CN101179157B - Large-scale radio telescope active reflecting plane common drive parallel mechanism array - Google Patents
Large-scale radio telescope active reflecting plane common drive parallel mechanism array Download PDFInfo
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- CN101179157B CN101179157B CN2007101773083A CN200710177308A CN101179157B CN 101179157 B CN101179157 B CN 101179157B CN 2007101773083 A CN2007101773083 A CN 2007101773083A CN 200710177308 A CN200710177308 A CN 200710177308A CN 101179157 B CN101179157 B CN 101179157B
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Abstract
The invention belongs to the components of a large radio telescope, especially relates to a co-driving parallel mechanism array on an active reflector of a large radio telescope with the number of the control nodes reduced and the control difficulty decreased. N parallel mechanical units are distributed and fixed on a base by the distribution of equilateral triangle, thus forming the co-driving parallel mechanism array on the active reflector of the large radio telescope. An active telescopic driver unit drives three adjacent reflector units at the same time, implementing the coupling amongst the reflector units. The regular hexagon reflector units of the N parallel mechanical units fit into the rotating parabolic reflector. The parallel mechanical array of the invention can reduce the number of the driving motor by 2/3, and decrease control difficulty; the engineering cost is reduced with one constraint branched chain reduced on each reflector. The rotating parabolic reflector can be fitted out via the parallel mechanism array, thus solidifying the need for large scale surface fitting.
Description
Technical field
The invention belongs to large-scale radio telescope active reflecting plane driving mechanism scope altogether, be particularly related to and a kind ofly can reduce drive motors quantity, reduce control difficulty and engineering cost, satisfied the large-scale radio telescope active reflecting plane common drive parallel mechanism array of surface fitting requirement on a large scale.
Background technology
Large-scale radio telescope is the main research tool of radio astronomy, in order to receive the radio signal of the various wave bands that the universe celestial body sends.At astronomy and even in fields such as earth environment problem, Solar Physics and military affairs, large-scale radio telescope is also being brought into play irreplaceable effect.Ripe gradually along with astronomical demand and radio technology, countries in the world are competitively built the radio telescope that performance, structure, scale have nothing in common with each other.The Arecibo that the present fixed single antenna radio telescope of maximum caliber in the world is the U.S..It is installed in the A Leixibo observatory of U.S. Puerto Rico, and bore reaches 366 meters, receives the radio signal of superhigh frequency band.Its observed result has effectively been verified the conclusion of Einstein's general theory of relativity about gravitational radiation, and this is achieved in 1993 and obtains the Nobel Prize.The lunar surface addressing of famous Apollo program is also finished by it.Zui Da followed the tracks of of parabolic radio telescope is near the institute of the Ai Feier Regensburg radio astronomy the Bonn, Germany in the world.100 meters of its bores also are operated in superhigh frequency band.Hold the 24th international wireless electricity section at kyoto, Japan in 1993 and joined (URSI) meeting, the astronomer in the world and day roentgenologist x propose to build follow-on big radio telescope, simultaneously it has been proposed following requirement: low cost, big sky covers, broadband and polarization observation.The ten state radiostronomers that comprise China unite the proposal of having initiated to make up the big radio telescope of a new generation, propose to establish the huge radio telescope that receiving area reaches a square kilometre.
Under the subsidy of Chinese Academy of Sciences's knowledge innovation project, Beijing Observatory and international cooperation person are advancing and building the reflecting surface bore in China Guizhou Province is 500 meters large-scale radio telescope FAST (Five-hundred-meter-aperture spherical telescope), as guide's project of the world big radio telescope array plan.The Science magazine is twice report FAST project successively, it serves to show its scientific meaning.China also will add world's radio telescope net plan as the main observation station of south east asia.
The design bore of FAST is 500 meters, and radius of curvature is 300 meters, and maximum operating frequency is the 5G hertz, and has the zenith scan angle of 60 degree, improves an order of magnitude than present existing radio telescope in the world on its combination property.But the cost of making large-scale radio telescope is extremely expensive, and the Arecibo telescope of the U.S. has spent more than one hundred million dollars.Therefore, the Chinese science man has carried out deep research in the reflecting surface configuration aspects, proposes initiatively reflecting surface strategy.Wherein a kind of method is with the whole active reflecting surface of nearly 1800 hexagon spheric reflection unit splicing becoming, every reflecting surface is fixed in the depression by driving supporting mechanism, can make every spherical reflective surface carry out in the direction of the centre of sphere that the position is adjusted and certain inclination angle adjustment by the control supporting mechanism, the illumination section real-time fitting of feed is become an instantaneous parabola.This scheme has corrected the spherical aberration problem that spherical reflective surface occurs, and has simplified feed, has overcome the narrow band effect that spherical reflective surface causes, and has reduced the manufacturing cost of FAST.
