CN110792184A - High damping sheet based on particle damping - Google Patents
High damping sheet based on particle damping Download PDFInfo
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- CN110792184A CN110792184A CN201910976483.1A CN201910976483A CN110792184A CN 110792184 A CN110792184 A CN 110792184A CN 201910976483 A CN201910976483 A CN 201910976483A CN 110792184 A CN110792184 A CN 110792184A
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- damping
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/01—Vibration-dampers; Shock-absorbers using friction between loose particles, e.g. sand
- F16F7/015—Vibration-dampers; Shock-absorbers using friction between loose particles, e.g. sand the particles being spherical, cylindrical or the like
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/165—Particles in a matrix
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
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Abstract
The invention provides a high-damping sheet based on particle damping, which relates to the technical field of vibration reduction and noise reduction, and comprises: the particle damper comprises a containing shell fixed on the cantilever and particles arranged in the containing shell. The invention reduces the generation of local modes of the thin plate caused by uneven structural rigidity and improves the shock absorption and sound insulation effects of the thin plate.
Description
Technical Field
The invention relates to the technical field of vibration and noise reduction, in particular to a particle damping-based high-damping thin plate.
Background
In the fields of building and military industry, most of product performances are closely related to vibration reduction technology, and the research on how to effectively control vibration is very important in industry, wherein the vibration and noise characteristics of a plate structure have very important influence on the structural dynamic characteristics of the whole mechanical product. With the development of science and technology, more and more attention is paid to vibration and noise generated by a panel structure when the panel structure is excited by external excitation and the mutual coupling relationship between the vibration and the noise, the basic characteristics of the vibration of the panel structure relate to sound radiation and sound transmission, structural bending waves are important waveforms for promoting the sound radiation and the sound transmission through the structure, and the bending waves are mainly caused by the vibration of the panel, so that the radiation noise of the panel is reduced by controlling the vibration of the panel, which is a main means for reducing the vibration and the noise of the panel structure.
However, for thin plate structures such as structural floor slabs for buildings, aircraft wall panels, fan casings, and high-speed rail wall panels, structures such as ribs and cavities are often added due to the design requirements of the structures. The structure rigidity caused by the method is uneven, and local modes appear, so that the sound radiation capability of the thin plate is improved. At present, most of common wallboard structures are formed by aluminum alloy, stainless steel and other thin-plate low-damping alloys, and the damping capacity to vibration is small. At present, no proper method is available for avoiding the local mode of the wallboard, optimizing the dynamic characteristic of the wallboard and reducing the sound radiation of the wallboard.
Disclosure of Invention
The invention provides a high-damping thin plate based on particle damping, and aims to solve the problems of poor vibration damping effect and high sound radiation of the conventional thin plate structure.
The invention is realized by the following steps:
the invention provides a high damping sheet based on particle damping, which comprises: the particle damper comprises a containing shell fixed on the cantilever and particles arranged in the containing shell.
Further, in a preferred embodiment of the present invention, the particle damper is connected to the wall plate through a connecting structure, wherein the connecting structure is a cantilever beam, the particle damper is disposed on a cantilever of the cantilever beam, the cantilever beam is periodically provided with circular holes, and the circular holes on the two cantilevers are symmetrically arranged.
Further, in a preferred embodiment of the present invention, the particle damper mounting position includes at least one of:
a maximum bending displacement of the wall panel, a maximum modal sensitivity position of the wall panel, or between the wall panel nodal line and the maximum modal sensitivity position.
Further, in a preferred embodiment of the present invention, the damping effect of the high damping sheet is as follows:
wherein, CeqFor damping effect, a, b are the spacing between the circular holes, W1And W2The maximum and minimum widths of the cantilever arms, d the diameter of the circular hole, h the diameter of the particle damper, E the elastic modulus of the cantilever beam, L the arm length of the cantilever beam, m the mass of the particle, and ρmIs the equivalent density of the particles and is,
the vibration velocity of the cantilever is, f is the vibration frequency of the wall plate, and α is constant.
Further, in a preferred embodiment of the present invention, the wall plate is provided with a damping cavity, and the particle damper is encapsulated in the damping cavity.
Further, in a preferred embodiment of the present invention, the particle damper is fixed to a surface of the wall plate.
Further, in a preferred embodiment of the present invention, the particles are metal, nonmetal or polymer composite materials, and the particles are one or more of spheres with a diameter of 0.001-20mm, ellipsoids with a length of a major axis and a minor axis of 0.001-20mm, and regular or irregular polyhedrons with a side length of 0.001-20 mm.
