Nonlinear damper device

Abstract

The utility model provides a kind of nonlinear damping device, belong to vibration control and energy dissipation technical field, including shell, mass block, multilayer protruding structure and viscoelastic material block;Shell is used to be fixed in vibration source component, inside along the vibration direction of vibration source component sliding connection mass block, relative two sides inner wall between mass block and shell respectively form movement gap;Multilayer protruding structure is located on one of mass block and shell and protruding area decreases layer by layer;Viscoelastic material block is located on the other of mass block and shell and position corresponds with multilayer protruding structure.The nonlinear damping device provided by the utility model realizes nonlinear change of contact area by the staged contact between multilayer protruding structure and viscoelastic material block, obtains nonlinear curve and damping response, so as to be able to realize broadband vibration suppression, not only avoids complex multi-parameter coupling debugging process, and simple structure, environmental adaptability is strong, with good long-term stability.

Description

Technical Field

[0001] This utility model belongs to the field of vibration control and energy dissipation technology, and specifically relates to a nonlinear vibration reduction device. Background Technology

[0002] Vibration control and energy dissipation technology are crucial aspects of modern mechanical systems, civil structures, and precision equipment design. Their core objective is to reduce the vibration response amplitude caused by external excitation through energy dissipation or structural optimization. In traditional designs, common vibration control devices are primarily linear damping systems, such as linear spring-damped systems. These systems exhibit significant resonance amplification when the external excitation frequency approaches the system's natural frequency, leading to a sharp decline in damping performance. Furthermore, because the equivalent stiffness and damping coefficient of linear systems are fixed constants, they cannot automatically adjust according to changes in excitation amplitude and frequency, making it difficult to achieve wideband or adaptive damping effects. Therefore, nonlinear vibration reduction technology has gradually become a research hotspot.

[0003] Nonlinear vibration reduction technology introduces geometric or material nonlinear characteristics to enable the system to exhibit variable stiffness under different amplitudes or frequencies, thereby achieving better energy dissipation and vibration isolation performance. Existing nonlinear vibration reduction schemes include: using multi-stage spring combination structures to obtain nonlinear restoring forces; utilizing trajectory constraint mechanisms (such as arc tracks or cam structures) to generate nonlinear geometric coupling; and achieving controllable damping through magnetorheological fluids or electrorheological materials.

[0004] Currently, the existing nonlinear vibration reduction schemes mentioned above still have shortcomings: multi-stage spring combination structures and trajectory constraint mechanisms are too expensive to apply due to their complex structures and extremely high requirements for assembly precision; magnetorheological fluids and electrorheological materials are greatly affected by temperature, humidity and aging, resulting in significant performance degradation and poor long-term stability; and the nonlinear dynamic response under multi-parameter coupling is difficult to predict accurately, making design and control extremely difficult. Utility Model Content

[0005] This utility model provides a nonlinear vibration reduction device, which aims to solve the problems of existing nonlinear vibration reduction schemes mentioned in the background art, simplify the structure of nonlinear vibration reduction schemes, reduce the difficulty of control, and improve the vibration reduction bandwidth and long-term use stability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a nonlinear vibration damping device, comprising: The housing is used to fix the vibration source component, and a guide rod is provided inside along the vibration direction of the vibration source component; The mass block is slidably connected to the guide rod, and a movement gap is formed between the guide rod and the inner walls of the opposite sides of the housing in the axial direction; A multi-layered protruding structure is provided at the location corresponding to the movement gap between the mass block and the shell, and the protruding area of ​​the multi-layered protruding structure decreases layer by layer; A viscoelastic material block is located at another part of the mass block and the shell corresponding to the movement gap, and corresponds to the position of the multi-layer protrusion structure; The mass block reciprocates based on the vibration energy transmitted from the vibration source component to the shell, so that at least one layer of the multi-layer protrusion structure compresses the viscoelastic material block.

[0007] In one possible implementation, the housing has a multi-layered protrusion structure on both inner walls opposite each other in the axial direction of the guide rod, and viscoelastic material blocks are provided on both sides of the mass block facing the two movement gaps.

