CN112680865B - Radar made of composite material and preparation method thereof - Google Patents
Radar made of composite material and preparation method thereof Download PDFInfo
- Publication number
- CN112680865B CN112680865B CN202011458962.3A CN202011458962A CN112680865B CN 112680865 B CN112680865 B CN 112680865B CN 202011458962 A CN202011458962 A CN 202011458962A CN 112680865 B CN112680865 B CN 112680865B
- Authority
- CN
- China
- Prior art keywords
- radar
- fabric
- warp
- weft
- composite material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention relates to a radar made of composite material and a preparation method thereof.A radar cover body is made of the composite material by taking phenolic resin as a matrix and taking a fabric for the radar as a reinforcing phase; the fabric for the radar is a single-layer plain woven fabric formed by interweaving warp yarns and weft yarns, and the shape of the curved surface of the single-layer plain woven fabric is consistent with that of the curved surface of the radar; all warp yarns on the single-layer plain woven fabric are parallel to a plane where any warp yarn in a bent shape is located, and all weft yarns are parallel to a plane where any weft yarn in a bent shape is located; the warp density and the weft density at all positions are the same; the preparation method comprises the following steps: establishing a model of the radar cover body, preparing a fabric for radar according to the model, placing the fabric for radar in a mould, and processing by taking phenolic resin as a main raw material to obtain the radar cover body; according to the preparation method of the radar made of the composite material, the fabric in the curved surface form can be directly woven, and the prepared radar is made of the carbon fiber composite material, so that the dielectric constant is higher, and the electromagnetic wave can be better absorbed.
Description
Technical Field
The invention belongs to the technical field of radars, and relates to a radar made of a composite material and a preparation method thereof.
Background
Radar, i.e. devices that find objects and determine their spatial position by radio, is also referred to as "radiolocation". The radar emits electromagnetic waves to irradiate a target and receives the echo of the target, so that information such as the distance from the target to an electromagnetic wave emission point, the distance change rate (radial speed), the azimuth and the altitude is obtained. With the improvement of the performance of each part parameter (such as beam directivity, receiver sensitivity, transmitter coherence, etc.), radar has become a powerful tool for human to detect targets with different properties. The existing radar plays an important role in the fields of military affairs, meteorology, traffic, aviation, remote sensing and remote measuring, exploration and the like besides detecting and positioning an airplane.
The radar in the prior art is positioned outdoors for a long time, and has the problem of insufficient stability of receiving and feeding back the electromagnetic waves caused by deformation and the like in the operation process due to large weight when the radar is used for a long time.
Disclosure of Invention
The invention aims to solve the technical problem that the receiving and feedback of electromagnetic waves are not stable enough due to the fact that the radar is heavy and deformed in the operation process when being used for a long time in the prior art, and provides a radar made of a composite material and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a radar made of composite materials comprises a radar cover body, a radar antenna and a radar support, wherein the radar antenna is positioned above the radar cover body, and the radar support is positioned below the radar cover body; the radar cover body is a composite material prepared by taking phenolic resin as a matrix and taking a plurality of layers of fabrics for radar as reinforcing phases;
the fabric for the radar is a single-layer plain woven fabric formed by interweaving warp yarns and weft yarns, and the shape of the curved surface of the single-layer plain woven fabric is consistent with that of the curved surface of the radar;
all warps on the single-layer plain woven fabric are parallel to the plane of any one bent warp; all weft yarns on the single-layer plain woven fabric are parallel to the plane where any one bent weft yarn is located; the warp density and the weft density of each part of the single-layer plain woven fabric are the same;
the radar cover body is a spherical crown with the diameter of 50-100 cm; in the radar cover body, the content of the phenolic resin is 10-20 wt%.
As a preferred technical scheme:
radar, single layer plain weave fabric, made of a composite material as described aboveWarp beamAnd weft density lambdaWeft yarn140-160 roots/10 cm; the number of layers is 1-3.
In the radar made of the composite material, the warp and the weft are both made of carbon fibers; the tensile strength of the carbon fiber is 17.0-20.4 cN/dtex, the elongation at break is 1.5-1.8%, and the fineness is 1000-3000 dtex.
In the radar made of the composite material, the fit coefficient of the radar fabric is more than 98%.
According to the radar made of the composite material, the bending strength of the radar cover body can reach 242-297 MPa (GJB 2895-97), the dielectric constant can reach 2.0-2.5C 2/(N.M 2) (GB/T11297.11-2015), and the tensile strength can reach 500-600 MPa (GB/T1447-2005).
The invention also provides a method for preparing a radar made of the composite material, which comprises the following steps:
(1) modeling: designing by adopting modeling software to obtain a three-dimensional model of the spherical-crown-shaped radome body with the diameter of 50-100 cm;
(2) establishing a space rectangular coordinate system: the plane of the bottom surface circle of the spherical crown is regarded as an X-Y plane, the spherical crown is positioned at the I th divinatory bone of the space rectangular coordinate system, and the convex surface of the spherical crown faces to the positive direction of the Z axis;
the tangent line of any point on the bottom circle of the spherical crown is an X axis, and the straight line which is vertical to the X axis and is tangent to the bottom circle is a Y axis;
(3) obtaining a weave point P formed by the intersection of the ith weft yarn and the jth warp yarn (the yarn numbers i and j are positive integers)i,jHeight h of the lifting heddleij：
Taking the X-axis direction as the warp direction and the Y-axis direction as the weft direction;
forming parallel surfaces of the X axis along the Y axis direction by the 1 st warp yarn of the X axis and the spacing of the adjacent warp yarns determined by the warp density, wherein the parallel surfaces are all vertical to the Y axis; the intersection line formed by the parallel surface and the spherical crown is the line where the warp yarn is located;
forming parallel planes of the Y axis along the X axis direction by the 1 st weft yarn of the Y axis and the spacing of the adjacent weft yarns determined by the weft density, wherein the parallel planes are all vertical to the X axis; the intersection line formed by the parallel surface and the spherical crown is the line where the weft yarn is located;
the point of intersection p formed by the thread in which the warp yarn is located and the thread in which the weft yarn is locatedi,j(xi,j,yi,j,zi,j) Is a tissue point Pi,j；
Tissue point Pi,jHeight h of the lifting heddlei,jIs zi,j(ii) a Wherein z isi,jIs an intersection point pi,jA z value in a space rectangular coordinate system; i is the serial number of the weft yarns, j is the serial number of the warp yarns, and i and j are positive integers;
(4) adopting plain weaving process, setting weaving area of the radar fabric, and forming each weave point P formed by intersecting the ith weft yarn and the jth warp yarn (yarn numbers i and j are positive integers) when forming each weave point in the weaving area of the radar fabrici,jHeight h of the lifting heddleijArranging a single-layer plain woven fabric around the weaving area (about 10cm distance) of the radar fabric as a transition, cutting off the single-layer plain woven fabric after weaving is finished, and obtaining the radar fabric;
when the radar fabric is woven, grid-shaped supporting bodies with the same spherical crown shape on the surfaces are placed in the areas from the corresponding cloth fell to the first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed; the number of the plurality of thin plates can be calculated according to the distance between the adjacent thin plates and the thickness of the thin plates and the width of the whole grid-shaped support body.
When the radar is woven by the fabric, each warp yarn is independently and passively sent under constant tension;
(5) by adopting an RTM (resin transfer molding) process, firstly, a mold is manufactured according to a three-dimensional model of the radar cover body, then, a plurality of layers of single-layer plain woven fabrics are placed on the mold, and phenolic resin is used as a main raw material for processing to manufacture the radar cover body;
(6) and (4) additionally arranging a radar antenna and a radar support on the radar cover body to obtain the radar.
As a preferred technical scheme:
according to the preparation method of the radar made of the composite material, the raw materials in the step (5) further contain 3-5 wt% of a curing agent (hexamethylenetetramine).
