Chatter detection based on wavelet coherence functions in micro-end-milling processes

Yanjie Yuan, Xiubing Jing*, Huaizhong Li, Kornel F. Ehmann, Dawei Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Micro-end-milling is used for the fabrication of complex geometrical features with high precision on a wide variety of materials. One of the main challenges is related to chatter vibrations, which are detrimental to the productivity and overall quality of the manufactured parts. In this article, a novel chatter-detection method based on wavelet coherence functions is proposed to evaluate the stability of the micro-end-milling process. Then, the method is experimentally tested under different cutting conditions. The results show that the wavelet coherence functions of two orthogonal acceleration signals are sensitive enough and applicable for chatter detection. When chatter occurs, the two orthogonal acceleration signals are highly correlated at the chatter frequency, resulting in a sharp increase in the magnitude of the wavelet coherence functions to values approaching unity.

Original languageEnglish (US)
Pages (from-to)1934-1945
Number of pages12
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Issue number9
StatePublished - Jul 1 2019


  • Chatter detection
  • acceleration
  • micro-end-milling
  • wavelet coherence
  • wavelet cross spectrum

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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