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Multidisciplinary Design Optimization of Multi-Stage Launch Vehicle using Flight Phases Decomposition

机译:基于飞行阶段分解的多阶段运载火箭多学科设计优化

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摘要

ptimal design of launch vehicles is a complex multidisciplinary problem. The traditional way to optimize such vehicles is to decompose the problem into the different disciplines and to combine specific solvers and a global optimizer. This paper presents a new MDO method to optimize the configuration of an expendable launch vehicle and describes the application of this method to the design optimization of a small liquid fueled multi-stage launch vehicle. The objective is the payload mass maximization. The proposed bi-level method splits up the original MDO problem into the flight phases and optimizes concurrently the different stages of the launch vehicle. This transversal decomposition allows to reduce the search domain at system-level because the optimization problem at this level is analog to a coordination one. Two formulations of the method are presented and the results are compared to the ones obtained by a standard MDO method.
机译:运载火箭的最终设计是一个复杂的多学科问题。优化此类车辆的传统方法是将问题分解为不同的学科,并结合特定的求解器和全局优化器。本文提出了一种新的MDO方法来优化消耗性运载火箭的配置,并介绍了该方法在小型液体燃料多级运载火箭的设计优化中的应用。目标是有效载荷质量最大化。所提出的双层方法将原始的MDO问题分解为飞行阶段,并同时优化了运载火箭的不同阶段。这种横向分解可以减少系统级别的搜索域,因为此级别的优化问题类似于协调问题。介绍了该方法的两种公式,并将结果与​​通过标准MDO方法获得的结果进行了比较。

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