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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (12): 3657-3667.doi: 10.7527/S1000-6893.2016.0118

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Sliding mode control based multivariable limit management for aircraft engine

DU Xian, GUO Yingqing, SUN Hao, XU Qingshi   

  1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2016-01-08 Revised:2016-04-08 Online:2016-12-15 Published:2016-04-13

Abstract:

To overcome the shortcomings of traditional min-max switching logic with linear regulators for limit management, an improved method is utilized to substitute all linear regulators with nonlinear sliding mode regulators. Based on this improved approach, a multi-input control strategy, along with a new innovative switching logic and a multivariable sliding mode regulator as the main controller, is proposed to remove the conservatism of the traditional min-max approach and to take advantage of all the actuators for enhanced performance. The steady-state working regulators under the new switching logic are analyzed, and necessary and sufficient conditions are established to ensure that the main regulator is active for accurate tracking at steady state. Simulation results show that the proposed multi-input strategy is superior to the improved single-input sliding mode controller in min-max structure. The new method owns the ability to achieve the tracking task under more tight constraints, the settling time of the possibility of pursing faster response is shortened from 1.91 s to 1.54 s, and the fuel consumption at steady state is lowered for the same control objectives.

Key words: turbofan engines, limit management, min-max switching logic, sliding mode control, multivariable control

CLC Number: