CN112971258A - Bionic protective helmet lining with vibration damping and energy absorbing effects - Google Patents

Bionic protective helmet lining with vibration damping and energy absorbing effects Download PDF

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Publication number
CN112971258A
CN112971258A CN202110276145.4A CN202110276145A CN112971258A CN 112971258 A CN112971258 A CN 112971258A CN 202110276145 A CN202110276145 A CN 202110276145A CN 112971258 A CN112971258 A CN 112971258A
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CN
China
Prior art keywords
energy
vibration
damping
layer
absorbing
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Pending
Application number
CN202110276145.4A
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Chinese (zh)
Inventor
韩志武
张爽
张俊秋
李因武
韩奇钢
牛士超
穆正知
李博
张斌杰
秦晓静
杨敬德
张芷嫣
王宇飞
宋文达
李健豪
刘莉莉
葛俊洋
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Jilin University
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Jilin University
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Priority to CN202110276145.4A priority Critical patent/CN112971258A/en
Publication of CN112971258A publication Critical patent/CN112971258A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/10—Linings
    • A42B3/12—Cushioning devices
    • A42B3/125—Cushioning devices with a padded structure, e.g. foam
    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/10—Linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0235—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption

Landscapes

  • Helmets And Other Head Coverings (AREA)

Abstract

The invention discloses a bionic protective helmet lining with vibration damping and energy absorbing effects, which comprises: the energy absorption layer is positioned between the two vibration damping layers; the damping layer adopts a damping layer structure imitating the head bone of a woodpecker; the damping layer includes: the hard rectangular frame is internally provided with a plurality of rectangular holes; the viscoelastic filling piece is connected with the inner wall of the rectangular hole; the viscoelastic filling piece generates viscoelastic deformation to reduce vibration, the hard structure provides structural strength, and the energy absorption layer is used for absorbing energy. An energy absorption layer is arranged between two vibration absorption layers in the helmet liner, the vibration absorption layers adopt a hard rectangular frame and a viscoelastic filling piece, and when the helmet liner is subjected to external force, the viscoelastic filling piece can generate viscoelastic deformation, so that vibration is reduced by attenuating stress waves. On the basis of the vibration absorption layer, the energy absorption layer absorbs the energy of vibration, and the vibration absorption layer and the energy absorption layer are matched to realize the energy absorption and vibration reduction effects, so that the safety of the helmet lining is ensured.

Description

Bionic protective helmet lining with vibration damping and energy absorbing effects
Technical Field
The invention relates to the technical field of head injury protection, in particular to a lining of a bionic protective helmet with vibration damping and energy absorption effects.
Background
Helmet liners are important components of various protective helmets. The helmet has the main function of buffering shock waves, stress waves and the like transmitted from the helmet shell so as to avoid the damage to human brain, and is an important guarantee for life safety providers of soldiers, construction workers and other wearers. With the development of science and technology, the shell of the protective helmet has excellent strength to ensure that the brain of a person is not injured by shock, but under many working conditions, a wearer often generates injuries such as concussion and the like because the vibration reduction and energy absorption performance of the helmet is not enough, so that hidden dangers are caused to the life health of the wearer, and in order to further ensure the life health of the wearer of the protective helmet, the helmet liner capable of efficiently reducing vibration and absorbing energy is very necessary.
In the prior art, the lining of the helmet is mostly filled with materials such as foamed plastics or is directly supported by a plastic skeleton structure, the lining of the helmet is often low in strength and easy to deform, the damping and energy-absorbing effects are poor, the head of a wearer can be greatly influenced by external forces such as strong impact, and potential safety hazards exist.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention aims to solve the technical problem that the bionic protective helmet liner with vibration reduction and energy absorption effects is poor in vibration reduction and energy absorption effects in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a bionic protective helmet liner with vibration damping and energy absorbing effects comprises: the energy absorption layer is positioned between the two vibration damping layers;
the damping layer adopts a damping layer structure imitating the head bone of a woodpecker;
the vibration damping layer includes:
the device comprises a hard rectangular frame, wherein a plurality of rectangular holes are formed in the hard rectangular frame;
the viscoelastic filling piece is connected with the inner wall of the rectangular hole;
the viscoelastic filling piece is subjected to viscoelastic deformation to reduce vibration, the hard rectangular frame provides structural strength, and the energy absorption layer is used for absorbing energy.
