CN109149119B - Cable net parabolic cylinder expandable antenna device based on double-shear truss mechanism - Google Patents
Cable net parabolic cylinder expandable antenna device based on double-shear truss mechanism Download PDFInfo
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- CN109149119B CN109149119B CN201810854536.8A CN201810854536A CN109149119B CN 109149119 B CN109149119 B CN 109149119B CN 201810854536 A CN201810854536 A CN 201810854536A CN 109149119 B CN109149119 B CN 109149119B
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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
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
- H01Q15/161—Collapsible reflectors
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
Abstract
The invention belongs to the technical field of antennas and discloses a cable net parabolic cylinder expandable antenna device based on a double-shear truss mechanism, wherein a reflecting surface of a metal wire net is woven into a net by adopting soft gold-plated molybdenum wires or tungsten wires; the supporting cable net comprises transverse flexible cables, longitudinal flexible cables and vertical adjusting cables, each longitudinal flexible cable is parabolic and is woven with the transverse flexible cables to form a front parabolic cylinder-shaped net surface and a rear parabolic cylinder-shaped net surface, and the vertical adjusting cables are connected with the front net surface and the rear net surface; a parabolic cylindrical support cable net formed by weaving flexible cables; the wire mesh is fixed on the cable net to form a parabolic cylindrical surface reflecting surface, and the surface precision of the reflecting surface of the wire mesh is adjusted by adjusting the stress of a flexible cable in the supporting cable net; the expandable truss is adopted to suspend the supporting cable net to realize the expansion of the antenna; the expandable truss mechanism is integrally square and is formed by connecting a plurality of expandable units A in series. The antenna structure does not need to add a complex driving mechanism and an additional synchronizing mechanism, has a simple and reliable structure, and reduces the complexity of antenna design.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a cable net parabolic cylinder deployable antenna device based on a double-shear truss mechanism.
Background
Currently, the current state of the art commonly used in the industry is such that: with the rapid development of aerospace science and technology, the satellite-borne antenna is one of key devices of a satellite system, and plays an important role in the fields of space tasks such as satellite communication, positioning and navigation, deep space exploration and the like. In order to meet the requirements of high frequency domain, high gain, high power and the like, the satellite-borne antenna gradually tends to develop in the direction of large caliber. However, since the conventional transmission device has a certain limitation on the transmission of the antenna having a large aperture due to a storage space, a load, and the like, the antenna having a large aperture must be made expandable. The parabolic cylinder antenna has the characteristics of easiness in automatic beam scanning, high gain, strong directivity and the like, and plays a key role in space tasks needing to adopt the strong-directivity satellite-borne antenna, such as remote communication, electronic reconnaissance, rainfall radar and the like. Some countries in the world such as the united states, germany, japan, etc. have made important research results in the technologies of parabolic cylinder antennas, and the most representative united states has realized the detection of the distribution of rainfall on the earth by a rainfall test radar carrying cylindrical antennas. The traditional parabolic cylinder antenna is formed by supporting an integrated rigid reflecting surface by a rigid member, although the profile precision is high, the antenna is heavy in mass and large in size due to the integrated pure rigid configuration, so that the load space and the bearing capacity of a carrying tool cannot meet the transportation requirements, and therefore the antenna cannot be directly used as a satellite-borne antenna; for the traditional parabolic cylinder antenna, the weight is heavy and the size is huge due to the integrated rigid configuration, and the payload capacity of a carrier can not meet the transportation requirement, so that the traditional parabolic cylinder antenna can not be directly used as a satellite-borne antenna.
For the deployable solid surface antenna, the unit volume is large, resulting in low storage rate; the inflatable unfolding antenna has poor profile precision and stability due to the flowability of gas. Currently, deployable parabolic antennas are primarily of the type that can be deployed on solid surfaces and inflated. The deployable solid surface antenna realizes folding and unfolding through relative rotation of the units, and each unit is formed by a rigid back frame supporting solid reflecting surface, so that the antenna storage rate is low due to large unit volume, and the requirement for large-scale satellite-borne antennas cannot be met. The inflatable parabolic cylinder realizes the drive expansion through the form of inflation, and the volume is obviously reduced after the storage, but the antenna shape and surface precision and the stability are poor due to the strong liquidity of the gas.
