المجلة الدولية للعلوم والتقنية

The aim of this paper is to introduce Fast Fourier's technique to analyze the vibration signal of a gearbox, when it is on good condition and after malfunctioning. It was observed that the amplitude of the vibration signal in the time domain increased with the failure, but it is difficult to diagnose the fault directly. When using the Fourier technique, the amplitude of the related frequency - mesh frequency - was clearly observed and the side frequenciesshowed a fault in the gears. Fast Fourier's is a quick and easy technique, it is a good indicator of detection and diagnosis of faults in the gears. Keywords:Condition monitoring, vibration analysis, Fast Fourier technique.