A tunable attached acoustic black hole absorber coupled with a pvc spring
By coupling PVC springs with acoustic black hole vibration absorbers, efficient vibration reduction and noise reduction are achieved over a wide frequency range, solving the problem of suppressing time-varying line spectrum vibrations in existing technologies, without affecting structural stiffness and strength.
Patent Information
- Application Number
- CN202510358417.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2045-03-24
AI Technical Summary
Existing semi-active control methods are difficult to effectively suppress structural vibrations over a wide frequency band, especially the suppression effect on time-varying line spectrum vibrations is not ideal, and traditional acoustic black hole structures may reduce structural stiffness and strength.
Design a tunable attached acoustic black hole vibration absorber coupled with a PVC spring. It is mounted on the controlled structure through a frame. By utilizing the coupling system of the PVC spring and the vibration damping beam, combined with the acoustic black hole effect and the high damping characteristics of PVC gel, vibration reduction and noise reduction are achieved over a wide frequency range. The natural frequency and damping characteristics of the coupling system are changed by voltage regulation to suppress time-varying line spectrum vibrations.
It can effectively reduce vibration and noise over a wide frequency range, effectively suppress time-varying line spectrum vibrations in the structure, improve the vibration reduction effect, and does not reduce the structural stiffness and strength.
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Figure CN120175776B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration reduction and noise reduction equipment technology, and in particular to a tunable attached acoustic black hole vibration absorber coupled with a PVC spring. Background Technology
[0002] Vibration is a standing wave formed by multiple reflections from the boundaries of a structure, while noise is the wave energy radiated into the air by structural vibration. Therefore, controlling the wave behavior in a structure is an effective means of achieving vibration reduction and noise reduction. Currently, common wave control methods include passive, semi-active, and active methods. Passive control methods are simple in structure and highly effective, but once the structural parameters are determined, they struggle to handle time-varying line spectrum vibrations in the controlled structure. Active control methods can solve the problem of time-varying line spectrum vibrations in passive control through active adjustment, but require external energy and complex system design, resulting in higher costs. In contrast, semi-active methods combine the advantages of passive and active control, resulting in a relatively simple vibration reduction structure that can efficiently suppress time-varying vibrations with minimal energy consumption. However, existing semi-active control methods are typically only effective in certain frequency bands and struggle to achieve broadband vibration suppression.
[0003] The introduction of the acoustic black hole (ABH) effect has opened a new chapter in manipulating the propagation of bending waves in elastic media and structures. As a novel passive control method, acoustic black holes control wave propagation by optimizing structural shape, offering advantages such as light weight, high energy consumption, and wide operating bandwidth. Initially, acoustic black hole structures achieved vibration reduction and noise reduction by tailoring the controlled object, but this method reduced the stiffness and strength of the structure, limiting its application. Subsequently, domestic and international scholars developed various attached acoustic black hole vibration absorbers, which have been applied to major equipment, effectively suppressing vibrations over a wide frequency range by utilizing the high damping and large modal density of acoustic black holes. Although acoustic black holes have significantly suppressed vibrations, as a passive control method, its suppression effect on line spectrum vibrations caused by external excitation, especially time-varying excitations at non-natural frequencies, remains unsatisfactory.
[0004] Polyvinyl chloride (PVC) gel is a novel smart flexible material characterized by its simple actuation method, fast response speed, and good stability. When employing a sandwich structure of cathode (planar electrode plate) - PVC gel - anode (metal mesh electrode), external electrical stimulation causes negatively charged plasticizer molecules within the PVC gel to migrate to the anode side. Under the influence of Maxwell electrostatic force, the gel creeps into the mesh, causing the entire actuation structure to contract and deform in the thickness direction. After the electric field is removed, the PVC gel quickly returns to its initial state due to its elasticity. This unique deformation mechanism not only adjusts the stiffness in the thickness direction but also significantly enhances the friction between the PVC gel and the mesh when the gel matrix enters the metal mesh, altering the damping characteristics. Therefore, PVC gel holds promise as a smart component with a wide range of variable stiffness and damping properties.
