PZT AND PVDF USED IN CONTROL OF VIBRATION AND NOISE SOUND

Naor Moraes Melo¹

¹ UFPB

doi:10.20906/CPS/COB-2015-0138

Resumo

Piezoelectric materials is one the class of structural material that exhibit a deformation in response to application of an electric field, and produce a dielectric charge in response to mechanical deformation of the material. These materials can be used as important agents in the active control for determination of strain or deformation (effect sensor) or to act as a controller structures (effect actuator). These materials have been widely used in control systems for detection and suppression of vibration (Brennan, Pinnington and Elliot, 1995). The advantage of piezoelectric elements is their use in vibration control and noise control in the audible frequencies (Melo, 2004); principally, when if know the location of faults at the structure. The variation from the strain tensor for piezo ceramic material in the piezoelectric under the action of a constant load is less than 12% for temperatures up to 120 º C (Carvalhal, 2005). Due to the nature ceramics, PZTs have good stiffness and when pasted by special part incorporates the resistance of the base structure, which results in an excellent conversion of electrical energy into mechanical. The materials piezoceramic, they has advantageous in many applications although to present difficulties due to their fragility and brittle in the molds in complex shapes. One option for these complex structures is the use of PVDF film, because they have a consistency of a plastic sheet and can be affixed to virtually any geometry. They have high sensibility and accuracy in measurements as sensors. This work explained a studying from the characteristics of PZT and PVDF films, acting as sensors and actuators to mechanical vibrations. With further the use in vibration control and the consequences in the structure.

Palavras-chave: PZT; PVDF; Active Control; Vibration