A compact mechanical power take-off for wave energy converters: Design, analysis, and test verification

Li, Xiaofan; Chen, ChienAn; Li, Qiaofeng; Xu, Lin; Liang, Changwei; Ngo, Khai; Parker, Robert G.; Zuo, Lei

doi:10.1016/j.apenergy.2020.115459

A compact mechanical power take-off for wave energy converters: Design, analysis, and test verification

Journal Article · Tue Aug 11 00:00:00 EDT 2020 · Applied Energy

DOI:https://doi.org/10.1016/j.apenergy.2020.115459· OSTI ID:1659133

Li, Xiaofan ^[1]; Chen, ChienAn ^[2]; Li, Qiaofeng ^[2]; Xu, Lin ^[2]; Liang, Changwei ^[2]; Ngo, Khai ^[2]; Parker, Robert G. ^[3]; Zuo, Lei ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Virginia Tech
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Univ. of Utah, Salt Lake City, UT (United States)

Power Take-off (PTO) is one of the most critical components in the ocean wave conversion. This paper introduces an innovative compact mechanical PTO using a ball screw mechanism and a Mechanical Motion Rectifier (MMR) to improve the energy conversion performance. The proposed MMR PTO converts bidirectional oscillatory motion of the ocean waves into unidirectional rotation. The detailed design and working principle of the MMR PTO are explicitly explained. Dynamic analysis is presented for the three most important factors that influence the performance, including the equivalent mass, the equivalent damping, and the excitation frequency. The analytical relationship between these factors and the disengaged freewheeling motion caused by the MMR mechanism is derived, and the analytical solution is verified through dry lab testing. Experimental results in bench tests show that compared with the traditional linear PTO which use the ball screw to drive the generator directly, the MMR PTO is more efficient because of the unique freewheeling motion, achieving a maximum 81.2% energy transfer efficiency. After integrating the prototype PTO with a single-body point absorber type of wave energy converter, testing in a water tank yields total PTO efficiency up to 62.4%, showing a very promising potential for real applications.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office

Grant/Contract Number:: EE0007174

OSTI ID:: 1659133

Alternate ID(s):: OSTI ID: 1647127

Journal Information:: Applied Energy, Journal Name: Applied Energy Vol. 278; ISSN 0306-2619

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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