[0005] In order to suppress structural vibration over a wide frequency range and effectively deal with time-varying line spectrum vibrations in the structure, it is necessary to design a novel semi-active vibration reduction structure that combines acoustic black holes and PVC gel springs. Summary of the Invention
[0006] Based on this, the purpose of the present invention is to provide a tunable attached acoustic black hole vibration absorber coupled with a PVC spring, which fully utilizes the advantages of acoustic black holes and PVC springs to improve vibration reduction effect.
[0007] To achieve the above objectives, the present invention provides the following solution:
[0008] This invention provides a tunable attached acoustic black hole vibration absorber with coupled PVC spring, including a vibration damping component and a frame;
[0009] The frame is a hollow block structure with openings on both sides. One end of the frame is used to connect to the controlled structure. The interior of the frame is used to position and connect the vibration damping components.
[0010] The vibration damping assembly includes a vibration damping beam, a PVC spring, a linear spring, and a connecting column; the linear spring, the connecting column, and the PVC spring are sequentially arranged inside the frame from the controlled structure to the other end of the frame; a vibration damping beam is arranged on each side of the connecting column;
[0011] The thickness of the longitudinal section of the vibration damping beam decreases exponentially from the side that is attached to the connecting column along the direction away from the connecting column.
[0012] Optionally, the frame includes an upper cover and a lower shell; the lower shell has a U-shaped structure, and the upper cover is detachably disposed at the open end of the lower shell; the closed end of the lower shell is used to connect with the controlled structure; the upper cover has an upper cover groove on the side facing the lower shell, and the lower shell has a lower shell groove on the side facing the upper cover; the upper cover groove is used to position the PVC spring, and the lower shell groove is used to position the linear spring.
[0013] Optionally, the PVC spring includes a plurality of adjustment units arranged sequentially along the axial direction of the damping assembly. Each adjustment unit includes a metal mesh electrode, a copper foil electrode, and PVC gel. A layer of PVC gel is disposed on both sides of the metal mesh electrode, and the copper foil electrode is disposed on the outer side of the PVC gel. The copper foil electrode is electrically connected to the cathode of the power supply, and the metal mesh electrode is electrically connected to the anode of the power supply.
[0014] Optionally, the PVC spring and the frame, the PVC spring and the connecting post, the connecting post and the linear spring, and the linear spring and the frame are all connected by adhesive bonding.
[0015] Optionally, the edge of the vibration damping beam is provided with an extension ring, the thickness of which is the same as the edge thickness of the vibration damping beam.
[0016] Optionally, the vibration damping component further includes a damping layer disposed on the upper end face and / or lower end face of the extension ring; the outer edge of the damping layer is flush with the outer edge of the extension ring.
[0017] Optionally, the end face of the vibration damping beam away from the controlled structure is a plane, and the perpendicular bisector of the plane is parallel to and not collinear with the center line of the connecting column.
[0018] Optionally, the exponent is expressed as h(wi) = awi m , i = 1, 2, where h(wi) represents the thickness of the vibration damping beam, wi, i = 1, 2 represent the distances from any point on the two edges of the end face of the connecting column away from the controlled structure to the corresponding parallel edge on the end face of the vibration damping beam away from the controlled structure, a represents a coefficient, and m is greater than or equal to 2.
[0019] Optionally, the frame, the vibration damping beam, and the connecting column are made of aluminum, and the linear spring is made of stainless steel.
[0020] Optionally, the extension ring, the vibration damping beam, and the connecting column are an integral structure.
