I wish figures were hyperlinked to their larger size versions; figure 2 which is an important one to understand is unreadable; same problems with figure 5, and 7.
I did like the authors' tripartite approach the energy harvesting and utilization problem.
Surely, the approach can be extended to multiple spring mass systems; such an ensemble has the advantage of not needing fine tuning to optimize a system as long as the bounds of the dominant resonant frequencies are known.
FYI, Stephane Boisseau and Ghislain Despesse at the CEA-Leti (France) also contributed the article, entitled: "Energy harvesting, wireless sensor networks & opportunities for industrial applications".
The link to the article is: http://www.eetimes.com/design/smart-energy-design/4237022/Energy-harvesting--wireless-sensor-networks---opportunities-for-industrial-applications
Click on the link below to check out the collection of the Design Articles, Case Studies, Product How-To articles, Teardowns, etc... related to energy scavenging that have been published on Smart Energy Designline.
Click here: http://www.eetimes.com/design/smart-energy-design/4372778/Energy-harvesting---Design-archive
Check back frequently. The list will be updated as new articles arrive.
@anne-francoise.pele; I appreciate the follow up and the links (& the larger versions of figures in the article!).
The need for cost-effective energy harvesting sensor nodes can not be overstated and is critical to deploying sensor networks for infrastructure monitoring.