Marine composite vibration reduction support and design method thereof

Abstract

The invention relates to the technical field of anti-vibration supports, in particular to a marine composite vibration reduction support and a design method thereof.The marine composite vibration reduction support comprises an upper panel, webs, toggle plates and a bottom plate; the upper panel and the bottom plate are arranged in parallel, and each of the upper panel and the bottom plate adopts a multi-layer plate structure with an acoustic black hole structure; two ends of the web plate are respectively connected with the upper panel and the bottom plate; and three sides of the quadrangular toggle plate are respectively connected with the upper panel, the web plate and the bottom plate. The overall strength and stability of the support are remarkably enhanced, vibration energy is effectively absorbed and dispersed, and the vibration reduction efficiency and durability of the support are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of anti-vibration supports, in particular to a marine composite vibration-damping support and a design method thereof. Background Art

[0002] Ships are highly complex mechanical systems. During their navigation operations, core mechanical equipment such as power plants are in continuous operation, which inevitably produces strong vibration and noise. In recent years, with the significant improvement in ship power performance, the vibration and noise problems caused by power machinery have become increasingly serious. This high-intensity vibration and noise not only poses a serious threat to the working environment and living quality of the crew, leading to reduced work efficiency and damage to physical and mental health, but may also accelerate fatigue damage to equipment and interfere with the stable operation of precision instruments. More importantly, in the field of military ships, excessively high vibration and noise levels will significantly weaken their stealth performance, increase the risk of being tracked and detected by the enemy, and thus seriously reduce the battlefield survivability and combat effectiveness of the ship.

[0003] The main source of ship vibration and noise is the vibration of the main equipment. In order to effectively extend the service life of the equipment and reduce the overall vibration and noise level of the ship, it is particularly important to reasonably apply vibration and noise reduction devices. However, due to technical limitations, traditional vibration and noise reduction methods often find it difficult to accurately control the frequency range of action, and the vibration reduction effect is limited.

[0004] In view of this, the industry has conducted extensive and in-depth research on new ship vibration and noise control devices in recent years, including vibration reduction raft devices, air spring vibration isolation devices, sound insulation cover devices, and new devices using advanced materials and technologies. The application of these innovative devices has become a key way to solve the problem of ship vibration and noise. Among them, the vibration reduction and noise reduction device based on the principle of acoustic black hole has attracted widespread attention and discussion in the industry due to its outstanding advantages such as strong targeting, wide frequency response range, and significant vibration reduction and noise reduction effect.

[0005] The acoustic black hole structure is a structure whose edge thickness follows the power law h(x) = εx m A free wedge-shaped structure, such as a plate or beam, whose thickness gradually decreases to zero; where h(x) is the thickness of the acoustic black hole region at x, ε is a constant, and m is a positive rational number and m≥2. When a vertically incident bending wave propagates toward the edge of the wedge-shaped structure in the direction of gradually decreasing thickness, its cumulative phase tends to infinity near the edge of the structure, causing the bending wave to be unable to continue to propagate to the edge, thereby avoiding wave reflection. This mechanism causes the bending wave energy to be effectively concentrated in the tip edge region of the wedge-shaped structure, forming the so-called "acoustic black hole" effect. Furthermore, by rotating this one-dimensional acoustic black hole concept around the edge of the wedge-shaped structure, a two-dimensional acoustic black hole structure can be constructed. This type of structure can efficiently focus the bending wave energy at its center point, significantly suppress the vibration of other parts of the structure, and show great potential in vibration and noise reduction.

[0006] However, in the actual manufacturing process, it is extremely challenging to achieve a strictly power-law variation in the thickness of the acoustic black hole structure until the theoretically zero thickness. Especially near the tip edge, it is often difficult to avoid the problem of thickness truncation. Research shows that even a tiny local truncation will cause a significant increase in the structure's reflection coefficient, thus severely weakening the expected effect of the acoustic black hole effect.

[0007] To address this challenge, researchers have explored various strategies. Among them, attaching damping materials to the acoustic black hole region has proven to be an effective method to reduce the reflection coefficient. In addition, using a thinner design for the uniform region thickness of the acoustic black hole can not only make full use of the acoustic black hole principle but also alleviate the manufacturing difficulty to a certain extent, thereby improving the overall performance of the acoustic black hole structure in vibration and noise reduction. These improvement measures provide a more feasible path for the practical application of the acoustic black hole structure. Summary of the Invention

[0008] The object of the present invention is to provide a marine composite vibration damping bracket and its design method to solve at least one of the above technical problems.

[0009] The present invention achieves the above object through the following technical solutions:

[0010] A marine composite vibration damping bracket, comprising: an upper panel, a web, a gusset plate, and a bottom plate;

[0011] The upper panel and the bottom plate are arranged in parallel, and both the upper panel and the bottom plate adopt a multi-layer board structure with an acoustic black hole structure;

[0012] Both ends of the web are respectively connected to the upper panel and the bottom plate; three sides of the quadrilateral gusset plate are respectively connected to the upper panel, the web, and the bottom plate.

[0013] Furthermore, a one-dimensional acoustic black hole array structure is provided on the upper panel and the bottom plate, and the acoustic black hole region is filled with damping materials;

[0014] and / or,

[0015] The web adopts a rectangular plate provided with a two-dimensional acoustic black hole array structure;

[0016] and / or,

[0017] The gusset plate adopts a rectangular plate provided with a one-dimensional acoustic black hole, and the edge of the one-dimensional acoustic black hole structure on the gusset plate is truncated and damping materials are laid at the edge.