Reaching the scientific goal of FAST---observation 5G hertz electromagnetic wave, therefore the error of fitting root-mean-square value of reflecting surface unit should need the effective control of realization to each piece reflector element in 4 millimeters.But because the quantity of reflecting surface unit is very big, the quantity of Control Node is also just very big, brings certain difficulty to control, and this just need reduce Control Node quantity effectively by driving mechanism.Simultaneously, how simplifying driving mechanism also is the major issue that must consider to reduce manufacturing cost.
Summary of the invention
The purpose of this invention is to provide a kind of novel common drive parallel mechanism array that can be used for large-scale radio telescope active reflecting plane, it is characterized in that: the N of described large-scale radio telescope active reflecting plane common drive parallel mechanism array parallel institution unit (N:1200-2000) distributes by equilateral triangle and is fixed in pedestal 7, and the regular hexagon reflecting surface unit 1 of N parallel institution unit fits to the rotation parabolic reflector.
The parallel institution unit comprises 3 active branched chain, a regular hexagon reflecting surface unit 1, and the support bar 3 in each active branched chain is connected with reflecting surface unit 1 by ball pivot 2.In addition two support bars 3 of active branched chain are connected with adjacent two reflecting surface unit 1 respectively by ball pivot 2.
Active branched chain is made of active telescopic drive unit 6,5,3 revolute pairs of supporting seat 4, three support bars 3, three ball pivots 2, initiatively the lower end and the pedestal 7 of telescopic drive unit 6 are affixed, the upper end is affixed with supporting seat 5, and three support bars 3 are connected with supporting seat 5 by three revolute pairs 4 respectively.
Initiatively telescopic drive unit 6 drives 3 adjacent reflecting surface unit 1 simultaneously by supporting seat 5, revolute pair 4, support bar 3, ball pivot 2, realizes the coupling of reflecting surface unit 1 and peripheral reflection face unit.
Initiatively telescopic drive unit 6 adopts electric structure.Initiatively telescopic drive cell enclosure 8 is fixed on the pedestal 7, and drive motors 12 is fixedlyed connected with shell 8.Decelerator 13 1 ends connect motor 12, and other end connection leading screw 11 passes to leading screw 11 with motor 12 drivings after slowing down, and nut 9 is affixed with carriage release lever 10, and leading screw 11 drives nut 9 and carriage release lever 10 generations move up and down, and realization is stretching motion initiatively.
The active telescopic drive unit that the invention has the beneficial effects as follows 1. each active branched chain of the present invention drives three adjacent reflecting surface unit simultaneously, makes the decreased number 2/3 of driver element, and array element is closed chain mechanism in parallel, has higher rigidity; 2. the present invention uses revolute pair to replace the ball pivot of prior art, for each reflector element has reduced by a treaty bundle branch chain, has reduced the cost that mechanism makes and installs.That has realized that background technology proposes effectively reduces the Control Node number, simplifies driving mechanism to reduce the requirement of project cost.
Description of drawings
Fig. 1 is a large-scale radio telescope active reflecting plane common drive parallel mechanism array general illustration.
Fig. 2 is the schematic diagram of parallel institution unit.
Fig. 3 is the structure chart of active telescopic drive unit.
Embodiment
The invention provides a kind of large-scale radio telescope active reflecting plane common drive parallel mechanism array.Large-scale radio telescope active reflecting plane common drive parallel mechanism array general illustration as shown in Figure 1, N parallel institution unit (N:1200-2000) distributes by equilateral triangle and is fixed in pedestal 7, constitutes the large-scale radio telescope active reflecting plane common drive parallel mechanism array.The regular hexagon reflecting surface unit 1 of N parallel institution unit fits to the rotation parabolic reflector.
In Fig. 2, the parallel institution unit comprises three active branched chain, a regular hexagon reflecting surface unit 1, and the support bar 3 in each active branched chain is connected with reflecting surface unit 1 by ball pivot 2.In addition two support bars 3 of active branched chain are connected with adjacent two reflecting surface unit 1 respectively by ball pivot 2.
Active branched chain is made of active telescopic drive unit 6, supporting seat 5, three revolute pairs 4, three support bars 3, three ball pivots 2, initiatively the lower end and the pedestal 7 of telescopic drive unit 6 are affixed, the upper end is affixed with supporting seat 5, and three support bars 3 are connected with supporting seat 5 by three revolute pairs 4 respectively.
Initiatively telescopic drive unit 6 drives 3 adjacent reflecting surface unit 1 simultaneously by supporting seat 5, revolute pair 4, support bar 3, ball pivot 2, realizes the coupling of reflecting surface unit 1 and peripheral reflection face unit.
In Fig. 3, initiatively the structure of telescopic drive unit 6 is an electric structure.Initiatively telescopic drive cell enclosure 8 is fixed on the pedestal 7, drive motors 12 is fixedlyed connected with shell 8, decelerator 13 1 ends connect motor 12, the other end connects leading screw 11, motor 12 drivings are passed to leading screw 11 after slowing down, nut 9 is affixed with carriage release lever 10, and leading screw 11 drives nut 9 and carriage release lever 10 generations move up and down, and realizes initiatively stretching motion.
Operation principle of the present invention is: form space closed chain mechanism in parallel by three active branched chain between pedestal 7 and reflector element 1.When three initiatively telescopic drive unit 6 carries out stretching motion, by three supporting seats 5, three revolute pairs 4, three support bars 3, three ball pivots 2 drive reflector element 1 simultaneously, reflector element is produced along the vertical motion of z axle with around the rotation of x, y axle, by the amounts of exercise of three actives of control telescopic drive unit 6, just can control the match campaign of this reflector element 1 like this.When parallel mechanism array carries out the match campaign, three revolute pairs that each active telescopic drive unit connects by supporting seat, three support bars, three ball pivots drive three adjacent reflector element motions simultaneously, just pass through ball pivot 2, support bar 3, revolute pair 4 between so any reflecting surface unit and the peripheral reflection face unit, supporting seat 5 is coupled, and finishes the match campaign of whole active reflecting surface.
Claims (2)
1. large-scale radio telescope active reflecting plane common drive parallel mechanism array, be fixed in pedestal (7) by N parallel institution unit by the equilateral triangle distribution, the regular hexagon reflecting surface unit (1) of N parallel institution unit fits to the rotation parabolic reflector, N is 1200～2000, described parallel institution unit comprises 3 active branched chain, a described regular hexagon reflecting surface unit (1), one of them support bar (3) of every active branched chain is connected with described regular hexagon reflecting surface unit (1) by ball pivot (2), in addition two described support bars (3) of described active branched chain are connected with adjacent two described regular hexagon reflecting surface unit (1) respectively by described ball pivot (2), described active branched chain is by active telescopic drive unit (6), supporting seat (5), three described support bars (3) and three described ball pivots (2) constitute, the lower end of described active telescopic drive unit (6) and described pedestal (7) are affixed, the upper end is affixed with described supporting seat (5), it is characterized in that support bar described in the described active branched chain (3) is connected with described supporting seat (5) by revolute pair (4).
2. according to the described large-scale radio telescope active reflecting plane common drive parallel mechanism array of claim 1, its feature also is: the shell (8) of described active telescopic drive unit (6) is fixed on the described pedestal (7), drive motors (12) is fixedlyed connected with described shell (8), decelerator (13) one ends connect described drive motors (12), the other end connects leading screw (11), described drive motors (12) driving is passed to described leading screw (11) after slowing down, nut (9) is affixed with carriage release lever (10), described leading screw (11) drives described nut (9) and described carriage release lever (10) generation moves up and down, and realizes initiatively stretching motion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101773083A CN101179157B (en) | 2007-11-14 | 2007-11-14 | Large-scale radio telescope active reflecting plane common drive parallel mechanism array |
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| CN2007101773083A CN101179157B (en) | 2007-11-14 | 2007-11-14 | Large-scale radio telescope active reflecting plane common drive parallel mechanism array |
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| CN101179157B true CN101179157B (en) | 2011-01-26 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2973168B1 (en) * | 2011-03-24 | 2013-05-17 | Thales Sa | ACTUATING SYSTEM FOR ANTENNA REFLECTOR WITH DEFORMABLE REFLECTIVE SURFACE |
| CN102324625B (en) * | 2011-06-08 | 2013-08-07 | 中国科学院国家天文台南京天文光学技术研究所 | Active reflector structure of radio telescope |
| CN103490140B (en) * | 2013-09-22 | 2015-07-15 | 中国科学院国家天文台 | Large radio telescope with reflective surface unit self-adaptation connecting interface |
| CN104779440B (en) * | 2015-04-17 | 2017-09-12 | 北京航空航天大学 | A kind of intelligent three-dimensional programmable antenna reflecting surface |
| CN105227124B (en) * | 2015-09-24 | 2018-02-16 | 苏州绿豆豆软件科技有限公司 | A kind of optically focused conveyer and its implementation based on speculum |
| CN106992352B (en) * | 2017-03-06 | 2019-03-19 | 中国科学院国家天文台 | A kind of radio telescope FAST levoform open-and-close mechanism |
| CN107901026B (en) * | 2017-11-07 | 2021-01-08 | 燕山大学 | Two-rotation one-movement three-freedom-degree parallel mechanism based on less-input array output |
| CN110137659B (en) * | 2019-05-22 | 2023-07-18 | 南京吉凯微波技术有限公司 | Folding assembling and disassembling structure and method for vehicle-mounted large-caliber radar antenna |
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