Measurement on Camber Deformation of Wings of Free-flying Dragonflies and Beating-flying Dragonflies

Measurement on Camber Deformation of Wings of

Free-flying Dragonflies and Beating-flying

Dragonflies

Deqiang Song;Lijiang Zeng

【期刊名称】《仿生工程学报（英文版）》 【年(卷),期】2004(001)001

【摘要】The knowledge of wing orientation and deformation during flapping flight is necessary for a complete aerodynamic analysis, but to date those kinematic features have not been simultaneously quantified for free-flying insects. A projected comb-fringe (PCF) method has been developed for measuring spanwise camber changes on free-flying dragonflies and on beating-flying dragonflies through the course of a wingbeat, which bases on projecting a fringe pattern over the whole measurement area and then measuring the wing deformation from the distorted fringe pattern. Experimental results demonstrate substantial camber changes both along the wingspan and through the course of a wingbeat. The ratio of camber deformation to chord length for hind wing is up to 0.11 at 75% spanwise with a flapping angle of -0.66 degree for a free-flying dragonfly. 【总页数】5页(41-45)

【关键词】free flight;fringe pattern projection;insect flight;wing orientation;wing camber