In the method for manufacturing a radar made of a composite material, the method for weaving the fabric for the radar includes the steps of forming each tissue point before weft insertion, after weft insertion or after beating-up; the thin plate is made of metal;
the tension of the warp yarns is 60-80 cN/warp yarn; the tension of the weft yarn is 20-32 cN/root;
the winding speed is 1.1-1.43 cm/min, the beating-up speed is 13-17 pieces/min, the heddle eye height of the heddle corresponding to each warp yarn is adjusted before each beating-up, and the lifting of each heddle is controlled to a certain height by independently connecting different heddles with different lifting mechanisms;
according to the preparation method of the radar made of the composite material, when each tissue point is formed, the horizontal distance from the tissue point to the heddle eyes of the first row of heddles is set to be 2-5 times of the height of the lifting heddle; the height of the lifting heddle is the height of the heddle eyes of the first row of heddles compared with the horizontal plane of the weft yarn during weft insertion.
In the preparation method of the radar made of the composite material, passive let-off refers to the adoption of a torsion spring type tension adjusting device. The bobbin-contained warps are placed on a bobbin creel, and the yarns led out from each bobbin are provided with a torsion spring type tension adjusting device, so that the tension of each warp in the let-off process can be kept constant.
The mechanism of the invention is as follows:
in the prior art, compared with a two-dimensional fabric, the three-dimensional fabric does not need to be cut and sewn during composite forming, the integrity of the fabric is improved, the composite forming process is simplified, and the prepared fabric for the radar has great superiority in the integral layering resistance, impact resistance and fatigue resistance compared with a two-dimensional woven fabric composite material.
Compared with the integrally formed three-dimensional fabric in the prior art, the plane of the weft yarn in the three-dimensional curved surface area is not parallel to each other on the integrally formed three-dimensional fabric in the prior art, and the fabric integrally presents uneven warp density and weft density in different areas, so that the uneven fabric structure can cause uneven stress on each area when the fabric is stressed; on the basis that all the warp yarns are parallel to the plane where the warp yarns of the three-dimensional curved surface area are located and all the weft yarns are parallel to the plane where the weft yarns of the three-dimensional curved surface area are located, the warp and weft densities in all the areas are uniform, and the uniform stress of the integrally-formed three-dimensional fabric is guaranteed.
In order to prepare the fabric for the radar, the grid-shaped support body is adopted to weave the fabric for the radar, compared with a special-shaped roller reeling method, in the weaving process of the special-shaped roller reeling method, the linear speed at the small end area of the special-shaped roller is smaller than the linear speed at the large end area of the special-shaped roller, so that the density of weft yarns at the small end area of the special-shaped roller is greater than that at the large end area of the special-shaped roller, and the density of weft yarns of the three-dimensional fabric prepared by the special-shaped roller reeling method cannot be uniform; the grid-shaped support body adopted by the invention is formed by arranging and combining a plurality of plane sheets at equal intervals, when in weaving, the thickness direction of the sheets is the same as the weft yarn direction, the sheets can smoothly enter between reed dents, the interval between the adjacent sheets is the interval between the adjacent reed dents of the reed, and the thickness of each sheet is smaller than 1/3 of the interval between the adjacent reed dents of the reed, so that the existence of the sheets does not influence the interweaving of yarns, the weft yarns can be arranged at equal intervals when in beating, the weft yarns are linear in the projection direction of the prepared fabric, and when in winding at a constant speed, the density of the weft yarns is uniform; the warp density is controlled by a reed, and the warp density can be ensured to be consistent by a conventional reed and a standard drafting process.
Moreover, when a single-layer plain weave fabric is arranged around the weaving area of the fabric for the radar, the warp yarns are interwoven according to a normal woven fabric weaving process; when weaving a weaving area (curved surface area) of a fabric for radar, according to the form of the curved surface area, the height of a heddle eye and the let-off quantity are controlled, and the let-off quantity increment of warp yarns in the curved surface areas with different heights is different, and the general principle is as follows: the height of the heddle eyes penetrated by the warp yarns participating in the weaving of the curved surface area is different from that of the heddle eyes penetrated by the warp yarns participating in the weaving of the plane area, and the height of the heddle eyes penetrated by the warp yarns participating in the weaving of the upper area of the curved surface area is higher than that of the heddle eyes penetrated by the warp yarns participating in the weaving of the lower area of the curved surface area; the heights of the front beam and the back beam are consistent and are kept unchanged in the weaving process, when the height of a brown eye, corresponding to the height of the front beam or the back beam, of the warp yarn is 0 when the warp yarn is returned to the heald flat position, the warp yarn and the weft yarn are interwoven to form a plane area, and when the height of the brown eye, corresponding to the height of the front beam or the back beam, of the warp yarn is not 0 when the warp yarn is returned to the heald flat position, the warp yarn and the weft yarn are interwoven to form a curved surface area.
Meanwhile, the curved fabric prepared by the grid method has better fitting degree with the designed shape, the grid-shaped support body does not need to carry out optimization in the previous design and detection and correction of the fitting degree in the later period, the excellent fitting effect can be realized, and the variety can be changed more quickly.
In addition, the grid-shaped support body adopted in the method is simple to prepare, and the special-shaped roll curling method is used for preparing the three-dimensional fabric, and the special-shaped roll corresponding to the action of the grid-shaped support body is in a three-dimensional shape, so that the processing is very complex.
In the weaving process of the fabric for the radar, the let-off is suitable for passive let-off, because the difference of the lifting heddle height of each warp yarn of the three-dimensional fabric with small curvature is small during weaving, the warp yarn with high lifting heddle height can not exceed the length adjusting space of a tension device (namely, under constant tension) in a passive let-off system because of being excessively pulled out, the process is simple, and the application range is wide. The purpose of passive let-off is to ensure that let-off quantity and tension are controllable and accurate, so as to ensure that the density of the woven three-dimensional fabric is uniform, and the technical requirement on the fit coefficient is realized under the supporting action of the grid-shaped supporting body.
Meanwhile, the curved fabric prepared by the grid method has better fitting degree with the designed shape, the grid-shaped support body does not need to carry out optimization in the previous design and detection and correction of the fitting degree in the later period, the excellent fitting effect can be realized, and the variety can be changed more quickly.
In addition, the grid-shaped support body adopted in the method is simple to prepare, and the special-shaped roll curling method is used for preparing the three-dimensional fabric, and the special-shaped roll corresponding to the action of the grid-shaped support body is in a three-dimensional shape, so that the processing is very complex.
In the weaving process of the fabric for the radar, the fabric is suitable for passive let-off, because the difference of the lifting heddle height of each warp yarn of the three-dimensional fabric with small curvature is small during weaving, the warp yarn with high lifting heddle height can not exceed the length adjusting space of a tension device (namely, under constant tension) in a passive let-off system because of being excessively pulled out, the process is simple, and the application range is wide. The purpose of passive let-off is to ensure that let-off quantity and tension are controllable and accurate, so as to ensure that the density of the woven three-dimensional fabric is uniform, and the technical requirement on the fit coefficient is realized under the supporting action of the grid-shaped supporting body.
The reinforcement in the radar prepared by the invention is an integrally formed three-dimensional fabric, the three-dimensional fabric has uniform density, is uniformly stressed when stressed, has high fitting coefficient, and does not generate interlayer difference when layers are fitted, so that compared with a spliced reinforcement, the radar can adopt a fabric with smaller weight to achieve the same performance, and is not easy to deform because the layers of the three-dimensional fabric are mutually supported along with the prolonging of the service time, thereby the receiving and feedback of electromagnetic waves can be kept stable for a long time.
