By Tahar Fakhfakh, Fakher Chaari, Lasaad Walha, Moez Abdennadher, Mohamed Slim Abbes, Mohamed Haddar
The publication offers readers with a photo of modern examine and business developments in box of business acoustics and vibration. each one bankruptcy, accredited after a rigorous peer-review procedure, stories on a particular, unique piece of labor offered and mentioned at foreign convention on Acoustics and Vibration (ICAV2016), which used to be geared up by means of the Tunisian organization of business Acoustics and Vibration (ATAVI) and held March 21-23, in Hammamet, Tunisia. The contributions, in general written by means of north African authors, covers advances in either idea and perform in various subfields, equivalent to: clever fabrics and buildings; fluid-structure interplay; structural acoustics in addition to computational vibro-acoustics and numerical equipment. additional subject matters comprise: engines keep watch over, noise id, powerful layout, flow-induced vibration and lots of others.This booklet offers a precious source for either teachers and pros facing diversified concerns in utilized mechanics. by means of combining complex theories with commercial matters, it's anticipated to facilitate conversation and collaboration among diverse teams of researchers and expertise users.
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Extra info for Advances in Acoustics and Vibration: Proceedings of the International Conference on Acoustics and Vibration (ICAV2016), March 21-23, Hammamet, Tunisia
In this paper, an interpolation method is provided to get the continual velocity layout on the surface of the structure from measured surface velocity. Base on the obtained continual velocity distribution, the sound radiation of the structure can be fast and precisely obtained through boundary element method. This interpolation method is also validated experimentally. 2 Interpolation Method for Surface Velocity on Structure For an axial symmetric cylinder model, only half of its surface needs to be calculated because of its symmetry.
8 Spectrogram of the ﬁrst IMF for 5 % of defect and 50 % of load 4 Conclusion In this study we have used the EEMD method to analyze non-stationary signals that give information about the variable conditions such as variable speed and load. The EEMD method achieves good modes separation. To detect the fault masked by simultaneous variation of load and presence of defect, EEMD showed successful separation of the different modes that correspond to the variation of load and the effect of fault. We have also used the spectrogram to detect the period of the impulses due to the fault, and we have observed that the huge load (50 %) cover information if the defect is less than 5 % in severity.
Generation of swept-sine signals is made up using an analyzer Stanford Research Systems SR785. The signals started by a start and end frequencies ranging from 10 Hz to 2 kHz.