Further, in a preferred embodiment of the present invention, the wall thickness of the accommodating shell is 0.01-20mm, and the material of the accommodating shell or the connecting structure is selected from a binary or multi-element alloy formed by combining one or more of magnesium alloy, aluminum alloy, titanium alloy, iron alloy, copper alloy, nickel alloy, lead alloy, manganese alloy, cobalt alloy or tungsten alloy.
Further, in a preferred embodiment of the present invention, the surface of the particle is configured as: the surface friction factor is 0.01-0.99, the surface recovery coefficient is 0.01-1, and the density of the particles is 0.1-30g/cm 3.
Further, in the preferred embodiment of the present invention, the filling rate of the particles in the damper is 10% -100%.
The invention has the beneficial effects that:
according to the high-damping thin plate based on particle damping, which is obtained through the design, when the thin plate structure with the local mode vibrates, the rheological property of the damping material in the particle damper can be caused, and the target effect is formed, so that the energy is dissipated, the vibration of the local mode position of the thin plate is reduced, the generation of bending waves of the thin plate is inhibited, and the sound insulation effect of the thin plate is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a high damping sheet based on particle damping provided in embodiment 1 of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic view of a sheet structure provided in example 1 of the present invention;
FIG. 4 is a schematic structural view of a connecting structure in embodiment 1 of the invention;
fig. 5 is a graph of the vibration damping effect of the particle damping-based high-damping thin plate in the first-order vibration mode according to embodiment 1 of the present invention;
fig. 6 is a graph illustrating a damping effect of the particle damping-based high damping thin plate in a second-order vibration mode according to embodiment 1 of the present invention;
FIG. 7 is a schematic structural diagram of a particle-damping-based high-damping thin plate provided in example 2 of the present invention;
fig. 8 is a schematic structural diagram of a particle damping-based high damping thin plate provided in embodiment 3 of the present invention.
Icon: 1-a wall plate; 2-a particle damper; 21-a containment case; 22-particles; 3-a connecting structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
Referring to fig. 1, the present invention provides a high damping sheet based on particle damping, including: a wall plate 1, a particle damper 2 and a connecting structure 3 connecting the wall plate 1 and the particle damper 2. The connecting structure 3 is a cantilever beam, the particle damper 2 is arranged on a cantilever of the cantilever beam, round holes are periodically formed in the cantilever beam, and the round holes are symmetrically arranged on the two cantilevers.
In the vibration process, the connecting structure 3 is forced to vibrate to cause the particle damper 2 on the cantilever to vibrate passively, the degree of freedom is larger, and the vibration reduction effect is better. Meanwhile, damping holes do not need to be formed in the material of the wall plate 1, so that the generation of local modes caused by uneven structural rigidity is reduced, and the sound radiation of the wall plate 1 is reduced. Meanwhile, the holes are formed in the cross arm type cantilever beams, so that the rigidity of the cantilever is reduced, the vibration freedom degree of the particle damper in the vibration process is increased, and the damping effect is better.
Further, referring to fig. 4, the damping effect of the high damping sheet is as follows:
wherein, CeqFor damping effect, a, b are the spacing between the circular holes, W1And W2The maximum and minimum widths of the cantilever arms, d the diameter of the circular hole, h the diameter of the particle damper, E the elastic modulus of the cantilever beam, L the arm length of the cantilever beam, m the mass of the particle, and ρmIs the equivalent density of the particles and is,
the damping effect of the connecting structure 3 is closely related to the structural size of the cantilever arm, the size and the distance of the round holes and the physical property parameters of the particle damping box, so that guidance is provided for the research of the damping mechanism and the design and optimization of the damping device, and the damping device has a large practical application value.
In this embodiment, the connection structure 3 and the wall plate 1 may be connected by an adhesive connection, a threaded connection, a key connection, a profile connection, an expansion connection, a pin connection, a riveting connection, a welding connection, an adhesive connection, or an interference connection, which is not limited in this embodiment. The rigidity of the connecting part is greater than that of the thin plate structure, so that the structural stability of the connecting structure 3 and the thin plate body is guaranteed.
