SPACE TELESCOPE SUPPORTING GIRDER Russian patent published in 2013 - IPC G02B23/16 B64G1/22 

FIELD: physics.

SUBSTANCE: invention relates to space telescopes and can be used for various girder and chassis structures with high requirements for geometric stability of dimensions under the effect of temperature. The space telescope supporting girder consists of longitudinal, transverse and diagonal cylindrical bars whose dimensions are stable under the effect of temperature and are joined with each other in intersection nodes. The longitudinal, transverse and diagonal bars are composite and are joined to each other by a toral basket shell on the larger axis. The toral basket shell is filled with thermometric fluid, wherein geometric dimensions of each of the composite cylindrical bars, the toral basket shell, characteristics of the used material and physical properties of the thermometer fluid are linked by the relationship: $$L=\eta \frac{\mathrm{4,26}\cdot b(\beta -3{\alpha }_1)(\mathrm{0,06}{a}^4+R_1^2\cdot {\delta }_1^2)}{{\alpha }_2(1-{\mu }^2)R_1^2\cdot {\delta }_1^2},$$ where L is the total length of any of the composite bars; b, a denote the small and large semiaxis of the section of the toral basket shell; R₁ is the radius of the middle surface of the toral basket shell; δ₁ is the thickness of the toral basket shell; α₁, α₂ are coefficients of linear expansion of the material of the toral basket shell and the bars, respectively; β is the coefficient of volume expansion of the thermometer fluid; µ is the Poisson ratio of the material of the toral basket shell; η is a coefficient which indicates elasticity of the toral shell at points of connection thereof with the cylindrical bars.

EFFECT: eliminating said shortcomings, ie reducing weight, simplifying the technology of manufacture, reducing the cost of manufacture while providing stability of longitudinal and transverse linear dimensions of the space telescope supporting girder in a non-uniform temperature field without increasing defocusing of the space telescope.

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