Advantageous effects
(1) According to the preparation method of the radar made of the composite material, warp and weft yarns can be interwoven on a curved surface by controlling the warp yarn let-off amount and the lifting stroke, and a radar fabric with the same warp density and weft density can be prepared;
(2) according to the radar made of the composite material, the fit coefficient of the three-dimensional fabric is high, and the interlayer difference cannot be generated when the layers are fitted, so that compared with a spliced reinforcement body, the radar can adopt the fabric with smaller weight to achieve the same performance;
(3) the radar made of the composite material is not easy to deform due to mutual support among layers of the three-dimensional fabric along with the prolonging of the service time, so that the receiving and feedback of electromagnetic waves can be kept stable for a long time.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A preparation method of a radar made of a composite material comprises the following specific steps:
(1) preparation of raw materials:
warp yarn: the titer is 1200 dtex; the tensile strength of the carbon fiber is 17.8cN/dtex, and the elongation at break is 1.5%;
weft yarn: the titer is 1200 dtex; the tensile strength of the carbon fiber is 17.8cN/dtex, and the elongation at break is 1.5%;
(2) modeling: designing by adopting modeling software to obtain a three-dimensional model of the spherical-crown-shaped radar cover body with the diameter of 80 cm;
(3) establishing a space rectangular coordinate system: the plane where the bottom surface circle of the spherical crown is located is regarded as an X-Y plane, the bottom surface circle of the spherical crown is located in a first quadrant of the X-Y plane, and the convex surface of the spherical crown faces the positive direction of the Z axis; the tangent line of any point on the bottom circle of the spherical crown is an X axis, and the straight line which is vertical to the X axis and tangent to the bottom circle is a Y axis;
(4) obtaining a weave point P formed by the intersection of the ith weft yarn and the jth warp yarn (the yarn numbers i and j are positive integers)i,jHeight h of the lifting heddleij：
Taking the X-axis direction as the warp direction and the Y-axis direction as the weft direction;
the number 1 warp yarn on the X axis and the warp density lambdaWarp beam(156 pieces/10 cm) the spacing of adjacent warp yarns in the Y-axis direction forming a parallel plane to the X-axis, the parallel planes being perpendicular to the Y-axis; the intersection line formed by the parallel surface and the spherical crown is the line where the warp yarn is located;
with the 1 st weft yarn of the Y axis and with weft density lambdaWeft yarn(156 pieces/10 cm) the determined spacing of adjacent weft yarns forms parallel planes of the Y axis in the X-axis direction, the parallel planes being perpendicular to the X axis; the intersection line formed by the parallel surface and the spherical crown is the line where the weft yarn is located;
the point of intersection p formed by the thread in which the warp yarn is located and the thread in which the weft yarn is locatedi,j(xi,j,yi,j,zi,j) Is a tissue point Pi,j；
Tissue point Pi,jHeight h of the lifting heddlei,jIs zi,j(ii) a Wherein z isi,jIs an intersection point pi,jA z value in a space rectangular coordinate system; i is the serial number of the weft yarns, j is the serial number of the warp yarns, and i and j are positive integers;
(5) by adopting a plain weaving process and setting a weaving area of the radar fabric, each weave point in the weaving area of the radar fabric is formed (after beating-up)) According to a weave point P formed by the intersection of the ith weft yarn and the jth warp yarni,jHeight h of the lifting heddleijArranging a single-layer plain woven fabric around the weaving area (about 10cm distance) of the radar fabric as a transition, cutting off the single-layer plain woven fabric after weaving is finished, and obtaining the radar fabric;
when the radar fabric is manufactured, grid-shaped supporting bodies with the same spherical crown shape on the surfaces are placed in the areas from the corresponding cloth fell to the first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates (made of metal) which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed;
