JPH02241208A - Expansion truss antenna - Google Patents

Abstract

PURPOSE:To constitute an antenna so that a bag is extended to the outside and a wise and a net are pushed out of a truss at the time of store and it is prevented that the wise and the net are entangled, respectively and the expansion becomes impossible at the time of expansion by filling the inside of the bag stretched so as to envelop a truss structure with dilute gas. CONSTITUTION:In a state that an antenna is contained, an angle theta is nearly zero, and a spring 12 is compressed by a main slide hinge 3 and a synchronizing slide hinge 7 and accumulates strain energy. In this state, a holding cable is cut by a detonator, etc., by a command from the ground, and a part between the main slide hinge 3 and the synchronizing slide hinge 7 is spread out by spring force, by which the angle theta increases and the antenna expands, and in the end, the main slit hinge 3 hits against a stopper 11 and the expansion is ended. At the time of store, since dilute gas 14 is compressed, pressure in the inside of a bag 13 rises, and accordingly, a wire 5 and a net 9 expand to the outside so as to be pushed out by the bag 13, therefore, it does not occur that the net 9 and the wire 5 are caught by the main slide hinge 3 and the synchronizing slide hinge 7 or the coil spring 12, and each wire 5 and each net 9 are entangled.

Description

[Detailed description of the invention] [Industrial application field] This invention has high storage performance and deployment reliability.

This invention relates to a lightweight deployable truss antenna.

[Conventional technology]

In recent years, the performance and reliability of the Space Shuttle, Ariane U-ketsu, etc. have improved, creating economic benefits for space use. Particularly large deployable truss antennas are suitable for ships,
It is indispensable for communication in mobile objects such as vehicles, and its development has been actively carried out.

FIGS. 3 to 5 are diagrams showing conventional developed l-las andena. Figure 3 shows the unfolded state of the antenna.
) is a mandrel with a knot (2) attached to the tip.

Adjacent mandrels are arranged with their axes opposite to each other. (3) is a main slide pin that slides on the mandrel (1), and (4) is a rib whose one end is radially pin-coupled to the main slide hinge (3) and can be expanded perpendicular to the axis of the mandrel. , is pin-coupled to a connector (2) on an adjacent mandrel (1) arranged in an opposite direction to the mandrel (1).

Thereafter, the connector on the top side of the deployable truss antenna (2a
), the connector on the bottom side is (2b), and the connector located on the periphery of the upper and lower surfaces of the deployable truss antenna is (2b).
C).

(5) is the connector (2a) between each other, (2b) between each other,
(2c) between each other, (2a) and (2C) and (2b)
) and (2C), and is set to generate tension when the deployable truss antenna is deployed.

(6) is the connector on the top side (c) and the connector on the bottom side (2b).
), (2c) are connected by pin connection.

(7) is a synchronous slide hinge that slides on the shaft between the connector (2) and the main slide hinge (3), (8) is connected to the synchronous slide hinge (7) with a pin at one end, and the other end is connected to the synchronous slide hinge (7) with a pin. The synchronous beam pin-coupled to the rib (4) is shown. (9) is a conductive metal net that becomes the mirror surface of the truss antenna, and 00 is a net fixture for fixing the net I- (91) to the truss. It is.

Figure 4 is an enlarged view of part A in Figure 3, where (11) l determines the bottom dead center of the main slide hinge (3) when the antenna is deployed, and (12) provides the deployment driving force. In the coil spring, θ indicates the angle formed between the mandrel (1) and the rib (4), and is set to be around 90 degrees when the antenna is deployed.

Next, the operation will be explained. In the stowed state of the antenna, the angle θ shown in FIG. 4 is almost zero, and the spring (12) is compressed by the main slide hinge (3) and the synchronized slide hinge (7) and stores strain energy.

This state is restrained and held by a holding cable (not shown). The holding cable is cut by a detonator or the like in response to a command from the ground, and the spring force of the spring (12) pushes the space between the main slide hinge (3) and the synchronous slide hinge (7) apart, thereby increasing the angle θ. The antenna unfolds and finally the main slide hinge (3) moves to the stopper (11).
) and the expansion ends.

FIG. 5 shows the state in the middle of development. When the antenna is deployed, the distance between the tension points at both ends of the wire (5) increases, generating tension and eliminating play in the hinge portion, resulting in a highly rigid structure.

[Problem to be solved by the invention]

In the conventional structure, the net I-[91 and the wire (5) hang down inside the truss structure as shown in Figure 5 when stored, and the main slide hinge (3) and the synchronous slide hinge (7)
) or the wires (5), the nets (9), or the wires (5) and the net (9) become entangled with each other, which creates an abnormally high tension in the net (9) or wire (5) when deployed. There was a danger that they would be destroyed.

This invention was made to solve the above-mentioned problems, and provides a deployable truss antenna that is free from the above-mentioned snags and entanglements.

[Means to solve the problem]

The deployable truss structure according to the present invention is one in which an airtight bag attached to a connector and a stopper is filled with diluted gas.

[For production]

In this invention, the net and wire are pushed out of the antenna by the bag when the deployable truss antenna is stored.

[Example] Figs. 1 and 2 are diagrams showing the deployable truss antenna of the invention of B. Figure 1 shows the unfolded state of the antenna.
1) is a mandrel with a connector (2) attached to its tip, and adjacent mandrels are arranged with their axes opposite to each other. (
3) is the main sliding hinge that slides on the mandrel (1);
(4) is a rib whose one end is radially pin-coupled to the main slide hinge (3) and can be expanded perpendicularly to the axis of the mandrel, and the adjacent mandrel (4) is arranged in the opposite direction to the mandrel (1). 1) Pin-coupled to the upper connector (2).

(5) is a wire that connects the connector (2) with each other, and is set to generate tension when the deployable truss antenna is deployed. (6) is a wire that connects the connector (2) on the top side and the lower C6.
) A diagonal member that connects the face-side connector (2) with a pin.

(7) is a synchronous slide hinge that slides on the shaft between the connector (2) and the main slide hinge (3), (8) is the synchronous slide hinge mentioned above: ) One end is connected to (7) with a pin, the other The end of the synchronous beam is connected to the lid (4), and (9) is a conductive metal net that becomes the mirror surface of the truss antenna.

00) is the net fixing tool for fixing the above metal net, Nol'f91 to the lath, (11) is the main slide hinge (3
) is the stopper that determines the bottom dead center, (12) is the coil/L spring that supports the deployment driving force, θ is the mandrel (1) and the rib (4)
The angle is set to be around 90 degrees when Antep is deployed. (13) is an airtight bag, which is wrapped so as to isolate the entire l/lath structure from the outside.

(14) i is the diluted gas filled inside the bag (13).

Next, the operation will be explained. In the stowed state of the antenna, the angle θ shown in FIG. 2 is approximately zero, and the spring (12) is compressed by the main slide hinge (3) and the synchronous slide hinge (7) and stores strain energy.

This state is restrained and held by a holding cape/L, not shown. In response to a command from the ground, the holding cable is cut by a detonator or the like, and the spring force pushes the space between the main slide hinge (3) and the synchronous slide hinge (7) apart, increasing the angle θ and deploying the antenna. Finally, the main slide hinge (3) hits the stopper (11) and the deployment is completed. When the antenna is deployed, the distance between the tension points at both ends of the wire (5) increases, generating tension and eliminating play in the hinge portion, resulting in a highly rigid structure.

During storage, as shown in FIG. 2, the diluted gas (14) is compressed, so the pressure inside one bag (14) increases.

Therefore the wire (5) and the net (9) are connected to the bag (14)
1. It expands outward so that it is pushed out.
(9) and the wire (5) may get caught on the main slide hinge (3), synchronized slide hinge (7) or carp) L spring (12), or the wires (5) or the nets (9) may get tangled with each other. Since there is no problem, high reliability of deployment can be obtained.

〔Effect of the invention〕

As described above, the present invention is made by filling the inside of the T-coat bag with diluted gas, which is stretched to envelop the L-rus structure, so that when it is stored, the bag expands to the outside and pushes out the wires and nets to the outside of the truss. Therefore, it is possible to prevent these from getting caught on the main slide hinge, synchronized slide hinge, coil spring, etc., and to prevent the wires and the net from getting tangled and making it impossible to deploy them.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of a deployable truss antenna after deployment showing an embodiment of B's invention, Fig. 2 is a diagram showing the retracted state of the deployable truss antenna of Fig. 1, and Fig. 3 is a diagram of a conventional deployable truss antenna.・A diagram showing a truss antenna; FIG. 4 is a diagram showing a part A in FIG. 3 where the members are connected; and FIG. In the figure, (1) is the mandrel, (2) is the connector, (3) is the main slide hinge, (4) is the rib, (5) is the cable, (
6) is the oblique part 44, (71 is the synchronous slide hinge, (81
is a synchronous beam, (9) is a metal net I-, GO+ is a net fixture, (11) is a strutsunoma. (12) is a coil spring, (13) is a bag, (14,)
is a dilute gas. In addition, in the two figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A mandrel having a connector having a pin joint at one end and a stopper at the other end, a main slide hinge that slides the mandrel, one end of which is radially pin-coupled to the main slide hinge, and an axis of the mandrel. six ribs that can be expanded in directions perpendicular to the directions, 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 is equipped with six synchronous beams each pin-coupled to the six ribs, and a coil spring provided between the main slide hinge and the synchronous slide hinge, so that the directions of the axles are opposite to each other. The ribs, excluding the rib that becomes the free end of the deployable truss structure, 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. a plurality of frames, the other end of the rib serving as the free end of the deployable truss structure, and the connectors,
A wire stretched between each when the deployable truss antenna is deployed, a conductive net, a bag attached to the connector and the stopper and enveloping the entire deployable truss structure, and a bag inside the bag. A deployable truss antenna comprising: a diluted gas filled with diluted gas;