Wideband Non-Linear Piezoelectric Vibration Energy Harvesting

Wan Hashim, Wan Ahmad Faiz (2019) Wideband Non-Linear Piezoelectric Vibration Energy Harvesting. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) Wideband Non-Linear Piezoelectric Vibration Energy Harvesting.pdf - Submitted Version Download (735kB)

Abstract

Kinetic energy exists in the form of vibrations, forces and any random displacements. Harvesting the kinetic energy is needed in order to generate electricity and prevent it to be wasted. Energy harvesting can be defined as processes that capture the freely available energy in environment and converting it in electrical energy that can be used or stored. Piezoelectric is used to convert mechanical energy to electrical energy. Piezoelectric produces charge when piezoelectric material compressed or mechanically stressed. Basically, energy harvesters are designed as a linear system in order to achieve optimal performance but most ambient energy is sensitive and having different frequency. Due to that, the linear energy harvesters need to tune for every application in order to prevent from narrow bandwidth. To solve this problem, a non-linear mechanism is suggested, which is wider bandwidth can be obtained in one mechanism. In addition, by using non-linear energy harvesting, it able to produce wider bandwidth without any adjustment. A non-linear energy harvester is designed as a cantilever beam with mechanical stopper at upper and bottom side of the beam. The piezoelectric is attached on the beam so that it will deflect along with the beam. The aim of this mechanism is to provide a wider bandwidth with maximum power harvested. The experimental results for the linear and non-linear device are obtained by using quasi-static and dynamic measurement. The quasi-static measurement is used to measure the restoring force against the deflection of beam. Meanwhile, dynamic measurement is used to measure the dynamic response for characterisation of the device. The performance of open circuit and closed circuit of system are also investigated. The system is varied by changing the length of the beam, position of the stopper and input level

Actions (login required)

View Item