A high damping thin plate based on particle damping

Abstract

The present invention provides a high damping thin plate based on particle damping, which relates to the technical field of vibration reduction and noise reduction. The high damping thin plate comprises: a wall plate and a particle damper connected to the wall plate, wherein the particle damper comprises a containing shell fixed on the cantilever and particles built into the containing shell. The present invention reduces the generation of local modes caused by uneven structural stiffness of the thin plate, and improves the vibration reduction and sound insulation effects of the thin plate.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction and noise reduction, and in particular to a high damping thin plate based on particle damping. Background Art

[0002] In the fields of construction and military industry, most product performance is closely related to vibration reduction technology. How to effectively conduct vibration control research is particularly important in industry. Among them, the vibration and noise characteristics of the plate structure have a very important impact on the structural dynamic characteristics of the entire mechanical product. With the development of science and technology, the vibration, noise and mutual coupling relationship between plate structures when subjected to external excitation are receiving more and more attention. The basic characteristics of plate structure vibration involve sound radiation and sound propagation. Structural bending waves are important waveforms that promote sound radiation and sound propagation through structures. Bending waves are mainly caused by the vibration of the plate. Therefore, reducing the radiation noise of the plate by controlling the vibration of the plate is the main means of reducing vibration and noise of the wall panel structure.

[0003] However, for thin plate structures such as building structural floors, aircraft wall panels, fan casings, and high-speed rail wall panels, ribs, cavities, and other structures are often added due to the design requirements of the structure. The resulting uneven structural stiffness causes local modes, which increases the sound radiation capacity of the thin plate. Currently, common wall panel structures are mostly composed of thin plate low-damping alloys such as aluminum alloy and stainless steel, which have low vibration attenuation capabilities. Currently, there is no suitable method to avoid local modes of wall panels, optimize the dynamic characteristics of wall panels, and reduce wall panel sound radiation. Summary of the invention

[0004] The invention provides a high damping thin plate based on particle damping, aiming to improve the problems of poor vibration reduction effect and high sound radiation of the existing thin plate structure.

[0005] The present invention is achieved in that:

[0006] The present invention provides a high damping thin plate based on particle damping, comprising: a wall plate and a particle damper connected to the wall plate, wherein the particle damper comprises a containing shell fixed on the cantilever and particles built into the containing shell.

[0007] Furthermore, in a preferred embodiment of the present invention, the particle damper is connected to the wall panel via a connecting structure, wherein the connecting structure is configured as a cantilever beam, the particle damper is arranged on the cantilever of the cantilever beam, circular holes are periodically opened on the cantilever beam, and the circular holes on the two cantilevers are symmetrically arranged.

[0008] Furthermore, in a preferred embodiment of the present invention, the particle damper installation position includes at least one of the following:

[0009] The maximum bending displacement of the panel, the maximum modal sensitivity position of the panel, or between the panel node line and the maximum modal sensitivity position.

[0010] Furthermore, in a preferred embodiment of the present invention, the damping effect of the high damping thin plate is as follows:

[0011]

[0012]

[0013] Among them, C eq is the damping effect, a and b are the hole spacings, W1 and W2 are the maximum and minimum widths of the cantilever arm, d is the hole diameter, h is the particle damper diameter, E is the elastic modulus of the cantilever beam, L is the arm length of the cantilever beam, m is the mass of the particle, and ρ m is the equivalent density of the particle, is the vibration velocity of the cantilever, f is the vibration frequency of the wall panel, and α is a constant.

[0014] Furthermore, in a preferred embodiment of the present invention, a damping cavity is provided on the wall panel, and the particle damper is encapsulated in the damping cavity.

[0015] Furthermore, in a preferred embodiment of the present invention, the particle damper is fixed to the surface of the wall panel.

[0016] Furthermore, in a preferred embodiment of the present invention, the particles are metal, non-metal or polymer composite materials, and the particles are one or more of a sphere with a diameter of 0.001-20 mm, an ellipsoid with a major and minor axis length between 0.001-20 mm, and a regular or irregular polyhedron with a side length of 0.001-20 mm.

