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초록· 키워드

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In order to mimic the flapping motion of Allomyrina Dichotoma of which flapping frequency is typically 30Hz. we present an approach to increase the flapping frequency of a previously developed flapper actuated by Lightweight Piezo-Composite Actuator (LIPCA). To increase the flapping frequency of the flapper. the dynamic characteristics of the LIPCA and parameter study of a four-bar linkage have been studied. In a parametric study, it was found that an appropriate combination of linkage lengths can provide a better moment transmission at a given flapping angle amplification. A new four-bar linkage system was fabricated based on the parametric study and then tested to verify the possibility. The test results showed that the optimal flapping frequency of the modified flapper was measured to be about 17Hz, which is about 88.9% increase compared to that of the previous flapper. The modified flapper could also improve 112.5% in horizontal force. However, the flapping angle and vertical force were reduced about 20% and 8.7% respectively.

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Abstract
1. INTRODUCTION
2. LIPCA AND ITS CHARACTERISTICS
3. ANALYSIS OF THE FOUR-BAR LINKAGE
4. FABRICATION AND TEST
5. CONCLUSIONS AND FUTURE WORKS
ACKNOWLEDGMENTS
REFERENCES

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