Analysis of acoustic emission emerging during hydroabrasive cutting and options for indirect quality control

Abstract

The paper discusses connections of acoustic emission in abrasive water jet cutting. Introduction focuses on theoretical knowledge on this technology and offers analysis related to current state of the art of the problem research. Further description of performed experiments is presented in case in which acoustic emission behaviour was observed with the exactly scheduled change of cutting conditions or rather cutting head traverse speed v. The beginning of the initial part contains FFT spectral analyses and comparison of the examined sections of the experimental samples. Consequently a graphical representation and comparison of peak-to-peak values (maximal amplitudes) and values of AERMS at the time of experimental cutting follow. At the close of the work, the analyses are expressed as dependence on the cutting head traverse speed v with expressed regulation equations applicable in the close-loop control process with minimum human intervention and in case of fault conditions—broken focusing tube, fractured water nozzle.