A More Reliable Method for Monitoring the Condition of Three-Phase Induction Motors Based on Their Vibrations

Figure 3

Time- and frequency-domain representations of the two signals 𝑓₁ and 𝑓₂: (a) 𝑓₁ time domain, (b) 𝑓₁ time frequency-domain, (c) 𝑓₂ time domain, and (d) 𝑓₂ time-frequency domain.

(a)

(b)

(c)

(d)