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Impact Dynamics of supercavitating projectile with Fluid/Structure Interaction

Journal of Harbin Institute of Technology(New Series) 2013年第1期20卷 101-106页

作者： Qian-Kun He Ying-Jie Wei Cong Wang Jia-Zhong Zhang School of Astronautics Harbin Institute of Technology

As supercavitating projectiles move at high speed, the periodic impacts ("tail-slap") on the interior surface of the cavity generally occur due to disturbances. The interactions between the projectile and the water/cavity interface are the sources of structural vibrations, which affect the guidance of the vehicle and undermine the structural reliability. The Fluid/Structure Interaction calculation procedure of the tail-slaps of supercavitating projectile is established, and the dynamic behaviours of the projectile operating in tail-slap conditions with and without considering Fluid/Structure Interaction are obtained and compared. The responses of the projectile riding a reducing cavity are studied, and the effect of Fluid/Structure Interaction is also analyzed. The results show that the angular velocity of projectile increases as the body slowing down, and the amplitude of the elastic displacement response decreases at the beginning and increases when the cavity size is close to the diameter of the tail of projectile. The effect of Fluid/Structure Interaction reduces the amplitudes and frequencies of the impact loads and the vibration responses of the body, and when the speed is higher, the effect is more apparent.

关键词： supercavitating projectile tail-slap fluid/structure interaction dynamic response finite element method

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超空泡射弹的结构优化与稳定性分析

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哈尔滨工程大学学报（英文版） 2023年第3期22卷 527-544页

作者：王康健伍友利郝双鹏荣光 Aviation Engineering College Air Force Engineering UniversityXian 710038China National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China

Stability is the key issue for kinetic-energy supercavitating *** previous work established a six degrees of freedom(DOF)dynamic model for supercavitating ***,the projectile’s structure did not meet our current design specifications(its sailing distance could reach 100 m at an initial speed of 500 m/s).The emphasis of this study lies in optimizing the projectile’s ***,a program was developed to optimize the projectile’s structure to achieve an optimal design or the largest sailing *** program is a working optimal method based on the genetic algorithm(GA).Additionally,the convergence standard and population producing strategy were improved,which greatly elevated the calculation speed and *** meet design specifications,the improved GA was combined with the 6DOF model,which establishes a dynamic optimization *** new projectile’s structure was obtained by solving this ***,the new structures’dynamic features were compared with the ideals proposed in this *** criterion of stability,which is called weakened self-stability,was redefined based on the *** weakened self-stability is the optimal stability for an actual kinetic projectile motion,and it is instructive for the design of supercavitating projectiles in the future.

关键词： Structural optimization Self-stability tendency supercavitating projectile Dynamic features projectile stability

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