[0018] Furthermore, the array form of the acoustic black holes on the web is a rectangular array;

[0019] Multiple acoustic black holes are provided on each gusset plate.

[0020] Further, the upper panel and the bottom panel are a multi-layer structure with the same thickness for each layer. Three layers form a group. The first layer is a rubber material layer, and the latter two layers are provided with one-dimensional acoustic black holes that are symmetric to each other at the same position.

[0021] and / or

[0022] Both the web plate and the gusset plate adopt a multi-layer board structure with an acoustic black hole structure.

[0023] Further, the thin plates of each layer in the multi-layer board structure are connected into one body by rivets.

[0024] Further, the processing method of the acoustic black hole structure in the multi-layer board structure is 3D printing, and it is installed in the through holes on the thin plate by welding.

[0025] Further, vibration damping mass blocks are arranged on both the web plate and the gusset plate.

[0026] Further, the vibration damping mass block is a hollow vibration damping structure; irregularly shaped and different-sized metal particle dampers are filled inside the hollow vibration damping structure.

[0027] Further, when the length of the hollow vibration damping structure exceeds a preset length, a partition is arranged inside the hollow vibration damping structure.

[0028] A design method for a marine composite vibration damping support, which is used to manufacture the marine composite vibration damping support as described in any one of the above, the method includes the following steps:

[0029] Basic structure design: Initially design the parameters of the ordinary support structure according to the installation requirements of the support to ensure that it can meet the basic strength requirements under the working state;

[0030] Acoustic black hole design for the upper panel and the bottom panel: Divide the thickness of the upper panel and the bottom panel, and design the acoustic black hole structure according to the thickness, size, and selected material of the thin plate.

[0031] Acoustic black hole design for the web plate and the gusset plate: Divide the thickness of the web plate and the gusset plate, and design the acoustic black hole structure according to the thickness, size, and selected material of the thin plate.

[0032] Vibration damping mass block position planning: Plan the installation positions of the vibration damping mass blocks at appropriate positions of the support structure; among them, vibration damping mass blocks are arranged on both the web plate and the gusset plate.

[0033] Internal structure optimization of the vibration damping mass block: When the length of the hollow vibration damping structure forming the vibration damping mass block exceeds the preset length, a partition is arranged at intervals inside the hollow vibration damping structure.

[0034] The beneficial effects of the present invention are as follows:

[0035] The present invention integrates principles such as acoustic black holes, locally resonant phononic crystals, impedance mismatch, and particle damping vibration reduction, achieving efficient aggregation and absorption of vibration energy. By designing the acoustic black hole structures in the upper panel, bottom panel, web, and gusset plate, and innovating the traditional thick plate into a multi-layer thin plate form, not only is the acoustic black hole effect significantly enhanced, but also more diverse choices of acoustic black hole sizes and array layouts are provided, greatly weakening the vibration energy transmission path and effectively improving the vibration reduction performance.

[0036] The present invention is provided with vibration damping mass blocks on the web and gusset plate, further enhancing the vibration isolation effect by utilizing the impedance mismatch principle. In particular, for the case where the length of the hollow vibration damping structure is relatively long, an optimized solution of arranging partition plates inside is proposed to ensure that the vibration damping mass blocks can maintain their excellent vibration reduction performance during long-term use.

[0037] On the premise of not affecting the structural strength, the present invention realizes efficient absorption and dissipation of vibration energy, successfully overcomes the problem of poor vibration reduction effect caused by the plate thickness of traditional acoustic black hole vibration reduction brackets, and provides a new and efficient solution for the design of marine composite vibration reduction brackets. Brief Description of the Drawings

[0038] Figure 1 Schematic diagram of the overall structure of a marine composite vibration reduction bracket according to an embodiment of the present invention Figure 1 ;

[0039] Figure 2 Schematic diagram of the overall structure of a marine composite vibration reduction bracket according to an embodiment of the present invention Figure 2 ;

[0040] Figure 3 Schematic diagram of the overall structure of a marine composite vibration reduction bracket according to an embodiment of the present invention Figure 3 ;

[0041] Figure 4 Front view of the upper panel of a marine composite vibration reduction bracket according to an embodiment of the present invention;

[0042] Figure 5 Side view of the upper panel according to an embodiment of the present invention;

[0043] Figure 6 Partial enlarged view of the upper panel according to an embodiment of the present invention;

[0044] Figure 7 Schematic diagram of the web according to an embodiment of the present invention;

[0045] Figure 8Front view of the gusset plate according to an embodiment of the present invention;

[0046] Figure 9 Schematic diagram of the gusset plate embedding according to an embodiment of the present invention;

[0047] Figure 10 Cross-sectional view of the gusset plate according to an embodiment of the present invention;

[0048] Figure 11 Front view of the hollow vibration damping structure according to an embodiment of the present invention;

[0049] Figure 12 Top view of the hollow vibration damping structure according to an embodiment of the present invention;

[0050] Figure 13 Left view of the hollow vibration damping structure according to an embodiment of the present invention;

[0051] Figure 14 Flow chart of the design method of the marine composite vibration damping support according to an embodiment of the present invention. Detailed implementation manners

[0052] Now, the content of the present invention will be described with reference to exemplary embodiments. It should be understood that the described embodiments are only for enabling those of ordinary skill in the art to better understand and thus implement the content of the present invention, rather than implying any limitation on the scope of the present invention.

[0053] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment".

[0054] Embodiment 1

[0055] Figure 1 Schematic diagram of the overall structure of the marine composite vibration damping support according to an embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the overall structure of the marine composite vibration damping support according to an embodiment of the present invention Figure 2 ; Figure 3 Schematic diagram of the overall structure of the marine composite vibration damping support according to an embodiment of the present invention Figure 3 . As Figures 1-3 shown, according to an embodiment of the present invention, a marine composite vibration damping support includes: upper panel 1, web 2, gusset plate 4, bottom plate 5;

[0056] The upper panel 1 and the bottom plate 5 are arranged in parallel, and both the upper panel 1 and the bottom plate 5 adopt a multi-layer board structure with an acoustic black hole structure;

[0057] Both ends of the web 2 are respectively connected to the upper panel 1 and the bottom panel 5; three sides of the quadrilateral gusset plate 4 are respectively connected to the upper panel 1, the web 2, and the bottom panel 5.

[0058] Preferably, the upper panel 1, the web 2, the gusset plate 4, and the bottom panel 5 are connected by welding.

[0059] In this embodiment, a marine composite vibration damping bracket is proposed. This bracket shows significant vibration damping efficiency in both structural design and material application. It mainly includes an upper panel 1, a web 2, a gusset plate 4, and a bottom panel 5. In terms of structural layout, the upper panel 1 and the bottom panel 5 are designed to be parallel. They not only serve as the upper and lower support surfaces of the bracket but also incorporate the design concept of multi-layer plates with acoustic black hole structures. This multi-layer plate structure not only enhances the overall strength of the structure but, more importantly, reduces the thickness of the single-layer acoustic black hole thin plate to a certain extent, improves the acoustic black hole effect, and thus significantly enhances the vibration damping effect. The web 2, as a vertical support component connecting the upper panel 1 and the bottom panel 5, has its two ends firmly welded to the upper panel and the bottom panel respectively, ensuring the vertical stability of the bracket. The quadrilateral gusset plate 4 has three sides welded to the upper panel 1, the web 2, and the bottom panel 5 respectively, forming a stable support structure, further enhancing the overall rigidity and stability of the bracket.

[0060] The connection method between the upper panel 1, the web 2, the gusset plate 4, and the bottom panel 5 adopts welding technology. Welding not only ensures the tight connection between each component but also greatly improves the overall strength and durability of the bracket. At the same time, the welded connection can effectively prevent the generation of additional stress concentration at the component connection points due to vibration, thereby further enhancing the vibration damping performance of the bracket.

[0061] The present invention significantly enhances the overall strength and stability of the bracket, effectively absorbs and disperses vibration energy, prevents the generation of additional stress concentration at the component connection points due to vibration, and greatly improves the vibration damping efficiency and durability of the bracket.

[0062] Figure 4 It is the front view of the upper panel according to an embodiment of the present invention. Figure 5 It is the side view of the upper panel according to an embodiment of the present invention. Figure 6 It is the partial enlarged view of the upper panel according to an embodiment of the present invention. As Figures 4-6 shown, according to an embodiment of the present invention, a one-dimensional acoustic black hole array structure is provided on the upper panel 1 and the bottom panel 5, and the acoustic black hole area is filled with damping material.

[0063] and / or

[0064] Figure 7 It is the schematic diagram of the web according to an embodiment of the present invention. As Figure 7 shown, the web 2 is a rectangular plate provided with a two-dimensional acoustic black hole array structure.

[0065] and / or,

[0066] Figure 8 is the front view of the gusset plate of an embodiment of the present invention, Figure 9 is the schematic diagram of the gusset plate embedding of an embodiment of the present invention, Figure 10 is the sectional view of the gusset plate of an embodiment of the present invention. As Figures 8-10 shown, the gusset plate 4 is a rectangular plate provided with a one-dimensional acoustic black hole, and the edge of the one-dimensional acoustic black hole structure on the gusset plate 4 is truncated and a damping material is laid at the edge.

[0067] Preferably, the array form of the acoustic black holes on the web 2 is a rectangular array;

[0068] Each gusset plate 4 is provided with a plurality of acoustic black holes.

[0069] In this embodiment, the design of the marine composite vibration damping support is further optimized. Specifically, a one-dimensional acoustic black hole array structure is provided on the upper panel 1 and the bottom panel 5, and a damping material is filled to absorb vibration energy; the web 2 adopts a rectangular plate design with a two-dimensional acoustic black hole array structure, which can more effectively capture and guide vibration waves into the acoustic black hole area to achieve efficient energy dissipation; at the same time, the gusset plate 4 also adopts a rectangular plate design with a one-dimensional acoustic black hole, and the edge of the acoustic black hole structure is truncated and a damping material is laid, which not only ensures the strength of the gusset plate 4 but also further enhances the vibration damping effect. In particular, the acoustic black holes on the web 2 are arranged in a rectangular array form, and each gusset plate 4 is cleverly provided with a plurality of acoustic black holes to maximize the vibration damping efficiency. In this embodiment, the web 2 is rectangular in shape, and each gusset plate 4 is specifically provided with four acoustic black holes, which achieves excellent vibration damping performance while ensuring the structural strength.

