Controle ativo de vibrações em uma estrutura com 2 GDL utilizando transdutores piezoelétricos associados a circuitos Shunt de capacitância negativa.

Abstract

The need for control or suppression of vibrations arose due to its harmful effects caused at people, structures and machine elements. With the passage of years, various control techniques were created and develop as technology advance. Today, the use of functional or smart materials is already used on a large scale in practical applications and in academic research of the world's largest technology centers. In this work, our goal is to perform vibration control of a structure with two degrees of freedom portico type using piezoelectric transducers associated with the negative capacitance shunt circuits with electric resistance in series. To do this, we use an electroelectronics circuit with passive components (resistors, capacitors, inductors) associated with piezoelectric transducers QP10W, to produce the negative capacitance shunt circuit, implemented through Negative Impedance Converters (NIC) using operational amplifiers. Response amplitudes of the system in the domains of time and frequency were analyzed in free vibration and forced vibration using the resistors that had the best performance in energy dissipation structure, which were the 100 Ω and 150 kΩ. We obtained a reduction of 9.01 dB for the first peak frequency and 6.95 dB for the second peak in vibration free. In the case of forced vibration, we obtained a reduction of 1.5 dB for the first peak frequency and 2.19 dB for the second peak frequency, thus fulfilling the purpose of the intended work.