Large diving depth composite material sound vibration suppression structure

Abstract

The invention provides a large-diving-depth composite material sound vibration suppression structure, belongs to the field of ship vibration reduction and noise reduction, and solves the problem that an existing ship structure is difficult to effectively suppress vibration and reduce noise in an ultra-deep water environment. The large diving depth composite material sound vibration suppression structure comprises an outer shell, an inner shell, a reinforcing structure, a plurality of local resonance round bags and a plurality of dynamic vibration absorbers, the inner shell and the outer shell are coaxially arranged, a containing space is formed between the outer shell and the inner shell, water can enter the containing space through the outer shell, and the reinforcing structure is arranged between the outer shell and the inner shell. The reinforcing structures divide the containing space into a plurality of containing groove sets, each containing groove set comprises a plurality of containing grooves, the local resonance round bags are arranged in the containing grooves, the interiors of the local resonance round bags are vacuum spaces, and the dynamic vibration absorbers are fixedly arranged in the local resonance round bags. The design problem of the ship structure in the ultra-deep water environment is solved, the compression resistance requirement under the large diving depth condition is met, and the good vibration suppression and noise reduction effect can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship vibration reduction and noise reduction, and in particular relates to a composite material acoustic vibration suppression structure with a large diving depth. Background Art

[0002] The 21st century is the century of the ocean, and even more so the century of the deep sea. Deep-sea resources are becoming an emerging growth point for the development of the world economy. With the continuous advancement of science and technology, various fields such as the expansion of marine space and the protection of the marine environment are booming, and mankind is entering a stage of all-round development and utilization of the ocean. As a carrier for completing underwater tasks, underwater vehicles are gradually developing towards the deep sea and need to work stably in the deep sea environment for a long time. Therefore, a series of challenges must be considered in its design and operation process, among which vibration reduction and noise reduction technology is one of the key technologies to ensure the performance and data accuracy of underwater vehicles. When the vehicle is operating in the ocean, frequent mechanical vibration and noise generation will have a negative impact on its own stability and working accuracy. These vibrations will not only affect the stability of the vehicle itself, but also interfere with the measurement accuracy of its precision sensors. Compared with traditional steel materials, composite materials have the advantages of light weight, high strength, and designability, which makes their application in submersibles gradually prominent. However, facing ultra-deep water environment conditions, the acoustic performance of composite material structures is difficult to achieve conventional environmental performance. In order to meet the use requirements, acoustic vibration suppression is required in a high water depth pressure environment. However, in the prior art, there is no relevant research on the acoustic vibration suppression structure of composite materials under deep diving conditions. Summary of the invention

[0003] In view of this, in order to solve the problem that existing ship structures are difficult to effectively suppress vibration and reduce noise in ultra-deep water environments, the present invention proposes a deep-diving composite material acoustic vibration suppression structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A composite acoustic vibration suppression structure with a large diving depth, comprising:

[0006] shell;

[0007] An inner shell, wherein the inner shell and the outer shell are coaxially arranged, and a receiving space is provided between the outer shell and the inner shell, and water can enter the receiving space through the outer shell;

[0008] A plurality of reinforcing structures, wherein the reinforcing structures are arranged between the outer shell and the inner shell, and the reinforcing structures divide the accommodation space into a plurality of accommodation slot groups, wherein the accommodation slot groups include a plurality of accommodation slots, and the plurality of accommodation slot groups are arranged in sequence along the axial direction of the inner shell, and the plurality of accommodation slots of the accommodation slot groups are arranged in sequence along the circumferential direction of the inner shell;

[0009] A plurality of local resonance round bags, wherein the local resonance round bags are arranged in the containing grooves, and the interior of the local resonance round bags is a vacuum space;

[0010] A plurality of dynamic vibration absorbers are respectively fixedly arranged inside the plurality of local resonance circular bags.

[0011] As a preferred solution of the above-mentioned deep diving composite material acoustic vibration suppression structure, the outer shell is made of a water-permeable material, and the inner shell is made of a high-strength and pressure-resistant composite material.

