Optimal design of passive viscous dampers for controlling the resonant response of orthotropic plates under high-speed moving loads
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http://dx.doi.org/10.1016/j.jsv.2010.10.017 |
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Title
Optimal design of passive viscous dampers for controlling the resonant response of orthotropic plates under high-speed moving loadsDate
2011Publisher
ElsevierISSN
0022-460XBibliographic citation
Journal of Sound and Vibration (Mar. 2011) vol. 330, no. 7, p. 1328-1351Type
info:eu-repo/semantics/articlePublisher version
http://www.sciencedirect.com/science/article/pii/S0022460X10006784Subject
Abstract
In this article, the resonant response of plates traversed by moving loads is addressed being its main application the dynamic performance of railway bridges underhigh-speed traffic. An innovative alternative to reduce ... [+]
In this article, the resonant response of plates traversed by moving loads is addressed being its main application the dynamic performance of railway bridges underhigh-speed traffic. An innovative alternative to reduce the deck inadmissible oscillations that may appear in short simply supported structures in resonant conditions is proposed, based on artificially increasing the superstructure damping by retrofitting the deck with fluid viscous dampers. A particular auxiliary structure transforming the deck vertical deflection into relative movement within the devices is envisaged, being the main objectives of the study to optimise the retrofitting system parameters and to prove its efficiency under the action of railway vehicles. For these purposes, the retrofitted deck behaviour is first investigated using an orthotropicplate model underharmonic excitation. On the basis of an analytical approach, a dimensionless version of the equations of motion is presented, the governing parameters are extracted and an intensive sensitivity analysis of the plate response is performed. Finally, analytical closed-form expressions for the optimal dampers constants are derived and their adequacy is numerically evaluated. To this end, an existing bridge belonging to the Spanish Railway network is analysed using a three-dimensional finite element code specifically programmed by the authors for this application. In the end the controlling effect of the retrofitting system and the applicability of the optimal parameters analytical expressions are proven for a wide range of circulating velocities. [-]
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