Characteristics of acoustic emission signal due to diamond grit scratching on oxygen free copper and its time series modeling

The acoustic emission characteristics of a single diamond grit scratching on oxygen free copper with different scratch depths are studied by experiments. The AE signals are pre-processed to become stabilized and to determine appropriate time series model order and model identification. The Auto Regressive (AR) model for the AE time series signals generated by a single diamond grit scratching on oxygen free copper is established. The results show that the AE characteristic parameters and maximum amplitude increase with the increase of scratching depth. There is a good linear relationship between the characteristic vector of the AR model and the scratching depth. The AE signal characteristics of different scratching depths can be well represented by the rational time series AR model. The scratching depth of the single diamond grit can also be real-time analyzed by the AR model.