Low-frequency vibration reduction composite variable-thickness wave-absorbing damping plate structure
By adopting a low-frequency vibration reduction composite variable thickness wave-damping plate structure on ships, and utilizing the coupled resonance of plates of equal thickness and variable thickness, as well as the energy absorption of the damping plate, the complexity and weight problems of low-frequency vibration reduction control on ships are solved, achieving better vibration reduction effect and lightweighting.
Patent Information
- Application Number
- CN202520280421.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Existing ship vibration reduction and noise reduction technologies suffer from complexity, high cost, poor stability, and are not conducive to lightweighting in low-frequency vibration control, especially for large underwater vehicles that require a large amount of damping material.
The structure adopts a low-frequency vibration reduction composite variable thickness wave-damping plate structure, which includes a plate of equal thickness, a plate of variable thickness, and a damping plate. By adjusting its parameters, it achieves coupling resonance with the base panel, and a damping plate is set at the edge of the variable thickness plate to absorb low-frequency vibration energy, thereby reducing the amount of damping material to be laid.
This approach achieves better low-frequency vibration reduction while reducing costs and weight, meeting lightweight requirements and avoiding the excessive use of damping materials in traditional methods.
Smart Images
Figure CN223794557U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ship vibration reduction and noise reduction technology, and in particular to a low-frequency vibration reduction composite variable thickness wave damping plate structure. Background Technology
[0002] Vibration is a common physical phenomenon in the mechanical field, often adversely affecting mechanical and electronic equipment, thereby reducing their performance and lifespan. Vibration reduction is the means to minimize the impact of vibration, and various measures are available for different applications and situations. For ships, as large means of transportation, they undertake multiple functions, including the transport of personnel and materials. Vibration reduction in many parts of a ship, especially in areas with mechanical power output, is a significant issue that must be addressed based on theoretical and practical requirements, as well as shipbuilding specifications, to meet vibration requirements.
[0003] Current ship vibration reduction and noise reduction technologies have many limitations, especially in low-frequency vibration control. Vibration control can be mainly divided into two types: active control and passive control. While active control can effectively control low-frequency vibrations, active control systems are quite complex, lack stability, are costly, heavy, and require a large amount of space, leading to numerous problems in practical ship vibration reduction and noise reduction applications. Under normal circumstances, passive control methods are often preferred. The most basic form of passive control is to add damping materials to the location requiring vibration reduction. For some large underwater vehicles, a large amount of damping material needs to be pasted on the surface. Although this achieves vibration reduction and noise reduction, it is detrimental to structural lightweighting and has limited low-frequency vibration reduction. Utility Model Content
[0004] This utility model provides a low-frequency vibration reduction composite variable thickness wave-damping plate structure, which can provide better vibration reduction effect while reducing cost and weight and meeting the requirements of lightweight design. The technical solution is as follows:
[0005] This utility model embodiment provides a low-frequency vibration reduction composite variable thickness wave-damping plate structure, including: a base panel and a vibration reduction structure.
[0006] The vibration damping structure includes a plate of uniform thickness, a plate of variable thickness, and a damping plate. The plate of uniform thickness is attached to the base panel. The plate of variable thickness is connected to the side plate of the plate of uniform thickness in the thickness direction. The top surface of the plate of variable thickness is parallel to the top surface of the plate of uniform thickness. In the direction away from the plate of uniform thickness, the distance between the bottom surface and the top surface of the plate of variable thickness gradually decreases. The damping plate is disposed at the end of the top surface of the plate of variable thickness away from the plate of uniform thickness.
[0007] Optionally, multiple variable thickness plates are provided, and the multiple variable thickness plates are arranged to protrude around the outer contour of the constant thickness plate.
[0008] Optionally, in the direction away from the constant-thickness plate, the thickness of the variable-thickness plate satisfies the following formula:
[0009]
[0010] Wherein, h(x) is the thickness of the variable thickness plate; h0 is the maximum thickness of the variable thickness plate under power function variation; h1 is the minimum thickness of the variable thickness plate under power function variation; x is the distance from the constant thickness plate; and L is the maximum length of the variable thickness plate under power function variation.
