CN1748342A - Expansion-type reflection mirror - Google Patents
Expansion-type reflection mirror Download PDFInfo
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- CN1748342A CN1748342A CN 200480003640 CN200480003640A CN1748342A CN 1748342 A CN1748342 A CN 1748342A CN 200480003640 CN200480003640 CN 200480003640 CN 200480003640 A CN200480003640 A CN 200480003640A CN 1748342 A CN1748342 A CN 1748342A
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Abstract
The invention provides an deployable reflecting mirror provided with a connecting device which is spanned among a plurality of telescopic components forming an extensive truss to connect a part corresponding to an antinode of a buckling mode and a part corresponding to a node of the buckling mode, wherein, the buckling mode is generated on the telescopic components when tensile force is applied to a surface cable. Moreover, the surface cable consists of an inside surface cable and a peripheral surface cable combined on the periphery of the inner surface cable, wherein, a cable with high rigidity, small variation in length caused by variation of tensile force is used as the inside surface cable, and a cable with rigidity lower than that of the inside surface cable and small variation of tensile force caused by the variation of length is used as the peripheral surface cable. The inside surface cable receives the tensile force from the extensive truss through the peripheral surface cable, thereby forming a predetermined mirror shape.
Description
Technical field
The present invention relates to be loaded on the artificial satellite etc. with folding state, and the expansion-type reflection mirror that it is launched in the cosmic space.It is very little to be particularly related under folding state shared volume, and forms the expansion-type reflection mirror of reservation shape under deployed condition.
Background technology
When the deployable antenna on will being loaded into artificial satellite etc. is transported on the cosmic space, use rockets such as inferior sharp Anna, H-IIA.But the goods spatial accommodation of rocket is restricted owing to its space, thereby when transporting large-scale deployable antenna, is received in the rocket under with its state that folds very for a short time, and this deployable antenna is launched after rocket arrives the cosmic space again.Constituting in the middle of the expansion-type reflection mirror of this deployable antenna, it is that a plurality of basic structures are made up that a kind of speculum is arranged, and constitutes large-scale deployable antenna according to the quantity of this basic structure.
Figure 13 shows the structure example of expansion-type reflection mirror in the past, and wherein (a) is the integrally-built perspective view that expansion-type reflection mirror is shown, and (b) is the decomposition diagram of an example that the basic structure of expansion-type reflection mirror is shown.Among the figure, the basic structure of expansion-type reflection mirror is made of the cable network 100 of hanging up metal grill, stand-off 105, expanded truss 106.The cable network 100 of having hanged up metal grill is installed on the expanded truss 106 by stand-off 105, is polyhedron, and makes the surface of expansion-type reflection mirror be approximately predetermined parabolic shape.Expanded truss 106 can launch and draw in, by under deployed condition stand-off 105 being held in a predetermined position, makes cable network 100 be tensioning state and the predetermined parabolic shape of formation.
Figure 14 is the decomposition diagram that the detailed structure of cable network 100 is shown.Among the figure, the cable network is broken down into surperficial cable 101, metal grill 102, connects cable 103 and back side cable 104.
For the mirror shape that obtains to be scheduled to, adjust the length of cable and make while measure the shape that forms surperficial cable 101 during fabrication, when being in the precalculated position, stand-off obtains the shape of expectation thus.
Figure 15 is used to illustrate the figure that forms the operation of mirror shape when the expansion-type reflection mirror of making in the past with predetermined accuracy.Among the figure, in order during fabrication minute surface to be formed predetermined shape, surperficial cable 101 and back side cable 104 are applied tension force laterally, thereby launching to measure its shape under the state of minute surface, and the operation of adjusting the length of warping winch that connects cable 103 repeatedly is till reaching predetermined form accuracy.For example, measure shape during fabrication, and when surperficial cable 101 when paraboloidal upside departs from, force down surperficial cable 101 by shorten connecting cable 103, make it near predetermined shape.Because in a single day shape is to determine by the tensioning state of cable, and shortens certain cable, tensioning state will change, and once can't reach reservation shape so only adjust.Therefore, measure deviation, and be the length adjustment that each tie point 110 repeats to connect cable 103, surperficial cable 101 is adjusted to preposition, thereby guarantee shape by shape measure.
At this moment,, be configured on the direction of crossing surperficial cable 101, connect the adjustment amount of length of warping winch and the corresponding relation between the mirror shape with increase with connecting cable 103 for the ease of adjusting.In addition, by using rigidity cable low, that the caused length variations of tension variation is bigger to constitute surperficial cable 101, and use rigidity height, the cable that the caused length variations of tension variation is little constitute back side cable 104, be constructed as follows structure: promptly, as shown in figure 15, when changing the length that connects cable 103, mainly changed surperficial cable 101 and be connected to the position that connects on the cable 103.
Figure 16 is the perspective view that other structure example of expansion-type reflection mirror in the past are shown.Among the figure, cable network 201 constitutes by rigidity height, cable that the caused length variations of tension variation is little, and the support cable 202 low by rigidity, that the caused length variations of tension variation is bigger supports.Support cable 202 and be installed on the intumescent film surface 203, thereby be formed in intumescent film surface 203 because the structure of 201 one-tenth tensioning states of cable network under the state that importing air etc. expand.
Figure 17 illustrates the perspective view of other structure example of expansion-type reflection mirror in the past.Figure 18 is a decomposition diagram of representing each member in other structure example of expansion-type reflection mirror in the past.Among the figure, expansion-type reflection mirror constitutes by the cable network 100 that plays the antenna reflective face effect with as the expanded truss 106 of skeleton structure.Described cable network 100 is constituted, and is supported on the expanded truss 106 by a plurality of stand-offs 105 by surperficial cable 101, metal grill 102, connection cable 103, back side cable 104.
This expanded truss 106 is made of eight planar linkage mechanisms 107 that form trapezoidal shape.These planar linkage mechanisms 107 with the mode of Sharing Center's spindle unit 108 be radial quilt evenly be configured in these central shaft parts 108 around; by slide hinge 109 is slided along the direction of axis line of central shaft parts 108, can draw in or launch expanded truss 106 (order deceive, three benevolence, peace rattan and shows: モ ジ ュ one Le
ケ one Block Le メ ッ シ ユ Zhan Open Agencies makes I Ru Da Xing Wei star communication ア Application テ ナ Agencies Building, the Electricity feelings Reported B-II of Communications Society and divides Books " the little special collection of inferior Shi Dai Wei star Tong Xin Ji Intraoperative " the Theory Wen Chi of soft-shelled turtle feelings Reported Communications Society, B-II.Vol.j76-B-II, No.5,1993, pp.476-484).
In the telescopic drive of planar linkage mechanism, use and be configured in expanded truss loop-forming cable on every side.This cable is connected the top ends of each planar linkage mechanism with can move freely, thereby adjusts the coiling amount of cable by the rotation of motor, thereby makes the planar linkage mechanism synchronization telescope.
Yet the cable network 100 in the expansion-type reflection mirror in the past is made of the cable with flexible softness, is to keep the shape of antenna reflective face with self strength.Therefore, make its upper surface be approximately paraboloidal mode expanded truss 106 and form approximate spherical shape, and hang up cable network 100 by stand-off 105 thereon, thus cable network 100 is maintained parabolic shape with minimal error.
But when using the method, the shape of cable network 100 depends on the shape of expanded truss 106 to a great extent.Therefore, have high-precision mirror surface accuracy, need to increase the rigidity of expanded truss 106 so that it can bear the tension force of cable network 100 in order to make cable network 100.But,, need carry out overstriking to each parts that constitutes expanded truss, thereby have the problem that overall weight increases in order to increase the rigidity of expanded truss 106.
In addition, in expansion-type reflection mirror in the past, because the thermal deformation of expanded truss 106, the factors such as shape representation when launching, apply tension force to cable network 100 and will be shifted with the position of the stand-off 105 that supports.Consequently, the poised state of cable network 100 changes, and each length of warping winch changes, thereby causes shape to change.Therefore, the sensitivity of the distortion of support section is very high relatively, thereby need form supporting construction accurately.Particularly, from the difficulty or ease angle of adjusting, because back side cable has used rigidity height, cable that the caused length variations of tension variation is little, so, the slight variation of stand-off position will cause very big tension variation, and makes the tension force of each cable under the poised state change, and then cause the length variations of surperficial cable, consequently caused forming the problem that the mirror shape of surperficial cable changes greatly.
On the other hand, in the expansion-type reflection mirror of in the past use intumescent film surface, the intumescent film surface is made of film, so that can launch or draw in.Therefore, the tension force of stretching minute surface causes the distortion of intumescent film surface easily, and be difficult to predict the behavior of membrane structure thing, thereby be difficult to prediction its with respect to the position deviation that is positioned at away from the power supply of position, this means the problem of the effect that has been difficult to speculum.
Particularly, when constituting speculum, under the state that film surface expands, can't correctly determine the position of minute surface part with the intumescent film surface.In addition, owing to be subjected to the influence of gravity on the ground, be very important, but be difficult to dope accurately the shape of film surface with present analytical technology so wait predicting shape by the state of weightlessness on the analysis satellite orbit.Especially, expansion-type reflection mirror self need support in some way, but has the problem that is difficult to predict the position relation between Support Position and the minute surface when the support film surface.
