DANS LE DOMAINE DES TRANSPORTS, LA NECESSITE DE SE CONFORMER A DES NORMES ACOUSTIQUES SANS CESSE PLUS SEVERES ET L'ACCESSION DE LA NOTION DE CONFORT ACOUSTIQUE AU RANG DE CRITERE ESSENTIEL DE QUALITE DU PRODUIT, ONT CONDUIT LES INDUSTRIELS A S'INTERESSER AU DEVELOPPEMENT DE MODELES PREDICTIFS DU COMPORTEMENT VIBROACOUSTIQUE DES VEHICULES, ENCORE TRES MAL COMPRIS. IL EST AINSI APPARU NECESSAIRE D'ENGAGER DES RECHERCHES SUR LE COMPORTEMENT VIBROACOUSTIQUE DE GRANDES STRUCTURES COMPLEXES EN MOUVEMENT DANS UN FLUIDE LEGER INFINI. NOTRE TRAVAIL S'INSCRIT PLUS PARTICULIEREMENT DANS LE DOMAINE BASSES FREQUENCES POUR LEQUEL LES SOLLICITATIONS SURVENANT A GRANDE VITESSE SONT PRINCIPALEMENT D'ORIGINE AEROACOUSTIQUE. L'OBJECTIF EST DE PROPOSER UNE NOUVELLE APPROCHE, BASEE SUR LA COMPREHENSION PHYSIQUE DES PRINCIPAUX PHENOMENES GENERATEURS DU BRUIT INTERNE, ET QUI SE POSITIONNE COMME UNE ALTERNATIVE AUX METHODES DE DISCRETISATION POUR DES ETUDES AVANT-PROJET. LA METHODE RETENUE EST UNE METHODE MIXTE SIMPLIFIEE ALLIANT THEORIE ET EXPERIENCE: S'APPUYANT SUR DES CONNAISSANCES EXPERIMENTALES POUR DIMINUER LA COMPLEXITE DU SYSTEME, LA MODELISATION REPOSE SUR UNE APPROCHE ANALYTIQUE INTEGRO-MODALE ASSOCIEE UNE TECHNIQUE DE RAYLEIGH-RITZ. DEVELOPPEE D'ABORD DANS LE CADRE GENERAL DE STRUCTURES MINCES QUELCONQUES, L'APPROCHE EST ILLUSTREE DANS UN SECOND TEMPS SUR UN SYSTEME PARALLELIPIPEDIQUE CONSTITUE DE PLAQUES PLANES ORTHOTROPES. L'UNE DES PRINCIPALES ORIGINALITES DE NOTRE ETUDE CONSISTE A ENVISAGER LA TRANSMISSION ACOUSTIQUE DE STRUCTURES HETEROGENES SOUMISES A DES EXCITATIONS AEROACOUSTIQUES. NOUS ABOUTISSONS ALORS A LA DEFINITION D'UN OUTIL NUMERIQUE SOUPLE CAPABLE DE DETERMINER LES MODES ET CHEMINS DE TRANSMISSION PRIVILEGIES DU BRUIT, AMELIORANT AINSI NOTRE CONNAISSANCE DE CES SYSTEMES ET AUTORISANT DE SURCROIT DES ACTIONS VISANT A REDUIRE LES NIVEAUX SONORES SUBIS PAR LES PASSAGERS. UNE APPLICATION SPECIFIQUE EST REALISEE SUR LE CAS DU T.G.V. DUPLEX, DANS LE CADRE D'UNE COLLABORATION AVEC LA SNCF SUR UN PROJET D'AMELIORATION DU CONFORT ACOUSTIQUE DANS LE DOMAINE 0-500 HERTZ

The 5th International Congress on Design and Modeling of Mechanical Systems (CMSM) was held in Djerba, Tunisia on March 25-27, 2013 and followed four previous successful editions, which brought together international experts in the fields of design and modeling of mechanical systems, thus contributing to the exchange of information and skills and leading to a considerable progress in research among the participating teams. The fifth edition of the congress (CMSM ́2013), organized by the Unit of Mechanics, Modeling and Manufacturing (U2MP) of the National School of Engineers of Sfax, Tunisia, the Mechanical Engineering Laboratory (MBL) of the National School of Engineers of Monastir, Tunisia and the Mechanics Laboratory of Sousse (LMS) of the National School of Engineers of Sousse, Tunisia, saw a significant increase of the international participation. This edition brought together nearly 300 attendees who exposed their work on the following topics: mechatronics and robotics, dynamics of mechanical systems, fluid structure interaction and vibroacoustics, modeling and analysis of materials and structures, design and manufacturing of mechanical systems. This book is the proceedings of CMSM ́2013 and contains a careful selection of high quality contributions, which were exposed during various sessions of the congress. The original articles presented here provide an overview of recent research advancements accomplished in the field mechanical engineering.

Controlling the level of noise in electrical motors is critical to overall system performance. However, predicting noise of an electrical motor is more difficult and less accurate than for other characteristics such as torque-speed. Recent advances have produced powerful computational methods for noise prediction, and Noise of Polyphase Electric Motors is the first book to collect these advances in a single source. It is also the first to include noise prediction for permanent magnet (PM) synchronous motors. Complete coverage of all aspects of electromagnetic, structural, and vibro-acoustic noise makes this a uniquely comprehensive reference. The authors begin with the basic principles of noise generation and radiation, magnetic field and radial forces, torque pulsations, acoustic calculations, as well as noise and vibration of mechanical and acoustic origin. Moving to applications, the book examines in detail stator system vibration analysis including the use of finite element method (FEM) modal analysis; FEM for radial pressure and structural modeling; boundary element methods (BEM) for acoustic radiation; statistical energy analysis (SEA); instrumentation including technologies, procedures, and standards; and both passive and active methods for control of noise and vibration. Noise of Polyphase Electric Motors gathers the fundamental concepts along with all of the analytical, numerical, and statistical methods into a unified reference. It supplies all of the tools necessary to improve the noise performance of electrical motors at the design stage.

In the twenty-five years since its discovery by Zavoiskii, the technique of electron spin resonance (ESR) spectroscopy has provided detailed struc tural information on a variety of paramagnetic organic and inorganic sys tems. It is doubtful that even much later than 1945 any chemist would have been so bold as to predict the great diversity of systems which have proved amenable to study by ESR spectroscopy. In this book we have attempted to provide numerous examples of actual ESR spectra to illus trate the wide scope of application. No attempt has been made to present a comprehensive coverage of the literature in any field, but references to reviews and key articles are given throughout the book. This introductory textbook had its origin in lecture notes prepared for an American Chemical Society short course on electron spin resonance. The present version is the result of extensive revision and expansion of the original notes. Experience with such courses has convinced us that there are large numbers of chemists, physicists, and biologists who have a strong interest in electron spin resonance. The mathematical training of most of the short-course students is limited to calculus. Their contact with theories of molecular structure is largely limited to that obtained in an elementary physical chemistry course. It is to an audience of such background that this book is directed.

The acoustic quality of a concert hall has frequently posed a mysterious puzzle, namely, what physical aspects of the sound field can produce superior sound for the listener. The author has been probing for more than adecade into the subjective qualities preferred for musical and speech sounds. The result of his extensive investigations - the discovery that four and only four independent parameters contribute effectively to good acoustics - is summarized in the present book. The capability of calculating acoustical quality at any seat in a proposed concert hall is a unique and quite useful aspect of Ando's design method. Alternative architectural schemes can be compared based on the number of seats which exceeds a previously accepted minimum standard of acoustical quality.

This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.