A ship composite material large model acoustic performance test device

Abstract

The application relates to a kind of ship composite material large sample model acoustic performance test device, belong to the ship acoustic performance test technical field.The present application solves the problem that the acoustic performance test device of the ship composite material large sample model cannot be applied in the prior art, thereby leading to the problem that the acoustic performance test of the ship composite material cannot be carried out.The waterproof wall is circumferentially arranged and sealed and fixed to the outside of the shell plate, the upper surface of the waterproof wall is higher than the upper surface of the shell plate, the excitation disc is fixed to the upper surface of the shell plate and a threaded connection hole is formed in the axial direction thereof, the damping material layer is circumferentially laid and fixed to the outer wall of the waterproof wall, and the large sample model is fixed to the lower surface of the shell plate.The excitation disc is connected to the excitation device for excitation, the shell plate simulates the ship hull structure, the waterproof wall and the damping material layer effectively simulate the use environment of the acoustic covering layer inside and outside the ship cabin, and the installation and fixation of the ship composite material large sample model can be realized.

Description

Technical Field

[0001] This invention relates to a testing device for the acoustic performance of a large-scale model of ship composite materials, belonging to the field of ship acoustic performance testing technology. Background Technology

[0002] The shell structure is the medium connecting the internal skeleton structure of a ship with the external flow field, and it is also the main way for ship vibration energy to be transferred to the water. In order to reduce the transfer of ship vibration energy to the water, composite material structures are generally laid on the shell structure to achieve the purpose of ship vibration reduction and noise reduction. At present, the main method of acoustic tube testing based on small sample models is adopted. The so-called small sample model refers to a ship composite material sample specifically used for acoustic tube testing. The sample diameter is mainly 30 mm and 100 mm. However, small sample acoustic tube testing has some problems and shortcomings, mainly reflected in: (1) the test parameters are limited, and it is impossible to test parameters such as decoupling performance, vibration suppression performance, and vibration isolation index of composite material structure, making it difficult to comprehensively evaluate the acoustic performance of composite material structure; (2) for non-uniform materials with certain internal structures, the measurement results cannot well reflect the overall acoustic effect of composite material structure; (3) acoustic tube testing cannot consider the coupling effect between composite material and hull shell structure, and the test results are far from the actual ship application effect.

[0003] Using a large-scale model (1 meter × 1 meter or more) composed of one or several composite materials can effectively solve the above-mentioned problems and shortcomings in acoustic tube testing. However, in the current technology, there is no acoustic performance testing device suitable for large-scale composite material models. Therefore, there is an urgent need for an acoustic performance testing device suitable for large-scale ship composite material models, so as to realize the testing of acoustic performance evaluation parameters such as vibration suppression index, vibration isolation index, and radial surface vibration insertion loss of ship composite materials. Summary of the Invention

[0004] The present invention aims to address the problem that there is currently no acoustic performance testing device suitable for large-scale ship composite material models, which makes it impossible to test the acoustic performance evaluation parameters of ship composite materials. Therefore, the present invention provides an acoustic performance testing device for large-scale ship composite material models.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] An acoustic performance testing device for a large-scale ship composite material model includes a shell plate, a waterproof wall, a vibration disk, and a damping material layer. The waterproof wall is circumferentially enclosed and sealed to the outside of the shell plate, and the upper surface of the waterproof wall is higher than the upper surface of the shell plate. The vibration disk is fixed to the upper surface of the shell plate and has a threaded connection hole along its axial direction. The damping material layer is circumferentially laid and fixed to the outer wall of the waterproof wall. The large-scale model is fixed to the lower surface of the shell plate.

[0007] Furthermore, the shell plate is a rectangular shell plate structure, made of stainless steel, with a length and width ranging from 1m to 1.5m and a thickness ranging from 0.004m to 0.006m.

[0008] Furthermore, the waterproof enclosure is welded through to the sidewall of the shell plate.

[0009] Furthermore, the height difference between the upper surface of the waterproof enclosure and the upper surface of the shell plate is 20mm to 100mm.

[0010] Furthermore, the damping material layer is a free damping material structure layer.

[0011] Furthermore, the excitation disk has a cylindrical structure.

[0012] Furthermore, the upper surface of the shell plate is fixed with several reinforcing ribs arranged at equal intervals in the longitudinal and transverse directions, with the spacing between the reinforcing ribs being 0.3m to 0.5m.

[0013] Furthermore, the reinforcing rib is made of stainless steel, and the reinforcing rib is welded through to the shell plate.

[0014] Furthermore, the excitation disk is located in the middle of the shell plate and is fixed at the intersection of the transverse reinforcing rib and the longitudinal reinforcing rib.

[0015] Furthermore, a lifting frame is fixed to the upper part of the waterproof enclosure, and the lifting frame is welded through to the waterproof enclosure.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Using an exciter connected to an exciter for acoustic performance testing can effectively solve the limitations of existing acoustic tube testing, such as the difficulty in simulating the stiffened plate frame and outer shell of a real ship, and the inability to measure the shear modulus and acoustic performance under oblique incidence.

[0018] The acoustic performance testing device for large-scale ship composite materials of the present invention has a simple structure and is easier to operate. It simulates the ship hull structure through the shell plate and effectively simulates the use environment of ship composite materials inside and outside the ship cabin through the waterproof wall and damping material layer. It can realize the installation and fixation of large-scale ship composite material models, effectively solving some limitations of small-scale ship composite material models. For example, the boundary conditions have a great impact on the acoustic performance of the sample. If the boundary conditions are not well considered, the vibration reduction and noise reduction effect of the composite material cannot be effectively reflected. Therefore, it provides an effective device for acoustic performance testing of large-scale ship composite material models and has good practical value. Attached Figure Description

[0019] Figure 1 This is a schematic front sectional view of the present invention;

[0020] Figure 2 This is a top view of the present invention.

[0021] In the picture:

[0022] 1. Shell plate; 2. Waterproof enclosure; 3. Vibration plate; 31. Threaded connection hole; 4. Damping material layer; 5. Large model; 6. Reinforcing rib; 7. Lifting frame. Detailed Implementation

[0023] Specific implementation method one: Combining Figures 1-2 This description aims to clearly and completely illustrate the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the descriptions of "left," "right," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] An acoustic performance testing device for a large-scale model of a ship composite material includes a shell plate 1, a waterproof enclosure 2, a vibration disk 3, and a damping material layer 4. The waterproof enclosure 2 is circumferentially enclosed and sealed to the outside of the shell plate 1, and the upper surface of the waterproof enclosure 2 is higher than the upper surface of the shell plate 1. The vibration disk 3 is fixed to the upper surface of the shell plate 1 and has a threaded connection hole 31 along its axial direction. The damping material layer 4 is circumferentially laid and fixed to the outer wall of the waterproof enclosure 2. The large-scale model 5 is fixed to the lower surface of the shell plate 1.

[0027] The shell plate 1 serves as the backing substrate of the test apparatus, providing a mounting platform for the large-scale ship composite material model 5 to be tested. The large-scale model 5, composed of one or more pieces of ship composite material, is attached to the lower surface of the shell plate 1. The shell plate 1 is used to simulate the ship hull structure.

[0028] The waterproof enclosure 2 is seamlessly connected to the outer wall of the shell plate 1. By setting the waterproof enclosure 2, water is prevented from entering the upper surface of the shell plate 1 during the test.

[0029] The excitation disk 3 is preferably fixed in the middle of the shell plate 1. The excitation disk 3 has a threaded connection hole 31 for connecting with the excitation rod of the exciter. Using the excitation disk 3 connected to the exciter for acoustic performance testing can effectively solve the limitations of existing acoustic tube testing, such as the difficulty in simulating the stiffened plate frame, outer shell and other structures of a real ship, and the inability to measure the shear modulus and acoustic performance under oblique incidence.

[0030] The damping material layer 4 is tightly bonded to the waterproof enclosure 2 to prevent it from loosening or falling off. The damping material layer 4 can suppress vibration and noise, thereby reducing the vibration of the waterproof enclosure 2 during the test.

[0031] During the test, the large-scale acoustic performance testing device for ship composite materials of the present invention is lifted by an external hoisting structure. When the composite material is used in an underwater environment, it needs to be half-submerged in water to ensure that the height of the waterproof enclosure 2 above the water surface is greater than or equal to one-third of its own height before the corresponding test is carried out. When the composite material is used in an air environment, the corresponding test can be carried out directly.

[0032] The acoustic performance testing device for large-scale ship composite materials of this invention has a simple structure and is easier to operate. The shell plate 1 simulates the ship's hull structure, and the waterproof enclosure 2 and damping material layer 4 effectively simulate the usage environment of ship composite materials inside and outside the ship's cabins. It can install and fix large-scale ship composite material models 5, effectively solving some limitations of small-scale ship composite material models. For example, boundary conditions have a significant impact on the acoustic performance of the samples; and the inability to effectively reflect the vibration reduction and noise reduction effects of composite materials if boundary conditions are not adequately considered. Therefore, it provides an effective device for testing the acoustic performance of large-scale ship composite material models and has good practical value.

[0033] The shell plate 1 is a rectangular shell-like structure made of stainless steel. The length and width of the shell plate 1 range from 1m to 1.5m, and its thickness ranges from 0.004m to 0.006m. This design allows for an infinite curvature, which can be determined based on the actual ship structure. For example, the length and width of the shell plate 1 can be 1 meter, 1.2 meters, or 1.5 meters, the thickness can be 0.004 meters, 0.005 meters, or 0.006 meters, and the curvature can be infinite (flat plate), 10 meters, or 8 meters, etc.

[0034] The waterproof enclosure 2 is welded through to the side wall of the shell plate 1. This design ensures watertightness.

[0035] The height difference between the upper surface of the waterproof enclosure 2 and the upper surface of the shell plate 1 is 20mm to 100mm. With this design, when the test device is partially submerged in water, the dimensions can be designed to ensure that the height of the waterproof enclosure 2 above the water surface is greater than or equal to one-third of its own height.

[0036] The damping material layer is a free damping material structure. This design is mainly used to reduce the vibration response of auxiliary components under the excitation of the vibrator, and further ensure the effect of damping material layer 4 in suppressing noise vibration.

[0037] The excitation disk 3 has a cylindrical structure.

[0038] The upper surface of the shell plate 1 is fixed with a plurality of reinforcing ribs 6 arranged at equal intervals in both directions, with the spacing between the reinforcing ribs 6 being 0.3m to 0.5m. This design creates a grid-like arrangement of the reinforcing ribs 6. By fixing the reinforcing ribs 6 to the upper surface of the shell plate 1, the strength of the shell plate 1 is effectively improved. The structure composed of the shell plate 1 and the reinforcing ribs 6 further simulates the structure of a ship's hull. The spacing between the reinforcing ribs is, for example, 0.3m, 0.4m, or 0.5m.

[0039] The reinforcing rib 6 is made of stainless steel, and the reinforcing rib 6 is welded through to the shell plate 1. This design ensures that the overall welding deformation is less than or equal to 1 mm.

[0040] The excitation disk 3 is located in the middle of the shell plate 1 and is fixed at the intersection of the transverse reinforcing rib 6 and the longitudinal reinforcing rib 6.

[0041] A lifting frame 7 is fixedly mounted on the upper part of the waterproof enclosure 2, and the lifting frame 7 is welded to the waterproof enclosure 2 through. This design, by setting up the lifting frame 7, facilitates the overall installation of the test device on the external lifting structure, thereby facilitating the corresponding tests. The lifting frame 7 is made of stainless steel. The number of lifting frames 7 is, for example, two or four arranged opposite each other.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A testing device for the acoustic performance of a large-scale ship composite material model, characterized in that: The system includes a shell plate (1), a waterproof enclosure (2), an excitation disk (3), and a damping material layer (4). The waterproof enclosure (2) is circumferentially enclosed and sealed to the outside of the shell plate (1). The upper surface of the waterproof enclosure (2) is higher than the upper surface of the shell plate (1). The excitation disk (3) is fixed to the upper surface of the shell plate (1) and has a threaded connection hole (31) along its axial direction. The damping material layer (4) is circumferentially laid and fixed to the outer wall of the waterproof enclosure (2). The ship composite material model (5) is fixed to the lower surface of the shell plate (1). The shell plate (1) is a rectangular shell plate structure made of stainless steel. The length and width of the shell plate (1) are both 1m to 1.5m, and its thickness is 0.004m to 0.006m. The height difference between the upper surface of the waterproof enclosure (2) and the upper surface of the shell plate (1) is 20mm~100mm.

2. The acoustic performance testing device for a large-scale ship composite material model according to claim 1, characterized in that: The waterproof enclosure (2) is welded through to the side wall of the shell plate (1).

3. The acoustic performance testing device for a large-scale ship composite material model according to claim 1, characterized in that: The damping material layer (4) is a free damping material structure.

4. The acoustic performance testing device for a large-scale ship composite material model according to claim 1, characterized in that: The excitation disk (3) has a cylindrical structure.

5. The acoustic performance testing device for a large-scale ship composite material model according to claim 1, characterized in that: The upper surface of the shell plate (1) is fixed with several reinforcing ribs (6) arranged at equal intervals in the longitudinal and transverse directions, and the spacing between the reinforcing ribs (6) is 0.3m~0.5m.

6. The acoustic performance testing device for a large-scale ship composite material model according to claim 5, characterized in that: The reinforcing rib (6) is made of stainless steel and is welded through to the shell plate (1).

7. The acoustic performance testing device for a large-scale ship composite material model according to claim 5 or 6, characterized in that: The excitation disk (3) is located in the middle of the shell plate (1) and is fixed at the intersection of the transverse reinforcing rib (6) and the longitudinal reinforcing rib (6).

8. The acoustic performance testing device for a large-scale ship composite material model according to claim 1, characterized in that: The upper part of the waterproof enclosure (2) is fixed with a hoisting frame (7), and the hoisting frame (7) is welded through to the waterproof enclosure (2).

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