| Citation: | WANG Zixu, LI Pan, WANG Bing, et al. Variation of tilt-rotor aircraft motion stability and its influence mechanism[J]. Journal of Aerospace Power, 2025, 40（11）：20230755 doi: 10.13224/j.cnki.jasp.20230755
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To elucidate the variation of stability during transition flight, the XV-15 model was taken as the research object. A comprehensive analysis was conducted to understand how factors such as nacelle angle, flight speed, and rotor/wing aerodynamic interactions, influenced the eigenvalues and eigenvectors of motion modes, and stability derivatives, along with their underlying mechanisms. The findings revealed that nacelle angle primarily influenced the eigenvalues of main motion modes and the eigenvectors of Dutch roll and phugoid modes. The underlying key factors included the body’s angular velocity projection onto the rotor axis, the angle between the rotor disc and flight velocity, and the distance from the rotor hub center to the center of gravity, which changed sine or cosine with the nacelle angle. During low-speed flight, the aerodynamic interference between the rotor and wing exacerbated the instability of phugoid mode. The instability was alleviated as the nacelle angle decreased and the flight speed increased. To facilitate the selection of transition paths for tiltable mechanisms, a comprehensive evaluation metric for assessing motion stability within tilting corridors was introduced. This metric in contour mapping visually represented the aggregate trends in motion stability, offering an intuitive understanding of its variations.
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