[0011] Optionally, in the direction away from the constant thickness plate, the thickness of the variable thickness plate satisfies the following formula:
[0012]
[0013] Wherein, h(x) is the thickness of the variable thickness plate; hd0 is the maximum thickness of the variable thickness plate under the natural logarithmic function; hd1 is the minimum thickness of the variable thickness plate under the natural logarithmic function; x is the distance from the constant thickness plate; and Ld is the maximum length of the variable thickness plate under the natural logarithmic function.
[0014] Optionally, multiple vibration damping structures are provided, and the multiple vibration damping structures are stacked and arranged by the plates of equal thickness.
[0015] Optionally, the top surface of the variable thickness plate is flush with the top surface of the constant thickness plate.
[0016] Optionally, multiple vibration damping structures are provided, and the multiple vibration damping structures are arranged at intervals on the base panel.
[0017] Optionally, the constant thickness plate is a fiber-reinforced material plate, and the variable thickness plate is a steel plate.
[0018] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:
[0019] The low-frequency vibration reduction composite variable-thickness wave-damping plate structure provided in this embodiment of the invention utilizes a vibration-damping structure composed of a plate of uniform thickness, a plate of variable thickness, and a damping plate, arranged at locations of high vibration on the base panel, which is the controlled object. The plate of uniform thickness contacts the base panel, and the plate of variable thickness is connected to the side plate of the plate of uniform thickness. Adjusting the plate's length, width, and thickness relative to the plate of uniform thickness changes the overall natural frequency of the vibration-damping structure, achieving coupled resonance with the vibration source on the base panel. The damping plate, located at the edge of the plate of variable thickness, absorbs and dissipates low-frequency bending vibration energy, providing a reference for passive vibration control of ships. Compared with related technologies that directly cover the entire vibration-damping location, this approach significantly reduces the amount of damping material required, avoids limitations on the ship's placement, and provides better vibration reduction while achieving cost and weight reduction and meeting lightweight requirements. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a three-dimensional structural diagram of the low-frequency vibration reduction composite variable thickness wave-damping plate structure provided in this embodiment of the utility model;
[0022] Figure 2 This is a comparison diagram of the vibration characteristics of the base panel provided in this embodiment of the utility model and the base panel with added vibration damping structure;
[0023] Figure 3 This is a schematic diagram of the thickness change of a variable thickness plate based on a power function, provided in an embodiment of this utility model.
[0024] Figure 4 This is a schematic diagram of the thickness change of the variable thickness plate based on the natural logarithm, provided in an embodiment of this utility model.
[0025] Figure 5 This is a schematic diagram of one side of a disc baffle provided in an embodiment of the present invention;
[0026] Figure 6 This is a schematic diagram of the structure of the other side of an intervertebral disc baffle provided in an embodiment of this utility model;
[0027] Figure 7 This is a schematic diagram of one side of another vibration damping component provided in this embodiment of the present invention;
[0028] Figure 8This is a schematic diagram of the other side of another vibration damping component provided in this embodiment of the utility model.
[0029] In the figure: 1-base panel; 2-vibration damping structure; 11-reinforcing rib; 21-plate of uniform thickness; 22-plate of variable thickness; 23-damping plate. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.
[0031] Figure 1 This is a three-dimensional structural diagram of the low-frequency vibration reduction composite variable thickness wave-damping plate structure provided in this embodiment of the utility model; Figure 2 This is a comparison diagram of the vibration characteristics of the base panel provided in this embodiment of the utility model and the base panel with added vibration damping structure; Figure 3 This is a schematic diagram of the thickness change of a variable thickness plate based on a power function, provided in an embodiment of this utility model. Figure 4 This is a schematic diagram of the thickness change of the variable thickness plate based on the natural logarithm, provided in an embodiment of this utility model. Figure 5 This is a schematic diagram of one side of a disc baffle provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the other side of an intervertebral disc baffle provided in an embodiment of this utility model; Figure 7 This is a schematic diagram of one side of another vibration damping component provided in this embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of another vibration damping component provided in an embodiment of this utility model. (See diagram below.) Figures 1 to 8 As shown, this utility model embodiment provides a low-frequency vibration reduction composite variable thickness wave damping plate structure, including a base panel 1 and a vibration reduction structure 2.
