Undecimated Lifting Wavelet Packet Transform with Boundary Treatment for Machinery Incipient Fault Diagnosis

<div>Illustration of experimental setup, (a) data acquisition system, ① control panel, ② data acquisition box, ③ accelerometer on the exhaust valve lid, ④ exhaust valve, and (b) diagram of reciprocating compressor.</div>

Shock and Vibration

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Figure 3

Figure 3: Undecimated Lifting Wavelet Packet Transform with Boundary Treatment for Machinery Incipient Fault Diagnosis 