Output from Linear Generator for VIV-driven Buoys
SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
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A derivation of a non-dimensionalized math model was presented for predicting oscillation frequencies of a submerged tethered buoy. The model included a prediction of the buoy excitation frequencies due to vortex shedding. To match this excitation frequency with buoy natural frequencies, this model included coupling effects of an internal pendulum and added mass of the buoy, but excluded viscous damping. This model did not include coupling of the buoy motion on the vortex shedding frequencies. This report also presents a linear generator system that could be used internally in an upright buoy to produce power. Simple power tests were conducted using machine and manual actuation of the magnets. Future work on this project will include 1 laboratory and field testing to validate the VIV oscillation model, 2 a possible adjustment of the model to include a coupling effect of buoy motion with vortex shedding as well as viscous damping, and 3 incorporation of a generator into a buoy design to validate power output predictions. The effects of the generator on the model will the then be included.
- Marine Engineering