CN112818570B - Surface shape calculation method of optical mirror surface - Google Patents
Surface shape calculation method of optical mirror surface Download PDFInfo
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- CN112818570B CN112818570B CN201911118824.8A CN201911118824A CN112818570B CN 112818570 B CN112818570 B CN 112818570B CN 201911118824 A CN201911118824 A CN 201911118824A CN 112818570 B CN112818570 B CN 112818570B
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Abstract
The invention discloses a surface shape calculation method of an optical mirror surface, which comprises the following steps: s1, establishing a three-dimensional model of an optical lens group through three-dimensional modeling software; s2, preprocessing and finite element simulation calculation are carried out on the three-dimensional model through a finite element simulation module in three-dimensional modeling software, surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition are obtained, and the surface shape node coordinates and the surface shape node displacement values are exported into a plurality of independent calculation result files; s3, modifying the formats of the plurality of calculation result files into formats meeting the surface shape calculation requirements; s4, fitting and calculating the mirror surface shapes in the calculation result files with the modified formats to obtain a plurality of surface shape results; and S5, sorting the surface shape results and outputting a result file. The invention can realize the automation of mirror design, improve the working efficiency of single simulation calculation and result subsequent processing, reduce the energy and time consumption of designers in low-efficiency work, and reduce the errors caused by repeated complex operation in work.
Description
Technical Field
The invention relates to the technical field of optical mirror surface design, in particular to a surface shape calculation method of an optical mirror surface.
Background
Space cameras are one means by which people gather data. With the increasing demand for weather, resources, environment, military reconnaissance and astronomical observations, the design requirements for space cameras are also increasing. Space cameras consist of multiple systems, of which the optical system is the most important component of a space camera. The optical system is composed of a plurality of reflecting mirrors, a projection mirror and a related supporting structure. Due to the special working environment of the space camera, the change of gravity from the ground to the space and the change of temperature in the system can generate great influence on the surface shape of the mirror surface. Therefore, in the design process, the surface shape change of the mirror and the related supporting structure under the conditions of gravity or temperature change needs to be considered and calculated carefully.
By means of development of computer science and technology and popularization of finite element calculation principles, finite element simulation software of a structure is increased, traditional finite element analysis and calculation software such as ANSYS, ABAQUS, panran/Nastran and the like are used for expanding the finite element simulation field of the software, and meanwhile, a plurality of emerging finite element analysis and calculation software such as three-dimensional modeling software UG, solidworks and the like are added with finite element simulation modules. The calculation results of the finite element software are accurate and reliable for relatively simple static structural analysis and structural analysis of adding thermal stress. Therefore, at present, a considerable part of related designers directly use a finite element analysis module in the UG software to perform finite element simulation calculation of the structure after three-dimensional modeling is performed by the UG software. And then, deriving a finite element simulation calculation result. And the exported result file is an xlsx file, then the file content is manually copied, pasted and modified, finally the file format meeting the requirement of the surface shape calculation software is completed, and then the surface shape calculation software is imported for surface shape fitting.
In the design stage, the strict optical precision requirement makes the whole design process need to perform multiple calculations and iterative optimization. In the actual design process, the problem of mirror surface deformation along the optical axis, the vertical optical axis and under various combined load working conditions of normal temperature, temperature rise and temperature drop needs to be considered, the manual operation is complex and many times, research and development personnel are very easy to fatigue, the consumed time is long, and mistakes are easy to occur.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a novel optical mirror surface shape calculation method for solving the problems of high error probability, long time consumption and low efficiency caused by manual repeated operation in the traditional mirror surface shape design method.
The invention provides a surface shape calculation method of an optical mirror surface, which comprises the following steps:
s1, establishing a three-dimensional model of an optical lens group through three-dimensional modeling software;
s2, preprocessing and finite element simulation calculation are carried out on the three-dimensional model through a finite element simulation module in three-dimensional modeling software, surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition are obtained, and the surface shape node coordinates and the surface shape node displacement values are exported to be a plurality of independent calculation result files;
s3, modifying the formats of the plurality of calculation result files into formats meeting the surface shape calculation requirements;
s4, fitting and calculating the mirror surface shapes in the calculation result files with the modified formats to obtain a plurality of surface shape results;
and S5, sorting the surface shape results and outputting a result file.
Preferably, the three-dimensional model is preprocessed, and the method comprises the following steps: giving material properties, dividing finite element meshes and adding load working conditions.
Preferably, finite element simulation calculation is carried out on the three-dimensional model, and the calculation of the gravity and temperature values under various load working conditions is included.
The invention can obtain the following technical effects:
under the condition that original software is not modified and influenced, a plurality of calculation result files derived by three-dimensional modeling software are read and output as files meeting the format requirements of surface shape calculation software, surface shape fitting software is automatically called to complete calculation of a plurality of load step surface shapes, and then result sorting software is called to sort and output the surface shape results into one file, so that automation of mirror design work is realized, the work efficiency of single design simulation calculation and result subsequent processing is improved, the energy and time consumption of designers in low-efficiency work is reduced, and errors caused by repeated complex operation in work are reduced.
Drawings
Fig. 1 is a flowchart illustrating a method for calculating a surface shape of a mirror surface of an optical mirror according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
Aiming at the problems that a result file exported after finite element simulation calculation of UG three-dimensional modeling software is a file with a suffix name of xlsx, does not conform to a file format required by surface shape calculation software and needs to be copied, pasted and modified manually, the surface shape calculation method of the mirror surface of the optical mirror provided by the invention has the advantages that a plurality of result files exported by the UG three-dimensional modeling software are read and output to be files meeting the format requirement of the surface shape calculation software, the steps of manually copying, pasting and modifying the result files can be replaced, the energy and time consumption of designers in low-efficiency work is avoided, and the errors caused by repeated complex operation in work are reduced.
