The acoustic signatures of cavitation erosion on grade DH36 steel

9th International Symposium on Cavitation

Armakolas, I.^1 ; Carlton, J.^1 ; Vidakovic, M.^1 ; Sun, T.^1 ; Grattan, K.T.V.^1

City University London, Northampton Square, EC1V 0HB, United Kingdom^1

关键词: Acoustic monitoring;    Acoustic Sensors;    Acoustic signals;    Acoustic signature;    City University;    Piezoelectric acoustic sensors;    Test rig configuration;    Threshold-value;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012109/pdf
DOI  :  10.1088/1742-6596/656/1/012109

来源: IOP

【 摘 要 】

Cavitation can cause considerable erosion to adjacent materials. Erosion is accompanied by acoustic emissions, related to crack formation and propagation inside the material. In this study a piezoelectric acoustic sensor mounted on the back of a grade DH36 steel plate is used to identify the acoustic signatures of cavitation. Cavitation is induced near the plate by means of an ultrasonic transducer (sonotrode). Various 'non-erosive' and erosive test rig configurations are examined and an acoustic threshold value for the onset of cavitation erosion is identified and presented. The use of a fibre Bragg grating (FBG)-based acoustic sensor developed at City University London for acoustic monitoring purposes is also examined. Acoustic signals from both sensors are analysed, by means of a fast Fourier transform, showing a very good agreement in terms of captured frequencies.