Modeling and identification of freeplay nonlinearity
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
04/11/2013
04/11/2013
2012
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Resumo |
A nonlinear analysis is performed for the purpose of identification of the pitch freeplay nonlinearity and its effect on the type of bifurcation of a two degree-of-freedom aeroelastic system. The databases for the identification are generated from experimental investigations of a pitch-plunge rigid airfoil supported by a nonlinear torsional spring. Experimental data and linear analysis are performed to validate the parameters of the linearized equations. Based on the periodic responses of the experimental data which included the flutter frequency and its third harmonics, the freeplay nonlinearity is approximated by a polynomial expansion up to the third order. This representation allows us to use the normal form of the Hopf bifurcation to characterize the type of instability. Based on numerical integrations, the coefficients of the polynomial expansion representing the freeplay nonlinearity are identified. Published by Elsevier Ltd. State of Sao Paulo Research Agency (FAPESP), Brazil [2007/08459-1] State of Sao Paulo Research Agency (FAPESP), Brazil Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil [0205109] Coordination for the Improvement of Higher Education Personnel (CAPES), Brazil |
Identificador |
JOURNAL OF SOUND AND VIBRATION, LONDON, v. 331, n. 8, pp. 1898-1907, APR, 2012 0022-460X http://www.producao.usp.br/handle/BDPI/37869 10.1016/j.jsv.2011.12.021 |
Idioma(s) |
eng |
Publicador |
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD LONDON |
Relação |
JOURNAL OF SOUND AND VIBRATION |
Direitos |
closedAccess Copyright ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
Palavras-Chave | #AEROELASTICITY #AIRFOIL #ACOUSTICS #ENGINEERING, MECHANICAL #MECHANICS |
Tipo |
article original article publishedVersion |