Referring to fig. 1, an embodiment of the present invention provides a method for calculating a surface shape of a mirror surface of an optical mirror, including the following steps:
step 1, establishing a three-dimensional model of the optical lens group through three-dimensional modeling software.
The three-dimensional modeling software refers to UG three-dimensional modeling software, and if the three-dimensional model of the optical lens group is established by Solidworks and other three-dimensional modeling software, the format of the exported result file is the format corresponding to the three-dimensional modeling software after finite element simulation calculation. In the following, UG three-dimensional modeling software is taken as an example for explanation, and other three-dimensional modeling software can be obtained in the same manner.
And 2, preprocessing and finite element simulation calculation are carried out on the three-dimensional model through a finite element simulation module in the three-dimensional modeling software, surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition are obtained, and the surface shape node coordinates and the surface shape node displacement values are exported to be a plurality of independent calculation result files.
Because UG three-dimensional modeling software is provided with a finite element simulation module, external finite element analysis software is not required to be called, an internal finite element simulation module can be directly called to carry out pretreatment and finite element simulation calculation on the three-dimensional model of the optical lens group, surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition are obtained, the surface shape node coordinates and the surface shape node displacement values of the mirror surface under each load working condition are exported to be a calculation result file in an excel format, and the suffix name of the calculation result file is xlsx.
And calling a finite element simulation module to carry out pretreatment on the three-dimensional model, wherein the pretreatment can comprise the treatment steps of giving material properties, dividing finite element grids, adding load working condition conditions and the like.
After the three-dimensional model is preprocessed, finite element simulation calculation needs to be carried out on the three-dimensional model. For example: the method comprises the steps of calculating gravity and temperature values under various load working conditions to obtain surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition.
And 3, modifying the formats of the plurality of calculation result files into formats meeting the surface shape calculation requirements.
Because the calculation result file is in an excel format, the calculation result file needs to be modified and converted into a format which meets the surface shape calculation requirement.
In order to avoid manually copying, pasting and modifying the calculation result file, the format of the calculation result file is modified by calling format modification software. For example: programming is carried out based on MATLAB, UG one-key processed exe running files are formed, the exe running files are called, the excel xlsx files are read one by one, surface shape node coordinates and surface shape node displacement values of the mirror surface are output respectively after each file is read, and the output format is consistent with the file content format required by automatic surface shape calculation.
In actual operation, after UG three-dimensional modeling software exports a calculation result file, the operation can be automatically carried out only by starting the exe operation file through double-click, and designers can complete subsequent low-efficiency operation without intervention, so that the burden of the low-efficiency operation on the designers is reduced.
Due to the particularity of different projects, the working conditions and the number of required calculations are different. The adaptation of the working condition number can be automatically completed according to the input file parameters in the one-key calculation process of the exe running file.
And 4, performing fitting calculation on the mirror surface shapes in the calculation result files with the modified formats to obtain a plurality of surface shape results.
The invention automatically processes the simulation result file under each load working condition one by calling an external program.
For example: and calling surface shape fitting software to automatically perform fitting calculation on the surface shape of the mirror surface under the corresponding load working condition in each simulation result file, and finally obtaining a plurality of surface shape results, wherein each surface shape result corresponds to one load working condition of the mirror surface.
And 5, sorting the surface shape results and outputting a result file.
The invention automatically arranges the surface shape result obtained by multiple fitting in a mode of calling an external program. For example: and calling result sorting software to automatically sort the plurality of surface shape results and output the surface shape results into a result file, wherein the result file stores the plurality of mirror surfaces under the load working conditions.
The traditional method can only store the mirror surface of each load working condition independently, namely one load working condition of one mirror surface is stored as one surface shape result, which can occupy a large amount of hardware resources of a computer.
Under the condition of not modifying and influencing original software, the invention completes the calculation of a plurality of load working conditions of a three-dimensional model by calling a secondary development file, outputs the displacement value of a surface shape node of each load step, automatically completes the calculation of a plurality of load step surface shapes by calling surface shape fitting software, and finally calls result sorting software to sort the surface shape results into a file for outputting, thereby realizing the automation of mirror surface design work, improving the work efficiency of single design simulation calculation and result subsequent processing, reducing the energy and time consumption of designers in low-efficiency work, and reducing errors caused by repeated complex operation in work.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (3)
1. A surface shape calculation method of an optical mirror surface comprises the following steps:
s1, establishing a three-dimensional model of an optical lens group through three-dimensional modeling software;
s2, preprocessing and finite element simulation calculation are carried out on the three-dimensional model through a finite element simulation module in the three-dimensional modeling software, surface shape node coordinates and surface shape node displacement values of the mirror surface under each load working condition are obtained, and the surface shape node coordinates and the surface shape node displacement values are exported to be a plurality of independent calculation result files;
it is characterized by also comprising the following steps:
s3, modifying the formats of the plurality of calculation result files into formats meeting the surface shape calculation requirements;
s4, fitting calculation is carried out on the mirror surface shapes in the calculation result files after the formats are modified, and a plurality of surface shape results are obtained;
and S5, sorting the surface shape results and outputting a result file.
2. The method for calculating the surface shape of an optical mirror surface according to claim 1, wherein the preprocessing of the three-dimensional model includes the steps of:
giving material properties, dividing finite element meshes and adding load working conditions.
3. The method for calculating the surface shape of an optical mirror surface according to claim 1, wherein the three-dimensional model is subjected to finite element simulation calculation including calculation of values of gravity and temperature under various load conditions.
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