CN108417991A - It is a kind of for annular truss formula reflector can synchronous expansion ring beam - Google Patents
It is a kind of for annular truss formula reflector can synchronous expansion ring beam Download PDFInfo
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- CN108417991A CN108417991A CN201810074048.5A CN201810074048A CN108417991A CN 108417991 A CN108417991 A CN 108417991A CN 201810074048 A CN201810074048 A CN 201810074048A CN 108417991 A CN108417991 A CN 108417991A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
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Abstract
The present invention propose it is a kind of for annular truss formula reflector can synchronous expansion ring beam, belong to satellite antenna technical field, it is formed by connecting by circumferentially distributed multiple identical basic quadrilateral units, each basic quadrilateral units include two vertical poles, two cross bars, a brace and two identical synchronous expansion mechanisms；Each synchronous expansion mechanism includes a slide hinge of mating setting, a synchronization rope and three pulleys；Slide hinge is located on a vertical pole, and the slide hinge and the T-type hinge on another vertical pole are connected with the both ends of a cross bar by revolute pair respectively；First pulley and second pulley be fixed on slide hinge and both with it is synchronous rope it is tangent, third pulley is fixed on the T-type hinge of another vertical pole；Synchronous rope one end is fixed on the vertical pole anchor tip of a vertical pole, and the other end is connected after bypassing three pulleys successively with the slide hinge on another vertical pole.The present invention has the characteristics that simple in structure, synchronism is good, synchronous rope length and tension value are kept constant.
Description
Technical field
The invention belongs to satellite antenna technical field, be related to it is a kind of for annular truss formula reflector can synchronous expansion ring
Beam.
Background technology
It is increasingly improved recently as demands such as communication and surveies of deep space, the bore of satellite antenna gradually increases.However by
To the limitation in rocket launching space, need to develop the satellite antenna that can be unfolded.Annular truss formula is deployable (to be interpreted as both opening up
Opening can also collapse) reflector Astromesh (United States Patent (USP) NO.5680145) be Satellite Unfurlable Antenna typical case successfully represent
One of, have the advantages that light weight, rigidity are big, shrinkage ratio is big and easily spreads out.Reflector Astromesh is by extensible
Ring beam and the wire side two parts supported by the ring beam form, and wherein annular reflector may be implemented from state is collapsed to deployed condition in ring beam
Transformation (after presently, annular reflector is fully deployed, the state will be maintained always).Specifically, ring beam is circumferentially
The periodic structure of distribution is formed by connecting by each identical quadrilateral units, and quadrilateral units may be implemented to collapse and be unfolded,
Referring to Fig. 1, wherein figure (a) is the pilot process configuration schematic diagram of ring beam expansion, figure (b) is the configuration signal that ring beam is fully deployed
Figure.According to the difference of tucked way, annular reflector can be divided into generation configuration (abbreviation AM1) and two generation configurations (abbreviation AM2).
The distinguishing feature of AM2 is that the mode slided along vertical pole which employs slide hinge realizes the reduction for collapsing height, in identical coke
Diameter collapses height than lower AM2 reduces by 40% than AM1.In view of rocket transport space is limited, height smaller when AM2 is collapsed, therefore
AM2 is suitable for the more bigbore annular reflector of realization.
Ring beam is opened up for the annular reflector of two generation configurations, referring to (c), (d) in Fig. 1, each four side in ring beam
Shape unit is each vertical respectively including 2 parallel isometric vertical poles (3 and 9), 2 isometric cross bars (6 and 11) and 1 brace 12
Bar both ends are respectively fixed with a vertical pole anchor tip (1 and 7) and a T-type hinge (4 and 10), and on two vertical poles (3 and 9)
Vertical pole anchor tip and T-type hinge are arranged diagonal, and the both ends of brace 12 are connected with 1 T-type hinge by revolute pair respectively.
The basic quadrilateral units of each of ring beam are rectangle when fully unfolded position.The key of ring beam expansion is each quadrangle
Unit is intended to synchronous expansion, that is, ensures that each basic quadrilateral units movement is consistent.For this purpose, each basic in existing ring beam
Be additionally provided with two synchronous expansion mechanisms in quadrilateral units, each synchronous expansion mechanism by one group of synchronous rope around pulley come
Ensure that adjacent slide hinge slides identical distance on vertical pole.(lower-left is located at for one of synchronous expansion mechanism
Side) for, specifically include mating setting the synchronous rope 13 of a slide hinge 2, one and two pulleys (5 and 14), in addition one
A synchronous expansion mechanism (being located at upper right side) is similar；Each slide hinge is located on 1 vertical pole, can be along corresponding vertical pole
Lower slider；Each slide hinge and the T-type hinge on another vertical pole are connected with the both ends of corresponding cross bar by revolute pair respectively；
Two pulleys are separately fixed on the T-type hinge and slide hinge being connected from different vertical poles；Lower synchronous rope 13 is at two inflection points
Two pulleys 5 and 14 are bypassed respectively, and it is solid that 13 one end of lower synchronous rope are fixed on left slide hinge 2, the other end is fixed on right vertical pole
Determine on connector 7.The arrangement of upper synchronous rope 16 is similar to lower synchronous rope 13 with winding.In basic quadrilateral units by collapsing to expansion
Motion process in, the cornerite of each pulley (synchronous central angle corresponding with the contact arc length of pulley of restricting) is understood be subtracted by about 180 degree
As low as about 90 degree, it is contemplated that the size of pulley be can not ignore, and the length of whole synchronous rope can change during expansion.Such as
Fruit synchronizes rope and is tensioned when collapsing state, can gradually relax during expansion, to weaken synchronous effect significantly, therefore cannot be guaranteed
The Movement consistency of each quadrilateral units, ring beam is even resulted in when serious to be fully deployed.
Invention content
The present invention be in order to overcome the shortcoming of prior art, provide it is a kind of for annular truss formula reflector can be same
Step expansion ring beam, it can be achieved that each basic quadrilateral units of ring beam synchronous expansion, have the characteristics that form simply, be easily achieved.
Purpose to realize the present invention adopts the following technical scheme that：
It is a kind of for annular truss formula reflector can synchronous expansion ring beam, it is multiple identical basic by what is be circumferentially distributed
Quadrilateral units are formed by connecting, and each basic quadrilateral units are respectively including two vertical poles, two cross bars, a brace and two
Identical synchronous expansion mechanism, each vertical pole both ends are respectively fixed with a vertical pole anchor tip and a T-type hinge, and two vertical poles
On vertical pole anchor tip and T-type hinge be arranged diagonal, the both ends of brace pass through revolute pair phase with a T-type hinge respectively
Even；Adjacent two basic quadrilateral units share a vertical pole, and two basic quadrilateral units are arranged symmetrically about the vertical pole；
Each synchronous expansion mechanism includes that a slide hinge of mating setting, the synchronous of fixed rope length are restricted and three
A pulley；Wherein, the slide hinge is located on vertical pole, and is slided up and down along the vertical pole, the slide hinge and positioned at another
T-type hinge on one vertical pole is connected with the both ends of a cross bar by revolute pair respectively；First pulley and second pulley are fixed on
On the slide hinge and both tangent with synchronous rope, third pulley is fixed on the T-type hinge of another vertical pole, the synchronization
Rope one end is fixed on the vertical pole anchor tip of a vertical pole, the other end bypass successively after three pulleys with the cunning on another vertical pole
Dynamic hinge is connected；
The setting of three pulleys also needs to meet claimed below：The second pulley and third pulley radius are equal；Described
The center of circle of two pulleys and third pulley is overlapped with the center of rotation at a cross bar both ends respectively；The center of circle of the second pulley and phase
Answer the horizontal distance of cross bar closer than first pulley, at the same time the center of circle of second pulley and corresponding vertical pole upper vertical bar anchor tip
Vertical distance is closer than first pulley, and first pulley to the direction of synchronous rope between corresponding vertical pole upper vertical bar anchor tip is slided with first
Take turns, third pulley to another vertical pole on slide hinge between synchronous rope parallel with the vertical pole to the synchronous direction restricted between second pulley
Direction it is parallel with another vertical pole；
Geometric centroid in a center of symmetry arrangement of two synchronous expansion mechanisms about the basic quadrilateral units.
