Energy scavenging and wave manipulation in linear and nonlinear dynamical systems

This dissertation presents results in two broad, inter-related areas . The first three chapters deal with modeling and analysis of electro -mechanical vibratory systems and harvesting ambient oscillatory energy . The final three chapters present results for manipulating elastic and sound waves in periodic lattices. Chapter 1 presents a novel result concerning the rattleback which is an ellipsoidal toy with some curious proper- ties . When placed on a surface, the rattleback has a preferred direction of spin - if spun in the opposite direction, it will reverse itself. This phenomenon has been termed spin reversal and the effect is attributed to the asym- metry between the inertia and geometry axes of the top . In this work, results are presented demonstrating that the rattleback, when placed on a vibrating platform, will start to spontaneously spin (in its preferred direction) . Based on a simple linearization for small angular velocities, we derive an expression for the resonant frequency. A simple electromagnetic energy harvester is proposed consisting of a magnetized rattleback surrounded by mag- netic coils is proposed and the possible transduced electric power is evaluated.

Grantor dc:publisher

State University of New York at Buffalo

Year dc:date.issued

2018

Author dc:creator

• Nanda, Aditya; 0000-0002-6220-5250

Contributors dc:contributor

• Karami, Amin
• Mechanical and Aerospace Engineering

• mechanical engineering

Statement dc:rights

• Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.
• Copyright retained by author.

Language dc:language

eng

Handle dc:identifier

http://hdl.handle.net/10477/78050

OAI record oai:identifier

https://ubir.buffalo.edu/oai/request?verb=GetRecord&metadataPrefix=qdc&identifier=oai%3Aubir.buffalo.edu%3A10477%2F78050