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oai:www.ideals.illinois.edu:2142/78640 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Vakakis, Alexander F. Vakakis, Alexander F. Bergman, Lawrence A. McFarland, Donald M. Alleyne, Andrew G. Quinn, Dane D. Remick, Kevin R. 2015-07-22T22:33:39Z 2015-07-22T22:33:39Z 2017-07-23T09:15:17Z 2015-05 2015-04-24 In this thesis, a vibration-based energy harvesting system utilizing essential (nonlinearizable) nonlinearities and various electromechanical coupling elements is investigated. These elements include electromagnetic and piezoelectric methods of energy conversion. The mechanical system of interest consists of a grounded, weakly damped linear oscillator (primary system) subjected impulsive loading. This primary system is coupled to a lightweight, damped oscillating attachment (nonlinear energy sink, NES) via a thin wire, which generates an essential geometric cubic sti ness nonlinearity. Various electromechanical coupling elements are included within the oscillator coupling in various con gurations depending on the system being studied. Under single or repeated impulsive input, the damped dynamics of this system exhibit transient resonance captures (TRCs) causing large-amplitude, high-frequency instabilities in the response of the NES. These TRCs result in strong energy transfer from the directly excited primary system to the light-weight attachment. The energy is harvested by the electromechanical elements in the coupling and, in this present case, dissipated across a resistive element in the electrical circuit. The primary goal of this work is to numerically, analytically, and experimentally demonstrate the e cacy of employing this type of high-frequency dynamic instability to achieve enhanced vibration energy harvesting under single or repeated impulsive excitation. Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-05-01 The student, Kevin Remick, accepted the attached license on 2015-04-20 at 18:50. The student, Kevin Remick, submitted this Dissertation for approval on 2015-04-20 at 19:10. This Dissertation was approved for publication on 2015-04-24 at 13:57. DSpace SAF Submission Ingestion Package generated from Vireo submission #7967 on 2015-07-22 at 14:18:22 Made available in DSpace on 2015-07-22T22:33:39Z (GMT). No. of bitstreams: 2 REMICK-DISSERTATION-2015.pdf: 15081743 bytes, checksum: 18691e696d1d3da18abbfef5447f1797 (MD5) LICENSE.txt: 4209 bytes, checksum: d3ea0e8eb4eed6800a673d9e8de9934c (MD5) Previous issue date: 2015-04-24 Embargo set by: Seth Robbins for item 79881 Lift date: 2017-07-22T22:34:16Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system U of I Only Restriction Lifted for Item 79881 on 2017-07-23T09:15:17Z. application/pdf http://hdl.handle.net/2142/78640 en Copyright 2015 Kevin R. Remick Strong nonlinearity Impulsive excitation Electromechanical coupling Nonlinear vibration energy harvesting by intentional excitation of high-frequency dynamical instability text text 2015-5 Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.