when the radar fabric is manufactured, a torsion spring type tension adjusting device is adopted to independently and passively send warp yarns under constant tension; the tension of the warp yarns was 66 cN/yarn; the tension of the weft yarn is 24 cN/root; the winding speed is 0.96cm/min, the beating-up speed is 15 pieces/min, the heddle eye height of the heddle corresponding to each warp yarn is adjusted before each beating-up, and the lifting of each heddle is controlled to a certain height by independently connecting different heddles with different lifting mechanisms; when each tissue point is formed, setting the horizontal distance from the tissue point to the heddle eyes of the first row of heddles to be 4 times of the height of the lifting heddle;
the fabric for the radar is a single-layer plain woven fabric formed by interweaving warp yarns and weft yarns, and the shape of the curved surface of the single-layer plain woven fabric is consistent with that of the curved surface of the radar; all warp yarns on the single-layer plain woven fabric are parallel to a plane where any warp yarn in a bent shape is located, and all weft yarns are parallel to a plane where any weft yarn in a bent shape is located; the warp density and the weft density of each part of the single-layer plain woven fabric are the same; the fit coefficient of the fabric for the radar is 98.3 percent;
(6) by adopting an RTM (resin transfer molding) process, firstly, a mold is manufactured according to a three-dimensional model of the radar cover body, then 3 layers of radar fabrics are placed on the mold, and phenolic resin and hexamethylenetetramine are used as main raw materials for processing to manufacture the radar cover body; wherein the mass content of the hexamethylenetetramine is 4 wt%;
(7) install radar antenna and radar support additional on the radome body, radar antenna is located the top of the radome body, and radar support is located the below of the radome body, obtains the radar.
The manufactured radar comprises a radar cover body, a radar antenna and a radar bracket, wherein the radar cover body is made of a composite material by taking phenolic resin as a matrix and 3 layers of radar fabrics as reinforcing phases; in the radar cover body, the content of the phenolic resin is 18 wt%; the bending strength of the radome body can reach 248MPa, the dielectric constant can reach 2.5C 2/(N.M 2), and the tensile strength can reach 550 MPa.
Claims (10)
1. A radar made of composite materials comprises a radar cover body, a radar antenna and a radar support, wherein the radar antenna is positioned above the radar cover body, and the radar support is positioned below the radar cover body; the method is characterized in that: the radar cover body is a composite material prepared by taking phenolic resin as a matrix and taking a plurality of layers of fabrics for radar as reinforcing phases;
the fabric for the radar is a single-layer plain woven fabric formed by interweaving warp yarns and weft yarns, and the shape of the curved surface of the single-layer plain woven fabric is consistent with that of the curved surface of the radar;
all warps on the single-layer plain woven fabric are parallel to the plane of any bent warp; all weft yarns on the single-layer plain woven fabric are parallel to the plane where any one bent weft yarn is located; the warp density and the weft density of each part of the single-layer plain woven fabric are the same; when the radar fabric is woven, grid-shaped supporting bodies with the same spherical crown shape on the surfaces are placed in the areas from the corresponding cloth fell to the first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed;
the radar cover body is a spherical crown with the diameter of 50-100 cm; in the radar cover body, the content of the phenolic resin is 10-20 wt%.
2. Radar made of composite material according to claim 1, characterised in that a single plain weave is usedWarp density of articleWarp beamWeft density ofWeft yarn140-160 roots/10 cm; the number of layers is 1-3.
3. A radar made of composite material according to claim 1, characterised in that the warp and weft yarns are made of carbon fibre; the tensile strength of the carbon fiber is 17.0-20.4 cN/dtex, the elongation at break is 1.5-1.8%, and the fineness is 1000-3000 dtex.
4. A radar made of a composite material according to claim 1, wherein the radar fabric has a conformity factor of 98% or more.
5. The radar made of a composite material according to claim 1, wherein the bending strength of a radar cover body can reach 242-297 MPa, the dielectric constant can reach 2.0-2.5C/(N.M), and the tensile strength can reach 500-600 MPa.
