Dr. Lin Li Profile

Dr. Lin Li

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Proceedings Article | 19 October 2016 Paper

Research on the flywheel components’ disturbance mechanism of a high resolution optical satellite

Li Lin, Wang Dong, Zhou Sitong, Luyang Tan

Proceedings Volume 10154, 101540H (2016) https://doi.org/10.1117/12.2245668

KEYWORDS: Satellites, Optical resolution

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According to the picture of a sub-meter resolution optical satellite acquired on the orbit, there is a phenomenon of jitter in the process of taking pictures. The flywheel as the main attitude control component of the satellite, the disturbance that it caused has great influence on the high resolution optical satellite in its normal action. This paper has respectively researched the flywheel components’ disturbance mechanism from three parts, including uneven rotator, rotator friction, bearing disturbance, builds the mathematics model of disturbance to analysis the characteristic of disturbance. we get that the vibration system is not a fully linear system, the system is linear before the occurrence of rubbing. It also can be seen that the system has a number of different cross rigidity, it will often appear unstable motion that resulting in damage, or becomes the ultimate destruction due to the role of nonlinear damping. When the rolling roll in the surface, it will produce an alternative excitation force if there exist defects or damage in the rolling surface. This research would offer guidance for system optimization design and vibrating isolation compensation of the later type of improved satellite.

Proceedings Article | 19 October 2016 Paper

Research on the influence of the disturbance characteristics of the flywheel components on a high resolution optical satellite

Lin Li, Sitong Zhou, Lin Kong, Jing Xu, Dong Wang

Proceedings Volume 10154, 101540G (2016) https://doi.org/10.1117/12.2245659

KEYWORDS: Satellites, Optical resolution

Read Abstract +

In order to study the influence of flywheel micro vibration on the imaging of a high resolution optical satellite, the flywheel components disturbance model was established, and the flywheel components were tested. The analysis of the measured data shows that there is a series of harmonic at the first order frequency 50Hz, and a series of peaks around the 190Hz and 280Hz. The integration of the angular displacement response that was obtained by exerting the unit sine excitation on the satellite and the flywheel measured disturbance data shows that there is a lot of angular displacement harmonic response frequency in 40Hz~80Hz and 230Hz~280Hz, the maximum angular displacement resonance response amplitude is 2.739" along the vertical direction, the angular displacement resonance response amplitude is 2.617" at 245Hz and 2600rpm, and 0.5" magnitude harmonic amplitude around 245Hz. Flywheel micro vibration has a great influence on the high resolution optical satellite imaging quality. Suggestions on further research on micro vibration of flywheel are proposed.

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