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A common type of device for wave-energy extraction is an oscillating water column (OWC) with a compression chamber. Peak performance of most OWC systems occurs at resonance with the driving waves. At resonance, oscillations increase linearly in time until damping inhibits further growth. Parametric resonance is introduced as a means of exciting the oscillations of the water column. In parametric resonance, oscillations increase exponentially in time. The use of this kind of resonance may increase the performance of OWC systems. This type of resonance occurs when one of the parameters in an oscillator varies periodically. Asymptotic methods are used to study the nonlinear dynamics of an OWC with parametric resonance. These results are compared with those of a numerical model of a real experimental laboratory setup. http://www.ingentaconnect.com/content/klu/engi/2007/00000057/00000001/00009048
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