Lift-Oscillator Model of Vortex-Induced Vibration

by ROnald T. Hartlen, Defense Res. Establishment Atlantic; Defense Res. Board, Nova Scotia, Canada,
Iain G. Currie, Assoc. Prof.; Dept of Mech. Engrg., Univ. of Toronto, Toronto, Ontario, Canada,

Serial Information: Journal of the Engineering Mechanics Division, 1970, Vol. 96, Issue 5, Pg. 577-591

Document Type: Journal Paper


The main feature is the representation of fluctuating lift behavior in terms of a proposed wake-oscillator. The primary purpose of the paper is to demonstrate the potential of the wake-oscillator concept for future studies. The elastically mounted cylinder is modeled as a second-order, linear, damped system. The aerodynamic lift force is proportional to the instantaneous value of a fluctuating lift coefficient. The instantaneous lift coefficient is derived from the response of a proposed lift-oscillator, whose characteristics are deduced from existing experimental data. This oscillator is self-excited, its natural frequency is proportional to wind speed, and it is subjected to a coupling term proportional to the transverse cylinder velocity.

Subject Headings: Vortex shedding | Vibration | Cylinders | Wind speed | Elastic analysis | Linear functions | Damping | Aerodynamics

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