When machining the AE signals may be generated from many sources such as for example, workpiece/tool friction, chip formation, as well as other. In theory each of the sources may give its own AE signal portrait. The AE signal maybe in the form of AE bursts or continuous noise. In case of waterjet it probalby be a continuous noise. There several AE signal generation models but no one of them is fully adopted. In case of machining a great deal of work has been done by David Alan Dornfeld from California University. Google his papers.

thanks for suggestion i will read those papers and i get back to you

dear Udayagiri Goutham, I wonder about the outcome of this endeavor, one the one Hand because of what Sergei wrote and also for the material removal, respectively the surface integrity because of machining itself. In abrasive waterjet machining you want to apply a fluid Jet with sufficient energy that the material cannot stopp or alter the Jet too much in order to achieve good cutting edge Quality. As Sergei pointed out, the Jet machine pump will Transfer a Major AE burst Signal right with the Jet itself. The Change of the Signal depends, assumingly to a large extent, on the material to be cut (brittle or ductile soft or tough) and the material removal process. In brittle materials micro fracture and crack formation generate their own additional AE signals. In ductile and tough materials like TiAl6V4 the abrasives are dragged along with the waterjet and perform some Level of ductile material removal as it can be seen at the cut surfaces of the specimens. This may cause some changes (damping) in the AE Signal, I can imagine. From this I suppose empirical , mateial specific equations could work to some degree. However I wonder about the contribution of the AE Signal to surface (residual) stresses? Or do you intend to determine in-process stresses? Please Keep us informed about your Progress. Regards, R. rentsch