Frequency- and time-domain methods for the numerical modeling of full-bridge aeroelasticity

Authors:
L. Salvatori;C. Borri
Affiliations:
Centro di Ricerca Interuniversitario di Aerodinamica delle Costruzioni ed Ingegneria del Vento (CRIACIV), c/o Dipartimento di Ingegneria Civile, Universití degli Studi di Firenze, via di Sant ...;Centro di Ricerca Interuniversitario di Aerodinamica delle Costruzioni ed Ingegneria del Vento (CRIACIV), c/o Dipartimento di Ingegneria Civile, Universití degli Studi di Firenze, via di Sant ...
Venue:
Computers and Structures
Year:
2007

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Abstract

A numerical framework for full-bridge aeroelasticity is presented, based on unsteady cross-sectional load models and on the finite-element modeling of the structure. A frequency-domain approach based on aeroelastic derivatives and nonlinear complex eigenvalue analysis is compared to its equivalent time-domain counterpart based on indicial functions and direct integration of the equations of motion. A version of the time-domain load model consistent with the quasi-steady limit behavior is developed and a procedure for the numerical identification of the indicial functions from measured aeroelastic derivatives is presented. The aeroelastic stability analysis is chosen as benchmark. A numerical example is offered where the equivalency of the two approaches is proved for a full-bridge model. Advantages and disadvantages of the two techniques are discussed.