6. A method of producing a radar made of a composite material according to any one of claims 1 to 5, characterised in that it comprises the steps of:
(1) modeling: designing by adopting modeling software to obtain a three-dimensional model of the spherical-crown-shaped radome body with the diameter of 50-100 cm;
(2) establishing a space rectangular coordinate system: the plane of the bottom surface circle of the spherical crown is regarded as an X-Y plane, the spherical crown is positioned at the I th divinatory bone of the space rectangular coordinate system, and the convex surface of the spherical crown faces to the positive direction of the Z axis;
the tangent line of any point on the bottom circle of the spherical crown is an X axis, and the straight line which is vertical to the X axis and is tangent to the bottom circle is a Y axis;
(3) obtaining a weave point P formed by the intersection of the ith weft yarn and the jth warp yarni,jHeight h of the lifting heddleij：
Taking the X-axis direction as the warp direction and the Y-axis direction as the weft direction;
forming parallel surfaces of the X axis along the Y axis direction by the 1 st warp yarn of the X axis and the spacing of the adjacent warp yarns determined by the warp density, wherein the parallel surfaces are all vertical to the Y axis; the intersection line formed by the parallel surface and the spherical crown is the line where the warp yarn is located;
forming parallel planes of the Y axis along the X axis direction by the 1 st weft yarn of the Y axis and the spacing of the adjacent weft yarns determined by the weft density, wherein the parallel planes are all vertical to the X axis; the intersection line formed by the parallel surface and the spherical crown is the line where the weft yarn is located;
the point of intersection p formed by the thread in which the warp yarn is located and the thread in which the weft yarn is locatedi,j（xi,j, yi,j, zi,j) Is a tissue point Pi,j；
Tissue point Pi,jLifting heald height hi,jIs zi,j；
Wherein z isi,jIs an intersection point pi,jA z value in a space rectangular coordinate system; i is the serial number of the weft yarns, j is the serial number of the warp yarns, and i and j are positive integers;
(4) adopting a plain weaving process, setting a weaving area of the radar fabric, and forming each weave point P formed by intersecting the ith weft yarn and the jth warp yarn when forming each weave point in the weaving area of the radar fabrici,jHeight h of the lifting heddleijObtaining the fabric for the radar;
when the radar fabric is woven, grid-shaped supporting bodies with the same spherical crown shape on the surfaces are placed in the areas from the corresponding cloth fell to the first row of heddles; the grid-shaped support body is formed by connecting a plurality of thin plates which are arranged at equal intervals, the thickness direction of the thin plates is the same as the weft yarn direction, the interval between every two adjacent thin plates is the interval between every two adjacent dents of the reed, and the thickness of each thin plate is 1/3 smaller than the interval between every two adjacent dents of the reed;
when the radar is woven by the fabric, each warp yarn is independently and passively sent under constant tension;
(5) by adopting an RTM (resin transfer molding) process, firstly, a mold is manufactured according to a three-dimensional model of the radar cover body, then, a plurality of layers of single-layer plain woven fabrics are placed on the mold, and phenolic resin is used as a main raw material for processing to manufacture the radar cover body;
(6) and (4) additionally arranging a radar antenna and a radar support on the radar cover body to obtain the radar.
7. The method for preparing the radar made of the composite material according to claim 6, wherein the raw materials in the step (5) further comprise a curing agent with a mass content of 3-5 wt%.
8. The method for manufacturing a radar made of a composite material according to claim 6, wherein in the weaving method of the fabric for radar, before, after or after weft insertion at the time of forming each texture point; the thin plate is made of metal;
the tension of the warp yarns is 60-80 cN/warp yarn; the tension of the weft yarn is 20-32 cN/root;
the winding speed is 1.1-1.43 cm/min, and the beating-up speed is 13-17 pieces/min.
9. The method of claim 6, wherein the horizontal distance from the weave point to the heddle eye of the first row of heddles is 2 to 5 times the height of the lifting heddle.
