Particle damper with asymmetric baffles
By designing an asymmetric particle damper with baffles, the problem of weak energy dissipation under low excitation is solved through collision or shear compression between the baffles and particles, achieving efficient vibration energy dissipation and improving vibration reduction performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI UNIV
- Filing Date
- 2025-07-23
- Publication Date
- 2026-05-05
AI Technical Summary
Existing particle dampers are difficult to activate under low excitation amplitude, have weak energy dissipation capacity, and reduce vibration reduction performance.
Design an asymmetric particle damper with baffles. The baffles are rotatably connected to the damping cavity via a rotating shaft, forming an asymmetric lever structure. When vibrating, the baffles collide with or shear and compress the particles, thereby enhancing the energy dissipation capacity.
It significantly improves vibration reduction performance under low excitation amplitude, enhances particle activation probability and spatial disturbance intensity, and achieves efficient vibration energy dissipation.
Smart Images
Figure CN224201015U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of particle damper technology, and more specifically, it relates to a baffle asymmetric particle damper. Background Technology
[0002] Particle dampers have seen rapid development in recent years in aerospace, rail transportation, CNC machine tools, and large structures due to their advantages such as simple structure, no need for external energy, strong adaptability, and high temperature resistance. The basic principle of particle dampers is to dissipate vibrational energy by utilizing the collisions and friction between free particles in a closed cavity and between particles and the structure.
[0003] In existing technologies, particle dampers mostly have an internal cavity where particles move freely to dissipate energy. However, particles are difficult to activate under low excitation amplitude, resulting in weak energy dissipation capacity and reduced vibration reduction performance. Utility Model Content
[0004] This utility model provides a baffle-type asymmetric particle damper, which enables repeated interaction between the baffle and particles at low excitation amplitudes, thereby enhancing energy dissipation capacity and improving vibration reduction performance.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An asymmetric particle damper with baffles is provided, comprising a damping box and several baffles. The damping box has a damping cavity for accommodating particles. Several baffles are rotatably connected to the damping cavity via a rotating shaft. The main shaft of the rotating shaft extends horizontally, and the baffles are arranged in a matrix. The surface of the baffles extends radially along the rotating shaft. Each baffle includes an upper swing portion located above the rotating shaft and a lower swing portion located below the rotating shaft. The width of the lower swing portion extending radially along the rotating shaft is greater than the width of the upper swing portion extending radially along the rotating shaft. When the damping box is in a vibrating state, the baffles can swing and collide with particles to dissipate energy.
[0006] In one possible implementation, the two ends of the shaft are rotatably connected to the vibration damping box via bearings.
[0007] In some embodiments, the outer wall of the vibration damping box is provided with a through rotating hole for accommodating the bearing. At one end of the rotating hole near the vibration damping cavity, there is a converging platform at the central shaft to limit the displacement of the bearing into the vibration damping cavity. Two retaining rings are sleeved on the rotating shaft. The two retaining rings are located at the two opposite ends of the two bearings. The retaining rings are embedded in the inner peripheral wall of the rotating hole to limit the displacement of the bearing towards the outside of the vibration damping box.
[0008] In one possible implementation, the vibration damping box includes an upward-facing box body and a cover disposed on the box body for sealing the opening.
[0009] In one possible implementation, both ends of the shaft extend to the outside of the damping box, and both ends of the shaft are provided with through holes that are radially through them, with cotter pins inserted into the through holes.
[0010] In one possible implementation, the central axis of the through hole is set perpendicular to the surface of the baffle.
[0011] Compared with the prior art, the asymmetric particle damper with baffle provided in this embodiment causes the shell to vibrate when the damper is subjected to a low excitation amplitude. The baffle rotates around its axis due to its own inertia, forcing it to collide or shear and squeeze the free particles inside. The particles are driven to move multiple times in the cavity and repeatedly interact with the inner wall of the shell, the baffle or other particles, thereby enhancing the energy dissipation capacity and improving the vibration reduction performance. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.
[0013] Figure 1 A schematic diagram of the structure of the baffle asymmetric particle damper provided in this embodiment of the utility model;
[0014] Figure 2 A schematic diagram of the disassembly structure of the baffle-asymmetric particle damper provided in this embodiment of the utility model;
[0015] Figure 3 This is an embodiment of the present utility model. Figure 2 A magnified schematic diagram of the local structure at point I;
[0016] Figure 4 A schematic diagram of the structure of the baffle asymmetric particle damper for removing the vibration damping box provided in an embodiment of this utility model;
[0017] Figure 5 A schematic diagram of the housing of the baffle asymmetric particle damper provided in this embodiment of the utility model.