In summary, the problems of the prior art are as follows:
(1) the traditional parabolic cylinder antenna is formed by a rigid body reflecting surface supported and integrated by a rigid member, the whole antenna is large in size and heavy in weight, and the carrying capacity of a carrying tool cannot meet the reflecting requirement and cannot be directly used as a satellite-borne antenna.
(2) The existing deployable parabolic cylinder antenna is a deployable solid surface antenna or is deployed by inflation, and the deployable solid surface antenna has low storage rate and is difficult to meet the large-scale requirement of the satellite-borne antenna; the shape accuracy and stability of the inflatable unfolding parabolic cylinder antenna are poor.
The difficulty and significance for solving the technical problems are as follows: antenna design needs to meet multiple requirements under the premise that vehicle loads are limited. The cable net structure has multiple advantages, the difficulties can be effectively solved, and the reliable folding and unfolding mechanism for supporting the cable net structure of the parabolic cylinder has important significance in the development process of the parabolic cylinder antenna.
Parabolic cylinder antennas play an important role in the spatial task. On the premise of meeting the limited bearing capacity of a carrier, the design requirements of light weight, foldability, high storage rate, simple and reliable shape precision and stability regulation and control on the antenna structure are met, and the design requirements are one of the difficulties for solving the technical problems. As a flexible stress system, the cable net structure has significant positive influences on the profile precision and the unfolding stability due to stress points and stress levels, is easy to fold, high in storage rate and easy to realize large caliber. Therefore, the design of a truss deployable mechanism with a light and reliable structure for supporting the cable net structure of the parabolic cylinder is one of effective measures for solving the technical difficulties, and has important practical significance in the development process of the parabolic cylinder deployable antenna.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a cable net parabolic cylinder deployable antenna device based on a double-shear truss mechanism.
The invention is realized in such a way that a cable net parabolic cylinder deployable antenna device based on a double-shear truss mechanism comprises a metal wire mesh reflecting surface, a supporting cable net and a deployable truss mechanism;
the reflecting surface of the metal wire mesh is woven into a net by adopting soft gold-plated molybdenum wires or tungsten wires;
the supporting cable net comprises transverse flexible cables, longitudinal flexible cables and vertical adjusting cables, each longitudinal flexible cable is parabolic and is woven with the transverse flexible cables to form a front parabolic cylinder-shaped net surface and a rear parabolic cylinder-shaped net surface, and the vertical adjusting cables are connected with the front net surface and the rear net surface;
a parabolic cylindrical support cable net formed by weaving flexible cables;
the wire mesh is fixed on the cable net to form a parabolic cylindrical surface reflecting surface, and the surface precision of the reflecting surface of the wire mesh is adjusted by adjusting the stress of a flexible cable in the supporting cable net; and the expandable truss is adopted to suspend the supporting cable net so as to realize the expansion of the antenna.
The expandable truss mechanism is integrally square and is formed by connecting a plurality of expandable units A in series.
Further, the deployable unit a is a double-scissor mechanism, including a fixed joint, a sliding joint, a scissor-type hinge, a connecting piece, a vertical bar, and a scissor arm bar;
the fixed joints are fixed at the upper end and the lower end of the vertical rod, the sliding joints are connected with the vertical rod in a sliding manner, four connecting ends of the scissor type hinge are fixedly connected with the scissor arm rod to form a scissor mechanism, one end of the scissor arm is rotatably connected with the fixed joints through connecting pieces, and the other end of the scissor arm is rotatably connected with the sliding joints through connecting pieces;
each vertical rod is connected with two sliding joints in a sliding mode, the sliding joints of the upper scissors mechanism are located on the lower sides of the sliding joints of the lower scissors mechanism, the unit A is unfolded and folded through opening and closing of the upper scissors mechanism and the lower scissors mechanism, and the final unfolded state is limited through contact of the upper sliding joints and the lower sliding joints.
