Sea wave energy is being increasingly regarded in many countries as a major and promising resource. The paper deals with the development of wave energy utilization since the 1970s. Several topics are addressed: the characterization of the wave energy resource; theoretical background, with especial relevance to hydrodynamics of wave energy absorption and control; how a large range of devices kept being proposed and studied, and how such devices can be organized into classes; the conception, design, model-testing, construction and deployment into real sea of prototypes; and the development of specific equipment (air and water turbines, high-pressure hydraulics, linear electrical generators) and mooring systems.

Wave energy utilization: A review of the technologies

Oscillating-water-column wave energy converters and air turbines: A review

One of the most abundant energy sources exists in this world is the ocean wave energy. By far, it has shown to be the most clean, renewable, predicted energy and has raised the potential to compete with the current use of non-renewable energy sources. Recent research conducted on wave energy invention has opened a new dimension to slowly reduce the dependency on fossil fuel by introducing new technology on the renewable world but relatively lacking in economical aspect. This review brings the latest status on integration of wave energy device with other marine facilities, which is the breakwater structure that may possibly aid to cost sharing. Most researches done on this field highlighted countries experiencing rough sea condition and focused less on countries with medium wave condition as faced by the Asian continent. The potential for energy extraction and wave dissipation for medium wave condition will be discussed in this review by considering several aspects including reliability, effectiveness and performance. Finally, this review shows that the integration opens up a new dimension to acknowledge the technology harnessing ocean wave, especially for the Asian countries experiencing medium wave condition.

Wave energy device and breakwater integration: A review

Current status of self rectifying air turbines for wave energy conversion

Wave energy is substantial as a resource, and its potential to significantly contribute to the existing energy mix has been identified. However, the commercial utilization of wave energy is still very low. This paper reviewed the background of wave energy harvesting technology, its evolution, and the present status of the industry. By covering the theoretical formulations, wave resource characterization methods, hydrodynamics of wave interaction with the wave energy converter, and the power take-off and electrical systems, different challenges were identified and discussed. Solutions were suggested while discussing the challenges in order to increase awareness and investment in wave energy industry as a whole.

https://www.mdpi.com/1996-1073/11/5/1250/pdf

Ocean Wave Energy Converters: Status and Challenges

PROBLEM TO BE SOLVED: To provide a method for constructing a large-sized floating body structure wherein the large-sized floating body structure can be constructed by positioning and connecting segments in an installation sea area without influenced by waves. SOLUTION: After mooring and installing a floating breakwater 20 in the installation area of the large-sized floating body structure 10 with a captive wire 30, the segment A is moored to the floating breakwater 20 through a positioning connection wire 61 and the segment 12B is connected to the moored and positioned segment 12A in order. Thus, the large-sized floating body structure 10 can be constructed in a calm area formed by the floating breakwater 20.

Method for constructing large-sized floating body structure

A Study on Examination of an Estimation Method for Slow Drift Oscillation Amplitude Based on the Results of Open Sea Tests of Offshore Floating Type Wave Devise“Mighty Whale”

Teruhisa Ogata

Papers

Method for constructing large-sized floating body structure

A Study on Examination of an Estimation Method for Slow Drift Oscillation Amplitude Based on the Results of Open Sea Tests of Offshore Floating Type Wave Devise“Mighty Whale”