Eventos Anais de eventos
DINAME 2017
XVII International Symposium on Dynamic Problems of Mechanics
Use of Piezoelectric Materials in Energy Harvesting Systems as Sensors and Actuators
Submission Author:
Aline Souza de Paula , DF
Co-Authors:
Aline Souza de Paula, Marcelo Savi, WESCLEY BARBOSA, Tiago Leite Pereira , Adriano Todorovic Fabro
Presenter: Aline Souza de Paula
doi://10.26678/ABCM.DINAME2017.DIN17-0000
Abstract
This work exploits the idea of using piezoelectric materials as sensors and actuators in energy harvesting systems. The main objective of these systems is the vibration-based energy harvesting where available mechanical energy is converted into electrical energy. In this regard, piezoelectric materials are employed to establish a mechanical-electrical conversion. The harvested energy from harmonically excited linear system achieves its best performance when it is excited in its fundamental resonance. If the excitation frequency is changed slightly, the power output is drastically reduced. Thus, there are research efforts focused on the concept of broadband energy harvesting to overcome this drawback. An interesting alternative is to explore nonlinear bistable energy converters. The search for broadband energy harvesters includes harmonic and randomly excited system. This paper deals with energy harvesting using a bistable nonlinear piezomagnetoelastic structure. Initially, random vibrations are investigated and a condition for energy harvesting enhancement is established. Afterward, the same structure is analyzed under harmonic and random excitations. The goal is to present an investigation of the best electrical output response of the system. It is proposed a methodology to evaluate the system performance when both harmonic and random excitations are considered together. Finally, the use of piezoelectric materials as sensors and actuators is incorporated in the system considering the structure subjected to harmonic excitation. The actuator is considered for control purposes, exploiting chaos control techniques with two different goals: vibration reduction, where vibration amplitudes should be reduced; and energy harvesting, where large amplitude responses are exploited to generate energy. In both situations, chaos control is simultaneously employed with vibration energy harvesting. Both control actuation and energy harvesting are induced employing piezoelectric materials. In the case of vibration reduction, the goal is that the controller can use the harvested energy. In the case of energy harvesting, the control is used to obtain a better performance of the device.
Keywords
Piezoelectric materials, energy harvesting, Chaos Control, Sensors, actuators
