Vibrational energy harvesting using smart materials

• Main Author: Ang, Sabrina Shu Qin
• Other Authors: Yang Yaowen
• Format: Final Year Project
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Civil engineering::Structures and design
• Online Access: http://hdl.handle.net/10356/38545
• Institution: Nanyang Technological University

Vibration-based energy harvesting has rapidly advanced through the years, creating greater possibility of continuous and battery free power supply using the wireless electronics. In the recent years, smart materials have established their useful applications in harvesting of vibrational energy in the form of sensors and actuators. This is due to their intrusive nature and unique electro- mechanical coupling effect. To investigate this form of energy harvesting, the conventional cantilever beam configuration is involved, with smart materials bonded to the host structure. A comparison between three types of smart materials to attain the best harvesting material with the most power output will be explored, namely macro-fibre composites transducers (MFC), DuraAct A11 and A12. The scope of work is differentiated into structural and electrical aspects. In this study, the electrical aspects featuring harvesting circuits with storage capacitors will be emphasized. The first resonance frequency of the three smart materials will be experimentally derived through a circuit consisting of a 30mJ LED bulb, controlled by a control switch management module EH300A that limits the charging range from 1.8V to 3.6V. The charging time and total power harnessed from the three materials will be compared. To further enhance the harvesting system, geometric beam configurations with variations in the proof masses will test on their voltage output and charging efficiencies. Subsequently, using the optimal energy harvesting material in its best structural configuration option attained, a guideline for selection of various storage capacitors for different application use can be derived. A practical application of energy harvesting technology will be then be explored.