研究目的
Investigating the use of piezoelectric nonlinear energy sink (NES) for energy harvesting from ambient vibrations to improve performance over a broad frequency range.
研究成果
The NES based piezoelectric vibration energy harvester (PVEH) improves energy conversion efficiency with a relatively weak vibration of the primary structure. A trade-off between power output and working bandwidth is revealed from the perspective of selecting electromechanical coupling and load resistance.
研究不足
The study focuses on harmonic excitation and a standard rectifying DC interface circuit. The performance under other types of excitation or more complex interface circuits is not explored.
1：Experimental Design and Method Selection:
The study employs a piezoelectric nonlinear energy sink (NES) for energy harvesting, using a standard rectifying direct current (DC) interface circuit. Harmonic balance method is used for dynamic response and energy harvesting performance analysis, verified by equivalent circuit simulation.
2：Sample Selection and Data Sources:
The system parameters are identified from preliminary experiments.
3：List of Experimental Equipment and Materials:
Piezoelectric beam (Volture V21BL), full-wave rectifier (4 diodes), filter capacitor Cf, and load resistance R.
4：Experimental Procedures and Operational Workflow:
Sinusoidal frequency sweep with a constant acceleration amplitude is conducted to obtain frequency responses. The effects of load resistance, electromechanical coupling, and excitation on the DC power output are studied.
5：Data Analysis Methods:
Newton-Raphson harmonic balance method (NHBM) and equivalent circuit simulation in SIMetrix based on the derived ECM.
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