A composite acoustic vibration suppression structure with great diving depth

Abstract

The present invention proposes a large-diving-depth composite material acoustic vibration suppression structure, which belongs to the field of ship vibration reduction and noise reduction, and solves the problem that existing ship structures are difficult to effectively suppress vibration and reduce noise in ultra-deepwater environments. The large-diving-depth composite material acoustic vibration suppression structure includes an outer shell, an inner shell, a reinforcement structure, multiple local resonance circular bags, and multiple dynamic vibration absorbers. The inner shell and the outer shell are coaxially arranged, and there is a accommodating space between the outer shell and the inner shell. Water can enter the accommodating space through the outer shell. The reinforcement structure is arranged between the outer shell and the inner shell. The reinforcement structure divides the accommodating space into multiple accommodating slot groups. The accommodating slot group includes multiple accommodating slots. The local resonance circular bag is arranged in the accommodating slot. The interior of the local resonance circular bag is a vacuum space. The dynamic vibration absorber is fixed in the local resonance circular bag. The present invention overcomes the design difficulties of ship structures in ultra-deepwater environments, not only ensuring the pressure resistance requirements under large-diving-depth conditions, but also achieving good vibration suppression and noise reduction effects.

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 of the deep sea. Deep-sea resources are becoming an emerging growth point for global economic development. With the continuous advancement of science and technology, various fields, such as ocean space expansion and marine environmental protection, are booming, and humanity is entering a stage of comprehensive ocean development and utilization. Underwater vehicles, as vehicles for completing underwater missions, are gradually expanding into the deep sea and are required to operate stably and long-term in deep-sea environments. Therefore, their design and operation must address a series of challenges. Vibration and noise reduction technologies are key to ensuring underwater vehicle performance and data accuracy. Frequent mechanical vibration and noise generation during ocean operation can negatively impact the stability and accuracy of underwater vehicles. These vibrations not only affect the stability of the vehicle itself but also interfere with the measurement accuracy of its precision sensors. Composite materials offer advantages over traditional steel materials, such as lightness, high strength, and designability, making their application in submersibles increasingly prominent. However, in ultra-deepwater environments, the acoustic performance of composite structures struggles to match that of conventional structures. To meet operational requirements, acoustic vibration suppression is required in high-pressure environments at depth. 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 large diving depth 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 defined 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, the reinforcing structures being arranged between the outer shell and the inner shell, the reinforcing structures dividing the accommodation space into a plurality of accommodation slot groups, the accommodation slot groups comprising a plurality of accommodation slots, the plurality of accommodation slot groups being arranged in sequence along the axial direction of the inner shell, and the plurality of accommodation slots of the accommodation slot groups being 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 receiving 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 large diving depth composite material acoustic vibration suppression structure, the outer shell is made of water-permeable material, and the inner shell is made of 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 provided in each of the accommodating 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 accommodating groove group are the same; along the axial direction of the inner shell, the natural frequencies of the dynamic vibration absorbers in multiple accommodating 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 large diving depth 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 arranged at intervals along the circumferential direction of the inner shell, the ring ribs include a plurality of ribs, the plurality of ribs are arranged 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 arranged at intervals 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 large diving depth composite material acoustic vibration suppression structure, the upper and lower ends of the longitudinal bone are fixedly connected to the outer shell and the inner shell respectively, and the upper and lower ends of the rib are fixedly connected to the outer shell and the inner shell respectively.

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

[0022] 2. The present invention provides a composite acoustic vibration suppression structure with a high immersion depth. This structure features a closed, vacuum-filled local resonance enclosure, achieving vibration reduction due to the large impedance difference. The outer shell is a cylindrical shell with both ends closed, providing enhanced pressure resistance. The inner shell is constructed of a high-strength, pressure-resistant composite material, while the vacuum-filled local resonance enclosure achieves vibration reduction due to the different impedances.

[0023] 3. The present invention provides a large-depth composite material acoustic vibration suppression structure. In the large-depth composite material acoustic vibration suppression structure, 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 the vibration process, thereby consuming vibration energy. Therefore, a broadband vibration reduction effect can be achieved, and the effect on high-frequency vibration reduction is obvious.

[0024] 4. The present invention provides a large-depth composite acoustic vibration suppression structure. In the large-depth composite acoustic vibration suppression structure, a dynamic vibration absorber is arranged inside the local resonance circle, and dynamic vibration absorbers with different natural frequencies are arranged between different ring ribs. The frequencies are set in sequence along the axial direction as f1-f2, f2-f3...f n -f n+1 The frequency range covers the low-frequency range of vibration reduction. Each dynamic vibration absorber between each accommodating slot has only one natural frequency, so it reduces vibration at a specific frequency. The many accommodating slots between each two ring ribs and the many dynamic vibration absorbers with different natural frequencies in each accommodating slot can cover the natural frequency range of f0-f1. Arranged sequentially throughout the entire axial direction, it can achieve vibration reduction at the entire low frequency range. The periodic arrangement of local resonance circles around the inner shell can achieve band gap vibration reduction. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 2 is a schematic structural diagram of a composite acoustic vibration suppression structure with a large diving depth provided by a specific embodiment of the present invention;

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

[0028] Figure 3 2. It is a side view of a composite acoustic vibration suppression structure with a large diving depth provided by a specific embodiment of the present invention;

[0029] Figure 4 2. It is a structural 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 structural schematic diagram of the shell of a large diving depth composite material acoustic vibration suppression structure provided by a specific embodiment of the present invention.

[0031] In the picture:

[0032] 1. Shell;

[0033] 2. Inner shell;

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

[0035] 4. Local resonance circle;

[0036] 5. Dynamic vibration absorber;

[0037] 6. Receiving tank. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying 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 therein can be combined with each other in the absence of conflict, and the embodiments described 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 expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

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

[0041] In the description of this embodiment, terms such as "upper," "lower," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes 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, which includes 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, and there is a receiving space between the outer shell 1 and the inner shell 2. Water can enter the receiving 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 receiving space into a plurality of receiving groove groups. The receiving groove group includes a plurality of receiving grooves 6. The plurality of receiving groove groups are arranged in sequence along the axial direction of the inner shell 2, and the plurality of receiving grooves 6 of the receiving 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 receiving groove 6, and the interior of the local resonance circular bag 4 is a vacuum space. The plurality of dynamic vibration absorbers 5 are respectively fixedly arranged inside the plurality of local resonance circular bags 4.

[0043] In this large-dive composite acoustic vibration suppression structure, water can enter the containment 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 resisting pressure. The overall aircraft using this large-dive composite acoustic vibration suppression structure can achieve an acoustic vibration suppression effect. 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 sequence. In this process, the local resonance circle 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 used to absorb low-frequency line spectrum vibrations. Due to the various vibration reduction structures such as the local resonance circle 4 and the dynamic vibration absorber 5, vibration suppression effects can be achieved for various frequencies.

[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-deepwater environments, overcomes the design difficulties of ship structures in ultra-deepwater 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 the 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 impermeable 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, with an accommodating space between the outer shell 1 and the inner shell 2.

[0047] In this embodiment, both ends of the housing 1 are closed, forming a complete cylindrical body, which can enhance the pressure resistance.

[0048] Optionally, the inner shell 2 is made of a high-strength, pressure-resistant composite material, and the local resonance circle 4 is a vacuum. The different impedances of the two can achieve 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 ring 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 ring 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 fixedly connected to two adjacent longitudinal bones 31 respectively, the plurality of ring 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 ring ribs 32 form a receiving groove 6.

[0050] It is understood that the multiple accommodating grooves 6 are evenly arranged along the axial direction of the inner shell 2 and along the circumference of the inner shell 2. Each accommodating groove 6 is provided with a localized resonant circular pocket 4. Consequently, the distribution of the localized resonant circular pockets 4 is also evenly arranged along the axial direction of the inner shell 2 and along the circumference of the inner shell 2. The periodic arrangement of the localized resonant circular pockets 4 around the circumference of the inner shell 2 thus achieves bandgap vibration reduction.

[0051] In this embodiment, the longitudinal bones 31 are arranged at equal intervals, and the 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 is 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 provided on the outside of the local resonance circular bag 4. A pressure-resistant damping layer, i.e., a pressure-resistant rubber layer, is attached to the outside of the local resonance circular bag 4. When water enters between the outer shell 1 and the inner shell 2, the water pressure does 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 of high-frequency vibration reduction is obvious.

[0054] Optionally, two or more local resonance round packages 4 are provided in each receiving groove 6. In this embodiment, the two local resonance round packages 4 in each receiving groove 6 are spaced apart.

[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 annular ribs. The same receiving slot group is arranged with dynamic vibration absorbers 5 with the same natural frequency, and different receiving slot groups are arranged with dynamic vibration absorbers 5 with different natural frequencies. In this embodiment, each receiving slot group is sequentially arranged with low-frequency intervals of natural frequencies f1-f2, f2-f3... along the axial direction. These frequency intervals can cover the low-frequency intervals of vibration reduction, thereby absorbing low-frequency line spectrum vibrations of different frequencies and achieving the purpose of vibration reduction. The dynamic vibration absorber 5 between each receiving slot has only one natural frequency, so it is a vibration reduction for a specific frequency; the natural frequencies of the many receiving slots between every two annular ribs and the many dynamic vibration absorbers 5 with different natural frequencies in each receiving slot can cover just such an interval of f0-f1, so the entire low-frequency vibration reduction can be achieved by arranging them in sequence along the entire axial direction.

[0057] Optionally, the dynamic vibration absorber 5 is a distributed multi-stage spring-mass system for vibration reduction. The dynamic vibration absorber 5 is composed of a distributed multi-stage spring-mass system for vibration reduction, and is used 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 contents 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 well understand and utilize the present invention. 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 reinforcement structure (3), the reinforcement structure (3) being arranged between the outer shell (1) and the inner shell (2), the reinforcement structure (3) dividing the accommodation space into a plurality of accommodation slot groups, the accommodation slot groups comprising a plurality of accommodation slots (6), the plurality of accommodation slot groups being arranged in sequence along the axial direction of the inner shell (2), and the plurality of accommodation slots (6) of the accommodation slot 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 accommodating groove (6), and the interior of the local resonance round bags (4) is a vacuum space; and a pressure-resistant rubber layer is fixedly arranged on the outer side of the local resonance round bags (4); A plurality of dynamic vibration absorbers (5) are respectively fixedly arranged inside the plurality of local resonance circular bags (4).

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

4. The deep-diving composite acoustic vibration suppression structure according to claim 1, characterized in that: 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.

5. The deep-diving composite 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.

6. The deep-diving composite acoustic vibration suppression structure according to claim 1, 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 spaced apart along the circumferential direction of the inner shell (2), the annular ribs (32) comprise 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 the two adjacent longitudinal bones (31) and the two adjacent annular ribs (32) enclose the accommodating groove (6).

7. The deep-diving composite acoustic vibration suppression structure according to claim 6, 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 rib are respectively fixedly connected to the outer shell (1) and the inner shell (2).

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

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

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