The objective of the invention is to realize the in light weight and big expansion-type reflection mirror of expansion-type reflection mirror than in the past, the expansion-type reflection mirror that is achieved as follows simultaneously, this expansion-type reflection mirror can reduce minute surface part with respect to by applying the distortion sensitivity of tension force with the Support Position of the expanded truss that supports the cable network, and can reduce the bending moment force on the expanded truss of being applied to that produces in order to apply tension force to the cable network.
Summary of the invention
In the expansion-type reflection mirror of first invention, apply tension force so that its expanded truss that is deployed condition comprises a plurality of extensible members, extending apparatus, hookup mechanism to the cable network.A plurality of extensible members are linked to respectively on a plurality of periphery fixing points, and can stretch on its direction of axis line, and wherein said a plurality of periphery fixing points are to be provided at predetermined intervals for its circumferencial direction on the outer peripheral portion of surperficial cable.Extending apparatus stretches a plurality of extensible members, and with the peripheral direction expansion of a plurality of periphery fixing points to surperficial cable, thereby apply tension force so that its expansion to surperficial cable.Hookup mechanism is set up between a plurality of extensible members, links the pairing part of antinode and the pairing part of node of buckling mode (buckling mode), and described buckling mode is when producing on extensible member when surperficial cable applies tension force.
Thus, the displacement of the antinode institute counterpart of the buckling mode that produces on the extensible member of expanded truss is limited owing to linking with the pairing part of node, thereby suppressed the flexing itself that produces on the extensible member, can prevent that the flexing of expanded truss from damaging.
In the expansion-type reflection mirror of second invention, thereby as the cable network that the stretching, extension by expanded truss is subjected to tension force to become deployed condition have with a plurality of leg-of-mutton each summit as the surperficial cable of tie point, be installed on the surperficial cable to be connected to back side cable on the surperficial cable as the metal grill of reflection of electromagnetic wave film and by a plurality of connection cables, it forms with triangle under deployed condition is the polyhedral structure of a unit, and can fold.In addition, the surface cable is made of inner surface cable and the outer surface cable that is combined on its periphery, the inner surface cable has used rigidity height, cable that the caused length variations of tension variation is little, and the outer surface cable has used with the inner surface cable and compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
If the cable network of minute surface part that constitutes expansion-type reflection mirror is owing to expanded truss is in tensioning state, then it is taken as polyhedron-shapedly, and this polyhedron-shaped length by each leg-of-mutton three limits that constitute the inner surface cable is unique definite.At this moment,, the polyhedron-shaped deflection of minute surface can be suppressed to be approximately, thereby mirror can be suppressed and the deflection of part by suppressing the length variations of inner surface cable.
In structure of the present invention, constitute the outer surface cable by the cable low with rigidity, that the caused tension variation of length variations is little, make the displacement of expanded truss be absorbed, thereby suppressed the tension variation of minute surface part by the outer surface cable.Therefore, can reduce distortion sensitivity for the displacement of expanded truss.On the other hand, expanded truss there is no need correctly to keep the Support Position of cable network, as long as apply tension force, thereby can relax for the designing requirement condition.In addition, the variation of analyses and prediction expanded truss easily, and can predict that also its positional precision with respect to the antenna power supply, this antenna power supply are is integral at the aspect of performance of determining minute surface, has improved designed reliability thus.
The expansion-type reflection mirror of the 3rd invention constitutes by making up following two kinds of structures, one of them structure is the structure of adding hookup mechanism on expanded truss in first invention, and another structure is the structure of having used soft outer surface cable with respect to the inner surface cable in second invention.
The 4th invention is the expansion-type reflection mirror as first invention, wherein, uses cable as hookup mechanism.
The 5th invention is as the expansion-type reflection mirror of the 4th invention, wherein, is furnished with the storing apparatus that holds cable.
The 6th invention is as the described expansion-type reflection mirror of arbitrary invention in first to the 3rd invention, wherein, is provided with expanded truss between surperficial cable and back side cable.
The 7th invention is the expansion-type reflection mirror as first invention, wherein, as connecting cable and back side cable, has used with surperficial cable and has compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
The 8th invention is as the described expansion-type reflection mirror of first invention, and wherein, surperficial cable is constituted as and is approximate parabolic upon deployment.
