JPH02135902A - Expanding truss antenna - Google Patents

Abstract

PURPOSE:To obtain high rigidity by providing a stretched belt shape wire and a belt shape wire which couples a stopper on an arbor with the center part of the wire and is stretched between antennas mutually at the time of spreading a spread transformer antenna. CONSTITUTION:When a slide hinge 11 approaches the stopper 16, the belt shape wires 21 between connectors 3a on an upper plane side, between the connectors 3a and 3c on a lower plane side, and between the connector 3a on the free terminal of the upper plane side and the connector 3c on the free terminal of the lower plane side are stretched, and the belt shape wires 21 are arranged almost in a straight line at this side before the main slide hinge 11 is abutted with the stopper 15. Until then, the belt shape wire 21 is deformed elastically in U shape in almost center of a quadrangle generated by the connectors 3. And the belt shape wire 21 continues to stretch until the main slide hinge 11 is abutted with the stopper 16. Since the belt shape wire 21 stretched in such way presses the connector 3 to a rib 12 side, no pin connection part is required, and the expanding truss antenna with high rigidity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lightweight deployable truss antenna that is highly storable.

[Conventional technology]

In recent years, the performance and reliability of space shuttles, Ariane rockets, etc. have improved, creating economic benefits for space use. In particular, large deployable antennas are indispensable for communication in mobile bodies such as ships and vehicles, and deployable truss structures for constructing these antennas have been actively developed. This is because it is believed that the deployable structure method is the most economical way to construct huge antennas in space.

Figure 5 shows the above-mentioned deployable truss antenna.
Engineering EKE TRANSACT Engineering 0N8AND PROP
It was shown in AGATIONS JAP-17, No. 4 (1969). In a diagram showing a conventional deployment truss structure.

In the figure, (1) constitutes a triangular lattice on the upper and lower surfaces of this truss structure, and the bending member that can be bent at the center (
2) is a diagonal member that supports the triangular lattice on the upper and lower surfaces, and (3) is a connector that connects the bent member fl1 and f+ member (2) with a pin.

FIG. 6 is an enlarged view of part A surrounded by the broken line circle in FIG. This is used to connect the connector (3) to the bin.

Figure 7 is an enlarged view of the part B surrounded by the broken line circle in the fifth prisoner, and the bend in the center of the part (1) shows the details of the part. A rotatable hinge lever (6) consisting of two plates connected at the center with a pin is attached to one base of the hinge lever (5), and the hinge lever (6) is attached to the base of one of the hinge levers (5), and the bending member (11) is rotated in the direction of HM. Lever (5
), (7) is a connecting pin that connects the bending member +11 and the hinge lever (51);
(7a) and <7b)? -1 A pin that connects the hinge lever (5) and the bent member (11), (70 is a connecting pin that connects the nine bent members (11) at the center.

The above structure has a structure in which a plurality of tetrahedrons each composed of 9 members (11, 3 diagonal members (2), and 3 connectors (3) are joined together by three bends) It is also called a body truss antenna. Fig. 8 is a diagram showing the deployable truss antenna in the middle of deployment.

Also, no special treatment was taken for the wires that were being deployed.

Next, the operation will be explained. Initially, the antenna was restrained by a holding cable (not shown) in its retracted form, but it became movable by cutting the holding cable with a detonator or the like in response to a command from the ground.

Deployment begins due to the spring force of the spiral spring (6).

The unfolding is done by rotating the hinge lever (5) with the spring force of the spiral spring (6), which bends the nine members (11) into the connecting bin (
7C) Stretch while rotating. As the bent member (11) extends, the connectors (3) on the upper and lower surfaces spread radially and the opening progresses. When the bent member (1) extends linearly, the hinge lever (5) The rotational torque generated by the spiral spring force is balanced by the contact surface pressure at the bent surface of the bent member (1).

There are 9 bent members (11 stops moving). This is the unfolded shape, and the structure is a shape connected by 1 of the triangular lattice. The triangular lattice is basically a rigid female structure.

Previously, this type of structure was thought to be very rigid and suitable for deployable antenna structures.

[Problem to be solved by the invention]

In the conventional structure, the connection points of each member are not actually concentrated at one point, so the structure is soft and cannot even maintain its own shape. In other words, the triangular lattice is rigid only when each member is connected at one point as shown in FIG.

In the conventional structure, this triangular lattice has many hinge connection points as shown in FIG. 10, resulting in a weak or unstable link structure. In Figures 9 and 10, (8) is the basic member constituting the triangular lattice, (9) is the bin join that connects the basic member (8), and f31 is the bin joint (9).
This is a connector that connects the Nyofu basic member (8).

As explained above, conventional deployable truss antennas using bendable members have a fundamentally unstable structure, and therefore have the fatal problem of not being able to provide the required rigidity as a deployable antenna.

In addition, when the deployable truss antenna described above transitions from the storage state to the deployment state, the wire 03 that stretches between the connectors on the lower side of the antenna becomes entangled and connected to the shaft +IG because the shaft αalC hangs down substantially parallel when the antenna is stored. There was also the problem that the space between the two wires (31) widened and the tension of the wire caused the mandrel to bend and break.

The present invention was made to solve the above-mentioned problems, and provides a deployable truss antenna that is structurally stable and highly rigid in its deployed shape and is free from bending damage caused by wires during deployment.

[Means to solve the problem]

The deployable truss antenna according to the present invention includes a mandrel to which a connector having a binge joint part is coupled at one end and a stopper at the other end, and a main slide hinge that slides on the mandrel during deployment and finally rests against the stopper. , N (N is 4, 6) lips extending radially, one end of which is coupled to the main slide hinge, a synchronous slide hinge that slides between one end of the mandrel and the raw slide hinge, and one end of which is connected to the synchronous slide hinge. and a coil spring provided between the main slide hinge and the synchronous slide hinge. are arranged so that adjacent ones are in opposite directions, and the lips except for the lip that becomes the free end of the deployable truss antenna are connected to the connectors of the mandrels in opposite directions,
and a plurality of frames formed by connecting connectors on the mandrels facing oppositely to each other with diagonal members, between the connectors on the mandrels with the mandrels facing the same direction, and a lip serving as the free end of the deployable truss antenna. between the other ends, and between the other end of the lip serving as the free end of the deployable truss antenna and the connector,
A wire that is stretched between the deployable truss antenna when the deployable truss antenna is deployed, and a wire that connects the stopper on the mandrel and the central portion of the wire and is stretched between the deployable truss antenna when the deployable truss antenna is deployed, The wire in the rectangle formed by the lower main sliding hinge part of the deployable truss antenna, the peripheral connector on the mandrel, and the connector adjacent to it,
It has a flat, band-like shape to prevent damage to the mandrel during deployment.

[Effect]

In this invention, the wires stretched between the vertices of the N (N is 4, 6) pyramid produce a compressive force on the lip and achieve a force equilibrium state, so the wires are connected by pins. The looseness of the parts disappears, and the N-pyramid, which is the basic module, has a safe structure and high rigidity. Furthermore, since each of the N pyramids unfolds synchronously, the reliability of the deployment is increased, and no external energy is required in addition to the force of a spring to deploy the 5N pyramids.

Further, when stored, the band-like flat wire is elastically deformed and positioned at approximately the center VCU shape of the rectangle formed by the connector, so that the wire does not come close to the mandrel and get caught during deployment.

〔Example〕

No. 1 (2) is a diagram showing a hexagonal pyramidal deployable truss antenna in a deployed configuration showing an embodiment of the present invention; (2) is a diagonal member;
(3a) and (3b) are connectors that have a binge joint, (3) are connectors that are located at the other end of the lip that becomes the free end of the open truss/tenner, and the diagonal member (2) is a connector that has a Connector (3a) and connectors (jb) and (3c) on the negative side
All bins are combined. αG has a conjugate (
3), in which adjacent mandrels are arranged with their axial directions opposite to each other. αυ is a main slide hinge that slides on the shaft 00, and Q2 has one end radially coupled to the main slide hinge α9.

