Tuning, power and efficiency of piezoelectric vibration energy harvesters

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Through an impedance plot obtained from the equivalent circuit modeling of linear energy harvesters, this paper provides explanations of their system behaviors such as power and efficiency. The impedance plot shows the tuning impedance and the matched source impedance in the same graph, providing a visualization of their relationship as the system parameters are changed or tuned. Using this relationship, the power characteristics of the system are clearly explained. In addition, the impedance plot is connected to the structural effects in stiffness and damping due to energy harvesting. Two types of efficiency are defined in terms of the electrically induced damping: the energy conversion efficiency and conventional energy efficiency. By using the impedance plot, it is shown that the maximum power and maximum efficiency are achieved almost simultaneously for weakly coupled systems. However, for strongly coupled systems, they cannot be achieved at the same time due to the significant reduction in structural energy associated with high efficiency. Though many relationships discussed in this paper are reasonably understood in the research community, a deeper and more direct understanding of these relationships are offered by this paper with the aid of this graphical and intuitive approach.

Original languageEnglish (US)
Title of host publicationActive and Passive Smart Structures and Integrated Systems XII
EditorsAlper Erturk
ISBN (Electronic)9781510625891
StatePublished - Jan 1 2019
EventActive and Passive Smart Structures and Integrated Systems XII 2019 - Denver, United States
Duration: Mar 4 2019Mar 7 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceActive and Passive Smart Structures and Integrated Systems XII 2019
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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