This paper discusses different aspects of an active flexible filament propulsion in a liquid medium. The immersed boundary method is used to model a flexible filament immersed in Newtonian fluid at low Reynolds numbers. The flexible filament motion emulates that of a C. elegans. We varied some parameters of the filament motion, such as the interpolation points of the function related to the curvature of the filament and the upstroke and downstroke period, and analyzed the kinematic response in the body displacement and fluid flow. A methodology based on signal analysis is proposed for correct modeling of the movement of these filaments. The swimming velocity and distance are analyzed using wavelet transform, in which the notion of time–frequency localization is made precise. This methodology allows defining which parameters lead to the best efficiency, e.g., greater swim distance for the same number of strokes, making it very valuable for passive control of the filament.

本文讨论了液体介质中主动挠性细丝推进的不同方面。浸入边界方法用于模拟低雷诺数下浸入牛顿流体的柔性细丝。柔韧的细丝运动模仿了秀丽隐杆线虫的运动。我们改变了细丝运动的一些参数，例如与细丝曲率以及上冲程和下冲程周期有关的函数的插值点，并分析了人体位移和流体流动中的运动学响应。提出了一种基于信号分析的方法来对这些细丝的运动进行正确的建模。使用小波变换分析游泳速度和距离，其中精确地定义了时频定位概念。这种方法学允许定义哪些参数导致最佳效率，例如，对于相同数量的笔划，更大的游程距离，使其对于灯丝的被动控制非常有价值。