Global optimization of transport aircraft is performed to minimize fuel burn for a specified mission. The design space includes the geometry, wing airfoils, primary structure, engine size and cycle parameters, and the flight profile parameters. The method employs a number of physics-based models for structural sizing and weight estimation, viscous CFD for all major aerodynamic components, and a...

Kalman filters are often used to estimate the state variables of a dynamic system. However, in the application of Kalman filters some known signal information is often either ignored or dealt with heuristically. For instance, state variable constraints (which may be based on physical considerations) are often neglected because they do not fit easily into the structure of the Kalman filter. This...

H∞ filters (also called minimax filters) can estimate the state variables of a dynamic system. However, in the application of state estimators, some known signal information is often either ignored or dealt with heuristically. For instance, state variable constraints (which may be based on physical considerations) are often neglected because they do not fit easily into the structure of state es...

This investigation presents an active stability control system on a twin-spool turbofan engine to recover from unstable operating conditions or to avoid them. Therefor air injection in the tip region ahead of the first low pressure compressor (LPC) rotor is used to damp any instabilities and their precursors. A high frequency instrumentation is applied to detect the flow disturbances and to fee...

The main focus of this study is to apply a computational tool for the flow analysis of the turbine engine that has been tested with ice crystal ingestion in the Propulsion Systems Laboratory (PSL) at NASA Glenn Research Center. The PSL has been used to test a highly instrumented Honeywell ALF502R-5A (LF11) turbofan engine at simulated altitude operating conditions. Test data analysis with an en...

In this paper the problem of health parameter estimation in an aero-engine is investigated by using an unknown input observer-based methodology, implemented by a second-order sliding mode observer (SOSMO). Unlike the conventional state estimator-based schemes, such as Kalman filters (KF) and sliding mode observers (SMO), the proposed scheme uses a “reconstruction signal” to estimate health para...

Electrified aircraft propulsion enables new designs with fewer emissions. One challenge of electrified architectures is handling the electrical components’ waste heat. This because batteries and other components are sensitive to high temperatures accumulate heat within their structure. In this work, we investigate using a thermoacoustic refrigerator cool battery parallel hybrid single-aisle com...

One of the problems that occur in our earth is air pollution and depletion fossil fuel stocks. Researchers want to make research on how burns completely, so resulting exhaust gas environmentally friendly. In addition, this expected as an education comparison before after turbofan given. This study will control AFR (Air Fuel Ratio) intake get right ratio stoichiometry. By controlling into engine...