A low bypass ratio turbofan engine operates in a hostile environment, resulting performance degradation. This seriously affects the security and reliability of engine. Therefore, degradation evaluation method for engines based on flight data is proposed. The expands equation system to solve underdetermined problem caused by lack sensors multiple operating point analysis. improved evolution algo...

To my family, anna and ammu ACKNOWLEDGEMENT I would like to express my sincere indebtness and gratitude to my thesis advisor Dr. Dan Simon, for the ingenious commitment, encouragement and highly valuable advice he provided me over the entire course of this thesis. I would also like to thank my committee members Dr. Zhiqiang Gao and Dr. Sridhar Ungarala for their support and advice. I wish thank...

Abstract One of the most important new engine concepts is Geared turbofan. In these engines a gear box allows decoupling between fan and turbine rotational speeds. As consequence, separate aerodynamic optimization both components becomes possible leading to an increase in bypass ratios, higher propulsive efficiency lower specific fuel consumption. The multi-stage intermediate pressure (IPT) one...

The engine control system for civil transport aircraft imposes operational limits on the propulsion system to ensure compliance with safety standards. However, during certain emergency situations, aircraft survivability may benefit from engine performance beyond its normal limits despite the increased risk of failure. Accordingly, control modes were developed to improve the maximum thrust outpu...