Community Research and Development Information Service - CORDIS

Modelling float pump systems

A wave power converter based on a float connected to a single working piston pump placed on the sea bed has been studied. In order to design such a system it is essential to have a model that is able to predict the motions of the float, the forces and angles of excursion in large waves.

Key aspects of the system have been modelled and the assumptions and simplification relating to hydrodynamics have been considered. Also, the areas needing further attention have been noted. The research involved work on differential equations for describing the system and numerical methods used in the computerized solving of the nonlinear mathematical equations. The model can provide time series of float motion, wire forces and power production. Measurements of the wire forces in regular waves were compared to numerical time domain simulations.

An experimental procedure has been developed. Average absorbed hydraulic power in different sea states are presented in terms of a semiempirical relation between the float diameter and the significant wave height. Increased energy absorption by implementing control are expected. Areas for future development for the numerical model and its application to related device types have been identified.

Reported by

Danish Wave Power ApS
Koebenhavn
Denmark
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