Kinematic Modeling and Dynamic Analysis of the Long-Based Undulation Fin of Gymnarchus Niloticus
Within median and/or paired fin (MPF) propulsion, many fish routinely use the long-based undulatory fins as the sole means of locomotion. In this paper, the long-based undulatory fin of an Amiiform fish“G. niloticus”was investigated. We brought forward a simplified physical model and a kinematic model to simulate the undulations of the long-based dorsal fin. Further, the equilibrium equations of the undulatory fin were obtained by applying the membrane theory of thin shells in which the geometrical non-linearity of the structure is taken into account. Last, we apply the derived kinematic model and equilibrium equations of the undulatory fin to analyze the thrust and propulsive efficiency varying with the aspect ratio of the fin and the maximum swing amplitude.
KeywordsKinematic Model Underwater Vehicle Autonomous Underwater Vehicle Middle Surface Sole Means
Unable to display preview. Download preview PDF.
- 4.Shen, L., Wang, G.: Research Progress and Analysis of Underwater Biomimetic Propulsor Employing Long-fin Undulations. Journal of National University of Defense Technology 27(4), 96–100 (2005)Google Scholar
- 5.Lighthill, M.J.: Biofluiddynamics of Balistiform and Gymnotiform Locomotion Part 2. The Pressure Distribution Arising in Two-dimensional Irrotational Flow from a General Symmetrical Motion of a Flexible Flat Plate Normal to Itself. Journal of Fluid Mechanics 213, 1–10 (1990)MATHCrossRefMathSciNetGoogle Scholar
- 6.Lighthill, M.J.: Biofluiddynamics of Balistiform and Gymnotiform locomotion Part 3. Momentum enhancement in the presence of a body of elliptic cross-section. Journal of Fluid Mechanics 213, 10–20 (1990)Google Scholar
- 7.Wang, G., Shen, L., Ye, Y., Hu, T.: New Underwater Robot Propelled by Undulations of Long-based Fin. In: International Conference on Mechanical Engineering and Mechanics, Nanjing, China, October 26-28 (2005)Google Scholar
- 9.Wang, G., Shen, L., Hu, T., Li, F.: Examination and Analysis of Undulatory Dorsal Fin Propulsion of Gymnarchus Niloticus. Journal of National University of Defense Technology 28(1), 98–102 (2006)Google Scholar
- 10.Yang, Q., Jiang, Y.: Analysis and design of tensioned cable-membrane structures. Science Press, Beijing (2004)Google Scholar