A granular damper and design method
By designing a combination of vibration-damping structure and damping particles in the particle damper, the effective area is increased and the vibration reduction frequency range is broadened, solving the problem of poor vibration reduction effect of traditional particle dampers and achieving a wider range of vibration reduction effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN UNIV
- Filing Date
- 2025-01-23
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional particle dampers have poor vibration reduction performance and cannot effectively reduce vibration over a wide frequency band.
Design a particle damper that combines a vibration reduction structure with damping particles. The vibration energy is dissipated through friction and collision between internal particles and friction and collision between the shell and particles. The vibration reduction structure increases the effective area and widens the vibration reduction frequency range.
This improves the vibration reduction effect of particle dampers and broadens their application range, especially in the mid-to-high frequency range and near the natural frequency.
Smart Images
Figure CN122447441A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration damping technology, and in particular to a particle damper and its design method. Background Technology
[0002] Particle dampers dissipate vibrational energy through collisions and friction between particles and between particles and the container wall. This mechanism enables them to effectively reduce vibration over a wide frequency range. Due to their nonlinear characteristics, particle dampers exhibit good vibration reduction effects under both random vibration and steady-state excitation. Particle dampers show even better vibration reduction performance in the mid-to-high frequency range and near their natural frequencies. This makes them suitable for various engineering applications, such as vibration and noise reduction in rail transit systems. Overall, particle dampers, with their simplicity, efficiency, adaptability, and wide-bandwidth vibration reduction capabilities, demonstrate broad application potential in various engineering fields.
[0003] Traditional particle dampers divide the damper into multiple independent cavities and fill the cavities with particles to achieve the vibration reduction effect. However, this method relies solely on the particles in the damper to dissipate vibration energy, resulting in poor vibration reduction performance.
[0004] It is evident that how to solve the problem of poor vibration reduction effect of traditional particle dampers is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention
[0005] In view of this, the present invention provides a particle damper that solves the problem of poor vibration reduction effect of traditional particle dampers by setting a vibration reduction structure.
[0006] The present invention also provides a design method for a particle damper including the above-described particle damper.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A particle damper, the particle damper comprising:
[0009] A housing having a portion for mounting the object to be damped;
[0010] A vibration damping structure, comprising: a base plate and a plurality of vibration damping plates, wherein the plurality of vibration damping plates are arranged in parallel and spaced apart on the base plate; the plurality of vibration damping plates are assembled into the housing via the base plate;
[0011] Damping particles; the damping particles are filled inside the shell.
[0012] Preferably, the length of the end of the plurality of damping plates away from the substrate gradually increases in the vertical direction.
[0013] Preferably, there are two vibration damping structures, which are arranged symmetrically along the length of the shell and spaced apart.
[0014] Preferably, the length of the end of the plurality of damping plates of each damping structure away from the substrate increases vertically from top to bottom according to a power law or an arithmetic sequence.
[0015] Preferably, in the first vibration damping structure, the length of the end of the plurality of damping plates away from the substrate increases vertically from bottom to top according to a power law or an arithmetic sequence, and in the second vibration damping structure, the length of the end of the plurality of damping plates away from the substrate increases vertically from top to bottom according to a power law or an arithmetic sequence.
[0016] Preferably, the housing comprises: a housing body and a top cover plate;
[0017] The top surface of the housing body is an open top surface, and the upper cover plate is used to cover the open top surface; at least one side of the housing body is an open side surface, and the side of the base plate connected to the vibration damping plate is used to cover the open side surface.
[0018] Preferably, the upper cover plate is bolted to the top surface of the opening to achieve a removable cover.
[0019] Preferably, the substrate is sealed to the side of the opening by a connecting plate, and the substrate and the connecting plate are detachably connected.
[0020] Preferably, the length direction of the damping plate is parallel to the length direction of the housing, and the width direction of the damping plate is parallel to the width direction of the housing, wherein the length direction is from one end of the damping plate disposed on the substrate to the end of the damping plate away from the substrate;
[0021] The width of the housing is greater than the width of the damping plate; the damping plate is centrally located such that there is a first gap between the long edge of the damping plate and the housing, the first gap being greater than 1.5 times the diameter of the damping particle.
[0022] Preferably, the spacing between adjacent damping plates is greater than 1.5 times the diameter of the damping particles.
[0023] Preferably, the substrate is set at a 90-degree angle to the bottom plate of the housing, so that the damping plate is parallel to the bottom plate;
[0024] The base plate is the part used to install the object to be damped.
[0025] A design method for a particle damper, the design method comprising:
[0026] Obtain the mass of the object to be damped and the damping space for installing the particle damper on the object to be damped, wherein the particle damper is the particle damper described above.
[0027] Based on the mass, the mass of the particle damper to be installed is obtained. An equivalent mass block is used to replace the particle damper to be installed. The equivalent mass block is installed on the object to be damped. Experiments or simulations are conducted to obtain the first damping peak value. The first damping peak value is the damping peak value of the object to be damped after the equivalent mass block is installed on the object to be damped.
[0028] The housing dimensions of the particle damper to be installed are designed based on the aforementioned vibration reduction space.
[0029] Based on the aforementioned housing dimensions, a housing for the particle damper to be installed is fabricated, and the vibration reduction space is capable of accommodating at least one of the housings.
[0030] Experiments or simulations are conducted on the particle damper to be tested to obtain the modal frequencies of each damping plate in the vibration reduction structure.
[0031] If the modal frequency of at least one of the damping plates is equal to the first damping peak value, then the corresponding damping structure is taken as the optimal damping structure; if the modal frequencies of each of the damping plates are not equal to the first damping peak value, then the structure of the damping structure is adjusted until the modal frequency of at least one of the damping plates is equal to the first damping peak value, and then the damping structure corresponding to the adjustment where the modal frequency of at least one of the damping plates is equal to the first damping peak value is taken as the optimal damping structure.
[0032] Based on the aforementioned housing dimensions and the optimal vibration damping structure, a particle damper to be installed is fabricated.
[0033] As can be seen from the above technical solution, the particle damper provided by the present invention (eliminating the independent cavity setting of the traditional particle damper) dissipates the vibration energy through the friction and collision between the internal damping particles and the friction and collision between the shell and the damping particles. In addition, the vibration damping structure is set as part of the particle damper, which increases the interaction area between the particle damper and the damping particles, further improving the damping energy dissipation effect of the tuned resonator. At the same time, due to the different lengths of the damping plates, the vibration damping frequency range can be widened, improving the damping effect and making the particle damper more widely applicable.
[0034] The present invention also provides a design method for a particle damper. Since the above-mentioned particle damper is used, it has corresponding beneficial effects, which can be referred to the previous description and will not be repeated here. Attached Figure Description
[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0036] Figure 1 An isometric view of the overall particle damper provided in an embodiment of the present invention;
[0037] Figure 2 A plan view of the vibration reduction structure provided in an embodiment of the present invention;
[0038] Figure 3 A perspective view of a particle damper provided in an embodiment of the present invention (without damping particles).
[0039] Figure 4 A front view of a particle damper provided in an embodiment of the present invention;
[0040] Figure 5 A side view of a particle damper provided in an embodiment of the present invention;
[0041] Figure 6 This is a top view of the particle damper provided in an embodiment of the present invention;
[0042] Figure 7 A perspective front view of a particle damper provided in an embodiment of the present invention (filled with damping particles).
[0043] Figure 8 An exploded view of a particle damper provided in an embodiment of the present invention (without damping particles).
[0044] Figure 9 This is a perspective view of a particle damper provided for another embodiment of the present invention (without damping particles).
[0045] Figure 10 Schematic diagram of the internal structure design of a particle damper;
[0046] Figure 11 This is a schematic diagram of the particle damper installed inside the experimental setup.
