Vibration analysis of model hull appendages by a scanning laser vibrometer system

Arnaud Serander; Philippe Rittemard; Herve Decrock

doi:10.1117/12.185339

8 September 1994 Vibration analysis of model hull appendages by a scanning laser vibrometer system

Arnaud Serander, Philippe Rittemard, Herve Decrock

Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185339
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy

Abstract

Experiments were performed in a water tunnel to measure vibrations on a model hull appendage. The model was especially constructed to be in hydroelastic similitude. A scanning laser vibrometer system has been developed for these experiments. It is able to scan a 3D-grid map. The optical head was mounted on a displacement table controlled by the system. For each point of the model surface, the laser focus, the dynamic range are monitored by a personal computer and the vibration velocity signal is recorded automatically. The data are then processed. Multiple FFT averaging is done on each point for the vibrometer and for a reference accelerometer located on the model. The different frequencies corresponding to the structural resonances of the model are provided. For each of these frequencies, the system gives the amplitude of the vibration after integration of the velocity signal. The vibration map of the scan area can be displayed. The results of the different vibration modes were similar to those predicted by simulation.

Citation Download Citation

Arnaud Serander, Philippe Rittemard, and Herve Decrock "Vibration analysis of model hull appendages by a scanning laser vibrometer system", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185339

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