of the second ribs 4.

[0034] In this embodiment, each first rib 3 is arranged opposite to a second rib 4, and there is a gap between the oppositely arranged first rib 3 and second rib 4. That is, a first rib 3 and a second rib 4 are arranged vertically opposite each other, and there is a gap between the first rib 3 and the second rib 4 directly below it.

[0035] In this embodiment, the distance between all adjacent first ribs 3 in all first rib groups is equal, and the distance between all adjacent second ribs 4 in all second rib groups is equal.

[0036] In this embodiment, at least one first longitudinal bone 8 is also included, and at least one first longitudinal bone 8 is fixedly connected to the surface of the inner bottom plate 1 near and / or away from the reinforcing truss 5.

[0037] In a preferred embodiment, there are multiple first longitudinal ribs 8, all of which are fixedly connected to the surface of the inner bottom plate 1 away from the reinforcing truss 5, and all the first longitudinal ribs 8 are spaced apart along the width direction of the inner bottom plate 1.

[0038] In this embodiment, at least one second longitudinal bone 9 is also included, and at least one second longitudinal bone 9 is fixedly connected to the surface of the outer bottom plate 2 near and / or away from the reinforcing truss 5.

[0039] In a preferred embodiment, there are multiple second ribs, and all second longitudinal ribs 9 are fixedly connected to the surface of the outer bottom plate 2 near the reinforcing truss 5. All second longitudinal ribs 9 are spaced apart along the width direction of the outer bottom plate 2.

[0040] In this embodiment, at least one third longitudinal bone 10 is also included, and at least one third longitudinal bone 10 is fixedly connected to the inner surface of the first side outer plate 6 and / or the inner surface of the second side outer plate 7.

[0041] In a preferred embodiment, there are multiple third longitudinal ribs 10. Multiple third longitudinal ribs 10 are fixedly connected to the inner surface of the first side outer plate 6 and the inner surface of the second side outer plate 7. All the third longitudinal ribs 10 on the first side outer plate 6 are spaced apart along the height direction of the first side outer plate 6, and all the third longitudinal ribs 10 on the second side outer plate 7 are spaced apart along the height direction of the first side outer plate 6.

[0042] In this embodiment, the first rib plate 3, the reinforcing truss 5, the first side outer plate 6, the second side outer plate 7, and the first longitudinal bone 8 are all welded to the inner bottom plate 1. The second rib plate 4, the reinforcing truss 5, the first side outer plate 6, the second side outer plate 7, and the second longitudinal bone 9 are all welded to the outer bottom plate 2. The third longitudinal bone 10 is welded to the corresponding first side outer plate 6 or second side outer plate 7. The first web plate 301 and the first wing plate 302 are welded together. The second web plate 401 and the second wing plate 402 are welded together.

[0043] like Figure 5 As shown, the low-radiation noise double-layer base plate frame structure 100 provided in this embodiment is similar to... Figure 1 The underwater radiated noise curves of both conventional bottom plate frame structures of the same scale were obtained by applying the same excitation. Figure 5 As can be seen from the above, for ships with large low-frequency radiated noise in the 20-40Hz frequency band, the low-radiated noise double-layer bottom plate frame structure 100 provided in this embodiment can achieve radiated noise less than that of traditional bottom plate frame structures in this frequency band. That is, the low-radiated noise double-layer bottom plate frame structure 100 provided in this embodiment can reduce the transmission of bending waves in the 20-40Hz frequency band in the hull structure and reduce the underwater radiated noise of the low-radiated noise double-layer bottom plate frame structure 100.

