Bispectral analysis of the cutting process

The dynamics of three different cutting regimes were compared using the bicoherence estimates. For two regimes corresponding to cutting with strong and weak chatter, several significant interactions between spectral components are found, suggesting the presence of quadratic type nonlinearities in the dynamics of chatter. By contrast, the dynamics of the chatter-free cutting as the third regime, reflect almost no such interactions. The bicoherence analysis on simultaneously measured time series of three orthogonal components of the main cutting force showed that practically the same information is contained in all three of them