Abstract
In this paper, we have introduced a flapping wing mechanism actuated by a unimorphpiezoceramic actuator, LIPCA (lightweight piezo-composite actuator). In theflapping system, the limited actuation displacement produced by bending motion ofthe simply supported actuator was transformed into a large flapping angle byusing a four-bar linkage system. A wing rotation mechanism was also designed andimplemented such that the wing can be passively rotated due to the resultantaerodynamic force during flapping motion. The natural flapping frequency of the devicewas about 9 Hz, where the maximum flapping angle was achieved. Flapping testsunder 4–15 Hz flapping frequencies were performed to investigate the flappingperformance by measuring the vertical force and forward force produced. The maximumforces were produced when the flapping device was actuated near the naturalflapping frequency. The measured force data indicated that the present flappingsystem could produce positive average forces in the vertical and forward directions.
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