Fault Diagnosis of Electromechanical Actuator Based on VMD Multifractal Detrended Fluctuation Analysis and PNN

Table 1

The description of five working conditions.

Condition name	Position profile	Parameters	Load profile (load is in lbs)	Max. velocity (m/s)	Comments
Condition 1	Sine sweep	80 mm, 0.0625 Hz, 0.5 Hz	Constant at 0	0.08	Parameters represent amplitude and initial and final frequencies
Condition 2	Trapezoidal	40 mm, 22 s (1 + 1-second motion, 10 + 10-second hold)	Constant at −10	0.04	Parameters represent amplitude and time period of trapezoidal wave
Condition 3	Trapezoidal		Constant at 0	0.04
Condition 4	Trapezoidal	40 mm, 21 s (0.5 + 0.5-second motion, 10 + 10-second hold)	Constant at 0	0.08
Condition 5	Trapezoidal		Constant at 10	0.08