Abstract Stability is an important issue for the application of kinetic energy supercavitating vehicles. Interactions of supercavitating vehicles with their fluid environment are exceptionally complex. Traditionally, the kinetic modeling is established in the longitudinal plane, which is inevitable to lose some important features of 6DOF dynamic system. On the basis of general dynamics theory, a 6DOF dynamic system is established for kinetic supercavitating vehicles. Credibility of this model assesses through experiments and empirical estimation equation. The conception of limit-angle and χ-χlim chart are proposed for analyzing the stability of kinetic supercavity vehicles. The instability mechanism is discussed and the calculation method of velocity stable range is given. These works provide the theoretical basis for the engineering. Besides, the cavity cross and position where the tail-slap occurs is visualized in three-dimensional Cartesian coordinates, which could provide a reference for further research on the ballistic dispersion of supercavitating vehicles. Additionally, the further regular of the angular velocity is found. When the vehicle moves in supercavity the hydrodynamic point of the cavitator would change, which changes the angular velocity.

中文翻译：

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动能超空泡飞行器的动力学特性

摘要 稳定性是动能超空泡飞行器应用的一个重要问题。超空泡飞行器与其流体环境的相互作用异常复杂。传统上，动力学建模建立在纵向平面上，这不可避免地失去了 6DOF 动力学系统的一些重要特征。在通用动力学理论的基础上，建立了动力学超空泡飞行器的六自由度动力学系统。该模型的可信度通过实验和经验估计方程来评估。提出了极限角和χ-χlim图的概念，用于分析动力学超空腔飞行器的稳定性。讨论了失稳机理，给出了速度稳定范围的计算方法。这些工作为工程提供了理论依据。除了，在三维笛卡尔坐标中可视化了发生尾部撞击的空腔交叉和位置，可为进一步研究超空泡飞行器的弹道扩散提供参考。此外，还发现了角速度的进一步规律。当车辆在超空腔中移动时，空化器的流体动力点会发生变化，从而改变角速度。