[0008] In some embodiments, the mass block has a notch at the center of the sidewall facing the two movement gaps, and the viscoelastic material block is embedded in the notch.

[0009] For example, the viscoelastic material block has a stepped hole at its center, which is suitable for the multi-layered protrusion structure to be embedded layer by layer and press against the corresponding stepped surface.

[0010] For example, the housing includes: The bottom shell is used to connect the vibration source components, and the center of the inner bottom wall is provided with a multi-layer protrusion structure. The inner bottom wall of the bottom shell is symmetrically provided with two guide rods around the multi-layer protrusion structure. The top cover is sealed to the bottom shell and connected to two guide rods. The top cover has a multi-layered protruding structure on the center of its surface facing the inside of the bottom shell.

[0011] In one possible implementation, each of the two guide rods is slidably fitted with a wear-resistant sleeve along its respective axis, and both wear-resistant sleeves are embedded in the mass block.

[0012] In some embodiments, the inner bottom wall of the bottom shell is provided with a first insertion hole suitable for inserting a guide rod, and the surface of the top cover facing the inside of the bottom shell is provided with a second insertion hole suitable for inserting a guide rod.

[0013] For example, a first adjusting pad is provided in both the first and second sockets, and a second adjusting pad is sandwiched between the top cover and the bottom shell.

[0014] For example, the bottom shell has connecting lugs on its two opposite outer walls for connecting the vibration source components.

[0015] In some embodiments, the top cover is provided with a support suitable for conforming to the mounting surface of the vibration source component.

[0016] The beneficial effects of the nonlinear vibration reduction device provided by this utility model are as follows: Compared with the prior art, the nonlinear vibration reduction device of this utility model, with the shell fixed to the vibration source component, enables the vibration to be directly transmitted to the shell, thereby causing the mass block slidably connected to the guide rod inside the shell along the vibration direction to reciprocate on the guide rod. At this time, the vibration energy is converted into the kinetic energy of the mass block. When the mass block reciprocates, the multi-layer protrusion structure repeatedly squeezes the viscoelastic material block, causing the viscoelastic material block to undergo shear and compression coupling deformation, thereby converting the kinetic energy of the mass block into the heat energy of the viscoelastic material block and dissipating it, thus achieving the vibration reduction effect on the vibration source component.

[0017] Because the protrusion area of ​​the multi-layered protrusion structure decreases layer by layer, when the amplitude of the vibration source component is small, the motion amplitude of the mass block is also relatively small. Only the topmost protrusion of the multi-layered protrusion structure compresses the viscoelastic material block, so the viscoelastic material block exhibits low stiffness characteristics. As the amplitude of the vibration source component increases, the motion amplitude of the mass block also increases, and the number of layers of the multi-layered protrusion structure compressing the viscoelastic material block gradually increases. At this time, the stiffness of the viscoelastic material block exhibits a nonlinear increase. Thus, by utilizing the graded contact between the multi-layered protrusion structure and the viscoelastic material block to achieve a nonlinear change in the contact area, a nonlinear curve and damping response can be obtained. This enables the suppression of broadband vibration of the vibration source component. It not only has a simple structure and good long-term stability, but also achieves controllable nonlinear mechanical response characteristics through the synergistic design of the viscoelastic material block and geometry without relying on complex structures. This avoids the problems of difficult prediction of nonlinear dynamic response and complex debugging process under multi-parameter coupling. Attached Figure Description

[0018] Figure 1 A three-dimensional structural schematic diagram of the nonlinear vibration reduction device provided in the embodiment of this utility model; Figure 2 A cross-sectional structural schematic diagram of the nonlinear vibration reduction device provided in this embodiment of the utility model; Figure 3 An exploded structural diagram of the nonlinear vibration reduction device provided in this embodiment of the utility model; Figure 4 A schematic diagram of the installation structure of the nonlinear vibration reduction device on the pipeline body provided in this embodiment of the utility model.

