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以一类八层非粘结柔性立管为研究对象,对防摩擦层分别采用计入实际几何形状的螺旋带模型和简化的圆柱壳模型,采用理论和数值方法计算立管在不同边界下的轴向及扭转刚度.计算结果表明:数值解与理论值符合较好;在轴向拉力、逆时针扭矩、顺时针扭矩(限制立管轴向位移)下,使用两种防摩擦层模型对立管刚度影响可以忽略;在轴向压力、顺时针扭矩(自由边界)下,采用圆柱壳模拟防摩擦层会大幅增大立管刚度.
Taking a kind of eight-layer non-bonded flexible riser as the research object, the anti-friction layer is modeled by a spiral belt model and a simplified cylindrical shell model, respectively. The theoretical and numerical methods are used to calculate the riser pipe under different boundaries Axial and torsional stiffness. The calculated results show that the numerical solution is in good agreement with the theoretical value. Under the condition of axial tension, counterclockwise torque and clockwise torque (limiting axial displacement of riser), two anti-friction layer models The effect of stiffness is negligible; the use of a cylindrical shell to simulate the anti-friction layer will significantly increase the riser stiffness at axial pressure, clockwise torque (free boundary).