流作用下悬浮隧道张力腿的涡激动力响应

Vortex-Induced Dynamic Response of Tension Legs for Submerged Floating Tunnel under Current Effect

利用张力腿涡激振动方程,在考虑非线性流体阻尼和参数激励的条件下,应用伽辽金法和数值积分法,计算分析了参数激励频率对张力腿1阶涡激动力响应的影响,得出了位移响应、动弯矩、动剪力与参数激励频率的关系.计算结果表明,当参数激励频率为张力腿1阶固有频率的2倍时,张力腿的位移响应与跨中点的动弯距均达到最大.

Based on the equations of vortex-induced oscillation of tension legs, the effect of parametric excitation frequency on the first-order dynamic response of a tension leg was investigated by considering the non-linear fluid damping and parametric excitation. In the investigation, the Galerkin method and the numerical integration were used. Numerical relationships between displacement response, dynamic moment and dynamic shearing force and parametric excitation frequency were obtained. The calculated result shows that the displacement response and the dynamic moment at mid-span both reach their maximums when the parametric excitation frequency is twice as large as the first-order natural frequency of a tension leg.