Large-size and high specific stiffness truss off-axis three-reflection optical system main support structure

Abstract

The present invention relates to a large-size and high specific stiffness truss off-axis three-reflection optical system main support structure which mainly comprises a, front plate, a first A-type truss, a second A-type truss, a third A-type truss, a fourth A-type truss, a fifth, A-type truss, a sixth A-type truss, a seventh A-type truss, and a back plate. The technical point is that the seven groups of A-type trusses are combined to the front plate and the back plate through the mode of a threaded connection. Each of the A-type truss comprises an A-type joint, a truss rod, and an I-type joint. The truss rod and the joint are combined together through the mode of glue connection, the mode of glue connection is a sleeve mode, the joint is outside, and the truss rod is inside. The A-type joint is fixed on the front plate, and the I-type joint is fixed at the back plate. The large-size and high specific stiffness truss off-axis three-reflection optical system main support structure has the advantages of compact structure, easy formation of each structure member, easy assembly of a main support structure and a high specific stiffness and can satisfy the use requirement of a large size off-axis three-reflection optical system. The main support structure can be used in the field of large space sensors, space-based telescopes and the like.

Description

technical field [0001] The invention belongs to the field of space optical remote sensing and relates to a main support structure of a truss type off-axis three-mirror optical system with large size and high specific stiffness. Background technique [0002] The off-axis three-mirror optical system has been widely used in the field of space optical remote sensing due to its advantages of no central obstruction, high transfer function, compact structure, and easy realization of large field of view and high resolution at the same time. At present, the main support structure of the off-axis three-mirror optical system usually adopts an integrally cast thin-walled tube structure, such as figure 1 As shown, the materials are generally cast titanium alloy, invar, boron aluminum alloy and other materials. When the size of the remote sensor is large, the integrally cast thin-walled cylinder structure cannot meet the requirements of use. This structure has the following disadvantage...

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Problems solved by technology

[0003] 1) Lower specific stiffness

Materials such as cast titanium alloy have high density and low elastic modulus, resulting in low specific stiffness of thin-walled cylindrical structural parts, and it is difficult to meet the design requirements at the same time for weight and stiffness

[0004] 2) It is difficult to form

The supporting structure of the thin-walled cylinder is integrally cast, which is generally formed by mold casting. The structure of the off-axis three-reverse space remote sensor is complex. If the thin-walled cylinder structure is used, the design and processing of the mold are relatively difficult, and the thin-walled structural parts are prone to appear. Poor forming, warping deformation, cold shut, cracks and other casting defects, low yield

And limited by the current domestic casting capacity, it is difficult to realize the overall casting of large-sized thin-walled cylindrical structures, so the thin-walled cylindrical support structure cannot meet the requirements of large-sized optical systems

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