PVDF sensor based on-line mode coupling chatter detection in the boring process

Dynamic instability in the form of chatter vibrations during boring is detrimental to machining process. Therefore, an on-line chatter detection system is required to detect chatter before damage occurs. This paper evaluates a Polyvinylidene Fluoride (PVDF) piezoelectric thin-film based strain sensing system to detect mode coupling chatter in the boring process. In addition, this paper compares the performance of time domain based (autocorrelation), time-frequency based (wavelet transform), and frequency based (Fast Fourier Transform) methods for detecting mode coupling chatter. The PVDF sensor system is demonstrated to be a low-cost solution for detecting chatter in the boring process.