The 9th invention is as the described expansion-type reflection mirror of the second or the 3rd invention, wherein, as connecting cable and back side cable, has used with the inner surface cable and has compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
The tenth invention is as the described expansion-type reflection mirror of the second or the 3rd invention, and wherein, the inner surface cable is constituted as and is approximate parabolic upon deployment.
Description of drawings
Fig. 1 is the perspective view of structure example (1) that expansion-type reflection mirror of the present invention is shown;
Fig. 2 is the synoptic diagram that the structure example of framework 2 is shown;
Fig. 3 is the synoptic diagram that the structure example of planar linkage 3 is shown;
Fig. 4 is the synoptic diagram that the structure of metal wire drive unit 11 is shown;
Fig. 5 is the perspective view that the intermediateness of expanded truss 53 expansion or gathering is shown;
Fig. 6 is the perspective view that the rounding state of expanded truss 53 is shown;
Fig. 7 is the perspective view that the feature structure of expanded truss 53 in the expansion-type reflection mirror of the present invention is shown;
Fig. 8 is the synoptic diagram of structure example that the storing apparatus of cable 15 is shown;
Fig. 9 is the synoptic diagram of structure example that the storing apparatus of cable 15 is shown;
Figure 10 is the decomposition diagram that the feature structure of cable network 51 in the expansion-type reflection mirror of the present invention is shown;
Figure 11 is the perspective view of structure example (2) that expansion-type reflection mirror of the present invention is shown;
Figure 12 is the curve chart that experimental result is shown;
Figure 13 shows the structure example of expansion-type reflection mirror in the past, wherein, (a) is the integrally-built perspective view that expansion-type reflection mirror is shown, and (b) is the decomposition diagram of an example that the basic structure of expansion-type reflection mirror is shown;
Figure 14 is the decomposition diagram that the detailed structure of cable network 100 is shown;
Figure 15 is used to illustrate the figure that forms the operation of mirror shape when the expansion-type reflection mirror of making in the past with predetermined accuracy;
Figure 16 illustrates the perspective view of other structure example of expansion-type reflection mirror in the past;
Figure 17 illustrates the perspective view of other structure example of expansion-type reflection mirror in the past;
Figure 18 illustrates the decomposition diagram of each member of other structure example of expansion-type reflection mirror in the past.
Embodiment
Fig. 1 is the perspective view of structure example (1) that expansion-type reflection mirror of the present invention is shown.Among the figure, the expansion-type reflection mirror of this structure example has formed mirror shape by cable network 51 is hanged up on expanded truss 53 through stand-off 52.For example, when cable network 51 was used as the speculum of the large-scale deployable antenna of installing on the communication satellite with reservation shape, minute surface was partly got parabolic shape, and received the transmission electromagnetic wave by the power supply (not shown) that is arranged at the focal position.
Each bottom that expanded truss 53 connects a plurality of (being six here) framework 2 (extensible member) is configured to radial, and can be that the point of rotation folds or launches with the bottom.Shared smaller volume under folding rounding state forms predetermined shape under the deployed condition.On the top ends of each framework 2 of expanded truss 53 stand-off 52 is set, the top ends of this stand-off 52 is connected on the peripheral part of cable network 51.Expanded truss 53 applies tension force to the surperficial cable that constitutes cable network 51 under deployed condition, and is approximated to predetermined curved surface by a plurality of triangular multi-face bodies that surperficial cable forms.This polyhedral curve form is applied the length decision on each limit of triangle under the state by tension force.
Fig. 2 shows the synoptic diagram of the structure example of framework 2.Among the figure, framework 2 is made of a plurality of (being five here) planar linkage 3.Each planar linkage 3 is set up in parallel along the direction of axis line of framework 2, links each other between the adjacent planar connecting rod 3, to constitute mirror-image structure with putting the cart before the horse.
Fig. 3 shows the synoptic diagram of the structure example of planar linkage 3.Among the figure, planar linkage 3 has first connecting rod 4a～the 5th connecting rod 4e.First connecting rod 4a～the 5th connecting rod 4e is made of the hollow circular shaft that profile and thickness equate, its length is set to the value of determining separately.Wherein, first connecting rod 4a～the 4th connecting rod 4d links by rotary gemel 5, thereby constitutes the chain link of rectangle frame shape, and side disposes the 5th connecting rod 4e within it.
The end of the 5th connecting rod 4e can be attached at by rotary gemel 6 on the end of first connecting rod 4a with rotating freely, and another end is attached on the third connecting rod 4c relative with first connecting rod 4a slidably by slide hinge 7.In addition, the 5th connecting rod 4e and slide hinge 7 rotatably link by rotary gemel 8.
