Investigation of the Effects of Pitch-Roll (De)Coupling on Helicopter Handling Qualities
Investigation of the Effects of Pitch-Roll (De)Coupling on Helicopter Handling Qualities
- New search for: C. L. Blanken
- New search for: H. J. Pausder
- New search for: C. J. Ockier
- New search for: C. L. Blanken
- New search for: H. J. Pausder
- New search for: C. J. Ockier
An extensive investigation of the effects of pitch-roll coupling on helicopter handling qualities was performed by the U.S. Army and Deutsche Forschungsanstalt fur Luft- und Raumfahrt (DLR), using a NASA ground-based and a DLR in-flight simulator. Over 90 different coupling configurations were evaluated using a high gain roll-axis tracking task. The results show that although the current ADS-33C coupling criterion discriminates against those types of coupling typical of conventionally controlled helicopters, it is not always suited for the prediction of handling qualities of helicopters with modern control systems. Based on the observation that high frequency inputs during tracking are used to alleviate coupling, a frequency domain pitch-roll coupling criterion that uses the average coupling ratio between the bandwidth and neutral stability frequency is formulated. This criterion provides a more comprehensive coverage with respect to the different types of coupling, shows excellent consistency, and has the additional benefit that compliance testing data are obtained from the bandwidth/phase delay tests, so that no additional flight testing is needed.
Document information
Investigation of the Effects of Pitch-Roll (De)Coupling on Helicopter Handling Qualities
1995
120 pages
Report
No indication
English
Aerodynamics , Controllability , Coupling , Decoupling , Flight control , Helicopter control , Helicopter performance , Helicopters , Pitch (Inclination) , Roll , Aerodynamic stability , Aircraft safety , Control stability , High gain , Lateral control , Longitudinal control , Simulation , Tracking (Position)