Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Energy Harvesting from Chaotic Vibration
Submission Author:
Luã Guedes Costa , RJ
Co-Authors:
Luã Guedes Costa, Eduardo Villela Machado dos Reis, Marcelo Savi
Presenter: Luã Guedes Costa
doi://10.26678/ABCM.COBEM2021.COB2021-0404
Abstract
Recent developments in technology requires the employment of self-powered sensors, actuators and small electronic devices. Energy harvesting systems are useful to this goal and can be configured in many different ways to improve process efficiency. The energy converted can also be stored to be further consumed. Mechanical vibration is one of the energy sources that can be converted into electrical energy. Besides the energy harvested, it is possible to mitigate undesirable vibrations. Smart materials are usually employed in these systems in order to promote electro-mechanical converstion. Piezoelectric materials is one kind of smart material that find several applications in industry. Nonlinear characteristics are usually exploited in order to enhance energy harvesting capacity. In this regard, multistable energy potential is usually exploited by adding magnetic interactions to the system. Duffing oscillator can be employed to describe the two-well potential behavior related to magnetic interactions. In this regard, nonlinear dynamics analysis is essential for a proper design of the energy harvesting system. Due to intrinsic nonlinear behavior, complex responses are expected including chaos. Therefore, an important issue to be investigated is the correlation between energy harvesting capacity and the kind of response. Therefore, nonlinear tools need to be employed for a deep dynamical analysis. This paper addresses the correlation between the maximum Lyapunov exponent and power harvesting parameters in order to define harvesting capacity. Output RMS power and the efficiency of the conversion are some power harvesting parameters investigated. The degree of chaoticity, represented by the value of Lyapunov exponents, is connected with the electro-mechanical conversion efficiency.
Keywords
energy harvesting, nonlinear vibration, chaos, Lyapunov Exponents, bistable systems
