By Tahar Fakhfakh, Fakher Chaari, Lasaad Walha, Moez Abdennadher, Mohamed Slim Abbes, Mohamed Haddar
The booklet offers readers with a image of contemporary examine and business tendencies in box of business acoustics and vibration. every one bankruptcy, accredited after a rigorous peer-review strategy, stories on a particular, unique piece of labor awarded and mentioned at foreign convention on Acoustics and Vibration (ICAV2016), which used to be prepared by way of the Tunisian organization of business Acoustics and Vibration (ATAVI) and held March 21-23, in Hammamet, Tunisia. The contributions, mostly written by way of north African authors, covers advances in either idea and perform in a number of subfields, akin to: clever fabrics and buildings; fluid-structure interplay; structural acoustics in addition to computational vibro-acoustics and numerical tools. additional issues comprise: engines keep an eye on, noise identity, strong layout, flow-induced vibration and lots of others.This e-book offers a helpful source for either lecturers and execs facing varied concerns in utilized mechanics. by means of combining complex theories with commercial matters, it truly is anticipated to facilitate communique and collaboration among diversified teams of researchers and expertise users.
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Additional info for Advances in Acoustics and Vibration: Proceedings of the International Conference on Acoustics and Vibration (ICAV2016), March 21-23, Hammamet, Tunisia
N vi vi . vi cients are related to the modal electromechanical coupling factors (MEMCF), ðpÞ denoted ki , which characterize, for each mode i, energy exchange between the mechanical structure and the piezoelectric patch p (Thomas et al. 2009): ð pÞ ki ð pÞ ðpÞ vi ¼ pﬃﬃﬃﬃﬃﬃﬃﬃ CðpÞ xi ð6Þ Those factors (ki ) are found very close to the classical effective electromechanical coupling factor (EEMCF) deﬁned in IEEE (Thomas et al. 2009). Moreover, the optimal electric parameters are classically obtained as closed-formed expressions which depend only on (i) the natural frequency in short circuit of the considered vibration mode as well as its modal coupling factor and (ii) the equivalent electrical blocked capacity of the patches (Thomas et al.
Influence of the distance T À T 0 : To analyze the influence of the distance between the two paths T and T 0 , we vary the position of T 0 from the plane P ¼ fz2 ¼ yjy ¼ À4kg at the altitude z ¼ 8k; to the plane P ¼ fz2 ¼ yjy ¼ 4kg at altitude qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ z ¼ 12k; with steps in space dy ¼ k2 and dh ¼ k8. We set d ¼ ðy À y0 Þ2 þ ðz À z0 Þ2 the distance between the two line paths T and T 0 . In the same way as before, we Identiﬁcation of Small Objects with Near-Field Data … 51 Fig.
2) can be reduced by pro short-circuit eigenmodes fUi g, jecting the mechanical displacement into the ﬁrst N PN such as fUðxÞg ¼ i¼1 fUi gui ðxÞ, N ( N. As a result, the reduced problem consists in solving the following system: 8 ð pÞ ð pÞ P P P ð pÞ N À Á P P > vi vn vi > > Àx2 þ 2jxni xi þ x2i ui þ u þ Qð pÞ ¼ Fi 8i ð p Þ < n C C ð pÞ > > > : Àx2 LðepÞ þ jxRðepÞ þ p¼1 n¼1 p¼1 ð pÞ N P vn 1 ð pÞ þ u ¼ 0 8p Q ð p Þ C ð pÞ n C ð5Þ n¼1 where Fi ¼ fUi gT fFg, xi and ni are the modal force, SC natural frequency and ðpÞ modal damping coefﬁcient of the ith mode, and vi is the modal coupling coefﬁcient associated to the ith mode and the pth patch, which is deﬁned by ð1Þ ð2Þ ðPÞ g.
Advances in Acoustics and Vibration: Proceedings of the International Conference on Acoustics and Vibration (ICAV2016), March 21-23, Hammamet, Tunisia by Tahar Fakhfakh, Fakher Chaari, Lasaad Walha, Moez Abdennadher, Mohamed Slim Abbes, Mohamed Haddar