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首页> 外文期刊>The Aeronautical Journal >Integrated one-dimensional dynamic analysis methodology for space launch vehicles reflecting liquid components
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Integrated one-dimensional dynamic analysis methodology for space launch vehicles reflecting liquid components

机译：用于反映液体成分的空间运载火箭的综合一维动态分析方法

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In this paper, structural modelling and dynamic analysis methods reflecting the characteristics of a liquid propellant were developed for a pogo analysis. The pogo phenomenon results from the complex interaction between the vehicle structural vibration in the longitudinal direction and the propulsion system. Thus, for an accurate vibration analysis of a liquid propellant launch vehicle, both the consumption of the liquid propellant and the change in the stiffness reflecting the nonlinear hydroelastic effect were simultaneously considered. A complete vehicle structure, including the liquid propellant tanks, was analytically modelled while focusing on pogo. In addition, a feasible liquid propellant tank modelling method was established to obtain an one-dimensional complete vehicle model. With these methods, comparative studies of the hydroelastic effect were conducted. Evaluations of the dynamic analysis of a reference vehicle were also conducted during the first burning stage. The numerical results obtained with the present orthotropic model and the dynamic analysis method were found to be in good agreement with the natural vibration characteristics according to previous analyses and experiments. Additionally, the reference vehicle showed the estimated occurrence of pogo in the first structural mode when compared with the frequencies of the propellant feeding system. In conclusion, the present structural modelling and modal analysis procedures can be effectively used to analyse dynamic characteristics of liquid propellant launch vehicles. These techniques are also capable of identifying the occurrence of pogo and providing design criteria related to pogo instability.
机译：在本文中，开发了反映液体推进剂特性的结构建模和动态分析方法，用于pogo分析。鸣叫现象是由于车辆结构在纵向方向上的振动与推进系统之间的复杂相互作用而引起的。因此，为了对液体推进剂运载火箭进行精确的振动分析，要同时考虑液体推进剂的消耗和反映非线性水弹性效应的刚度变化。在重点研究Pogo的同时，对包括液体推进剂罐在内的完整车辆结构进行了建模分析。此外，建立了可行的液体推进剂罐建模方法，以获得一维完整的车辆模型。用这些方法进行了水弹性效应的比较研究。在第一个燃烧阶段还对参考车辆的动力分析进行了评估。根据以往的分析和实验，通过本正交异性模型和动力学分析方法获得的数值结果与自然振动特性非常吻合。另外，当与推进剂进料系统的频率进行比较时，参考飞行器显示出在第一结构模式下估计的pogo发生。总之，目前的结构建模和模态分析程序可以有效地用于分析液体推进剂运载火箭的动力特性。这些技术还能够识别pogo的发生并提供与pogo不稳定性相关的设计标准。

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