DOF and kinematics analysis of a 3-UPU parallel mechanism for telescope secondary mirror support

Shuai Wang; Kunyao Zheng; Yi Chen; Mingming Xu; Dazhi Wang

doi:10.1117/12.2605301

24 November 2021 DOF and kinematics analysis of a 3-UPU parallel mechanism for telescope secondary mirror support

Shuai Wang, Kunyao Zheng, Yi Chen, Mingming Xu, Dazhi Wang

Proceedings Volume 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations; 120690C (2021) https://doi.org/10.1117/12.2605301
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

In order to meet the requirements of high-precision positioning and adjustment of the secondary mirror of the telescope, the three-dimensional models of two kinds of 3-UPU parallel mechanisms are established. Firstly, the constraints and degrees of freedom(DOF) of the 3-UPU parallel mechanism platform are compared and analyzed by screw method. The analysis results show that the DOF of the mechanism is related to the spatial position relationship of the kinematic pairs. When the type and number of the kinematic pairs in the mechanism are the same, the DOF is not necessarily the same. Therefore, it is necessary to select the mechanism according to the supporting requirements of the secondary mirror and the motion characteristics of the mechanism. It is concluded that the 3-UPU parallel mechanism with non parallel upper and lower Hooke hinge planes has two rotational DOF and one translational DOF, which can meet the motion requirements of the secondary mirror rotating around and moving along the optical axis, and achieve accurate adjustment and positioning.

Citation Download Citation

Shuai Wang, Kunyao Zheng, Yi Chen, Mingming Xu, and Dazhi Wang "DOF and kinematics analysis of a 3-UPU parallel mechanism for telescope secondary mirror support", Proc. SPIE 12069, AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations, 120690C (24 November 2021); https://doi.org/10.1117/12.2605301

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