The bionic protective helmet lining with vibration reduction and energy absorption effects is characterized in that the energy absorption layer comprises:
an energy absorber;
a micro-hole disposed within the energy absorber;
wherein the micro-pores deform to absorb energy.
The bionic protective helmet lining with the vibration-damping and energy-absorbing effects is characterized in that a plurality of micropores are formed;
the size of the micropore far away from the vibration damping layer in the energy absorbing body is larger than that of the micropore close to the vibration damping layer in the energy absorbing body; and/or the presence of a gas in the gas,
the distribution density of micropores far away from the vibration damping layer in the energy absorption body is greater than that of micropores close to the vibration damping layer in the energy absorption body.
The bionic protective helmet liner with the vibration-damping and energy-absorbing effects is characterized in that the maximum size of the micropores is 1-5 times of the minimum size of the micropores;
the maximum distribution density of the micropores is 1-5 times of the minimum distribution density of the micropores.
The bionic protective helmet lining with the vibration-damping and energy-absorbing effects is characterized in that the plurality of micropores are formed by adjusting the position and dosage of the foaming agent.
The bionic protective helmet lining with vibration reduction and energy absorption effects, wherein the micropores comprise: spherical and/or ellipsoidal pores, the volume of the micropores being1-5mm3。
The bionic protective helmet lining with the vibration-damping and energy-absorbing effects is characterized in that the energy-absorbing body is made of polystyrene.
The bionic protective helmet liner with the vibration-damping and energy-absorbing effects is characterized in that the rigid rectangular frame is made of one or more of polyurethane foam plastic, polystyrene foam plastic and polyvinyl chloride foam plastic;
the viscoelastic filling piece is made of latex and/or epoxy resin; and/or
The viscoelastic filling piece is connected with the inner wall of the rectangular hole by adopting viscose glue.
The liner of the bionic protective helmet with the vibration-damping and energy-absorbing effects is characterized in that a plurality of rectangular holes are arranged in a single row at equal intervals; and/or the presence of a gas in the gas,
the long side of the rectangular hole is parallel to the vibration damping layer.
The liner of the bionic protective helmet with the vibration-damping and energy-absorbing effects is characterized in that the long side of the rectangular hole is 2-3mm, and the wide side of the rectangular hole is 1-1.5 mm; and/or the presence of a gas in the gas,
the edge distance between two adjacent rectangular holes is 0.5-1 mm.
Has the advantages that: an energy absorption layer is arranged between two vibration absorption layers in the helmet liner, the vibration absorption layers adopt a hard rectangular frame and a viscoelastic filling piece, and when the helmet liner is subjected to external force, the viscoelastic filling piece can generate viscoelastic deformation, so that vibration is reduced by attenuating stress waves. On the basis of setting up the damping layer, set up the energy absorption layer, through the energy of energy absorption layer absorption vibration, realize the energy-absorbing damping effect through damping layer and the cooperation of energy absorption layer, ensure the security of helmet inside lining.
Drawings
FIG. 1 is a schematic structural diagram of the liner of the bionic helmet with vibration-damping and energy-absorbing effects.
FIG. 2 is a cross-sectional view of the lining of the bionic helmet with vibration-damping and energy-absorbing effects.
FIG. 3 is a schematic structural diagram of the liner of the bionic protective helmet with vibration-damping and energy-absorbing effects in the invention when stressed.
Description of reference numerals:
1. a top damping layer; 2. an energy absorbing layer; 21. spherical micropores; 22. ellipsoidal micropores; 3. a bottom vibration damping layer; 31. a rigid rectangular frame; 32. a viscoelastic filling member.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-3, the present invention provides embodiments of an inner lining of a bionic helmet with vibration and energy absorption effects.
The woodpecker is a bird which takes a woodpecker to capture insects as a live stock, the action time of the woodpecker and trees is 0.5-1ms in one pecking of the woodpecker, the maximum instantaneous speed in the duration can reach 7m/s, the maximum acceleration can reach 1200g, and no brain damage can be generated in the high-frequency and high-speed impact, because structures such as a sponge bone of a woodpecker skull and the like have excellent energy absorption and vibration reduction performance, the brain is protected to be within an acceptable vibration frequency range, and the safety is ensured.
The invention imitates the vibration-damping and energy-absorbing structure of sponge bone of the woodpecker skull, applies the vibration-damping and energy-absorbing structure to the lining of the protective helmet, realizes the high efficiency of the vibration-damping and energy-absorbing function of the protective helmet, increases the structural strength and the deformation resistance of the helmet, enhances the protection and protection performance of the helmet, and reduces the harm of external impact and the like to the human brain.
As shown in fig. 1-2, the lining of the bionic helmet with vibration-damping and energy-absorbing effects of the present invention comprises: the energy absorption layer is positioned between the two vibration damping layers;
the damping layer is a damping layer imitating the head bone of a woodpecker;
the vibration damping layer includes:
the device comprises a hard rectangular frame, wherein a plurality of rectangular holes are formed in the hard rectangular frame;
the viscoelastic filling piece is connected with the inner wall of the rectangular hole;
the viscoelastic filling piece is subjected to viscoelastic deformation to reduce vibration, the hard rectangular frame provides structural strength, and the energy absorption layer is used for absorbing energy. When the vibration increases, a longer damping path can be provided for the vibration by increasing the thickness of the viscoelastic filling member, i.e., increasing the thickness of the damping layer can improve the damping performance of the helmet liner as a whole.
The structure that the cerebrospinal fluid of the woodpecker skull flows in the rectangular micropores after the impact isodynamic force is exerted on the woodpecker skull, the vibration is reduced by attenuating stress waves, and the energy absorption can be realized by the sponge bone structure of the woodpecker skull. Therefore, the hard rectangular frame is adopted to imitate the skull of the woodpecker, the viscoelastic filling piece is adopted to imitate the cerebrospinal fluid of the skull of the woodpecker, and the energy absorbing layer is adopted to imitate the sponge bone structure of the skull of the woodpecker.
Specifically, an energy absorption layer is arranged between two vibration reduction layers in the helmet liner, and the vibration reduction layers adopt a hard rectangular frame and viscoelastic filling pieces. As shown in fig. 3, when the helmet liner is subjected to an external force, the viscoelastic filling member may be deformed viscoelastically, thereby reducing vibration by attenuating stress waves. On the basis of setting up the damping layer, set up the energy absorption layer, through the energy of energy absorption layer absorption vibration, realize the energy-absorbing damping effect through damping layer and the cooperation of energy absorption layer, ensure the security of helmet inside lining. The viscoelastic filling member is connected to the inner wall of the rectangular hole, and therefore, even if viscoelastic deformation occurs, it can be quickly recovered to quickly reduce vibration.
It should be noted that, as shown in fig. 1, the external shapes of the energy absorption layer and the vibration reduction layer are completely fitted with the corresponding helmet shell structures. The number of the vibration damping layers and the number of the energy absorbing layers can be set according to requirements. For example, 3 damping layers, 2 energy absorbing layers are provided; for another example, 3 damping layers and 1 energy absorbing layer are provided.
In the present embodiment, 2 damping layers and 1 energy absorbing layer are taken as an example for explanation, and as shown in fig. 2, the 2 damping layers may be respectively referred to as a top damping layer 1 and a bottom damping layer 3. Top damping layer 1 and bottom damping layer 3 adopt the same structure, and top damping layer 1 and bottom damping layer 3 all include: a rigid rectangular frame 31 and a viscoelastic filling member 32. Top damping layer 1, energy-absorbing layer 2, bottom damping layer 3, superpose according to the order from outside to inside in proper order, just each layer is together fixed through the mode of hot pressing, and top damping layer is first used, reduces the vibration, makes its stress wave that transmits the lower floor that is exactly the energy-absorbing layer reduce to reduce the energy-absorbing pressure on energy-absorbing layer, bottom damping layer carries out final decay to the stress wave after energy-absorbing layer, guarantees the security.
In one implementation of this embodiment, the rigid rectangular frame is made of rigid foam. Rigid foam refers to foam having a certain hardness. The rigid foam plastic is light-weight foam plastic with high compression hardness, such as polyurethane foam plastic, polystyrene foam plastic, rigid polyvinyl chloride foam plastic and the like. That is, the rigid rectangular frame is made of one or more of polyurethane foam, polystyrene foam, and polyvinyl chloride foam.
The viscoelastic filling piece is made of a viscoelastic material, the viscoelastic material is epoxy resin, latex and the like, and the viscoelastic filling piece is made of latex and/or epoxy resin. Epoxy resins are more suitable for use in special environments such as high temperature and high humidity, and latex materials are preferred because latex materials have a slightly lower damping decay rate than epoxy resins, but are more economical and have better processability. The hard material and the viscoelastic material are compounded, so that the effects of excellent vibration reduction and result strength increase are achieved.
In one implementation of this embodiment, the viscoelastic filling member and the inner wall of the rectangular hole are connected by using glue. A plurality of the rectangular holes are arranged in a single row at equal intervals.
Specifically, the rectangular holes of the vibration damping layer are uniformly arranged in a single row on the cross section of the vibration damping layer, and the viscoelastic filling pieces of the vibration damping layer are uniformly filled in the rectangular holes. Specifically, a plurality of rectangular holes are uniformly arranged on the cross section of the vibration damping layer to form a rigid rectangular frame, and the viscoelastic filling member is fixedly filled in the rectangular holes by using an adhesive.
In one implementation of this embodiment, the long sides of the rectangular holes are parallel to the damping layer.
Specifically, in order to facilitate the viscoelastic deformation of the viscoelastic filler, the long sides of the rectangular hole are parallel to the vibration damping layer, so that the rectangular hole has enough space for the viscoelastic filler to perform viscoelastic deformation. Of course, it is also advantageous to make the damping layer light and thin.
The whole thickness of the lining also has an important influence on the vibration damping and energy absorbing performance, if the whole thickness is larger, the size of the helmet is increased, and the attractiveness and the comfort are influenced; if the whole thickness of the lining is smaller, the transmission distance from the impact to the brain of a human body can be reduced, the energy absorption and vibration reduction effects of the lining can be weakened, and the ideal protection effect cannot be achieved. Therefore, the thickness of the whole and each layer needs to be reasonably controlled, and the requirements of various aspects of the helmet are met.
Specifically, the thicknesses of the two damping layers are both within the range of 1.5-2.5mm, and in the range, the damping performance of the whole lining can be improved by increasing the thicknesses of the damping layers; the thickness of the energy absorption layer is within the range of 3.5-4.5mm, and the energy absorption effect of the whole lining can be improved by increasing the thickness of the energy absorption layer within the range; particularly, the whole thickness dimension of the lining is in the range of 7-8mm in consideration of the practical requirement of the helmet.
In an implementation manner of this embodiment, the long side of the rectangular hole is 2-3mm, and the wide side of the rectangular hole is 1-1.5 mm.
The width of the rectangular hole is set according to the thickness of the vibration damping layer, and the length of the rectangular hole is set according to needs.
In one implementation manner of the embodiment, the edge distance between two adjacent rectangular holes is 0.5-1 mm.
Specifically, the distance between the edges of two adjacent rectangular holes in the vibration damping layer is 0.5-1 mm.
In one implementation manner of this embodiment, the energy absorption layer includes:
an energy absorber;
a micro-hole disposed within the energy absorber;
wherein the micro-pores deform to absorb energy.
The energy absorption layer adopts a porous structure.
In one implementation of this embodiment, the energy absorber is made of polystyrene. Expandable Polystyrene (EPS) has excellent use properties and is economical. Not only has good damping nature, still has the performance that the quality is light, heat preservation etc. promoted helmet inside lining comfort simultaneously, consequently the energy absorbing layer in this embodiment is made by the EPS material.
In one implementation of this embodiment, the microwells include: spherical and/or ellipsoidal pores with a volume of 1-5mm3。
Specifically, the micropores are in an ellipsoidal or spherical shape, and absorb energy by deforming after being subjected to the action of impact and the like, and meanwhile, the gradient pores can realize gradual decrease of the energy and effectively absorb the energy.
In one implementation of this embodiment, there are a plurality of the micro-wells; the size of the micropores in the energy absorbing body far away from the vibration damping layer is larger than that of the micropores in the energy absorbing body near the vibration damping layer. In one implementation of this embodiment, the distribution density of the micro-pores of the energy absorber remote from the damping layer is greater than the distribution density of the micro-pores of the energy absorber close to the damping layer. The distribution density of micropores in the energy absorber is within a certain range, and the higher the density is, the better the energy absorption effect is.
Specifically, the size of the micropores in the middle of the energy absorbing body is larger, the sizes of the micropores on two sides of the energy absorbing body are smaller, and when the micropores adopt spherical pores, the sizes of the micropores refer to the diameters of the micropores; the micropores adopt ellipsoid-shaped pores, and the sizes of the micropores refer to the long diameter and the short diameter of the micropores.
The energy absorber has a greater number of micro-pores in the middle (i.e., a greater distribution density) and a lesser number of micro-pores on both sides (i.e., a lesser distribution density).
Gradient holes are formed by changing the size and/or distribution density of the micropores, so that gradual energy absorption is realized, and a better energy absorption effect is formed.
In the radial path from the center of the energy absorber to the two ends of the energy absorber of the helmet, the size of the micropores is changed from large to small, the distribution density of the micropores is changed from large to small, the gradient distribution of pores is formed, the structure is inspired by the sponge bone structure of the beak skull of the woodpecker, the micropores absorb energy through deformation, and meanwhile, the gradient pores can realize gradual reduction of energy and effective energy absorption.
In one implementation of this embodiment, the maximum dimension of the microwells is 1-5 times the minimum dimension of the microwells; the maximum distribution density of the micropores is 1-5 times of the minimum distribution density of the micropores. In the size range of the micropores, the larger the size grade gradient span of the micropores is, the better the energy absorption effect is. In the distribution range of micropores, the higher the density of the micropores is, the better the energy absorption effect is.
Specifically, as shown in fig. 2, the energy absorbing layer adopts spherical micropores 21 or ellipsoidal micropores 22, and the size and the density of the energy absorbing layer are gradually reduced from the middle of the energy absorbing layer to the two ends. The maximum size of the micropores is generally 1 to 5 times the minimum size of the micropores, and the maximum distribution density of the micropores is generally 1 to 5 times the minimum distribution density of the micropores.
In one implementation of this embodiment, a number of the micro-cells are formed by adjusting the location and dosage of the blowing agent.
Specifically, when the energy absorbing layer is formed, a foaming agent is added to the energy absorbing body, thereby forming micropores. The distribution density of the cells can be varied by adjusting the position of the blowing agent, and the size of the cells can be varied by the dosage of the blowing agent. When the dosage is large, the size of the micropore is large; the size of the micropores is small when the dose is small.
Detailed description of the preferred embodiment
The structure of the vibration damping layer is formed by filling viscoelastic materials in a hard rectangular micropore frame, the hard rectangular pore structures are uniformly arrayed in a single row on the cross section of the plate, and the rectangular micropores are uniformly filled with the viscoelastic fillers of the vibration damping layer; the viscoelastic filling material is fixed in an adhesive connection mode; in the paths from the central position of the plate to the two ends of the plate in the stress direction, the size of the holes is reduced from large to small, the density of the holes is reduced from large to small, and gradient distribution of the holes is formed.
Wherein the dimensions of the rectangular micropores of the vibration damping layer are as follows: 2mm long and 1mm wide, and the distance between the edges of the adjacent hard rectangular holes of the vibration damping layer is 0.5 mm; the pore shape of the energy absorption layer is spherical or ellipsoidal, and the volume size of the energy absorption layer is mainly 5mm3、2.5mm3、1mm3Three kinds of the components are adopted. The central pore density is 5 times the two-sided pore density.
Specifically, the overall thickness of the lining is 7mm, wherein the thicknesses of the two damping layers are both 2mm, and the total thickness is 4 mm; the thickness of the energy absorption layer is 3mm, the top vibration reduction layer acts firstly to reduce vibration, so that stress waves transmitted to the lower layer, namely the energy absorption layer, are reduced, the energy absorption pressure of the energy absorption layer is reduced, the bottom vibration reduction layer performs final attenuation on the stress waves after the energy absorption layer, and the safety is ensured
Detailed description of the invention
The structure of the vibration damping layer is formed by filling viscoelastic materials in a hard rectangular micropore frame, the hard rectangular pore structures are uniformly arrayed in a single row on the cross section of the plate, and the rectangular micropores are uniformly filled with the viscoelastic fillers of the vibration damping layer; the viscoelastic filling material is fixed in an adhesive connection mode; in the paths from the central position of the plate to the two ends of the plate in the stress direction, the size of the holes is reduced from large to small, the density of the holes is reduced from large to small, and gradient distribution of the holes is formed.
Wherein the dimensions of the rectangular micropores of the vibration damping layer are as follows: 3mm long and 1.5mm wide, and the distance between the edges of the adjacent hard rectangular holes of the vibration damping layer is 0.5 mm; the pore shape of the energy absorption layer is spherical or ellipsoidal, and the volume size of the energy absorption layer is mainly 5mm3、3mm3、1mm3Three kinds of the components are adopted. The central pore density is 5 times the two-sided pore density.
The overall thickness of the lining also has an important influence on the vibration damping and energy absorbing performance, and if the overall thickness is larger, the size of the helmet is increased, and the attractiveness and the comfort are influenced; if the whole thickness of the lining is smaller, the transmission distance from the impact to the brain of a human body can be reduced, the energy absorption and vibration reduction effects of the lining can be weakened, and the ideal protection effect cannot be achieved. Therefore, the thickness of the whole and each layer needs to be reasonably controlled, and the requirements of various aspects of the helmet are met.
Specifically, the overall thickness of the lining is 8mm, wherein the thicknesses of the two damping layers are both 2.5mm, and the total thickness is 5 mm; the thickness on energy-absorbing layer is 3mm, and the top damping layer is first used, reduces the vibration, makes its stress wave that transmits the lower floor namely energy-absorbing layer reduce to reduce the energy-absorbing pressure on energy-absorbing layer, bottom damping layer carries out last decay to the stress wave behind energy-absorbing layer, guarantees the security.
Detailed description of the preferred embodiment
The structure of the vibration damping layer is formed by filling viscoelastic materials in a hard rectangular micropore frame, the hard rectangular pore structures are uniformly arrayed in a single row on the cross section of the plate, and the rectangular micropores are uniformly filled with the viscoelastic fillers of the vibration damping layer; the viscoelastic filling material is fixed in an adhesive connection mode; in the paths from the central position of the plate to the two ends of the plate in the stress direction, the size of the holes is reduced from large to small, the density of the holes is reduced from large to small, and gradient distribution of the holes is formed.
The vibration damping layers and the energy absorption layers are overlapped and fixed through hot pressing;
the appearance shapes of the energy absorption layer and the vibration reduction layer are completely attached to the corresponding helmet shell structures;
wherein the dimensions of the rectangular micropores of the vibration damping layer are as follows: 2.5mm long and 1mm wide, and the distance between the edges of the adjacent hard rectangular holes of the vibration damping layer is 0.75 mm; the pore shape of the energy absorption layer is spherical or ellipsoidal, and the volume size of the energy absorption layer is mainly 3mm3、2mm3、1mm3Three kinds of the components are adopted. The central pore density is 5 times the two-sided pore density.
The energy absorption layer structure is inspired by the sponge bone structure of the woodpecker skull, the micropores absorb energy through deformation after being acted by impact isodynamic force, and meanwhile, the gradient holes can realize gradual decrease of the energy and effectively absorb the energy; the vibration damping layer has a rectangular micropore filled with a viscoelastic material, and this structure is inspired by a structure in which cerebrospinal fluid of the beak bone of a woodpecker flows in the rectangular micropore to reduce vibration by damping a stress wave.
The overall thickness of the lining also has an important influence on the vibration damping and energy absorbing performance, and if the overall thickness is larger, the size of the helmet is increased, and the attractiveness and the comfort are influenced; if the whole thickness of the lining is smaller, the transmission distance from the impact to the brain of a human body can be reduced, the energy absorption and vibration reduction effects of the lining can be weakened, and the ideal protection effect cannot be achieved. Therefore, the thickness of the whole and each layer needs to be reasonably controlled, and the requirements of various aspects of the helmet are met.
Specifically, the overall thickness of the lining is 8mm, wherein the thicknesses of the two damping layers are both 2.5mm, and the total thickness is 5 mm; the thickness on energy-absorbing layer is 3mm, and the top damping layer is first used, reduces the vibration, makes its stress wave that transmits the lower floor namely energy-absorbing layer reduce to reduce the energy-absorbing pressure on energy-absorbing layer, bottom damping layer carries out last decay to the stress wave behind energy-absorbing layer, guarantees the security.
The invention relates to a helmet liner capable of efficiently damping vibration and absorbing energy for imitating the skull of a woodpecker in the field of head injury protection, which comprises a vibration damping layer made of rigid foam plastics such as polyurethane foam plastics and the like and visco-elastic materials such as latex and the like, and an energy absorbing layer made of porous structural materials such as EPS and the like; and the top vibration damping layer, the energy absorption layer and the bottom vibration damping layer are sequentially arranged in the direction from the position far away from the head part to the position close to the head part, and the layers are connected in a hot pressing mode. The shape of the holes in the energy absorbing layer is ellipsoidal or spherical, the size of the holes in the energy absorbing layer is changed from big to small, the density of the holes is changed from big to small in the radial direction of the head from the center of the material to the two ends of the material layer, the holes are distributed in a gradient mode, the structure is inspired by the sponge bone structure of the wood-pecking bird skull, the energy is absorbed by the micropores through deformation after the structure is impacted by the force of the impact and the like, and meanwhile, the gradient holes can realize gradual energy reduction and effective energy absorption; the vibration damping layer has a rectangular micropore filled with a viscoelastic material, and this structure is inspired by a structure in which cerebrospinal fluid of the beak bone of a woodpecker flows in the rectangular micropore to reduce vibration by damping a stress wave. The vibration reduction layer and the energy absorption layer are matched to efficiently reduce the vibration and energy transmitted to the brain through the helmet lining, so that the vibration reduction and energy absorption performance of the helmet is enhanced, and the head is protected to minimize the impact on the head when the head is impacted and vibrated.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a bionical protective helmet inside lining with damping energy-absorbing effect which characterized in that includes: the energy absorption layer is positioned between the two vibration damping layers;
the damping layer adopts a damping layer structure imitating the head bone of a woodpecker;
the vibration damping layer includes:
the device comprises a hard rectangular frame, wherein a plurality of rectangular holes are formed in the hard rectangular frame;
the viscoelastic filling piece is connected with the inner wall of the rectangular hole;
the viscoelastic filling piece is subjected to viscoelastic deformation to reduce vibration, the hard rectangular frame provides structural strength, and the energy absorption layer is used for absorbing energy.
2. The biomimetic protective helmet liner with vibration and energy absorption effects of claim 1, wherein the energy absorption layer comprises:
an energy absorber;
a micro-hole disposed within the energy absorber;
wherein the micro-pores deform to absorb energy.
3. The liner of bionic helmet with vibration-damping and energy-absorbing effects as claimed in claim 2, wherein said pores are provided in plurality;
the size of the micropore far away from the vibration damping layer in the energy absorbing body is larger than that of the micropore close to the vibration damping layer in the energy absorbing body; and/or the presence of a gas in the gas,
the distribution density of micropores far away from the vibration damping layer in the energy absorption body is greater than that of micropores close to the vibration damping layer in the energy absorption body.
4. The liner of bionic protective helmet with vibration-damping and energy-absorbing effects as claimed in claim 3, wherein the maximum size of said micropores is 1-5 times the minimum size of said micropores;
the maximum distribution density of the micropores is 1-5 times of the minimum distribution density of the micropores.
5. The liner of bionic helmet with vibration-damping and energy-absorbing effects as claimed in claim 3, wherein the pores are formed by adjusting the position and dosage of foaming agent.
6. The biomimetic protective helmet liner with vibration damping and energy absorbing effects of claim 2, wherein the micro-pores comprise: spherical and/or ellipsoidal pores with a volume of 1-5mm3。
7. The liner of bionic helmet with vibration-damping and energy-absorbing effects as claimed in claim 2, wherein said energy-absorbing body is made of polystyrene.
8. The bionic protective helmet liner with the vibration-damping and energy-absorbing effects as claimed in any one of claims 1 to 7, wherein the rigid rectangular frame is made of one or more of polyurethane foam, polystyrene foam and polyvinyl chloride foam;
the viscoelastic filling piece is made of latex and/or epoxy resin; and/or
The viscoelastic filling piece is connected with the inner wall of the rectangular hole by adopting viscose glue.
9. The liner of bionic helmet with vibration-damping and energy-absorbing effects as claimed in any one of claims 1 to 7, wherein a plurality of said rectangular holes are arranged in a single row at equal intervals; and/or the presence of a gas in the gas,
the long side of the rectangular hole is parallel to the vibration damping layer.
10. The liner of bionic protective helmet with vibration-damping and energy-absorbing effects as claimed in claim 9, wherein the long side of the rectangular hole is 2-3mm, and the wide side of the rectangular hole is 1-1.5 mm; and/or the presence of a gas in the gas,
the edge distance between two adjacent rectangular holes is 0.5-1 mm.
CN202110276145.4A 2021-03-15 2021-03-15 Bionic protective helmet lining with vibration damping and energy absorbing effects Pending CN112971258A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201763872U (en) * 2010-06-25 2011-03-16 邱锦忠 Flexible particle damper
CN102693718A (en) * 2012-06-01 2012-09-26 西安交通大学 Variable aperture cell-semiopen foam sound absorption structure
CN103238973A (en) * 2013-05-20 2013-08-14 北京航空航天大学 Safety helmet with novel buffering shock-absorbing structure
CN203543225U (en) * 2013-09-02 2014-04-16 江苏大学 Composite damping vibration attenuation honeycomb sandwich plate
CN206909817U (en) * 2017-05-15 2018-01-23 国网山东省电力公司阳谷县供电公司 A kind of power construction helmet based on multilayer security structure
CN108032567A (en) * 2017-12-30 2018-05-15 中国科学院沈阳自动化研究所 A kind of shock resistance structure on imitative woodpecker head and preparation method thereof
CN110356051A (en) * 2019-07-22 2019-10-22 西安理工大学 A kind of crash energy absorption equipment of foam filled polygon honeycomb interlayer pipe
CN110641082A (en) * 2019-09-20 2020-01-03 厦门振为科技有限公司 Vibration-damping impact-reducing honeycomb damping plate and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201763872U (en) * 2010-06-25 2011-03-16 邱锦忠 Flexible particle damper
CN102693718A (en) * 2012-06-01 2012-09-26 西安交通大学 Variable aperture cell-semiopen foam sound absorption structure
CN103238973A (en) * 2013-05-20 2013-08-14 北京航空航天大学 Safety helmet with novel buffering shock-absorbing structure
CN203543225U (en) * 2013-09-02 2014-04-16 江苏大学 Composite damping vibration attenuation honeycomb sandwich plate
CN206909817U (en) * 2017-05-15 2018-01-23 国网山东省电力公司阳谷县供电公司 A kind of power construction helmet based on multilayer security structure
CN108032567A (en) * 2017-12-30 2018-05-15 中国科学院沈阳自动化研究所 A kind of shock resistance structure on imitative woodpecker head and preparation method thereof
CN110356051A (en) * 2019-07-22 2019-10-22 西安理工大学 A kind of crash energy absorption equipment of foam filled polygon honeycomb interlayer pipe
CN110641082A (en) * 2019-09-20 2020-01-03 厦门振为科技有限公司 Vibration-damping impact-reducing honeycomb damping plate and preparation method thereof

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Application publication date: 20210618