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Journal of Sensors
Volume 2016, Article ID 2353517, 12 pages
http://dx.doi.org/10.1155/2016/2353517
Research Article

Piezoelectric Wind Energy Harvesting from Self-Excited Vibration of Square Cylinder

1College of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan 450002, China
2Jiangsu Engineering Research Center on Meteorological Energy Using and Control, Nanjing University of Information Science & Technology, Nanjing 210000, China
3Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education of China, Chongqing 400044, China
4College of Engineering, South China Agricultural University, Guangzhou, Guangdong 510642, China
5School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
6Shipping and Marine Engineering College, Chongqing Jiao Tong University, Chongqing 40074, China
7Power Engineering School, Chongqing University, Chongqing 400044, China

Received 4 January 2016; Revised 27 April 2016; Accepted 8 May 2016

Academic Editor: Chengkuo Lee

Copyright © 2016 Junlei Wang et al. 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.

Abstract

Self-excited vibration of a square cylinder has been considered as an effective way in harvesting piezoelectric wind energy. In present work, both of the vortex-induced vibration and unstable galloping phenomenon process are investigated in a reduced velocity () range of with load resistance ranging in  MΩ. The vortex-induced vibration covers presynchronization, synchronization, and postsynchronization branches. An aeroelectromechanical model is given to describe the coupling of the dynamic equation of the fluid-structure interaction and the equation of Gauss law. The effects of load resistance are investigated in both the open-circuit and close-circuit system by a linear analysis, which covers the parameters of the transverse displacement, aerodynamic force, output voltage, and harvested power utilized to measure the efficiency of the system. The highest level of the transverse displacement and the maximum value of harvested power of synchronization branch during the vortex-induced vibration and galloping are obtained. The results show that the large-amplitude galloping at high wind speeds can generate energy. Additionally, energy can be harvested by utilization of the lock-in phenomenon of vortex-induced vibration under low wind speed.