Author(s)

A. BeUaak & J. Flšaker

Abstract

The influences of various defects of a single-stage gear-unit upon the vibrations they produce are dealt with. Different methods are applied to analyse time signals obtained by experiments. Significant changes in tooth stiffness are caused by a fatigue crack in the tooth root. This leads to a dynamic response which differs from the one in concern to an undamaged tooth. A time signal of a helical single-stage gear-unit has been obtained by means of accelometers and then prepared for further analyses. Statistical methods for analysis are most frequently applied for time signal. Amplitudes of time signal are, by frequency analysis, presented as a function of frequencies f. Digital frequency analysis has been carried out by means of Fourier Fast Transformation (FFT) and Time Frequency Analysis (STFT), which demands sampling of time signal

Keywords