Modeling of rain-wind induced vibrations

摘要

In this paper mathematical models for the simulation of rain-wind induced vibrations are presented. The aerodynamic instability of cables caused by rain rivulets on the cable surface can be simulated by a two-dimensional three-mass-oscillator with four degrees of freedom using quasi-steady strip theory. This basic model is enhanced by investigations on a cable in 3-D space. In addition the behaviour of the rivulets is examined more detailed by numerical simulation using simplified Navier-Stokes equations. The presented models are capable of describing the behaviour and dependencies of the vibrations. The simulated cable oscillations as well as the movements of the two rivulets agree with in-situ observations and wind tunnel tests.