S053023 A Study on Perforation Depth Estimation of Concrete Material Using Abrasive Water Jet

Abstract

Abrasive water jet being excellent cutting performance, the cutting, perforating and chipping of several construction material such concrete and metal were applied. However, more effective method measured perforation and cut depth in real time have not been developed yet. In order to estimate a perforation depth on concrete material in real time using abrasive water jet, the resonance propagation model in perforating hole and the model of frequency vortex generation due to inverse jet on the hole edge were analyzed and investigated in experiments. Measuring the sound pressure level around the water jet and perforated depth by water jet exactly, the resonance frequency of acoustic impedance in perforation depth and that of vortex generation concerned with Strouhal number was found to correspond to the peak frequency of sound pressure. From those results, these two analysis model was related interactively, and analyzing the resonance frequency of measured sound only, the perforation depth on the concrete material was able to estimate in real time.