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27 March 2012Modeling and experiment of a multiple-DOF piezoelectric energy harvester
Vibration energy harvesters have been usually designed as single-degree-of-freedom (1DOF) systems. The fact that such
harvesters are only efficient near sole resonance limits their applicability in frequency-variant and random vibration
scenarios. In this paper, a novel multiple-DOF piezoelectric energy harvester model (PEHM) is developed, which
comprises a primary mass and n parasitic masses. The parasitic masses are independent of each other but attached to the
primary mass. The piezoelectric element is placed between the primary mass and the base for energy generation. First, a
2DOF model is analyzed and characterized. Through parametric analysis, it is found that with a slight increase of the
overall weight to the original 1DOF harvester (without parasitic masses), two close and effective peaks or one effective
peak with significantly enhanced magnitude can be achieved in the power response. Subsequently, the 2DOF model is
generalized to an n-DOF model and its analytical solution is derived. This solution provides a convenient tool for
parametric study and design of a multiple-DOF piezoelectric energy harvester (PEH). Useful multimodal energy
harvesting can be achieved with a slight increase of the overall weight. Finally, a prototype of the proposed multiple-
DOF model is devised for proof of concept.
Lihua Tang,Yaowen Yang, andHao Wu
"Modeling and experiment of a multiple-DOF piezoelectric energy harvester", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83411E (27 March 2012); https://doi.org/10.1117/12.914764
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Lihua Tang, Yaowen Yang, Hao Wu, "Modeling and experiment of a multiple-DOF piezoelectric energy harvester," Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83411E (27 March 2012); https://doi.org/10.1117/12.914764