Dynamic Response Analysis of Submerged Floating Tunnel Cable in Non-Uniform Flow Environment
To study the dynamic response of the submerged floating tunnel(SFT)cable under the action of non-uniform flow,a coupled vibration model of the cable and tube was established.The vibration governing equations for the SFT cable-tube system in an exponential flow field environment were established based on the Hamilton principle.The dynamic response of a SFT cable was obtained,and the effects of maximum flow velocity and frequency ratio of the tube and cable on the dynamic response were analyzed.The results show that in non-uniform flow,the SFT cable exhibits multi-frequency vibration.With the increase of flow velocity,the maximum displacement value of the cable does not increase,but the higher order modes of the cable can be stimulated to participate in the vibration and the main vibration mode conversion occurs.When the vortex excitation frequency is close to the modal frequency of the cable,the cable appears to have vortex resonance,and the maximum displacement value of the cable occurs at the peak of the main vibration mode.When the ratio of the tube mass frequency to the cable main vibration frequency is 2,the cable shows the combined effect of vortex induced vibration and parametric resonance.
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