NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
An Empirical Correction Method for Improving off-Axes Response Prediction in Component Type Flight Mechanics Helicopter ModelsHistorically, component-type flight mechanics simulation models of helicopters have been unable to satisfactorily predict the roll response to pitch stick input and the pitch response to roll stick input off-axes responses. In the study presented here, simple first-order low-pass filtering of the elemental lift and drag forces was considered as a means of improving the correlation. The method was applied to a blade-element model of the AH-64 APache, and responses of the modified model were compared with flight data in hover and forward flight. Results indicate that significant improvement in the off-axes responses can be achieved in hover. In forward flight, however, the best correlation in the longitudinal and lateral off-axes responses required different values of the filter time constant for each axis. A compromise value was selected and was shown to result in good overall improvement in the off-axes responses. The paper describes both the method and the model used for its implementation, and presents results obtained at hover and in forward flight.
Document ID
19970021150
Acquisition Source
Ames Research Center
Document Type
Technical Memorandum (TM)
Authors
Mansur, M. Hossein (Army Aviation Systems Command Moffett Field, CA United States)
Tischler, Mark B. (Army Aviation Systems Command Moffett Field, CA United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1997
Subject Category
Aeronautics (General)
Report/Patent Number
NAS 1.15:110406
NASA-TM-110406
A-961022
USAATCOM-96-A-010
Accession Number
97N22209
Funding Number(s)
PROJECT: RTOP 505-59-36
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available