CN109483981B

CN109483981B - Honeycomb sandwich plate with embedded multi-level structure

Info

Publication number: CN109483981B
Application number: CN201811398118.9A
Authority: CN
Inventors: 李吉祥; 张勇; 黄文臻; 何宁
Original assignee: Huaqiao University
Current assignee: Huaqiao University
Priority date: 2018-11-22
Filing date: 2018-11-22
Publication date: 2020-11-06
Anticipated expiration: 2038-11-22
Also published as: CN109483981A

Abstract

The invention provides a honeycomb sandwich plate embedded with a multi-level structure, wherein the sandwich plate is of a sandwich structure consisting of an upper panel, a lower panel and a middle honeycomb core; the honeycomb core is formed by combining a plurality of square corrugated pipe arrays; the corrugation of the corrugated pipe is a sine curve; a hierarchical composite structure is embedded in the square corrugated pipe along the height direction, the first layer is an energy absorption plate from top to bottom, and the energy absorption plate is formed by arranging a plurality of energy absorption cells along the length direction of the square corrugated pipe; the second layer is a spiral pipe which is arranged along the height of the square corrugated pipe, and the upper end and the lower end of the spiral pipe respectively form a sandwich structure with the two polyester fiber plates; the third layer is of a lattice structure and is formed by arranging a plurality of lattice monomer arrays. Foretell embedded multilayer structure's honeycomb sandwich panel has solved the more serious problem of noise and vibration in the cabin at present, realizes the lightweight when aiming at absorbing noise and vibration in the cabin, improves passenger's travelling comfort under the prerequisite that satisfies the intensity requirement.

Description

Honeycomb sandwich plate with embedded multi-level structure

Technical Field

The invention relates to the field of composite materials, in particular to a honeycomb sandwich plate embedded with a multi-level structure.

Background

In recent years, with the improvement of living standard of people, tourism becomes a choice for people to have leisure and vacation, and people select airplanes as traveling tools also becomes a common phenomenon. However, since the aircraft is a closed space, noise and vibration in the cabin have certain influence on physical and mental health and flight experience of people, people hope to reduce the noise and vibration in the cabin of the aircraft, and therefore the noise and vibration in the cabin need to be absorbed as much as possible. The honeycomb structure is widely applied to the airplane in recent years, and is improved and designed on the basis of the fact that the honeycomb structure is applied to the wall of the cabin, so that the vibration and noise can be absorbed, and the light weight requirement can be met. Therefore, the invention takes the traditional honeycomb structure as a basis, realizes the effect of absorbing vibration and noise in the engine room by improving the honeycomb structure and adding a multilayer composite structure in the honeycomb, and improves the riding comfort of people.

Disclosure of Invention

The invention aims to solve the problem that the noise and vibration in the cabin are serious at present, and aims to absorb the noise and vibration in the cabin, realize light weight and improve the comfort of passengers on the premise of meeting the strength requirement.

In order to solve the problems, the invention provides a honeycomb sandwich plate embedded with a multi-layer structure, wherein the sandwich plate is of a sandwich structure consisting of an upper panel, a lower panel and a middle honeycomb core;

the honeycomb core is formed by combining a plurality of square corrugated pipe arrays; the corrugation of the corrugated pipe is a sine curve;

a hierarchical composite structure is embedded in the square corrugated pipe along the height direction, the first layer is an energy absorption plate from top to bottom, and the energy absorption plate is formed by arranging a plurality of energy absorption cells along the length direction of the square corrugated pipe; the second layer is a spiral pipe which is arranged along the height of the square corrugated pipe, and the upper end and the lower end of the spiral pipe respectively form a sandwich structure with the two polyester fiber plates; the third layer is of a lattice structure and is formed by arranging a plurality of lattice monomer arrays. The upper and lower panels are made of carbon fiber plates, the tensile strength of which is several times that of common steel, and the carbon fiber plates have excellent creep resistance, corrosion resistance and shock resistance.

In a preferred embodiment: the honeycomb core structure adopts aluminum alloy as a material.

In a preferred embodiment: the upper and lower panels are carbon fiber panels.

In a preferred embodiment: the energy absorption cell is of a twenty-hexahedron structure.

In a preferred embodiment: the lattice single body is internally filled with sound-absorbing cotton

Compared with the prior art, the invention has the beneficial effects that:

1. the honeycomb sandwich structure has obvious energy absorption effect

The initial peak force of the square section is small, and the sine wave is used as induction, so that the whole honeycomb sandwich structure has a good absorption effect on external vibration and impact, and the upper panel and the lower panel are made of carbon fiber plates and have excellent creep resistance, corrosion resistance and shock resistance; the honeycomb is made of aluminum alloy, and has low density and high strength. By utilizing the high energy absorption characteristic of the carbon fiber and the good ductility of the aluminum alloy, more energy can be absorbed through the honeycomb sandwich structure, and the energy absorption effect is more obvious.

2. Multilevel energy absorption, high energy absorption efficiency and strong sustainability

When the outside has vibration and energy impact, the honeycomb sandwich plate is deformed through the corrugations to carry out primary energy absorption, when energy is transmitted to the inside of the honeycomb, the first-layer energy-absorbing cell group of the composite structure starts to play a role, the deformation occurs, a part of energy and vibration are further absorbed, and the energy-absorbing cells are compressed to provide a larger energy-absorbing space, so that the energy absorption of the honeycomb sandwich structure and the energy absorption of a subsequent composite structure are more sufficient. After passing through the energy-absorbing cell group, the energy is transmitted to the second layer of spiral structure, and the characteristics of the second layer of spiral structure like a spring are utilized to further absorb the impact energy and the vibration. The last layer of the honeycomb inner composite structure is a lattice structure consisting of three-dimensional lattices, has anisotropy, can convert a complex stress state into a simple tensile and compressive stress state in a rod piece, can be used as a bearing part, can absorb vibration, and improves energy absorption efficiency. The honeycomb sandwich shell and the hierarchical composite structure complement and complement each other in advantages and disadvantages, impact energy and vibration of the airplane are effectively absorbed, and the multi-level structure is strong in absorption sustainability.

3. The noise is absorbed by multiple layers, the noise reduction effect is obvious, and the flame retardant effect is achieved

When the noise passes through composite construction, polyester fiber board and the beginning noise absorption of second floor helical structure, the cavity resonance sound absorbing structure that utilizes helical structure to form and the good noise absorption's of polyester fiber ability, the noise that the transmission entered in the aircraft cabin is mostly absorbed by this part structure, after most noise is absorbed, residual noise can be inlayed and inhale the sound cotton absorption in third floor lattice structure, in addition, inhale the sound cotton and can also play fire-retardant effect, prevent that the cabin from catching fire and spreading too fast, improve passenger self security level.

4. Porous structure and light material, and can meet the requirement of light weight

In consideration of the strict requirement of the airplane on the dead weight, the invention adopts fiberboards and aluminum materials except for the polyester fiberboards between the second layer of spiral structure and the first layer of composite structure and the third layer of composite structure, the selected materials have lower average density, and the porous structure is adopted to save the materials, reduce the dead weight and meet the requirement of light weight.

5. Stable structure and high adaptability

The outer carbon fiber not only has the inherent intrinsic characteristics of the carbon material, but also has the soft processability of textile fiber, is a new generation of reinforced fiber, enhances the strength and rigidity of the sandwich plate, and has excellent external adaptability. The corrugated pipe structure and the honeycomb internal lattice structure ensure that the energy-absorbing honeycomb structure has good stability when facing energy impact, and the whole shape of the energy-absorbing honeycomb structure is not greatly distorted when the corrugated pipe and the first layer of energy-absorbing cell group deform in the energy-absorbing process, so that the structural stability is good. The invention can not only absorb the vibration and noise generated in the normal operation of the airplane, but also absorb certain collision energy when the airplane is impacted by external airflow or collision impact, thereby protecting the safety of passengers in the passenger cabin.

Drawings

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a schematic view of a honeycomb core and a corrugated tube;

FIG. 3 is a schematic diagram of a hierarchical composite structure;

FIG. 4 is a schematic view of a first layer of energy absorbing panel;

FIG. 5 is a schematic view of a second layer of the spiral structure;

FIG. 6 is a schematic diagram of a third layer lattice structure;

in the figure: 101 is a carbon fiber plate; 102 is a honeycomb core; 301 is a bellows; 302 is an energy absorbing plate; 303 is a spiral tube; 304 is a lattice structure; 305 is a polyester fiberboard; 601 is sound absorbing cotton.

Detailed Description

The description is further illustrated with reference to specific examples.

The overall schematic diagram of the honeycomb sandwich panel with embedded multi-level structure provided in this embodiment is shown in fig. 1, and the honeycomb sandwich panel is composed of an upper panel 101, a lower panel 101, and a middle honeycomb core 102.

The upper and lower panels 101 are made of carbon fiber plates, the tensile strength of which is several times that of common steel, and the carbon fiber plates have excellent creep resistance, corrosion resistance and shock resistance.

