POWER June 2011 - 61

COMBUSTION TURBINES
tire driveline, there is the potential for torsional,
lateral, or blade resonance to cause
fatigue failure. The coupling between the
turbine and gearbox or gearbox to generator,
for example, is the best option for
tuning the torsional character of the driveline.
There are a couple of coupling options:
high torsional stiffness (preferably
dry flexible diaphragm type)-or direct
forged flanged rigid connection (which is
optimum, if allowed by torsional analysis),
and a flexible coupling with more elasticity,
damping, and more maintenance.
The coupling torque is usually chosen
on the basis of average requirements for
full load, but it also must have a sufficient
service factor to handle likely overload
(such as electrical faults). A pulsation of
generator load caused by current pulsation
is an important concern, especially for a
CT or a plant electrical network that is connected
to a relatively weak electric system.
Our comparative analysis showed a >25%
error in shaft stiffness and inertia between

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POWER June 2011

Table of Contents for the Digital Edition of POWER June 2011

Contents
POWER June 2011 - Cover1
POWER June 2011 - Cover2
POWER June 2011 - Contents
POWER June 2011 - 2
POWER June 2011 - 3
POWER June 2011 - 4
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POWER June 2011 - Cover3
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