Study on supporting force sensing and control during large aperture space mirror test

Long Zhang; Wenqi Hu; Liehua Zheng; Peiming Hao

doi:10.1117/12.2242970

28 October 2016 Study on supporting force sensing and control during large aperture space mirror test

Long Zhang, Wenqi Hu, Liehua Zheng, Peiming Hao

Proceedings Volume 9683, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 968320 (2016) https://doi.org/10.1117/12.2242970
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

During the machining of large aperture lightweight space mirror, the mirror figure consistency between ground test and space mission is a problem. In order to effectively control the supporting deformation effect on test results in gravity environment, in view of a 1.2-m space mirror with back blind holes, a supporting method for optical axis horizontal test is proposed, with this method, mirror under test is positioned by three center hole surfaces and supported by six external hole surfaces. The effect of deformation caused by different supporting force value, area and position is analyzed by finite element method, the simulation results show that this supporting method can control the mirror supporting deformation within PV0.035λ rms0.005λ. The actual supporting system uses soft expansion mandrel to control the mirror position and pneumatic lever to realize the floating support. In order to ensure that the support force can evenly distribute on the contact surface, a pressure mapping system is adopted to measure the interface pressure between the mirror blind holes and the soft supporting pads for the first time. This method can meet the test requirements of rms=1/40λ mirror and provides a technical support for high precision test of large aperture space mirror with back blind holes.

Citation Download Citation

Long Zhang, Wenqi Hu, Liehua Zheng, and Peiming Hao "Study on supporting force sensing and control during large aperture space mirror test", Proc. SPIE 9683, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 968320 (28 October 2016); https://doi.org/10.1117/12.2242970

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