[0070] The marine composite vibration damping support of the present invention effectively improves the vibration damping efficiency of the support by providing a one-dimensional acoustic black hole array on the upper panel and the bottom panel and filling with a damping material, the web adopting a rectangular plate design with a two-dimensional acoustic black hole array, and the gusset plate adopting a rectangular plate design with a one-dimensional acoustic black hole edge truncated and a damping material laid. In particular, the rectangular array and multi-black hole configuration of the acoustic black holes on the web and the gusset plate achieve efficient dissipation of vibration energy while ensuring the structural strength, thus significantly enhancing the overall vibration damping performance.

[0071] According to an embodiment of the present invention, the upper panel 1 and the bottom panel 5 are multi-layer structures with the same thickness for each layer. Three layers form a group. The first layer is a rubber material layer, and the latter two layers are provided with symmetric one-dimensional acoustic black holes at the same positions;

[0072] and / or,

[0073] Both the web 2 and the gusset plate 4 adopt a multi-layer board structure with an acoustic black hole structure.

[0074] Preferably, the thin plates of each layer in the multi-layer board structure are connected into one body by rivets.

[0075] Preferably, the processing method of the acoustic black hole structure in the multi-layer board structure is 3D printing, and it is installed in the through holes on the thin plate by welding.

[0076] In this embodiment, the upper panel 1 and the bottom plate 5 of the marine composite vibration damping bracket are multi-layer structures, each group contains three layers and the thickness of each layer is the same. The first layer is made of a rubber material layer to provide the basic vibration damping effect; the latter two layers are provided with symmetrical one-dimensional acoustic black holes at the same position, and these acoustic black holes can efficiently capture and guide vibration waves to achieve concentrated dissipation of energy. In addition, both the web 2 and the gusset plate 4 also adopt a multi-layer board structure and also incorporate the acoustic black hole design, further enhancing the overall vibration damping performance. In the multi-layer board structure, the thin plates of each layer are firmly connected into one body by rivets, ensuring the stability and durability of the structure. In particular, in this embodiment, the processing method of the acoustic black hole structure adopts advanced 3D printing technology, and then is precisely installed in the through holes on the thin plate by welding. This high-precision manufacturing process not only ensures the precise positioning of the acoustic black hole, but also greatly improves the vibration damping efficiency and structural strength of the bracket.

[0077] The marine composite vibration damping bracket of the present invention adopts a multi-layer structure design, incorporates a rubber layer and one-dimensional acoustic black holes in the upper panel and the bottom plate, the web and the gusset plate adopt a multi-layer board combined with an acoustic black hole design, uses rivet connection to enhance the structural stability, and at the same time uses 3D printing technology to precisely manufacture the acoustic black hole and install it by welding, realizing the dual improvement of the efficient dissipation of vibration energy and the structural strength, and significantly enhancing the vibration damping performance of the bracket.

[0078] Figure 11 It is the front view of the hollow vibration damping structure of an embodiment of the present invention. Figure 12 It is the top view of the hollow vibration damping structure of an embodiment of the present invention. Figure 13 It is the left view of the hollow vibration damping structure of an embodiment of the present invention. As Figures 11-13 shown, according to an embodiment of the present invention, vibration damping mass blocks are provided on both the web 2 and the gusset plate 4.

[0079] Preferably, the vibration damping mass block is a hollow vibration damping structure 3; the hollow vibration damping structure 3 is filled with metal particle damping with irregular shapes and different sizes.

[0080] Preferably, when the length of the hollow vibration damping structure 3 exceeds a preset length, a partition is provided inside the hollow vibration damping structure 3.

[0081] In this embodiment, vibration damping mass blocks are provided on the web 2 and the gusset plate 4 of the marine composite vibration damping bracket to enhance the vibration damping effect of the bracket. These vibration damping mass blocks are in the form of a hollow vibration damping structure 3, and the inside of the hollow vibration damping structure 3 is filled with metal particle damping with irregular shapes and different sizes. This design can more effectively absorb and dissipate vibration energy. In particular, when the length of the hollow vibration damping structure 3 exceeds a preset value, in order to avoid excessive accumulation and adverse effects of the internal metal particles, a partition is provided at intervals inside the hollow vibration damping structure 3 to separate and support the metal particles and ensure their uniform distribution, thereby further improving the vibration damping effect. Through this design, the vibration damping performance of the web 2 and the gusset plate 4 is significantly enhanced, making an important contribution to the improvement of the overall performance of the marine composite vibration damping bracket.

[0082] The marine composite vibration damping bracket of the present invention effectively improves the vibration damping performance of the bracket, significantly enhances the vibration energy absorption and dissipation capacity of the overall structure, by providing a hollow vibration damping structure on the web and the gusset plate, filling irregular metal particle damping inside, and adding partitions to optimize the particle distribution when the length exceeds the preset length.

