| Citation: | XU Na, ZHOU Shuaizhi, MOU Xiaoleiet al. Effects of stroke deviation on flight stability of true hoverfly[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(7): 1372-1378. doi: 10.13700/j.bh.1001-5965.2020.0719(in Chinese)
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The aerodynamic performance of insect can be affected by wing stroke deviation, which may also influence the flight stability. The longitudinal and lateral non-dimensional stability derivatives of hoverfly with stroke deviation are obtained by solving Navier-Stokes equation, and then the natural modes of motion analysis method is used to analyze the flight stability. The results show that, when stroke deviation exists, the stability derivative of the rolling moment induced by the side motion velocity decreases significantly, while the other derivatives have little difference by comparing the situation with no stroke deviation. The reason why the existence of stroke deviation causes the decrease of the derivative is that the positive rolling moment of the left and right wings declines obviously under lateral wind circumstance, while the negative rolling moment caused by the lateral force increases slightly, which makes the total negative rolling moment increase. However, the decrease of the derivative of the rolling moment caused by the lateral flow does not alter the flight stability of hoverfly, and the longitudinal and lateral characteristic modes of motion are still the same as those without stroke deviation.
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