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Article
An empirical validation of a base-excitation model to predict harvestable energy from a suspended-load backpack system
Theoretical Issues in Ergonomics Science
  • Xu Xu, Harvard University
  • Simon M. Hsiang, North Carolina State University at Raleigh
  • Gary Mirka, Iowa State University
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
1-1-2010
DOI
http://dx.doi.org/10.1080/14639220903373839
Abstract
Suspended-load backpacks have been proposed as a way to provide power for small electronic devices by capturing the mechanical energy generated by the vertical movement of the suspended load and converting it into electrical energy. The aim of the current study was to build a base excitation model able to predict the relative velocity of the load (an index of the amount of harvestable energy of such a system) using as inputs the mass of the suspended load, the walking speed and the leg length of the user. Nine human participants walked on a treadmill under two load conditions (15.8 kg and 22.6 kg load) and three walking speed conditions (1.16 m/s, 1.43 m/s and 1.70 m/s). The predictions of the load velocity by the base-excitation model under these conditions were then compared with the measured load velocity. The results of this study showed a moderately strong correlation (0.76) between the root mean square of the predicted and measured relative velocity of the load, and the average absolute error of these predictions was 24.2%. These results provide support for the utility of this approach and also provide motivation for further refinement of the base excitation model for the prediction of the amount of energy able to be harvested from suspended-load backpack systems.
Comments

This is a manuscript of an article published as Xu, X., S. Hsiang, and G. Mirka. "An empirical validation of a base-excitation model to predict harvestable energy from a suspended-load backpack system." Theoretical Issues in Ergonomics Science 11, no. 6 (2010): 546-560. doi:10.1080/14639220903373839. Posted with permission

Copyright Owner
Taylor & Francis
Language
en
File Format
application/pdf
Citation Information
Xu Xu, Simon M. Hsiang and Gary Mirka. "An empirical validation of a base-excitation model to predict harvestable energy from a suspended-load backpack system" Theoretical Issues in Ergonomics Science Vol. 11 Iss. 6 (2010) p. 546 - 560
Available at: http://works.bepress.com/gary_mirka/17/