Frontiers of Mechanical Engineering
>> 2007,
Volume 2,
Issue 1
doi:
10.1007/s11465-007-0013-y
Research on swimming by undulatory long dorsal fin propulsion
1.College of Mechanical Engineering and Automation, National University of Defense Technology, Changsha 410073, China; 2.Education Department, National University of Defense Technology, Changsha 410073, China
Available online: 2007-03-05
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Abstract
The kinematics of steady forward swimming of is described. The geometric features of the body and locomotive characteristic and parameters of the flexible dorsal fin are discussed. On the basis of observation and experimental data, a simplified kinematic model on locomotion of the undulatory long dorsal fin propulsion is promoted. The hydromechanical performances of the undulatory long dorsal fin propeller of are estimated with the large-amplitude elongated-body theory. The hydromechanical efficiency of the undulatory long dorsal fin system ranged from 81.664% to 86.420% over a speed range of 0.728 0.985 length " s. It is suggested that the undulatory long dorsal fin propulsion is an adaptation to swimming with high hydromechanical efficiency.
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