Sequential Quadratic Programming Method In Optimal Control In The Process Of Aero-engine Afterburner

The transient performance of aero-engine is one of an important measure for military aircraft. However, the aero-engine is a complicated thermal machine, whose mathematical model and objective function are strong nonlinear, and subjected to many constrains in the control process. It is proved by practice that the traditional optimal control method, when used to aero-engine acceleration, is not quite satisfactory. The SQP (Sequential Quadratic Programming) algorithm is one of the most successful methods for solving nonlinear constrained problem. A nonlinear optimal control method for aero-engine afterburner process, which is based on the SQP algorithm, is presented in this paper.In the optimal control algorithm, many performance constraints that exist in the actual aero-engine afterburner process are considered. Besides, the constraints of control variable, such as the change rate and the change range, are also taken into account. The optimal control algorithms for the aero-engine afterburner process are programmed and the simulated based on the Visual C++ 6.0.Simulation results proved preliminarily that the nonlinear optimal control method, which presented in this paper, is effective for aero-engine afterburner process and can improves the aero-engine dynamic performance greatly with each constraint is always satisfied.