水下超空泡航行体非线性动力学建模与仿真

超空泡技术可以大幅提高水下航行速度,根据空泡膨胀独立性原理,研究了空泡的记忆效应及其对空泡形态和航行体尾部滑行力等流体动力的影响,在计算超空泡航行体各部分所受的流体动力的过程中考虑了空化器的定向效应和空泡尾部的上漂变形,还研究了航行过程中尾翼浸水深度变化时尾翼效率的变化规律,从而建立了更加精确的超空泡航行体动力学模型。通过仿真分析了超空泡航行体运动的稳定性,最后设计了非线性控制策略来进行深度跟踪。

NONLINEAR DYNAMIC MODELING AND SIMULATION OF AN UNDERWATER SUPERCAVITATING VEHICLE

Supercavitation can be viewed as a kind of technology that could boost the speed of underwater vehicles. The memory effect and its shape, planning force and other hydrodynamic forces of the cavity are investigated, based on the principle of cavity expansion independence. The cavitator orientation effect and cavity flotation are taken into account in computing the hydrodynamic forces of all parts of the supercavitating vehicle. The efficiency of the fin as the fin immersion depth changes is researched while the vehicle is traveling underwater. Then a more precise nonlinear dynamic model of a supercavitating vehicle is established. The stability of motions is analyzed by simulation. A nonlinear control strategy is designed to track a peculiar depth.