NDLI: Comparison of vane type external excitation and Free Air Turbulence Methods for flutter flight testing

Content Provider	IEEE Xplore Digital Library
Author	Usman Hafeez, M. Ajmal, M. Khan, T.A. Khan, Z.
Copyright Year	2013
Description	Author affiliation: Centres of Excellence in Sci. & Appl. Technol. (CESAT), Islamabad, Pakistan (Usman Hafeez, M.; Ajmal, M.; Khan, T.A.; Khan, Z.)
Abstract	Structure excitation plays a key role in evaluating the stability of the aircraft during flutter flight test. Various techniques are used for the excitation of aircraft during flutter flight test. Each technique has its own merits and demerits depending upon the type and application of exciters. This paper describes the comparison of rotating cylinder vane type excitation system (external) with free air turbulence (natural). Different performance parameters like excitation force, frequency range and phase difference of the flutter exciters were evaluated based on the flight test data. Free air turbulence was able to excite low frequency modes (<; 20 Hz) with small amplitudes. Whereas the rotating cylinder system excited the complete required range (up to 50 Hz) with significantly higher amplitudes. Major difference can be seen in the performance like high signal to noise ratio, suitable identification of elastic modes, appropriate in-phase and out-of-phase excitation to the aircraft as compared to free air turbulence. Rotating cylinder excitation systems is a more efficient way of doing flutter flight testing as it results in significant reduction in time of flight tests and better estimation of structural identification.
Starting Page	136
Ending Page	140
File Size	1776050
Page Count	5
File Format	PDF
ISBN	9781467344258
e-ISBN	9781467344265
DOI	10.1109/IBCAST.2013.6512146
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-15
Publisher Place	Pakistan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency-domain analysis Instruments Estimation Frequency estimation Sensors Rotation measurement
Content Type	Text
Resource Type	Article

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