Mathematical Framework for Hydromechanical Time-Domain Simulation of Wave Energy Converters
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Author(s)
Brizzolara, S.
Seixas de Medeiros, Joao
Date Issued
January 2018
Journal
Mathematical Problems in Engineering
Publisher
Hindawi Publishing Corporation
Citation
Medeiros, J. Seixas de and Brizzolara, S. "Mathematical Framework for Hydromechanical Time-Domain Simulation of Wave Energy Converters." Mathematical Problems in Engineering 2018 (January 2018): 1710253 © 2018 The Author(s)
Version
Final published version
Abstract
Efficient design of wave energy converters based on floating body motion heavily depends on the capacity of the designer to accurately predict the device’s dynamics, which ultimately leads to the power extraction. We present a (quasi-nonlinear) time-domain hydromechanical dynamic model to simulate a particular type of pitch-resonant WEC which uses gyroscopes for power extraction. The dynamic model consists of a time-domain three-dimensional Rankine panel method coupled, during time integration, with a MATLAB algorithm that solves for the equations of the gyroscope and Power Take-Off (PTO). The former acts as a force block, calculating the forces due to the waves on the hull, which is then sent to the latter through TCP/IP, which couples the external dynamics and performs the time integration using a 4th-order Runge-Kutta method. The panel method, accounting for the gyroscope and PTO dynamics, is then used for the calculation of the optimal flywheel spin, PTO damping, and average power extracted, completing the basic design cycle of the WEC. The proposed numerical method framework is capable of considering virtually any type of nonlinear force (e.g., nonlinear wave loads) and it is applied and verified in the paper against the traditional frequency domain linear model. It proved to be a versatile tool to verify performance in resonant conditions.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1155/2018/1710253
