CN106649957A - Method for controlling deformation of metal feed waveguide in space environment - Google Patents
Method for controlling deformation of metal feed waveguide in space environment Download PDFInfo
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Abstract
The invention discloses a method for controlling deformation of a metal feed waveguide in a space environment. The method comprises the following steps of S1, determining geometric structure parameters and material attributes of the metal feed waveguide according to a satellite-borne passive planar reflective array antenna; S2, determining a structure of an elastic bracket according to a structure layout, boundary conditions and performance requirements of the metal feed waveguide; S3, building a finite element model of the metal feed waveguide according to the geometric structure parameters and the material attributes of the metal feed waveguide; S4, calculating thermal stress distribution and a thermal deformation value of the metal feed waveguide in the space environment according to constraint conditions and a thermal load environment of the metal feed waveguide; and S5, determining an elastic force range of the elastic bracket according to the thermal stress distribution and the thermal deformation value, thereby finishing deformation control of the metal feed waveguide in the space environment. According to the method, the elastic bracket is designed, so that the difficulty in heat resistance design of the metal feed waveguide is overcome and the deformation control design of the metal feed waveguide in the space environment and an emission stage can be guided.
Description
Technical field
The present invention relates to payload Antenna Construction Design field, and in particular to a kind of metal feed waveguide is in spatial environmentss
Lower shape control method.
Background technology
With the rapid development of payload antenna, to performances such as day line multi-function, multiband, remote, high powers
More and more higher is required, the requirement of satellite data transmission capacity is increasing, and the payload of satellite increases therewith.High-transmission work(
The metal feed waveguide of rate, low-loss and high reliability is used widely.
The spaceborne passive planar reflectarray antenna of certain heavy caliber adopts the rigid reflectarray antenna of empty feedback form, its feed
Relative positional accuracy between reflecting surface is higher, and the feeding classification of large transmission power, low-loss and high reliability is selected and anti-
Spatial heat environment is designed to one of difficult point of spaceborne passive planar reflectarray antenna structure-design technique.Consider Gao Gong
The requirement such as low damage characteristic, the technical maturity of Product processing molding and spaceborne product weight that rate electrical property is transmitted, spaceborne nothing
Source plane reflection array carries out electrical property transmission by the way of metal feed waveguide.
The patent documentation of Publication No. CN201857337U discloses a kind of big cover steel construction swelling heat of molten tin bath temperature-rise period
The control device of deformation, easily causes metal inside stress concentration.Non-patent literature《Helgesson Propagation in
dielectric slab loaded rectangular wave-guide》Describe external NASA Langley research centers
With the slot array that L'Garde companies cooperation research and developments is used for big mouth synthetic aperture radar (SAR) system, its feed mainly passes through
Folding and expanding rectangular waveguide is fed, but fails to consider the electromagnetism that thermal characteristic and foldable structure under spaceborne environment cause
Loss.Non-patent literature《The control analysis of folded waveguide space development longitudinal deformation》Describe a kind of using inflating thin film form system
Make waveguide, the condition such as Main Analysis waveguide internal pressure, material thickness have ignored outer to folding the impact of waveguide space deformation
Impact of portion's environmental factorss to its mechanical environment.Non-patent literature《Invar waveguide deformation analysis and control》Analyze temperature linearity
Change does not consider the technical maturity of Yin Gang waveguides to the impact using invar material waveguide transmission performance.Non-patent literature《S
Wave band weather radar scanner feeder line is designed and measurement》A aluminium section bar feed waveguide for weather radar is described, waveguide is adopted
Coordinate rotary joint with stagewise, have ignored spatial heat environment and cause waveguide deformation to cause rotary joint electromagnetic exposure etc. to affect.
Non-patent literature《Deformation affects on transmission characteristics such as trapezoidal single ridged waveguides decay》Dislocation is described with stress deformation to rectangle list
The impact of ridge ripple electric conductivity, without corresponding corrective measure.
The content of the invention
It is an object of the invention to provide a kind of metal feed waveguide shape control method under spatial environmentss, by design
Elastic support, solves the heat resistanceheat resistant design difficulty of metal feed waveguide, can instruct metal feed waveguide under spatial environmentss and send out
Penetrate the shape control design in stage.
