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Power Measurement Errors on a Utility AircraftExtensive flight test data obtained from two recent performance tests of a UH 60A aircraft are reviewed. A power difference is calculated from the power balance equation and is used to examine power measurement errors. It is shown that the baseline measurement errors are highly non-Gaussian in their frequency distribution and are therefore influenced by additional, unquantified variables. Linear regression is used to examine the influence of other variables and it is shown that a substantial portion of the variance depends upon measurements of atmospheric parameters. Correcting for temperature dependence, although reducing the variance in the measurement errors, still leaves unquantified effects. Examination of the power difference over individual test runs indicates significant errors from drift, although it is unclear how these may be corrected. In an idealized case, where the drift is correctable, it is shown that the power measurement errors are significantly reduced and the error distribution is Gaussian. A new flight test program is recommended that will quantify the thermal environment for all torque measurements on the UH 60. Subsequently, the torque measurement systems will be recalibrated based on the measured thermal environment and a new power measurement assessment performed.
Document ID
20030062755
Acquisition Source
Ames Research Center
Document Type
Conference Paper
External Source(s)
Authors
Bousman, William G.
(Army Aviation and Missile Command Moffett Field, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 23, 2002
Subject Category
Aircraft Propulsion And Power
Meeting Information
Meeting: American Helicopter Society Aerodynamics, Acoustics and Test and Evaluation Technical Specialist Meeting
Location: San Francisco, CA
Country: United States
Start Date: January 23, 2002
End Date: January 25, 2002
Sponsors: American Helicopter Society, Inc.
Distribution Limits
Public
Copyright
Other

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