Method for automatic optimized design of axial and side supporting of primary mirror of large-visual-field astronomical telescope
An astronomical telescope, automatic optimization technology
Active Publication Date: 2014-02-26
ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
View PDF2 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] At present, researchers have the following problems in the numerical calculation of the telescope's primary mirror: 1) The use of hyperstatically indeterminate supports forms an over-constrained
2) The optimized position of the support point is not very practical and has no regularity and regularity
Since the grid is mostly divided freely, the position of the nodes is irregular, and the position of the optimized support point (must fall on the node) is also irregular, and the operability is not strong in the process of physical support
3) The node information of the reflective surface of the primary mirror is not extracted for secondary development, and the root mean square error displayed is relative to the root mean square error of the mirror surface deformation in the original coordinate system
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0057] Embodiment 1, the automatic optimal design method for the axial and side support of the primary mirror of a large-field astronomical telescope.
[0058] The finite element software chooses ANSYS, and the computer language is replaced by MATLAB. The specific implementation process is illustrated by taking the optimization process of the 2.5m astronomical telescope support as an example. Such as figure 1 Shown, select φ 1 =1000mm,φ 2 =2500mm, h=120mm, f=2.1316, D=φ 2 , connect the endpoints of the two parabolas to form a quadrilateral. The quadrilateral rotates 360 degrees around the y-axis to form a three-dimensional image of the main mirror of the 2.5m astronomical telescope.
[0059] The axial support adopts the statically definite support of 54 points of the three rings (the vertices of the regular dodecagon in the inner ring + the vertices of the regular octagon in the middle ring + the vertices of the regular 24-gon in the outer ring), such as Figure 5 As show...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for automatic optimized design of axial and side supporting of a primary mirror of a large-visual-field astronomical telescope. The method is based on a large-scale limited software platform and comprises the steps of (1) building a model in a parameterized way; (2) meshing in a parameterized way; (3) applying loads in a parameterized way; (4) performing initial solving; (5) setting an optimized solution target; (6) automatically performing the steps (1)-(4) circularly for multiple times; (7) extracting every cycle computation, and carrying out the following steps based on a universal computer oriented language; (8) performing secondary development to realize fitting of reflection surface data, and then carrying out the step (9) and the step (10) respectively; (9) providing root-mean-square errors (RMSERROR); (10) providing a reflecting mirror plane deformation cloud chart. By adopting the method disclosed by the invention, the problem about design optimization of a supporting scheme of the primary mirror of the large-visual-field telescope is solved, the mirror plane deformation RMSERROR of the primary mirror is less than 10nm under the condition of axial supporting, and the mirror plane deformation RMSERROR of the primary mirror is less than 30nm under the condition that the side supporting zenith distance is 60 degrees. The invention provides a simple optimized design technology for the supporting of the primary mirror of the large-visual-field astronomical telescope.
Description
technical field [0001] The invention relates to a method and technology for automatically optimizing the axial support and side support of the primary mirror of an astronomical telescope based on finite element software and computer language parameterized programming, belonging to the field of astronomical instrument research. Background technique [0002] Building a new generation of astronomical telescopes and improving the ability of large-scale sky surveys is one of the main trends in the development of ground optical equipment. Optical astronomical telescopes have high requirements on the reflective surface of the primary mirror. It has always been a cumbersome problem to optimize the root-mean-square error of the deformation of the primary mirror with axial support and side support under gravity to the order of nanometers. There are three ways to solve the support optimization problem of the main mirror of the astronomical telescope: one is the analytical method, that ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨戟王海仁程景全娄铮郑宪忠钱元
Owner ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI