JPH02295206A - Expandable trans form antenna - Google Patents

Abstract

PURPOSE:To attain a stable structure and the high rigidity for an expandable trans form antenna by producing the compression force to a sleeve with the wires stretched mutually among apexes forming an N pyramid (N=4, 6) and securing a balanced state of force. CONSTITUTION:The bars are stretched mutually among apexes forming an N pyramid (N=4, 6). The wires 13 are used to secure connection between a stopper 16 set on a shaft 10 and the center part of the bar and stretched when an expandable trans form antenna is expanded. A wire 22 is continuously stretched until a main slide pin 11 hits the stopper 16, and this stretched wire 22 presses a coupler 3 toward a rib 12. Thus no pin coupling part exists. Thus it is possible to obtain an expandable trans form antenna which has a structurally stable form together with high rigidity when it is expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lightweight deployable truss antenna that has high storability.

[Conventional technology]

In recent years, the performance and reliability of space shuttles, Ariane rockets, etc. have improved, creating economic benefits for space applications. 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 the deployable structure method is believed to be the most economical way to construct huge antennas in space.

Figure 5 shows the above deployment truss antenna. American academic journal 1
'-Eng IEE TR▲N8AO'l'Eng ON8 A
NDPROPAGATIONSJ▲P-11 No.4 (t
This is a diagram showing a conventional deployable truss structure shown in 2013 (SGS). In the diagram, (1) constitutes a triangular lattice on the upper and lower surfaces of this truss structure, with bends that can be bent at the center. (21 is a diagonal member that supports the triangular lattice on the upper and lower surfaces, <3
》 is the connector that connects the bent member (11) and the diagonal member (2) with a pin. The faG diagram is an enlarged view of the part ▲ surrounded by the broken line circle in Figure 5, and (4) is The web is provided around the connector (3), and its bends connect the hinge member (1) and diagonal member (2) to the connector (3) with pins.

Fig. 7 is an enlarged view of part B surrounded by the broken line circle in Fig. 5, and shows the details of the part where the bend is in the center of member (1). 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 bending portion unfolds the flap member (1). direction above hinge lever (5
), and (7) is a connecting pin (7a) that connects the hinge lever (5) with the bent member (1).
) and (7b) are pins that connect the pinge lever (5) and the bendable member (1), and (7c) is a connecting pin that connects the bendable member (11) at the center.

The above structure has a structure in which a plurality of tetrahedrons each made up of #3 bent members, three diagonal members (2), and three connectors (3) are connected, so the four sides are Also called body truss antenna. Figure 8 is a diagram showing the above-mentioned deployable truss antenna in the middle of deployment. Also, note the wires during deployment. Treatments are shown in %.

Next, the operation will be explained. The above-mentioned antenna, which is initially restrained by a holding cable (not shown) in its retracted form, becomes movable (by cutting the holding cable with a detonator, etc.) upon command from the ground, and then the antenna is moved by the spring force of the spiral spring (6). Start of expansion.

The hinge lever (to) is deployed by the spring force of the spiral spring 6.
By rotating the member (1), the member (1) is rotated and extended by the connecting pin (7C times). bend)
Due to the extension of the member (1), the connectors (3) on the upper and lower surfaces spread radially and the expansion progresses.When the bent member (1) extends linearly, the hinge lever (5) and the spiral The rotational torque generated by the spring force and the contact surface pressure on the bent surface of the bent member (1) are balanced, and the bent member +1) stops moving. This is the developed shape, and the structure is connected only by a triangular lattice. A triangular lattice is basically a rigid and stable structure, and conventionally this type of structure was considered to be a very rigid structure and suitable for a deployable antenna structure.

[Problem to be solved by the invention]

In the conventional structure, the connection points of each member are actually concentrated at one point, so it is a soft structure that 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 Figure 9, but in the conventional structure, this triangular lattice is rigid at the first point.
As shown in Figure 0, there are many hinge connection points, resulting in either a lack of rigidity or an unstable link structure. In addition, in Figures 9 and 10 (
8) is a basic member j that forms a triangular lattice (9) is a pin join that connects the basic member (8)}, +31 is a connector that connects the basic member (8) through the pin joint (9). be.

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 stowed state to the deployed state, the wire a3 that stretches between the connectors on the lower side of the antenna hangs down approximately parallel to the mandrel alm when it is retracted and becomes entangled with the mandrel al1. ) There was also the problem that the gap between the connectors (3) widened and the wire tension caused the mandrel to bend and break.

This invention was made to solve the above problems, and the shape after deployment is structurally stable and has high rigidity. The present invention provides a non-b deployable truss antenna that is not damaged by bending due to wire during deployment.

