Abstract
The application of a laser scanning vibrometer to detect resonance frequencies and mode shapes of large impeller rotors is illustrated. The dynamic analysis of the structure has been previously performed by means of a standard FEM code. The key to success was the ability of the laser vibrometer to detect very low vibration amplitudes (of the order of nanometers) with a high spatial resolution, inside an industrial environment, in very low testing time; all fundamentals for this application. The experimental and numerical activity presented in this work has been carried out at Nuovo Pignone together with the University of Ancona with the final purpose of establishing a new, fast measurement technique to identify, in a production industrial environment, the dynamic behaviour of large dimension impellers for centrifugal compressors.
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