Publication:
Wing rock as a lateral-directional aircraft limit cycle oscillations induced by nonlinear aerodynamics occurring at high angle of attack

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Authors
Young, Paul David
Subjects
Advisors
Schmidt, L.V.
Date of Issue
1977-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Wing rock at high angle of attack is an oscillatory lateral-directional motion phenomenon known to exist in some of today's high performance tactical aircraft. The motion has been consistently characterized as a lightly damped Dutch-Roll oscillation attributable to asymmetric wing stall. However, evidence gathered from wind tunnel simulations and at least one British study indicate that aerodynamic nonlinearit ies may be the source of wing rock. Regardless of the actual cause of the phenomenon, a study of wing rock has positive ramifications with respect to gaining a clearer understanding of the aerodynamics associated with high angle of attack flight. This report presents the results of an investigation of wing rock which centered on the premise that two distinct nonlinear aerodynamic mechanisms (aerodynamic hysteresis and a cubic nonlinearity in yawing moment) not only can cause wing rock but may drive it to a limit cycle oscillation as well.
Type
Thesis
Description
Series/Report No
Department
Aeronautics
Organization
Naval Postgraduate School
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NPS Report Number
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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