This Thesis examines the experimental and theoretical lateral vibration characteristics of flexible (rubber) cylinder clusters, subjected to axial incompressible (water) flow, within a rigid circular containment channel. The cylinders, some of which were instrumented with embedded strain gages, were clamped at both their upstream and downstream ends, to streamlined rigid fin assemblies.; The theory is a random vibration model, with cylinder deflections based on natural beam mode summation, and response dependent on both the effects of the mean flow along the cylinders, and of turbulent boundary layer pressure fluctuations.; Various bundles with different numbers of cylinders, as well as with combinations of flexible and rigid cylinders, were investigated, both experimentally and theoretically. It is shown that the theory is in excellent qualitative agreement with experiments, in terms of power spectral densities, and coherences and phases between cylinders; nevertheless, predicted amplitude levels are one order of magnitude higher than those measured.
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