Next Article in Journal
Perspective of Sustainable Rural Tourism in the United Kingdom of Great Britain and Northern Ireland (UK): Comparative Study of β and σ Convergence in the Economic Development Regions
Next Article in Special Issue
Offshore Wind and Wave Energy Assessment around Malè and Magoodhoo Island (Maldives)
Previous Article in Journal
Analysis of the Barriers to Widespread Adoption of Electric Vehicles in Shenzhen China
Previous Article in Special Issue
A Helicopter View of the Special Issue on Wave Energy Converters
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Sustainability 2017, 9(4), 523; doi:10.3390/su9040523

Numerical Modeling and 3D Investigation of INWAVE Device

1
Department of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
2
INGINE Inc., Changdo Building, 395-2 Cheonho-daero, Dongdaemun-Gu, Seoul 03722, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Diego Vicinanza and Mariano Buccino
Received: 18 February 2017 / Revised: 25 March 2017 / Accepted: 27 March 2017 / Published: 30 March 2017
(This article belongs to the Special Issue Wave Energy Converters)
View Full-Text   |   Download PDF [1247 KB, uploaded 31 March 2017]   |  

Abstract

In this article, numerical studies on a tightly moored point absorber type wave energy converter called INWAVE are presented. This system consists of a buoy, subsea pulleys, and a power take off (PTO) module. The buoy is moored by three ropes that pass through the subsea pulleys to the PTO module. Owing to the counterweight in the PTO module, a constant tension, which provides a horizontal restoring force to the buoy, is constantly applied to the rope. As waves pass by, the buoy is subjected to six degrees of freedom motion, consisting of surge, heave, sway, roll, pitch, and yaw, which causes reciprocating motion in the three mooring ropes. The PTO module converts the motion of the ropes into electric power. This process is expressed as a dynamic equation based on Newtonian mechanics and the performance of the device is analyzed using time domain simulation. We introduce the concept of virtual torsion spring in order to prevent the impact error in the ratchet gear modules which convert bidirectional motion of rope drum into unidirectional rotary motion. The three-dimensional geometrical relationship between the ropes and the buoy is investigated, and the effects of the angle of the mooring rope and the direction of wave propagation are addressed to determine the interaction between the tension of the rope and the buoy. Results have shown that the mooring rope angle has a large impact on the power extraction. The simulation results present a useful starting point for future experimental work. View Full-Text
Keywords: wave energy converter; point absorber; in-shore installation; capture width ratio; tight-moored buoy wave energy converter; point absorber; in-shore installation; capture width ratio; tight-moored buoy
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Song, S.K.; Sung, Y.J.; Park, J.B. Numerical Modeling and 3D Investigation of INWAVE Device. Sustainability 2017, 9, 523.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top