THINPREP HPV IN SITU HYBRIDIZATION WITH PNA PROBES

Not Available The use of an Automated Flutter-suppression System (AFS) increases the challenge of flutter flight-testing because the aircraft is required to fly in a region where it is open loop unstable. Paradoxically, the presence of the AFS can be exploited to anticipate the onset of wing flutter. The phase margin of the AFS control loops and the closed loop damage of critical modes are highlighted as critical parameters to be monitored. Sources of destabilizing phase lag will be identified and quantified, such as dynamic pressure changes and, importantly, actuator rate limiting. We will use Wavelet Transform (WT) techniques for the real-time processing, analysis and visualization of the flutter test data, ultimately to predict the onset of closed-loop flutter. The WT will be used for innovative time-varying transfer function and parameter identification. In Phase I we will develop an idealized 2D wing simulation, implement if available a more realistic flexible wing model, develop a Matlab toolbox that implements the analysis methods on flight data, and write specifications for further software development. Based on this work we will recommend modification to flutter testing technique. In Phase II the software will be further developed and integrated with existing control room hardware.