The relationships between the existence of gear teeth cracks as a cause and symptoms emerging as housing vibrations that can be detected with signals measured was investigated numerically and experimentally. Experimental measurements on one-stage gear drives have been carried out involving gears built in with different notch length in tooth root. Signals measured as accelerations on gear box house have been analysed with STFT. A new computer programme DSP_Studio has been developed for detecting and measuring the diagnostic signals, and simultaneously for analysing the effect of crack in tooth root. Numerical simulation model of simple gear pair, which incorporates simulation of crack presence in altered tooth stiffness, has been conducted to confirm experimentally obtained results. The experimental results corroborate with the numerical results. The results derived represent an important contribution to early crack detection on one-stage gear drives.
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