[0012] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, a pressure-resistant rubber layer is fixedly provided on the outer side of the local resonance circle.

[0013] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, two or more local resonance circular bags are arranged in each of the containing grooves.

[0014] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, the natural frequencies of the dynamic vibration absorbers in the same receiving groove group are the same; along the axial direction of the inner shell, the natural frequencies of the dynamic vibration absorbers in multiple receiving groove groups are different.

[0015] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, the dynamic vibration absorber is a distributed multi-stage vibration reduction spring mass system.

[0016] As a preferred solution of the above-mentioned deep diving composite material acoustic vibration suppression structure, the reinforcement structure includes a plurality of longitudinal bones and a plurality of ring ribs, the extension directions of the plurality of longitudinal bones are parallel to the axial direction of the inner shell, the plurality of longitudinal bones are spaced apart along the circumferential direction of the inner shell, the ring ribs include a plurality of ribs, the plurality of ribs are spaced apart along the circumferential direction of the inner shell, the two ends of the ribs are respectively fixedly connected to two adjacent longitudinal bones, the plurality of ring ribs are spaced apart along the axial direction of the inner shell, and the ribs of the two adjacent longitudinal bones and the two adjacent ring ribs form the accommodating groove.

[0017] As a preferred solution of the above-mentioned deep diving composite material acoustic vibration suppression structure, the upper and lower ends of the longitudinal bone are respectively fixedly connected to the outer shell and the inner shell, and the upper and lower ends of the rib are respectively fixedly connected to the outer shell and the inner shell.

[0018] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, the reinforcement structure is made of carbon fiber material.

[0019] As a preferred solution of the above-mentioned large diving depth composite material acoustic vibration suppression structure, both ends of the shell are closed.

[0020] Compared with the prior art, the beneficial effects of the large diving depth composite material acoustic vibration suppression structure provided by the present invention are:

[0021] 1. The present invention provides a large diving depth composite material acoustic vibration suppression structure, which overcomes the problem that existing ship structures are difficult to effectively suppress vibration and reduce noise in ultra-deep water environments, overcomes the design difficulties of ship structures in ultra-deep water environments, and not only ensures the pressure resistance requirements under large diving depth conditions, but also can achieve good vibration suppression and noise reduction effects.

[0022] 2. The present invention provides a composite acoustic vibration suppression structure with a large diving depth. In the composite acoustic vibration suppression structure with a large diving depth, the local resonance circle is a closed structure, and the interior is a vacuum, which achieves the purpose of vibration reduction due to the large difference in impedance. The outer shell is a cylindrical shell with both ends closed, which can be more pressure-resistant. The inner shell is a high-strength pressure-resistant composite material, and the local resonance circle is a vacuum. The impedances of the two are different, which can achieve the purpose of vibration reduction.

[0023] 3. The present invention provides a composite material acoustic vibration suppression structure with a large diving depth. In the composite material acoustic vibration suppression structure with a large diving depth, a pressure-resistant damping layer, i.e., a pressure-resistant rubber layer, is attached to the outside of the local resonance circle. The water pressure will not change the vibration reduction effect of the rubber layer. The damping material can convert mechanical energy into heat energy during vibration, thereby consuming vibration energy. Therefore, a wide-band vibration reduction effect can be achieved, and the effect on high-frequency vibration reduction is obvious.

[0024] 4. The present invention provides a composite acoustic vibration suppression structure with a large diving depth. In the composite acoustic vibration suppression structure with a large diving depth, a dynamic vibration absorber is arranged inside the local resonance circle, dynamic vibration absorbers with different natural frequencies are arranged between different ring ribs, and frequencies of f are arranged in sequence along the axial direction. 1 -f 2 、f 2 -f 3 …f n -f n+1 The frequency range can cover the low frequency range of vibration reduction. A dynamic vibration absorber between each receiving groove has only one natural frequency, so it is a vibration reduction of a specific frequency; the natural frequency of many receiving grooves between every two ring ribs and many dynamic vibration absorbers with different natural frequencies in each receiving groove can cover exactly f 0 -f 1 Such a range; arranging the entire axial direction in sequence can achieve the entire low-frequency vibration reduction. The periodic arrangement of the local resonance circle package around the inner shell can achieve band gap vibration reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 : is a structural schematic diagram of a large diving depth composite material acoustic vibration suppression structure provided by a specific embodiment of the present invention;

[0027] Figure 2 It is a partial structural schematic diagram of a large diving depth composite material acoustic vibration suppression structure provided by a specific embodiment of the present invention;

[0028] Figure 3 is a side view of a large diving depth composite material acoustic vibration suppression structure provided by a specific embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a local resonance circular bag and a dynamic vibration absorber of a large diving depth composite material acoustic vibration suppression structure provided by a specific embodiment of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the outer shell of a composite material acoustic vibration suppression structure with a large diving depth provided by a specific embodiment of the present invention.

[0031] In the figure:

[0032] 1. Shell;

[0033] 2. Inner shell;

[0034] 3. Strengthening structure; 31. Longitudinal bone; 32. Ring rib;

[0035] 4. Local resonance round bag;

[0036] 5. Dynamic vibration absorber;

[0037] 6. Receiving tank. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] See also Figure 1-5 To describe this embodiment, the present invention provides a large diving depth composite material acoustic vibration suppression structure, the large diving depth composite material acoustic vibration suppression structure comprises an outer shell 1, an inner shell 2, a reinforcement structure 3, a plurality of local resonance circular bags 4 and a plurality of dynamic vibration absorbers 5, the inner shell 2 and the outer shell 1 are coaxially arranged, there is a containing space between the outer shell 1 and the inner shell 2, water can enter the containing space through the outer shell 1, the reinforcement structure 3 is arranged between the outer shell 1 and the inner shell 2, the reinforcement structure 3 divides the containing space into a plurality of containing groove groups, the containing groove group comprises a plurality of containing grooves 6, the plurality of containing groove groups are arranged in sequence along the axial direction of the inner shell 2, the plurality of containing grooves 6 of the containing groove group are arranged in sequence along the circumferential direction of the inner shell 2; the local resonance circular bag 4 is arranged in the containing groove 6, the interior of the local resonance circular bag 4 is a vacuum space, and the plurality of dynamic vibration absorbers 5 are respectively fixedly arranged inside the plurality of local resonance circular bags 4.

[0043] In this deep-diving composite material acoustic vibration suppression structure, water can enter the containing space through the outer shell 1, which can balance the internal and external pressures of the outer shell 1 of the aircraft and play a role in pressure resistance. The overall aircraft using this deep-diving composite material acoustic vibration suppression structure can achieve acoustic vibration suppression effects. When the aircraft is sailing, the vibration noise of the equipment is transmitted outward through the inner shell 2, the reinforcement structure 3 and the outer shell 1 in turn. In this process, the local resonance round bag 4 is a closed structure with a vacuum inside, which achieves the purpose of vibration reduction due to the large difference in resistance. The dynamic vibration absorber 5 is a distributed multi-stage vibration reduction spring mass system, which is used to absorb low-frequency line spectrum vibrations. Due to various vibration reduction structures such as the local resonance round bag 4 and the dynamic vibration absorber 5, vibration suppression effects for various frequencies can be achieved.

[0044] This deep-diving composite material acoustic vibration suppression structure solves the problem that existing ship structures are difficult to effectively suppress vibration and reduce noise in ultra-deep water environments, overcomes the design difficulties of ship structures in ultra-deep water environments, and not only ensures the pressure resistance requirements under deep-diving conditions, but also achieves good vibration suppression and noise reduction effects.

[0045] Optionally, the outer shell 1 is made of a water-permeable material. After the aircraft is launched into water, the outer shell 1 is water-permeable, and water can enter between the outer shell 1 and the inner shell 2. The inner shell 2 is water-tight and can balance the internal and external pressures of the outer shell 1 of the aircraft, playing a role in pressure resistance.

[0046] In this embodiment, the outer shell 1 and the inner shell 2 are both cylindrical, and the outer shell 1 and the inner shell 2 form an annular structure, and there is a containing space between the outer shell 1 and the inner shell 2.

[0047] In this embodiment, both ends of the housing 1 are closed. The housing 1 with both ends closed forms a complete cylinder, which can enhance the pressure resistance effect.

[0048] Optionally, the inner shell 2 is made of high-strength pressure-resistant composite material, and the local resonance circle 4 is vacuum, and the impedances of the two are different, which can achieve the purpose of vibration reduction. Specifically, the reinforcement structure 3 and the inner shell 2 are made of carbon fiber material, which can achieve the purpose of pressure resistance.

[0049] Optionally, the reinforcing structure 3 includes a plurality of longitudinal bones 31 and a plurality of annular ribs 32, the extension directions of the plurality of longitudinal bones 31 are parallel to the axial direction of the inner shell 2, the plurality of longitudinal bones 31 are spaced apart along the circumferential direction of the inner shell 2, the annular ribs 32 include a plurality of ribs, the plurality of ribs are spaced apart along the circumferential direction of the inner shell 2, the two ends of the ribs are respectively fixedly connected to two adjacent longitudinal bones 31, the plurality of annular ribs 32 are spaced apart along the axial direction of the inner shell 2, and the ribs of two adjacent longitudinal bones 31 and two adjacent annular ribs 32 form a receiving groove 6.

[0050] It can be understood that the plurality of accommodating grooves 6 are evenly arranged along the axial direction of the inner shell 2 and along the circumferential direction of the inner shell 2. Each accommodating groove 6 is provided with a local resonance round bag 4. Therefore, the distribution of the local resonance round bag 4 is evenly arranged along the axial direction of the inner shell 2 and along the circumferential direction of the inner shell 2. Therefore, the periodic arrangement of the local resonance round bag 4 in the circumferential direction of the inner shell 2 can achieve band gap vibration reduction.

[0051] In this embodiment, the plurality of longitudinal bones 31 are arranged at equal intervals. The plurality of annular ribs 32 are arranged at equal intervals.

[0052] Optionally, the upper and lower ends of the longitudinal bones 31 are respectively fixedly connected to the outer shell 1 and the inner shell 2, and the upper and lower ends of the ribs are respectively fixedly connected to the outer shell 1 and the inner shell 2. It can be understood that the upper and lower ends of each rib are respectively connected to the inner shell 2 and the outer shell 1, and the left and right ends of each rib are respectively connected to two adjacent longitudinal bones 31.

[0053] Optionally, a rubber layer is fixedly arranged on the outside of the local resonance round bag 4. A pressure-resistant damping layer, i.e., a pressure-resistant rubber layer, is attached to the outside of the local resonance round bag 4. When water enters between the outer shell 1 and the inner shell 2, the pressure of the water will not change the vibration reduction effect of the rubber layer. The damping material can convert mechanical energy into heat energy during vibration, thereby consuming vibration energy. Therefore, a broadband vibration reduction effect can be achieved, and the effect on high-frequency vibration reduction is obvious.

[0054] Optionally, two or more local resonance round bags 4 are arranged in each receiving groove 6. In this embodiment, the two local resonance round bags 4 in each receiving groove 6 are arranged at intervals.

[0055] Optionally, the natural frequencies of the dynamic vibration absorbers 5 in the same accommodating groove group are the same; along the axial direction of the inner shell 2, the natural frequencies of the dynamic vibration absorbers 5 in multiple accommodating groove groups are different.

[0056] A dynamic vibration absorber 5 is arranged inside the local resonance circular bag 4, and dynamic vibration absorbers 5 with different natural frequencies are arranged between different ring ribs. Dynamic vibration absorbers 5 with the same natural frequency are arranged in the same receiving slot group, and dynamic vibration absorbers 5 with different natural frequencies are arranged in different receiving slot groups. In this embodiment, each receiving slot group along the axial direction is sequentially arranged with a natural frequency of f 1 -f 2 、f 2 -f 3 …low-frequency intervals, these frequency intervals can cover the low-frequency intervals of vibration reduction, so as to absorb low-frequency line spectrum vibrations of different frequencies and achieve the purpose of vibration reduction. The dynamic vibration absorber 5 between each receiving groove has only one natural frequency, so it is a vibration reduction of a specific frequency; the natural frequencies of the many receiving grooves between every two ring ribs and the many dynamic vibration absorbers 5 with different natural frequencies in each receiving groove can cover exactly f 0 -f 1 In such a range, arranging the entire axial direction in sequence can achieve low-frequency vibration reduction.