[0044] When equipment operating within the ship applies low-frequency excitation to the hull structure, bending waves propagate along the truss structure. Specifically, the bending waves are transmitted through the first longitudinal rib 8, reinforcing truss 5, first T-rib, second T-rib, second longitudinal rib 9, and third longitudinal rib 10 of the low-radiation noise double-layer bottom plate frame structure 100 to the inner bottom plate 1, outer bottom plate 2, first side outer plate 6, and second side outer plate 7. Due to the vibration of the outer bottom plate 2, the ship radiates low-frequency noise underwater. In this embodiment, the traditional one-piece rib plate is replaced with the first rib plate 3 and the second rib plate 4, which can reduce the ship's radiated noise.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A low-radiation noise double-layer base plate frame structure, characterized in that: The structure includes an inner base plate, an outer base plate, a first rib, a second rib, and a reinforcing truss. There are multiple first ribs, second ribs, and reinforcing trusses. All first ribs, second ribs, and reinforcing trusses are disposed between the inner base plate and the outer base plate. Each reinforcing truss is fixedly connected to the inner base plate and the outer base plate on both sides. Each first rib is fixedly connected to the inner base plate and can be fixedly connected to at least one reinforcing truss. Each second rib is fixedly connected to the outer base plate and can be fixedly connected to at least one reinforcing truss. Each first rib and each second rib do not contact each other and can cause the local resonant bandgap of the base plate frame structure to shift to low frequencies.

2. The low-radiation noise double-layer base plate frame structure according to claim 1, characterized in that: Each first rib includes a first web and a first wing, and each second rib includes a second web and a second wing. One side of each first web is fixedly connected to one side surface of a first wing, and the other side of each first web is fixedly connected to the inner bottom plate. One side of each second web is fixedly connected to one side surface of a second wing, and the other side of each second web is fixedly connected to the outer bottom plate. At least one end of the first web and / or the first wing is fixedly connected to the reinforcing truss, and at least one end of the second web and / or the second wing is fixedly connected to the reinforcing truss.

3. The low-radiation noise double-layer base plate frame structure according to claim 1, characterized in that: It also includes a first outer side plate and a second outer side plate, which are respectively disposed on both sides of the inner bottom plate in the width direction. One side of the first outer side plate is fixedly connected to one side of the inner bottom plate, and the other side of the first outer side plate is fixedly connected to one side of the outer bottom plate. One side of the second outer side plate is fixedly connected to the other side of the inner bottom plate, and the other side of the second outer side plate is fixedly connected to the other side of the outer bottom plate.

4. The low-radiation noise double-layer base plate frame structure according to claim 3, characterized in that: All the reinforcing trusses are spaced apart along the width direction of the inner bottom plate. Multiple first ribs are spaced apart along the length direction of the inner bottom plate and form a first rib group. Multiple second ribs are spaced apart along the length direction of the outer bottom plate and form a second rib group. One first rib group and one second rib group are provided between two adjacent reinforcing trusses. One first rib group and one second rib group are provided between the first side outer plate and an adjacent reinforcing truss. One first rib group and one second rib group are provided between the second side outer plate and an adjacent reinforcing truss. Adjacent reinforcing trusses are respectively connected to each of the two reinforcing trusses. The two ends of any one of the first ribs are fixedly connected. The first side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the first ribs between them. The second side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the first ribs between them. The two adjacent reinforcing trusses are respectively fixedly connected to the two ends of any one of the second ribs between them. The first side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the second ribs between them. The second side outer plate and the adjacent reinforcing truss are respectively fixedly connected to the two ends of any one of the second ribs between them.

5. The low-radiation noise double-layer base plate frame structure according to any one of claims 1-4, characterized in that: Each of the first ribs is disposed opposite to one of the second ribs, with a gap between the oppositely disposed first ribs and second ribs.

6. The low-radiation noise double-layer base plate frame structure according to any one of claims 4, characterized in that: The distance between all adjacent first ribs in all first rib groups is equal, and the distance between all adjacent second ribs in all second rib groups is equal.

7. The low-radiation noise double-layer base plate frame structure according to any one of claims 1-4, characterized in that: It also includes at least one first longitudinal bone, which is fixedly connected to the surface of the inner bottom plate near and / or away from the reinforcing truss.

8. The low-radiation noise double-layer base plate frame structure according to any one of claims 1-4, characterized in that: It also includes at least one second longitudinal bone, which is fixedly connected to the surface of the outer bottom plate near and / or away from the reinforcing truss.

9. The low-radiation noise double-layer base plate frame structure according to claim 4, characterized in that: It also includes at least one third longitudinal bone, and at least one of the third longitudinal bones is fixedly connected to the inner surface of the first side outer plate and / or the inner surface of the second side outer plate.

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