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基于修正的Craig-Bampton法的大长径比助推器分离特性研究
Separation Performance of the Boosters with Large Length/Diameter Ratio Based on Improved Craig-Bampton Method
投稿时间:2017-12-26  修订日期:2018-01-24
DOI:
中文关键词:  助推器分离  改进的Craig-Bampton法  柔性多体动力学  分离安全边界  敏感度分析
英文关键词:Boosters Separation  Modal Synthesis Method  Flexible Multi-body Dynamics  Separation Safe Boundary  Sensitivity Analysis
基金项目:
作者单位E-mail
王月 中国运载火箭技术研究院 wangyue04241@126.com 
冯韶伟 北京宇航系统工程研究所 fawwi@126.com 
王建明 北京宇航系统工程研究所  
宋漪萍 北京宇航系统工程研究所  
姜沂 北京宇航系统工程研究所  
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中文摘要:
      在芯级周围布置助推器是有效提升运载能力的手段。对于长径比较高的助推器来说,结构呈现明显的局部弹性效应,从而对助推器分离的安全性产生影响。针对传统Craig-Bampton方法无法适用于大范围运动的弹性体的不足,本文采用修正的Craig-Bampton法获得系统的正则化模态,使研究对象所有模态与频率的一一对应,实现分离体大范围刚体运动与弹性变形的有效耦合。基于该方法开展柔性多体动力学仿真,获得不同模态阶数、结构刚度的弹性助推器分离系统的分离特性。研究结果表明,与传统的刚体模型相比,考虑助推器弹性效应的分离动力学模型更加贴近真实飞行情况。基于此,获得各阶模态和结构刚度对分离安全边界的影响规律,其中以一阶横向频率最为敏感。通过研究弹性助推器的分离特性,为运载火箭助推器分离系统的工程实际应用提供了理论参考和研究支撑。
英文摘要:
      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 security. The Craig-Bampton method couldn't exactly react the flexible body's dynamic response characteristic. In this paper, the improve Craig-Bampton method will be used to get the normal mode, to make the mode corresponding to the frequency, and the rigid body's motion could couple with the elastic deformation. Based on this method, the boosters' separation character by different modal and stiffness will be researched. The results show that the elastic model is much closer to the reality than the rigid one, and get the sensitivity of the separation safe boundary by mode and stiffness, especially the first bend mode. It will provides reference and theoretical support for the design of engineering application.
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