Vibration that occur due to the center line of rotation axis between two coupled shafts are not aligned while operating

1. Missalignment Vibration
By :
Ryan Sayoga (15/379072/TK/43014)
Avyattana (15/379989/TK/43254)
Mevrindo Al Fiqie (15/379996/TK/43261)
Teguh Nur Iman (15/379076/TK/43018)

2. What’s Misalignment
Vibration?
• Vibration that occur due to the center line of rotation axis between
two coupled shafts are not aligned while operating

3. Types of
Misalignment
Vibration

4. Parallel Misalignment
Parallel misalignment is occured when the centerlines are parallel but
one of the shaft is below or above the line.
Offset
The spectrum
shows the high vibration at
second wave and it has 180
degree of difference to the
first wave.

5. Angular Misalignment
is happened when the shaft centerlines coincide at the same one
point followed by the projected axis of both shafts.
Angle
The spectrum
high axial vibration at first
wave to the second wave are
having a difference about 180
degree phase and second
wave to the third wave are
having different about 180
degree as well.

6. General Misalignment
• The most common type of misalignment
• Occured when the shafts are not in the parallel condition or having a cut
through (intersect) the clutch.
The spectrum
the first and second wave are
having the same high and
they slow down the vibration
rate after the second wave.
AngleOffset

7. What’s The
Indication?

8. Indication
• Loose bolts on engine foundation
• Large amount of broken coupling bolts, broken coupling bush, damaged
coupling gear.
• The large amount of grease (or oil) on the coupling guard
• High temperature
• Number of oil usage and seal replacement

9. Disadvantage of
Misalignment

10. Disadvantage
• Energy consumption (Fuel, Electricity, Steam) of motor increased by about 5% -
10%
• Engine’s load are increased. Bearing’s lifetime decreases with increasing load.
• Premature damage at bearing, shaft, seal, coupling, etc.
• Make overheat at case, bearing or lubrications.
• Leakage in seals bearing, mechanical seal.
• The coupling can heat rapidly and quickly damaged.
• The coupling’s bolts can loose or broken easily.

11. The Clasification of
Misalignment

12. Clasification
• Unsafe alignment : The levels of misalignment which is out of limitation from
the misalignment tolerance.
• Poor alignment : The levels of misalignment which is on the limitation range of
the misalignment tolerance but out of the recommendation number of
tolerance.
• Acceptable alignment : the levels of misalignment which is on the
recommendation range of tolerance number so that it can work properly.
• Excellent alignment : the levels of misalignment which is close to the perfect
alignment.

13. Thank You