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中文摘要：
以捆绑式运载火箭为对象,开展了先局部、后整体的两步模型降阶研究,其中局部降阶法采用模态综合技术,整体降阶法采用模态价值分析方法,最后通过数值仿真验证了本文所提出的两步降阶方法的有效性。
英文摘要：
In this paper,a two-step model reduction method is proposed for a strap-on rocket.In this method,the first step of reduction work is done for flexible components using the modal synthesis method,then the second step of work is done for the overall system using the modal cost analysis method.And finally the effectiveness of the proposed reduction method is verified by the numerical simulations in the end of this paper.
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