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Mechanical vibration — Torsional vibration of rotating machinery — Part 1: Evaluation of steam and gas turbine generator sets due to electrical excitation
No guidelines are given regarding the torsional vibration response caused by steam excitation or other excitation mechanisms not related to the electrical network.
Where the shaft cross sections and couplings do not fulfil the required strength criteria and/or torsional natural frequencies do not conform with defined frequency margins, other actions shall be defined to resolve the problem.
The requirements included in this document are applicable to
a) steam turbine generator sets connected to the electrical network, and
b) gas turbine generator sets connected to the electrical network.
Methods currently available for carrying out both analytical assessment and test validation of the shaft train torsional natural frequencies are also described.
NOTE Radial (lateral, transverse) and axial vibration of steam and/or gas turbine generator sets is dealt with in ISO 20816-2.
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