Bandwidth enhancement of piezoelectric based vibration energy harvester using magnetic oscillators /
In recent years, utilizing kinetic energy in mechanical vibrations has become an interesting area of research. This is due to ubiquitous sources of vibration energy, coupled with the ever increasing demands to power wireless sensing electronics and Microelectromechanical (MEM) devices with low energ...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur :
Kulliyyah of Engineering, International Islamic University Malaysia,
2015
|
| Subjects: | |
| Online Access: | http://studentrepo.iium.edu.my/handle/123456789/4367 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In recent years, utilizing kinetic energy in mechanical vibrations has become an interesting area of research. This is due to ubiquitous sources of vibration energy, coupled with the ever increasing demands to power wireless sensing electronics and Microelectromechanical (MEM) devices with low energy requirements. Thus, researchers have ventured into developing different system configurations with the aim of harvesting vibration energy to power these devices. Cantilever beam systems with piezoelectric layer have been used as vibration energy scavengers due to their abilities to convert kinetic energy in vibrating bodies into electrical energy. However, the challenge is to develop energy harvesters that can produce a reasonable amount of energy at a wider frequency bandwidth. In this research, piezoelectric energy harvester (PEH) beams with magnetic oscillators is proposed and developed to address the issue. With macro fiber composite (MFC) as the piezoelectric transducer, mathematical models of different system configurations having magnetic couplings are derived based on continuum based model of a continuous system to study the dynamics of the harvesters. Simulations of the system dynamics are done using numerical integration technique in MATLAB software to study the influence of magnetic interactions in generating power due to based excitations for low frequency range between (0-100 Hz). From the simulation results of the configurations, cantilever harvesters with fixed magnetic coupling yield lower power output compared to conventional energy harvester without a magnet. However when wider frequency bandwidth is considered, harvesters with magnetic coupling have much wider bandwidth. By analyzing the performance of PEH with magnetic oscillators in different orientations (i.e. attractive and repulsive), the simulation results reveal that, a peak power output of 3.263mW and 4.14mW are achieved when attractive and repulsive orientations of coupled magnets are considered at 2m/s2 acceleration level. Also, frequency bandwidth of 8Hz and 6Hz are obtained at different orientations as opposed to 1.44mW power and 4Hz bandwidth for the conventional PEH. The experiments were conducted by using the Dynamic Signal Analyzer (DSA) to acquire the signals of the harvesters as a transfer function of the voltage output to the input acceleration. At all values of distance considered between the oscillator and the harvester (15 – 27) mm, an improvement in peak magnitude of the output voltage is achieved from 17.59V/g to 24.99V/g. Moreover, the frequency bandwidth of the proposed system is increased from 1.8Hz to 1.9Hz at 21mm distance. The results show better performance of the proposed systems over the existing conventional PEH in terms of magnitude of the voltage output as well as the frequency bandwidth. Hence, by implementing the said configurations, the generated energy can effectively serves as power supply for remote sensing application. |
|---|---|
| Physical Description: | xviii, 128 leaves : ill. ; 30cm. |
| Bibliography: | Includes bibliographical references (leave 117-122). |