| Citation: | YANG Yang, YANG Chao, WU Zhigang, et al. Design of gust alleviation active control law considering time-delay of servo actuator[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(12): 2236-2244. doi: 10.13700/j.bh.1001-5965.2019.0635(in Chinese)
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For the aersevoelastic model including servo actuators with time-delay segment, the design method of gust alleviation control system is proposed based on Padé approximation and Linear Quadratic Gaussian (LQG) control method. Padé approximation was used to linearize the time-delay segment to a high-order transfer function, and then this function was introduced to an aeroelastic model to establish a linear controlled model of gust alleviation. The LQG method was applied to design a gust alleviation control system based on the linear model, and the order of control system was reduced by the balance truncation method. By using Simulink, the designed control system was introduced to the nonlinear model to calculate the gust responses of open/closed systems under von Karman continuous gust model. The results showed that the gust alleviation control system based on the proposed method could effectively reduce the gust responses of the original model with time-delay. The overloads of the airplane were reduced by around 15% and the root bend moment was reduced by more than 25%.
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