Method for measuring shafting mechanical fatigue of turbine generator set
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United States of America Patent
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Aug 6, 2013
Grant Date -
Sep 30, 2010
app pub date -
Nov 28, 2008
filing date -
Dec 4, 2007
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Abstract
A method for measuring a shafting mechanical fatigue of a turbine generator set, which involves determining a lumped mass model of a turbine generator set and its parameters; calculating a model frequency and a mode shape of the turbine generator set; acquiring an angular velocity change at a machine end; calculating a torque at a calculating section of shafting based on the model frequency, a mode shape curve and an equivalent rigidity of the lumped mass model, so as to obtain a torque-time history curve at the calculating section of the shafting; calculating a fatigue damage accumulative value for a dangerous section of a set shafting under a certain malfunction or disturbance, that is, the shafting mechanical fatigue of the turbine generator set.
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