A method for determining the on-orbit pointing accuracy of a three-degree-of-freedom mechanism
A pointing accuracy and degree of freedom technology, which is applied in the field of determination of on-orbit pointing accuracy of three-degree-of-freedom mechanisms, to achieve the effect of solving the lack of precision design, reducing manufacturing costs, and reducing the risk of rework
Active Publication Date: 2021-09-03
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology
[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, and to provide a method for determining the on-orbit pointing accuracy of a three-degree-of-freedom mechanism starting from the processing accuracy of parts, installation accuracy, and on-orbit thermal deformation accuracy
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[0026] Such as figure 1 As shown, the three-degree-of-freedom mechanism consists of three single-degree-of-freedom rotating parts and two connecting rods connecting the parts. The degree of freedom 1 (the first single-degree-of-freedom bending part) rotation angle α1 = 135°, and the degree of freedom 2 (single-degree-of-freedom rotating component) rotation angle α2=180°, degree of freedom 3 (second single-degree-of-freedom bending component) rotation angle α3=165°, connecting rod 1 length l1=3830mm, connecting rod 2 length l2= 3600mm, mechanism pointing accuracy index: the pitch direction is less than 0.1°, and the roll direction is less than 0.1°.
[0027] (1) Determine the characteristics of the error source of the mechanism accuracy and measure the error.
[0028] Processing and assembly error: the deviation between the actual structural parameters of the component and its nominal value due to the manufacturing error, assembly error and installation error of the component....
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The present invention relates to a method for determining the on-orbit pointing accuracy of a three-degree-of-freedom mechanism. Composition B, the steps are as follows: (1) Determine the characteristics of the error source of the mechanism accuracy and measure the error; (2) Calculate the amplification error of the connecting rod; (3) Calculate the pointing accuracy of the mechanism based on the obtained measurement error and the calculated amplification error of the connecting rod. The present invention analyzes and comprehensively calculates the pointing accuracy of the overall mechanism by analyzing the combination mode of the accuracy source and the change rule of the accuracy, thereby finding out the main factors affecting the accuracy of the overall mechanism, and through iterative design, finally meets the demand of the satellite for the pointing accuracy of the mechanism.
Description
technical field [0001] The invention relates to a method for determining the on-orbit pointing accuracy of a three-degree-of-freedom mechanism, which can be popularized and applied in the design process of the on-orbit pointing accuracy of all satellite three-degree-of-freedom mechanisms. Background technique [0002] The motion mechanism is used to realize the predetermined sequence of mechanism movement, extend the load on the satellite such as antenna, solar wing, etc. out of the satellite platform, and keep the relative position of the load and the satellite within the specified accuracy range, which is an important part of realizing the satellite load function . [0003] In recent years, with the rapid development of satellite design and manufacturing technology, the number of on-board equipment has increased dramatically, and the layout of equipment has become increasingly compact, resulting in a narrow payload space. However, the demand for payload functions has incr...
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IPC IPC(8): G01C1/00
CPCG01C1/00
Inventor 夏永泉邱乐德王禹慧杨柳莹孙天逸毕大为印璞
Owner CHINA ACADEMY OF SPACE TECHNOLOGY