The beneficial effects of the invention are as follows：
It is proposed by the present invention it is a kind of for annular truss formula reflector can synchronous expansion ring beam, pass through improve synchronous expansion
Mechanism, the synchronous length restricted does not change with the variation of basic quadrilateral units configuration during ensureing annular reflector expansion,
Therefore each slide hinge generates identical displacement in ring beam, so that it is guaranteed that the synchronism of each basic quadrilateral units movement.
The present invention has the characteristics that simple in structure, synchronism is good, synchronous rope rope length and tension value are kept constant.
Description of the drawings
Fig. 1 is existing Astromesh bis- generations configuration (AM2) ring beam expanded schematic diagram, and figure (a) is the intermediate mistake of ring beam expansion
Journey configuration schematic diagram, figure (b) are the configuration schematic diagram that ring beam is fully deployed, and figure (c) is the knot of basic quadrilateral units in figure (a)
Structure schematic diagram, figure (d) are the structural schematic diagrams of basic quadrilateral units in figure (b).
Fig. 2 is the structural schematic diagram of ring beam basic quadrilateral units under rounding state of the present invention.
Fig. 3 is the structural schematic diagram of ring beam basic quadrilateral units under fully unfolded position of the present invention.
Fig. 4 is the sliding distance of two slide hinges in left and right of the present embodiment.
Fig. 5 is two synchronous rope length degree variations up and down of the present embodiment.
Fig. 6 is the curve graph of the skidding distance of the present embodiment and the difference of transmission range.
Specific implementation mode
Annular truss formula reflector proposed by the present invention can synchronous expansion ring beam combination accompanying drawings and embodiments furtherly
It is bright as follows：
It is proposed by the present invention it is a kind of for annular truss formula reflector can synchronous expansion ring beam, it is more by what is be circumferentially distributed
The identical basic quadrilateral units of a structure are formed by connecting, and each basic quadrilateral units include respectively two parallel isometric vertical
Bar, two isometric cross bars and a brace, each vertical pole both ends are respectively and fixedly connected with that there are one vertical pole anchor tips and T-type hinge
Chain, and vertical pole anchor tip on two vertical poles and T-type hinge are arranged diagonal, the both ends of brace respectively with a T-type hinge
It is connected by revolute pair；Adjacent two basic quadrilateral units share a vertical pole, and two basic quadrilateral units are about the vertical pole
It is arranged symmetrically；Each basic quadrilateral units also include two identical synchronous expansion mechanisms, each synchronous expansion mechanism respectively
The synchronization of a slide hinge, a fixed rope length including mating setting is restricted and three pulleys；Slide hinge is located at one
On vertical pole, and it can be slided up and down along the vertical pole；The slide hinge and T-type hinge on another vertical pole respectively with a cross bar
Both ends be connected by revolute pair, first pulley and second pulley be fixed on the slide hinge of a vertical pole and both with together
Step rope is tangent, and third pulley is fixed on the T-type hinge of another vertical pole, and the vertical pole that synchronous rope one end is fixed on a vertical pole is fixed
On connector, the other end is connected after bypassing three pulleys successively with the slide hinge on another vertical pole；The setting of three pulleys also needs
Meet claimed below：(1) second pulley and third pulley radius are equal；(2) center of circle of second pulley and third pulley respectively with
The center of rotation at a piece cross bar both ends overlaps；(3) center of circle of second pulley is closer than first pulley with the horizontal distance of corresponding cross bar,
At the same time the center of circle of second pulley is closer than first pulley with the vertical distance of corresponding vertical pole upper vertical bar anchor tip, and first slides
Wheel to parallel with the vertical pole with the direction of first pulley to synchronous rope between second pulley between a vertical pole upper vertical bar anchor tip,
The direction of synchronous rope is parallel with another vertical pole between slide hinge on third pulley to another vertical pole；Two synchronous expansion mechanisms close
In the geometric centroid of basic quadrilateral units arrangement in a center of symmetry.
Annular truss formula reflector of the present invention can synchronous expansion ring beam, basic quadrilateral units be unfolded motion process
In, improved synchronous expansion mechanism can ensure that each section of synchronous rope is parallel with corresponding cross bar and vertical pole difference；Synchronous rope bypasses
The cornerite of pulley on slide hinge close to vertical pole remains constant, and perseverance is 180 degree；Synchronous rope bypasses T-type hinge top sheave
Cornerite the increase of degree is unfolded with basic quadrilateral units and is gradually reduced, but around the pulley far from vertical pole on slide hinge
Cornerite with basic quadrilateral units be unfolded degree increase and gradually increase, can geometrically prove the sum of above-mentioned two cornerite
Perseverance is 180 degree, and therefore, synchronous rope total length can keep constant constant during expansion.Annular truss formula reflector is unfolded
When, the slide hinge of side is moved to vertical pole top by the medium position of vertical pole, therefore under the action of synchronous restrict, the other side
Slide hinge can also move identical distance.In view of each basic quadrilateral units have composed in series whole ring beam, the synchronization
Unfolding mechanism can ensure that the slide hinge on every vertical pole can move identical distance, to make the expansion of each unit
Journey keeps synchronizing, and the tension value of synchronous rope remains unchanged.When basic quadrilateral units are in deployed condition, synchronous rope is sliding
Cornerite (central angle contact portion arc length corresponding to) of the hinge on the pulley of cross bar is equal to 90 degree.
Embodiment：
The concrete structure of the present embodiment is as shown in Figure 2 and Figure 3.Fig. 2 is annular truss formula reflector Astromesh shown in Fig. 1
The transition state (in collapsing between state and deployed condition) for opening up a basic quadrilateral units in ring beam of second generation configuration, Fig. 3
For the deployed condition of a basic quadrilateral units.The component of one basic quadrilateral units includes parallel isometric 3 He of left vertical pole
Right vertical pole 9, isometric sheer pole 6 and cross tube 11 and 1 brace 12,3 both ends of left vertical pole are respectively fixed with upper vertical bar and fix
Connector 1 and lower T-type hinge 4,9 both ends of right vertical pole are respectively fixed with lower vertical bar anchor tip 7 and upper T-type hinge 10, and two vertical poles
Vertical pole anchor tip and T-type hinge on (3 and 9) are arranged diagonal, and the both ends of brace 12 pass through with 1 T-type hinge respectively
Revolute pair is connected.Each basic quadrilateral units also include two identical synchronous expansion mechanisms, each synchronous expansion machine respectively
Structure includes a slide hinge of mating setting, the synchronous rope of fixed rope length and three pulleys, now with one of synchronous
It is described in detail for unfolding mechanism.Slide hinge 8 is located on right vertical pole, and can be slided up and down along the vertical pole, the sliding hinge
Chain and the T-type hinge 4 on left vertical pole 3 are connected with the both ends of sheer pole 6 by revolute pair respectively, and pulley 15 and pulley 14 are equal
It is fixed on the slide hinge 8 of right vertical pole 9 and both tangent with synchronous rope 13, pulley 5 is fixed on the T-type hinge 4 of right vertical pole 3
On, 13 one end of synchronous rope are fixed on the vertical pole anchor tip 7 of right vertical pole 9, and the other end is indulged after bypassing three pulleys successively with a left side
Slide hinge 2 on bar 3 is connected, and (specifically, 13 other ends of synchronous rope are first parallel to right vertical pole 9 upwards, then pass around sliding hinge
It is downward to switch to be parallel to right vertical pole 9 after pulley 15 on chain 8, switchs to be parallel to sheer pole 6 to the left further around pulley 14 is crossed, then around
Switch to be parallel to left vertical pole 3 after the pulley 5 crossed on T-type hinge 4 upwards, finally fixed with slide hinge 2), to ensure synchronous rope
Length during expansion is constant, and the settings of three pulleys also meets claimed below：(1) pulley 14 is equal with 5 radius of pulley,