[0018] The following are the labeling elements in the figure:
[0019] 10. Vibration damping box; 11. Box body; 111. Vibration damping cavity; 112. Rotating hole; 113. Gathering platform; 12. Cover; 20. Baffle; 21. Upper swing part; 22. Lower swing part; 30. Bearing; 40. Retaining ring; 50. Cotter pin; 60. Rotating shaft; 61. Through hole. 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" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. 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 utility model, "a number" means two or more, unless otherwise explicitly specified.
[0022] Particle dampers have seen rapid development in recent years in aerospace, rail transportation, CNC machine tools, and large structures due to their advantages such as simple structure, no need for external energy, strong adaptability, and high temperature resistance. The basic principle of particle dampers is to dissipate vibrational energy by utilizing the collisions and friction between free particles in a closed cavity and between particles and the structure.
[0023] In existing technologies, particle dampers mostly have an internal cavity where particles move freely to dissipate energy. However, particles are difficult to activate under low excitation amplitude, resulting in weak energy dissipation capacity and reduced vibration reduction performance.
[0024] Please see Figures 1 to 5 The asymmetric particle damper with baffles provided by this utility model will now be described. The asymmetric particle damper with baffles includes a damping box 10 and a plurality of baffles 20. The damping box 10 has a damping cavity 111 for accommodating particles. The plurality of baffles 20 are rotatably connected to the damping cavity 111 by a rotating shaft 60. The main shaft of the rotating shaft 60 extends horizontally, and the plurality of baffles 20 are arranged in a matrix. The surface of the baffles 20 extends radially along the rotating shaft 60. The baffles 20 include an upper swing portion 21 located above the rotating shaft 60 and a lower swing portion 22 located below the rotating shaft 60. The width of the lower swing portion 22 extending radially along the rotating shaft 60 is greater than the width of the upper swing portion 21 extending radially along the rotating shaft 60. When the damping box 10 is in a vibrating state, the baffles 20 can swing and collide with particles to dissipate energy.
[0025] This application provides an asymmetric particle damper with a baffle. In actual use, the baffle 20 is designed such that the width of the lower swing portion 22 is significantly larger than that of the upper swing portion 21, forming an asymmetric lever structure. When not excited, it naturally hangs vertically under the action of gravity. When the system is subjected to external periodic or transient excitation, the shell vibrates, and the baffle 20 rotates around its axis due to its own inertia, colliding with or shearing and squeezing the free particles inside. The particles are driven to move multiple times in the cavity, repeatedly interacting with the inner wall of the shell, the baffle 20, or other particles, forming a complex energy dissipation mechanism.
[0026] The particles can be steel balls, ceramic particles, glass microspheres or polymer spheres, etc. The particle size distribution, mass ratio and filling rate can be adjusted according to the system frequency characteristics and excitation intensity to achieve wide-bandwidth, high-energy-consumption vibration control.
[0027] The presence of multiple baffles 20 significantly increases the particle activation probability and spatial disturbance intensity, achieving a strong energy dissipation effect even at low excitation amplitudes.
[0028] Compared with the prior art, the asymmetric particle damper with baffle provided in this embodiment causes the shell to vibrate when the damper is subjected to a low excitation amplitude. The baffle 20 rotates around its axis due to its own inertia, forcing it to collide or shear and squeeze the free particles inside. The particles are driven to move multiple times in the cavity and repeatedly interact with the inner wall of the shell, the baffle 20 or other particles, thereby enhancing the energy dissipation capacity and improving the vibration reduction performance.
[0029] In one possible implementation, the aforementioned rotating shaft 60 adopts as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The two ends of the rotating shaft 60 are rotatably connected to the vibration damping box 10 through bearings 30.
[0030] Specifically, the bearing 30 supports the rotating shaft 60, greatly reducing the rotational frictional resistance when the baffle 20 swings, ensuring a sensitive response even under slight vibrations. Compared to a sliding bushing, the bearing 30 can maintain a low coefficient of friction for a long time, preventing the rotating shaft 60 from jamming due to the intrusion of particulate dust, and significantly improving durability.
[0031] The standardized installation of bearing 30 simplifies the manufacturing process, facilitates later replacement and maintenance, and reduces the total life cycle cost.
[0032] In some embodiments, see Figures 3 to 5The outer wall of the vibration damping box 10 is provided with a through rotating hole 112 for accommodating the bearing 30. At one end of the rotating hole 112 near the vibration damping cavity 111, there is a converging platform 113 at the central shaft to limit the displacement of the bearing 30 into the vibration damping cavity 111. Two retaining rings 40 are sleeved on the rotating shaft 60. The two retaining rings 40 are located at the two opposite ends of the two bearings 30. The retaining rings 40 are embedded in the inner circumferential wall of the rotating hole 112 to limit the displacement of the bearing 30 outward from the vibration damping box 10.
