| Full text | |
| Author(s): |
Total Authors: 4
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| Affiliation: | [1] Virginia Polytech Inst & State Univ, Dept Engn Sci & Mech, Blacksburg, VA 24061 - USA
[2] Univ Sao Paulo, Lab Aeroelast, Sao Carlos, SP - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Journal of Sound and Vibration; v. 331, n. 8, p. 1898-1907, APR 9 2012. |
| Web of Science Citations: | 26 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 07/08459-1 - Nonlinear aeroelastic time series analysis: an experimental study |
| Grantee: | Rui Marcos Grombone de Vasconcellos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |