研究目的
Improving operational bandwidth of an energy harvesting system using flexible piezoelectric devices (FPEDs) connected by springs.
研究成果
The operational bandwidth of an energy harvesting system can be improved by increasing the number of FPEDs with small differences in natural frequencies. Attaching springs increases maximum output voltage and decreases the natural frequency of the system. A hard spring with a tuned mass is preferable for improving maximum output power with minimal changes in natural frequency.
研究不足
The study is limited by the specific configurations of FPEDs and springs used, and the theoretical model's assumptions may not capture all real-world complexities.
1：Experimental Design and Method Selection:
The study uses a theoretical method based on beam theory, electromechanical coupling, and the transfer matrix method for calculating displacement and voltage responses.
2：Sample Selection and Data Sources:
FPEDs excited by a shaker are used, with their responses measured.
3：List of Experimental Equipment and Materials:
FPEDs, springs, a shaker, an accelerometer, a laser displacement sensor, and a voltmeter are used.
4：Experimental Procedures and Operational Workflow:
The excitation frequency is swept across a range using increments of 1 Hz, maintaining constant acceleration of the base.
5：Data Analysis Methods:
A fast Fourier transform is applied to time series data to obtain the frequency response function.
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