[0033] Specifically, the gathering platform 113 prevents the bearing 30 from displacing into the vibration damping cavity 111, thus avoiding particles from entering the bearing 30 gap and causing wear; the retaining ring 40, embedded in the rotating hole 112, locks the outer side of the bearing 30, forming a double anti-disengagement mechanism. This design completely solves the problem of axial movement of the bearing 30 under vibration environment.
[0034] In one possible implementation, the aforementioned vibration damping box 10 adopts the following... Figure 1 and Figure 2 The structure shown is described in the following document. Figure 1 and Figure 2 The vibration damping box 10 includes a box body 11 with an upward opening and a cover 12 disposed on the box body 11 for sealing the opening.
[0035] Specifically, the split-type housing 11 with the cover 12 structure allows for quick opening, facilitating particle filling / replacement, baffle 20 inspection, and cavity cleaning. While the integrated housing 11 requires complex access ports, this design allows for direct removal of the cover 12 to expose the entire vibration damping cavity 111, significantly reducing maintenance difficulty and time costs.
[0036] The housing 11 can be cast or stamped independently, and the cover 12 uses standardized plates to reduce processing difficulty; the separate assembly also avoids the impact of welding deformation on the matrix accuracy of the internal baffle 20.
[0037] In one possible implementation, the aforementioned rotating shaft 60 adopts as follows: Figure 2 and Figure 3 The structure shown is described in the following document. Figure 2 and Figure 3 The two ends of the rotating shaft 60 extend to the outside of the vibration damping box 10. Both ends of the rotating shaft 60 are provided with through holes 61 that penetrate radially, and cotter pins 50 are inserted into the through holes 61.
[0038] Specifically, the two ends of the rotating shaft 60 extend outside the housing and are provided with through holes 61 and cotter pins 50 to form a mechanical interlock. Even if extreme vibration causes the bearing 30 to fail, the cotter pins 50 can still prevent the rotating shaft 60 from coming off, avoiding secondary damage caused by the disintegration of the baffle matrix 20, thus meeting the requirements of high reliability scenarios.
[0039] The exposed end of the 60-inch shaft allows direct observation of the cotter pin 50's condition, facilitating regular safety checks.
[0040] In some embodiments, see Figure 2 and Figure 3 The central axis of the through hole 61 is set perpendicular to the surface of the baffle 20.
[0041] Specifically, the through hole 61 is positioned perpendicular to the surface of the baffle 20 to ensure that the force direction of the cotter pin 50 is perpendicular to the swing plane of the baffle 20. When the baffle 20 swings due to particle impact, the cotter pin 50 mainly bears shear force (rather than torsional force), maximizing the utilization of the shear strength of the cotter pin 50 and preventing deformation or breakage of the cotter pin 50.
[0042] The above are merely preferred embodiments of the present utility model and are 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 baffle-type asymmetric particle damper, characterized in that, include: Vibration damping box, having a damping cavity for containing particles; as well as Several baffles are rotatably connected to the vibration damping cavity via a rotating shaft. The main shaft of the rotating shaft extends horizontally, and the several baffles are arranged in a matrix. The surface of the baffles extends radially along the rotating shaft. Each baffle includes an upper swing portion located above the rotating shaft and a lower swing portion located below the rotating shaft. The width of the lower swing portion extending radially along the rotating shaft is greater than the width of the upper swing portion extending radially along the rotating shaft. When the vibration damping box is in a vibrating state, the baffle can swing and collide with the particles to dissipate energy.
2. The baffle-type asymmetric particle damper as described in claim 1, characterized in that, Both ends of the rotating shaft are rotatably connected to the vibration damping box via bearings.
3. The baffle-type asymmetric particle damper as described in claim 2, characterized in that, The outer wall of the vibration damping box is provided with a through rotating hole for accommodating the bearing. At one end of the rotating hole near the vibration damping cavity, there is a converging platform at the central axis to limit the displacement of the bearing into the vibration damping cavity. Two retaining rings are sleeved on the rotating shaft. The two retaining rings are located at opposite ends of the two bearings. The retaining rings are embedded in the inner circumferential wall of the rotating hole to limit the displacement of the bearing outward from the vibration damping box.
4. The asymmetric particle damper with baffles as described in claim 1, characterized in that, The vibration damping box includes an upward-facing box body and a cover disposed on the box body for sealing the opening.
5. The asymmetric particle damper with baffles as described in claim 1, characterized in that, Both ends of the rotating shaft extend to the outside of the vibration damping box, and both ends of the rotating shaft are provided with through holes in a radial direction, and cotter pins are inserted into the through holes.
6. The baffle-type asymmetric particle damper as described in claim 5, characterized in that, The central axis of the through hole is perpendicular to the surface of the baffle.