Aircraft engine controllers are designed and operated to provide
desired performance and stability margins. The purpose of
life-extending-control (LEC) is to study the relationship between
control action and engine component life usage, and to design an
intelligent control algorithm to provide proper trade-offs between
performance and engine life usage. The benefit of this approach is
that it is expected to maintain safety while minimizing the overall
operating costs. With the advances of computer technology, engine
operation models, and damage physics, it is necessary to reevaluate
the control strategy fro overall operating cost consideration. This
paper uses the thermo-mechanical fatigue (TMF) of a critical
component to demonstrate how an intelligent engine control
algorithm can drastically reduce the engine life usage with minimum
sacrifice in performance. A Monte Carlo simulation is also
performed to evaluate the likely engine damage accumulation under
various operating conditions. The simulation results show that an
optimized acceleration schedule can provide a significant life
saving in selected engine components.
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