Frequency- and time-domain methods for the numerical modeling of full-bridge aeroelasticity
- 作者：L. Salvatori ; C. Borri
- 关键词：Bridge aeroelasticity ; Unsteady wind load ; Indicial functions ; Multi-modal analysis ; Time-domain analysis ; Flutter instability
- 刊名：Computers and Structures
- 出版年：2007
- 期刊代码：39_00457949
- 类别：cp
- 出版时间：June-July 2007
- 卷：85
- 期：11-14
- 页码：675-687
- 文件大小：401 K
摘要
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.