NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Wing/store flutter with nonlinear pylon stiffnessRecent wind tunnel tests and analytical studies show that a store mounted on a pylon with 'soft' pitch stiffness provides substantial increase in flutter speed of fighter aircraft and reduces dependency of flutter on mass and inertia of the store. This concept, termed the decoupler pylon, utilizes a low-frequency control system to maintain pitch alignment of the store during maneuvers and changing flight conditions. Under rapidly changing transient loads, however, the alignment control system may allow the store to momentarily bottom against a relatively stiff backup structure in which case the pylon stiffness acts as a hardening nonlinear spring. Such structural nonlinearities are known to affect not only the flutter speed but also the basic behavior of the instability. This paper examines the influence of pylon stiffness nonlinearities on the flutter characteristics of wing-mounted external stores.
Document ID
19800050905
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Desmarais, R. N.
(NASA Langley Research Center Hampton, VA, United States)
Reed, W. H., III
(NASA Langley Research Center Structures and Dynamics Div., Hampton, Va., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Aircraft Stability And Control
Report/Patent Number
AIAA PAPER 80-0792
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference
Location: Seattle, WA
Start Date: May 12, 1980
End Date: May 14, 1980
Accession Number
80A35075
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available