Separation Method of Impulsive Fault Component for Gasoline Engine Based on Acoustic Signal Analysis

Table 1

Length of the main energy areas of engine fault components and mechanical faults found in other studies.

Serial number	Failure type	Sampling rate	Main peak area length
1	Fuel injection advance angle fault [6]	48 kHz	Approximately 180
2	Enlarged clearance case for cylinder intake valve and exhaust valve [12]	25.6 kHz	Approximately 45
3	Cylinder misfire fault [25]	44.1 kHz	Approximately 150
4	Abraded connecting rod bearing shell faults [25]	44.1 kHz	Approximately 150
5	Bolt loosening faults [25]	44.1 kHz	Approximately 100
6	Roller bearing with outer race fault [26]	12 kHz	Approximately 40
7	Bearing with inner race defect [27]	12 kHz	Approximately 40
8	Piston slap noise [28]	25.6 kHz	Approximately 120
9	Combustion chamber knock [29]	100 kHz	Approximately 200
10	Wear of crankshaft bearing [30]	12.8 kHz	Approximately 70