The metal wire 9 of annular is connected on the precalculated position of slide hinge 7.This metal wire 9 is hung between the truckle 10 of the direction of axis line both sides that are arranged at third connecting rod 4c respectively by volume, and the intermediate portion is kept by metal wire drive unit 11 (extending apparatus).
Fig. 4 shows the synoptic diagram of the structure of metal wire drive unit 11.Among the figure, metal wire drive unit 11 has motor 12, and has fixed large pulley 13 on its driving shaft.Metal wire 9 is twisted on the large pulley 13, by motor 12 rotation large pulleys 13, metal wire 9 is advanced on the direction of axis line of third connecting rod 4c with slide hinge 7 or retreats.
In planar linkage shown in Figure 33, if slide hinge 7 is moved on the direction of axis line of third connecting rod 4c, then the 5th connecting rod 4e rotates around rotary gemel 6 in the inboard by first connecting rod 4a～chain link that the 4th connecting rod 4d constitutes, thereby the first connecting rod 4a that is linked on the 5th connecting rod 4e is moved towards the direction that the direction of axis line with third connecting rod 4c tilts.That is, shown in solid line among Fig. 3 and chain-dotted line, planar linkage 3 is changed with respect to the length of the direction of axis line (left and right directions among Fig. 3) of framework 2.On the other hand because framework 2 is joined into adjacent plane connecting rod 3 and constitutes mirror-image structure each other, thereby by moving the slide hinge 7 of each planar linkage 3, can as Fig. 5 and shown in Figure 6 launch or draw in expanded truss 53.
In addition, in the said structure example, when framework 2 is stretched, used the metal wire drive unit 11 that slide hinge 7 is moved as its drive unit, but be not limited thereto, for example, also can be in the rotary gemel 5,6,8 that constitutes planar linkage 3, at it all or link the driving shaft of motor on the part, thus constitute the structure of flexible planar linkage 3.
Fig. 7 shows the perspective view of the feature structure of expanded truss 53 in the expansion-type reflection mirror of the present invention.Among the figure, many (being the six roots of sensation here) cables 15 (hookup mechanism) between adjacent framework 2, have been set up.These cables 15 link up the part corresponding with the node of the buckling mode that produces on the framework 2 between adjacent framework 2 each other, and part that will be corresponding with the node of buckling mode and link up with the corresponding part of antinode.
Here in Jia She the buckling mode, because the top ends of each framework 2 becomes node, mid portion becomes antinode, thus with two cables 15 with the top ends of adjacent frame 2 one-tenth cross-like connected to each other, and the top ends and the pars intermedia of adjacent frame 2 connected to cross-like respectively with two cables 15.In addition, Fig. 5 shows the state of the cable 15 in expanded truss 53 expansion midway.
Fig. 8 and Fig. 9 show the synoptic diagram of structure example of the storing apparatus of cable 15.Among the figure, the storing apparatus of cable 15 is drums 50 that cable 15 is reeled and held.This drum 50 rotatably is arranged on each framework 2, is formed with the groove 51 of coiling cable 15 on its outer peripheral face.By such structure, when holding and expanding type speculum, cable 15 is wound up on the drum 50, thereby can prevents that cable 15 from tangling each other.In addition, when expansion-type reflection mirror was unfolded, along with the stretching, extension of each framework 2, each cable 15 was drawn out from each drum 50.
Figure 10 shows the decomposition diagram of the feature structure of the cable network 51 in the expansion-type reflection mirror of the present invention.Among the figure, cable network 51 can be broken down into surperficial cable 61, metal grill 62, connect cable 63 and back side cable 64.
Be installed in the back side of inner surface cable 61a as the metal grill of reflection of electromagnetic wave film.Metal grill as the reflection of electromagnetic wave film can certainly be installed in the back side of whole surperficial cable 61.
The back side cable 64 that is made of the cable network is configured in the back side of metal grill 62.The inboard back side cable 64a of this back side cable 64 is connected on the cable 64c of the back side, end by periphery back side cable 64b.The tie point on a plurality of leg-of-mutton each summit of surface cable 61 connects by each self-corresponding cable 63 that is connected with cable 64.Here, though the connection cable 63 of the surperficial cable 61 that stretches all is connected on the back side cable 64 at opposition side, also can adopt directly the stretch structure of surperficial cable 61 of suitable point from the expanded truss.
In this structure example, owing in inner surface cable 61a, used the high cable of rigidity, thereby the caused length variations of tension variation is very little, thus will form predetermined shape if be applied with tension force.Therefore, even depart from from the precalculated position position of stand-off 52, as long as expanded truss 53 supports, so that apply tension force from outer surface cable 61b and the surperficial to the inside cable 61a of end surface cable 61c, the metal grill 62 that is installed on the inner surface cable 61a just forms predetermined shape.
