Nonstationary spectral analysis method and its application to turbocharger of automobile engine

摘要

This paper describes an analysis method of nonstationary spectrumbased on a modulation model. A nonstationary signal is represented by atransfer function with modulated process. Furthermore, a new spectralaxis is brought to describe the nonstationarity of spectral variation.The authors proposed the instantaneous maximum entropy method (IMEM).The proposed algorithm has been applied to analyze vibration signals ofthe turbo charger in an automobile engine. The results of analysis bythe proposed method give useful information on the delicate differencesof observed signals