In order to achieve the above object, the present invention is achieved through the following technical solutions：A kind of metal feed waveguide is in spatial loop
Shape control method under border, is characterized in, comprises the steps of：
S1, according to spaceborne passive planar reflectarray antenna, determine the geometrical structure parameter and material of metal feed waveguide
Attribute；
S2, the topology layout according to metal feed waveguide, boundary condition, performance requirement, determine the structure of elastic support；
S3, according to the geometrical structure parameter and material properties of metal feed waveguide, set up the finite element of metal feed waveguide
Model；
S4, the constraints according to metal feed waveguide and thermal force environment, calculate metal feed waveguide in spatial environmentss
Under thermal stress distribution and thermal deformation value；
S5, according to thermal stress distribution and thermal deformation value, the elastic force scope of elastic support is determined, to complete metal feed waveguide
Shape control under spatial environmentss.
Described spaceborne passive planar reflectarray antenna includes antenna array, support, feed and metal feed waveguide, institute
The metal feed waveguide stated is divided into four parts being sequentially connected, respectively upper surface, main paragraph, lower end flat segments and lower end
Face, wherein, described upper surface is connected with the feed, and described main paragraph is arranged along the support, and solid with the support
Fixed, lower end flat segments enter row constraint by elastic support, and lower surface is connected to stellar interior by Waveguide coaxial converter.
In described step S1, the geometrical structure parameter of metal feed waveguide is included：The sectional dimension of metal feed waveguide,
The height of metal feed waveguide, the bending angle of metal feed waveguide, the flange size of metal feed waveguide.
In described step S1, the geometrical structure parameter for determining metal feed waveguide is included：
The height of metal feed waveguide is determined away from antenna array setting height(from bottom) according to feed；
According to the contour structures of support and power feed inputs mouth position, the bending angle of metal feed waveguide and straight is determined
Segment length；
According to input electrical interface flange size, the matching flange size in metal feed waveguide port is determined；
According to the operating frequency index request of spaceborne passive planar reflectarray antenna, the interior of metal feed waveguide is calculated
Wall size, weight, the rigidity and processing technique requirement according to metal feed waveguide, determines the wall thickness of metal feed waveguide, by interior
Wall size and wall thickness determine the sectional dimension of metal feed waveguide.
In described step S1, the material properties of metal feed waveguide are included：It is the material type of metal feed waveguide, close
Degree, elastic modelling quantity, Poisson's ratio, thermal coefficient of expansion, heat conductivity and specific heat capacity.
The material type of described metal feed waveguide is the one kind in aluminium, copper material and invar.
In described step S2, elastic support is included：
Bracing frame；
Fixed plate, is arranged on the top of support frame as described above；
Transmission waveguide flange, is arranged between support frame as described above and fixed plate, and the lower end flat segments of metal feed waveguide are worn
Cross the transmission waveguide flange；
A pair of fixing screws, sequentially pass through the fixed plate, transmission waveguide flange and are connected with support frame as described above；
A pair of upper springs, are socketed in respectively in a pair of fixing screws, and positioned at fixed plate and transmission waveguide flange it
Between；
A pair of lower springs, are socketed in respectively in a pair of fixing screws, and positioned at bracing frame and transmission waveguide flange it
Between.
In described step S3, the structural finite element model of metal feed waveguide is expressed as：
In formula, M represents Mass matrix, and C represents damping battle array, and K represents Stiffness Matrix, and F represents external applied load battle array,With δ difference
Represent node acceleration, speed and displacement vector.
Described step S4 is included：
Determine the constraints of metal feed waveguide, the upper surface of metal feed waveguide is connected with feed, and main paragraph is along institute
Support setting is stated, and is fixed with the support, lower end flat segments enter row constraint by elastic support, lower surface passes through Waveguide coaxial
Converter is connected to stellar interior；
According to the working environment of spaceborne passive planar reflectarray antenna, the hot environment of metal feed waveguide, low is determined
Working time under warm environment and different temperatures environment；
Metal feed waveguide thermal stress distribution in high temperature environments and thermal deformation value, the heat under low temperature environment are calculated respectively
Stress distribution and thermal deformation value.
In described step S5, the elastic force scope for determining elastic support determines elastic support middle and upper part spring and bottom bullet
The coefficient of elasticity and its length of spring, wherein, the computing formula of coefficient of elasticity is：
S=(a+2h) (b+2h)-ab
In formula, k represents coefficient of elasticity, and the thermal deformation value under δ representation space environment, n represents safety coefficient, P representation spaces
Thermal stress under environment, S is waveguide sections product, and a represents the inwall length of metal feed waveguide, and b represents metal feed waveguide
Inwall width, h represents the wall thickness of metal feed waveguide；
The computing formula of its length is：
L=b+2h+ δ
In formula, l represents its length, and b represents the inwall width of metal feed waveguide, and h represents the wall of metal feed waveguide
Thickness, the thermal deformation value under δ representation space environment.
A kind of metal feed waveguide of present invention shape control method under spatial environmentss has compared with prior art following
Advantage：Can solve the problem that metal feed waveguide space shape control problem, can be used for solve metal feed waveguide under spatial environmentss
Mechanical design and heat resistanceheat resistant design difficulty, can instruct metal feed waveguide under spatial environmentss and launching phase deformation control
Set up meter.
Description of the drawings
Fig. 1 is a kind of flow chart of metal feed waveguide shape control method under spatial environmentss of the invention；
Fig. 2 is the space structure layout of metal feed waveguide；
Fig. 3 is metal feed waveguide section size schematic diagram；
Fig. 4 is the axonometric chart of the elastic support installed in metal feed waveguide lower end flat segments；
Fig. 5 is the profile of elastic support.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, a kind of metal feed waveguide shape control method under spatial environmentss, comprises the steps of：
S1, according to spaceborne passive planar reflectarray antenna, determine the geometrical structure parameter and material of metal feed waveguide
Attribute.
As shown in Fig. 2 spaceborne passive planar reflectarray antenna comprising antenna array, support 1 (carbon fibre material is made),
Feed 2 and metal feed waveguide 3, respectively described 3 points of four parts to be sequentially connected of metal feed waveguide, upper surface
31st, main paragraph 32, lower end flat segments 33 and lower surface 34, wherein, described upper surface 31 is connected (upper surface with the feed 2
The flange of flange and Feed Horn be connected by screw), described main paragraph 32 is arranged along the support 1, and with described
Frame 1 is fixed (pricked by line and fixed), and lower end flat segments 33 enter row constraint by elastic support 4, and lower surface 34 passes through Waveguide coaxial
Converter is connected to stellar interior.
The geometrical structure parameter of metal feed waveguide is included：The sectional dimension of metal feed waveguide, metal feed waveguide
Highly, the bending angle of metal feed waveguide, the flange size of metal feed waveguide.
The geometrical structure parameter for determining metal feed waveguide is included：
The height of metal feed waveguide is determined away from antenna array setting height(from bottom) according to feed；
According to the contour structures of support and power feed inputs mouth position, the bending angle of metal feed waveguide and straight is determined
Segment length；
According to input electrical interface flange size, the matching flange size in metal feed waveguide port is determined；
According to the operating frequency index request of spaceborne passive planar reflectarray antenna, the interior of metal feed waveguide is calculated
Wall size, weight, the rigidity and processing technique requirement according to metal feed waveguide, determines the wall thickness of metal feed waveguide, by interior
Wall size and wall thickness determine the sectional dimension of metal feed waveguide.As shown in Figure 3.
The material properties of metal feed waveguide are included：The material type of metal feed waveguide, density, elastic modelling quantity, Poisson
Than, thermal coefficient of expansion, heat conductivity and specific heat capacity.
The material type of conventional metal feed waveguide be aluminium, copper material and invar in one kind, according to material technology into
The strict demand of ripe degree and Satellite Product to quality, makes metal feed waveguide, its material from aluminium in the present embodiment
Attribute is as shown in table 1.
Table 1
S2, the topology layout according to metal feed waveguide, boundary condition, performance requirement, determine the structure of elastic support.
Such as Fig. 5, and with reference to shown in Fig. 3 and Fig. 4, elastic support 4 includes bracing frame 41 (aluminum)；Fixed plate 42, is arranged on
The top of support frame as described above 41；Transmission waveguide flange 43, is arranged between support frame as described above 41 and fixed plate 42, metal feed ripple
The lower end flat segments 33 led pass through the transmission waveguide flange 43；A pair of fixing screws 44, sequentially pass through the fixed plate 42, pass
Defeated waveguide flange 43 is connected with support frame as described above 41；A pair of upper springs 45, are socketed in respectively in a pair of fixing screws 44, and
Between fixed plate 42 and transmission waveguide flange 43；A pair of lower springs 46, are socketed in respectively in a pair of fixing screws 44, and
And between bracing frame 41 and transmission waveguide flange 43.A pair of upper springs 45 and a pair of lower springs 46 have certain bullet
Power, reaches the effect that can be adjusted up and down.Spaceborne passive planar reflectarray antenna is exposed to outside celestial body, and temperature environment is more
Badly, during hot environment, the downward deformation that the thermal expansion of metal feed waveguide 3 causes, upper springs 45 are stretched, lower springs 46 are received
Contracting, when spaceborne passive planar reflectarray antenna is in low temperature environment, it is upwardly-deformed that the hot shrinkage of metal feed waveguide 3 causes,
Upper springs 45 are shunk, lower springs 46 are stretched.Elastic support 4 ensure that metal feed waveguide axially a range of freedom
Ductility, improves the physical characteristics expanded with heat and contract with cold under the mechanical and space environment of metal feed waveguide again.Transmission wave
The spacing of inducing defecation by enema and suppository orchid 43 is c, and its length of upper springs 45 (lower springs 46) is l, and the thickness of fixed plate 42 is e, is transmitted
The height of waveguide flange 43 is f, and the height of bracing frame 41 is g+d+i.
S3, according to the geometrical structure parameter and material properties of metal feed waveguide, set up the finite element of metal feed waveguide
Model.
The structural finite element model of metal feed waveguide is expressed as：
In formula, M represents Mass matrix, and C represents damping battle array, and K represents Stiffness Matrix, and F represents external applied load battle array,With δ difference
Represent node acceleration, speed and displacement vector.
S4, the constraints according to metal feed waveguide and thermal force environment, calculate metal feed waveguide in spatial environmentss
Under thermal stress distribution and thermal deformation value.
Determine the constraints of metal feed waveguide, the upper surface of metal feed waveguide is connected with feed, and main paragraph is along institute
Support setting is stated, and is fixed with the support, lower end flat segments enter row constraint by elastic support, lower surface passes through Waveguide coaxial
Converter is connected to stellar interior；
According to the working environment of spaceborne passive planar reflectarray antenna, the hot environment of metal feed waveguide, low is determined
Working time under warm environment and different temperatures environment；
Metal feed waveguide thermal stress distribution in high temperature environments and thermal deformation value, the heat under low temperature environment are calculated respectively
Stress distribution and thermal deformation value.
Thermal force environment is mainly the temperature environment of alternating hot and cold (- 110 DEG C～+110 DEG C).
S5, according to thermal stress distribution and thermal deformation value, the elastic force scope of elastic support is determined, to complete metal feed waveguide
Shape control under spatial environmentss.
According to stress distribution F and deformation values δ, with reference to safety coefficient n of waveguide design, elastic support spring (top is calculated
Spring and lower springs) elastic force scope (0～nF) and elongation or decrement, by Hooke theorem calculate the elastic coefficient k and
Its length l.Wherein, according to stress, with reference to Hooke's law, the computing formula of coefficient of elasticity is：
S=(a+2h) (b+2h)-ab
In formula, k represents coefficient of elasticity, and the thermal deformation value under δ representation space environment, n represents safety coefficient, P representation spaces
Thermal stress under environment, S is waveguide sections product, and a represents the inwall length of metal feed waveguide, and b represents metal feed waveguide
Inwall width, h represents the wall thickness of metal feed waveguide；
The computing formula of its length is：
L=b+2h+ δ
In formula, l represents its length, and b represents the inwall width of metal feed waveguide, and h represents the wall of metal feed waveguide
Thickness, the thermal deformation value under δ representation space environment.
Screw length should be greater than 2l+e+f+g.
Specifically, under spatial environmentss under aluminium section bar metal feed waveguide spatial environmentss thermal stress P maximum be 1.24 ×
106Pa, thermal deformation value δ maximum is 0.88mm, brings formula into and can be calculated：K=30.2N/mm.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of metal feed waveguide shape control method under spatial environmentss, it is characterised in that comprise the steps of：
S1, according to spaceborne passive planar reflectarray antenna, determine the geometrical structure parameter and material properties of metal feed waveguide；
S2, the topology layout according to metal feed waveguide, boundary condition, performance requirement, determine the structure of elastic support；
S3, according to the geometrical structure parameter and material properties of metal feed waveguide, set up the FEM (finite element) model of metal feed waveguide；
S4, the constraints according to metal feed waveguide and thermal force environment, calculating metal feed waveguide is under spatial environmentss
Thermal stress distribution and thermal deformation value；
S5, according to thermal stress distribution and thermal deformation value, the elastic force scope of elastic support is determined, to complete metal feed waveguide in sky
Between shape control under environment.
2. shape control method as claimed in claim 1, it is characterised in that described spaceborne passive planar reflectarray antenna
Comprising antenna array, support, feed and metal feed waveguide, described metal feed waveguide is divided into four portions being sequentially connected
Divide, respectively upper surface, main paragraph, lower end flat segments and lower surface, wherein, described upper surface is connected with the feed, institute
The main paragraph stated is arranged along the support, and is fixed with the support, and lower end flat segments enter row constraint, lower end by elastic support
Face is connected to stellar interior by Waveguide coaxial converter.