In addition, in this structure example, rigidity is low because outer surface cable 61b and end surface cable 61c have used, the cable of the caused length variations of tension variation big (softness), so when being supported, be applied to tension variation on the inner surface cable 61a less than in the past surperficial cable when displacement has taken place in the stand-off position by stand-off 52.Owing to launch the factors such as thermal deformation on reproducibility or the track, it is unusual difficulty that the position of the stand-off under the deployed condition 52 is kept constant, but owing to can suppress the minute surface deformation corresponding, so can form than the higher minute surface of precision in the past with the displacement of Support Position by this structure example.
In addition, in connecting cable 63 and back side cable 64, also the same with outer surface cable 61b and end surface cable 61c, can use with inner surface cable 61a and compare mutually that rigidity is low, the cable of the caused length variations of tension variation big (softness), the i.e. little cable of the caused tension variation of length variations.
In addition, also can make whole surperficial cable 61 have identical hardness, and in connecting cable 62 and back side cable 64, use with surperficial cable 61 and compare mutually that rigidity is low, the caused length variations of the tension variation cable of (softness), the i.e. little cable of the caused tension variation of length variations greatly.
Yet, relation between following two kinds of structures is separate, wherein said a kind of structure is meant the structure of flexing of utilizing cable 15 to prevent to apply to cable network 51 expanded truss 53 of tension force shown in Figure 7, another kind of structure is meant and shown in Figure 10 when cable 61a applies tension force and form predetermined mirror shape, is absorbing the displacement of stand-off position to stablize the structure of mirror shape with soft outer surface cable 61b to firm inboard table.Therefore, these two key elements can be applied to respectively individually in the past the expansion-type reflection mirror.In addition, also these two factor combinations can be applied in the past the expansion-type reflection mirror.
Figure 11 shows the perspective view of the structure example (2) of expansion-type reflection mirror of the present invention.Among the figure, this structure example is to have disposed the structure of expanded truss 73 between surperficial cable 71 that forms the cable network and back side cable 72.Surface cable 71 connects by being connected cable with back side cable 72, and under the deployed condition of expanded truss 73, applies tension force and stretch surperficial cable 71 and back side cable 72.
Under the situation of structure example (1), because cable network (surperficial cable, metal grill, connection cable, back side cable) be is configured in the top of expanded truss, so owing to apply reaction force that tension force produces acts on expanded truss by stand-off top to surperficial cable, therefore, owing to surperficial cable extending transversely produce desire to make the bending moment force that is bent upwards to work from the compression stress of lateral center position with among Fig. 1 with respect to the center.On the other hand, under the situation of the structure example (2) of Figure 11, owing under deployed condition, apply tension force with back side cable 72 to surperficial cable 71, so with respect to expanded truss 73, the moment that reaction force produced that is applied by surperficial cable 71 becomes with respect to the direction above the center is in figure under deployed condition.And the reaction force that is caused by back side cable 72 is opposite with it, becomes the direction with respect to below in figure, center, thus these two kinds of power cancel out each other, therefore the power that produces on expanded truss 73 is mainly from the outside towards the compression stress at center.In this case, the structure of the flexing that cable 15 prevents expanded truss 53 of utilizing shown in Figure 7 is very effective.
In addition, the surperficial cable 71 of structure example (2) also can be made of inner surface cable 61a, outer surface cable 61b and end surface cable 61c as shown in Figure 10.Outer surface cable 61b and end surface cable 61c have used the cable of low, the caused length variations of tension variation of specific rigidity big (softness) mutually with inner surface cable 61a, have promptly used the little cable of the caused tension variation of length variations.In addition, back side cable 72 and expanded truss 73 also can use the cable of low, the caused length variations of tension variation of specific rigidity big (softness) mutually with inner surface cable 61a, promptly can use the little cable of the caused tension variation of length variations.
Below, the occupation mode of the expansion-type reflection mirror that constitutes is as mentioned above described, and action effect of the present invention is described.
When the deployable antenna of expansion-type reflection mirror of the present invention has been used in emission, as shown in Figure 6, with expanded truss 53 folding in the very little radome fairing that is contained in rocket.Be launched at rocket, satellite launches in order to make expanded truss 53 after separating and arrive predetermined track from rocket, drives metal wires 9 with motor 12, make all slide hinges 7 along the axial line of third connecting rod 4c to the 4th connecting rod 4d one side shifting.
Thus, as shown in Figure 5, each framework 2 slowly stretches along its direction of axis line, thus the stand-off 52 on extension framework 2 tops radially.Then, as shown in Figure 7, in case each framework 2 full extension, owing to apply next tension force through expanded truss 53, cable network 51 will expand into parabolic shape.At this moment, have compression stress to the direction of axis line effect in the top ends of each framework 2, the size of this compression stress is roughly the same with the tension force that is applied on the cable network 51.Therefore, when launching cable network 51, each framework 2 is owing to this compression stress produces flexing.
But as mentioned above, expansion-type reflection mirror of the present invention is connected by the pairing part of node and the pairing part of antinode of the buckling mode that cable 15 will produce on adjacent framework 2.Therefore, the displacement of the antinode of buckling mode institute counterpart is limited by the cable 15 that is linked to node institute counterpart, thereby the flexing itself that produces on each framework 2 suppressed, thereby the flexing that can prevent framework 2 is damaged.
In order to prove above-mentioned effect, the inventor has prepared three kinds of expanded truss I～III, and has carried out the flexing experiment.The experiment of this flexing is that the cable network is hung on expanded truss I～III, and checks the buckling load of the framework that constitutes expanded truss I～III by apply tension force to this cable network.In addition, the structure of expanded truss I～III is as follows.
Expanded truss I is identical with expanded truss 53 structures of expansion-type reflection mirror of the present invention, and the external diameter of first to the 5th connecting rod 4a～4e is about 20 (mm), and the thickness of first to the 5th connecting rod 2a～2e is about 0.5 (mm), and the total weight of expanded truss is about 27.1 (kg).
Expanded truss II has the structure of having removed cable 15 in the expanded truss 53 of expansion-type reflection mirror of the present invention, the external diameter of first to the 5th connecting rod 4a～4e is about 20 (mm), the thickness of first to the 5th connecting rod 4a～4e is about 0.5 (mm), and the total weight of expanded truss is about 27.1 (kg).
Expanded truss III has the structure of having removed cable 15 in the expanded truss 53 of expansion-type reflection mirror of the present invention, the external diameter of first to the 5th connecting rod 4a～4e is about 25 (mm), the thickness of first to the 5th connecting rod 4a～4e is about 0.5 (mm), and the total weight of expanded truss is about 38.5 (kg).That is, expanded truss III is than thick about 5 (mm) of external diameter of first to the 5th connecting rod 4a～4e that constitutes expanded truss II.
Figure 12 is the curve chart that experimental result is shown.Among the figure, the transverse axis of curve chart represents to be applied to the value of the tension force on the cable network, and the longitudinal axis represents to act on the value of the compression stress on the framework.Expanded truss II buckling load is approximately 3 (kgf) as can be known, and the buckling load of the expanded truss I among the present invention is about 11 (kgf).Can learn that promptly by link the part and the part that becomes antinode of the node that becomes the buckling mode that produces on the framework with cable 15, buckling load has increased about 8 (kgf).
On the other hand, the buckling load of expanded truss III is about 12 (kgf), greater than the buckling load of expanded truss I.But, expanded truss III since overstriking the external diameter of each connecting rod, so total weight has had more about 11.4 (kg).
Can confirm by this experimental result: by as expansion-type reflection mirror of the present invention, linking pairing part of antinode and the pairing part of node that acts on the buckling mode on the adjacent frame with cable 15, the buckling load of framework 2 can be greatly increased, and the weight of expanded truss 53 need not be increased.
Industrial applicibility
Expansion-type reflection mirror of the present invention has expanded truss and consists of by soft outer surface cable Xiang The inner surface cable of minute surface part applies the structure of Zhang Li, Yin this, even the Zhi of expanded truss support Wei Yi Wei takes place in Zhi, and also can reduce the distortion sensitivity of minute surface part, thereby can become mirror surface accuracy by Xing Than the high minute surface of Yi Wang.
In addition, You Yu applies the expanded truss of Zhang Li for the fixed mirror surface accuracy of Yu Xiang the cable network The precision prescribed of desired Zhi support Wei Zhi can reduce Yu Yi Wang Xiang ratio, opens so can relax for Zhan The permissible range of the distortion of truss constitute parts. You this, can reduce the parts rigidity, and can enough sizes Xiao or thinner parts consist of, thereby can consist of lighter expansion-type reflection mirror.
In addition,, can reduce Xiang cable Yu dispose expanded truss between Zhi the cable of the back side by Zai surface cable Network is applied to the bending moment force on the expanded truss when applying Zhang power, this can reduce load on the parts You, Thereby can use lighter parts, and can design structure in light weight.