Furthermore, the fixed joint is an integrated component for realizing connection in three directions, a cylindrical boss is processed in the middle for fixedly connecting with the rod piece, and a fixed connecting hole is formed in the boss; the left and right sides are processed with U-shaped mounting grooves, the U-shaped grooves on the two sides are staggered front and back, and the groove arms are provided with rotary connecting shaft holes.
Furthermore, the sliding joint is an integrated component for realizing connection in three directions, and the middle part of the sliding joint is provided with a sliding connection hole for realizing sleeved sliding with the rod piece; the left side and the right side are provided with U-shaped mounting grooves, the U-shaped grooves on the two sides are staggered front and back, and the groove arms are provided with rotary hinged shaft holes.
Further, connecting piece one end is processed into U type groove, and it has the rotation to connect the shaft hole to open on the groove arm, can realize being connected with the rotation of other members, and the other end is processed into the cylinder boss, and it has fixed connection hole to open on the boss, realizes the fixed connection with the member.
Furthermore, the scissors type hinge is composed of two same scissors arms, the middle parts of the scissors arms are provided with rotating connecting holes, and the two scissors arms are relatively hinged together through the rotating connecting holes to realize relative rotation; the two ends of the connecting rod are symmetrically processed with fixed connecting bosses, and fixed connecting holes are processed on the bosses.
Furthermore, the right-angle fixed joint is an integrated component capable of realizing connection in three directions, a cylindrical boss is processed in the middle part and used for being fixedly connected with the rod piece, and a fixed connecting hole is formed in the boss; u-shaped mounting grooves are processed on the right side and the rear side, the U-shaped grooves on the two sides form an included angle of 90 degrees, and a rotary connecting shaft hole is formed in each groove arm;
the right-angle sliding joint is an integrated component for realizing connection in three directions, and the middle part of the right-angle sliding joint is provided with a sliding connection hole for realizing sleeved sliding with the rod piece; u-shaped mounting grooves are processed on the right side and the rear side of the hole, the U-shaped grooves on the two sides form an included angle of 90 degrees, and a rotary connecting shaft hole is formed in each groove arm.
Furthermore, the whole deployable truss mechanism is square, and the connecting members at the corners mainly comprise right-angle fixed joints, right-angle sliding joints and vertical rods; the right angle fixed joint fixed connection is in montant upper end and lower extreme, and right angle sliding joint and montant sliding connection, but adjacent expansion unit A of mechanism corner connects into 90 through right angle fixed joint, right angle sliding joint.
Furthermore, two driving springs are sleeved on the vertical rod at the corner of the expandable truss mechanism, one end of each spring is fixed on the right-angle fixed joint at the upper end of the vertical rod, and the other end of each spring is fixed on the right-angle sliding joint of the lower side scissor mechanism; one end of the other spring is fixed on a right-angle fixed joint at the lower end of the vertical rod, and the other end of the other spring is fixed on a right-angle sliding block joint of the upper side scissor mechanism;
when the unfolding units A of the expandable truss mechanism are folded, the scissor mechanism is closed, and the spring is compressed to store elastic potential energy; when the elastic potential energy of the spring is released, the scissors mechanisms are unfolded, each unfolding unit A is unfolded, and the unfolding units are unfolded to reach a final state when sliding joints of the upper side scissors mechanisms and the lower side scissors mechanisms are contacted.
The invention also aims to provide a satellite-borne antenna provided with the cable net parabolic cylinder expandable antenna device based on the double-shear truss mechanism.
