Numerical and Experimental Analyses on Motion Responses on Heaving Point Absorbers Connected to Large Semi-Submersibles

Kyong-Hwan Kim,Sewan Park,Jeong-Rok Kim,Il-Hyoung Cho,Keyyong Hong

doi:10.3390/pr9081363

Abstract

This study considers the motion responses of heaving point absorbers (HPAs) connected to large semi-submersibles. To analyze the motion responses for HPAs, a motion response amplitude operator (RAO) of a single HPA connected to a fixed wall was obtained in a two-dimensional wave flume. A frequency-domain eigenvalue analysis is used to evaluate the motion RAO of a single HPA, and the experimental and numerical results of motion RAO were compared. A model test was conducted to analyze the motions of multiple HPAs connected to a large semi-submersible in a 3D ocean basin. The motion RAOs of the multiple HPAs connected to the large semi-submersible were compared with the motion RAO of the single HPA connected to the fixed wall.

Highlights

With the increase in global warming, research on renewable energy sources is accelerating worldwide
This study focuses on the motion responses of the heaving point absorbers (HPAs) used in the project
The motion response for a single HPA moving along a wall-mounted guide was measured using a 1/10 scale water tank model test and validated with the numerical results of the matched eigenfunction expansion method (MEEM) analysis

Summary

Introduction

With the increase in global warming, research on renewable energy sources is accelerating worldwide. Since the past 10 years, demand for renewable power supply has been increasing rapidly, especially wind and solar power supplies. The combination of wave power and offshore wind power can generate more energy in a confined space; this is called hybrid power generation. These systems have the advantage of combining multiwave energy converters (HPAs) with wind turbines (WTs), which can enhance the energy yield, share the common grid and substructure, obtain smooth power output, and share operation and maintenance. The merits of combining wave and offshore wind and recent research trends are summarized in [1]

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Results

Conclusion