Drill fracture detection by the discrete wavelet transform

This paper describes the use of induction motor current to detect the occur rence of drill fracture based on the discrete wavelet transform. The scalin g and shifting coefficients in the discrete wavelet transform are chosen as powers of two so that a multi-level signal decomposition of the induction motor current can be performed. Different wavelets are also considered in o rder to recognize drill fracture clearly. Experimental results have indicat ed that drill fracture can be detected successfully by this approach. (C) 2 000 Elsevier Science S.A. All rights reserved.