[0021] The present invention achieves the following technical effects compared to the prior art:
[0022] This invention relates to a tunable, attached acoustic black hole vibration absorber coupled with PVC springs, mounted on a controlled structure via a frame. When the controlled structure is subjected to external excitation at a specific frequency, the wave within the structure is first transmitted through the frame to the linear spring and the PVC spring, and then propagates to the damping beam. During this process, due to the dynamic vibration absorption characteristics of the PVC spring-dampening beam coupling system with multiple natural frequencies, as well as the high damping and acoustic black hole effect of the PVC spring itself, the system can efficiently reduce vibration and noise over a wide frequency range. Furthermore, by adjusting the voltage across the PVC springs, the natural frequency and damping characteristics of the coupling system can be changed, effectively suppressing time-varying line spectrum vibrations in the controlled structure, further improving vibration and noise reduction performance. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 A schematic diagram of the tunable attached acoustic black hole vibration absorber with coupled PVC springs provided in Example 1;
[0025] Figure 2 A side view schematic diagram of the tunable attached acoustic black hole vibration absorber with coupled PVC springs provided in Embodiment 1;
[0026] Figure 3 This is a schematic diagram of the unit structure of the PVC spring provided in Example 1;
[0027] Figure 4 A schematic diagram of the propagation of elastic waves in the acoustic black hole beam provided in Example 1;
[0028] Figure 5 Frequency domain response diagrams of the tunable attached acoustic black hole vibration absorber with coupled PVC springs provided in Example 1 under different voltages;
[0029] Figure 6 Comparison of time-domain response of the tunable attached acoustic black hole vibration absorber with coupled PVC springs provided in Example 1;
[0030] Icons: 100, Tunable attached acoustic black hole vibration absorber with coupled PVC spring; 110, Vibration damping component; 111, Vibration damping beam; 112, PVC spring; 1121, Metal mesh electrode; 1122, Copper foil electrode; 1123, PVC gel; 113, Linear spring; 114, Connecting post; 115, Damping layer; 116, Extension ring; 120, Frame; 121, Top cover; 1211, Top cover groove; 1212, Top cover connection hole; 122, Lower shell; 1221, Lower shell groove; 1222, Lower shell connection hole; 200, Controlled structure. Detailed Implementation
[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.
[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] like Figures 1 to 4 As shown, this embodiment provides a tunable attached acoustic black hole vibration absorber with coupled PVC springs, specifically including a vibration damping component 110 and a frame 120; the inside of the frame 120 is used for positioning and connecting the vibration damping component 110, and the outside of the frame 120 is used for connecting to the controlled structure 200; the vibration damping component 110 includes a PVC spring 112, a linear spring 113, a connecting column 114, and vibration damping beams 111 on two opposing surfaces on the outer periphery of the connecting column 114; the two ends of the PVC spring 112 are fixedly connected to the frame 120 and the connecting column 114, and the PVC spring 112 can change its stiffness and damping under electric field excitation; the two ends of the linear spring 113 are fixedly connected to the frame 120 and the connecting column 114, and provide preload for the PVC spring 112; the thickness of the longitudinal section of the vibration damping beam 111 decreases exponentially from the side attached to the connecting column in the direction away from the connecting column.
[0034] The vibration damping assembly 110 and frame 120 are mounted on the controlled structure 200. Waves of a certain frequency emitted by the controlled structure 200 pass through the frame 120, and then simultaneously propagate through the PVC spring 112 and linear spring 113 of the vibration damping assembly 110 to the connecting column 114, and finally to the vibration damping beam 111. Because the thickness of the vibration damping beam 111 decreases exponentially, an acoustic black hole region is formed between the vibration damping beam 111 and the controlled structure 200. The wave propagation speed decreases as the thickness decreases, the wavelength decreases, and the wave amplitude increases, converging towards the region with decreasing thickness. Please refer to [link to relevant documentation]. Figure 4 By utilizing the dynamic vibration absorption characteristics of the coupling system of PVC spring 112 and vibration damping beam 111, which have multiple natural frequencies, as well as the high damping and acoustic black hole effect of PVC spring 112 itself, the system can achieve efficient vibration reduction and noise reduction over a wide frequency range. In addition, by changing the voltage across PVC spring 112, thereby changing the natural frequency and damping characteristics of the coupling system, the system can effectively suppress the time-varying line spectrum vibration in the controlled structure 200, further improving the vibration reduction and noise reduction effect on the controlled structure 200.
