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为了提出一种流固耦合分析方法用以模拟和分析风致振动现象,通过将拉索-亮化灯具系统的流场简化为相对来流有一定攻角的三圆柱串列模型,将系统振动模型简化为质量-弹簧-阻尼系统,采用SST湍流模型,结合特别设计的网格划分技术,应用ANSYS CFX软件及User Fortran工具自行开发结构动力分析程序,对特征长度相差较大的三圆柱系统之间气动干扰现象进行精确模拟。结果表明:提出的流固耦合分析结果成功再现了风洞试验现象;在风速大于18m.s-1时,下游钢丝绳受到的流体作用变得明显,体现出其改变拉索-灯具系统截面形式的作用,从而在机理上较好地解释驰振力的形成过程,验证了该方法的正确性,并可供类似研究参考。
In order to propose a fluid-solid coupling analysis method to simulate and analyze wind-induced vibration, the flow field of the cable-lighting system is simplified to a three-cylinder serial model with relative attack angle. The system vibration model Simplify as mass-spring-damping system, using SST turbulence model, combined with specially designed meshing technology, using ANSYS CFX software and User Fortran tools to develop structural dynamics analysis program, between the characteristics of the larger difference between the three cylinder system Pneumatic interference phenomenon for accurate simulation. The results show that the proposed fluid-structure coupling analysis successfully reproduces the wind tunnel test phenomenon. When the wind speed is greater than 18m · s-1, the fluid effect on the downstream steel wire rope becomes obvious, which shows that it changes the cross-sectional form of the cable- So as to explain the formation process of the galloping force in a mechanistic way, which verifies the correctness of the method and is available for reference for similar research.