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The effect of forward and backward inclination on the characteristics of aerodynamic damping in inclined prisms is dissimilar to a vertical prism, and the characteristics have been discussed in terms of the unsteady aerodynamic force and Strouhal number in this study.
By contrast, the effect of the backward inclination on the vortex-induced vibration varies.
Two types of inclinations, i.e. forward inclination and backward inclination, were tested.
On the contrary, the backward inclination depresses the downwash, while enlarges the upwash.
As the backward inclination angle increases, the upwash evolves into an upward axial flow.
The responses of the cylinder with a small backward inclination are significantly larger, whereas the cylinder with a large backward inclination exhibits lower responses than those of the vertical case.
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Both aeroelastic tests and pressure measurements were performed on the cylinder with forward inclinations (inclined to the upwind direction), a vertical attitude, and backward inclinations (inclined to the downwind direction) in a wind tunnel.
Both aeroelastic tests and pressure measurements were performed on the cylinder with forward inclinations (inclined to the upwind direction), a vertical attitude and backward inclinations (inclined to the downwind direction).
Comparing aeroelastic galloping amplitudes with those predicted by the quasi-steady theory shows that the quasi-steady theory is applicable to predict the variation trend of the galloping behavior induced by both forward and backward inclinations, although it is unable to give accurate predictions on galloping amplitudes of all the inclined cylinders.
Therefore, these projections determine forward or backward inclinations.
Unlike the forward inclination case, not all the backward inclined cylinders oscillate at an amplitude smaller than the vertical cylinder does.
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