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A Self-Reacting Point Absorber With a Novel Mechanical Motion Rectifier as Power Takeoff System

[+] Author Affiliations
Changwei Liang, Junxiao Ai

Stony Brook University, Stony Brook, NY

Lei Zuo

Stony Brook University, Stony Brook, NYVirginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. DSCC2014-6292, pp. V002T32A004; 6 pages
  • ASME 2014 Dynamic Systems and Control Conference
  • Volume 2: Dynamic Modeling and Diagnostics in Biomedical Systems; Dynamics and Control of Wind Energy Systems; Vehicle Energy Management Optimization; Energy Storage, Optimization; Transportation and Grid Applications; Estimation and Identification Methods, Tracking, Detection, Alternative Propulsion Systems; Ground and Space Vehicle Dynamics; Intelligent Transportation Systems and Control; Energy Harvesting; Modeling and Control for Thermo-Fluid Applications, IC Engines, Manufacturing
  • San Antonio, Texas, USA, October 22–24, 2014
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4619-3
  • Copyright © 2014 by ASME


A two-body self-reacting point absorber is proposed in this paper. This two body system is designed as a floating buoy and a bottom sphere. The energy is harvested through the relative motion between these two bodies. A mechanical motion rectifier (MMR) is used as the power takeoff (PTO) system. The PTO system will experience engagement and disengagement under wave excitation. Due to this nonlinearity, a time domain model is developed. The influences of the PTO parameters such as the equivalent inertia mass and equivalent damping on the absorbed power are obtained in regular waves. The system parameters were chosen to maximize the absorbed power. The performance of this device in irregular waves was also investigated.

Copyright © 2014 by ASME



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