Process harmonics often need to be eliminated for accurate regenerative chatter diagnosis. To eliminate the with many band-stop characteristics, this paper uses a periodic/aperiodic separation filter (PASF) and proposes detection algorithm based on PASF. The PASF can design cutoff frequency time constant, directly, high-order improves elimination performance without deteriorating signal extract...

The vibration acceleration time history of the cutter holder was separated into three parts; namely, chatter free, transition and chatter processes. The reconstructed attractor and probability distribution of vibration acceleration time series were studied in order to observe the system’s behavior. The Lyapunov exponent andKolmogorov entropy were used to help judge the cutting state. Meanwhile,...

Survival in natural environments for small animals such as rats often depends on precise neural coding of life-threatening acoustic signals, and binaural unmasking of species-specific pain calls is especially critical. This study investigated how species-specific tail-pain chatter is represented in the rat amygdala, which receives afferents from both auditory thalamus and auditory association c...