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Nonlinear beam-based vibration energy harvesters and load cells

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dc.contributor.advisor Alexander H. Slocum and Themistoklis P. Sapsis. en_US Kluger, Jocelyn Maxine en_US
dc.contributor.other Massachusetts Institute of Technology. Department of Mechanical Engineering. en_US 2014-06-13T22:36:33Z 2014-06-13T22:36:33Z 2014 en_US 2014 en_US
dc.description Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014. en_US
dc.description Cataloged from PDF version of thesis. en_US
dc.description Includes bibliographical references (pages 216-218). en_US
dc.description.abstract This thesis studies a novel nonlinear spring mechanism that is comprised of a cantilever wrapping around a curved surface as it deflects. Static force versus displacement tests and dynamic "initial displacement" tests verified the spring theory for a large range of oscillator parameters. Various human motion energy harvester configurations that use the nonlinear spring were numerically optimized for power, robustness, and adaptivity. Based on the optimization results, both the nonlinear and linear devices studied in this thesis generate more power per volume and per mass when excited at one's hip while walking than current commercial energy harvesters. The two degree-of-freedom (2DOF) nonlinear oscillator is more adaptive to different excitation signals and resistant to power decay when parasitic damping is present than the IDOF and 2DOF linear systems. These significant advantages are caused by the 2DOF nonlinear system harvesting its optimal power at large electromagnetic damping coefficients, whereas the optimal power generation for the linear systems occurs at low electromagnetic damping coefficients. This thesis also examined what electromagnetic damping coefficients can be generated by magnet-and-coil geometries that satisfy the energy harvester constraints. The final chapter of this thesis investigates a load cell that uses the stiffening spring to maintain high resolution over a large range of forces and prevent large forces from damaging the load cell. Future work will include testing a full energy harvester prototype and exploring other applications of the nonlinear spring. en_US
dc.description.statementofresponsibility by Jocelyn Maxine Kluger. en_US
dc.format.extent 218 pages en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.subject Mechanical Engineering. en_US
dc.title Nonlinear beam-based vibration energy harvesters and load cells en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Mechanical Engineering. en_US
dc.identifier.oclc 880676309 en_US

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