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A Design Method for Realizing the Folding and Shrinking of the Hexagonal Lens Shade

A design method and technology of hoods, which are applied in the storage field of spacecraft hoods, can solve the problems of size limitation, long length and large volume of hoods, and achieve the effect of breaking through limitations

Active Publication Date: 2020-08-25
SHANGHAI SATELLITE ENG INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The lens hood is a key component of stray light suppression in the optical system. For some optical systems, it is necessary to use a very long lens hood to achieve good results. However, the lens hood is too long and too bulky, and its size is limited by the rocket fairing. The space envelope is limited, so it is necessary to study the storage method for the folding and shrinking of the light shield during the launch phase

Method used

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  • A Design Method for Realizing the Folding and Shrinking of the Hexagonal Lens Shade
  • A Design Method for Realizing the Folding and Shrinking of the Hexagonal Lens Shade
  • A Design Method for Realizing the Folding and Shrinking of the Hexagonal Lens Shade

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Embodiment

[0057] In this embodiment, the present invention needs to store the regular hexagon with height D after unfolding and side length L_out in cross section after being folded and stored in the annular space of Φmin, Φmax, H.

[0058] The present invention realizes the folded storage of the hexagonal prism shade through the following methods.

[0059] Spread the fully unfolded hexagonal prism hood into a plane, and set the side length of the hexagon in the cross-section after the hood is fully unfolded to be the length of the outer side after folding L_out, such as figure 1 shown.

[0060] Set the single folding width d according to the formula (1).

[0061]

[0062] According to the formula (2), the inner side length L_in after folding is obtained.

[0063]

[0064] According to the length L_out of the outer side, the length L_in of the inner side, the single folding width d and the folding angle β=30°, it is obtained as follows image 3 The repeating folding unit shown....

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Abstract

The invention provides a design method for realizing folding and contracting of a hexagonal cylindrical shape, which is suitable for a hood with flexibility and plasticity characteristics. The methodcomprises the following steps: step 1, determining storage space ranges [phi]min, [phi]max, and a storage height H of a folded hood by analysis, obtaining an outer side length L_out and a folding angle beta, and setting an initial value of a single folding width d; step 2, determining an inner side length L_in, a folded height h, an inner envelope size [phi]min1, and an outer envelope size [phi]max1 by geometric relationship analysis; step 3, satisfying a target relationship by controlling the single folding width d: [phi]min <= [phi]min1 <= [phi]max1 <= [phi]max; h <= H. According to the design method for realizing folding and contracting of hexagonal cylindrical shape hood, the limitation of a fairing space on the large size of the hood can be broken by realizing the hood folding storage.

Description

technical field [0001] The invention relates to the storage of a sunshade for a spacecraft, in particular to a design method for realizing the folding and contraction of a hexagonal sunshade. Background technique [0002] The lens hood is a key component of stray light suppression in the optical system. For some optical systems, it is necessary to use a very long lens hood to achieve good results. However, the lens hood is too long and too bulky, and its size is limited by the rocket fairing. The space envelope is limited, so it is necessary to study the storage method for the folding and shrinking of the hood during the launch stage. Contents of the invention [0003] Aiming at the storage space limitation of fairing at the launch stage, the present invention provides a design method for realizing the folding and shrinking of the hexagonal prism shade, which is suitable for the shade with the characteristics of flexibility and plasticity. [0004] To achieve the above ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 吴自帅江世臣盛松杜忠选周砚耕
Owner SHANGHAI SATELLITE ENG INST