Dynamic balancing of a Ruston TA 1750 turbine. Effect in the location of the vibration sensors

Abstract

Vibration measurements were realised to a

Ruston TA 1750 turbine in-situ and at

operation conditions, with accelerometers

mounted in the case and directly in the

bearing housing of the axial compressor

due to a minor modification, in order to

compare the values of amplitude and phase

of the synchronous filtered vibration (1X)

and determining their effect in the two

planes balance procedure by the influence

coefficients method. This rotor operates

over its critical velocity, and is for this

reason that it is considered flexible and

must be balanced in site and to its

operation conditions. The system response

to unbalance depends on the dynamic

characteristics of the rotor, its bearings and

supports; and the vectors of the measured

dynamic forces will be sensible to the

location where they were taken, being able

to present non-linearities on its response as

they move away of the bearing.