| Citation: | WEI Yang, XU Haojun, XUE Yuan, et al. Influence of ice accretion on leading edge of wings on stability and controllability of large aircraft[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(6): 1088-1095. doi: 10.13700/j.bh.1001-5965.2018.0589(in Chinese)
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Ice accretion on the wings can affect the operational characteristics and flight performance of the aircraft, posing a hazard to flight safety. Based on the experimental data, the typical ice shapes with different icing severity on the leading edge of wings are constructed. The high-precision numerical simulation method is used to obtain the aerodynamic data of the background aircraft due to ice accretion, and the aircraft six-degree-of-freedom nonlinear dynamics model is established. On this basis, an autopilot closed-loop simulation system with three modes, namely, pitch attitude hold mode, roll attitude hold mode and altitude hold mode, is designed. Through the open-loop simulation, the different severity of ice accretion effects on aircraft trimming characteristics, longitudinal long and short period modal and lateral modal are analyzed, and the differences of aircraft dynamic response under different severity of ice accretion are compared. By using the closed-loop simulation, the influence of ice accretion on the autopilot performance under three modes is studied. The simulation results show that the ice accretion has an adverse effect on the stability and controllability of aircraft, including trimming characteristics, modal characteristics and open-loop dynamic response characteristics of aircraft, and threatens the flight safety.
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