COUPLED IN-LINE AND TRANSVERSE FLOW-INDUCED STRUCTURAL VIBRATION - HIGHER-ORDER HARMONIC SOLUTIONS

Coupling of in-line and transverse flow-induced vibration can be signi ficant in several structural engineering applications. In this study, a particular model already proposed in the literature is adopted. The relevant equations of this model feature nonlinearities and coupling b etween the two components of motion. The level of coupling depends on the relative properties of the flow and the structure. A harmonic bala nce technique is used to obtain an equivalent coupled system of linear equations. Higher order harmonics can be readily treated, yielding a quite general formulation which can be tailored to match the available computational resources. A parametric study is conducted using the pr oposed technique, and insight regarding the significance of the coupli ng of the two components of motion on the overall structural response is obtained. The proposed technique is applicable to any other refined model of coupling of in-line and transverse flow-induced vibration wh ich may become available based on theoretical or experimental fluid me chanics developments.