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Effects of Blade to Blade Dissimilarities on Rotor Body Lead Lag DynamicsSmall blade-to-blade property differences are investigated to determine how they affect the behavior of a simple rotor-body system. An analytical approach is used which emphasizes the significance of these effects from the experimental point of view. It is found that the primary effect of blade-to-blade dissimilarities is the appearance of additional peaks in the frequency spectrum which are separated from the conventional response peaks by multiples of the rotor speed. These additional responses are potential experimental problems because when they occur near a mode of interest they act as contaminant frequencies which can make damping measurements difficult. Increased rotor-body coupling and a rotor shaft degree of freedom act to improve the situation by altering the frequency separation of the modes.
Document ID
19990111579
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
McNulty, Michael J.
(Army Aviation Systems Command Moffett Field, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1985
Subject Category
Aerodynamics
Meeting Information
Meeting: European Rotorcraft
Location: London
Country: United Kingdom
Start Date: September 1, 1985
Distribution Limits
Public
Copyright
Other

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