Politecnico di Torino | Servizi per la didattica

KEYWORD

Modelling and Dynamics of a Compressible Flap-like Variable-shape Wave Energy Converter

estero Thesis abroad

keywords CONTROL DESIGN, SIMULATION, AUTONOMOUS DRIVING, DYNAMIC ANALYSIS, DYNAMIC MODELLING, ENERGY HARVESTING, MODELLING, RENEWABLE ENERGY, SOFT MEMBRANES

Reference persons FABIO CARAPELLESE, GIULIANA MATTIAZZO

External reference persons Dr. Edoardo Pasta

Research Groups MOREnergy Lab

Thesis type NUMERICAL AND EXPERIMENTAL

Description Wave energy conversion is evolving, with recent advances focusing on devices that adapt their shape to maximize energy capture. Traditional wave energy converters (WECs) have fixed geometries, limiting efficiency in varying wave conditions. Variable-shape WECs offer a promising alternative by dynamically adjusting their form to align better with wave forces, improving power production without the need for costly reactive power systems. Studies show significant power capture improvements using flexible hulls and adaptable structures. This project, in collaboration with Iowa State University (USA), explores shape-changing WECs driven by internal hydraulic actuation.

This master’s thesis focuses on developing an analytical and numerical model of a compressible variable-shape flap for wave energy capture. The flap is inspired by soft robotics, particularly soft pneumatic network actuators (sPNAs) used in grippers. In this energy application, the flap, made from soft elastomeric material, compresses when impacted by waves, pushing air from one side to the other through an external pipe. This fluid flow can drive a PTO system for power extraction, with a Wells turbine being a potential solution. The key challenge lies in accurately modeling the nonlinear fluid-structure interaction, as the flap's shape continuously changes, affecting hydrodynamic forces and energy production estimates.

The candidate will use MATLAB/Simulink to develop an analytical model for the device's dynamics and apply numerical methods to approximate the hydrodynamic interactions. This approach will address the hydrodynamic behavior of flexible structures, updating the hydrodynamic parameters based on the flap's shape at each time step. The research will investigate how ocean waves and the device's actuation compress and decompress the hull, impacting its hydrodynamic properties and overall performance.

The project will involve an initial training phase at the Marine Offshore Renewable Energy (MOREnergy) Lab, followed by an approximately five to six-month (to be defined) research period at Iowa State University. There, the candidate will develop and refine the model, perform dynamic analyses, and assess the device’s energy conversion performance. Through this collaborative effort, the project aims to advance the understanding and application of variable-shape WECs in the field of renewable ocean energy.