Induced vibrations are three-dimensional oscillations in a structure, whereby maximum amplitude is mostly perpendicular to sustained action. In this paper, we discuss the specific physics for how induced-vibrations evolve with space and time in a few example structures. We demonstrate how a sustained action (particularly fluid drag and gravity loading) rotates and reshapes these slender structures. We demonstrate how this then shifts and expands the dynamic nature of the structure, making the structure more receptive to vibrational inducements of any kind. Contrary to historical focus, the structure (not the fluid) primarily determines the physical nature of any induced vibrations, including fluid-induced vibrations.

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