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Optical detection of blade flutterThe paper examines the capabilities of photoelectric scanning (PES) and stroboscopic imagery (SI) as optical monitoring tools for detection of the onset of flutter in the fan blades of an aircraft gas turbine engine. Both optical techniques give visual data in real time as well as video-tape records. PES is shown to be an ideal flutter monitor, since a single cathode ray tube displays the behavior of all the blades in a stage simultaneously. Operation of the SI system continuously while searching for a flutter condition imposes severe demands on the flash tube and affects its reliability, thus limiting its use as a flutter monitor. A better method of operation is to search for flutter with the PES and limit the use of SI to those times when the PES indicates interesting blade activity.
Document ID
19770045725
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nieberding, W. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Pollack, J. L.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1977
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
ASME PAPER 77-GT-66
Meeting Information
Meeting: Gas Turbine Conference and Products Show
Location: Philadelphia, PA
Start Date: March 27, 1977
End Date: March 31, 1977
Sponsors: American Society of Mechanical Engineers
Accession Number
77A28577
Distribution Limits
Public
Copyright
Other

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