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Vibration-Based Energy Harvesting
| Title: | Vibration-Based Energy Harvesting |
| Author: | Triplett, Angela L. |
| Description: | Advances in electronic and consumer technology are increasing the need for smaller, more efficient energy sources. Thus vibration-based energy harvest- ing, the scavenging of energy from existing ambient vibration sources and its conversion to useful electrical power, is becoming an increasingly attractive alternative to traditional power sources such as batteries. Energy harvest- ing devices have been developed based on a number of electro-mechanical coupling mechanisms and their design must be optimized to produce the maximum output for given environmental conditions. While the role of non- linearities in the components has been shown to be significant in terms of the overall device efficiency, few studies have systematically investigated their in- fluence on the system performance. Crawley and Anderson (1990) provided experimental evidence that a linear model for the piezoelectric coupling co- efficient was not valid when large strains were applied. This was again seen in the work of du Toit (2005), who modeled and designed a MEMS piezo- electric vibration energy harvester. He noticed that his model, based on linear constitutive relations for the piezoelectric material, consistently under- predicted the experimental voltage produced from his device. Therefore, this thesis concentrates on the effects of nonlinear piezoelectric coupling models on the power output of an electromechanical energy harvester. An analytical study of a one-dimensional mechanical attachment was conducted using a Poincar ́e-Lindstedt perturbation analysis, including the effects of nonlinear- ities in both the stiffness and the electro-mechanical coupling. The response was then compared against numerical simulations of the original system, fo- cusing on the relationship between the power generated by the device, the ambient vibration characteristics, and the nonlinearities in the system |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1226614650
http://hdl.handle.net/2374.OX/103494 |
| Date: | 2008 |
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