CN110641082A

CN110641082A - Vibration-damping impact-reducing honeycomb damping plate and preparation method thereof

Info

Publication number: CN110641082A
Application number: CN201910890768.3A
Authority: CN
Inventors: 吉利; 罗元易; 肖望强
Original assignee: Xiamen Zhen Wei Technology Co Ltd
Current assignee: Xiamen Zhen Wei Technology Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-01-03

Abstract

The invention provides a vibration-damping impact-reducing honeycomb damping plate and a preparation method thereof, and relates to vibration damping and noise reduction in the fields of spaceflight and buildings. Wherein the honeycomb damping plate comprises: a honeycomb core having a plurality of cavities; the first panel and the second panel are used for sealing two end faces of the honeycomb core respectively; the first adhesive layer is arranged between the first panel and the honeycomb core, and the second adhesive layer is arranged between the second panel and the honeycomb core; at least one particle damping element mounted within the honeycomb core cavity. The particle damping element comprises a completely closed envelope and damping particles freely filled in said envelope. Through packing granule damping element in honeycomb sandwich structure, damping granule is restricted in the overclad, avoids adhesion and damping power and honeycomb core's direct collision, and effectively improves the damping effect under microgravity state, and the structure is firm.

Description

Vibration-damping impact-reducing honeycomb damping plate and preparation method thereof

Technical Field

The invention relates to the technical field of aerospace vibration attenuation, in particular to a vibration-attenuation impact-reduction honeycomb damping plate and a preparation method thereof.

Background

The spacecraft structure in the future is required to be large-sized, light-weighted, low in vibration, low in noise, high in stability and the like, and vibration suppression is one of the key problems in spacecraft structure design. The resonance response and the local dynamic response of the primary and secondary structures of the spacecraft are overlarge, which can cause the failure of sensitive structures such as structural damage, local instability, electronic components and the like. The best processing mode of the vibration reduction of the spacecraft is to change the damping of the structure to achieve the peak eliminating effect, and the damping structure is added at a certain position, so that the damping of a local structure is suddenly increased, and the response of the structure is reduced.

The inventor researches and discovers that the honeycomb sandwich structure has high specific strength, high specific stiffness and light weight, has good vibration and noise reduction functions, and has great installation advantages when the honeycomb sandwich plate and particle damping are compositely applied to an aircraft. However, in the actual use process, the honeycomb sandwich structure needs to be attached by hot pressing with an adhesive, and the particulate material directly filled in the honeycomb structure is directly adhered to the honeycomb cavity under the action of the adhesive, so that the damping effect is reduced. Furthermore, particle damping fails in the microgravity environment of aircraft use.

Disclosure of Invention

The invention provides a vibration-damping impact-reducing honeycomb damping plate, aiming at solving the problem of damping failure of the damping plate under microgravity.

The invention also provides a preparation method of the vibration-damping impact-reducing honeycomb damping plate, which is simple and suitable for industrial large-scale production.

The invention is realized by the following steps:

a vibration and shock reducing honeycomb damping plate comprising:

a honeycomb core having a plurality of cavities;

the first panel and the second panel are used for closing two end faces of the honeycomb core respectively;

a first adhesive layer disposed between the first panel and the honeycomb core and a second adhesive layer disposed between the second panel and the honeycomb core;

at least one particle damping element mounted within the honeycomb core cavity, the particle damping element comprising a fully enclosed outer cladding and damping particles freely filled within the outer cladding.

Further, in a preferred embodiment of the present invention, the filling rate of the damping particles in the outer layer is 30% to 100%.

Further, in a preferred embodiment of the present invention, the outer cladding of the particle damping element is partially or completely fixed to the contact position of the first adhesive layer and the second adhesive layer.

Further, in a preferred embodiment of the present invention, the outer covering layer includes a rigid outer shell and/or a flexible outer shell, the rigid outer shell is made of a high temperature resistant metal or a high temperature resistant hard polymer material, the flexible outer shell is made of a soft polymer film or a cloth material, the wall thickness of the outer covering layer is 0.1-2 mm, and the height of the particle damping element is 3-500 mm.

Further, in a preferred embodiment of the invention, the envelope comprises a first rigid envelope structure and a plurality of flexible second envelope structures freely filled within the first envelope structure, the damping particles being freely filled within the second envelope structures.

Further, in a preferred embodiment of the present invention, the honeycomb core is filled with a plurality of the particle damping elements, the plurality of the particle damping elements are in a regular polygonal array, and two adjacent particle damping elements are separated by at least one of the cavities.

Further, in a preferred embodiment of the present invention, the first panel and the second panel are made of aluminum alloy or carbon fiber composite material, and the thickness is 0.1 to 1 mm.

Further, in a preferred embodiment of the present invention, the cross section of the cavity of the honeycomb core is a regular polygon or a circle, the wall thickness is 0.03 to 0.1mm, the side length of the cavity of the regular polygon cavity is 2 to 10mm, and the diameter of the circular cavity is 4 to 30 mm.

Further, in a preferred embodiment of the present invention, the particle damping element resonates with a vibration wave of the structure to be damped to form a resonant unit having a frequency band characteristic.

The invention also provides a preparation method of the vibration-damping impact-reducing honeycomb damping plate, which comprises the following steps:

and after the first adhesive layer is formed on the first panel, placing the first panel in a mold.

Placing the honeycomb core on the first adhesive layer, and fixing the honeycomb core and the first panel by hot pressing;

pre-burying the particle damping element into a cavity of the honeycomb core to which the first panel is fixed;

and after a second adhesive layer is formed on the second panel, the second adhesive layer is fixed with the honeycomb core filled with the particle damping elements in a hot-pressing mode.

The invention has the beneficial effects that:

the honeycomb sandwich plate has light weight and good vibration and noise reduction effects, and meanwhile, the honeycomb sandwich structure is naturally suitable for installation of the particle damping elements, and the damping particle elements can be directly filled in the cavity of the honeycomb core without excessively increasing the mass of the damping plate.

Damping particles in the particle damping element are freely filled in the sealed outer cladding layer, and the particles are not in direct contact with the honeycomb core, so that on one hand, the damping particles are guaranteed to be free, the damping failure caused by the adhesion of the damping particles is avoided, and on the other hand, the honeycomb core deformation failure caused by the fact that the damping particles directly impact the thin-wall structure of the honeycomb core is avoided. More importantly, the structure of the honeycomb damping plate can ensure that the honeycomb damping plate has a good vibration damping effect in a microgravity environment.

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 view of a honeycomb damping plate of embodiment 1 of the invention;

FIG. 2 is a schematic structural view of a particle damping element of example 1 of the present invention;

FIG. 3 is a schematic structural view of a honeycomb core filled with a particle damping element according to example 1 of the present invention;

FIG. 4 is a schematic structural view of a honeycomb core filled with a particle damping element according to example 2 of the present invention;

FIG. 5 is a schematic structural view of a particle damping member (outer cladding of a single layer) according to example 2 of the present invention;

FIG. 6 is a schematic structural view of a particle damping member (double-layered outer cladding) according to example 2 of the present invention;

FIG. 7 is a schematic structural view of a particle damping element of embodiment 3 of the present invention.

Icon: 100-honeycomb damping plates; 11-a first panel; 12-a second panel; 20-a honeycomb core; 21-a first adhesive layer; 22-a second adhesive layer; 30-a particle damping element; 31-an outer cladding; 32-damping particles; 40-a particle damping element; 41-an outer cladding; 42-damping particles; 50-a particle damping element; 501-a first outsourcing structure; 502-a second envelope structure; 503-damping particles.

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 embodiment provides a vibration and impact reduction honeycomb damping plate 100, which comprises a honeycomb core 20, a first panel 11 that is sealed by a first adhesive layer 21 on one end surface of the honeycomb core 20, a second panel 12 that is sealed by a second adhesive layer 22 on the other end surface of the honeycomb core 20, and a particle damping element 30 disposed in a cavity of the honeycomb core 20.