[0035] In this example, the preferred option is described in the following description. Figure 1 and Figure 2The frame 120 includes a detachable upper cover 121 and a lower shell 122. The upper cover 121 and the lower shell 122 constitute the frame 120. One end of the lower shell 122 is fixedly attached to the controlled structure 200 and has a small hole 1222 for fixed connection with the controlled structure 200. The upper cover groove 1211 and the lower shell groove 1221 are used for positioning and fixed connection of the vibration damping component 110. Specifically, the lower shell 122 is fixedly connected to the controlled structure 200 by a fixed thread. The upper cover 121 is provided with an upper cover hole 1212, and the open end of the lower shell 122 is provided with a threaded hole. The contact ends of the upper cover 121 and the lower shell 122 are fixedly connected by bolts, which facilitates installation and disassembly.
[0036] More preferably, the vibration damping component 110 is fixedly bonded to the inside of the frame 120; specifically, the PVC spring 112 is bonded to the upper cover groove 1211 and the connecting post 114 respectively, and the linear spring 113 is bonded to the lower shell groove 1221 and the connecting post 114 respectively. Since the vibration damping component 110 is fixedly connected to the frame 120, the wave in the controlled structure 200 is first transmitted to the frame 120, and then transmitted to the connecting post 114 through the PVC spring 112 and the linear spring 113.
[0037] More preferably, the extension rings 116 at both ends of the vibration damping beam 111 are provided with damping layers 115 parallel to the upper end face of the controlled structure 200, or damping layers 115 are provided on both the upper and lower end faces, and the outer edge of the damping layer 115 is flush with the outer edge of the extension rings 116, which can efficiently dissipate the energy of the system and improve the vibration reduction and noise reduction capabilities; specifically, the damping layer 115 can be made of butyl rubber material.
[0038] In the optional scheme of this example, more preferably, the center of the end face of the vibration damping beam 111 that is away from the controlled structure 200 and the perpendicular line of the end face is parallel to and not collinear with the center line of the connecting column 114. That is, the vibration damping beams 111 on both sides are eccentrically set relative to the connecting column 114. Compared with the symmetrical structure, the eccentric design allows the vibration damping beams 111 to have more different modes and to act in more frequency bands, giving full play to the advantages of the acoustic black hole energy gathering effect.
[0039] Specifically, the connecting column 114, the vibration damping beam 111, and the extension ring 116 can be integrally formed to ensure stability.
[0040] In this example, the preferred option is described in the following description. Figure 3The PVC spring 112 includes multiple adjustment units arranged sequentially along the axial direction of the vibration damping component. Each adjustment unit includes a metal mesh electrode 1121, a copper foil electrode 1122, and a PVC gel 1123. A layer of PVC gel 1123 is disposed on both sides of the metal mesh electrode 1121, and a copper foil electrode 1122 is disposed on the outer side of the PVC gel 1123. The copper foil electrode 1122 is electrically connected to the cathode of the power supply, and the metal mesh electrode 1121 is electrically connected to the anode of the power supply. After an electric field is applied, the PVC gel 1123 undergoes creep deformation under the action of the electric field and retracts into the mesh of the metal mesh electrode 1121, thereby changing the overall stiffness and damping of the PVC spring 112. This leads to changes in the modal frequency and damping of the vibration damping component 110, enabling the vibration absorber to change its operating frequency by adjusting the electric field for some time-varying line spectrum vibrations in the controlled structure 200, thus timely suppressing the line spectrum vibration and fully utilizing the advantages of the tunable attached acoustic black hole vibration absorber 100 coupled with the PVC spring.
[0041] More preferably, the shape of the contact surface of the copper foil electrode 1122, the polyvinyl chloride gel 1123 and the metal mesh electrode 1121 is consistent with that of the upper cover groove 1211, and the outline of the upper cover groove 1211 is slightly larger than the outer outline of the PVC spring 112. For example, if the PVC spring 112 is cylindrical with a circumferential diameter of 40 mm, the circumferential diameter of the upper cover groove 1211 can be set to 42 mm.
[0042] In the optional schemes of this example, more preferably, the frame 120, the vibration damping beam 111 and the connecting column 114 are made of aluminum, which has low mass and good strength, and the linear spring 113 is made of stainless steel, which is corrosion resistant, has high strength and long service life.
[0043] In this example, the preferred option is to refer to [reference needed]. Figure 1 and Figure 2 The cross-section of the vibration damping beam 111 is rectangular, the connecting column 114 is a rectangular column, and the expression for the exponential change in the thickness of the vibration damping beam 111 is h(wi) = awi. m , i = 1, 2, where h(wi) represents the thickness of the vibration damping beam 111, wi, i = 1, 2 represent the distances from any point on the two edges of the end face of the connecting column 114 away from the controlled structure 200 to the corresponding parallel edge on the end face of the vibration damping beam 111 away from the controlled structure 200, a represents a coefficient, and m is greater than or equal to 2.
[0044] The dimensions of the tunable attached acoustic black hole vibration absorber 100 with coupled PVC springs provided in this embodiment are determined according to actual requirements. The following provides a tunable attached acoustic black hole vibration absorber 100 with coupled PVC springs of specific dimensions, and a model is established in ABAQUS using the finite element method to calculate the frequency domain and time domain responses of the structure; please refer to... Figure 5 and Figure 6 The two edges of the upper end face of the connecting column 114 are perpendicular to the two edges of the upper end face of the vibration damping beam 111 and have two dimensions w. ABH1 =80mm, w ABH2 =100mm; the cross-sectional dimension of connecting column 114 is 50mm. 50mm; the upper end face dimension of vibration damping beam 111 is 180mm. The outermost layer is 50mm wide, with a maximum thickness of 3mm and a minimum edge thickness of 0.3mm; the extension ring 116 is 10mm wide and 0.3mm thick; the damping layer 115 is 10mm in size. The plate is 50mm long and 1mm thick; butyl rubber material is used for the arrangement, and the material loss factor is set to 0.3; the initial stiffness of PVC spring 112 is set to 200N / m, and the initial damping coefficient is set to 0.1N / (m / s). The stiffness and damping of PVC spring 112 increase with the increase of voltage; the stiffness of linear spring 113 is 10N / m; a uniform plate with a length of 300mm, a width of 240mm, and a thickness of 2mm is selected as the controlled structure 200, and the origin is established with the center point of the controlled structure 200 as the origin. In the coordinate system, a tunable attached acoustic black hole vibration absorber 100 with a coupled PVC spring is attached to the controlled structure 200 at (70, -100mm). Frequency sweep analysis is performed on the controlled structure 200 with and without the attached vibration absorber in the frequency range of 5-1000Hz. In order to illustrate the wideband vibration suppression effect of the vibration absorber and the suppression effect on time-varying line spectrum vibration, the stiffness and damping of the PVC spring 112 under different voltages are taken and substituted into the finite element model to calculate the frequency domain response and the time domain response under single-frequency excitation.
[0045] Analysis of calculation results
[0046] 1 Frequency Domain Response
[0047] like Figure 5 As shown, in order to evaluate the vibration level of the system, the origin displacement response of the system is selected as the index for study. Figure 5As can be seen, after adding the tunable attached acoustic black hole vibration absorber 100 with coupled PVC springs provided in this example, the vibration level of the controlled structure 100 can be reduced at the first resonant frequency of the controlled structure 100 under all voltages compared to the structure before control. This is because the tunable attached acoustic black hole vibration absorber 100 with coupled PVC springs provided in this example has a very high modal damping ratio due to the acoustic black hole effect and dynamic vibration absorption effect, and can make full use of its characteristics to absorb the wave energy on the controlled structure 200 and reduce the vibration level of the system. Furthermore, due to the eccentric design of the vibration damping beam 111, the structure has more natural frequencies, enabling the vibration absorber to couple better with the controlled object and better transfer the wave energy to the vibration absorber for dissipation, thus fully leveraging the energy focusing effect of the acoustic black hole. In addition, since the PVC spring 112 has adjustable stiffness and damping, the operating frequency of the vibration damping component can be adjusted in real time by controlling the stiffness and damping of the PVC spring 112 with voltage. This means that the tunable attached acoustic black hole vibration absorber 100 with coupled PVC spring has a wider operating frequency band and can suppress time-varying line spectrum vibrations in the structure.
[0048] 2 Time Domain Response
[0049] To simulate line spectrum vibration excitation, such as Figure 6 As shown, when the controlled structure 200 is excited by a 23Hz line spectrum vibration, although it does not cause the structure to resonate, if the excitation energy is too large, it will still cause vibration with a large amplitude. At this time, the stiffness and damping of the PVC spring 112 can be changed by adjusting the voltage, and the anti-resonance peak of the vibration absorber can be moved to the vicinity of the line spectrum frequency. Obviously, compared with the structure before being controlled, the overall displacement response has a significant reduction in vibration level.
[0050] The tunable attached acoustic black hole vibration absorber with coupled PVC spring 112 cleverly combines the characteristics of acoustic black holes and PVC spring 112, avoiding the limitations of traditional passive acoustic black holes. It can achieve efficient suppression of broadband and line spectrum vibrations by dynamically adjusting the natural frequency of the absorber.
[0051] The present invention can design parameters based on the frequency characteristics of the controlled object, which can further improve the broadband characteristics.
[0052] The tunable attached acoustic black hole vibration absorber 100 with coupled PVC spring of the present invention is lightweight, easy to meet engineering applications, and has the characteristics of high efficiency.
[0053] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.
[0054] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A tunable attached acoustic black hole absorber coupled with a PVC spring, characterized by, The application relates to a damping assembly and a frame. The frame is a hollow block structure with two open sides, one end of the frame is used for connecting with a controlled structure, and the inside of the frame is used for positioning and connecting the damping assembly. The damping assembly comprises a damping beam, a PVC spring, a linear spring and a connecting column, the inside of the frame is sequentially provided with the linear spring, the connecting column and the PVC spring from the controlled structure to the other end of the frame, and the two sides of the connecting column are respectively provided with the damping beam. The thickness of the longitudinal section of the damping beam decreases in an exponential form away from the connecting column. The PVC spring comprises a plurality of adjusting units sequentially arranged along the axial direction of the damping assembly, each adjusting unit comprises a metal mesh electrode, a copper foil electrode and PVC gel, the two sides of the metal mesh electrode are respectively provided with a layer of PVC gel, the outer side of the PVC gel is provided with the copper foil electrode, the copper foil electrode is electrically connected with the cathode of a power supply, and the metal mesh electrode is electrically connected with the anode of the power supply.
2. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The frame comprises an upper cover and a lower shell, the lower shell is a character-shaped structure, the upper cover is detachably arranged at the open end of the lower shell, the closed end of the lower shell is used for connecting with the controlled structure, one side of the upper cover facing the lower shell is provided with an upper cover groove, one side of the lower shell facing the upper cover is provided with a lower shell groove, the upper cover groove is used for positioning the PVC spring, and the lower shell groove is used for positioning the linear spring.
3. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The PVC spring and the frame, the PVC spring and the connecting column, the connecting column and the linear spring and the linear spring and the frame are all connected through adhesion.
4. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The edge of the damping beam is provided with an extension ring, and the thickness of the extension ring is the same as that of the edge of the damping beam.
5. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 4, wherein, The damping assembly further comprises a damping layer arranged on the upper end face and / or the lower end face of the extension ring, and the outer edge of the damping layer is flush with the outer edge of the extension ring.
6. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The end face of the damping beam away from the controlled structure is a plane, the median line of the plane is parallel to and not collinear with the center line of the connecting column.
7. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The expression of the index is h(wi) = awi m , i = 1, 2, wherein h(wi) represents the thickness of the damping beam, wi, i = 1, 2 respectively represents the distance from any point on the two edges of the end face of the connecting column away from the controlled structure to the corresponding parallel edges on the end face of the damping beam away from the controlled structure, a represents a coefficient, and m is greater than or equal to 2.
8. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 1, wherein, The frame, the damping beam and the connecting column are made of aluminum, and the linear spring is made of stainless steel.
9. The tunable attached acoustic black hole vibration absorber coupled with a PVC spring of claim 5, wherein, The extension ring, the damping beam and the connecting column are integrated.
Citation Information
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Loudspeaker module and electronic equipment
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