SELF-EXCITED VIBRATION MODEL OF DRAGONFLY’S WING BASED ON THE CONCEPT OF BIONIC DESIGN FOR SMALL- OR MICRO-SIZED ACTUATORS

摘要

This paper describes a self-excited vibration model ofrndragonfly's wing based on the concept of bionic design, which isrnexpected as a technological hint to solve the scale effectrnproblems in developing the small- or micro-sized actuators.rnFrom a morphological consideration of flight muscle ofrndragonfly, the nonlinear equation of motion for the wingrnconsidering the air drag force due to flapping of wing isrnformulated. In the model, the dry friction-type and Van der Poltyperndriving forces are employed to power the flight muscles andrnto generate the stable self-excited wing vibration. Two typicalrnJapanese dragonflies, “Anotogaster sieboldii Selys” andrn“Sympetrum frequens Selys”, are selected as examples, and thernself-excited vibration analyses for these dragonfly's wings arerndemonstrated. The linearized solutions for the nonlinearrnequation of motion are compared with the nonlinear solutions,rnand the vibration system parameters to generate the stable limitrncycle of self-excited wing vibration are determined.