The aeroelastic stability of a multi-body system is studied through a four-degree-of-freedom model, which describes the linearized section dynamics of particular suspended bridges with doubly-symmetric cross-section, subject to a lateral stationary wind flow. A multi-parameter perturbation solution, applied on the classic modal problem in internal resonance conditions, allows a consistent reduction of the model dimensions. The bifurcation scenario described by a local stability analysis in the resonance region is featured by two stability boundaries, strongly interacting in the parameter space. The analysis of the critical wind velocity provides satisfying engineering results, pointing out how resonant light cables or dissipative cable-deck couplings may have beneficial effects in preventing the aeroelastic instability.
"Aeroelastic stability of a symmetric multi-body sectional model"
LEPIDI, MARCO;PICCARDO, GIUSEPPE
2013-01-01
Abstract
The aeroelastic stability of a multi-body system is studied through a four-degree-of-freedom model, which describes the linearized section dynamics of particular suspended bridges with doubly-symmetric cross-section, subject to a lateral stationary wind flow. A multi-parameter perturbation solution, applied on the classic modal problem in internal resonance conditions, allows a consistent reduction of the model dimensions. The bifurcation scenario described by a local stability analysis in the resonance region is featured by two stability boundaries, strongly interacting in the parameter space. The analysis of the critical wind velocity provides satisfying engineering results, pointing out how resonant light cables or dissipative cable-deck couplings may have beneficial effects in preventing the aeroelastic instability.
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