The radius of pulley 15 is not required for equal with the holding of pulley 5 and 14；(2) center of circle of pulley 14 and pulley 5 respectively with 6 liang of sheer pole
The center of rotation at end overlaps；(3) center of circle of pulley 14 is closer than 15 pulleys with the horizontal distance of sheer pole 6, at the same time pulley 14
The center of circle and right vertical pole 9 on vertical pole anchor tip 7 vertical distance it is closer than pulley 15.And on pulley 15 to right vertical pole 9
Between the vertical pole anchor tip 7 and direction of pulley 15 to synchronous rope between pulley 14 is parallel with right vertical pole 9, on pulley 5 to left vertical pole 3
The direction of synchronous rope is parallel with left vertical pole 3 between slide hinge 2.Specifically, the center location of pulley 15 is located at the upper right of pulley 14
Side, pulley 15 need to make the synchronous rope 13 between two pulleys keep flat with right vertical pole 9 relative to the horizontal direction position of pulley 14
The position of row, the vertical direction of pulley 15 need to only be located at 14 top of pulley, and specific size is not required for；Two synchronous expansions
Geometric centroid in a center of symmetry arrangement of the mechanism about the basic quadrilateral units, the set-up mode of another synchronous rope 16 with it is synchronous
It restricts 13 similar, details are not described herein again.In actual work, the sliding along vertical pole of slide hinge is the driving rope controlled by motor
It realizes, but this does not ensure that each slide hinge slides identical distance along vertical pole, it is therefore desirable to above-mentioned synchronous expansion machine
Structure ensures that each slide hinge slides identical distance, and then ensures the synchronism of each basic quadrilateral units expansion of ring beam.
Since synchronous rope driving mechanism and above-mentioned synchronous expansion mechanism are independent onrelevants, driving machine is no longer described in detail here
The implementation of structure.
The size of each component is as follows in the present embodiment：Ring beam is circumferentially connected by 6 basic quadrilateral units and is formed, ring beam
Bore is 2 meters when being fully deployed, and each long 530.2mm of cross bar, each long 1384.7mm of vertical pole, each pulley radius is 7mm；T-type is cut with scissors
The mounting distance of two pulleys is 97mm on chain；4 pulleys need to be installed altogether on slide hinge and (supply two adjacent quadrilateral units
Using), it can symmetrically be divided into two groups according to about slide hinge center line, the mounting distance of close to each other one group of two pulley is
The mounting distance of 69mm, two pulleys of another set are 97mm；The length of two synchronous ropes is 1970.9mm.Each composition portion
Part is conventional parts.
Embodiment validation verification：
Synchronous rope that rope length during expansion proposed by the present invention remains unchanged is verified by emulating first around pulley side
The validity of case.A basic quadrilateral units are established, initial time is in fully unfolded position, applies to slide hinge 2
Displacement drive makes it be slided gradually downward from top along left vertical pole 3.Under the action of synchronous restrict, 8 meeting of slide hinge on right side
Upward sliding, to make basic quadrilateral units gradually collapse.The sliding distance of slide hinge 2 and slide hinge 8 is at any time
Fig. 4 is shown in variation, it can be seen that the two displacement is consistent.Later, continue to apply displacement drive to slide hinge 2, make it along a left side
Vertical pole 3 is from the gradual upward sliding in bottom end, under the action of synchronous restrict, the meeting slide downward of slide hinge 8 on right side, to make the base
This quadrilateral units is gradually until be fully deployed.Two slide hinges 2 and 8 slide on vertical pole during quantitative statistics expansion
Distance, as shown in Figure 4, it can be seen that two slide hinges 2 and 8 can guarantee identical displacement during entire expansion,
It can ensure the synchronism of movement.In addition, also having counted the length of synchronous 16 rope synchronous with downside 13 of rope in upside during expansion
The situation of change of degree, as shown in Figure 5.It can be seen that the length of synchronous rope can remain unchanged during expansion.
Later, it is active displacement drive end to be followed successively by 0 to 6, No. 0 slide hinge to slide hinge number, remaining each point is equal
Passive movement under the action of synchronous restrict, measures the displacement Δ of each slide hingei, i=1,2 ..., 5.Slide hinge moves
Vernier caliper measurement when amount is less than 150mm, amount of measurement error are about ± 1mm；Tape measure when more than 150mm is measured and is missed
Residual quantity is about ± 2mm.Active drive end makes the displacement Δ on No. 0 sliding hinge0Increasing to 686mm from 0 first, (ring beam is received
Hold together the stage), then it is decreased to 0mm (ring beam stages of deployment) from 686mm.To have found out 1-5 slide hinges according to measurement result
The difference of the displacement of displacement and No. 0 input terminal slide hinge, the results are shown in Figure 6.As can be seen that maximum differential is happened at exhibition
ON state, there are about 10mm, movement intermediate state maximum differential is about 6mm.In view of the error for being machined and assembling, it can be seen that this
Invention has good synchronism in an experiment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, and non-limiting protection scope of the present invention, all in this hair
Any modification made within bright spirit and principle, equivalent replacement, improve etc., in the protection scope of the present invention for including.
Claims (1)
1. it is a kind of for annular truss formula reflector can synchronous expansion ring beam, by be circumferentially distributed multiple identical basic four
Side shape unit is formed by connecting, and each basic quadrilateral units include respectively two vertical poles, two cross bars, a brace and two phases
Same synchronous expansion mechanism, each vertical pole both ends are respectively fixed with a vertical pole anchor tip and a T-type hinge, and on two vertical poles
Vertical pole anchor tip and T-type hinge be arranged diagonal, the both ends of brace pass through revolute pair phase with a T-type hinge respectively
Even；Adjacent two basic quadrilateral units share a vertical pole, and two basic quadrilateral units are arranged symmetrically about the vertical pole；It is special
Sign is：
Each synchronous expansion mechanism includes a slide hinge of mating setting, the synchronous rope of fixed rope length and three respectively
Pulley；Wherein, the slide hinge is located on vertical pole, and is slided up and down along the vertical pole, the slide hinge and positioned at another
T-type hinge on vertical pole is connected with the both ends of a cross bar by revolute pair respectively；First pulley and second pulley are fixed on institute
It states on slide hinge and both tangent with synchronous rope, third pulley is fixed on the T-type hinge of another vertical pole, the synchronous rope
One end is fixed on the vertical pole anchor tip of a vertical pole, the other end bypass successively after three pulleys with the sliding on another vertical pole
Hinge is connected；
The setting of three pulleys also needs to meet claimed below：The second pulley and third pulley radius are equal；Described second slides
The center of circle of wheel and third pulley is overlapped with the center of rotation at a cross bar both ends respectively；The center of circle of the second pulley and corresponding cross
The horizontal distance of bar is closer than first pulley, and at the same time the center of circle of second pulley and corresponding vertical pole upper vertical bar anchor tip is vertical
Distance is closer than first pulley, and first pulley to the direction of synchronous rope between corresponding vertical pole upper vertical bar anchor tip with first pulley extremely
The direction of synchronous rope is parallel with the vertical pole between second pulley, the synchronous side to restrict between slide hinge on third pulley to another vertical pole
To parallel with another vertical pole；
Geometric centroid in a center of symmetry arrangement of two synchronous expansion mechanisms about the basic quadrilateral units.
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| CN201810074048.5A CN108417991B (en) | 2018-01-25 | 2018-01-25 | Synchronously-deployable ring beam for annular truss type reflector |
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| CN201810074048.5A CN108417991B (en) | 2018-01-25 | 2018-01-25 | Synchronously-deployable ring beam for annular truss type reflector |
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| EP3683888A1 (en) * | 2019-01-16 | 2020-07-22 | Eagle Technology, LLC | Compact storable extendible member reflector |
| CN111864393A (en) * | 2020-07-28 | 2020-10-30 | 清华大学 | High-storage-ratio annular expandable mesh antenna |
| CN114256589A (en) * | 2021-11-23 | 2022-03-29 | 清华大学 | Annular truss type space deployable mechanism |
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| CN111864393A (en) * | 2020-07-28 | 2020-10-30 | 清华大学 | High-storage-ratio annular expandable mesh antenna |
| CN111864393B (en) * | 2020-07-28 | 2022-11-04 | 清华大学 | High-storage-ratio annular expandable mesh antenna |
| CN114256589A (en) * | 2021-11-23 | 2022-03-29 | 清华大学 | Annular truss type space deployable mechanism |
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