| Citation: | LI Y C，LI Q H，ZHANG X S，et al. N-dot control method of turbofan engine based on active switching logic[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（11）：3156-3166 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0022
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In order to enhance the acceleration ability of turbofan engines, the traditional N-dot control structure is improved, and an active switching control strategy based on tracking error is proposed. When the tracking error is significant, the N-dot control loop is engaged; otherwise, the steady-state control loop is engaged. At the same time, a contour-based N-dot control scheduling method is proposed. The acceleration process is optimized by a differential evolution algorithm with the objective of minimizing the error with the maximum rotor speed. The maximum high-pressure rotor acceleration at different altitudes is used as the N-dot control schedule, and the acceleration controller is designed based on the compact form dynamic linearization based model free adaptive control (CFDL-MFAC) method. The acceleration time of the active switching (MFAC) N-dot control is approximately 0.7 seconds shorter at the design point and approximately 1.2 seconds shorter at the off-design point for a medium-thrust military turbofan engine when compared to the PI control N-dot under the conventional Min-Max selection structure.
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