Abstract
A modified LPV (Linear Parameter Varying) modeling technique for nonlinear system was put forward and is applied in a turbofan engine model and control analysis. First, a quasi-LPV model of a turbofan engine is designed at various engine operating points using linearized models and the scheduling variable is the fan speed. Then, according to the feedback method, the quasi-LPV model is modified by using an estimated fuel, which is calculated by using the scheduling variable and feedbacked, and a PI regulator. Last, the simulation results about a speedup process in opened-loop system and closed-loop control system of the turbofan engine show that the modified LPV model achieved much higher steady precision and fidelity than the quasi-LPV model.
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