Author(s): Karel Jan, Monhart František
The paper describes a non-destructive diagnostic method primarily intended for large rotating machines and transformers. The method is based on the assumption that the emitted noise is characteristic of the mechanical condition of the machine concerned. On the theoretical side, subject to analysis have been the electric machine noise sources and their mathematical description. In practical situations, the noise signals are picked from sound field of the machine. The paper includes typical noise spectra recorded and irregularities found in selected operational environments, where the results of the noise diagnostics are compared to those attainable by the conventional vibration measurement method. Finally, a critical review of the strong points and weak spots of noise diagnostics is presented, as well as the prospects for practical utilisation of the method based on noise measurement and analysis.
Name: Mr Jan Karel
Country: Czech Republic