Signature analysis of mechanical watch movements by reassigned spectrogram

  • Authors:

  • S. Su;R. Du

  • Affiliations:

  • Institute of Precision Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong;Institute of Precision Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong

  • Venue:
  • ISPRA'07 Proceedings of the 6th WSEAS International Conference on Signal Processing, Robotics and Automation
  • Year:
  • 2007

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Abstract

This paper presents a study on the signature analysis of mechanical watch movements. Time-frequency analysis is proposed to analyze the time-frequency features of mechanical watch sounds so as to diagnose faults of mechanical watches. It is done by a combination of Reassigned Spectrogram (RSP) and Finite Element Analysis (FEA). The RSP possesses excellent time and frequency resolution and very few misleading interference fringes in mapping the signal into a 2D function of time and frequency. It reveals shocks at different time of the escapement mechanism. By comparing the frequency components at different shocks to the modal frequencies of components of the escapement, one can detect possible malfunctions of the movement. Time-frequency analysis works robustly as a complementary fault diagnosing method to time-domain analysis. Finally, a number of practical examples are included to reflect the applicability of the proposed method.