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| Study on Micro-vibration of Satellite Induced by Momentum Wheels and On-orbit Simulation Analysis |
| Received:March 06, 2015 Revised:June 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.03.003 |
| KeyWord:micro-vibration momentum wheel satellite |
| Author | Institution |
| YANG Xin-feng |
DFH Satellite Co. Ltd，Beijing ，China |
| BAI Zhao-guang |
DFH Satellite Co. Ltd，Beijing ，China |
| YANG Dong |
DFH Satellite Co. Ltd，Beijing ，China |
| LI Yan-hui |
DFH Satellite Co. Ltd，Beijing ，China |
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| Abstract: |
| Objective To study the micro-vibration transfer characteristics and influencing factors so as to provide means to reduce and control the influence of micro-vibration on the imaging quality of satellite camera. Methods Taking advantage of satellite structure, the micro-vibration environment tests were carried out with different rotating combinations of momentum wheels under the fixed boundary and the suspended boundary conditions. Based on the experimental data, the contributions of the transfer ratios from the wheels to the camera, the differences between fixed boundary and suspended boundary, satellite structure and momentum components on vibration spectrum were analyzed. The satellite finite element model was made to conform to the on-orbit status by modifying the ground model and adding the panel so as to conduct on-orbit micro-vibration simulations. Results The on-board micro-vibration acceleration data were obtained under each working status of the momentum wheels. Based on the obtained acceleration data， the fixed boundary and the suspended boundary conditions were both added with the low frequency vibrations， and the on-board micro-vibration included the coupled vibration besides the rotating frequency of the momentum wheels. The micro-vibration transmissions were all in decay with ratios of 0.03-0.475. The micro-vibration simulation analysis provided the camera micro-vibration angle and the influence. Conclusion The micro-vibration of camera mainly depended on the momentum wheel with the highest disturbance. The transfer of micro-vibration from the vibration source to the camera was mainly affected by the interface damping, secondly by the distance. The proposed vibration reduction method based on this transfer characteristic effectively reduced the micro-vibration amplitude of the camera. The on-orbit micro-vibration simulation analysis showed a 0.1 pixel vibration of the camera caused by coupled low frequency vibration of solar wing. |
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