Aplicação de cerâmica piezoelétrica do tipo Niobato de Potássio e Sódio (KNN) como sensor de vibrações em viga

Abstract

In the present work, the Potassium Sodium Niobate ceramic was used as a sensor for the study of vibrations in beams. In this sense, the main objective of this study was to develop the KNN ceramic through the mechanical process and, then, apply a piezoelectric wafer of this material as a vibration sensor coupled to a free-standing beam. The beam is modeled via the spectral element method considering an Euler Bernoulli element. The natural frequencies of the beam are obtained from the Frequency Response Function (FRF). Vibration tests are performed and then natural frequencies obtained experimentally. Ceramic synthesis is performed by mixing oxides and stands out for being low cost and highly efficient. The results of the characterizations present data similar to the literature, concluding that there was the formation of the KNN phase. With the accomplishment of the experiment, the responses presented by the material developed when compared with commercial accelerometer are remarkable, concluding then, its applicability as a sensor for detecting vibrations in structures.