Abstract
A novel piezoelectric vibration energy harvesting system is proposed whose harvesting performance could be significantly enhanced by introducing one or multiple additional piezoelectric elements placed between two nearby oscillators. A parameter study of a multiple degree of freedom (MDOF) piezoelectric vibration energy harvester (PVEH) system has been conducted to provide a guideline for tuning its harvesting bandwidth and optimizing its design. Based on the analysis method of the two degree of freedom (DOF) piezoelectric vibration harvester system as illustrated in Chapter 6, a generalized MDOF PVEH with multiple pieces of piezoelectric elements inserted between two nearby oscillators is studied. The harvested power of the PVEHs of 1–5 DOF has been compared while the total mass and the mass ratio of oscillators are kept as constants. It is found that more DOF of PVEH with more additional piezoelectric elements inserted between two nearby oscillators would enable to harvest more energy. The first mode resonant frequency will be shifted to the low-frequency range when the numbers of DOF increase.
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