[0017] Furthermore, in a preferred embodiment of the present invention, the wall thickness of the containment shell is 0.01-20 mm, and the material of the containment shell or the connecting structure is selected from a binary or multi-component alloy composed of one or more combinations of magnesium alloy, aluminum alloy, titanium alloy, iron alloy, copper alloy, nickel alloy, lead alloy, manganese alloy, cobalt alloy or tungsten alloy.

[0018] Furthermore, in a preferred embodiment of the present invention, the surface configuration of the particles is as follows: the surface friction factor is 0.01-0.99, the surface recovery coefficient is 0.01-1, and the density of the particles is 0.1-30 g / cm3.

[0019] Furthermore, in a preferred embodiment of the present invention, the particle filling rate in the damper is 10%-100%.

[0020] The beneficial effects of the present invention are:

[0021] The high damping thin plate based on particle damping obtained by the above design of the present invention will cause the rheology of the damping material in the particle damper when the thin plate structure with local mode vibrates, forming a target effect, thereby dissipating energy, reducing the vibration of the local modal position of the thin plate, suppressing the generation of thin plate bending waves, and improving the sound insulation effect of the thin plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic structural diagram of a high damping thin plate based on particle damping provided in Example 1 of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 3 This is a schematic diagram of the thin plate structure provided in Example 1 of the present invention;

[0026] Figure 4 is a structural schematic diagram of the connection structure in Example 1 of the present invention;

[0027] Figure 5 This is a diagram showing the vibration reduction effect of a high damping thin plate based on particle damping provided in Example 1 of the present invention in a first-order vibration mode;

[0028] Figure 6 This is a diagram showing the vibration reduction effect of a high damping thin plate based on particle damping in a second-order vibration mode provided by Example 1 of the present invention;

[0029] Figure 7 is a schematic structural diagram of a high damping thin plate based on particle damping provided in Example 2 of the present invention;

[0030] Figure 8 It is a schematic structural diagram of a high damping thin plate based on particle damping provided in Example 3 of the present invention.

[0031] Icon: 1-wall panel; 2-particle damper; 21-containment shell; 22-particles; 3-connection structure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] Example 1

[0038] Reference Figure 1 As shown, the present invention provides a high damping thin plate based on particle damping, comprising: a wall plate 1, a particle damper 2, and a connection structure 3 connecting the wall plate 1 and the particle damper 2. The connection structure 3 is configured as a cantilever beam, the particle damper 2 is arranged on the 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.

[0039] During the vibration process, the connection structure 3 is forced to vibrate, causing the particle damper 2 on the cantilever to vibrate passively, with a greater degree of freedom and a better vibration reduction effect. At the same time, it is not necessary to open damping holes in the wall panel 1 material, which reduces the generation of local modes caused by uneven structural stiffness and reduces the sound radiation of the wall panel 1. At the same time, by opening a hole in the cantilever beam, the stiffness of the cantilever is reduced, so that the vibration freedom of the particle damper during the vibration process becomes larger and the damping effect is better.

[0040] Further, refer to Figure 4 As shown, the damping effect of the high damping thin plate is as follows:

[0041]

[0042]

[0043] Among them, C eq is the damping effect, a and b are the hole spacings, W1 and W2 are the maximum and minimum widths of the cantilever arm, d is the hole diameter, h is the particle damper diameter, E is the elastic modulus of the cantilever beam, L is the arm length of the cantilever beam, m is the mass of the particle, and ρ m is the equivalent density of the particle, is the vibration velocity of the cantilever, f is the vibration frequency of the wall plate, and α is a constant. Among them, the equivalent density is the ratio of the sum of the masses of the particles 22 in the particle damper 2 to the volume of the containing shell 21, the damping effect is dimensionless, and the units of each physical quantity are all in the international system of units. It can be seen from the above formula that the damping effect of the connecting structure 3 is closely related to the structural dimensions of the cantilever arm, the size and spacing of the circular holes, and the physical parameters of the particle damping box, thereby providing guidance for the study of the damping mechanism, the design and optimization of the damping device, and has great practical application value.

