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Vibration signal analysis of automobiles based on nonstationary spectrum

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4 Author(s)
Fukasawa, A. ; Commun. Syst. Lab., OKI Electric, Tokyo, Japan ; Takizawa, Y. ; Oda, K. ; Sato, T.

This paper describes an analysis method and its application to prognosis and diagnosis of automobiles based on nonstationary spectral estimation. An instantaneous frequency spectrum is considered first at a single point of time based on the instantaneous representation of autocorrelation. A kinetic model is introduced into spectral time-variations. The instantaneous maximum entropy method (IMEM) is used for the nonstationary spectral estimation of vibration and acoustic sound signals of automobiles. A two-dimensional (2-D) space is composed based on the variables which are obtained by the IMEM. Position, velocity, and acceleration vectors are calculated for state points on the above 2-D space. A new space is composed by axes of position and acceleration vectors. The proposed method was confirmed useful to implement automatic supervising for automobile engine operations

Published in:

Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on

Date of Conference:

15-19 Nov 1993