[Means to solve the problem]

The deployable truss antenna according to the present invention has a connector having a pin joint at one end and a stem having a stopper at the other end, and slides on the stem when deployed, and finally stops when it hits the stopper. A main slide hinge, N (N is 4, 6) ribs extending radially with one end pin-coupled to the main slide hinge, a synchronous slide hinge that slides between one end of the mandrel and the main slide hinge, and one end of which extends radially. It is radially pin-coupled to the synchronous slide hinge above. and 7s5y synchronous beams whose other ends are pin-coupled to the N ribs, and a coil spring provided between the main slide hinge and the synchronous slide hinge, and the direction of the mandrel is reversed. The ribs are arranged in such a way that the ribs are arranged in the same direction, and the ribs excluding the rib that becomes the free end of the deployable truss antenna are connected to the 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 with the mandrels having 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. A wire that is provided between the other end of the rib and the above-mentioned connectors and is stretched between each when the deployable truss antenna is deployed, and a peripheral connection between the lower main slide hinge portion of the deployable truss antenna and the mandrel. It is equipped with a joint where the rigid wire within the rectangle formed by the child and its adjacent connectors is bent to prevent the rigid wire from damaging the mandrel during deployment.

[Effect]

In this invention K, the wire stretched between the vertices of the N (N is 4.6) pyramid generates a compressive force on the ribs and achieves a force equilibrium state, so the pin connection is achieved. The looseness of the parts that have been removed disappears, and the N-pyramid, which is the basic module, has a safe structure and can easily achieve high rigidity. moreover. Above N
Since the pyramids expand synchronously, the reliability of expansion increases, and the force of the spring and external energy to expand the N pyramids become unnecessary.

Also. The wire rod bent during storage is located approximately in the center of the rectangle υ formed by the connector, and during unfolding the wire rod will not come close to the mandrel and get caught.

〔Example〕

Figure 1 is a diagram showing a hexagonal pyramidal deployable truss antenna in an expanded configuration, showing an embodiment of the present invention. <<2>> is a diagonal member,
(3a)? (31)) is a connector with a pin joint. C5C-) is a connector provided at the other end of the rib that is the free end of the deployable truss antenna, and the diagonal member (2) is the connector (3a) on the upper surface side and the connector (3b) (3c) on the lower surface side.
) are connected by pin connection. α● is a mandrel with a connector (3) attached to its tip, and adjacent mandrels are arranged with their axes opposite to each other. αD is a main slide hinge that slides on the mandrel αυ, α2 is a rib whose one end is radially pin-coupled to the main slide hinge (11+) and can be expanded in the direction K perpendicular to the axial direction of the mandrel; The connector (3b) is attached to the opposite direction of the connector (3a) above, and is attached to the adjacent mandrel +11 in the opposite direction.
is pin-coupled to.

The rib serving as the free end of the above deployable truss antenna is connected to the connector (3C).

■ is a connector (3a) attached to the tip of the shaft aO.
) between each other, (3b) between each other, between the connectors (3C) placed on the free ends of the deployable truss antennas, and between the peripheral connectors (3a) mounted on the mandrel and the deployable truss antennas. The connector (a rigid wire attached between the three connectors arranged at the free end) is set so as to be pulled when the deployable truss antenna is deployed.

a4 is a synchronous slide hinge that slides on the shaft between the connector (3) and the main slide hinge (If), (to) is a synchronous slide hinge that has one end connected to the above synchronous slide hinge O, and the other end pinned to the rib α2. Combined to show telepathic beams. aS is a conductive metal net that becomes the mirror surface of the deployable truss antenna, and α9 supports the shape when deployed and stored. This is a net fixture for fixing the floor.

