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Numerical Modeling of RadioAstron SRT Temperature Deformations
| Content Provider | Semantic Scholar |
|---|---|
| Author | Arkhipov, M. Y. Vinogradov, I. S. Novikov, S. B. Fedorchuk, S. D. |
| Abstract | 391 One of the main factors that influence the accuracy of space radio telescope's (SRT) reflecting surface in orbit are temperature deformations of the structure. At the same time, the surface accuracy should meet very high requirements [1]. However, the size of the mirror in the working state does not allow one to perform grounddbased thermallvacuum tests while monitoring the full volume of deviations in the reflecting surface. The only way to estimate temperature deformations and deviations in the reflecting surface as a whole at the orbital operation stage is numerical modeling. Calculation Model We used the finiteeelement technique in the MSC.Nastran software implementation as the main computational method. The finiteeelement model includes the models of 27 petals, a central part, a reflector farm, a science payload container, and a trann sition farm. The total number of components in the model is 49821, the number of items is 47247. The model was developed taking into account the possibill ity of using it, not only for deformation analysis, but also for thermal analysis. In addition, for higher relii ability of the results, the temperature fields were calcuu lated by software for domestic development. This has greatly reduced labor consumption and increased the accuracy of the results. The verification of a calculaa tion model and the adequacy of its real structure is a significant problem. The works on verifying calculaa tion models can be subdivided into three directions. The first direction is associated with formal checks of the model, which are standard in the finiteeelement modeling. These checks include the following: (1) the control of initial data, including characterr istics of materials, the cross section, the thickness of components, etc.; (2) the control of integrity of the grid, the absence of degenerated elements and elements with nonoptii mal geometry; (3) the analysis of parasitic thermal stresses and the frequency of natural oscillations of a free structure, the response at applying unitary loads, etc. These checks have accompanied works on modell ing the strain state at all modeling stages because the calculation model has undergone changes in the course of these works. The second type includes the complex of works associated with the analysis of the effect of initial data (characteristics of materials, boundary conditions, design features) on the response (deflections of a reflecting surface) of the calculation model. In fact, this direction of verification comb the whole experience gained in the course … |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.asc.rssi.ru/radioastron/publications/articles/cr_2014,52,391.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Abnormal degeneration Cross section (geometry) Division algorithm Formal verification Gain Molecular orbital Musculoskeletal Diseases Numerical analysis Parasites Requirement Stage Is The Whole Experience Thickness (graph theory) V-Model Verification and validation Verification of Theories Verifying specimen |
| Content Type | Text |
| Resource Type | Article |
