CN107037566B - High stability bearing structure of sectional type secondary mirror - Google Patents
High stability bearing structure of sectional type secondary mirror Download PDFInfo
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- CN107037566B CN107037566B CN201710371601.7A CN201710371601A CN107037566B CN 107037566 B CN107037566 B CN 107037566B CN 201710371601 A CN201710371601 A CN 201710371601A CN 107037566 B CN107037566 B CN 107037566B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
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Abstract
A sectional type secondary mirror high-stability supporting structure comprises a first front lens barrel (1), a second front lens barrel (2) and a secondary mirror supporting assembly (3); the secondary mirror support assembly (3) comprises a web assembly (4) and a secondary mirror frame (5); each group of spoke plate components (4) comprises a spoke plate (10) and a spoke plate base; one end of the spoke plate (10) is connected with the spoke plate base, the other end of the spoke plate is connected with the secondary mirror frame (5), and the circular secondary mirror frame (5) is tangent; each spoke plate base is fixedly arranged at one end of a second front lens cone (2) respectively, and the other end of the second front lens cone is connected with a first front lens cone (1). The composite material lens barrel and the flexible web structure realize high-stability support of the secondary mirror. The supporting structure also adopts a three-layer sandwich structure spoke plate structure, so that the weight is reduced, the structural rigidity is improved, and the thermal stress is unloaded to a certain degree.
Description
Technical Field
The invention relates to a supporting structure, and belongs to the technical field of aerospace optical remote sensors.
Background
With the rapid development of the aerospace optical remote sensor technology, the pursuit of higher resolution of the optical remote sensor also puts higher and higher requirements on the structural rigidity and dimensional accuracy of the space optical system. The secondary mirror is one of the key optical components of most space optical remote sensing systems. The supporting structure and method of the secondary reflector play a role in ensuring the surface shape of the mirror surface and the distance between the mirrors, thereby directly influencing the imaging quality of the optical system. The conventional secondary mirror support is supported by a three-bar support. With the increasing aperture of the main mirror and the adoption of the long-focus optical system, the traditional single-rod support design becomes longer and thicker, which not only leads to the increasing weight of the components, but also causes larger obstruction to the incident light of the main mirror. More importantly, the larger the length of the rod, the larger the generated gravity deformation, and the extremely adverse effect on the optical system assembly and the imaging quality is brought. Therefore, a light-weight and highly stable secondary mirror support structure and method are a difficulty in the development of space optical cameras.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention overcomes the defects of the prior art, provides a sectional secondary mirror high-stability supporting structure, solves the problems of heavy weight and large gravity deformation of the traditional three-rod supporting technology in a large-caliber long-focus optical system, and has high stability and reliability.
The technical scheme adopted by the invention is as follows: a high-stability supporting structure of a sectional type secondary mirror comprises a first front lens barrel, a second front lens barrel and a secondary mirror supporting assembly; the secondary mirror support assembly comprises a web assembly and a secondary mirror frame; each group of spoke plate components comprises a spoke plate and a spoke plate base; one end of the spoke plate is connected with the spoke plate base, the other end of the spoke plate is connected with the secondary mirror frame, and the round secondary mirror frame is tangent to the spoke plate base; and each spoke plate base is fixedly arranged at one end of the second front lens cone respectively, and the other end of the second front lens cone is connected with the first front lens cone.
The first front lens cone is frustum-shaped, the large end of the first front lens cone is connected with external equipment through an end flange, and the small end of the first front lens cone is connected with the second front lens cone.
The second front lens barrel is cylindrical and is fixedly connected with the spoke plate bases through end flanges.
The spoke plate base comprises a fixed end and a moving end; the fixed end is connected with a flange at the end part of the second front lens cone; the moving end is a rectangular plate, and two sides of the moving end are respectively connected with the fixed end and the radial plate; the moving end is provided with two unloading grooves which are parallel to each other and parallel to the edge of the web plate connected with the moving end; the opening positions of the two unloading grooves are respectively positioned on two opposite sides of the moving end.
The spoke plate components are provided with three groups, and the tangential point positions of the spoke plate and the secondary mirror frame are uniformly distributed on the secondary mirror frame along the circumferential direction.
