Ms. Huan Wang Profile

Huan Wang

at Xi'an Institute of Optics and Precision Mechanics CAS

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Proceedings Article | 18 December 2019 Paper

Micro-vibration test and imaging analysis during space camera thermal-optical test

Wenji She, Kai Cui, Xiong Gao, Shuxiu Li, Huan Wang, Wei Yang

Proceedings Volume 11341, 1134114 (2019) https://doi.org/10.1117/12.2543762

KEYWORDS: Cameras, Modulation transfer functions, Mirrors, Magnesium, Analytical research, Collimators, Space operations, Thermography, Motion analysis

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The high resolution space optical camera imaging quality was sensitive to micro-vibration both in space and on the ground test. When performing the thermal-optical test within a vacuum tank, the affiliated air compressor pump, the turbo molecular pump and other pump assembles may cause micro-vibration transmitting to the payload. Firstly, the threshold and frequency bandwidth of the camera mounting flange micro-vibration were calculated based on the cameral optics and structure rigid-body theory. Secondly, three linear accelerometers were used for micro-vibration signals acquiring, and the identification plate was used for imaging. The signals and photos were acquired at the same time during the pumps turned on and turned off separately. Finally, the vibration caused by the pump assembles were analyzed after the thermal-optical experiment process, together with the images’ MTF. It’s shown that even the vacuum tank was isolated on the ground, the affiliated s’ micro-vibration ed to the inside payload, causing a previous vibration The STD of Z axis micro-vibration signal more than 3 times from 2.1mg to 9.5mg, Exceeding the analysised threshold from 9Hz to 16Hz and near the 146Hz, the peak vealue was about 3 times of the threshold at 13 Hz, while the MTF declined little, just about 2.5%.

Proceedings Article | 10 May 2019 Paper

Micro-vibration test of a reaction wheel after the mechanical test and transferring property through a shafting

Kai Cui, Wenji She, Xiong Gao, Zhiguo Li, Zhiqi Zheng, Huan Wang

Proceedings Volume 11068, 110680G (2019) https://doi.org/10.1117/12.2523186

KEYWORDS: Satellites, Sensors, Gyroscopes

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The spacecraft micro-vibration restricts the smoothness of satellite-born pointing assembles, especially for space-based laser communication, it may cause more capacity loss. A precision shafting is often the key component, connecting the satellite and the optical antenna, and transferring micro-vibration from the satellite bus to the above payload. The oscillation characteristics of the Reaction Wheel(RW) subjected to mechanical tests was implemented via pairs of liner accelerometers and acquisition system, then the micro-vibration transfer property through shafting were studied. The results showed that the RW vibration standard deviation (STD) magnified about 5 times to 30mg~50mg in time domain after the mechanical test, the FFT analysis in frequency domain showed the vibration response frequency was spurious, but the main frequency of about 430Hz and 860Hz which matched the frequency multiplication of the frequency the RW bearing balls passing the point defects in the bearing inner part. The liner acceleration and angular velocity was almost direct ratio to the RW speed, and the RW tangential vibration seemed to be more sensitive to the speed. The space used precision shafting showed perfect attenuation for a high frequency angular vibration transferring, the attenuation ratio was about 70%.

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