Dr. Changcheng Wu Profile

Dr. Changcheng Wu

at Nanjing Univ of Aeronautics and Astronautics

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Publications (2)

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Proceedings Article | 11 September 2024 Poster + Paper

Development of the hexapod for the secondary mirror of the YNAO 2-m Ring Solar Telescope

Dehua Yang, Changcheng Wu, Qishuai Lu, You Wang, Yichun Dai, Zhenyu Jin

Proceedings Volume 13094, 130944T (2024) https://doi.org/10.1117/12.3021630

KEYWORDS: Mirrors, Design, Actuators, Solar telescopes, 3D modeling, Telescopes

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The 2-m Ring Solar Telescope (RST) of the Yunnan Astronomical Observatory (YAO) is a new-generation solar telescope that will provide high-resolution solar observations. The RST is now under commissioning on the YAO campus. The secondary mirror of the RST is a 0.6-m diameter convex mirror that is supported by a hexapod system which is to provide precise and stable positioning and alignment of the secondary mirror. We present the development of the hexapod system, including its technical requirement, workspace, actuator and joint design. The classic Stewart type configuration is adopted for the hexapod design and the stepmotor-ballscrew concept for the actuator design. The one-part 2D flexure concept is used to manufacture the Hooke’s joints and also used for 3D rotary joint design. We also describe the performance tests of the hexapod system in laboratory. The hexapod is able to cover a sphere of sf7mm. The translational displacement resolution is down to 0.1μm and repeatability <0.1μm RMS, the rotational displacement resolution is down to 0.5 arcsec with repeatability <0.1 arcsec RMS. Besides, the hexapod exhibits high stiffness over 60Hz with a payload of 70kg.

Proceedings Article | 6 July 2018 Paper

A pneumatic axial support prototype of the primary mirror of a 2m solar telescope

Dehua Yang, Changcheng Wu, Fei Fei, Zhenyu Jin, Zhong Liu

Proceedings Volume 10700, 107003U (2018) https://doi.org/10.1117/12.2313411

KEYWORDS: Actuators, Mirrors, Prototyping, 3D modeling, Solar telescopes, Sensors

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A so-called Semi-Active Support (SAS) system was proposed for the primary mirror of the YNAO 2-m Ring Solar Telescope (2-m RST of Yunnan Astronomical Observatory, China), whose primary mirror is distinctively figured in a ring with an outer diameter of 2.02 m and a ring width of 0.35 m. This paper reports the design and tests of the prototype of the pneumatic-based semi-active axial support system of the 2-m RST. The dummy mirror was a solid circular plate glass of 700 mm in diameter and 20 mm in thickness, which was support by nine Pneumatic Force Actuators (PFAs) organized in three groups, each group was regulated by one proportional regulating solenoid valve. Besides, three Displacement Actuators (DAs) were used to actively define the three Degrees Of Freedom (DOFs) of piston and tip/tilt of the dummy mirror. The pneumatic force actuators were to be actively pumped and regulated, meanwhile, the displacement actuators to actively define the primary’s position, according to the variation of the elevation pointing of the telescope. The PFA was build with a metal bellow as its cylinder, and a pressing load cell of 200 N capacity with 5 mN resolution was integrated on its output tip. The DA was a step-motor based design with a travel range of 4 mm and a theoretical resolution of 50 nm. Basic technical requirements for the PFAs and DAs were reviewed first. General consideration and configuration of the prototype was elaborated, followed by detailed designs and comprehensive tests of the either type standalone actuator. The prototype was finally tested on a systematic level as well. This prototype study has paved a reasonable way for critical design of the axial support system of the 2-m RST primary mirror.

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