Fault Diagnosis for Hydraulic Servo System Using Compressed Random Subspace Based ReliefF

Table 1

Fault injection scheme.

Fault mode	Fault phenomenon	Fault injection mode
Normal state	-	-
Electronic amplifier fault	Magnification notably increases	Multiplying the gain by 0.25
Sensor fault	Constant gain	Setting the feedback of the sensor to 0.5
Hydraulic wear fault	Output flow decreases	Setting flow-pressure coefficient of the variable orifice valve to 0.03