| Citation: | YU Zhiming, CHEN Renliang, KONG Weihonget al. Analysis method for conversion corridor of quad tilt rotor aircraft[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2106-2113. doi: 10.13700/j.bh.1001-5965.2019.0594(in Chinese)
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For flight's characteristics of morphing and speed change in the conversion mode of Quad Tilt Rotor (QTR) aircraft, a comprehensive method based on flight dynamics model is proposed to calculate the conversion corridor of QTR aircraft. In this method, the boundary of lower speed and upper speed are limited by the lift characteristic of wing, and the upper conversion boundary is limited by the available power of the single rotor. The proposed method was used to determine the conversion corridor of the example QTR aircraft without cyclic pitch control, and to analyze the variation of aerodynamic force of pneumatic components and front and rear rotor power with forward speed under different angles of attack of fuselage. The results show that the QTR aircraft is superior in tilting at small angles of attack of fuselage. The vertical force ratio provided by each pneumatic component would change with the angles of attack of fuselage. The upper speed boundary of the conversion corridor of QTR aircraft is composed of the upper speed boundary of the wing lift characteristic and the limit boundary of single rotor power. The available power limit boundary of single rotor is stricter than the total available power limit boundary.
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