微分求积法分析水下输流管道的竖向动力特性

Differential-Quadrature Method to Analyze Vertical Dynamic Characteristics of Submarine Fluid Conveying Pipeline

在复杂的海洋和河流环境条件下,水下输流管道的动力特性受到内外流体等耦合作用的影响,呈现与陆地管道不同的特点.尝试用微分求积法(DQM)来分析水下输流管道的竖向振动特性,综合考虑内流因素(包括流速、压强)和外流因素(包括流速、阻尼)以及轴向力对管跨段竖向振动的影响.计算分析了水下输流管道悬跨段的动力特性及允许跨长随内外流流速、轴向力、管内压强等的变化情况.结果表明,DQM用于水下管跨段的动力特性和疲劳分析、可靠性分析及设计是可行的.

Under the hostile submarine conditions, the dynamic characteristics of a submarine fluid conveying pipeline in a suspended span is quiet different from those of a pipeline on land, which was affected by the coupling effect of the flows inside and outside the pipeline. An attempt is made to use the differential-quadrature method （DQM） to solve the vertical vibration of the pipeline, with the influence of both the inside and outside parameters on the vertical vibration taken into account, such as the flowrate and fluid pressure inside the pipeline, the flowrate and damping outside the pipeline and axial force. The dynamical characteristics and how the permitted suspended span varies with the flowrate inside and outside the pipeline, axial force and fluid pressure inside the pipeline were calculated and analyzed. The results indicated that DQM is successful to the analyses of dynamical characteristics of the pipeline suspended span and its fatigue and reliability design.