Details

Autor(en) / Beteiligte

• Pan, Jianan
• Qin, Weiyang
• Deng, Wangzheng
• Zhang, Pengtian
• Zhou, Zhiyong

Titel

Harvesting weak vibration energy by integrating piezoelectric inverted beam and pendulum

Ist Teil von

• Energy (Oxford), 2021-07, Vol.227, p.120374, Article 120374

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

ScienceDirect

Beschreibungen/Notizen

• Scavenging energy from weak ambient vibration is significant for powering wireless sensors and transducers. To harvest more energy from weak vibration, we proposed a rigid-elastic energy harvester composed of an inverted piezoelectric beam and a pendulum (IPBP). The finite element model was established, and corresponding simulations were performed. The results prove that the IPBP could exhibit different nonlinear characteristics at different resonance frequencies. Then, the experimental study was conducted. The experimental results are in good agreement with the simulation predictions. Furthermore, it is found that there exists mode coupling in the IPBP, by which the excitation at high frequency could excite the response at low frequency. Mode coupling is beneficial for the IPBP to trigger snap-through motion under weak excitation. The experiment proves that under stochastic excitation, the IPBP could execute snap-through motion through mode coupling and thus generate a large electrical output. This study may provide a new method to improve the harvesting performance of weak excitation. •A rigid-elastic harvester is proposed to harvest weak vibration energy.•The electromechanical equations are derived and solved.•The device shows hardening or softening feature at different resonance frequencies.•Experiment proves that mode coupling could generate large amplitude and output.•The device could promote the electric output for weak stochastic excitations.