Experimental Studies and New Feature Extractions of MBN for Stress Measurement on Rail Tracks

The paper reports the design and implementation of magnetic Barkhausen noise (MBN) systems as well as its application and experiments for stress measurement on the rail track. Features of MBN signals including root mean square, average amplitude and pulse counts are calculated and analyzed, and a new feature the ratio of peak value and width at half maximum is introduced. All of these features of MBN signal decreases with the increase of compressive stress, but the feature of the ratio of peak value and width at half maximum has the fastest rate of decreasing against compressing stress which means that it has better sensitivity in stress measurement.