[0047] Figure 12 The first comparison image is shown (this particle damper is not filled with damping particles).
[0048] Figure 13 The second comparison chart shows the vibration reduction effect of this particle damper, which is filled with damping particles, under large vibration levels.
[0049] Figure 14The third comparison chart shows the vibration reduction effect of this particle damper filled with damping particles under micro-vibration.
[0050] The meanings of the various reference numerals in the figure are as follows:
[0051] 1 is the particle damper, 10 is the shell, 11 is the shell body, and 12 is the top cover plate;
[0052] 20 is the vibration damping structure, 21 is the base plate, and 22 is the vibration damping plate;
[0053] 30 represents damping particles; 40 represents bolts; 50 represents connecting plates;
[0054] 60 is the test device, 61 is the upper surface of the rectangular frame, and 62 is the vibrator. Detailed Implementation
[0055] 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.
[0056] The particle damper provided in the embodiments of the present invention, such as Figures 1-14 The particle damper 1 includes:
[0057] Housing 10, housing 10 having a portion for mounting the object to be damped;
[0058] The vibration damping structure 20 includes: a substrate 21 and a plurality of vibration damping plates 22, which are arranged parallel and spaced apart on the substrate 21.
[0059] Damping particles 30; damping particles 30 are filled inside the shell 10.
[0060] In the above technical solution, the particle damper 1 (eliminating the traditional independent cavity setting of the particle damper) is installed on the object to be damped. The particle damper 1 dissipates the vibration energy through the friction and collision between the internal damping particles 30 and the friction and collision between the shell 10 and the damping particles 30. In addition, the damping structure 20 is set as part of the particle damper 1, which increases the interaction area between the particle damper 1 and the damping particles 30, further improving the damping energy dissipation effect of the tuned resonator.
[0061] In an alternative embodiment, such as Figure 3 , Figure 4 , Figure 7 and Figure 9As shown, the lengths of the multiple damping plates 22 at the ends furthest from the substrate 21 gradually increase in the vertical direction. This gradual increase in length of the multiple damping plates 22, due to their varying lengths, broadens their modal frequency range, improves the damping effect, and expands the application range of this particulate damper 1. Furthermore, the multiple damping plates 22 have equal lengths, and the modal frequencies corresponding to the damping plates 22 are equal to the first modal frequency.
[0062] In an alternative embodiment, such as Figure 3 , Figure 4 , Figure 7 and Figure 9 As shown, there are two damping structures 20, which are symmetrically arranged along the length of the housing 10 and spaced apart. The two damping structures 20 further improve the damping effect of the particle damper. This can be understood as follows: the end of the damping plate 22 fixed to the base plate 21 is the first end, and the end of the damping plate 22 away from the base plate 21 is the second end. The second end of the damping plate 22 in the first damping structure 20 is spaced apart from the second end of the symmetrical second damping structure 20 (i.e., there is a distance between the second end of the damping plate 22 and the second end of the symmetrical damping plate 22, such as...). Figure 3 (As shown).
[0063] It should be noted that the particle damper 1 converts mechanical energy into heat energy through the collision and friction between the damping particles 30, and the vibration reduction structure 20 absorbs energy through the reduction of wave velocity and the strain of the damping material. While the vibration reduction structure 20 vibrates, it dissipates the energy through the collision and friction with the damping particles 30, thus expanding the application scenarios of the particle damper 1. It should also be noted that the vibration reduction structure 20 can be made of damping material, or the surface of the vibration reduction structure 20 can be coated with damping material. In addition, the base plate 21 and multiple damping plates 22 of the vibration reduction structure 20 can be detached for structural replacement, thereby adjusting the vibration reduction effect. The base plate 21 and the damping plates 22 are connected by snap-fit or magnetic connection to achieve detachability.
[0064] Optimize the above technical solutions, such as Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 10 As shown, the length of the end of the plurality of damping plates 22 of each damping structure 20 away from the substrate 21 is vertical from top to bottom (vertical direction as shown). Figure 3The length of the damping plate 22 (in both upward and downward directions) increases according to a power law or an arithmetic sequence. This arrangement ensures that the longer damping plate 22 is at the bottom of the particle damper, and the shorter damping plate 22 is at the top of the particle damper. It should be noted that the damping structure 20 can absorb and cancel the vibration energy of the system. This structure can significantly reduce the vibration amplitude at the resonant frequency and broaden its modal frequency range. It should also be noted that vibration suppression in a specific frequency band can be achieved by designing the size and material parameters of the damping plate 22.
[0065] In an alternative embodiment, such as Figure 9 and Figure 10 As shown, in order to make the structure of the particle damper 1 compact and save the material used in the housing 10, the length of the ends of the multiple damping plates 22 of the first damping structure 20 away from the base plate 21 increases vertically from bottom to top according to a power law or an arithmetic sequence. Similarly, the length of the ends of the multiple damping plates 22 of the second damping structure 20 away from the base plate 21 increases vertically from top to bottom according to a power law or an arithmetic sequence. Figure 9 The up and down directions.
[0066] In an alternative embodiment, such as Figure 8 As shown, the housing 10 includes: a housing body 11 and an upper cover plate 12;
[0067] The top surface of the housing body 11 is an open top surface, and the upper cover plate 12 is used to cover the open top surface; at least one side of the housing body 11 is an open side surface, and the side of the base plate 21 connected to the damping plate 22 is used to cover the side surface with the open surface. The setting of the open side surface is conducive to the rapid assembly of the damping structure 20. Preferably, the base plate 21 and the damping plate 22 are integrally formed, which further improves the assembly speed of the damping structure 20.
[0068] To optimize the above technical solution, the upper cover plate 12 is sealed to the top surface of the opening by bolts 4 to achieve a detachable cover. Bolts 4 are 7-M3 hexagon socket bolts. Of course, the upper cover plate 12 and the top surface of the opening can also be magnetically connected. In addition, the upper cover plate 12 and the housing body 11 are detachably connected to facilitate the replacement of the damping particles 30. Preferably, the various components of the particle damper 1 are connected by various methods such as gluing, welding, and bolting.
[0069] In an alternative embodiment, such as Figure 8As shown, the substrate 21 is sealed to the side of the opening by the connecting plate 50, and the substrate 21 and the connecting plate 50 are detachably connected to achieve quick replacement and assembly of the vibration damping structure 20. Preferably, the side of the connecting plate 50 away from the substrate 21 is fixedly connected to the side of the opening, and the connecting plate 50 is a U-shaped plate whose contour matches the edge of the side of the opening. Preferably, the substrate 21 has a first connecting hole, and the connecting plate 50 has a second connecting hole, so that the M3 bolt passes through the first connecting hole and the second connecting hole in sequence to fix the substrate 21 to the connecting plate 50; in addition, the connecting plate 50 is connected to the edge of the side of the opening by laser welding.
[0070] In an alternative embodiment, such as Figure 4 and Figure 5 As shown, the length direction of the damping plate 22 is parallel to the length direction of the housing 10, and the width direction of the damping plate 22 is parallel to the width direction of the housing 10. The length direction is from one end of the damping plate 22 disposed on the substrate 21 to the end of the damping plate 22 away from the substrate 21 (that is, from the first end of the damping plate 22 to the second end of the damping plate 22).
[0071] The width of the housing 10 is greater than the width of the damping plate 22; the damping plate 22 is centrally located such that there is a first gap between the long edge of the damping plate 22 and the housing 10, and the value of the first gap is greater than 1.5 times the diameter of the damping particle 30. This arrangement prevents the long edge of the damping plate 22 from blocking the damping particle 30 during vibration, thus affecting the damping effect.
[0072] In an alternative embodiment, such as Figure 4 and Figure 5 As shown, in order to prevent the damping particles 30 from becoming blocked during the use of the particle damper 1 and affecting the vibration reduction effect, the spacing between adjacent damping plates 22 is greater than 1.5 times the diameter of the damping particles 30.
[0073] In an alternative embodiment, such as Figure 3 and Figure 7 As shown, the substrate 21 is set at a 90-degree angle to the bottom plate of the housing 10 (that is, the normal of the substrate 21 and the normal of the bottom plate satisfy the perpendicular condition) so that the damping plate 22 is parallel to the bottom plate; preferably, multiple damping plates 22 are all vertically arranged on the substrate 21.
[0074] The base plate is the part used to install the object to be damped.
[0075] In the above technical solution, this arrangement ensures that the reaction force generated by the resonance of the damping object is perpendicular to the plane of the damping plate 22 of the damping structure 20, which is beneficial to improving the damping effect. It should be noted that the installation of the particle damper must ensure that the main vibration direction is perpendicular to the plane of the damping plate 22. In addition, the base plate includes a connecting ear plate, which has a third connecting hole. The third connecting hole can be used as a welding positioning point to connect the particle damper 1 to the object to be damped, or a bolt 40 can be used to pass through the third connecting hole and the object to be damped at the same time to fix the particle damper 1 to the object to be damped.
[0076] In an optional embodiment, the particle damper 1 is best installed at the point of maximum vibration of the object to be damped. Furthermore, for fixing the particle damper 1, for equipment with low installation precision requirements (i.e., the object to be damped), an elongated hole can be machined for installation, and the particle damper 1 can be initially fixed by fitting it into the mounting hole. For equipment with higher installation precision, the particle damper 1 can be connected to the equipment through positioning holes. To ensure the tightness of the particle damper 1 installation, it can be welded to the equipment after installation. After installing the particle damper 1, the vibration reduction effect (the vibration measurement value of the object to be damped before installation minus the vibration measurement value of the object to be damped after installation) and the improvement effect (the vibration measurement value of the object to be damped after installing a traditional particle damper minus the vibration measurement value of the object to be damped after installation) are calculated.
[0077] In an optional embodiment, the vibration of the damping structure 20 is dissipated through the collision and friction between the damping particles 30 while the vibration of the damping structure 20 is being absorbed, thus expanding the application scenarios of the particle damper 1. In addition, the particle damper 1 is connected to the object to be damped by bolts or welding. In order to obtain higher connection stability, the two can be combined.
[0078] In an optional embodiment, the modal frequency of the damping structure 20 is designed to match the modal frequency of the object to be damped, thereby absorbing and canceling the vibration energy of the system. This method can significantly reduce the vibration amplitude at the resonant frequency. Studies have shown that adding a damping layer to the damping structure 20 can effectively improve the energy dissipation effect of the tuned oscillator. In this invention, the continuous damping layer is replaced with discontinuous damping particles 30, which improves the damping energy dissipation effect of the tuned oscillator. At the same time, the damping structure 20, as a shell structure, increases the interaction area between the damping particles 30 and the shell 10, effectively transmitting the damping force.
[0079] A design method for a particle damper, the design method comprising:
[0080] S1. Obtain the mass of the object to be damped and the damping space for installing the particle damper 1. The particle damper 1 is the particle damper 1 mentioned above.
[0081] S2. Based on the mass, determine the mass of the particle damper 1 to be installed. Replace the particle damper 1 to be installed with an equivalent mass block or a traditional particle damper of equal weight. Install the equivalent mass block on the object to be damped and conduct experiments or simulations to obtain the first damping peak value. The first damping peak value is the damping peak value of the object to be damped after the equivalent mass block or a traditional particle damper of equal weight is installed on the object to be damped.
[0082] S3. Dimensions of the housing 10 of the particle damper 1 to be installed, based on the vibration reduction space design;
[0083] S4. Based on the dimensions of the housing 10, fabricate the housing 10 of the particle damper 1 to be installed, and the vibration reduction space should be able to accommodate at least one housing 10.
[0084] In step S4, it should be noted that multiple particle damper housings 10 can be designed according to the vibration reduction space. The dimensions of the multiple particle damper housings 10 may be the same or different. Housings 10 of different sizes and vibration reduction structures 20 of different structures can be freely combined. Then, the required particle damper 1 is designed according to steps S5-S8.
[0085] S5. Assemble the vibration damping structure 20 with the housing 10, and fill the housing 10 with damping particles 30 to form the particle damper 1 to be tested.
[0086] S6. Conduct experiments or simulations on the particle damper 1 to be tested to obtain the modal frequencies of each damping plate 22 in the damping structure 20.
[0087] In step S6, it should be noted that the changes in the length and distribution of the multiple damping plates 22 follow a power-law exponential pattern. , m≥2, or satisfy an arithmetic sequence; to broaden its modal frequency range, wherein the size of the damping plate 22 has a vibration suppression effect on a specific frequency band.
[0088] S7. If the modal frequency of at least one of the damping plates 22 is equal to the first damping peak value, then the corresponding damping structure 20 is taken as the optimal damping structure 20; if the modal frequencies of each of the damping plates 22 are not equal to the first damping peak value, then the structure of the damping structure 20 is adjusted until the modal frequency of at least one of the damping plates 22 is equal to the first damping peak value, and then the damping structure 20 corresponding to the adjustment where the modal frequency of at least one of the damping plates 22 is equal to the first damping peak value is taken as the optimal damping structure 20.
[0089] In the above design method, the optimal vibration damping structure 20 includes: determining the modal frequencies of the damping plate 22 through the above design method; taking the damping plate 22 whose modal frequency equals the first vibration damping peak as the optimal damping plate 22; taking the modal frequency corresponding to the optimal damping plate 22 as the first modal frequency X1; obtaining the corresponding first vibration damping peak as Y1; then the amplitudes corresponding to the damping plates 22 at both ends are the second vibration damping peak Y2 and the third vibration damping peak Y3, respectively; obtaining the corresponding modal frequencies based on the second vibration damping peak Y2 and the third vibration damping peak Y3, respectively, as the second modal frequency X2 and the third modal frequency X3; the damping plates 22 at both ends are the longest damping plate 22 and the shortest damping plate 22 of the vibration damping structure 22, respectively; and then adding damping plates 22 (i.e., the shortest damping plate 22 and the optimal damping plate 22) within this frequency range (from the second modal frequency X2 to the third modal frequency X3). The dimensions of the remaining damping plates 22 are obtained by making the lengths or frequencies of the damping plates 22 equal (between the optimal damping plate 22 and the longest damping plate 22). Equal length distribution means that if there are n plates, the length distribution of the damping plates 22 satisfies an arithmetic sequence. The longest plate corresponding to the second modal frequency X2 has a length of l2, and the shortest plate corresponding to the third modal frequency X3 has a length of l3. The equal distance between the lengths of the damping plates 22 is (l2-l3) / (n-1). Equal frequency distribution means that if there are n plates, the frequency distribution of each damping plate 22 satisfies an arithmetic sequence. The equal distance between the frequencies of the damping plates 22 is (X3-X2) / (n-1). This allows the damping plates 22 to be arranged in order of height from longest to shortest or from shortest to longest. Furthermore, it should be noted that the longer the damping plate 22, the lower its modal frequency; conversely, the shorter the damping plate 22, the higher its modal frequency.
[0090] S8. Based on the dimensions of the housing 10 and the optimal vibration damping structure 20, fabricate the particle damper 1 to be installed.
[0091] The above design method allows for the design of specific vibration damping structures 20 for specific frequency ranges of the object to be damped, thereby further improving the vibration damping effect of the particle damper 1 on the specific frequency range of the object to be damped.
[0092] In one alternative technical solution, the design method also includes: conducting experiments or simulations on the particle damper to be tested (using simulation software for coupled finite element-discrete element simulation), and optimizing the material, particle size, and filling rate of the damping particles 30 as needed.
[0093] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.
[0094] The following is a further description of this solution with reference to specific embodiments:
[0095] In one specific embodiment, the particle damper 1 has six damping plates 22, which are, from bottom to top, a first damping plate, a second damping plate, a third damping plate, a fourth damping plate, a fifth damping plate, and a sixth damping plate, as shown below. Figure 3 and Figure 4 As shown, the first damping plate is the longest and the sixth damping plate is the shortest. It should be noted that the longer the damping plate is, the lower the modal frequency.
[0096] The first-order modal frequency of the damping plate 22 of the damping structure 20 was designed using finite element software, and the design results are shown in Table 1.
[0097] Table 1 Modal design frequencies of the damping plate
[0098] structure First damping plate Second damping plate Third vibration damping plate Fourth damping plate Fifth damping plate Sixth vibration damping plate Modal frequency 61.4 73.2 88.6 109.3 139.7 157.1
[0099] like Figure 11 As shown in the experimental setup 60, a conventional particle damper and a custom particle damper 1 (with an embedded tuned vibration reduction structure 20, but without damping particles 30) are respectively installed on the upper surface 61 of the rectangular frame. An exciter 62 is installed inside the rectangular frame to measure the vibration response at the installation location. The measurement results are as follows: Figure 12 As shown;
[0100] from Figure 12 As can be seen, the vibration damping structure 20 resonated at multiple frequencies. Figure 12 The results show a split peak phenomenon, which is basically consistent with the results obtained from modal flanks.
[0101] The vibration reduction effect under large vibration levels after installing this particle damper (embedded tuned damping structure 20, filled with damping particles 30) is as follows: Figure 13 As shown, the vibration reduction effect under micro-vibration is as follows: Figure 14 As shown.
[0102] from Figure 13 and Figure 14As can be seen, after adding the damping structure 20, a wider damping bandgap is generated within the modal range of this particle damper 1, improving the damping effect under large vibration levels and micro vibrations. The particle damper mainly draws on the local resonance mechanism and the bandgap effect formed by periodic arrangement to broaden the local damping frequency band; at the same time, by discretizing the damping structure 20, the collision and friction between the damping structure 20 and the damping particles 30 are increased, allowing more energy to be dissipated.
[0103] The advantages of this particulate damper are as follows:
[0104] First, it can effectively increase the vibration reduction effect of particulate dampers in the design frequency band;
[0105] Second, the design of the vibration damping structure inside the shell of the particle damper did not change the shape and installation structure of the particle damper.
[0106] III. Improve vibration reduction effect in micro-vibration environments.
[0107] Fourth, the embedded tuning and vibration reduction structure is simple and has a low processing cost.
[0108] Fifth, it can reduce the number of particulate dampers required and lower installation costs.
[0109] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0110] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A particle damper, characterized in that, The particulate damper (1) includes: The housing (10) has a portion for mounting the object to be damped; The vibration damping structure (20) includes: a base plate (21) and a plurality of damping plates (22), the plurality of damping plates (22) being arranged parallel and spaced apart on the base plate (21); the plurality of damping plates are assembled into the housing (10) through the base plate (21); Damping particles (30); the damping particles (30) are filled inside the housing (10).
2. The particle damper according to claim 1, characterized in that, The length of the ends of the plurality of damping plates (22) away from the substrate (21) gradually increases in the vertical direction.
3. The particle damper according to claim 2, characterized in that, The number of vibration damping structures (20) is two, and the two vibration damping structures (20) are arranged symmetrically and at intervals along the length direction of the shell (10).
4. The particle damper according to claim 3, characterized in that, The length of the end of each of the damping plates (22) of each damping structure (20) away from the substrate (21) increases vertically from top to bottom according to a power law or an arithmetic sequence.
5. The particle damper according to claim 3, characterized in that, The length of the end of the plurality of damping plates (22) of the first damping structure (20) away from the substrate (21) increases vertically from bottom to top according to a power law exponential pattern or an arithmetic sequence. The length of the end of the plurality of damping plates (22) of the second damping structure (20) away from the substrate (21) increases vertically from top to bottom according to a power law exponential pattern or an arithmetic sequence.
6. The particle damper according to claim 1, characterized in that, The housing (10) includes: housing body (11) and upper cover plate (12); The top surface of the housing body (11) is an open top surface, and the upper cover plate (12) is used to cover the open top surface; at least one side of the housing body (11) is an open side surface, and the side of the base plate (21) connected to the vibration damping plate (22) is used to cover the open side surface.
7. The particle damper according to claim 6, characterized in that, The upper cover plate (12) is sealed to the top surface of the opening by bolts (40) to achieve a removable cover.
8. The particle damper according to claim 6, characterized in that, The substrate (21) is covered by the side of the opening by the connecting plate (50), and the substrate (21) and the connecting plate (50) are detachably connected.
9. The particle damper according to claim 1, characterized in that, The length direction of the damping plate (22) is parallel to the length direction of the housing (10), and the width direction of the damping plate (22) is parallel to the width direction of the housing (10). The length direction is from one end of the damping plate (22) disposed on the substrate (21) to the end of the damping plate (22) away from the substrate (21). The width of the housing (10) is greater than the width of the damping plate (22); the damping plate (22) is centrally arranged such that there is a first gap between the long edge of the damping plate (22) and the housing (10), the first gap being greater than 1.5 times the diameter of the damping particle (30).
10. The particle damper according to claim 1, characterized in that, The spacing between adjacent damping plates (22) is greater than 1.5 times the diameter of the damping particles (30).
11. The particle damper according to claim 1, characterized in that, The substrate (21) is set at a 90-degree angle to the bottom plate of the housing (10) so that the damping plate (22) is parallel to the bottom plate; The base plate is the part used to install the object to be damped.
12. A design method for a particle damper, characterized in that, The design method includes: Obtain the mass of the object to be damped and the damping space of the object to be damped for installing the particle damper (1), wherein the particle damper (1) is the particle damper (1) according to any one of claims 1-11. Based on the mass, the mass of the particle damper (1) to be installed is obtained. The particle damper (1) to be installed is replaced by an equivalent mass block or a traditional particle damper of equal weight. The equivalent mass block or the traditional particle damper of equal weight is installed on the object to be damped. Experiments or simulations are conducted to obtain the first damping peak value. The first damping peak value is the damping peak value of the object to be damped after the equivalent mass block is installed on the object to be damped. The dimensions of the housing (10) of the particle damper (1) to be installed are designed based on the vibration reduction space. Based on the dimensions of the housing (10), the housing (10) of the particle damper (1) to be installed is manufactured, and the vibration reduction space is capable of accommodating at least one housing (10). The vibration damping structure (20) is assembled with the housing (10), and damping particles (30) are filled into the housing (10) to form a particle damper (1) to be tested. Experiments or simulations were conducted on the particle damper (1) to be tested to obtain the modal frequencies of each damping plate (22) in the damping structure (20); If the modal frequency of at least one of the damping plates (22) is equal to the first damping peak value, then the corresponding damping structure (20) is taken as the optimal damping structure (20); if the modal frequencies of each of the damping plates (22) are not equal to the first damping peak value, then the structure of the damping structure (20) is adjusted until the modal frequency of at least one of the damping plates (22) is equal to the first damping peak value, and then the damping structure (20) corresponding to the adjusted modal frequency of at least one of the damping plates (22) is taken as the optimal damping structure (20). Based on the dimensions of the housing (10) and the optimal vibration damping structure (20), the particle damper (1) to be installed is fabricated.