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Hydrodynamic performance of robotic fish propulsor

Yu Kai Huang Sheng Hu Jian Guo Chunyu(School of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China)  
On the basis of the experimental model of catamaran with robotic fish propulsor,numerical model for the tail-fin locomotion in a robotic fish propulsor was established after the forebody swing of single body and single tail robotic fish solved.Tail-fin′s mean thrust performance curve and mean efficiency curve were calculated with panel method when the tail-fin and tail-handle swing with different phase angle,and the correlative curve between swing frequency and amplitude of tail-fin maximum thrust were computed when the tail-fin and tail-handle swing with the same phase angle.From the calculation result if the tail-handle and tail-fin are linked rigidly when designing double-body and double-tail propulsor,at the same time,swing frequency of tailfin swing,the thrust of tail-fin can be enhanced considerably,so the propulsor power of robotic fish can be increased.
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