Under twin variable control with the equal low compressor speed and equal low turbine exit temperature

the twin spool turbojet can obtain higher power performance.In this paper

firstly

the engine dynamic model with two inputs and two outputs is deduced.Then with the aid of LQR theory

the optical regulator of twin variable control system is designed

and the approaches for processing some problems existed in the design process are recommanded.Finally

the control system designed in terms of optical method is simulated numerically.The results show that

in the condition of a state perturbantion on the system

the transient performance of the system recovered to original state is more satisfactory

and the variation of control mediators is in allowable limits of the controllers.