Research Article
Separation Method of Impulsive Fault Component for Gasoline Engine Based on Acoustic Signal Analysis
Figure 3
Principle of the preliminary selection of the starting point. (a) W areas include the main energy area of two fault components. (b) W areas do not contain the main energy area of two fault components. Correlation analysis for W1 and W2 areas intercepted at the same phase of two consecutive q revolutions. If the W1 and W2 areas include the main energy area of two fault components, where ρ(W1, W2) is greater than threshold M1, then the starting point is preliminarily selected at the phase position. If the W1 and W2 areas contain background noise or few fault features, where ρ(W1, W2) is less than M1, then the starting point should be reverified at the next phase.
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