Table of Contents
Smart Materials Research
Volume 2017 (2017), Article ID 6084309, 23 pages
https://doi.org/10.1155/2017/6084309
Research Article

Multiresonant Frequency Piezoelectric Energy Harvesters Integrated with High Sensitivity Piezoelectric Accelerometer for Bridge Health Monitoring Applications

1Department of Electronics and Instrumentation Engineering, NPMASS MEMS Design Centre, Annamalai University, Annamalai Nagar 608002, India
2Department of Civil and Structural Engineering, Annamalai University, Annamalai Nagar 608002, India

Correspondence should be addressed to Joseph Daniel Rathnam

Received 20 July 2016; Revised 18 October 2016; Accepted 24 October 2016; Published 29 January 2017

Academic Editor: Yong Liu

Copyright © 2017 Prathish Raaja Bhaskaran 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

Wireless Structural Health Monitoring (WSHM) is a less expensive but efficient mode of health monitoring. However, it needs frequent change of batteries since remote WSHM consumes large power. The best scientific solution to this problem is to employ energy harvesters integrated along with the vibration sensors in the same substrate so that the battery is recharged by the energy harvested during vibrations caused by the passing vehicles in bridges. In this work, an attempt has been made to design an energy harvester and a micro accelerometer integrated chip. Civil structures have low natural frequencies and therefore low bandwidth design is adopted to maximize the harvested energy and accelerometer sensitivity. The other special feature of the proposed design is its ability to provide further increase in energy harvesting by the parallel operation of an array of energy harvesters with closely spaced natural frequencies. The studies show that the natural frequencies of the harvesters should be less than that of the structure in healthy condition. Simulation studies conducted on these devices show that it is possible to harvest a maximum power of 2.283 mW/g. The integrated micro accelerometer is also capable of giving a sensitivity of 27.67 V/g with appreciable improvement in other performance indices.