Automatic Display of Campbell Diagrams of Start-Up and Run-Dow Processes

Evaluations of vibration measurements in frequency domain are often carried out by Campbell-diagrams and order analysis. A method working without speed sensors is presented. Dominating frequency lines are followed automatically by shifting a small frequency window over the speed-depending spectra and finding out the frequency line with maximum power in the window. Applications are shown for a steam-turbine and a turbocompressor with gearbox and asynchronuous motor.