航空发动机两种加速控制计划的融合控制方法研究

转速导数(N-dot)和换算燃油流量加速控制计划是航空发动机加速过程安全、快速的重要保障,但各自分别易受到功率提取、性能衰退和传感器、燃油计量装置误差的影响导致失速喘振或加速性的下降。为了提高所控制加速过程的鲁棒性,使用这两种控制计划所获燃油流量的偏差大小对N-dot控制计划的控制目标进行调节修正的融合控制方法获得实际的加速燃油流量。以双转子加力涡扇发动机为对象的仿真验证表明,该控制方法可以适应全包线加速控制的需要；相比其余两种控制计划在受功率提取、误差影响下保持正常工作的范围更广；相同工作条件下,该方法比N-dot控制计划更不易发生喘振,比换算燃油流量控制计划的加速时间更小。

Fusion Control of Two Kinds of Control Schedules in Aeroengine Acceleration Process

The rotor acceleration (N-dot) and the corrected fuel flow control schedules are guarantees for the safety and quickness of aeroengine acceleration. However, they are vulnerable to a surge or longer time due to power extraction, performance degradation and the errors of sensors or fuel metering devices. In order to improve the robustness of the controlled acceleration process, a fusion control method based on the two control schedules is proposed. According to the deviation of fuel flow obtained by the two control schedules, the control objectives of the N-dot control schedule are adjusted to obtain the final fuel flow of accelerating process. The simulation results show that the fusion control method can meet the needs of full envelope acceleration control, and it can maintain a wider range of complete acceleration process under the influence of power extraction and errors. Besides, under the same working conditions, the method is less possible to surge than the N-dot control schedule, and has less acceleration time than the corrected fuel flow control schedule.