采用双向流固耦合的柔性胸鳍水动力学分析OA

In order to explore the hydrodynamic performance of flexible pectoral fins in biomimetic robotic fish during swimming,the pectoral fin of angelfish(the family cichlidae and order perciformes)was chosen as the biomimetic model.IPMC(Ionic polymer metal composite)was employed as the fin material.Using the bidirectional fluid-structure coupling simulation method,we first analyze the effects of different aspect ratio parameters on the hydrodynamic performance;subsequently,we investigate the effects of different swing amplitudes and frequencies.Results indicated that a moderate increase in aspect ratio led to a slight decrease in hydrodynamic performance but significantly saved IPMC material usage.Additionally,increasing swing amplitude and frequency proved advantageous in enhancing the hydrodynamic performance of the pectoral fin.With a rear edge length of 9.24 mm and an aspect ratio of 4.77,driven by a 4 V,0.6 Hz signal,the biomimetic pectoral fin achieved optimal comprehensive propulsion performance.This research work establishes a foundational basis for the design and control of biomimetic actuators.