Volvo D11 series, Installation Manual

Page: 28 / 212

Torsional vibrations and TVC calculations
26
Example of a complex masselastic system
The Drive package, i.e. engine, flexible coupling,
and reverse gear, supplied by Volvo Penta has as
one unit the lowest possible torsion vibration level
in terms of standard propeller systems. A Torsional
Vibration Calculation (TVC) must be conducted by
Volvo Penta if other combinations are to be used.
Incorrectly selected components in the drive package
can result in abnormally high stress of the engine’s
crankshaft.
Routines for handling TVC
When a
Torsional Vibration Calculation is request-
ed, it can be carried out by Volvo Penta.
The following procedure should be followed:
. All necessary documents should be sent to the
Quality System and Classification Department ,
which will issue an order number that will be the
reference number for future communication re-
garding the matter.
2. All communication in TVC matters should be
directed to the Quality System and Classifica-
tion Department. The responsibility for internal
handling is on Quality System and Classification
Department at the production unit in Göteborg.
. Engine
2. Coupling, disengagable
3. Pulley
4. Coupling
5. Pump, compressor etc. with
the same rpm as engine
6. Reduction gear, reverse gear
2
2
3
0
5
4
3
2
4
6
7 3
8
9
3
2
8
9
2
0
7. Flange coupling
8. Alternator, compressor
9. Propeller shaft and propeller
0. Belt
. Belt tensioner
2. Pump, compressor
3. The cost for TVC will be charged according to the
following principle: If the received documentation
is complete from the beginning a basic calculation
will be charged according to the price list.
Each additional operation, e.g. recalculation due
to missing or wrong information or complex calcu-
lations, will be charged at actual cost.
It is therefore of extreme importance that the doc-
uments for the calculation are complete and that
no information is missing.