The antinode institute of the buckling mode that produces on the extensible member by the employing expanded truss in addition, is corresponding The Yi Wei You Yu of part is Yu the binding of node institute counterpart and confined structure, but Yi pars contractilis processed The flexing that produces on the part itself. Yin this, can prevent from using the flexing of the expanded truss of lightweight component to decrease Bad.
Claims (10)
1. expansion-type reflection mirror comprises:
Folding cable network comprises: surperficial cable, and it is a tie point with a plurality of leg-of-mutton each summit; Metal grill is installed on the described surperficial cable with as the reflection of electromagnetic wave film; Back side cable is connected on the described surperficial cable by a plurality of connection cables, this folding cable network under deployed condition, form with triangle be a unit polyhedral structure and
Expanded truss applies tension force to described cable network, thereby makes it become deployed condition,
Described expansion-type reflection mirror is characterised in that described expanded truss comprises:
A plurality of extensible members are attached at respectively on a plurality of periphery fixing points, and can stretch on its direction of axis line, and wherein said a plurality of periphery fixing points are to be provided at predetermined intervals for its circumferencial direction on the outer peripheral portion of described surperficial cable;
Extending apparatus stretches described a plurality of extensible member, and with the peripheral direction expansion of described a plurality of periphery fixing points to described surperficial cable, thereby apply tension force so that its expansion to described surperficial cable;
With
Hookup mechanism is set up between described a plurality of extensible member, links the pairing part of antinode and the pairing part of node of buckling mode, and described buckling mode is when producing on described extensible member when described surperficial cable applies tension force.
2. expansion-type reflection mirror comprises:
Folding cable network comprises: surperficial cable, and it is a tie point with a plurality of leg-of-mutton each summit; Metal grill is installed on the described surperficial cable with as the reflection of electromagnetic wave film; Back side cable is connected on the described surperficial cable by a plurality of connection cables, this folding cable network under deployed condition, form with triangle be a unit polyhedral structure and
Expanded truss applies tension force to described cable network, thereby makes it become deployed condition,
Described expansion-type reflection mirror is characterised in that,
Described surperficial cable is made of inner surface cable and the outer surface cable that is combined on its periphery,
Described inner surface cable has used rigidity height, cable that the caused length variations of tension variation is little, and described outer surface cable has used with described inner surface cable and compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
3. expansion-type reflection mirror as claimed in claim 1 is characterized in that,
Described surperficial cable is made of inner surface cable and the outer surface cable that is combined on its periphery,
Described inner surface cable has used rigidity height, cable that the caused length variations of tension variation is little, and described outer surface cable has used with described inner surface cable and compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
4. expansion-type reflection mirror as claimed in claim 1 is characterized in that, described hookup mechanism is a cable.
5. expansion-type reflection mirror as claimed in claim 4 is characterized in that, comprises the storing apparatus that holds described cable.
6. as each described expansion-type reflection mirror in the claim 1 to 3, it is characterized in that described expanded truss is set between described surperficial cable and the described back side cable.
7. expansion-type reflection mirror as claimed in claim 1 is characterized in that, as described connection cable and described back side cable, has used with described surperficial cable and has compared the cable that rigidity is low, the caused tension variation of length variations is little mutually.
8. expansion-type reflection mirror as claimed in claim 1 is characterized in that, described surperficial cable is constituted as and is approximate parabolic upon deployment.
9. as claim 2 or 3 described expansion-type reflection mirrors, it is characterized in that,, used with described inboard cable and compared the cable that rigidity is low, the caused tension variation of length variations is little mutually as described connection cable and described back side cable.
10. as claim 2 or 3 described expansion-type reflection mirrors, it is characterized in that described inner surface cable is constituted as and is approximate parabolic upon deployment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP318847/2003 | 2003-09-10 | ||
| JP2003318847A JP2006080577A (en) | 2003-09-10 | 2003-09-10 | Expansion antenna |
| JP318862/2003 | 2003-09-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1748342A true CN1748342A (en) | 2006-03-15 |
| CN100541911C CN100541911C (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800036402A Expired - Fee Related CN100541911C (en) | 2003-09-10 | 2004-09-09 | Expansion-type reflection mirror |
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| Country | Link |
|---|---|
| JP (1) | JP2006080577A (en) |
| CN (1) | CN100541911C (en) |
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| CN102040009A (en) * | 2010-12-03 | 2011-05-04 | 西安电子科技大学 | Deployable reflecting surface device under traction drive of rope |
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Also Published As
| Publication number | Publication date |
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| CN100541911C (en) | 2009-09-16 |
| JP2006080577A (en) | 2006-03-23 |
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