3. shape control method as claimed in claim 1, it is characterised in that in described step S1, metal feed waveguide
Geometrical structure parameter is included：The sectional dimension of metal feed waveguide, the height of metal feed waveguide, the bending of metal feed waveguide
The flange size of angle, metal feed waveguide.
4. the shape control method as described in claim 1 or 3, it is characterised in that in described step S1, determines that metal feeds
The geometrical structure parameter of waveguide is included：
The height of metal feed waveguide is determined away from antenna array setting height(from bottom) according to feed；
Contour structures and power feed inputs mouth position according to support, determine that the bending angle and flat segments of metal feed waveguide is long
Degree；
According to input electrical interface flange size, the matching flange size in metal feed waveguide port is determined；
According to the operating frequency index request of spaceborne passive planar reflectarray antenna, the inwall chi of metal feed waveguide is calculated
Very little, the weight, rigidity and processing technique according to metal feed waveguide is required, the wall thickness of metal feed waveguide is determined, by inwall chi
Very little and wall thickness determines the sectional dimension of metal feed waveguide.
5. shape control method as claimed in claim 1, it is characterised in that in described step S1, metal feed waveguide
Material properties are included：The material type of metal feed waveguide, density, elastic modelling quantity, Poisson's ratio, thermal coefficient of expansion, heat conductivity
And specific heat capacity.
6. shape control method as claimed in claim 5, it is characterised in that the material type of described metal feed waveguide is
One kind in aluminium, copper material and invar.
7. shape control method as claimed in claim 2, it is characterised in that in described step S2, elastic support is included：
Bracing frame；
Fixed plate, is arranged on the top of support frame as described above；
Transmission waveguide flange, is arranged between support frame as described above and fixed plate, and the lower end flat segments of metal feed waveguide pass through institute
State transmission waveguide flange；
A pair of fixing screws, sequentially pass through the fixed plate, transmission waveguide flange and are connected with support frame as described above；
A pair of upper springs, are socketed in respectively in a pair of fixing screws, and between fixed plate and transmission waveguide flange；
A pair of lower springs, are socketed in respectively in a pair of fixing screws, and between bracing frame and transmission waveguide flange.
8. shape control method as claimed in claim 1, it is characterised in that in described step S3, metal feed waveguide
Structural finite element model is expressed as：
In formula, M represents Mass matrix, and C represents damping battle array, and K represents Stiffness Matrix, and F represents external applied load battle array,Section is represented respectively with δ
Point acceleration, speed and displacement vector.
9. shape control method as claimed in claim 2, it is characterised in that described step S4 is included：
Determine the constraints of metal feed waveguide, the upper surface of metal feed waveguide is connected with feed, and main paragraph is along described
Frame is arranged, and is fixed with the support, and lower end flat segments enter row constraint by elastic support, and lower surface is converted by Waveguide coaxial
Device is connected to stellar interior；
According to the working environment of spaceborne passive planar reflectarray antenna, hot environment, the low temperature ring of metal feed waveguide are determined
Working time under border and different temperatures environment；
Metal feed waveguide thermal stress distribution in high temperature environments and thermal deformation value, the thermal stress under low temperature environment are calculated respectively
Distribution and thermal deformation value.
10. shape control method as claimed in claim 7, it is characterised in that in described step S5, determine elastic support
Elastic force scope determines the coefficient of elasticity and its length of elastic support middle and upper part spring and lower springs, wherein, coefficient of elasticity
Computing formula be：
S=(a+2h) (b+2h)-ab
In formula, k represents coefficient of elasticity, the thermal deformation value under δ representation space environment, and n represents safety coefficient, P representation space environment
Under thermal stress, S is waveguide sections product, and a represents the inwall length of metal feed waveguide, and b represents the inwall of metal feed waveguide
Width, h represents the wall thickness of metal feed waveguide；
The computing formula of its length is：
L=b+2h+ δ
In formula, l represents its length, and b represents the inwall width of metal feed waveguide, and h represents the wall thickness of metal feed waveguide, δ
Thermal deformation value under representation space environment.
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Cited By (1)
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| CN112164883A (en) * | 2020-08-21 | 2021-01-01 | 西安空间无线电技术研究所 | Layered feed structure for maintaining pressure between sub-layers in temperature-varying environment |
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| CN104615836A (en) * | 2015-02-12 | 2015-05-13 | 西安电子科技大学 | Rapid prediction method for impact of spaceborne microstrip antenna array thermal deformation on electrical performance |
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