Development of piezoelectric energy-harvesting tuned mass damper
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Tuned mass dampers (TMDs) are one of the most widely used devices to mitigate vibrations in structures. Usually, in conventional TMDs, viscous dampers convert the energy of vibration into heat. A new type of TMDs, called regenerative TMDs, has been developed. Energy transducers either are coupled to traditional TMDs or replace the dampers. Instead of being dissipated as heat, energy of vibration is now converted into electricity. This paper describes a regenerative TMD using piezoelectricity regenerative components as energy transducers. This piezoelectric energy-harvesting TMD (PETMD) is designed to mitigate vertical vibration as with conventional TMDs, while harvesting energy as a power resource for immediate use or storage. The system design and general design strategy of the PETMD are described, outlining the manner in which the vibration control performs its functions efficiently. The piezoelectric regenerative component is then configured and optimized by finite element analysis to maximize the power generation capacity. Finally, a small prototype is constructed to confirm the results from analysis. An energy of 80 μW was harvested from the prototype when excited by harmonic forces of about 2 N at 5 Hz and coupled to a resistor of 9.9 kΩ.
Keywordspiezoelectric tuned mass damper regenerative vibration control energy harvesting
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