In summary, the advantages and positive effects of the invention are: the invention adopts the scissors type expandable truss as the action implementation mechanism of the antenna, and the mechanism can be folded and expanded, so that the antenna is in a folded state in the transportation process, and the storage space is greatly saved. The invention adopts the cable net to support the wire mesh reflecting surface to form the parabolic cylinder, and can lead each cable section of the cable net to reach an ideal position by adjusting the vertical flexible cable tension of the supporting cable net, thereby leading the wire mesh reflecting surface fixed on the cable net to achieve higher profile precision.
The invention adopts the spring to drive, realizes the synchronous unfolding and folding of the antenna through the linkage characteristic of the scissor mechanism, does not need to add a complex driving mechanism and an additional synchronous mechanism, has simple and reliable structure and reduces the complexity of the antenna design. The mesh-shaped deployable antenna adopts the wire mesh as the reflecting surface, so that the overall weight of the antenna is effectively reduced, and certain requirements on shape surface precision and stability can be met.
Drawings
Fig. 1 is a schematic structural diagram of a cable-net parabolic cylinder deployable antenna device based on a double-shear truss mechanism according to an embodiment of the present invention;
FIG. 2 is a drawing together structure of a dual shear truss mechanism provided in accordance with an embodiment of the present invention;
fig. 3 is a structural diagram of a cable-net parabolic cylinder deployable antenna apparatus based on a double-shear truss mechanism according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the process of unfolding the deployable cell A according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the fixed joint assembly of the deployable unit A according to an embodiment of the present invention;
fig. 6 is a view showing the fitting relationship of the sliding joint of the deployable unit a according to the embodiment of the present invention;
FIG. 7 is a block diagram of a fixed joint provided by an embodiment of the present invention;
FIG. 8 is a view of a slide joint construction provided by an embodiment of the present invention;
FIG. 9 is a block diagram of a connector provided by an embodiment of the present invention;
FIG. 10 is a perspective view of a scissors hinge provided in an embodiment of the present invention;
FIG. 11 is a view of the right angle fixed joint assembly at the corner of the double shear truss mechanism provided in accordance with an embodiment of the present invention;
FIG. 12 is a view of the right angle sliding joint assembly at the corner of the double shear truss mechanism provided in accordance with an embodiment of the present invention;
FIG. 13 is a block diagram of a right angle fitting provided by an embodiment of the present invention;
FIG. 14 is a block diagram of a right angle slip joint provided by an embodiment of the present invention;
in the figure: 1. a wire mesh reflective surface; 2. a support cable net; 2-1, longitudinal flexible cables; 2-2, transversely flexible cables; 2-3, a vertical adjusting cable; 3. a double shear truss mechanism; 4. a vertical rod; 5. a scissor arm lever; 6. fixing the joint; 6-1, fixing a boss by a cylinder; 6-2, a U-shaped mounting groove; 7. a right-angle fixed joint; 7-1, fixing a boss by a cylinder; 7-2, a U-shaped mounting groove; 8. a slip joint; 8-1, sliding connection holes; 8-2, a U-shaped mounting groove; 9. a right angle slip joint; 9-1, sliding connection holes; 9-2, a U-shaped mounting groove; 10. a scissors hinge; 10-1, rotatably connecting the shaft holes; 10-2, fixedly connecting a boss; 11. a connecting member; 12. a spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems that the existing antenna has larger integral volume and heavier mass and can not be directly used as a satellite-borne antenna; the shape precision and the stability are poor. The invention has light and reliable design structure, and the parabolic cylinder deployable antenna meeting the requirement of certain surface precision has important practical significance. The invention provides a cable net parabolic cylinder expandable antenna device based on a scissor truss mechanism on the basis of a net expandable antenna.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1 to fig. 3, the cable-mesh parabolic-cylindrical expandable antenna apparatus based on a double-shear truss mechanism according to an embodiment of the present invention forms a parabolic-cylindrical support cable mesh 2 by weaving flexible cables, a wire mesh 1 is fixed on the cable mesh 2 to form a parabolic-cylindrical reflective surface, the shape accuracy of the wire mesh reflective surface 1 can be adjusted by adjusting the stress on the flexible cables in the support cable mesh 2, and the expandable truss 3 is used to suspend the support cable mesh 2 to realize the expansion of the antenna. The antenna integrally comprises a wire mesh reflecting surface 1, a supporting cable net 2 and an expandable truss mechanism 3.
As shown in fig. 3(a), the reflective surface 1 of the wire mesh is woven by soft gold-plated molybdenum wires or tungsten wires to form a mesh, and after the antenna is completely unfolded, the reflective surface 1 of the wire mesh generates a certain tension under the action of the supporting cable net 2, so as to achieve the required profile accuracy.
As shown in fig. 3(b), the supporting cable net 2 mainly comprises transverse flexible cables 2-2, longitudinal flexible cables 2-1 and vertical adjusting cables 2-3, each longitudinal flexible cable 2-1 is parabolic and is woven with the transverse flexible cables 2-2 to form a front parabolic cylinder net surface and a rear parabolic cylinder net surface, and the vertical adjusting cables 2-3 are connected with the front net surface and the rear net surface and can adjust the shapes of the front parabolic cylinder net surface and the rear parabolic cylinder net surface.
As shown in fig. 2 and 3(c), the expandable truss mechanism 3 is square as a whole and is formed by connecting a plurality of expandable units a in series.
As shown in fig. 4-6, the deployable unit a is a double-scissor mechanism, which is composed of two sets of scissor mechanisms at the upper side and the lower side, and mainly includes a fixed joint 6, a sliding joint 8, a scissor-type hinge 10, a vertical rod 4, and a scissor arm 5. Fixed joint 6 is fixed in the upper end and the lower extreme of montant 4, sliding joint 8 and montant 4 sliding connection, four links of scissors formula hinge 10 form scissors mechanism with 5 fixed connection of scissors arm pole, and scissors arm one end is passed through connecting piece 11 and is connected with 6 rotations of fixed joint, and the other end passes through connecting piece 11 and is connected with 8 rotations of sliding joint. Each vertical rod 4 is connected with two sliding joints 8 in a sliding mode, the sliding joints 8 of the upper scissors mechanism are located on the lower side of the sliding joints 8 of the lower scissors mechanism, the unit A is unfolded and folded through opening and closing of the upper scissors mechanism and the lower scissors mechanism, and the final unfolded state is limited through contact of the upper sliding joints 8 and the lower sliding joints 8.
As shown in fig. 7, the fixed joint 6 is an integrated component capable of realizing connection in three directions, a cylindrical boss 6-1 is processed in the middle for fixedly connecting with the rod piece, and a fixed connection hole is formed on the boss; the left side and the right side are provided with U-shaped mounting grooves 6-2, the U-shaped grooves 6-2 on the two sides are staggered front and back, and the groove arms are provided with rotary connecting shaft holes.
As shown in fig. 8, the sliding joint 8 is an integrated member capable of realizing connection in three directions, and a sliding connection hole 8-1 is formed in the middle part to realize sleeved sliding with the rod piece; the left side and the right side are provided with U-shaped mounting grooves 8-2, the U-shaped grooves 8-2 on the two sides are staggered front and back, and the groove arms are provided with rotary hinge shaft holes.
As shown in FIG. 9, one end of the connecting member 11 is processed into a U-shaped groove 11-2, a rotary connecting shaft hole is formed on the arm of the groove to realize rotary connection with other members, the other end of the connecting member is processed into a cylindrical fixed connecting boss 11-1, and a fixing hole is formed on the boss 11-1 to realize fixed connection with a rod member.
As shown in fig. 10, the scissors type hinge is composed of two identical scissors arms 10, the middle part of the scissors arm 10 is a rotation connecting hole 10-1, and the two scissors arms 10-1 are relatively hinged together through the rotation connecting hole to realize relative rotation; the fixed connection bosses 10-2 at the two ends are symmetrical, and the fixed connection holes are processed on the bosses 10-2.
As shown in fig. 3(c), fig. 11, and fig. 12, the expandable truss mechanism 3 is square as a whole, and the connecting members at the corners mainly include right-angle fixed joints 7, right-angle sliding joints 9, and vertical bars 4. The right-angle fixed joint 7 is fixedly connected to the upper end and the lower end of the vertical rod 4, the right-angle sliding joint 9 is in sliding connection with the vertical rod 4, the adjacent deployable units A at the corners of the mechanism are connected into 90 degrees through the right-angle fixed joint 7 and the right-angle sliding joint 9, and then the deployable truss mechanism 3 is integrally square.
As shown in fig. 13, the right-angle fixed joint 7 is an integrated component capable of realizing connection in three directions, a cylindrical boss 7-1 is processed in the middle for fixedly connecting with a rod, and a fixed connection hole is formed on the boss 7-1; u-shaped mounting grooves 7-2 are processed on the right side and the rear side, the U-shaped grooves 7-2 on the two sides form an included angle of 90 degrees, and rotating connecting shaft holes are formed in the groove arms.
As shown in fig. 14, the right-angle sliding joint 9 is an integrated member capable of realizing connection in three directions, and the middle part is provided with a sliding connection hole 9-1 capable of realizing sleeved sliding with a rod piece; u-shaped mounting grooves 9-2 are processed on the right side and the rear side of the hole, U-shaped grooves 9-2 on the two sides form an included angle of 90 degrees, and rotary connecting shaft holes are formed in the groove arms.
Referring to fig. 12, two driving springs 12 are sleeved on the vertical rod 4 at the corner of the expandable truss mechanism 3, one end of each spring 12 is fixed on the right-angle fixed joint 7 at the upper end of the vertical rod 4, and the other end of each spring 12 is fixed on the right-angle sliding joint 9 of the lower side scissor mechanism; one end of another spring 12 is fixed on the right-angle fixed joint 7 at the lower end of the vertical rod 4, and the other end is fixed on the right-angle sliding block joint 9 of the upper side scissors mechanism.
As shown in fig. 2, fig. 3(c), fig. 4, fig. 6 and fig. 12, when the unfolding units a of the expandable truss mechanism 3 are folded, the scissors mechanism is closed, and the spring 12 is compressed to store elastic potential energy; the spring 12 elastic potential energy is released, the scissors mechanism is opened, each unfolding unit A is unfolded, and the unfolding reaches the final state when the upper and lower scissors mechanism sliding joints 8 and the right-angle sliding joint 9 are contacted.
The working principle of the invention is as follows: the scissor mechanism is closed when the cable net parabolic cylinder expandable antenna device based on the double-scissor truss mechanism is in an initial state, all expandable units A are folded together, the periphery of the antenna is bound through ropes to keep the antenna integrally folded, and in the state, springs assembled on vertical rods at corners of square trusses are compressed to store elastic potential energy. After the antenna is launched into the rail, the rope bound on the periphery of the antenna is automatically disconnected, the elastic potential energy of the spring is released, the sliding joint of the scissors mechanism slides along the vertical rod under the action of the elastic potential energy, each unfolding unit A is unfolded, then the unfoldable truss is unfolded, and the cable net and the metal wire net which are suspended on the truss are unfolded accordingly. When the sliding joints of the upper scissors mechanism and the lower scissors mechanism are contacted, the antenna is unfolded to a final state, the elastic potential energy of the spring is not completely released, and the antenna is kept in a completely unfolded state under the limiting action of the mutual contact of the sliding joints of the upper scissors mechanism and the lower scissors mechanism and the pushing force of the residual elastic potential energy of the spring.
