Abstract
The dynamic response of a submerged CETO shaped quasi-point absorbing wave energy converter coupled to a bistable power take off is presented in this study. Whilst the impact of bistability has been shown in a limited number of situations to improve the amount of power generated, many models have been restricted to a single degree of freedom and often ignore drag effects. To overcome these model limitations, a submerged single tether point absorber with a bistable power take off was modelled using both 1 and 3 degrees of freedom. The device was subjected to regular waves and included a simple model of viscous drag. The bistable mechanism was provided by a magnetic dipole model quantified by a dimensionless parameter applicable to any bistable system. The performance of the device was is assessed by the theoretical power generated. Over each model, the previously observed benefit of bistability was not consistently obtained. Simulations of regular waves demonstrated an increase in generated power for suboptimal conditions for some frequencies, while a reduction in generated power was observed in optimal conditions. The performance increase showed strong correlation to the phase relationship between the motion and exciting forces as a result of bistability.
Highlights
O CEAN wave energy has been the subject of over two centuries of research according to [1]
This is likely due to the phase altering property and the geometric nonlinear coupling between degree of freedom (DOF). Overall this did not improve the time-averaged power. This finding further supports the assumption that heave is the DOF most closely associated with power production for a single tether point absorber (PA) wave energy converters (WEC)
Bistable mechanics within the context of irregular waves should be considered as the passive phase matching property seen in the 1-DOF sub-optimal condition could be effective in irregular conditions
Summary
O CEAN wave energy has been the subject of over two centuries of research according to [1]. Over this time many individual designs have been proposed with differing modes of operation. A number of typical wave energy converters (WEC) are discussed in [2] and can be broadly classed as one of three types: an attenuator, a point absorber (PA), or a terminator. While the simple operation of a generic PA WEC is well known, there remains many challenges for wave energy, as identified in [3]. Areas in which further work is required before commercialisation are: materials and manufacture; fluid dynamics and hydrodynamics; survivability and reliability; environmental resources; devices and arrays; power conversion and control; infrastructure and grid connection; marine operations
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