The honeycomb core structure 102 is made of aluminum alloy and is formed by combining a plurality of square corrugated pipe arrays, as shown in fig. 2, the corrugation of the corrugated pipe is induced by a sine curve, and compared with the traditional corrugated pipe with a triangular cross section, the corrugated pipe has a better vibration absorption effect.

The inner part of the square corrugated pipe is embedded with a hierarchical composite structure, as shown in fig. 2, the inner part of the square corrugated pipe is of a three-layer composite structure, the first layer is an energy-absorbing plate 302 and is formed by arranging a plurality of energy-absorbing cells along the length direction of the square corrugated pipe, as shown in fig. 4, each energy-absorbing cell is of a twenty-hexagonal structure and is made of aluminum material with light weight and good energy-absorbing effect. Energy is transmitted to the first layer of energy absorption structure through the upper panel, the energy absorption cells begin to absorb the energy and deform, and the energy absorption space of the multi-level composite structure is enlarged while the energy is weakened. The second layer is spiral pipe 303, it sets up along the direction of height of square screwed pipe, and its upper and lower both ends have constituted sandwich structure with two polyester fiber boards respectively, as shown in fig. 5, polyester fiber board is the material that has the sound absorbing function that uses polyester fiber and glass silk as raw materials to make through hot briquetting, the highest sound absorption coefficient reaches more than 0.9 in 125-4000 HZ noise range, utilize the unique spiral hole clearance of spiral pipe simultaneously, can produce resonance with the sound wave, form cavity resonance sound absorption structure, for traditional porous structure, this structure has improved the sound absorption coefficient when widening the frequency band, good sound absorption effect has. The two interact with each other to effectively absorb noise, and in addition, the characteristics of the spiral structure spring are utilized to further absorb impact energy and vibration. The third layer is lattice structure 304, as shown in fig. 6, the lattice structure is formed by arranging a plurality of lattice monomers in an array manner, has anisotropy, can convert a complex stress state into a simple tension-compression stress state in a rod piece, can be used as a part for absorbing vibration and can bear load, sound-absorbing cotton 601 is filled in each monomer, residual noise transmitted to the third layer can be absorbed, and a flame-retardant effect is achieved. The invention generally adopts light materials and porous structures, and meets the requirement of light weight.

By utilizing the high energy absorption characteristic of the carbon fiber and the good ductility of the aluminum alloy, more energy can be absorbed through the honeycomb sandwich structure, and the energy absorption effect is more obvious. Utilize embedded multilayer level composite construction of honeycomb, not only can absorb the vibration and the noise that the aircraft normally operated produced, can also absorb certain collision energy when the aircraft meets with external air current impact or collision impact, the energy-absorbing is efficient, and sustainability is strong, can also play fire-retardant effect effectively after the main cabin catches fire, has improved passenger's the travelling comfort of taking advantage of in the main cabin to play the effect of protection passenger safety.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and variations or technical scopes disclosed by the present invention can be easily conceived by those skilled in the art. Alternatives are intended to be included within the scope of the invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. The utility model provides an embedded multilevel structure's honeycomb sandwich panel which characterized in that: the sandwich plate is of a sandwich structure consisting of an upper panel, a lower panel and a middle honeycomb core;

the honeycomb core is formed by combining a plurality of square corrugated pipe arrays; the corrugation of the corrugated pipe is a sine curve; two end faces of the corrugated pipe are respectively abutted with the upper panel and the lower panel;

a hierarchical composite structure is embedded in the square corrugated pipe along the height direction, the first layer is an energy absorption plate from top to bottom, and the energy absorption plate is formed by arranging a plurality of energy absorption cells along the length direction of the square corrugated pipe; the second layer is a spiral pipe which is arranged along the height of the square corrugated pipe, and the upper end and the lower end of the spiral pipe respectively form a sandwich structure with the two polyester fiber plates; the third layer is of a lattice structure and is formed by arranging a plurality of lattice monomer arrays.

2. The honeycomb sandwich panel with embedded multilevel structure of claim 1, wherein: the honeycomb core structure adopts aluminum alloy as a material.

3. The honeycomb sandwich panel with embedded multilevel structure of claim 1, wherein: the upper and lower panels are carbon fiber panels.

4. The honeycomb sandwich panel with embedded multilevel structure of claim 1, wherein: the energy absorption cell is of a twenty-hexahedron structure.

5. The honeycomb sandwich panel with embedded multilevel structure of claim 1, wherein: and sound-absorbing cotton is filled in the dot matrix single body.