Research Article
Certain Type Turbofan Engine Whole Vibration Model with Support Looseness Fault and Casing Response Characteristics
Figure 9
Time domain waveform and frequency spectrum before and after the noise reduction when the rotating speed is 19500 rpm.
(a) The waveform before the noise reduction |
(b) The waveform after the noise reduction |
(c) The spectrum before the noise reduction |
(d) The spectrum after the noise reduction |