Vibration measurements on blades of naval propeller rotating in water

Paolo Castellini; Claudio Santolini

doi:10.1117/12.248638

23 August 1996 Vibration measurements on blades of naval propeller rotating in water

Paolo Castellini, Claudio Santolini

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248638
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

Abstract

A powerful technique for monitoring and analyzing mechanical systems is the application of laser Doppler vibration measurements. When the object to be analyzed rotates, the measurement becomes difficult. That is, when a steady laser beam is used, the presence of a tangential motion of surface determines a noisy disturbance. The speckle pattern produced by the roughness of the analyzed surface is moving with the surface itself, and this phenomenon is observed as a signal with a frequency depending on the rotational speed. For these reasons, the aim of the present work is to show the possibility of Eulerian approach to the vibration measurement of rotating objects. A Laser Scanning Vibrometer has been used for the tracking of the same point in the complete circular motion. The capabilities of this system are tested on the measurement of vibration map of blades of a model of naval propeller working in water: a comparison has been found with the static analysis, in water and air, of the same propeller. Some results are shown.

Citation Download Citation

Paolo Castellini and Claudio Santolini "Vibration measurements on blades of naval propeller rotating in water", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248638

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