It is a lip that can be deployed in a direction perpendicular to the axial direction of the mandrel, and is attached on the adjacent mandrel CI [l] in the opposite direction to the connector (3a) on the mandrel Qo. It is pin-coupled to the connector (3b). Furthermore, the free end of the deployable truss antenna is connected to a connector (3C). (14+ is a synchronous slide hinge that slides on the shaft between the connector (3) and the main slide hinge αυ, and 14+ is a synchronous slide hinge that slides on the shaft between the connector (3) and the main slide hinge αυ. A pin-connected synchronous beam is shown.

08 is a conductive metal net that becomes the mirror surface of the deployable truss antenna, and supports and secures the shape when deployed and stored. α9 is a net fixing tool for net αg.

t2D is a strip wire.

Figure 2 is an enlarged view of part C in Figure 1, where αG is a stopper that determines the bottom dead center of the main slide hinge αυ during deployment, and α is a coil that provides the driving force to deploy the deployable truss structure of the present invention. , even is a net adjustment nut that adjusts the net α ladder to the height of the mandrel OG, and θ is the angle formed by the mandrel αO and lip α2, which is set to be around 90° when deployed. .

FIG. 3 is a diagram showing the deployable truss antenna of the present invention in the middle of deployment.

Figure 4 shows the reason for enlarging the peripheral part of the belt wire 09 in Figure 3. @ is a net adjustment tool located below each core C1Cl to adjust the net shape, and Qυ is below the deployable truss antenna. It is a band-shaped wire having a flat rectangular shape formed by the connector (3) of the main sliding hinge on the side, the peripheral connector (3a), and the connector (6C) adjacent to it.

The deployment operation of the deployable truss antenna configured as described above will be described below. The deployable truss antenna of the present invention has a connector on the shaft α1 when retracted.

For example, (3a) and the main slide hinge a on the axle αa
B and another connector 2 connected to the other end of the lip (12), for example (3b
) is a collapsed triangle.

The angle θ between the lip (12) and the mandrel (IG) shown in FIG. 2 has become zero, and as shown in the fourth factor, the strip wire Qυ on the lower side of the deployable truss antenna is elastically deformed into a U-shape. Deployment is performed by pushing apart the main slide hinge (111) and the synchronous slide hinge α by the spring force of the coil spring αη shown in FIG. 2.The main slide hinge αB
As the distance between the main slide hinge α0 and the main slide hinge α0 increases, the connector (5a) on the shaft αG and the main slide hinge α0
However, the distance between the connector (5a) and the other connector (5b) is maintained at a constant length by the diagonal member (2), and the distance between the connector (5b) and the other connector (5b) increases. ) and the main slide hinge 11 is also maintained at the length of lip α2, so the triangle consisting of the three vertices is expanded by 9. As the angle θ formed between the lip Q2 and the shaft 013 increases, the other connector (5b) and the further The distance between further connectors 2, for example (3C) also increases.

Along with the spread of the triangle 9, the connector (3) of the main slide hinge 0υ portion on the lower surface side of the deployable truss antenna, the peripheral connector (6a), and the connector (3c) adjacent to the above (6a).
) The rectangle formed by VC is also wide, and the band-shaped w^'-an that is elastically deformed in the center is also wide. It gains tension and spreads from the connector (3) side.

When the slide hinge συ comes close to the stopper θG, the upper surface side connector (3a) and the lower surface side connector (3a
), (3c), and between the connector (3a) on the upper free end and the connector (3C) on the lower free end are stretched, and the main slide hinge I is suspended from the stopper. The strip wire 〇υ becomes almost in a straight line before it hits. Up to this point, the strip wire Q11 has been elastically deformed into a U-shape approximately at the center of the rectangle formed by the connector (3). For this reason, the belt wire c2υ is the mandrel αJ
To prevent damage to the Shinshin αa without getting caught. The strip wire ai+ continues to be stretched until the main slide hinge αll hits the stopper αG. Since the stretched band wire I2υ presses the connector (3) toward the lip α2, there is no bottle joint, and the deployable truss antenna becomes a highly rigid antenna.

〔Effect of the invention〕

As described above, the present invention connects the band wire stretched between the vertices of an N-pyramid, the stopper on the mandrel, and the center portion of the band wire.

By providing a belt-shaped wire that is stretched between the deployable truss antennas when they are deployed, high rigidity can be easily obtained due to the structure without backlash, and the belt-shaped wire can be elastically deformed into a U-shape. This has the effect that it is easy to prevent damage to the mandrel and strip wire due to wire wobbling.

[Brief explanation of the drawing]

FIG. 1 shows a deployment truss showing one embodiment of the present invention. A conceptual diagram of an antenna, FIG. 2 is a diagram showing a member joining part in an embodiment of this invention, FIG. 3 is a diagram showing a shape in the middle of development showing an embodiment of this invention, and FIG. 4 is an embodiment of this invention. The figure which shows the peripheral part of the belt-shaped wire. FIG. 5 is a diagram showing an exploded shape of a conventional example, FIG. 6 is a diagram showing a diagonal member connecting portion in a conventional example, and FIG. 7 is a diagram showing a mechanism of a bent member of a triangular lattice in a conventional example. FIG. 8 is a diagram showing a shape in the middle of development in a conventional example, FIG. 9 is a physical model diagram of a triangular lattice conventionally considered, and FIG. 10 is an actual physical model diagram of a triangular lattice in a conventional example. In the figure, (1) is a folding member, (21 is a diagonal member, (3) is a connector, (41 is a web, (5) is a hinge lever, (6) is a spiral spring, and (7) is a connecting pin. , (81i
j basic member, (9) is binge joint, aα is mandrel, α
υσ main thrust slide hinge z is rib, 03 is wire,
α core is a synchronous slide hinge, Q9 is a synchronous beam, αe is a stopper, GD is a coil spring, brocade is a net, α9 is a net fixing device, the prisoner is a net adjustment nut), and On is a band wire. Note that in the two figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A mandrel to which a connector having a pin joint portion is coupled to one end and a stopper, a main slide hinge that slides on the mandrel, one end of which is radially pin-coupled to the main slide hinge and extends in the axial direction of the mandrel. On the other hand, N (N is 4, 6) ribs that can be expanded in directions perpendicular to each other, a synchronous slide hinge that slides between one end of the mandrel and the main slide hinge, one end of which is radially pin-coupled to the synchronous slide hinge. , and a coil spring provided between the main slide hinge and the synchronous slide hinge, the other end of which is pin-coupled to each of the N ribs, and a coil spring provided between the main slide hinge and the synchronous slide hinge. The ribs, excluding the ribs that are arranged in the same direction as the free end of the deployable truss antenna, are connected by connectors on the mandrels that are oriented in opposite directions, and the connectors on the mandrels that are in opposite directions are connected by diagonal members. between the connectors on the mandrels whose mandrels have the same orientation, between the other ends of the ribs which become the free ends of the deployable truss antenna, and between the other ends of the ribs which become the free ends of the deployable truss antenna. The other end of the rib and the connectors are connected together, and when the deployable truss antenna is deployed, a wire that is stretched between the connectors is connected to the stopper on the mandrel and the center portion of the wire, and the deployable truss antenna is connected. a wire stretched between the two when deployed, a conductive metal net that becomes a mirror surface portion of the deployable truss antenna, and a net adjustment nut attached to a mandrel that adjusts the shape of the net when deployed; A net fixing device that supports the net that becomes a mirror surface with the connector and the net adjustment nut, and further includes a main sliding hinge portion on the lower side, one peripheral connector on the mandrel, and a peripheral connector on the mandrel when the deployable truss antenna is stored. A deployable truss antenna characterized by a rectangular wire made of connectors that is shaped into a flat, band-like shape.