Effects of internal friction on the dynamic behavior of aeroelastic systems

G. G. Choi, A. M. Agelastps, Marc Mignolet, D. D. Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

This paper focuses on the effects of friction, internal to an aircraft, on the level and characteristics of preexisting limit cycle oscillations. Two different models are investigated in this context. First, a simple two-degree-of-freedom mass-spring system is considered in which the aerodynamic forces are globally represented through a van der Pol force acting on the largest mass while friction takes place during relative motions of the two masses. The second system considered involves an airfoil pitching and plunging in a low speed flow. A full aerodynamic - structural feedback is considered and friction is introduced through a torsional degree-of-freedom internal to the airfoil. The results obtained with both models demonstrate the strong potential of internal friction to reduce existing LCO provided that the torsional degree of freedom acts as a "tuned damper" for the system. The existence of multiple stable solutions is demonstrated when the coefficient of friction is small and the nature of the system response, i.e. single/multiple frequency and slip-stick/continuous slip motions is discussed. In the aeroelastic model, it is finally seen that the amplitude of response of the system can be increased by the addition of the torsional degree of freedom.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Pages854-862
Number of pages9
Volume2
StatePublished - 2004
EventCollect. of Pap. - 45th AIAA/ASME/ASCE/AHS/ASC Struct., Struct. Dyn. and Mater. Conf.; 12th AIAA/ASME/AHS Adapt. Struct. Conf.; 6th AIAA Non-Deterministic Approaches Forum; 5th AIAA Gossamer Spacecraft Forum - Palm Springs, CA, United States
Duration: Apr 19 2004Apr 22 2004

Other

OtherCollect. of Pap. - 45th AIAA/ASME/ASCE/AHS/ASC Struct., Struct. Dyn. and Mater. Conf.; 12th AIAA/ASME/AHS Adapt. Struct. Conf.; 6th AIAA Non-Deterministic Approaches Forum; 5th AIAA Gossamer Spacecraft Forum
CountryUnited States
CityPalm Springs, CA
Period4/19/044/22/04

ASJC Scopus subject areas

  • Architecture

Fingerprint Dive into the research topics of 'Effects of internal friction on the dynamic behavior of aeroelastic systems'. Together they form a unique fingerprint.

Cite this