Métodos tradicionais de análise de vibração em mancais de rolamento utilizando sinais FFT e de envelope em sistemas mecânicos rotativos

Abstract

The paper presents measurement vibration techniques on time domain, frequency and time-frequency that are used to detect defects in mechanical parts of rotary machines, like rolling element bearings, which make part of rotating equipment from the simplest to more complex ones. Defects in mechanical components are detected because it produces a series of vibration impact, which can be obtained by an accelerometer, but this vibration signal needs to be filtered through Fast Fourier Transform (FFT) that changes signal on time domain to frequency domain, it makes interpretation about signal information easier to be comprehended. Among techniques on frequency domain, envelope analysis is used to find resonance frequency, it is found using filtering methods through FFT and signal demodulation process to obtain the envelope of this, which allows identifying and locating the defect