[0019] In the diagram: 10. Shell; 11. Bottom shell; 111. Connecting lug; 12. Top cover; 121. Support; 13. First adjusting pad; 14. Second adjusting pad; 20. Guide rod; 21. Wear-resistant sleeve; 30. Mass block; 300. Movement clearance; 31. Notch; 40. Multi-layer protruding structure; 50. Viscoelastic material block; 501. Stepped hole; 502. Stepped surface; 60. Pipe body; 70. Screw; 71. Nut; 80. Arc-shaped clamp. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0022] Please refer to the following: Figures 1 to 4 The nonlinear vibration damping device provided by this utility model will now be described. The nonlinear vibration damping device includes a housing 10, a mass block 30, a multi-layer protrusion structure 40, and a viscoelastic material block 50. The housing 10 is fixed to the vibration source component, and a guide rod 20 is arranged inside along the vibration direction of the vibration source component. The mass block 30 is slidably connected to the guide rod 20, and a movement gap 300 is formed between the guide rod 20 and the inner walls of opposite sides of the housing 10 in the axial direction. The multi-layer protrusion structure 40 is provided at one of the mass block 30 and the housing 10 at the position corresponding to the movement gap 300, and the protrusion area of ​​the multi-layer protrusion structure 40 decreases layer by layer. The viscoelastic material block 50 is provided at the other part of the mass block 30 and the housing 10 corresponding to the movement gap 300, and corresponds to the position of the multi-layer protrusion structure 40. The mass block 30 reciprocates based on the vibration energy transmitted from the vibration source component to the housing 10, so that at least one layer of the protrusion of the multi-layer protrusion structure 40 squeezes the viscoelastic material block 50.

[0023] It should be noted that in this embodiment, the mass block 30 forms a viscoelastic energy dissipation system based on the squeezing action of the multi-layer protrusion structure 40 on the viscoelastic material block 50. The basic principle of energy dissipation is that the multi-layer protrusion structure 40 squeezes the viscoelastic material block 50, causing it to deform. The deformation of the viscoelastic material block 50 causes the friction between its internal molecules to generate heat energy, which dissipates the energy. Thus, the vibration energy is converted into heat energy for energy dissipation.

[0024] Specifically, in this embodiment, the mass block 30 can be made of high-density metal material. Its function is to adjust the inertial parameters of the viscoelastic energy dissipation system to ensure that the main vibration mode frequency of the system is lower than the natural frequency of the structure. The viscoelastic material block 50 is a representative of materials that can provide nonlinear restoring force, such as rubber materials (natural rubber, butyl rubber, isoprene rubber, ethylene propylene rubber) and polymer materials (dampening plastics with polyurethane, polystyrene, polyvinyl chloride, and epoxy resin as the matrix).

[0025] In this embodiment, the multi-layered protrusion structure 40 can be a multi-layered structure with different shapes and thicknesses, such as... Figure 2 As shown, taking a three-layer protrusion structure as an example, the first layer protrusion has the largest area and the smallest surface curvature, or it can directly adopt a gentle slope structure. The second layer protrudes from the surface of the first layer and has a smaller area. The surface curvature of the second layer protrusion is larger than that of the first layer. The third layer protrudes from the surface of the second layer and its area is further reduced and its curvature is further increased, forming a protrusion that is close to a hemispherical shape.

[0026] Based on the aforementioned three-layer protrusion structure, when the periodic or transient excitation of the vibration source component is transmitted to the shell 10, the mass block 30 undergoes vibrational displacement relative to the shell 10, while the viscoelastic material block 50 deforms under the dual stresses of compression and shear from the three-layer protrusion structure. Specifically, in the low-amplitude vibration stage, only the third-layer protrusion compresses the viscoelastic material block 50, resulting in a low equivalent stiffness and a flexible response. As the amplitude increases, the second and first-layer protrusions gradually participate in compressing the viscoelastic material block 50, and the system stiffness exhibits a non-linear increase during this process. Through the geometric design of the multi-layer protrusion structure 40 (including but not limited to curvature variations and protrusion height differences), different contact stiffness ranges can be introduced at different vibration energy levels, forming a staged stiffness modulation mechanism without the need for complex spring-damping systems and magnetorheological coupling control.

[0027] Compared with the prior art, the nonlinear vibration reduction device provided in this embodiment allows the vibration to be directly transmitted to the housing 10 by fixing the housing 10 to the vibration source component. This causes the mass block 30, which is slidably connected to the guide rod 20 inside the housing 10 along the vibration direction, to reciprocate on the guide rod 20. At this time, the vibration energy is converted into the kinetic energy of the mass block 30. When the mass block 30 reciprocates, the multi-layer protrusion structure 40 repeatedly squeezes the viscoelastic material block 50, causing the viscoelastic material block 50 to undergo shear and compression coupling deformation. This converts the kinetic energy of the mass block 30 into the heat energy of the viscoelastic material block 50 and dissipates it, thereby achieving the vibration reduction effect on the vibration source component.

[0028] As the protrusion area of ​​the multi-layer protrusion structure 40 decreases layer by layer, when the amplitude of the vibration source component is small, the motion amplitude of the mass block 30 is also relatively small. Only the topmost protrusion of the multi-layer protrusion structure 40 compresses the viscoelastic material block 50, so the viscoelastic material block 50 exhibits low stiffness characteristics. As the amplitude of the vibration source component increases, the motion amplitude of the mass block 30 also increases, and the number of layers of the multi-layer protrusion structure 40 compressing the viscoelastic material block 50 gradually increases. At this time, the stiffness of the viscoelastic material block 50 exhibits a nonlinear increasing behavior. Thus, by utilizing the graded contact between the multi-layer protrusion structure 40 and the viscoelastic material block 50 to achieve nonlinear changes in the contact area, a nonlinear curve and damping response can be obtained. This enables the suppression of broadband vibration of the vibration source component. It not only has a simple structure and good long-term stability, but also achieves controllable nonlinear mechanical response characteristics through the synergistic design of the viscoelastic material block 50 and the geometry without relying on a complex structure. This avoids the problems of difficult prediction of nonlinear dynamic response and complex debugging process under multi-parameter coupling.

[0029] In some embodiments, see Figure 2 The housing 10 has multi-layered protrusion structures 40 on both inner walls opposite each other in the axial direction of the guide rod 20, and the mass block 30 has viscoelastic material blocks 50 on both sides facing the two movement gaps 300. Considering the bidirectional nature of vibration, the vibration energy transmitted from the vibration source component to the housing 10 causes the mass block 30 to reciprocate. Although a viscoelastic energy dissipation system with multi-layered protrusion structures 40 and viscoelastic material blocks 50 on only one side can also dissipate vibration energy, the effect of having multi-layered protrusion structures 40 and viscoelastic material blocks 50 on both sides along the vibration direction working together is better.

[0030] As one specific arrangement of the viscoelastic material block 50 on the mass block 30, please refer to Figure 2 The mass block 30 has a notch 31 at the center of the side wall facing the two movement gaps 300, and the viscoelastic material block 50 is embedded in the notch 31.

[0031] The function of the notch 31 is twofold: firstly, to improve the installation reliability of the viscoelastic material block 50 and prevent it from falling off the mass block 30 after frequent stress; secondly, to provide radial constraint on the viscoelastic material block 50 by using the notch 31, so that the deformation of the viscoelastic material block 50 caused by the compression of the multi-layer protrusion structure 40 is concentrated in the vibration direction, which is beneficial to improving the efficiency of vibration energy dissipation.

[0032] It should be noted that, as Figure 2As shown, in this embodiment, the viscoelastic material block 50 has a stepped hole 501 at its center. The stepped hole 501 is suitable for the multi-layer protrusion structure 40 to be embedded layer by layer and press against the corresponding stepped surface 502. The purpose of setting the stepped hole 501 is to allow the multi-layer protrusion structure 40 to be embedded layer by layer into each hole segment and press against the corresponding stepped surface 502, thereby avoiding mutual interference of the pressing action of adjacent protrusions on the viscoelastic material block 50, so that the viscoelastic material block 50 can obtain the expected nonlinear stiffness change curve. In addition, the timing of each layer of protrusions pressing against the corresponding stepped surface 502 can be adjusted by changing the height difference between adjacent stepped surfaces 502, thereby adjusting the equivalent resonant frequency and energy dissipation rate of the system. Thus, by replacing different viscoelastic material blocks 50, the parameter adjustability of the viscoelastic energy dissipation system can be achieved, thereby adapting to different excitation frequencies and vibration conditions.