Referring to fig. 1-10, in an initial state of a cable net parabolic cylinder expandable antenna device based on a double-shear truss mechanism, a scissor mechanism is closed, expandable units a are folded together, and the periphery of the antenna is kept in an overall folded state (binding ropes are not shown) shown in fig. 2 through rope binding, and in the state, springs 12 mounted on vertical rods 4 at corners of square trusses 3 are compressed to store elastic potential energy. After the antenna is launched into the track, the rope bound on the periphery of the antenna is automatically disconnected, the elastic potential energy of the spring 12 is released, the sliding joints 8 and 9 of the scissor mechanism slide along the vertical rod 4 under the action of the elastic potential energy, each unfolding unit A is unfolded as shown in fig. 4, the extensible truss 3 is unfolded, and the cable net 2 and the wire mesh 1 suspended on the truss are unfolded accordingly. The antenna is maintained in the fully deployed state shown in fig. 1 by the restraining action of the upper and lower scissor mechanism slip joints 8, 9 contacting each other and the urging force of the remaining elastic potential energy of the spring 12, as the deployment reaches a final state when the upper and lower scissor mechanism slip joints 8, 9 are contacting, at which point the spring 12 elastic potential energy is not fully released.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The cable net parabolic cylinder expandable antenna device based on the double-shear truss mechanism is characterized by comprising a metal wire mesh reflecting surface, a supporting cable net and an expandable truss mechanism;
the reflecting surface of the metal wire mesh is woven into a net by adopting soft gold-plated molybdenum wires or tungsten wires;
the supporting cable net comprises transverse flexible cables, longitudinal flexible cables and vertical adjusting cables, each longitudinal flexible cable is parabolic and is woven with the transverse flexible cables to form a front parabolic cylinder-shaped net surface and a rear parabolic cylinder-shaped net surface, and the vertical adjusting cables are connected with the front net surface and the rear net surface;
a parabolic cylindrical support cable net formed by weaving flexible cables;
the wire mesh is fixed on the cable net to form a parabolic cylindrical surface reflecting surface, and the surface precision of the reflecting surface of the wire mesh is adjusted by adjusting the stress of a flexible cable in the supporting cable net; the expandable truss is adopted to suspend the supporting cable net to realize the expansion of the antenna;
the expandable truss mechanism is integrally square and is formed by connecting a plurality of expandable units A in series;
the deployable unit A is a double-scissor mechanism and comprises a fixed joint, a sliding joint, a scissor type hinge, a connecting piece, a vertical rod and a scissor arm rod;
the fixed joints are fixed at the upper end and the lower end of the vertical rod, the sliding joints are connected with the vertical rod in a sliding manner, four connecting ends of the scissor type hinge are fixedly connected with the scissor arm rod to form a scissor mechanism, one end of the scissor arm is rotatably connected with the fixed joints through connecting pieces, and the other end of the scissor arm is rotatably connected with the sliding joints through connecting pieces;
each vertical rod is connected with two sliding joints in a sliding mode, the sliding joints of the upper scissors mechanism are located on the lower sides of the sliding joints of the lower scissors mechanism, the unit A is unfolded and folded through opening and closing of the upper scissors mechanism and the lower scissors mechanism, and the final unfolded state is limited through contact of the upper sliding joints and the lower sliding joints.
2. The cable net parabolic cylinder deployable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein the fixed joint is an integrated component for realizing connection in three directions, a cylindrical boss is processed in the middle for fixedly connecting with the rod member, and a fixed connection hole is opened on the boss; the left and right sides are processed with U-shaped mounting grooves, the U-shaped grooves on the two sides are staggered front and back, and the groove arms are provided with rotary connecting shaft holes.
3. The cable net parabolic cylinder deployable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein the sliding joint is an integrated component for realizing connection in three directions, and a sliding connection hole is formed in the middle part for realizing sleeved sliding with a rod piece; the left side and the right side are provided with U-shaped mounting grooves, the U-shaped grooves on the two sides are staggered front and back, and the groove arms are provided with rotary hinged shaft holes.
4. The cable net parabolic cylinder deployable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein one end of the connecting member is formed into a U-shaped slot, the slot arm is formed with a rotary connecting shaft hole for realizing rotary connection with other members, and the other end is formed into a cylindrical boss, the boss is formed with a fixed connecting hole for realizing fixed connection with a rod member.