[0083] Embodiment 2

[0084] As Figures 1-13 shown, according to an embodiment of the present invention, a marine composite vibration damping bracket includes an upper panel 1, a bottom plate 5, a web 2, and a gusset plate 4. Among them, the upper panel 1, the bottom plate 5, the web 2, and the gusset plate 4 are all rectangular and are all composed of multiple thin plate structures stacked together. Each plate is provided with an acoustic black hole structure. Among them, vibration damping mass blocks are also attached to the web 2 and the gusset plate 4. A damping material is attached to the acoustic black hole area to absorb the vibration energy accumulated by the acoustic black hole effect.

[0085] Preferably, the installation method between the plates of the bracket is welding.

[0086] In this embodiment, a marine composite vibration damping bracket is proposed. The bracket includes an upper panel 1, a bottom panel 5, a web 2, and gusset plates 4, all of which are designed in a rectangular shape. The rectangular shape design not only ensures the overall stability of the bracket but also facilitates installation and adaptation to various ship structures. The components are connected by welding, strengthening the stability of the overall bracket. The upper panel 1 and the bottom panel 5, as the upper and lower support surfaces of the bracket, are both composed of multiple thin plate structures stacked together. This design not only enhances the strength and rigidity of the panels but also effectively disperses the vibration energy through the interaction of the multiple layers, reducing vibration transmission. At the same time, acoustic black hole structures are embedded inside both of these two panels, using the acoustic black hole effect to guide and concentrate the vibration energy, thereby achieving the purpose of vibration damping and noise reduction. The web 2, as the vertical support structure of the bracket, also adopts a design of multiple thin plate structures stacked together. Different from the upper panel 1 and the bottom panel 5, vibration damping mass blocks are additionally attached to the web 2. These vibration damping mass blocks further enhance the vibration damping performance of the web 2 by increasing the local mass. At the same time, the combination of the acoustic black hole structure and the damping material inside the web 2 enables the web 2 to more effectively absorb and consume the vibration energy when subjected to vibration. The gusset plates 4, as the strengthening structure connecting the web 2, the upper panel 1, and the bottom panel 5, also adopt a design of multiple thin plate structures stacked together and are attached with vibration damping mass blocks. The design of the gusset plates 4 not only enhances the overall stability of the bracket but also further improves the vibration damping performance of the bracket through the combined action of the acoustic black hole structure and the damping material. In order to fully absorb the vibration energy accumulated by the acoustic black hole effect, damping materials are specially laid in the acoustic black hole area. These damping materials have excellent vibration absorption performance and can effectively absorb and consume the vibration energy concentrated by the acoustic black hole effect, thus ensuring that the overall bracket has excellent vibration damping and noise reduction effects.

[0087] The marine composite vibration damping bracket proposed by the present invention realizes the effective guidance, concentration, and absorption of vibration energy through the combined application of a carefully designed multi-layer thin plate structure, acoustic black hole structure, vibration damping mass blocks, and damping materials, providing solid technical support for the smooth operation and noise reduction of ships.

[0088] According to an embodiment of the present invention, the upper panel 1, the bottom panel 5, the web 2, and the gusset plates 4 are all multi-layer structures, each layer having the same thickness. Three layers form a group. The first layer is a rubber material layer, and the last two layers are provided with one-dimensional acoustic black holes that are symmetric to each other at the same position.

[0089] Preferably, the upper panel 1, the bottom panel 5, the web 2, and the gusset plates 4 are composite structures composed of multiple thin plates, and the thin plates are connected into one body by rivets.

[0090] In this embodiment, the upper panel 1, the bottom panel 5, the web 2, and the gusset plate 4 all adopt a multi-layer structure design. Each layer has the same thickness, and three layers form a group. The first layer of a group of structural units is made of a rubber material layer, which has good elasticity and vibration absorption performance and can effectively absorb and disperse vibration energy. The latter two layers are provided with one-dimensional acoustic black hole structures that are symmetric with each other at the same position. This structure can guide the vibration energy to concentrate in a specific direction and absorb and consume it through the acoustic black hole effect. The combination of this multi-layer structure and the acoustic black hole structure enables the bracket to more effectively absorb and disperse energy when bearing vibration, thereby significantly reducing vibration transmission and noise generation.

[0091] By adopting the combined design of the above multi-layer structure and the acoustic black hole structure, the present invention demonstrates excellent vibration and noise reduction performance. The introduction of the rubber material layer enhances the elasticity and vibration absorption ability of the bracket, while the one-dimensional acoustic black hole structure can efficiently guide and absorb vibration energy, thereby greatly reducing vibration transmission and noise radiation.

[0092] According to an embodiment of the present invention, each rectangular gusset plate 4 is provided with a group of four one-dimensional acoustic black holes.

[0093] Preferably, the edge of the one-dimensional acoustic black hole structure on the gusset plate 4 is truncated, and a damping material is laid at the edge.

[0094] In this embodiment, a plurality of gusset plates 4 are connected between the upper panel 1 and the bottom panel 5, and the gusset plates 4 are vertically connected to the upper panel 1 and the bottom panel 5; on the rectangular gusset plate 4, each layer is provided with a group of four one-dimensional acoustic black holes.

