Abstract: The application of multivariable robust control methods to aeroengines was testified by a semi-physical simulation. The detailed design procedure of an H_∞/LTR control module for the aeroengine control system was also included. From the simulation results, it is clear that the H_∞/LTR controller stabilized the whole system in semi-physical simulation environment. This is much different from the LQG/LTR controller that is unstable under the same condition. Further more, one can find that the H_∞/LTR method has good noise rejection property. Thirdly, the controller, based only on the intermediate power level of one point in the envelope, offers satisfactory performance for a large area in the envelope in the augmented and un-augmented simulation. Therefore, it is experimentally testified that H_∞/LTR method is a multivariable robust control design method that can be practically applied to engineering environment. Finally, the success of this semi-physical simulation shows that the research of multivariable control methods has a big progress in the direction of practical application to aeroengine control system.

Key words: aeroengine, H_∞/LTR, LQG/LTR, semi-physical simulation