Post on 26-Apr-2020
Main engine- or propeller induced
vibration problems ?
Why deal with the symptoms -
When we can eliminate the source !
Our partners:
Engine induced forces and moments
Guide Force Moment
(Horizontal)
External Unbalanced Moment
(Vertical)
Horizontal Compensator Type
Horizontal Compensator Type
The G&O compensator produces:
In exact opposite direction.
At a very exact timing/phase angle.
An exact size of counterforce.
2nd Order External Moment
1st cycle
2nd cycle
2nd Order External Moment
2nd order compensation with engine mounted balancers
Positioning of the hull node
Positioning of the hull node
The external 2nd order solution
Positioning of the hull node
2nd order external moment test example:
Press release winter 2005
Guide Force H-Moment
Position of the H-moment compensator
H
Cylinder No. 3 Horizontal Tranverse (4.17 - 6.33 Hz).
0,00
10,00
20,00
30,00
40,00
50,00
60,00
70,00
50 52 54 56 58 60 62 64 66 68 70 72 74 76
Main engine rpm.
Vib
rati
on
velo
cit
y in
mm
/s.
Main engine with C-90H Main engine alone
Cylinder No. 3 Horizontal Tranverse (4.17 - 6.33 Hz).
0,00
10,00
20,00
30,00
40,00
50,00
60,00
70,00
50 52 54 56 58 60 62 64 66 68 70 72 74 76
Main engine rpm.
Vib
rati
on
velo
cit
y in
mm
/s.
Main engine with C-90H Main engine alone
Guide force H-moment test example:
Guide Force X-Moment
Guide force X-moment
L
Guide force X-moment test example:
Hull beam and propeller vibrations
Hull beam and propeller vibrations
Hull beam test example:
Installation and commissioning
Thank you for listening!