10. The method of claim 6, wherein passive let-off is a torsion spring type tension adjustment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011458962.3A CN112680865B (en) | 2020-12-11 | 2020-12-11 | Radar made of composite material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011458962.3A CN112680865B (en) | 2020-12-11 | 2020-12-11 | Radar made of composite material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112680865A CN112680865A (en) | 2021-04-20 |
| CN112680865B true CN112680865B (en) | 2022-05-10 |
Family
ID=75449237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011458962.3A Active CN112680865B (en) | 2020-12-11 | 2020-12-11 | Radar made of composite material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112680865B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401840A (en) * | 2002-09-03 | 2003-03-12 | 天津工业大学 | Woven fabric and method for weaving same |
| DE602006000582T2 (en) * | 2005-06-24 | 2009-02-19 | Snecma | Mechanical part and manufacturing method of such a part |
| CN111171353A (en) * | 2020-01-17 | 2020-05-19 | 中国航空工业集团公司济南特种结构研究所 | Latent catalyst and preparation method of cyanate resin prepreg |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3615719A4 (en) * | 2017-04-28 | 2020-12-30 | Unspun, Inc. | Systems and methods for creating topographical woven fabric |
| CN111058142B (en) * | 2019-11-15 | 2021-11-19 | 南京玻璃纤维研究设计院有限公司 | Three-dimensional sandwich structure fabric and weaving method thereof |
-
2020
- 2020-12-11 CN CN202011458962.3A patent/CN112680865B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401840A (en) * | 2002-09-03 | 2003-03-12 | 天津工业大学 | Woven fabric and method for weaving same |
| DE602006000582T2 (en) * | 2005-06-24 | 2009-02-19 | Snecma | Mechanical part and manufacturing method of such a part |
| CN111171353A (en) * | 2020-01-17 | 2020-05-19 | 中国航空工业集团公司济南特种结构研究所 | Latent catalyst and preparation method of cyanate resin prepreg |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112680865A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1804174B (en) | Method for weaving fabric with Z-direction loop | |
| CN112680865B (en) | Radar made of composite material and preparation method thereof | |
| JPH03505615A (en) | Deformable textile structure | |
| CN105337026B (en) | A kind of method for weaving of the micro-strip array antenna based on Woven Distance Fabric | |
| EP1682707B1 (en) | Interlock double weave fabric and methods of making and using the same | |
| CN109800532A (en) | A kind of three-dimensional simulation method of plain fabric | |
| CN112680862B (en) | Fabric-reinforced assault boat and preparation method thereof | |
| CN112680867B (en) | Safety airbag and preparation method thereof | |
| CN112680863B (en) | 3D fabric and preparation method thereof | |
| CN112680866B (en) | Ablation material compounded by fiber cloth and preparation method thereof | |
| CN112680868B (en) | Automobile engine hood made of composite material and preparation method thereof | |
| CN113122986B (en) | Ultrahigh-density opening device | |
| Chen et al. | Engineering, manufacturing, and measuring 3D domed woven fabrics | |
| CN112680860B (en) | Laptop upper cover plate containing fabric and preparation method thereof | |
| CN212288992U (en) | High-strength three-dimensional composite eyelet fabric | |
| CN112680861B (en) | Police helmet made of composite material and preparation method thereof | |
| CN112680864B (en) | Fabric-enhanced rearview mirror and preparation method thereof | |
| CN112680859B (en) | Chair back conforming to natural physiological curvature of human spine and preparation method thereof | |
| CN112680870B (en) | Preparation method of artificial limb containing fabric | |
| CN113201842B (en) | Camouflage stealth barrier material and preparation method thereof | |
| CN115161852B (en) | Preparation method of three-dimensional woven spacer fabric for reinforcing weft yarn binding | |
| CN114672911B (en) | Shed tension model construction and tension analysis method for woven three-dimensional spacer fabric | |
| CN112680869A (en) | Preparation method of basketball containing fabric | |
| CN209816419U (en) | Light-duty high strength three-dimensional warp knitting fabric composite board structure | |
| Tayyar | Weaving and evaluation of dome-shaped fabrics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |