The benefits of modelling turbomachinery for diagnostic and condition monitoring purposes have not been fully appreciated by the power generation industry or the consultants who service the industry. This paper describes the capabilities and practical application of vibration analysis software for analysing rotor bearing systems of rigidly coupled rotors supported on several hydrodynamic bearings of various bearing profiles. The software has two distinct components — the measurement component and the modelling component. The combination of the two provides access to existing rotating machinery and machinery in the commissioning stage in order to identify the cause of vibration problems and the corrective action required. The modelling software evaluates the effects of bearing alignment changes and operating parameter changes on system stability and vibration response. The data collection analysis software that links with the modelling results provides valuable information about the measured shaft performance at the bearings. The combination of the two components provides an efficient and valuable tool that yields significant cost benefits. The application of the software to a 360Mw and 450Mw unit is evaluated.

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