Numerical and Experimental Study of a Hydrodynamic Analysis of the Periodical Fluctuation of Bio-Inspired Banded Fins

Journal of Marine Science and Engineering, Journal Year: 2025, Volume and Issue: 13(3), P. 462 - 462

Published: Feb. 27, 2025

A bio-inspired vehicle with banded fin fluctuation as the propulsion mode is research topic. However, this suffers from low efficiency and requires urgent resolution of other issues. In paper, kinematic model surface numerical calculation for its hydrodynamic performance are established based on long dorsal propelled by MPF (Media and/or Paired Fin propulsion) mode. Through simulation, under typical working conditions explored mechanism analyzed. By using a method controlling variables, such wave number, swing angle, frequency, where only one independent variable changed at time while others remain constant, impact thrust coefficient function obtained periodic variation laws governing studied. Oscillatory generated fin’s motion, it first captures water through ‘scoop’ motion then expels via diagonal ‘push’ producing thrust. Due to limitations in length varying oscillation shapes, effective water-pushing stroke differs, leading variations work creating oscillatory forces. When oscillating fins remains nearly constant when frequency less than or equal 1 Hz. exceeds Hz, decreases increases, rate decrease gradually slows down. The effect leading-edge suction was studied angle attack. results showed that, compared unchamfered configuration, forward chamfer better utilizes vortex energy, reducing input power significantly improving efficiency. Guided both simulations experimental results, we design manufacture prototype an underwater propeller that encompasses shape modeling, mechanical structure design, control design. We conduct real tests verify feasibility reliability terms movement, backward turning ability, among others. Furthermore, analyze how attack optimizing front/rear edge shapes can effectively enhance performance.

Language: Английский

Hydrodynamic Simulation and Experiment of a Self-Adaptive Amphibious Robot Driven by Tracks and Bionic Fins

Biomimetics, Journal Year: 2024, Volume and Issue: 9(10), P. 580 - 580

Published: Sept. 24, 2024

Amphibious robots have broad prospects in the fields of industry, defense, and transportation. To improve propulsion performance reduce operation complexity, a novel bionic amphibious robot, namely AmphiFinbot-II, is presented this paper. The swimming walking components adopt compound drive mechanism, enabling simultaneous control for rotation track wave-like motion undulating fin. robot employs different methods but utilizes same strategy, eliminating need mode switching. structure locomotion principle are introduced. patterns was analyzed via computational fluid dynamics simulation. simulation results verified feasibility mechanism. Physical experiments were conducted both land underwater motion, consistent with regulation. Both linear angular velocity proportional to frequency. robot’s maximum speed steering on 2.26 m/s (2.79 BL/s) 442°/s, respectively, while speeds 0.54 (0.67 84°/s, respectively. research findings indicate that possesses outstanding capabilities simplistic yet unified approach, thereby validating design scheme, offering concept development high-performance self-contained robots.

Language: Английский