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| Separation performance of the boosters with large length/diameter ratio based on improved Craig-Bampton method |
| Received:December 26, 2017 Revised:January 24, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20171226001 |
| KeyWord:boosters separation modal synthesis method flexible multi-body dynamics separation safe boundary sensitivity analysis |
| Author | Institution |
| 王月 |
中国运载火箭技术研究院, 北京 |
| 冯韶伟 |
北京宇航系统工程研究所, 北京 |
| 王建明 |
北京宇航系统工程研究所, 北京 |
| 宋漪萍 |
北京宇航系统工程研究所, 北京 |
| 姜沂 |
北京宇航系统工程研究所, 北京 |
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| Abstract: |
| The strap-on launch vehicle is widely adopted in order to increase the launching capability.The boosters with large length/diameter ratio presents obvious flexibility,which will affect the separation safety.The Craig-Bampton method couldn't sufficiently cover the flexible body's dynamic response characteristic.In this paper,the improved Craig-Bampton method will be used to get the normal modes,to match the frequencies,and couple the rigid body motion could couple with the elastic deformation.Based on this method,the boosters' separation characteristics in different number of modes and stiffness are studied.The results show that the elastic model is much closer to the reality than the rigid one.The sensitivity of the safe separation boundary of modes and stiffness is determined,and the first bending mode is found to be most sensitive.This work will provide a reference and theoretical support for the design of engineering application. |
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