5. The cable-net parabolic cylinder deployable antenna apparatus based on a dual-shear truss mechanism as claimed in claim 1, wherein the scissor hinge is composed of two identical scissor arms, the middle part of the scissor arms is a rotation connection hole, and the two scissor arms are hinged together relatively through the rotation connection hole to realize relative rotation; the two ends of the connecting rod are symmetrically processed with fixed connecting bosses, and fixed connecting holes are processed on the bosses.
6. The cable net parabolic cylinder deployable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein the fixed joint is an integrated component capable of realizing connection in three directions, a cylindrical boss is processed in the middle for fixed connection with the rod member, and a fixed connection hole is opened on the boss; u-shaped mounting grooves are processed on the right side and the rear side, the U-shaped grooves on the two sides form an included angle of 90 degrees, and a rotary connecting shaft hole is formed in each groove arm;
the sliding joint is an integrated component for realizing connection in three directions, and the middle part of the sliding joint is provided with a sliding connection hole for realizing sleeved sliding with the rod piece; u-shaped mounting grooves are processed on the right side and the rear side of the hole, the U-shaped grooves on the two sides form an included angle of 90 degrees, and a rotary connecting shaft hole is formed in each groove arm.
7. The cable-net parabolic expandable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein the expandable truss mechanism is a square as a whole, and the connecting members at the corners mainly comprise fixed joints, sliding joints and vertical bars; fixed joint fixed connection is in montant upper end and lower extreme, and sliding joint and montant sliding connection, but adjacent expansion unit A of mechanism corner connects into 90 through fixed joint, sliding joint.
8. The cable-net parabolic expandable antenna apparatus based on a double-shear truss mechanism as claimed in claim 1, wherein two driving springs are sleeved on the vertical rods at the corners of the expandable truss mechanism, one end of each spring is fixed on the fixed joint at the upper end of the vertical rod, and the other end is fixed on the sliding joint of the lower-side shear mechanism; one end of the other spring is fixed on the fixed joint at the lower end of the vertical rod, and the other end of the other spring is fixed on the sliding block joint of the upper side scissor mechanism;
when the unfolding units A of the expandable truss mechanism are folded, the scissor mechanism is closed, and the spring is compressed to store elastic potential energy; when the elastic potential energy of the spring is released, the scissors mechanisms are unfolded, each unfolding unit A is unfolded, and the unfolding units are unfolded to reach a final state when sliding joints of the upper side scissors mechanisms and the lower side scissors mechanisms are contacted.
9. A satellite-borne antenna provided with the cable-net parabolic cylinder deployable antenna device based on the double-shear truss mechanism as claimed in any one of claims 1 to 8.
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| CN110120575B (en) * | 2019-05-11 | 2020-10-16 | 西安电子科技大学 | Expandable parabolic cylinder antenna based on hinged rib structure |
| CN110767977B (en) * | 2019-10-12 | 2021-07-13 | 西安电子科技大学 | Vertical cable adjusting device for cable net antenna |
| CN111430876B (en) * | 2020-04-16 | 2022-05-03 | 安徽大学 | Multi-superelastic hinge parabolic cylinder antenna deployable mechanism |
| CN112713379B (en) * | 2020-12-08 | 2021-11-12 | 西安电子科技大学 | Deployable antenna adopting Y-shaped rib cable net parabolic cylinder, control method and application |
| CN113047449A (en) * | 2021-02-25 | 2021-06-29 | 上海卫星工程研究所 | Parabolic antenna cable net node connecting device |
| CN113241514B (en) * | 2021-05-28 | 2022-05-27 | 上海航天计算机技术研究所 | Conical double-helix deployable antenna |
| CN113488772B (en) * | 2021-07-05 | 2022-09-30 | 西安电子科技大学 | Novel foldable netted annular deployable antenna |
| CN117145116B (en) * | 2023-10-31 | 2024-02-20 | 中国建筑设计研究院有限公司 | Vertical self-balancing hyperboloid cable net curtain wall supporting system |
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