[0033] As one specific structural form of the aforementioned housing 10, please refer to Figures 1 to 4 The housing 10 includes a bottom shell 11 and a top cover 12. The bottom shell 11 is used to connect the vibration source component, and the center of the inner bottom wall is provided with a multi-layer protrusion structure 40. The inner bottom wall of the bottom shell 11 is symmetrically provided with two guide rods 20 around the multi-layer protrusion structure 40. The top cover 12 covers the bottom shell 11 and is connected to the two guide rods 20. The center of the surface of the top cover 12 facing the inside of the bottom shell 11 is provided with a multi-layer protrusion structure 40.

[0034] The housing 10 adopts a detachable structure of bottom shell 11 and top cover 12, which not only facilitates processing and manufacturing but also facilitates the assembly of mass block 30 and viscoelastic material block 50. The bottom shell 11 and top cover 12 can be connected by several screws passing through the top cover 12 and then screwed to the side wall of the bottom shell 11, or by a snap-fit ​​connection based on corresponding buckles and holes on both; no specific limitation is made here. Two guide rods 20 symmetrically arranged on both sides of the multi-layered protruding structure 40 engage with the mass block 30 through a sliding fit, thereby improving the stability of the mass block 30 under vibration.

[0035] To ensure smooth sliding of the mass block 30 on the guide rod 20, and to avoid wear caused by frequent sliding friction between the two, such as... Figure 2 As shown, in this embodiment, each of the two guide rods 20 is slidably fitted with a wear-resistant sleeve 21 along its respective axial direction, and both wear-resistant sleeves 21 are embedded in the mass block 30. The wear-resistant sleeve 21 can be a copper sleeve or a polytetrafluoroethylene sleeve. Furthermore, lubricating grease can be applied between the wear-resistant sleeve 21 and the guide rod 20 to reduce frictional resistance and help improve service life.

[0036] For some possible implementations, please refer to [link / reference]. Figure 2The bottom wall of the bottom shell 11 is provided with a first insertion hole suitable for inserting the guide rod 20, and the surface of the top cover 12 facing the inside of the bottom shell 11 is provided with a second insertion hole suitable for inserting the guide rod 20. Both the first insertion hole and the second insertion hole are blind holes. Using the first insertion hole and the second insertion hole as the connection base for the guide rod 20, the structure is simple and easy to assemble.

[0037] Optionally, please see Figure 2 In this embodiment, a first adjusting pad 13 is provided in both the first and second sockets, and a second adjusting pad 14 is sandwiched between the top cover 12 and the bottom shell 11.

[0038] By changing the thickness of the first adjusting component or increasing or decreasing the thickness of the first adjusting pad 13, and simultaneously changing the thickness or increasing or decreasing the quantity of the second adjusting pad 14, the internal dimensions of the housing 10 in the axial direction of the guide rod 20 can be adjusted, thereby adjusting the size of the movement gap 300. This, in turn, changes the initial gap or pre-tightening state between the viscoelastic material block 50 and the multi-layer protrusion structure 40, thereby achieving the adjustment of the resonance frequency and energy dissipation rate, thus adapting to different excitation frequencies and vibration conditions.

[0039] It should be noted that, in combination Figure 1 and Figure 4 It is understood that the bottom shell 11 has connecting lugs 111 on its two opposite outer walls for connecting the vibration source component. By providing connecting lugs 111, the ease and reliability of installing the bottom shell 11 on the vibration source component can be improved.

[0040] For example, see Figure 1 and Figure 4 The top cover 12 is provided with a support 121 adapted to conform to the mounting surface of the vibration source component. The support 121 can form a fitting surface adapted to the mounting surface of the vibration source component. This improves the installation stability of the housing 10 on the vibration source component through the tight contact between the support 121 and the mounting surface, thereby ensuring that the vibration energy can be completely transferred to the housing 10. This is beneficial to improving the efficiency of the viscoelastic energy dissipation system composed of the viscoelastic material block 50 and the multi-layer protrusion structure 40 inside the housing 10.