Figure 2 is an enlarged view of section C in Figure 1, and ae is the stopper that determines the bottom dead center of the main slide hinge aB when it is deployed.
(+7> is a coil spring that provides the driving force to deploy the deployable truss structure of the present invention, and θ is the angle formed by the shaft α1 and the rib a2, and 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 is an enlarged view of part D in Figure 3, and shows the net adjustment nut for adjusting the shape of the net on the lower side of each Kansha shaft (an) below the deployable truss antenna. Side main slide hinge connector (3) and peripheral connector (3a)
The following describes the deployment operation of the deployable truss antenna configured as described above. When the deployable truss antenna of the present invention is stored, the connector on the axle aI, for example (3a), the main slide hinge all on the axle, and the other end of the rib σ2 whose one end is pin-coupled to the slide hinge αD. Another connected connector, for example, a triangle with three vertices at (3b), collapses and the angle θ between the rib a2 and the axis α0 shown in Figure 2 becomes zero, and as shown in Figure 4. As shown, the wire rod at the bottom of the above deployable truss antenna. @ is joint Q1
It can be bent at l. Deployment is performed by pushing apart the main slide hinge a1l and the synchronous slide hinge a4 by the spring force of the coil spring fin shown in FIG. When the distance between the main slide hinge (lυ) and the synchronous slide hinge α increases, the distance between the connector (3a) on the axle aO and the main slide hinge αD increases. The distance to another connector (5'F3) is maintained at a constant length by the diagonal member <<2>, and furthermore, the distance from the other connector (5'F3)
3b) and the main slide hinge αD is also the distance between the rib (1
2, the triangle formed by the three vertices expands and becomes the angle θ between the rib α2 and the axle aυ.
increases, the above-mentioned another connector (3b) and another rib α2 whose one end is pin-connected to the above-mentioned main slide hinge all
The distance between further connectors provided at the other end, such as (3C), also increases. Along with the expansion of the triangle, the connector (3) of the main slide hinge α9 on the lower surface side of the deployable truss antenna, the peripheral connector (3a), and the peripheral connector (
The rectangle formed by the connector (3C) adjacent to 3a) also expands, and the wire υ bent at the joint 21) also gains tension and expands from the connector {3). When the slide hinge αυ comes close to the stopper α0, the upper side connectors (3a), the lower side connectors (3a), (3
c) Connector (3a) between each other and at the free end on the top side
The wire rod (A) between the connector (3C) on the free end of the lower surface side and the stopper (I0 is stretched between them and joined by the tension of the wire rod (to) on the lower surface side} 011) is bent. The wire rod (self) that was attached to the main slide hinge (il1
The wire becomes almost straight before it hits the stopper α0. From the retracted state to the unfolded state, the joint Q
D is made by bending the wire 4 at approximately the center of the rectangle made by the connector (3). For this reason, the wire (to) is the mandrel α●
This prevents the axle α0 from being damaged. The above wire rod (self) has main slide hinge α9 as stopper α0
It will continue to be stretched until it hits. Since the stretched wire presses the connector (3) toward the rib (16) side, the deployable truss antenna becomes a highly rigid antenna without a pin joint.

〔Effect of the invention〕

As described above, the present invention is based on a bar stretched between the vertices of an N-pyramid. By connecting the stopper on the mandrel and the central part of the bar, and by providing a wire that is stretched between them when the deployable truss antenna is deployed, a structure without backlash can be achieved, making it easy to obtain high rigidity. Furthermore, since the wire is bent at the joint, it is easy to prevent damage to the mandrel, wire, and wire due to wobbling of the wire during the unfolding operation.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a deployable truss antenna showing an embodiment of the present invention, Fig. 2 is a diagram showing a member coupling portion in an embodiment of the present invention, and Fig. 3 is a diagram showing an embodiment of the present invention in the middle of deployment. FIG. 4 is a diagram showing the installed state of the embodiment of the present invention, FIG. 5 is a diagram of the conventional example after development, and FIG.
The figure shows the diagonal member joining part in the conventional example, Figure 1 shows the mechanism of the member (bent triangular lattice) in the conventional example, and Figure 8 shows the shape of the conventional example in the middle of expansion. 9 are physical model diagrams of a conventional triangular lattice, and Figure 10 is an actual physical model diagram of a conventional triangular lattice. In the figure. (1) is a folded member. (2) is the diagonal member, (3) is the connector, (4) is the web, (5} is the hinge lever, (6) is the spiral bar, +71 is the connecting pin, (8)
is the basic member, 《9) is the pin joint, a1 is the mandrel,
αD is the main slide hinge, a'a is the rib, (l3 is the wire, a4 is the synchronous slide hinge, α9 is the synchronous beam. α
0 is stopper αη is coil spring, α■ is net, α
The hot water is a net fixture, the kiln is a net adjustment nut, the jsit is a joint, c! 2 is a wire rod. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig.

Claims (1)

[Claims] A connector having a pin joint part at one end is connected,
and a mandrel having a stopper, a main slide hinge sliding on the mandrel, one end of which is radially pin-coupled to the main slide hinge, and N (N 4 and 6) ribs, 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 the other end of which is connected to the N ribs, respectively. It is equipped with N synchronous beams connected by pins, a coil spring provided between the main slide hinge and the synchronous slide hinge, and is arranged such that the directions of the axles are opposite to each other, and the deployable truss antenna is A plurality of frames formed by connecting ribs other than the free end ribs with connectors on mandrels facing in opposite directions, and joining connectors on the mandrels facing in opposite directions with diagonal members; Connecting the connectors on the shaft with the same values, the other ends of the ribs that are the free ends of the deployable truss antenna, and the other ends of the ribs that are the free ends of the deployable truss antenna and the connectors. When the deployable truss antenna is deployed, a wire is stretched between each other, a conductive metal net that becomes a mirror surface part of the deployable truss antenna, and a core that adjusts the shape of the net when deployed. and a net fixing device that supports the net that forms a mirror surface on the connector and the net adjustment nut, and furthermore, when the deployable truss antenna is stored, the main slide hinge part on the lower side and the main slide part on the mandrel are installed. A deployable truss antenna characterized by comprising a wire having a certain degree of rigidity and a joint in the center within a rectangular shape formed by one peripheral connector and adjacent connectors.