An Investigation into Error Source Identification of Machine Tools Based on Time-Frequency Feature Extraction

Figure 10

Measured signal of spindle system in different conditions. (a) Case is turning on all, that is, the air pump, the oil pump, and the electronic control system; (b) case is just turning on the air pump; (c) case is turning on the air pump and oil pump; (d) case is turning on the air pump and electronic control system.

(a)

(b)

(c)

(d)