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Parametric vibration of submerged floating tunnel tether under random excitation
Authors:Sheng-nan Sun  Zhi-bin Su
Affiliation:SUN Sheng-nan and SU Zhi-bin 1 School of Architecture and Civil Engineering,Liaocheng University,Liaocheng 252059,China
Abstract:For the study of the parametric vibration response of submerged floating tunnel tether under random excitation, a nonlinear random parametric vibration equation of coupled tether and tube of submerged floating tunnel is set up. Subsequently, vibration response of tether in the tether-tube system is analyzed by Monte Carlo method. It may be concluded that when the tube is subjected to zero-mean Gaussian white noise random excitation, the displacement and velocity root mean square responses of tether reach the peak if the circular frequency of tube doubles that of tether; the displacement and velocity root mean square responses of tether increase as the random excitation root mean square increases; owing to the damping force of water, the displacement and velocity root mean square responses of tether decrease rapidly compared with tether in air; increasing the damping of the tether or tube reduces the displacement and velocity root mean square responses of tether; the large-amplitude vibration of tether may be avoided by locating dampers on the tether or tube.
Keywords:ocean engineering  submerged floating tunnel  tether  parametric vibration  random excitation
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