Research on Ramjet Modeling for Control and Multivariable Control System Transform

With the increase of flight Mach number, ramjet has become an ideal power. Due to the rising cost and difficulty of experiments, it is necessary to establish a digital simulation model in the initial stage of the system. First, a quasi-one-dimensional component model establishment method is given, which takes the position of the inlet shock wave system and the dynamics of the actuator into account. The component matching and the calculation of the starting margin of the inlet are realized by constructing a common working equation. Then, according to the existing single-variable control system, a multi-variable control system transformation scheme is designed, and the multi-variable controller design is realized by using the robust guaranteed cost control method. Finally, through the simulation of the ramjet engine and control system, it is shown that the transformed multivariable controller can improve the starting margin of the inlet and increase the safety of the engine under the condition that the thrust response is basically the same.