[0095] The rectangular gusset plates 4 are arranged between the upper panel 1 and the bottom panel 5 to form a stable connection. These gusset plates 4 not only play a role in structural support but also incorporate advanced acoustic design concepts. Specifically, each rectangular gusset plate 4 is carefully provided with a group of four one-dimensional acoustic black holes, which are evenly distributed along a certain dimension of the gusset plate 4 and are designed to absorb and dissipate vibration energy, thereby significantly enhancing the overall vibration reduction effect. To further optimize the acoustic performance, the edge of the acoustic black hole structure on the gusset plate 4 is truncated, and a damping material is laid at the edge. This design further enhances the vibration energy absorption ability, reduces the energy reflection and transmission, and thus significantly improves the overall vibration reduction effect.

[0096] The gusset plate of the present invention not only enhances the structural stability but also achieves excellent acoustic performance, greatly enhancing the vibration energy absorption and dissipation ability, thereby significantly reducing vibration transmission and noise pollution.

[0097] According to an embodiment of the present invention, the array form of the acoustic black holes on the web 2 is a rectangular array.

[0098] In this embodiment, the acoustic black holes on the web 2 adopt a rectangular array arrangement. This design enables the acoustic black holes to be evenly distributed on the web 2, and each acoustic black hole can effectively guide and absorb vibration energy, thereby further enhancing the overall vibration absorption and noise reduction performance of the web 2. The rectangular array arrangement not only ensures the high efficiency of energy absorption but also optimizes the structural stability and reliability.

[0099] By adopting the acoustic black hole design of rectangular array for the web of the present invention, the vibration control and noise suppression capabilities are significantly improved.

[0100] According to an embodiment of the present invention, the vibration damping mass block is a hollow vibration damping structure 3, and the inside is filled with metal particle damping with irregular shapes and different sizes.

[0101] Preferably, the filling amount of the filling particles in the hollow vibration damping structure 3 is 2 / 3 to 3 / 4 of the volume.

[0102] In this embodiment, the vibration damping mass block adopts a hollow vibration damping structure 3, and the inside of the hollow vibration damping structure 3 is filled with metal particles with irregular shapes and different sizes as damping materials. This design not only makes full use of the light weight and high strength characteristics of the hollow shell structure but also effectively increases the damping performance of the vibration damping mass block through the internally filled metal particles. Preferably, the filling amount of the metal particles is controlled between 2 / 3 and 3 / 4 of the volume of the vibration damping hollow shell structure. This ratio not only ensures sufficient damping effect but also avoids problems such as excessive structural rigidity and reduced vibration transmission efficiency caused by overfilling. The vibration damping mass block can effectively absorb and dissipate energy on the vibration transmission path, thereby significantly improving the vibration isolation and noise control performance of the overall structure.

[0103] The vibration damping mass block of the present invention adopts the combination of a hollow vibration damping structure and irregular-shaped metal particle damping, and significantly improves the vibration suppression and noise control capabilities of the vibration damping mass block by optimizing the filling ratio.

[0104] According to an embodiment of the present invention, the processing method of the acoustic black hole structure is 3D printing, and it is installed in the through holes on the thin plate by welding.

[0105] In this embodiment, the acoustic black hole structure is processed by advanced 3D printing technology. This processing method can precisely manufacture acoustic black holes with complex geometric shapes and fine structures. Subsequently, by welding, the precisely manufactured acoustic black hole structure is firmly installed in the predetermined through holes on the thin plate to ensure the structural stability and reliability.

[0106] The present invention uses 3D printing and welding technologies to achieve high-precision and high-stability installation of the acoustic black hole structure on the thin plate, providing strong support for the optimization of acoustic performance.

[0107] Embodiment 3

[0108] Figure 14 This is a flowchart of the design method for a marine composite vibration damping bracket according to an embodiment of the present invention. As Figure 14 shown, according to an embodiment of the present invention, a design method for a marine composite vibration damping bracket for manufacturing any marine composite vibration damping bracket of the present invention includes the following steps:

[0109] Step S102, basic structure design: Initially design the parameters of the ordinary bracket structure according to the installation requirements of the bracket to ensure that it can meet the basic strength requirements under the working conditions;

[0110] Among them, the installation requirements include: installation location, working environment, and load-bearing requirements;

[0111] Step S104, acoustic black hole design for the upper panel 1 and the bottom panel 5: Divide the thickness of the upper panel 1 and the bottom panel 5, and design the acoustic black hole structure according to the thickness, size, and selected material of the thin plate;

[0112] Among them, the thickness division of the upper panel 1 and the bottom panel 5 can be equal division or unequal division;

[0113] Step S106, acoustic black hole design for the web 2 and the gusset 4: Divide the thickness of the web 2 and the gusset 4, and design the acoustic black hole structure according to the thickness, size, and selected material of the thin plate;

[0114] The thickness division of the web 2 and the gusset 4 can be equal division or unequal division;

[0115] Among them, the web 2 can be designed as a rectangular plate with a two-dimensional acoustic black hole array structure, while the gusset 4 can adopt a one-dimensional acoustic black hole structure. Similarly, the parameters of these structures need to be customized according to the physical characteristics and expected performance of the thin plate.

[0116] Step S108, planning the position of the vibration damping mass block: Plan the installation position of the hollow vibration damping mass block at an appropriate position of the bracket structure; among them, vibration damping mass blocks are arranged on both the web 2 and the gusset 4;

[0117] These vibration damping mass blocks adopt the hollow vibration damping structure 3, aiming to further enhance the vibration damping effect of the bracket through the damping of irregular and different-sized metal particles filled inside the hollow vibration damping structure 3;

[0118] Step S110, when the length of the hollow vibration damping structure 3 constituting the vibration damping mass block exceeds the preset length, a partition is arranged at intervals inside the hollow vibration damping structure 3.

[0119] When the length of the vibration damping mass block is relatively long, in order to prevent the accumulation of internal metal particles, a partition plate needs to be provided at intervals inside the hollow vibration damping structure 3. This step ensures that the vibration damping mass block can maintain the stability and effectiveness of its vibration damping performance during long-term use.

[0120] The design method of the marine composite vibration damping bracket of the present invention ensures that while meeting the basic strength requirements, the vibration damping and noise reduction performance of the bracket is significantly improved through precise basic structure design, innovative acoustic black hole design, reasonable position planning of the vibration damping mass block and internal structure optimization, and is particularly suitable for the complex and changeable working environment of ships.

[0121] Embodiment 4

[0122] According to an embodiment of the present invention, a design method of a marine composite vibration damping bracket includes the following steps:

[0123] Step S1: Design the parameters of the ordinary bracket structure (a through hole is provided at the position of the acoustic black hole, and a comparison drawing is drawn) according to the installation requirements of the bracket to meet the strength requirements during work.

[0124] In the process of designing the bracket parameters, in addition to considering the strength requirements of the bracket, the vibration transfer characteristic analysis should also be referred to to ensure that the bracket structure can effectively reduce the transfer of vibration energy on the basis of meeting the strength. When designing the ordinary bracket structure, the position and shape of the acoustic black hole are initially planned to ensure that the through hole design not only meets the requirements of the acoustic black hole effect but also avoids adverse effects on the structural strength.

[0125] Step S2: Divide the thickness of the upper panel 1 and the bottom panel 5 equally or unequally, and design the acoustic black hole according to the parameters of the thickness, size, and material of the thin plate.

[0126] When selecting the materials for the upper panel 1 and the bottom panel 5, consider the damping characteristics and lightweight and high-strength characteristics of the materials to further improve the vibration damping performance and reduce the weight. Use tools such as finite element analysis (FEA) to accurately design the acoustic black hole for the unequal-thickness upper panel and bottom panel to ensure that the vibration energy can be effectively absorbed at the preset frequency.

[0127] Step S3: Divide the thickness of the web 2 equally or unequally, and design the acoustic black hole according to the parameters of the thickness, size, and material of the equally divided thin plate.

[0128] For the web 2, a multi-layer structure can be considered, and each layer uses different thicknesses and materials to form a gradient-varying acoustic black hole effect to further improve the vibration damping efficiency. In the design of the acoustic black hole of the web 2, dynamic response analysis is added to ensure the stability and effectiveness of the design under different working conditions.

[0129] Step S4: Determine the installation positions of the vibration damping masses on the web 2 and the gusset plate 4 according to the positions of the acoustic black holes. In principle, to reduce the mass of the bracket, no vibration damping mass blocks are installed in the acoustic black hole areas.

[0130] When determining the installation positions of the vibration damping masses, in addition to avoiding the acoustic black hole areas, methods such as topology optimization should also be used to find the optimal distribution of the vibration damping masses to maximize the vibration damping effect. Consider using lightweight and high-strength materials or hollow structure designs for the vibration damping mass blocks to further reduce the overall mass of the bracket.

[0131] Step S5: When the length of the vibration damping mass block is relatively long, install a partition inside the shell at intervals to prevent internal particle accumulation.

[0132] The design of the partition should consider its stiffness and damping characteristics to ensure that it can effectively prevent internal particle accumulation without affecting the vibration damping effect of the acoustic black hole. Consider using materials with sound absorption or damping characteristics to make the partition. For long vibration damping mass blocks, in addition to installing partitions, the internal flow channel design can also be optimized to ensure smooth air or liquid flow and avoid generating additional vibration sources.

[0133] In this embodiment, the designed marine composite vibration damping bracket includes: a one-dimensional acoustic black hole upper panel 1, a two-dimensional acoustic black hole web 2, a hollow vibration damping structure 3, a one-dimensional acoustic black hole gusset plate 4, and a one-dimensional acoustic black hole bottom plate 5. Both the one-dimensional acoustic black hole upper panel 1 and the bottom plate 5 are set as rectangular plate structures, and both the upper panel 1 and the bottom plate 5 are respectively composed of multiple layers of equal-thickness thin plates. Three thin plates form a group. The first layer of each group is a rubber damping layer, and the second and third layers are symmetric one-dimensional grooved acoustic black hole plate structures, and the acoustic black hole areas are filled with damping materials. The two-dimensional acoustic black hole web 2 is a rectangular multi-layer plate structure, and there are two rows of two-dimensional circular acoustic black holes arranged in a rectangular array on the plate, and the acoustic black hole areas are filled with damping materials. The one-dimensional acoustic black hole gusset plate 4 is a rectangular multi-layer plate structure, and there are two rows of one-dimensional wedge-shaped acoustic black holes arranged on the plate. The edges of the acoustic black holes are truncated, the truncated ends are free, and damping materials are pasted at the truncated places. The hollow vibration damping structure 3 is welded to the lower surface of the upper panel 1 and the sides of the web 2 and the gusset plate 4, and is a multi-segment hollow structure, and the inside is filled with high-density particles with different sizes and irregular shapes for damping.

[0134] The design method of the marine composite vibration damping bracket of the present invention effectively improves the vibration damping performance and structural efficiency of the bracket by combining one-dimensional and two-dimensional acoustic black hole structures, lightweight and high-strength materials, and hollow vibration damping structures, and optimizing the distribution of the vibration damping masses and the internal flow channels. At the same time, it reduces the overall mass, avoids the problem of internal particle accumulation, and realizes efficient and lightweight vibration control.

[0135] The present invention utilizes principles such as acoustic black holes, locally resonant phononic crystals, impedance mismatch, and particle damping vibration reduction to concentrate energy at the central position of the acoustic black hole structure, and the damping material absorbs and dissipates the vibration energy. The vibration isolation is carried out by the vibration damping mass block using the impedance mismatch principle.

[0136] In the present invention, the thick plate of the traditional vibration damping bracket is designed in the form of several thin plates, making the acoustic black hole effect more obvious and efficient in the bracket structure, and enabling more choices for the size and array form of the acoustic black hole structure, greatly reducing the transmission of vibration energy. The present invention can overcome the problem of poor vibration damping effect due to the relatively thick plate thickness in the traditional acoustic black hole vibration damping bracket, and achieve the effect of efficient vibration damping without affecting the structural strength.

[0137] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

[0138] It should be understood that the magnitude of the sequence numbers of the steps in the invention content and embodiments of the present invention does not absolutely mean the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Claims

1. A composite vibration-damping bracket for a ship, characterized in that: include: Upper panel (1), web plate (2), bracket plate (4), bottom plate (5); The upper panel (1) and the bottom panel (5) are arranged in parallel, and both the upper panel (1) and the bottom panel (5) adopt a multi-layer plate structure with an acoustic black hole structure; The two ends of the web (2) are respectively connected to the upper panel (1) and the bottom plate (5); three sides of the quadrilateral bracket (4) are respectively connected to the upper panel (1), the web (2) and the bottom plate (5).

2. The marine composite vibration-damping bracket according to claim 1, characterized in that: A one-dimensional acoustic black hole array structure is provided on the upper panel (1) and the bottom panel (5), and the acoustic black hole region is filled with a damping material; and / or, The web (2) is a rectangular plate provided with a two-dimensional acoustic black hole array structure; and / or, The toggle plate (4) is a rectangular plate provided with a one-dimensional acoustic black hole, and the edge of the one-dimensional acoustic black hole structure on the toggle plate (4) is truncated and a damping material is laid at the edge.

3. The composite vibration-damping bracket for ships according to claim 2, characterized in that: The array form of the acoustic black holes on the web (2) is a rectangular array; Each toggle plate (4) is provided with a plurality of acoustic black holes.

4. The composite vibration-damping bracket for ships according to claim 1, characterized in that: The upper panel (1) and the bottom panel (5) are multi-layer structures with each layer having the same thickness, and three layers form a group, the first layer is a rubber material layer, and the latter two layers are provided with mutually symmetrical one-dimensional acoustic black holes at the same position; and / or, The web plate (2) and the toggle plate (4) both adopt a multi-layer plate structure with an acoustic black hole structure.

5. The composite vibration-damping bracket for ships according to claim 4, characterized in that: The thin plates of each layer in the multi-layer plate structure are connected as a whole by rivets.

6. The composite vibration-damping bracket for ships according to claim 4, characterized in that: The acoustic black hole structure in the multilayer plate structure is processed by 3D printing and installed in the through hole on the thin plate by welding.

7. The composite vibration-damping bracket for ships according to claim 1, characterized in that: Vibration-damping mass blocks are provided on both the web (2) and the toggle plate (4).

8. The composite vibration-damping bracket for ships according to claim 7, characterized in that: The vibration-damping mass block is a hollow vibration-damping structure (3); the interior of the hollow vibration-damping structure (3) is filled with metal particles of irregular shape and different sizes for damping.

9. The composite vibration-damping bracket for ships according to claim 8, characterized in that: When the length of the hollow vibration-damping structure (3) exceeds a preset length, a partition is arranged inside the hollow vibration-damping structure (3).

10. A design method for a composite vibration-damping bracket for a ship, used for manufacturing a composite vibration-damping bracket for a ship as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: Basic structure design: Preliminary design of various parameters of the general support structure according to the installation requirements of the support to ensure that it can meet the basic strength requirements under working conditions; Design of acoustic black holes of the upper panel (1) and the bottom panel (5): dividing the thickness of the upper panel (1) and the bottom panel (5), and designing the acoustic black hole structure according to the thickness, size and selected material of the thin plates; Acoustic black hole design of the web (2) and the bracket (4): the web (2) and the bracket (4) are divided by thickness, and the acoustic black hole structure is designed according to the thickness, size and selected material of the thin plate; Vibration-isolating mass block position planning: planning the installation position of the vibration-isolating mass block at an appropriate position of the support structure; wherein the web (2) and the toggle plate (4) are both provided with vibration-isolating mass blocks; Optimization of the internal structure of the vibration-isolating mass block: when the length of the hollow vibration-isolating structure (3) constituting the vibration-isolating mass block exceeds a preset length, a partition is arranged at intervals inside the hollow vibration-isolating structure (3).

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