[0044] In this embodiment, the connection method between the connection structure 3 and the wall panel 1 can be adhesive connection, thread connection, key connection, profile connection, expansion connection, pin connection, riveting, welding, bonding or interference connection, etc., which is not specifically limited in the present invention. The rigidity of the connection part is greater than the rigidity of the thin plate structure to ensure the structural stability of the connection structure 3 and the thin plate body.

[0045] Further, refer to Figure 1-3 As shown, the particle damper 2 installation position includes at least one of the following:

[0046] The maximum bending displacement of the wall panel 1, the maximum modal sensitivity position of the wall panel 1, or between the node line of the wall panel 1 and the maximum modal sensitivity position. The modal sensitivity refers to the rate of change of the free vibration frequency of the thin plate with the structural parameters; the wall panel node line refers to the line where the wall panel disturbance is zero, that is, the line where the wall panel 1 remains stationary during vibration, and on the node line, the modal position of the wall panel 1 remains variable. At the above position, the amplitude of the particle damper 2 is larger, the collision of the particles 22 is more intense, the momentum exchange and energy consumption are the highest, and thus a better vibration reduction effect is achieved.

[0047] Further, the particle damper 2 includes a housing 21 fixed on the cantilever and particles 22 built into the housing 21. Preferably, the housing 21 is configured as a cylinder or a polyhedron. When the thin plate vibrates, the particles 22 in the particle damper 2 and the particles 22 and the housing 21 interact to dissipate vibration energy, thereby suppressing the generation of bending waves of the thin plate and improving the sound insulation effect of the thin plate.

[0048] Further, the particle 22 is one or more of a sphere with a diameter of 0.001-20 mm, an ellipsoid with a major and minor axis length between 0.001-20 mm, and a regular or irregular polyhedron with a side length of 0.001-20 mm. Preferably, the particle 22 is a sphere with a diameter of 0.1-5 mm. The spherical structure has a greater degree of freedom of movement, and the probability of collision between particles 22 is high, thereby increasing damping and having better anti-vibration ability.

[0049] 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, which have a wide temperature and frequency application range.

[0050] Further, the wall thickness of the housing 21 is 0.01-20 mm, and the material of the housing 21 or the connection structure 3 is selected from a binary or multi-element alloy composed of 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 preferably square steel, which has good overall rigidity, good material plasticity and toughness, can be deformed greatly, can well withstand dynamic loads and has strong deformation resistance, can be used to build large-span, ultra-high and ultra-heavy buildings, has good homogeneity and isotropy, and best conforms to the basic assumptions of general engineering mechanics.

[0051] Furthermore, the surface configuration of the particle 22 is as follows: the surface friction factor is 0.01-0.99, the surface recovery coefficient is 0.01-1, and the density of the particle 22 is 0.1-30 g / cm 3 More preferably, the surface friction factor is 0.5-0.99, the surface recovery coefficient is 0.5-1, and the density of the particle 2 is 10-30 g / cm 3 .

[0052] Furthermore, the particle filling rate in the particle damper 2 is 10%-100%. Preferably, the filling rate is 50-80%, and more preferably, the vibration reduction effect is best when the filling rate is 70-80%. At this time, the particle density is large, and there is a large collision impact force. At the same time, a certain activity space ensures sufficient collision and friction between particles and between particles and the containing shell 21, so as to convert the system kinetic energy into heat energy dissipation.

[0053] like Figure 5 The figure shows the vibration reduction effect of the high damping thin plate in the first-order vibration mode. Compared with the conventional wall panels, the vibration of the wall panels installed with particle damping absorbers is greatly reduced. Figure 6 This is the vibration reduction effect diagram of the high damping thin plate in the second-order vibration mode. Figure 6 It can be seen that the first order vibration is reduced by 18 dB and the vibration at the second order frequency is reduced by 5 dB. It can also be seen that the highly damped thin plate has a considerable bandwidth.

[0054] Example 2

[0055] The high damping thin plate based on particle damping provided in the embodiment of the present invention has the same implementation principle and technical effects as those in Example 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Example 1.

[0056] Reference Figure 7 As shown, the high damping thin plate based on particle damping provided in this embodiment has a damping cavity opened on the wall panel (1), and the particle damper (2) is encapsulated in the damping cavity. The structure is simple, easy to assemble, and has a wider range of practical applications in engineering.

[0057] Example 3

[0058] The high damping thin plate based on particle damping provided in the embodiment of the present invention has the same implementation principle and technical effects as those in Example 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Example 1.

[0059] Reference Figure 8 As shown, the high damping thin plate based on particle damping provided in this embodiment, the particle damper (2) is fixed to the surface of the wall panel (1). Optionally, the particle damper (2) can be fixed by bonding, welding, screw connection, etc., and directly fixed to the surface of the wall panel (1) to avoid the wall panel (1) structure from generating a larger local mode, and the structural stability is better.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high damping thin plate based on particle damping, characterized in that: include: A wall panel (1) and a particle damper (2) connected to the wall panel (1), wherein the particle damper (2) comprises a containing shell (21) and particles (22) built into the containing shell; the particle damper (2) is connected to the wall panel (1) via a connecting structure (3), wherein the connecting structure (3) is configured as a cantilever beam, the particle damper (2) is arranged 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; the filling rate of the particles (22) in the particle damper (2) is 10%-100%.

2. The high damping thin plate based on particle damping according to claim 1, characterized in that: The particle damper (2) is installed at least one of the following locations: The maximum bending displacement of the wall panel (1), the maximum modal sensitivity position of the wall panel (1), or between the node line of the wall panel (1) and the maximum modal sensitivity position.

3. The high damping thin plate based on particle damping according to claim 1, characterized in that: The damping effect of the high damping thin plate is as follows: ， 、 、 、 、 、 ； in, For the damping effect, , is the hole spacing, and are the maximum and minimum widths of the cantilever arm, is the diameter of the circular hole, is the particle damper diameter, is the elastic modulus of the cantilever beam, is the arm length of the cantilever beam, is the mass of the particle, is the equivalent density of the particle, is the vibration speed of the cantilever, is the vibration frequency of the wall panel, Is a constant.

4. The high damping thin plate based on particle damping according to claim 1, characterized in that: The wall panel (1) is provided with a damping cavity, and the particle damper (2) is encapsulated in the damping cavity.

5. The high damping thin plate based on particle damping according to claim 1, characterized in that: The particle damper (2) is fixed to the surface of the wall panel (1).

6. The high damping thin plate based on particle damping according to claim 1, characterized in that: The particles (22) are metal, non-metal or polymer composite materials, and are one or more of a sphere with a diameter of 0.001-20 mm, an ellipsoid with a major and minor axis length between 0.001-20 mm, and a regular or irregular polyhedron with a side length of 0.001-20 mm.

7. The high damping thin plate based on particle damping according to claim 1, characterized in that: The wall thickness of the containing shell (21) is 0.01-20 mm, and the material of the containing shell (21) or the connecting structure (3) is selected from a binary or multi-component alloy formed by one or more combinations of magnesium alloy, aluminum alloy, titanium alloy, iron alloy, copper alloy, nickel alloy, lead alloy, manganese alloy, cobalt alloy or tungsten alloy.

8. The high damping thin plate based on particle damping according to claim 1, characterized in that: The surface configuration of the particle (22) is as follows: the surface friction factor is 0.01-0.99, the surface recovery coefficient is 0.01-1, and the density of the particle (22) is 0.1-30 g / cm3.

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