Experimental and Numerical Testing of a Multi-Modular Floating Structure with Varying Connection Stiffness

Abstract

This work is a step towards conceptualizing a smart multi-modular structure, whose main application is solar energy harvest, with the innovative idea of connectors that can be controlled to mitigate motions and loads in a changing environment. The paper presents selected preliminary results from experimental tests of an array of floating column-based modules exposed to regular waves of different periods. Each pair of neighboring modules was connected by two spring connectors with both tension and compression stiffness. The paper presents an investigation of motion responses versus load frequencies corresponding to four tested spring stiffnesses.The model test results serve as a basis for validating a numerical model that is implemented for control design and simulation purposes. Wave-, mooring- and connector forces are considered in the simulations. The proposed method will act as a tool for further evaluation of the effect of changing the connection stiffness according to the incoming waves and the investigation of whether it is beneficial to apply a smart connector that can adapt to varying sea states.