In the present paper the nonlinear discrete model of a cable driven by a turbulent wind is proposed in order to take into account an arbitrary number of structural modes and of wind modes, obtaining a system of firstorder ordinary differential equations driven by a vector of independent random processes. Nonlinearities and parametric-excitation terms deriving from fluid-structure interaction are fully included. The convergence of the modal expansions is preliminarily discussed through a realistic wind-excited cable. The first examples highlights as higher modes can slightly modify the power spectral density function and the probabilistic density function of the response, especially as regards in-plane motion, but they do not introduce any qualitative difference.
A nonlinear discrete model for wind-excited suspended cables
CARASSALE, LUIGI;PICCARDO, GIUSEPPE
2004-01-01
Abstract
In the present paper the nonlinear discrete model of a cable driven by a turbulent wind is proposed in order to take into account an arbitrary number of structural modes and of wind modes, obtaining a system of firstorder ordinary differential equations driven by a vector of independent random processes. Nonlinearities and parametric-excitation terms deriving from fluid-structure interaction are fully included. The convergence of the modal expansions is preliminarily discussed through a realistic wind-excited cable. The first examples highlights as higher modes can slightly modify the power spectral density function and the probabilistic density function of the response, especially as regards in-plane motion, but they do not introduce any qualitative difference.
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