JP2611235B2 - Membrane surface structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a membrane surface structure, and more particularly to a membrane surface structure used for a tension membrane structure method of a deployable structure mounted on a spacecraft.

[Conventional technology]

Deployable structures mounted on space vehicles are required to be lightweight, compact in the retracted state at launch, high rigidity in the deployed state, and required to deploy and re-deploy securely. It is being addressed by the film structure method.

FIG. 2 is a perspective view showing an example of such a tension membrane structure system, in which (a) shows a housed state and (b) shows a state after development.

A plurality of membrane surface structures 14 connected to each other by a multi-stage hinge,
In the housed state, it is housed in a membrane structure housing case 7 provided on the outer wall of the spacecraft 6 and covered with a housing lid 10. In the unfolded state, the tension is applied to each membrane surface structure 14 by the extension / re-storage mast 8 and the tension loading mechanism 10, thereby securing the rigidity of the entire tension membrane structure.

FIG. 3 is a drawing showing a film surface structure 14 which is an example of a conventional film surface structure. FIG. 3 (a) is a front view, and FIG. 3 (b) is a partial cross-sectional view along line BB in FIG.

In the film surface structure 14, the film surface 5 is adhered and fixed to the replenishment frame 4 for smoothness and reliability of deployment and re-storage, so that the film surface 5 has an out-of-plane rigidity.

[Problems to be solved by the invention]

In the conventional membrane structure 14 described above, the tension applied to the membrane structure 14 in order to secure the rigidity of the entire tension membrane structure after deployment is determined by the rigidity ratio between the membrane surface 5 and the reinforcing frame 4 in the tension load direction. As a result, the tension applied to the membrane surface 5 is smaller than the tension applied to the membrane surface structure 14, and the effect on increasing the rigidity of the tension is poor.
There is a disadvantage in that a larger tension is applied to the mast 14 and, consequently, the size and weight of the extension / re-storage mast 8 that supports the entire membrane structure 14 increases. In addition, it is very difficult to bond the membrane surface 5 to the reinforcing frame 4 without causing wrinkles on the membrane surface 5 during the production of the membrane surface structure 14, and the dynamic characteristics of the wrinkled membrane surface structure 14 are not good. There has been a drawback that has certainty. Further, even when the membrane surface structure 14 is thermally deformed in a state after deployment in a space environment, the structure in which the membrane surface 5 and the reinforcing frame 4 are integrated is a temperature difference between the membrane surface 5 and the reinforcing frame 4. In addition, due to the difference in the coefficient of thermal expansion of each material, bending deformation occurs like bimetal, and the performance of the entire structure
There was a disadvantage that the function was impaired.

[Means for solving the problem]

The membrane surface structure of the present invention includes a membrane surface, a reinforcement frame formed to reinforce the out-of-plane rigidity of the membrane surface, and the reinforcement frame and the reinforcement frame against in-plane deformation of the reinforcement frame and the membrane surface in a space environment. A fixing membrane is provided which wraps at least a part of the reinforcing frame and secures the membrane to the membrane surface so that the membrane surface can move relatively freely.

〔Example〕

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 shows a film surface structure according to an embodiment of the present invention.
11 is a drawing showing (11), (a) is a front view, (b) is (a)
3 is a partial cross-sectional view taken along line AA in FIG.

The membrane surface 1 is integrally formed with a multi-stage hinge 13 connecting the membrane structures 11, and the reinforcing frame 3 is wrapped by the fixed membrane 2 fixed to the membrane surface 1 and held on the membrane surface 1.

Between the supply frame 3 and the film surface 1 and the fixed film 2, the first
As shown in FIG. 2B, by securing a sufficient clearance so as not to prevent the thermal expansion and thermal contraction of the membrane surface 1 and the reinforcing frame 3, when the membrane surface structure 11 is thermally deformed in a space environment, Can be avoided. In addition, when a tension in the in-plane direction is applied to the film surface structure 11, the tension is applied only to the film surface 1, so that the tension acts efficiently to increase the rigidity of the film surface structure 11.

〔The invention's effect〕

As described above, the present invention holds the reinforcing frame with the fixed film 2 so that the reinforcing frame can move in the in-plane direction of the membrane surface, so that the in-plane tension is applied to the membrane surface structure. Even if wrinkles occur on the membrane surface during manufacturing, tension is applied to only the membrane surface irrespective of the rigidity of the reinforcing frame, so that the wrinkles on the membrane surface are extended and the dynamic characteristics of the entire tension membrane structure can be grasped. Not only cost reduction of dynamic characteristic analysis but also improvement of attitude / orbit control accuracy by improving dynamic characteristic accuracy of tension membrane structure, which is a design parameter used in attitude / orbit control design of spacecraft In addition, since the out-of-plane deformation of the film surface structure is reduced, the accuracy of maintaining the shape of the tension film structure as a whole is increased, and there is an effect that the change in the center of gravity is reduced.

[Brief description of the drawings]

FIG. 1 shows a film surface structure 11 according to an embodiment of the present invention.
(A) is a front view, (b) is a partial cross-sectional view along the line AA in (a), FIG. 2 is a perspective view showing an example of a tension membrane structure system,
(A) shows a stored state, (b) shows a state after expansion, FIG. 3 is a drawing showing a film surface structure 14 which is an example of a conventional film surface structure, (a) is a front view, (b) () Is a partial cross-sectional view along line BB in (a). 1 ... membrane surface, 2 ... fixed membrane, 3 ... reinforcement frame, 11 ...
… Membrane surface structure, 12… shaft for multi-stage hinge, 13 …… multi-stage hinge.

Claims (1)

(57) [Claims] 1. A membrane surface, a reinforcement frame formed to reinforce the out-of-plane rigidity of the membrane surface, and the reinforcement frame and the membrane surface against in-plane deformation of the reinforcement frame and the membrane surface in a space environment. A fixing membrane that wraps at least a part of the reinforcing frame with a margin enough to relatively freely move and that is fixed to the membrane surface.