The secondary mirror supporting assembly further comprises a limiting block used for limiting the position of the secondary mirror, and the limiting block is installed on the secondary mirror frame.
The spoke plate is of a three-layer sandwich structure and comprises a core plate, reinforcing plates and skins, wherein the core plate is arranged in the middle layer, the reinforcing plates are arranged on two sides of the core plate, the skins wrap the reinforcing plates and the core plate, and the core plate material in the middle layer is invar steel and filled with damping rubber.
The first front lens cone or the flange at the end part of the first front lens cone is made of C/SiC composite material.
The second front lens cone or the flange at the end part of the second front lens cone is made of C/SiC composite material.
Compared with the prior art, the invention has the advantages that:
(1) the invention can provide accurate and stable support for the secondary reflector, and greatly reduce the weight, thereby providing guarantee for the imaging quality of the optical system.
(2) The invention greatly shortens the length of the supporting structure by adding the lens cone structure, and avoids the large cantilever stress state of the slender supporting rod. The lens cone structure is made of light resin-based composite materials with high specific stiffness, and the structure weight is greatly reduced.
(3) The spoke plate is tangentially installed, when thermal stress is generated on the spoke plate, the rigid body displacement of the spoke plate is reduced through the rotation of the secondary mirror and the secondary mirror frame, the position precision of the secondary mirror is guaranteed, the spoke plate is of a three-layer sandwich structure, the core plate of the middle layer is designed in a light weight mode, damping rubber is filled, the advantage of low linear expansion coefficient is achieved, the thermal matching performance with a microcrystalline material is good, and the thermal environment adaptability can be effectively improved.
(4) The spoke plate base is provided with the unloading groove, so that the flexibility of the unloading groove is improved, the relative movement speed of the spoke plate and the spoke plate base during vibration can be increased, the effect of damping rubber in the spoke plate base is enhanced, and the amplitude amplification of the secondary mirror is reduced.
Drawings
FIG. 1 is a schematic view of a support structure of the present invention;
FIG. 2 is a schematic view of the tangential mounting of the web of the present invention;
FIG. 3 is a schematic view of an unloading structure of the spoke plate seat of the present invention;
FIG. 4 is a schematic representation of the sinusoidal response of the rigid support form of the present invention;
FIG. 5 is a graphical representation of the sinusoidal response of the compliant web support form of the present invention.
Detailed Description
As shown in fig. 1, a sectional type secondary mirror high stability supporting structure includes a first front barrel 1, a second front barrel 2 and a secondary mirror supporting assembly 3.
The first front lens cone 1 and the second front lens cone 2 are installed between the primary and secondary mirrors and used for supporting the force bearing lens cone of the secondary mirror assembly. The first front lens cone 1 is in a frustum shape, and the second front lens cone 2 is in a cylindrical shape; the end flange of the large end of the first front lens cone 1 is arranged on the front bearing frame through a screw, and the small end of the first front lens cone is connected with one end of the second front lens cone 2; the flange at the other end of the second front lens barrel 2 is connected with three groups of flexible webs 10 in the secondary mirror support assembly 3 for supporting the secondary mirror assembly. The C/SiC composite material is selected as the material of the first front lens barrel 1 and the second front lens barrel 2 because the specific rigidity of the C/SiC composite material is higher; the end flange of the first front lens cone 1 and the end flange of the second front lens cone 2 are made of C/SiC composite materials, and then are adjusted in relative positions with the front lens cone body to meet the requirements of secondary lens spacing, inclination and eccentricity, the first front lens cone 1 and the second front lens cone 2 are connected by 12 points of 6 groups of circumferential uniform distribution through a preparation gasket, and the requirement of secondary lens optical adjustment axial adjustment is met.
As shown in fig. 2, the secondary mirror supporting assembly 3 is designed by adopting a full invar steel structure and comprises three groups of web assemblies 4, a secondary mirror frame 5 and a limiting block 6, the secondary mirror is designed by adopting a microcrystal material to realize the secondary mirror structure, the structure is in a mushroom head form, and the inclination of the secondary mirror assembly is corrected by correspondingly adopting a secondary mirror counterweight. The supporting mode of the secondary mirror supporting component 3 is a flexible tangential supporting mode, the rigid body displacement influence of thermal stress on the secondary mirror is reduced, the mechanical environment adaptability of the secondary mirror component is improved, and the amplitude amplification of the secondary mirror under the vibration condition is reduced.
As shown in fig. 3, each group of spoke plate assemblies 4 includes a spoke plate 10 and a spoke plate base, the spoke plate base includes a fixed end 7 and a moving end 8, the moving end 8 is a rectangular plate, wherein the fixed end 7 is connected with a flange at the end of the second front barrel 2 through a screw, and two sides of the moving end 8 are respectively connected with the fixed end 7 and the spoke plate 10; the moving end 8 is provided with two unloading grooves 9, the two unloading grooves 9 are parallel to each other and parallel to the edge of the web plate 10 connected with the moving end 8, and the opening positions of the two unloading grooves 9 are respectively positioned on the opposite edges of the moving end 8; during vibration, the web 10 moves relative to a groove in the relief groove 9 remote from the web 10. The web 10 is tangent to the secondary mirror frame 5, and the tangent point positions are uniformly distributed on the secondary mirror frame 5; the limiting block 6 is arranged on the secondary mirror frame 5 and used for limiting the position of the secondary mirror.
Through simulation analysis and calculation, the component supporting rigidity, the reflector surface shape and the position stability are greatly improved compared with the traditional pure three-rod supporting mode, and the performance requirements of the space optical remote sensing system can be met.
In order to ensure the position stability of the secondary mirror, the invention adopts a radial plate tangential installation mode, and when the radial plate 10 generates thermal stress, the rigid body displacement of the secondary mirror can be reduced through the rotation of the secondary mirror and the secondary mirror frame 5, thereby ensuring the position precision of the secondary mirror. In order to reduce weight, the invar steel material is selected for material selection, the web 10 is of a three-layer sandwich structure and comprises a core plate, a reinforcing plate and skins, the core plate is arranged in the middle layer, the reinforcing plates are arranged on two sides of the core plate, the skins wrap the reinforcing plate and the core plate, the reinforcing plate and the skins are connected through riveting to form the web 10, the core plate in the middle layer is designed in a light weight mode, and damping rubber is injected. In the aspect of a supporting structure, the invention adopts a flexible supporting mode of a three-layer sandwich structure web plate 10 to replace a simple single-rod bracket. The spoke plate base is provided with the unloading groove 9, the flexibility of the unloading groove 9 is improved, the relative movement speed of the spoke plate 10 and the spoke plate base during vibration can be increased, the effect of damping rubber in the spoke plate 10 is enhanced, and meanwhile the rigidity of the supporting structure can be reduced. By carrying out optimization design and finite element simulation analysis on relevant dimensions (parameters such as groove width, groove depth and groove spacing) of the unloading groove 9, the flexibility of the unloading groove 9 is improved, and meanwhile, the structural rigidity is ensured to meet the requirements. Compared with the supporting rod, the flexible radial plate reduces the rigid displacement influence of thermal stress on the secondary mirror, improves the mechanical environment adaptability of the secondary mirror assembly, and simultaneously reduces the amplitude amplification of the secondary mirror under the vibration condition.
Fig. 4 is a sinusoidal response analysis curve in the form of a rigid support with a first order resonance frequency of 100Hz and an amplitude magnification of about 114 times at the resonance frequency.
FIG. 5 is a sinusoidal response analysis plot in the form of a flexible web support having a first order resonant frequency of 107.15Hz at which the amplitude magnification is about 12.2 times. Comparing fig. 4 and fig. 5, it can be known that compared with the rigid support form, the flexible support is characterized in that the relative motion amplitude and speed are increased by using the flexible structure form, and the action effect of the damping rubber is improved, so that the amplitude amplification of the secondary mirror position is kept reduced on the premise of ensuring the fundamental frequency requirement.
The present invention has not been described in detail, partly as is known to the person skilled in the art.
Claims (4)
1. A sectional type secondary mirror high-stability supporting structure is characterized by comprising a first front lens barrel (1), a second front lens barrel (2) and a secondary mirror supporting assembly (3); the secondary mirror support assembly (3) comprises a web assembly (4) and a secondary mirror frame (5); each group of spoke plate components (4) comprises a spoke plate (10) and a spoke plate base; one end of the spoke plate (10) is connected with the spoke plate base, the other end of the spoke plate is connected with the secondary mirror frame (5), and the circular secondary mirror frame (5) is tangent; each spoke plate base is fixedly arranged at one end of a second front lens cone (2) respectively, and the other end of the second front lens cone is connected with a first front lens cone (1);
the spoke plate base comprises a fixed end (7) and a moving end (8); the fixed end (7) is connected with a flange at the end part of the second front lens cone (2); the moving end (8) is a rectangular plate, and two sides of the moving end (8) are respectively connected with the fixed end (7) and the spoke plate (10); the moving end (8) is provided with two unloading grooves (9), and the two unloading grooves (9) are parallel to each other and parallel to the edge of the spoke plate (10) connected with the moving end (8); the opening positions of the two unloading grooves (9) are respectively positioned on two opposite sides of the moving end (8);
the first front lens cone (1) is frustum-shaped, the large end of the first front lens cone is connected with external equipment through an end flange, and the small end of the first front lens cone is connected with the second front lens cone (2);
the second front lens barrel (2) is cylindrical and is fixedly connected with the spoke plate bases through end flanges;
the spoke plate assemblies (4) are provided with three groups, and the tangent point positions of the spoke plate (10) and the secondary mirror frame (5) are uniformly distributed on the secondary mirror frame (5) along the circumferential direction;
the spoke plate (10) is of a three-layer sandwich structure and comprises a core plate, reinforcing plates and skins, wherein the core plate is arranged in the middle layer, the reinforcing plates are arranged on two sides of the core plate, the reinforcing plates and the core plate are wrapped by the skins, and the core plate material in the middle layer is invar steel and is filled with damping rubber;
the width of the unloading groove (9) is 1mm, the depth of the unloading groove is 5mm, and the distance between the unloading grooves is 12 mm.
2. The segmented secondary mirror high stability support structure of claim 1, wherein: the secondary mirror supporting assembly (3) further comprises a limiting block (6) used for limiting the position of the secondary mirror, and the limiting block (6) is installed on the secondary mirror frame (5).
3. The segmented secondary mirror high stability support structure of claim 1, wherein: the first front lens cone (1) or the flange at the end part of the first front lens cone (1) is made of C/SiC composite material.
4. The segmented secondary mirror high stability support structure of claim 1, wherein: the second front lens cone (2) or the end flange of the second front lens cone (2) is made of C/SiC composite material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710371601.7A CN107037566B (en) | 2017-05-24 | 2017-05-24 | High stability bearing structure of sectional type secondary mirror |
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| CN201710371601.7A CN107037566B (en) | 2017-05-24 | 2017-05-24 | High stability bearing structure of sectional type secondary mirror |
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| CN107037566B true CN107037566B (en) | 2020-03-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108152913B (en) * | 2017-12-14 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Lens cone and method for adjusting coaxiality of primary lens and secondary lens |
| CN109031585B (en) * | 2018-08-31 | 2020-11-20 | 北京空间机电研究所 | Reflector supporting and fixing device and flexible support thereof |
| CN109164568B (en) * | 2018-09-29 | 2020-05-15 | 中国科学院长春光学精密机械与物理研究所 | Carbon fiber composite telescope |
| CN109491072A (en) * | 2019-01-04 | 2019-03-19 | 中国科学院长春光学精密机械与物理研究所 | The secondary mirror system support structure and its manufacturing method of large aperture telescope |
| CN112130278B (en) * | 2020-09-28 | 2021-12-24 | 吉林大学 | Secondary mirror supporting structure suitable for high-resolution space camera |
| CN114325906B (en) * | 2021-12-28 | 2023-05-16 | 中国科学院长春光学精密机械与物理研究所 | Integrated secondary mirror assembly and manufacturing method thereof |
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