## Abstract

An outdoor flapping wing micro air vehicle (FWMAV) should be able to withstand unpredictable perturbations in the flight condition. The responses of the time-averaged thrust coefficient and the propulsive efficiency with respect to a stochastic flight velocity deviation were numerically investigated. The deviation was assumed to obey the Gauss distribution with a mean value of zero and a specified standard deviation. The probability distributions of the flapping performances were quantified by the non-intrusive polynomial chaos method. It was observed that both of the time-averaged thrust coefficient and the propulsive efficiency obeyed Gauss-like but not the exact Gauss distribution. The velocity deviation had a large effect on the time-averaged thrust coefficient and a small effect on the propulsive efficiency.

Original language | English |
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Pages (from-to) | 324-330 |

Number of pages | 7 |

Journal | Journal of Beijing Institute of Technology (English Edition) |

Volume | 20 |

Issue number | 3 |

Publication status | Published - Sept 2011 |

## Keywords

- Computational fluid dynamics
- Flapping airfoil
- Non-intrusive polynomial chaos
- Sampling method
- Uncertainty