Precision optimization method and system of six-degree-of-freedom adjustment platform for off-axis aspheric element

Abstract

The invention discloses a method and a system for optimizing the precision of a six-degree-of-freedom adjusting platform for an off-axis aspheric element, and the method comprises the steps: measuring the position posture of the adjusting platform and the position vector of each hinge point of a lower platform of the six-degree-of-freedom adjusting platform in a fixed coordinate system OXYZ through a laser tracker; acquiring the lengths of six supporting legs of the six-degree-of-freedom adjusting platform in cooperation with a grating ruler, and establishing an equation to solve the position vector of each hinge point of the upper platform in a movable coordinate system PX'Y'Z' to calibrate the initial position of each kinematic pair of the six-degree-of-freedom adjusting platform; and defining the distances LP and L theta to screen 26 groups of pose schemes derived from the ideal leg length obtained by inverse solution so as to improve the driving control precision; the operation is simple, the efficiency is high, and the precision is high.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a method and system for optimizing the precision of a six-degree-of-freedom adjustment platform for an off-axis aspheric element. Background technique [0002] Large-aperture aspheric optical components are widely used in major strategic deployments of national security and scientific development. Such as air and sky laser weapons, military reconnaissance and resource survey satellites, air and space satellite trajectory detection and ballistic missile early warning, astronomy and deep space exploration, etc. Due to limited manufacturing capacity, the size of aspheric components currently developed in my country ranges from 300 to 1000 mm, which is difficult to meet the needs of reality and future development. When manufacturing larger-diameter aspheric components, splicing must be used. Traditional manual methods have the disadvantages of low assembly...

AI Technical Summary

Problems solved by technology

According to the design and installation of the six-degree-of-freedom adjustment platform, the position accuracy of the six hinges on the upper platform is difficult to guarantee

The drive of the six-degree-of-freedom adjustment platform relies on the servo system. The servo motor will rotate the corresponding angle after receiving one pulse. Usually, the driving accuracy of the servo motor is 1, and the error of the outrigger length will amplify the translation error of the adjustment platform, resulting in The translational error of the six-degree-of-freedom adjustment platform is far greater than 1, making it difficult to meet the accuracy of the six-degree-of-freedom adjustment platform for splicing off-axis aspheric components

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