Further, in a preferred embodiment, the first panel 11 and the second panel 12 are made of aluminum alloy or carbon fiber composite material, and have a thickness of 0.1 to 1 mm. It is understood that the carbon fiber composite material can be, for example, an existing carbon fiber/ceramic composite material or a carbon fiber/resin composite material, and has good high temperature resistance and strong rigidity. It is understood that the materials of the first panel 11 and the second panel 12 may be the same or different.

Referring to fig. 2 and 3, further, in a preferred embodiment, the honeycomb core 20 has a plurality of cavities, the cross section of the cavity is regular polygon or circular, and the wall thickness is 0.03-0.1 mm, and more preferably, the wall thickness is 0.04-0.08 mm. In one embodiment, the cross section of the cavity of the honeycomb core 20 is a regular polygon, and the side length of the regular polygon is 2-10 mm. In another embodiment, the cross section of the cavity of the honeycomb core 20 is circular, and the diameter of the cavity is 4-30 mm. The honeycomb core 20 with the thin-wall structure has lighter weight, and on the basis of ensuring the connection rigidity, the obvious impact reduction effect can be obtained by adopting smaller additional mass.

Further, in the preferred embodiment, the honeycomb core 20 is made of aluminum, steel, copper or aluminum alloy, copper alloy, etc., and may be obtained by casting or stamping.

In the preferred embodiment, the first adhesive layer 21 is formed on the surface of the first panel 11 adjacent to the honeycomb core 20, and the second adhesive layer 22 is formed on the surface of the second panel 12 adjacent to the honeycomb core 20. The first adhesive layer 21 and the second adhesive layer 22 may be, for example, an epoxy adhesive film or an acrylate adhesive film, but are not limited thereto.

The particle damping element 30 comprises a completely closed outer cladding 31 and damping particles 32 freely filled in the outer cladding 31. The outer cladding 31 of the particle damping element 30 is shaped to substantially fit the cavity of the honeycomb core 20. For example, when the cavity of the honeycomb core 20 is a cylinder, the cylindrical particle damping member 30 is adapted to the shape and size of the cavity and is filled in the cavity.

Further, in the preferred embodiment, the outer cladding 31 of the particle damping element 30 is fixed to the contact position of the first adhesive layer 21 and the second adhesive layer 22, so as to enhance the stability of the structure.

It should be noted that, in other embodiments, the contact position of the outer cover 31 with the first adhesive layer 21 and the second adhesive layer 22 may also be partially fixed, and the fixing position of the outer cover 31 and the adhesive layer is determined according to the gluing position.

Further, in a preferred embodiment, the filling rate of the damping particles 32 in the outer cladding 31 is 30% to 100%. The filling ratio is the ratio of the actual filling amount of the outer cladding 31 to the maximum filling amount. If the filling rate is too low, the damping effect is poor, and if the filling rate is too high, the weight increase is caused, and further preferably, the filling rate is 30% to 80%.

Further, in this embodiment, the outer cladding 31 is a rigid outer shell, and the material of the rigid outer shell is a high temperature resistant metal or a high temperature resistant hard polymer material, such as nickel-based alloy, chrome steel, and the like. Further preferably, the wall thickness of the outer cladding 31 is 0.1-2 mm, and more preferably, the wall thickness is 0.3-1.2 mm. It will be appreciated that the particle damping element 30 may be made by: the rigid shell with an opening is filled with damping particles 32, and the opening of the rigid shell is sealed by welding, bonding or other methods to form a completely sealed outer cladding 31.

Further, in the preferred embodiment, the damping particles 32 are one or more of spheres having a diameter of 0.001 to 20mm, ellipsoids having a length of major and minor axes of 0.001 to 20mm, regular or irregular polyhedrons having a side length of 0.001 to 20 mm. The surface friction factor of the damping particles 32 is 0.01 to 0.99, the surface recovery coefficient is 0.01 to 1, and the density is 0.1 to 30g/cm³. Preferably, the damping particles 32 are a mixture of particles having an ellipsoidal shape (major axis of 2 to 8mm and minor axis of 1 to 6mm) and a spherical shape (diameter of 0.1 to 3 mm). Further preferably, the mass ratio of the ellipsoid to the sphere in the particle mixture is 2-5: 1. By adopting the damping particles with two shapes, larger collision energy consumption can be generated among the damping particles 32, and the damping capacity is better. Compared with the same mass of spherical damping particles and ellipsoidal specific resistance particles, the damping plate containing the ellipsoidal damping particles and the spherical damping particles in the mass ratio of 2-5: 1 has the impact peak value reduced by 12% and 9% respectively under the same condition.

Further, the damping particles 32 may be made of metal, nonmetal, polymer composite material, etc., for example, the damping particles are made of steel material, engineering plastic material, alloy, etc.

Further, in a preferred embodiment, the height of the particle damping element 30 is 3 to 500mm, and more preferably 15 to 200 mm. The height of the particle damping element can be selected by the user according to the use requirements.

Further, in the preferred embodiment, the honeycomb core 20 is filled with a plurality of particle damping elements 30, the plurality of particle damping elements 30 are in a regular polygonal array, and two adjacent particle damping elements 30 are separated by at least one cavity.

As shown in FIG. 3, in one embodiment, a plurality of particle damping elements 30 are arranged in a generally square array. The distance D between the center points of two adjacent particle damping elements 30 is several times the length D of the center line of the cavity, i.e., D ═ n × D, n is a positive integer greater than or equal to 1. In a preferred embodiment, n is 2 to 4, i.e. 1 to 3 cavities are formed between two adjacent particle damping elements 30. With the reference value of the impact peak value measured in the structure where n is 1 (i.e., each cavity of the honeycomb core is filled with the particle damping elements 30), when n is 2 and 3, the measured impact peak value is decreased by 31% and 33%, respectively, and when n is 4 and 6, the measured impact peak value is increased by 6% and 19%, respectively.

The particle damping element obtained through the design can resonate with the vibration wave of the structure to be damped to form a resonant unit with frequency band characteristics. The resonance unit can generate a coupling effect with shock waves of a structure to be damped, so that the waves in a corresponding specific frequency range cannot pass through, and the damping performance is greatly improved.

The embodiment of the invention also provides a preparation method of the honeycomb damping plate, which comprises the following steps:

(1) after the first adhesive layer 21 is formed on the first panel 11, it is placed in a mold. The method for forming the adhesive layer can be as follows: cutting the adhesive film according to the design size, ensuring that the edge of the adhesive film is slightly larger than the edge of the first panel by 1-4 mm, and covering the adhesive film on the first panel 11.

(2) The honeycomb core 20 is placed on the first adhesive layer 21, and the honeycomb core 20 and the first panel 11 are fixed by heat pressing. Preferably, in the step, the hot pressing and fixing conditions are that 8-10 MPa pressure is applied for 10-15 min at the temperature of 60-70 ℃, and the honeycomb core 20 with one closed surface is obtained.

(3) The particle damping element 30 is pre-buried into the cavity of the honeycomb core 20 to which the first face sheet 11 is fixed.

(4) After the second adhesive layer 22 is formed on the second panel 12, it is thermally pressed and fixed to the honeycomb core 20 filled with the particle damping element 30. The adhesive film is also cut and covered to form an adhesive layer on the surface of the second panel 12. Preferably, in the step, the parameters of hot pressing and fixing are that under the condition of 70-90 ℃, 12-15 MPa of pressure is applied for pressing for 16-20 min, and the honeycomb core 20 with two closed surfaces is obtained.

After the honeycomb damping plate 100 obtained by the above preparation method is formed, the outer cladding 31 of the particle damping element 30 is fixed relative to the honeycomb core 20, and the damping particles 32 in the outer cladding 31 move freely and do not collide with the honeycomb core directly. Compared with the honeycomb damping plate without the outer cladding 31, the honeycomb damping plate 100 manufactured by the embodiment has the advantages that the impact peak value is reduced by about 68%, the impact-resistant duration is improved by more than 5 times under the same vibration frequency, and the service life of the product is greatly prolonged.

Example 2

Referring to fig. 4-6, the cellular damping plate provided in the embodiment of the present invention has the same implementation principle and the same technical effects as those of embodiment 1, and for the sake of brief description, the embodiment can refer to the corresponding contents in embodiment 1.