[0057] Optionally, the dynamic vibration absorber 5 is a distributed multi-stage vibration-reducing spring-mass system. The dynamic vibration absorber 5 is composed of a distributed multi-stage vibration-reducing spring-mass system to absorb low-frequency line spectrum vibrations.

[0058] Obviously, the embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A composite acoustic vibration suppression structure with a large diving depth, characterized in that: include: Housing (1); An inner shell (2), wherein the inner shell (2) and the outer shell (1) are coaxially arranged, and a receiving space is provided between the outer shell (1) and the inner shell (2), and water can enter the receiving space through the outer shell (1); a reinforcing structure (3), the reinforcing structure (3) being arranged between the outer shell (1) and the inner shell (2), the reinforcing structure (3) dividing the accommodating space into a plurality of accommodating groove groups, the accommodating groove groups comprising a plurality of accommodating grooves (6), the plurality of accommodating groove groups being arranged in sequence along the axial direction of the inner shell (2), and the plurality of accommodating grooves (6) of the accommodating groove groups being arranged in sequence along the circumferential direction of the inner shell (2); A plurality of local resonance round bags (4), wherein the local resonance round bags (4) are arranged in the containing groove (6), and the interior of the local resonance round bags (4) is a vacuum space; A plurality of dynamic vibration absorbers (5), wherein the plurality of dynamic vibration absorbers (5) are respectively fixedly arranged inside the plurality of local resonance circular bags (4).

2. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: The outer shell (1) is made of a water-permeable material, and the inner shell (2) is made of a high-strength pressure-resistant composite material.

3. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: A pressure-resistant rubber layer is fixedly arranged on the outer side of the local resonance round bag (4).

4. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: Two or more local resonance circular bags (4) are arranged in each of the containing grooves (6).

5. The deep diving composite material acoustic vibration suppression structure according to claim 1 is characterized in that: The natural frequencies of the dynamic vibration absorbers (5) in the same receiving groove group are the same; along the axial direction of the inner shell (2), the natural frequencies of the dynamic vibration absorbers (5) in multiple receiving groove groups are different.

6. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: The dynamic vibration absorber (5) is a distributed multi-stage vibration reduction spring mass system.

7. The deep diving composite material acoustic vibration suppression structure according to claim 1 is characterized in that: The reinforcing structure (3) comprises a plurality of longitudinal bones (31) and a plurality of annular ribs (32), the extension directions of the plurality of longitudinal bones (31) are parallel to the axial direction of the inner shell (2), the plurality of longitudinal bones (31) are arranged at intervals along the circumferential direction of the inner shell (2), the annular ribs (32) comprise a plurality of ribs, the plurality of ribs are arranged along the circumferential direction of the inner shell (2), the two ends of the ribs are respectively fixedly connected to two adjacent longitudinal bones (31), the plurality of annular ribs (32) are arranged at intervals along the axial direction of the inner shell (2), and the ribs of the two adjacent longitudinal bones (31) and the two adjacent annular ribs (32) surround the accommodating groove (6).

8. The deep diving composite material acoustic vibration suppression structure according to claim 7 is characterized in that: The upper and lower ends of the longitudinal bone (31) are respectively fixedly connected to the outer shell (1) and the inner shell (2), and the upper and lower ends of the ribs are respectively fixedly connected to the outer shell (1) and the inner shell (2).

9. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: The reinforcement structure (3) is made of carbon fiber material.

10. The deep diving composite material acoustic vibration suppression structure according to claim 1, characterized in that: Both ends of the housing (1) are closed.

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