Further, referring to fig. 1-3, the particle damper 2 mounting location includes at least one of:
maximum bending displacement of panel 1, maximum modal sensitivity position of panel 1 or between the panel 1 nodal line and maximum modal sensitivity position. Wherein the modal sensitivity refers to the change rate of the free vibration frequency of the thin plate along with the structural parameters; the panel pitch line is a line where the panel deflection is zero, i.e., a line where the panel 1 remains stationary during vibration, and on the pitch line, the modal position of the panel 1 remains changed. In the above position, the particle damper 2 has a large amplitude, the particle 22 collides more intensely, and the momentum exchange and energy consumption are the highest, thereby having a better vibration damping effect.
Further, the particle damper 2 includes a housing case 21 fixed to the cantilever and particles 22 built in the housing case 21. Preferably, the housing case 21 is configured as a cylinder or a polyhedron. When the sheet vibrates, vibration energy is dissipated by interaction between the particles 22 in the particle damper 2 and interaction between the particles 22 and the containing shell 21, so that generation of bending waves of the sheet is suppressed, and the sound insulation effect of the sheet is improved.
Further, the particles 22 are one or more of spheres with a diameter of 0.001-20mm, ellipsoids with a length of a major axis and a minor axis of 0.001-20mm, and regular or irregular polyhedrons with a side length of 0.001-20 mm. Preferably, the particles 22 are spherical and have a diameter of 0.1 to 5 mm. The sphere structure has larger freedom of movement, and the collision probability among the particles 22 is high, so that the damping is increased, and the vibration resistance is better.
Further, the particles 22 are metal, non-metal, or polymer composite materials. Preferably, the particles 22 are metal, and more preferably, the particles 22 are alloy materials, such as copper-zinc-aluminum, iron-chromium-molybdenum, and manganese-copper alloys, having a wide temperature and frequency range of applicability.
Further, the wall thickness of the accommodating shell 21 is 0.01-20mm, and the material of the accommodating shell 21 or the connecting structure 3 is selected from a binary or multi-element alloy formed by combining one or more of magnesium alloy, aluminum alloy, titanium alloy, iron alloy, copper alloy, nickel alloy, lead alloy, manganese alloy, cobalt alloy or tungsten alloy. Preferably, the material is square steel, the square steel has good integral rigidity, good material plasticity and toughness, can have large deformation, can well bear dynamic load and has strong deformation resistance, can be used for building large-span, ultrahigh and ultra-heavy buildings, has good homogeneity and isotropy, and best meets the basic assumption of general engineering mechanics.
Further, the surface of the particles 22 is configured to: surface friction factor of 0.01-0.99, surface recovery coefficient of 0.01-1, and density of the particles 22 of 0.1-30g/cm3. More preferably, the surface friction factor is 0.5 to 0.99, the surface recovery coefficient is 0.5 to 1, and the density of the particles 2 is 10 to 30g/cm3。
Further, the particle filling rate in the particle damper 2 is 10% -100%. Preferably, the filling rate is 50 to 80%, and more preferably, the damping effect is the best when the filling rate is 70 to 80%. At this time, the density of the particles is high, and the impact force of the collision is high, and meanwhile, a certain movement space ensures sufficient collision and friction among the particles and between the particles and the accommodating shell 21 so as to convert the kinetic energy of the system into heat energy for dissipation.
As shown in fig. 5, which is a graph showing the vibration damping effect of the high damping thin plate in the first-order vibration mode, the vibration of the wall plate mounted with the particle damping vibration absorber is greatly reduced compared to the conventional wall plate. Fig. 6 is a graph showing the vibration damping effect of the high damping thin plate in the second order vibration mode, and it can be seen from fig. 6 that the vibration is reduced by 18dB in the first order and 5dB in the second order. It can also be seen that the high damping sheet also has a considerable bandwidth.
Example 2
The implementation principle and the generated technical effects of the high-damping sheet based on particle damping provided by the embodiment of the invention are the same as those of the embodiment 1, and for brief description, corresponding contents in the embodiment 1 can be referred to for the non-mentioned parts of the embodiment.
Referring to fig. 7, in the high-damping sheet based on particle damping provided by the present embodiment, the wall plate (1) is provided with a damping cavity, and the particle damper (2) is encapsulated in the damping cavity, so that the high-damping sheet has a simple structure, is convenient to assemble, and has a larger practical application range in engineering.
Example 3
The implementation principle and the generated technical effects of the high-damping sheet based on particle damping provided by the embodiment of the invention are the same as those of the embodiment 1, and for brief description, corresponding contents in the embodiment 1 can be referred to for the non-mentioned parts of the embodiment.
Referring to fig. 8, in the high damping sheet based on particle damping provided in this embodiment, the particle damper (2) is fixed to the surface of the wall plate (1). Optionally, the particle damper (2) can be fixed by adopting bonding, welding screw connection and other modes, and is directly fixed on the surface of the wallboard (1), so that the structure of the wallboard (1) is prevented from generating a larger local mode, and the structural stability is better.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high damping sheet based on particle damping, comprising: wall plate (1) and a particle damper (2) connected to the wall plate (1), wherein the particle damper (2) comprises a containment housing (21) and particles (22) embedded therein.
2. The particle damping-based high damping sheet according to claim 1, wherein the particle dampers (2) are connected to the wall plate (1) through a connecting structure (3), wherein the connecting structure (3) is a cantilever beam, the particle dampers (2) are arranged on cantilever arms of the cantilever beam, the cantilever beam is periodically provided with circular holes, and the circular holes on the two cantilever arms are symmetrically arranged.
3. The high-damping sheet based on particle damping as claimed in claim 2, wherein the particle damper (2) mounting position includes at least one of:
the maximum bending displacement of the wall plate (1), the maximum modal sensitivity position of the wall plate (1) or between the nodal line of the wall plate (1) and the maximum modal sensitivity position.
4. The high damping sheet based on particle damping according to claim 2, wherein the damping effect of the high damping sheet is as follows:
wherein, CeqFor damping effect, a, b are the spacing between the circular holes, W1And W2The maximum and minimum widths of the cantilever arms, d the diameter of the circular hole, h the diameter of the particle damper, E the elastic modulus of the cantilever beam, L the arm length of the cantilever beam, m the mass of the particle, and ρmIs the equivalent density of the particles and is,
the vibration velocity of the cantilever is, f is the vibration frequency of the wall plate, and α is constant.
5. The particle damping-based high-damping thin plate as claimed in claim 1, wherein a damping cavity is opened on the wall plate (1), and the particle damper (2) is encapsulated in the damping cavity.
6. The high damping sheet based on particle damping as claimed in claim 1, wherein the particle damper (2) is fixed to the surface of the wall plate (1).
7. The particle damping-based high damping sheet according to claim 1, wherein the particles (22) are particles (22) of metal, nonmetal or polymer composite, and the particles are one or more of spheres with a diameter of 0.001-20mm, ellipsoids with a length of long and short axes of 0.001-20mm, regular or irregular polyhedrons with a side length of 0.001-20 mm.
8. The high damping sheet based on particle damping as claimed in claim 1, wherein the wall thickness of the containing shell (21) is 0.01-20mm, and the material of the containing shell (21) or the connecting structure (3) is selected from a binary or multi-element alloy formed by combining one or more of magnesium alloy, aluminum alloy, titanium alloy, iron alloy, copper alloy, nickel alloy, lead alloy, manganese alloy, cobalt alloy or tungsten alloy.
9. The high damping sheet based on particle damping of claim 1, wherein the surface of the particles (22) is configured to: the surface friction factor is 0.01-0.99, the surface recovery coefficient is 0.01-1, and the density of the particles (22) is 0.1-30g/cm 3.
10. The high damping sheet based on particle damping as claimed in claim 1, wherein the particle damper (2) has a particle (22) filling rate of 10-100%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976483.1A CN110792184A (en) | 2019-10-15 | 2019-10-15 | High damping sheet based on particle damping |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910976483.1A CN110792184A (en) | 2019-10-15 | 2019-10-15 | High damping sheet based on particle damping |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981666A (en) * | 2020-08-28 | 2020-11-24 | 厦门环寂高科有限公司 | Air conditioning unit based on particle damping and installation method thereof |
| CN113496055A (en) * | 2020-03-20 | 2021-10-12 | 中车唐山机车车辆有限公司 | Method for reducing vibration of end wall, high-damping end wall and device |
-
2019
- 2019-10-15 CN CN201910976483.1A patent/CN110792184A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113496055A (en) * | 2020-03-20 | 2021-10-12 | 中车唐山机车车辆有限公司 | Method for reducing vibration of end wall, high-damping end wall and device |
| CN113496055B (en) * | 2020-03-20 | 2023-09-26 | 中车唐山机车车辆有限公司 | Method for reducing vibration of end wall, high damping end wall and device |
| CN111981666A (en) * | 2020-08-28 | 2020-11-24 | 厦门环寂高科有限公司 | Air conditioning unit based on particle damping and installation method thereof |
| CN111981666B (en) * | 2020-08-28 | 2024-03-26 | 厦门环寂高科有限公司 | Air conditioning unit based on particle damping and installation method thereof |
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