Analysis and Application of Dynamic Spectrum of Friction-Induced Noise

Dynamic spectrum was applied to analysis of friction-induced noises. The result indicates that a dynamic spectrum contains rich information about time-variation, frequency spectrum structure and dynamic range of friction-induced noises. Experiments prove that dynamic spectrum is very sensitive to the change of operating parameters of equipment and can be applied to monitoring and fault diagnosis for equipment under operation. The average gray-scale of dynamic spectrum was selected as a fault sensitivity factor, and their quantification procedures were introduced.