Axial Piston Pump Fault Diagnosis Method Based on Symmetrical Polar Coordinate Image and Fuzzy C-Means Clustering Algorithm

Table 2

Main components involved in the test bench.

Component name	Remarks
Y132-M4 motor	Rated speed 1480 r/min
FR-E740-7.5K-CHT frequency converter	Rated current 17A
YD-72D acceleration sensor	Frequency range 1 Hz∼18 kHz, charge sensitivity 0.342 pC/ms^−2
MCY14-1B plunger pump	7 plunger, theoretical displacement 10 ml/r, nominal pressure 31.5 MPa, rated speed 1500 rpm
DHF-6A charge amplifier	Gain 0.1 m V∼1 V/pc, power supply voltage AC220 V/50 Hz, frequency response 0.3 Hz∼100 kHz
USB6221 data acquisition card	16 analog inputs, input voltage −10 V∼10 V, sampling rate 250 kS/s