[0041] It should be noted that the nonlinear vibration reduction device provided in this application is applicable to vibration suppression scenarios in mechanical systems, civil structures, and precision equipment. Therefore, the vibration source component can be understood as the component prone to vibration in the above scenarios. Taking pipe vibration suppression in civil structures as an example, the vibration source component is the pipe body 60, and the connection method between the shell 10 and the pipe body 60 is as follows: Figure 4 As shown: The support 121 has an arc surface that fits against the peripheral wall of the pipe body 60. The two connecting ears 111 are respectively hinged to the screws 70 by pins. The housing 10 is provided with an arc-shaped clamp 80 that fits against the pipe body 60. After the two screws 70 are passed through the arc-shaped clamp 80, the nuts 71 are screwed on, so that the arc-shaped clamp 80 fits with the pipe body 60 to clamp it. The installation is simple and stable and reliable.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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 nonlinear vibration damping device, characterized in that, include: A housing for fixing to the vibration source component, with guide rods provided inside along the vibration direction of the vibration source component; A mass block is slidably connected to the guide rod, and a movement gap is formed between the guide rod and the inner walls of the opposite sides of the housing in the axial direction; A multi-layered protruding structure is provided at a location corresponding to the movement gap in either the mass block or the shell, wherein the protruding area of ​​the multi-layered protruding structure decreases layer by layer; A viscoelastic material block is disposed at another location on both the mass block and the shell corresponding to the movement gap, and corresponds to the position of the multi-layer protrusion structure; The mass block reciprocates based on the vibrational energy transmitted from the vibration source component to the shell, so that at least one layer of the multi-layer protrusion structure squeezes the viscoelastic material block.

2. The nonlinear vibration reduction device as described in claim 1, characterized in that, The housing has the multi-layered protrusion structure on both inner walls opposite each other in the axial direction of the guide rod, and the mass block has the viscoelastic material blocks on both sides facing the two movement gaps.

3. The nonlinear vibration reduction device as described in claim 2, characterized in that, The mass block has a notch at the center of the sidewall facing the two movement gaps, and the viscoelastic material block is embedded in the notch.

4. The nonlinear vibration damping device as described in claim 3, characterized in that, The viscoelastic material block has a stepped hole at its center, which is suitable for the multi-layer protrusion structure to be embedded layer by layer and press against the corresponding stepped surface.

5. The nonlinear vibration reduction device as described in claim 1, characterized in that, The housing includes: The bottom shell is used to connect the vibration source component, and the inner bottom wall is provided with the multi-layer protrusion structure. The inner bottom wall of the bottom shell is symmetrically provided with two guide rods about the multi-layer protrusion structure. A top cover is attached to the bottom shell and connected to the two guide rods. The top cover has a multi-layered protrusion structure at the center of its surface facing the interior of the bottom shell.

6. The nonlinear vibration reduction device as described in claim 5, characterized in that, Each of the two guide rods is slidably fitted with a wear-resistant sleeve along its respective axis, and both wear-resistant sleeves are embedded in the mass block.

7. The nonlinear vibration damping device as described in claim 5, characterized in that, The inner bottom wall of the bottom shell is provided with a first insertion hole suitable for inserting the guide rod, and the surface of the top cover facing the inside of the bottom shell is provided with a second insertion hole suitable for inserting the guide rod.

8. The nonlinear vibration damping device as described in claim 7, characterized in that, Both the first and second sockets are provided with a first adjusting pad, and a second adjusting pad is sandwiched between the top cover and the bottom shell.

9. The nonlinear vibration reduction device as described in claim 5, characterized in that, The bottom shell has connecting lugs on its two opposite outer walls for connecting the vibration source component.

10. The nonlinear vibration reduction device as described in claim 5, characterized in that, The top cover is provided with a support suitable for conforming to the mounting surface of the vibration source component.

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