Energy harvesting from walking motion of a humanoid robot using a piezoelectric composite

Youngsu Cha, Seokmin Hong

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


In this paper, we investigate the energy harvesting of a piezoelectric composite in a knee pad during walking motion. We use a humanoid robot as a test bed for the experiments using the knee pad. The humanoid wears the knee pad hosting the piezoelectric composite, and its operating knee motion mimics the walking based on the data captured from a human. The use of the humanoid enables the motion to be completely repeatable. We quantitatively study the energy harvesting by using the repeated motion. An electromechanical model for the piezoelectric energy harvester is used to estimate power transferred to varied load resistances under the repeated knee motion. With a good agreement between the experiments and the model predictions, we demonstrate power harvesting on the order of ten microWatts.

Original languageEnglish
Article number10LT01
JournalSmart Materials and Structures
Issue number10
Publication statusPublished - 2016 Sept 7
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the KIST flagship program (Project No. 2E26460). The authors would like to thank Mr Youngbin Hyun for his help with the experiments.

Publisher Copyright:
© 2016 IOP Publishing Ltd.


  • energy harvesting
  • humanoid robot
  • piezoelectric material
  • walking motion

ASJC Scopus subject areas

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering


Dive into the research topics of 'Energy harvesting from walking motion of a humanoid robot using a piezoelectric composite'. Together they form a unique fingerprint.

Cite this