Two-degree-of-freedom flexible joints in the whiffletree support structure of a large-aperture mirror

Abstract

The invention relates to a two-degree-of-freedom flexible joint in the whiffletree support structure of a large-diameter reflector, including: a flexible joint body and a lower end flange; the flexible joint body includes: an upper end flange, an upper sheet, and an orthogonal sheet transition method Lan, lower sheet; upper sheet and lower sheet are arranged orthogonally. The two-degree-of-freedom flexible joint in the whiffletree support structure of the large-diameter reflector of the present invention is based on the original structure of the two-degree-of-freedom flexible joint, and four sets of stoppers and eight sets of needle roller bearing positioning block assemblies are added to effectively limit the The rotational freedom Rz of the two-degree-of-freedom flexible joint around the axial direction of the flexible joint obtains a true two-degree-of-freedom flexible joint, which makes the engineering design structure completely consistent with its structural principle, and at the same time effectively improves the fundamental frequency of the whiffletree structure.

Description

technical field [0001] The invention belongs to the technical field of space remote sensing, and relates to a two-degree-of-freedom flexible joint in a whiffletree support structure of a large-diameter reflector. Background technique [0002] Space remote sensors are used to conduct general surveys and detailed surveys of earth and space resources, and their applications in fields such as earth observation and space exploration have important scientific and economic significance. The optical components in the remote sensor, especially the large aperture mirror, are the most important components in the entire optical system, and its surface shape accuracy is directly related to the imaging quality of the entire remote sensor. Due to the large size of the mirror surface of the large-aperture mirror, under the action of comprehensive factors such as gravity load, temperature load, and assembly error of the mirror assembly, the mirror surface is often seriously deformed. The th...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this structure is: in order to fully release the two rotational degrees of freedom, namely image 3 R in x and R y degrees of freedom, the upper sheet 4 and the lower sheet 6 must have a certain width and height, which leads to R z The stiffness in this direction of rotation is not large, in fact, the flex joint releases three rotational degrees of freedom instead of the two required by the design

In this way the R in the whiffletree structure at the flexure z The rotation stiffness in this rotation direction is very weak, which will greatly reduce the fundamental frequency of the mirror assembly

The space remote sensor has to experience a rather harsh vibration environment during the transfer and launch process. The fundamental frequency of the mirror assembly is too low, and it is easy to resonate and cause the structure to be destroyed, which leads to the failure of the entire development task.

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