在建导管架平台圆管风致涡激振动及减振研究

研究了大型导管架平台卧式建造时出现单边约束圆管的风致涡激振动问题。将建造过程中单边约束的导管架圆管简化成悬臂梁模型,采用van der Pol尾流振子模型模拟圆管受到的流体力,建立了圆管风致涡激振动动力学方程。使用伽辽金方法对建立的运动方程进行求解,数值分析了圆管在特定约化风速下的涡激振动特性。在圆管上附加非线性能量阱(NES)作为被动减振装置对圆管进行减振,并采用粒子群优化算法对NES的非线性刚度和阻尼参数进行了优化。结果表明,在约化速度为4.8时,得到的NES优化的非线性刚度和阻尼参数组合可以有效减小悬臂梁自由端风致涡激振动位移。本研究说明采用NES和粒子群优化算法可以有效减小圆管的风致涡激振动,为导管架安全建造提供一定的参考。

The wind-vortex-induced vibration and vibration reduction analysis of pipe for jacket platform under construction

The wind-vortex-induced vibration of unilaterally constrained pipe was investigated during the horizontal construction of the jacket. In this paper, the unilaterally constrained jacket pipe during the construction process is simplified into a cantilever beam, and the van der Pol wake oscillator model is used to simulate the fluid force on the pipe, and the dynamic equation of the wind-induced vortex-induced vibration of the pipe is established. The Galerkin method is used to solve the equation of motion, and the vortex-induced vibration characteristics of a pipe under a specific reduced wind speed are numerically analyzed. A nonlinear energy sink is added to the pipe as a passive damping device to reduce the vibration of the pipe, and the particle swarm optimization algorithm is used to optimize the nonlinear stiffness and damping parameters of the NES. The results show that when the reduced speed is 4.8, the obtained NES optimized parameters can effectively reduce the wind-vortex-induced vibration displacement at the free end of the cantilever beam. This study shows that the use of NES and particle swarm optimization algorithm can effectively decrease the wind-vortex-induced vibration of the pipe, and provide a certain reference for the safe construction of jackets.