柔性立管阻力特性试验数据处理技术

本文提出3种数据处理方法分析均匀来流中柔性立管的初始阻力特性。首先通过分析柔性立管在均匀来流中的变形及振动情况,分离出立管流向的初始变形对应的弯曲应变。根据复杂梁的弯曲变形理论,建立起弯曲应变与平均阻力之间的微分方程。随后,针对试验中获取的立管轴向力及立管表面弯曲应变,提出计算平均阻力的数据处理方法,并进行算例验证与分析。最终使用提出的数据处理方法分析试验数据,得到立管表面各截面处的阻力分布。

An experimental data processing investigation of the drag force for a flexible riser

In this paper, three different methods of experimental data processing are proposed to investigate the drag force for a flexible riser under uniform current. The steady bending deformation and strain are obtained by analyzing the deformation and vibration of the riser. Based on beam-bending theory, the deformation of the riser is described by a differential equation for the bending strain and drag force. A verification of the three methods is given by processing an example of strain with or without noise. The experimental data of tension and strain are processed differently by the three ways and the drag force are obtained finally.