[0032] The vibration damping structure 2 includes a plate of uniform thickness 21, a plate of variable thickness 22, and a damping plate 23. The plate of uniform thickness 21 is attached to the base panel 1, and the plate of variable thickness 22 is connected to the side panel of the plate of uniform thickness 21 in the thickness direction. The top surface of the plate of variable thickness 22 is parallel to the top surface of the plate of uniform thickness 21. In the direction away from the plate of uniform thickness 21, the distance between the bottom and top surfaces of the plate of variable thickness 22 gradually decreases. The damping plate 23 is disposed at the end of the top surface of the plate of variable thickness 22 away from the plate of uniform thickness 21.
[0033] In this embodiment of the invention, the low-frequency vibration reduction composite variable-thickness wave-damping plate structure is used to simulate passive vibration control at corresponding locations on an actual ship in a laboratory setting. The base panel 1 simulates the plate structure inside an actual ship's cabin used to house and install mechanical and electronic equipment. Figure 1The structure is topped with a crisscrossing reinforcing rib 11 to simulate the actual ship cabin environment. During the experiment, ABAQUS software was first used to establish a low-frequency vibration-damping composite variable-thickness wave-absorbing damping plate structure and an underwater vehicle equipment base structure based on the base panel 1. Harmonic response analysis was performed to calculate the control of the low-frequency vibration-damping composite variable-thickness wave-absorbing damping plate structure on the vibration of the base panel. To evaluate the system's vibration level and subsequent vibration reduction effect, the vibration acceleration of all nodes on the base panel 1 was extracted and compared to find the maximum value, thus determining the locations requiring targeted vibration reduction. (Reference) Figure 2 It is known that the peak vibration frequencies of the base panel 1 are located at 130Hz, 206Hz, 258Hz, and 320Hz, respectively. The 206Hz frequency corresponds to the area with reinforcing ribs 11 and is therefore disregarded. Three single-stage vibration damping structures 2 are then designed and manufactured. These three structures, acting as oscillator structures, have first-order natural frequencies close to 130Hz, 258Hz, and 320Hz, and are positioned at their corresponding peak vibration frequencies. When the base panel 1 at the corresponding position vibrates, its vibration wave propagates from the constant-thickness plate 21 to the variable-thickness plate 22. The bottom surface of the variable-thickness plate 22 is spaced apart from the base panel 1, and the distance between the bottom and top surfaces of the variable-thickness plate gradually decreases in the direction away from the constant-thickness plate 21, meaning its thickness gradually decreases. As the vibration wave propagates towards the edge of the variable-thickness plate 22, the amplitude increases and the wave velocity decreases with the decrease in structural thickness. The wave energy eventually concentrates in the area with the smallest thickness, which is the outermost end where the damping plate 23 is located. Ultimately, the high impedance performance of the damping plate 23 converts and dissipates the wave energy, thereby achieving vibration reduction and noise reduction, and realizing good low-frequency vibration suppression.
[0034] The low-frequency vibration reduction composite variable-thickness wave-damping plate structure provided in this embodiment of the invention utilizes a vibration reduction structure 2 composed of a plate of uniform thickness 21, a plate of variable thickness 22, and a damping plate 23, arranged at locations of high vibration on the base panel 1, which is the controlled object. The plate of uniform thickness 21 contacts the base panel 1, and the plate of variable thickness 22 is connected to the side plate of the plate of uniform thickness 21. Adjusting its length, width, and thickness relative to the plate of uniform thickness 21 changes the overall natural frequency of the vibration reduction structure 2, achieving coupled resonance with the vibration source on the base panel 1. The damping plate 23, located at the edge of the plate of variable thickness 22, absorbs and dissipates low-frequency bending vibration energy, providing a reference for passive vibration reduction control of ships. Compared with related technologies that directly cover the entire vibration-damping location, this method significantly reduces the amount of damping material required, avoids limitations on the ship's placement, and provides better low-frequency vibration reduction while reducing costs and weight and achieving lightweighting.