The outer envelope 41 of the particle damping element 40 is a flexible outer shell. The flexible shell is made of soft polymer film or cloth. Such as, but not limited to, polyester film and the like. It will be appreciated that the particle damping element 40 may be made by: the flexible enclosure having the opening is filled with damping particles 42, and the opening of the flexible enclosure is closed by means of a heat-sealing process or the like to form a completely sealed envelope 41.

Preferably, in the present embodiment, the outer cladding 41 has a single-layer structure or a double-layer structure. The outer cladding 41 with the double-layer structure can form a particle damping group with the damping particles 42 inside to form a bag damping effect, and the damping performance of the product is further improved.

Example 3

Referring to fig. 7, the cellular damping plate provided in the embodiment of the present invention has the same implementation principle and the same technical effects as those of embodiment 1, and for brief description, reference may be made to corresponding contents in embodiment 1 where this embodiment is not mentioned.

The envelope of the particle damping element 50 comprises a rigid first envelope structure 501 and a plurality of flexible second envelope structures 502 freely filled within the first envelope structure 501, damping particles 503 being freely filled within the second envelope structures 502. The first outer covering structure 501 may be made of a high temperature resistant metal or a high temperature resistant hard polymer material, and the second outer covering structure 502 may be made of a soft polymer film or a cloth material.

Preferably, in this embodiment, the first outer-wrapping structure 501 is filled with 6 to 12 second outer-wrapping structures 502, and the plurality of second outer-wrapping structures 502 are arranged in two rows.

Compared with the rigid outer cladding (the outer cladding is a single layer) in the embodiment 1 and the flexible outer cladding (the outer cladding is a single layer) in the embodiment 2, under the condition that the filling amount of the damping particles is the same, the particle damping element 50 of the embodiment is adopted to obtain a product, and the impact peak value is reduced by 9-14%.

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

1. A vibration-damping and impact-reducing honeycomb damping plate is characterized by comprising:

a honeycomb core having a plurality of cavities;

2. The vibration and impact reduction honeycomb damping plate according to claim 1, wherein the filling rate of the damping particles in the outer covering layer is 30-100%.

3. The vibration and shock reducing honeycomb damping plate as described in claim 1, wherein the outer cladding of the particle damping element is fixed to the contact position of the first adhesive layer and the second adhesive layer partially or completely.

4. The vibration-damping impact-reducing honeycomb damping plate as claimed in claim 1, wherein the outer cladding layer comprises a rigid outer shell and/or a flexible outer shell, the rigid outer shell is made of high temperature-resistant metal or high temperature-resistant hard polymer material, the flexible outer shell is made of soft polymer film material or cloth material, the wall thickness of the outer cladding layer is 0.1-2 mm, and the height of the particle damping element is 3-500 mm.

5. The vibration damping and shock reducing honeycomb damping plate as described in claim 1, wherein said overwrap comprises a first rigid overwrap structure and a plurality of flexible second overwrap structures freely packed within said first overwrap structure, said damping particles being freely packed within said second overwrap structures.

6. The vibration and shock reducing honeycomb damping plate according to claim 1, wherein a plurality of the particle damping elements are filled in the honeycomb core, the particle damping elements are in a regular polygonal array, and at least one cavity is formed between every two adjacent particle damping elements.

7. The vibration and impact reduction honeycomb damping plate according to claim 1, wherein the first face plate and the second face plate are made of aluminum alloy or carbon fiber composite material and have a thickness of 0.1-1 mm.

8. The vibration and impact reduction honeycomb damping plate as claimed in claim 1, wherein the cross section of the cavity of the honeycomb core is regular polygon or circular, the wall thickness is 0.03-0.1 mm, the side length of the cavity of the regular polygon cavity is 2-10 mm, and the diameter of the circular cavity is 4-30 mm.

9. A vibration-damping shock-reducing cellular damping plate according to claim 1, characterized in that the particle damping element resonates with the vibration waves of the structure to be damped, forming a resonant unit with frequency band characteristics.

10. A preparation method of the vibration-damping impact-reducing honeycomb damping plate as defined in any one of claims 1 to 9, characterized by comprising the following steps:

after the first adhesive layer is formed on the first panel, placing the first panel in a mold;