JPH02141104A - Expansion truss antenna - Google Patents

Abstract

PURPOSE:To prevent ring shape twist and to form an expansion truss antenna with high expansion reliability by using a cable in which no twist is applied to plural thin wire members but they are only bundled as a member coupling other end of a rib forming a free end of the expansion truss antenna and a coupler. CONSTITUTION:A cable 5 coupling between couplers 2a, between couplers 2b, between couplers 2c, between the couplers 2a and 2c, and between the couplers 2b and 2c is set to cause a tension at the expansion of the expansion truss antenna and formed by having only to bundle plural thin wire members and no twist is exerted thereto. The angle theta is nearly zero in the storage of the antenna, a spring 12 is compressed by a slide hinge 3 and a synchronous slide hinge 7 to store distortion energy and restricted and supported by a retaining cable. With the retaining cable cut off by a detonating fuse or the like according to a command from ground, an elastic force of the spring 12 pushes and stretches a part between the slide hinge theta and the synchronous slide hinge 7 to increase the angle theta thereby expanding the antenna. Finally, the main slide hinge 3 is in press contact onto a stopper 11 and then the expansion is complete. Since no ring twist is caused in the cable in this case, the reliability of expansion is high.

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 space shuttles, Ariane rockets, etc. have improved, and economic benefits have been created for space utilization. In particular, Oya's deployable truss antennas are indispensable for communication in mobile bodies such as ships and vehicles, and their development has been actively carried out.

FIGS. 6 and 7 are diagrams showing conventional deployable truss antennas. Figure 6 shows the unfolded state of the antenna (rl in Figure 2)
Attach the connector (2) to the tip using a nenjibo.

Adjacent mandrels are arranged with their axes opposite to each other. (3) is a main slide hinge 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 the opposite direction to the mandrel (11).

Thereafter, the connector on the top side of the deployable truss antenna (2a
) # Connectors on the lower surface side (2b)
(20) We will call it separately.

(5) is the connector (2a) between # (2b) between each other,
(20) Mutual, (2a) and (20 questions and (2b)
and (2C), and is set to generate tension when the deployable truss antenna is deployed.

(6) is the connector (2a) on the top side and the connector (2a) on the bottom side.
b), (diagonal member that connects the two by pin connection, (7)
(8) is a synchronous slide hinge that slides on a shaft between the connector (2) and the main slide hinge (3), and (8) is connected to the synchronous slide hinge (7) with a pin at one end, and the other end is connected to a rib (4). ) A pin-coupled sync on top indicates SY. (9) is a conductive metal net that serves as the mirror surface of the truss antenna; (IG is the net) (9)f:) A net fixture to be fixed to the truss antenna.

Figure 7 is an enlarged view of part C in Figure 6, and in Figure 2 (11 is the mandrel with the connector (2) attached to the tip, (5) is the rib that becomes the free end of the deployable truss structure). This is a wire that connects the ends and the connectors and is stretched between the connectors when the deployable truss antenna is deployed.

Next, the operation will be explained. When the antenna is in the retracted state, the angle formed by the rib (4) and the mandrel (1) is approximately zep.

The spring α2 is compressed by the main slide hinge (3) and the synchronized slide hinge (7) to accumulate strain energy, and is restrained and held in this state by a holding cable (not shown). In response to a command from the ground, the holding cable is cut by a detonator, etc., and the spring force of the spring (12) pushes apart the space between the main slide hinge (3) and the synchronized slide hinge (7), thereby separating the rib (4) and the mandrel ( 11 increases and the antenna expands, and finally the main slide hinge (3) hits the stopper aD and the expansion ends.When the antenna expands.

Since the distance between the tension points at both ends of the wire (5) is increased, tension is generated, and play in the hinge portion is eliminated, resulting in a highly rigid structure.

[Problem to be solved by the invention]

In a conventional deployable truss antenna, a wire made by twisting and bundling a plurality of thin wires is used as a member for connecting the other end of the rib, which is the free end of the deployable truss structure, and the connectors. However, the wire often twists in its shape when stored, creating a ring-shaped part, and when a ring-shaped part is formed, it hangs on other components, etc. There are many cases where it is impossible to fully deploy the ring because the ring is stored away or the ring remains in a lump shape after deployment.

Significantly reduces deployment reliability.

This departure F! Item A was developed to solve the above problem, and provides a deployment truss antenna with high deployment reliability.

[Means to solve the problem]

In the deployable truss antenna according to the first aspect of the present invention, a plurality of thin wire rods are used as a member to connect the other end of the rib, which is the free end of the deployable truss structure, and the above-mentioned connectors, so that the bending rigidity does not become large. Use cables that are simply bundled without twisting.

The deployable truss antenna according to the second aspect of the present invention has a rectangular cross section that has high screw rigidity and is difficult to twist, as a member that connects the other end of the rib, which is the free end of the deployable truss structure, and the connectors. Use a flat cable.

[Effect]

In the first aspect of the present invention, as a member that connects the other end of the rib, which is the free end of the deployable truss structure, and the above-mentioned connectors, the cable is made by simply bundling a plurality of thin wires and does not need to be screwed. By using the connecting member, the bending rigidity of the connecting member is small, and even if the connecting member is bent greatly, no large stress will be generated. The ring-shaped torsion occurs because the large bending stress generated in the two members is released in the torsion direction, so by preventing this stress from occurring, this torsion can be prevented, and the ring-shaped torsion occurs. To prevent the ring from becoming impossible to fully deploy due to the formation of a ring that hangs on other components, or the ring remaining in a lump shape after deployment. Can be done.

In the second aspect of the present invention, a flat cable having a rectangular cross section with high screw stiffness is used as a member to connect the other end of the rib, which is the free end of the deployable truss structure, and the connectors. Due to the fact that the ring-shaped part is difficult to cause twisting, the ring-shaped part may hang on other components, or the ring may remain in a lump-like shape after deployment. This can prevent sufficient expansion from becoming impossible.

〔Example〕

Figures 1 to 5 are diagrams showing embodiments of the present invention.

The first factor shows the unfolded state of the antenna (11 is a centrifugal rod with a connector (21) attached to the tip, and adjacent rods are arranged with their axes opposite to each other.

(3) is the main slide hinge that slides on the mandrel (11).

(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 (11), which is an adjacent mandrel ( Connector on 11 (pin-coupled to 21. Hereafter,
The connector on the upper surface side of the deployable truss antenna is (2a), and the connector on the lower surface side is (2b) eFurthermore, the connector 'e (2('
).

(5) is between the connectors (2a), (21)) between each other, (2c) between t (za) and (2C), and (2
A cable connecting b) and (20), which is set to generate tension when the deployable truss antenna is deployed.In the first invention of the present invention, a plurality of thin wires are simply bundled together and a screw is added. In the second aspect of the present invention, it is a flat cable with a rectangular cross section and a high torsional rigidity.Hereinafter, when these two types of cables are collectively referred to, they will simply be referred to as cables.

r6) is the connector (2a) on the top side and the connector (2a) on the bottom side.
b) a diagonal member that connects (2(')) with a pin connection;
(7) is a synchronous slide hinge that slides on the shaft between the connector [21 and the main slide hinge (3); (8) has one end connected to the synchronous slide hinge (7) with a pin, and the other end connected to a rib ( 4) The sync pinned above indicates SY. (9)
is a conductive metal net that becomes the mirror surface of the truss antenna, and al is a net fixture for fixing the net (91) to the truss.

Figure 2 is an enlarged view of part A in Figure 1, where in is the stopper that determines the bottom dead center of the main slide hinge (3) when the antenna is deployed, (L2 is the coil spring that provides the deployment driving force, and θ is the mandrel ( 1) and the rib (41), which is set to be around 90 degrees when the antenna is deployed.

3 and 4 are enlarged views of section B in FIG. 1. Third
Figure 1B shows the case where the first invention of this invention is implemented.
This is an enlarged view of the part, (5) is between the connectors (2a), (2") between each other, (between two, (2a) and (2)
Question 9 and (2b) and (20) This is a cable that is made by simply bundling multiple thin wires and is not twisted. Figure 4 shows the cable shown in Figure 1B when the second invention of this invention is implemented. This is an enlarged view of the part, (5) is between the connectors (2a),
(2b) Mutual, (2ri mutual.

The screws connecting (2a) and (20 questions) and (2b) and (2C) are flat cables with a rectangular cross section and high rigidity.

Next, I will clarify the operation. In the stowed state of the antenna, the angle θ shown in Fig. 2 is almost zero, and the spring az is compressed by the main slide hinge (3) and the synchronous slide hinge (7), accumulating strain energy. It is restrained and held by a holding cable not shown. In response to a command from the ground, the holding cable is cut by a detonator, etc., and the main slide hinge (3) is
By expanding the gap between the main slide hinge (3) and the synchronous slide hinge (710), the angle θ increases and the antenna is deployed.Finally, the main slide hinge (3) hits the stopper a11 and the deployment is completed.Figure 5 shows the state in the middle of deployment. Since there is no ring-shaped twist in the cable, the reliability for deployment is very high.

〔Effect of the invention〕

As described above, the first aspect of the present invention is to use a screw thread simply by bundling a plurality of thin wires as a member for connecting the other end of the rib, which is the free end of the deployable truss structure, and the connectors. By using a cable that does not add stress, ring-shaped twisting can be prevented.

Often, a ring-shaped part is formed, which may hang on other components, or the ring may remain in a lump-like shape after deployment, making it impossible to fully deploy it. It has the effect of preventing

In addition, the second invention of the present invention provides a ring by using a flat cable with a rectangular cross section with high screw stiffness as a member for connecting the other end of the rib, which is the free end of the deployable truss structure, and the above-mentioned connectors. It is difficult to cause twisting,
If a ring-shaped part is formed, it may hang on other components, or it may remain in a lump shape after deployment, making it impossible to fully deploy it. This has the effect of preventing this from happening.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a deployable truss antenna after deployment showing one embodiment of the present invention, FIG. FIG. 3 is a diagram showing the shape of a cable in an embodiment of the invention; FIG. Fig. 5 is a diagram showing a state in the middle of deployment in an embodiment of the present invention, Fig. 6 is a diagram showing the formation of a deployable truss antenna after deployment in a conventional example, and Fig. 7 is a diagram showing the shape of a cable in a conventional example. It is a diagram. In the figure (ri is the stem, (2) is the connector, (3) is the main slide hinge, (4) is the rib, (5) is the cable, (6) is the
) is a diagonal member, (71 is a synchronous slide hinge, (8) is a synchronous beam, (9) is a metal net, αG is a net fixture, αυ
is a stopper (13 is a coil spring. In the figures, the same reference numerals indicate the same or corresponding parts. Fig. 1

Claims (2)

[Claims] (1) A mandrel to which a connector having a pin joint portion is coupled 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; six ribs that can be expanded in directions perpendicular to the axial direction of the mandrel, 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 six synchronous beams whose other ends are pin-coupled to the six ribs, and a coil spring provided between the main slide hinge and the synchronous slide hinge, and the axles are arranged in opposite directions. The ribs are arranged in such a way that 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. and a plurality of thin frames that connect the other ends of the ribs, which are the free ends of the deployable truss structure, and the connectors, and are stretched between the respective connectors when the deployable truss antenna is deployed. A deployable truss antenna characterized by comprising a cable made of bundled wire materials and a conductive metal net. (2) a mandrel to which a connector having a pin joint portion is coupled at one end and a stopper at the other end; a main slide hinge that slides the mandrel; one end is radially pin-coupled to the main slide hinge; six ribs that can be expanded in directions perpendicular to the axial direction of the mandrel, 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 six synchronous beams whose other ends are pin-coupled to the six ribs, and a coil spring provided between the main slide hinge and the synchronous slide hinge, and the axles are arranged in opposite directions. The ribs are arranged in such a way that 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 flat cable that connects the other ends of the ribs, which are the free ends of the deployable truss structure, and the connectors, and is stretched between the connectors when the deployable truss antenna is deployed; A deployable truss antenna characterized by comprising a conductive metal net.