[0035] Optionally, multiple variable thickness plates 22 are provided, and the multiple variable thickness plates 22 are arranged to protrude from the outer contour of the constant thickness plate 21. Exemplarily, in this embodiment of the present invention, according to the vibration peak frequency of the corresponding part on the base panel 1, it is necessary to adjust the natural frequency by adjusting the length, width, and thickness of the variable thickness plates 22 arranged at intervals from the base panel 1 on the vibration damping structure 2. For example, in... Figure 1 In the embodiments described, multiple vibration damping structures 2 are provided within each area formed by the reinforcing ribs 11. These multiple vibration damping structures 2 are arranged at intervals on the base panel 1, corresponding to locations with different vibration peak frequencies. The single-layer vibration damping structure 2 with three variable thickness plates 22 corresponds to a vibration peak frequency of 258Hz. Since the base panel 1 locations corresponding to vibration peak frequencies of 130Hz and 320Hz are relatively close in the simulation evaluation, two vibration damping structures 2 with natural frequencies close to 130Hz and 320Hz are stacked using plates of equal thickness 21 and placed on the base panel 1, forming a multi-level composite variable thickness wave-damping structure to achieve coupled resonance with the vibration source. This stacking arrangement ensures wave damping and vibration reduction for low-frequency vibrations of multiple frequencies while further reducing the space occupied by the vibration damping structures 2, minimizing interference, and improving overall practicality.
[0036] It should be noted that, Figure 1 The single-stage arrangement and the multi-stage stacked arrangement of the vibration damping structure 2 are adaptive arrangements based on the location of the peak vibration frequency on the actual base panel 1. In other possible implementations, more vibration damping structures 2 can be stacked to achieve coupled resonance based on the number of closely spaced peak vibration frequencies, for example... Figure 7 and Figure 8 The three-level stacking form in the example.
[0037] Optionally, in one possible implementation of this utility model embodiment, the thickness of the variable thickness plate 22 in the direction away from the constant thickness plate 21 satisfies the following formula:
[0038]
[0039] Where h(x) is the thickness of the variable thickness plate 22; h0 is the maximum thickness of the variable thickness plate 22 under power function variation; h1 is the minimum thickness of the variable thickness plate 22 under power function variation; x is the distance from the constant thickness plate 21; and L is the maximum length of the variable thickness plate 22 under power function variation. Through this power function relationship, the following can be achieved: Figure 3 The thickness of the variable-thickness plate 22 varies with its distance from the edge of the constant-thickness plate 21 to form an arcuate ground shape that separates the variable-thickness plate 22 from the base panel 1. (Reference) Figure 1The variable thickness plate 22 connected to the long side of the rectangular plate of uniform thickness 21 adopts this kind of variation relationship.
[0040] Alternatively, in another possible implementation of this utility model embodiment, the thickness of the variable thickness plate 22 in the direction away from the constant thickness plate 21 satisfies the following formula:
[0041]
[0042] Where h(x) is the thickness of the variable thickness plate 22; h d0 h represents the maximum thickness of the variable thickness plate 22 under the natural logarithmic function. d1 L represents the minimum thickness of the variable thickness plate 22 under the natural logarithmic function; x is the distance from the constant thickness plate 21; L d Let be the maximum length of the variable thickness plate 22 as a function of the natural logarithm. Through this relationship of the natural logarithm, the following can be achieved: Figure 4 The thickness of the variable-thickness plate 22 varies with its distance from the edge of the constant-thickness plate 21 to form an arc-shaped bottom surface that is spaced apart from the base panel 1. (Reference) Figure 1 The variable thickness plate 22 connected to the two short sides of the rectangular constant thickness plate 21 adopts this variation relationship. The variable thickness plate 22 with a power function thickness variation relationship, together with a variable thickness plate 22 with a natural logarithmic thickness variation relationship, forms the vibration damping structure 2. Since the thickness variation rate of the natural logarithmic function is smaller than that of the power function, the variable thickness plate 22 with the natural logarithmic thickness variation has a higher absorption rate for vibration waves and less reflection, further improving the low-frequency vibration damping effect.
[0043] Optionally, the top surface of the variable thickness plate 22 is flush with the top surface of the constant thickness plate 21. For example, when stacking the multi-stage vibration damping structure 2, by setting the top surface of the variable thickness plate 22 to be flush with the top surface of the constant thickness plate 21, the variable thickness plate 22 can be provided with the maximum thickness range within the side plate surface of the constant thickness plate 21, so as to ensure a wider range of natural frequency variations and further improve adaptability.
[0044] Optionally, the constant thickness plate 21 is a fiber-reinforced material plate, and the variable thickness plate 22 is a steel plate. Exemplarily, in this embodiment of the invention, the constant thickness plate 21 serves as the connection structure between the vibration damping structure 2 and the base panel 1. It is made of composite materials such as glass fiber or carbon fiber and is combined with the steel variable thickness plate 22 to reduce the overall weight while ensuring mechanical strength, thus further improving practicality.
[0045] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0046] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A low-frequency vibration reduction composite variable thickness wave-damping plate structure, characterized in that, include: Base panel (1) and vibration damping structure (2), The vibration damping structure (2) includes a plate of equal thickness (21), a plate of variable thickness (22), and a damping plate (23). The plate of equal thickness (21) is attached to the base panel (1). The plate of variable thickness (22) is connected to the side plate of the plate of equal thickness (21) in the thickness direction. The top surface of the plate of variable thickness (22) is parallel to the top surface of the plate of equal thickness (21). In the direction away from the plate of equal thickness (21), the distance between the bottom surface and the top surface of the plate of variable thickness (22) gradually decreases. The damping plate (23) is disposed at the end of the top surface of the plate of variable thickness (22) away from the plate of equal thickness (21).
2. The low-frequency vibration reduction composite variable thickness wave-damping plate structure according to claim 1, characterized in that, Multiple variable thickness plates (22) are provided, and the multiple variable thickness plates (22) are arranged to protrude around the outer contour of the constant thickness plate (21).
3. The low-frequency vibration reduction composite variable thickness wave-damping plate structure according to claim 1, characterized in that, In the direction away from the constant thickness plate (21), the thickness of the variable thickness plate (22) satisfies the following formula: Wherein, h(x) is the thickness of the variable thickness plate (22); h0 is the maximum thickness of the variable thickness plate (22) under power function variation; h1 is the minimum thickness of the variable thickness plate (22) under power function variation; x is the distance from the constant thickness plate (21); and L is the maximum length of the variable thickness plate (22) under power function variation.
4. The low-frequency vibration reduction composite variable thickness wave-damping plate structure according to claim 1, characterized in that, In the direction away from the constant thickness plate (21), the thickness of the variable thickness plate (22) satisfies the following formula: Wherein, h(x) is the thickness of the variable thickness plate (22); hd0 is the maximum thickness of the variable thickness plate (22) under the natural logarithmic function; hd1 is the minimum thickness of the variable thickness plate (22) under the natural logarithmic function; x is the distance from the constant thickness plate (21); and Ld is the maximum length of the variable thickness plate (22) under the natural logarithmic function.
5. A low-frequency vibration reduction composite variable thickness wave-damping plate structure according to any one of claims 1 to 4, characterized in that, Multiple vibration damping structures (2) are provided, and multiple vibration damping structures (2) are stacked and arranged by the plates (21) of equal thickness.
6. The low-frequency vibration reduction composite variable thickness wave-damping plate structure according to claim 5, characterized in that, The top surface of the variable thickness plate (22) is flush with the top surface of the constant thickness plate (21).
7. A low-frequency vibration reduction composite variable thickness wave-damping plate structure according to any one of claims 1 to 4, characterized in that, Multiple vibration damping structures (2) are provided, and the multiple vibration damping structures (2) are arranged at intervals on the base panel (1).
8. A low-frequency vibration reduction composite variable thickness wave-damping plate structure according to any one of claims 1 to 4, characterized in that, The equal thickness plate (21) is a fiber reinforced material plate, and the variable thickness plate (22) is a steel plate.