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首页> 外文期刊>International Journal of Pressure Vessels and Piping >Seabed stiffness influences and water damping effects on vibration of the touchdown zone in a steel catenary riser
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Seabed stiffness influences and water damping effects on vibration of the touchdown zone in a steel catenary riser

机译：海床刚度影响和水阻尼效应钢关联立管触发区的触地带振动

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摘要

Using a submerged pipeline section modeling the touchdown zone (TDZ) of a steel catenary riser (SCR), a sequence of contrast experiments were carried out to investigate the influences of seabed stiffness and water damping. Acceleration signals and bending strains at discrete positions along the TDZ pipe model were recorded during the testing, and by dealing with response-only data using the frequency domain decomposition method (FDDM) the results characterizing TDZ dynamic behaviors were acquired. These results indicate that under the excitation from the seabed model the complex modal responses appear with much higher frequencies than the end-loading one, similar to the dynamic response of a SCR TDZ, whose practical vibration frequencies are much higher than the heave motion of a hull. Identifications of complex modal parameters have proven to be effective using experimental response data, and this identification process can be applied in SCR TDZ monitoring to investigate seabed stiffness influences and water damping effects.
机译：使用浸没管道截面模型钢带绕细胞立管（SCR）的触地带（TDZ），进行了一系列对比实验，以研究海底刚度和水阻尼的影响。在测试期间记录了沿TDZ管道模型的离散位置处的加速信号和弯曲菌株，并通过使用频域分解方法（FDDM）处理仅对TDZ动态行为的结果进行响应数据。这些结果表明，在海底模型的激发下，复杂的模态响应出现比最终装载更高的频率，类似于SCR TDZ的动态响应，其实际振动频率远高于a的升高运动船体。复杂模态参数的标识已被证明使用实验响应数据有效，并且该识别过程可以应用于SCR TDZ监测，以研究海底刚度影响和水阻尼效应。

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