This paper numerically investigates the self-propelled swimming of a flexible filament driven by coupled pitching and plunging motions at the leading edge. The influences of bending rigidity and some actuation parameters (including the phase offset between pitching and plunging, and the amplitudes of pitching and plunging motions) on the swimming performance are explored. It is found that with increasing rigidity, the swimming style gradually transits from the undulatory mode to the oscillatory mode. The plunging-pitching actuation is found to be superior to the plunging-only actuation, in the sense that it prevents the decrease of speed at high rigidity and achieves a higher efficiency across a wide range of rigidity. The comparison of the body kinematics with those of animal swimmers, and the classification of the wake structures are discussed. The results of this study provide some novel insights for the bio-inspired design of autonomous underwater vehicles.

本文从数值上研究了挠性细丝的自推进游动，该挠性细丝是由前缘的俯仰和插入运动耦合驱动的。探讨了弯曲刚度和一些驱动参数（包括俯仰和俯冲之间的相位偏移以及俯仰和俯冲运动的幅度）对游泳性能的影响。发现随着刚性的增加，游泳风格逐渐从起伏模式转变为振荡模式。发现俯仰俯仰致动优于仅俯仰致动，在某种意义上说，它防止了高刚度下的速度降低，并在较宽的刚度范围内实现了更高的效率。讨论了人体运动学与动物游泳者的身体运动学比较，以及尾流结构的分类。