Angular Misalignment

Figure 1 - Typical FFT Generated By Angular Misalignment Definition: Shaft Centerlines Intersect But Are Not Parallel	Figure 2  - Shaft Centerlines Intersect @ The Coupling. Note The Absence Of Coupling Movement And The High Radial & Axial Bearing Movement.
Angular Misalignment Symptoms: High axial vibration @ 1x rpm, possible harmonics at 2x & 3x. 2x rpm axial component may be as high or even higher than 1x component. Radial vibration, probably lower amplitude than the axial, at 1x, 2x and 3x. Radial vibration will depend on where the shaft centerlines intersect the assembly centerline. Axial phase across coupling shifts significantly (> 60°).	Figure 3 - Shaft Centerlines Intersect @ The Bearings. Note The High Radial Coupling Movement, The Low Radial & The High Axial Bearing Movement.