Vipac Engineers & Scientists Ltd offers consulting services in Rotor Dynamics Analysis of turbo-machinery, a proven method for reducing
maintenance costs and preventing emergency shutdowns. Typical applications for rotor dynamics measurement
and analysis are turbine recommissioning, condition monitoring, advanced fault diagnosis, alignment verification
and field balancing.
Whilst many turbo-machinery rotors are successfully shop balanced at low or high speed, some rotors can
only be balanced in their casings in the field. Field balancing is also necessary for machines with segmented
rotors or when the final rotor assembly is not achieved until most of the stationary elements are bolted into
place, such as turbo-alternators.
Vipac's expert services in Rotor Dynamics Analysis include:
32 Channel Data Acquisition System used to collect Bearing Cap and Proximity Probe (shaft) vibration.
Slow roll vector acquisition, under the same conditions. If the slow roll vectors change from run to run, then other influences should be considered (eg. cracked shaft).
Transient start-up and coastdown data used for determination of balance sensitivities, interplane influence coefficients & rotor criticals.
Bode & Polar plots used to determine machine condition & balance status. (1x synchronous response & mode shape information).
Cascade or Waterfall plots used to verify frequency spectra characteristics and historical changes of machine condition.
Analytical modelling used to calculate natural frequencies and mode shapes from the effects of bearing stiffness and damping that varies with speed. Analytical techniques can be combined with vibration measurement to explain complex machine behaviour and/or model design modifications before implementation.
To find out more about these services, please email:
