Effects of uneven stroking on the aerodynamic efficiency of a Dragonfly-inspired wing-actuation system
Date
2015
Authors
Kok, J.M.
Chahl, J.S.
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Conference paper
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AIAC16: 16th Australian International Aerospace Congress, 2015, pp.310-317
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16th Australian International Aerospace Congress (23 Feb 2015 - 24 Feb 2015 : Australia)
Abstract
In this paper, we investigate the effects of using an uneven upstroke to downstroke motion on the aerodynamic efficiency of a dragonfly inspired flapping wing system. Our results show that for a system without elasticity, the highest aerodynamic efficiencies (L/P = 0.185) were observed using near symmetrical upstrokes to downstroke profiles (xi = 0.52), but with an optimized pitching profile (alpham = 8pi/12, alpha0 = 4pi/12). We then modeled the system with elasticity. In systems with low elasticity (lambda < 1.0), the benefits of uneven stroking were minimal with percentage improvements in aerodynamic efficiency with the use of uneven stroking of less than 2%. However, in systems dominated by elastic forces (lambda < 2.0), the improvements in aerodynamic efficiency can be as high as 35%
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Copyright 2015 Engineers Australia