Fluid-Induced Nonlinear Dynamic Tensioning of Cables

摘要

The long-term goal of this research is to identify the dominant mechanisms that control the dynamic tension in submerged cables. This goal addresses the need to suppress or alleviate the dynamic component of cable tension that may adversely affect the performance of underwater cables and any mission they are used to support. For instance, large dynamic tension forces may degrade the positioning and performance of instruments attached to cable suspensions; may adversely affect the stationkeeping of ocean structures and vessels; and may promote cable fatigue, fretting, and wear. This research will provide a fundamental understanding of the dynamic tensioning mechanisms that exist in cables that are suspended in a surrounding fluid. This understanding will follow from two research thrusts that focus on two broad classes of cable- fluid interaction. Thrust I concerns cables immersed in a quiescent fluid (no mean flow) in which the fluid interaction is dominated by inertial and dissipative forces. Thrust II concerns the resonant, vortex-induced vibration of cables subjected to a cross flow.