横向流激励下绳索的扩张和回转运动

基于横向流激励下绳索的微段受力分析,建立了横向流体对绳索作用力的解析表达.借助坐标变换,将绳索的运动表示为扩张和回转两部分.在此基础上,分析了小垂跨比绳索的流激振动问题,对无伸张态临界流速、平衡解稳定性、重力对绳索运动的影响等问题进行了讨论.

Stretch and Rotation of a Suspended Cable Subject to Transverse Fluid Excitation

On the basis of analysis of the fluid drag acting on a suspended cable subjected to transverse fluid excitation, an expression is established for the fluid forces applied on the cable. By using a coordinate transform, the equations of motion of the cable are simplified into those in terms of the stretch and rotation coordinates. In the case of small ratio of sag_to_span, a study is made on the fluid_induced vibration behavior of the cable, including the critical fluid flow speed, the stability of equilibrium position, as well as the influences of gravitational parameter on the cable dynamics.