Download or read book tude du confort vibro acoustique automobile en simulateur written by Maël Amari and published by . This book was released on 2009 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’intégration des facteurs humains dans la conception automobile est aujourd’hui un enjeu majeur de l’innovation et le confort de roulage à basse vitesse est au cœur des préoccupations industrielles. Dans cette situation, le confort dépend essentiellement de l’environnement vibro-acoustique de l’habitacle. Les évaluations de confort d’une telle situation constituent le cadre de ce travail. Ce type d’étude nécessite l’utilisation de simulateurs qui permettent la maîtrise des caractéristiques de l’environnement. Mais, il existe toujours des limites à l’immersion et, la simulation modifie le contexte cognitif dans lequel se trouve le passager. Deux expériences sont réalisées pour mesurer l’influence de l’environnement de simulation sur les évaluations de confort. Les contributions relatives de l’immersion et des informations contextuelles apportées par les modalités vibratoires, sonores et visuelles sont estimées. Les propriétés physiques des stimuli, significatives pour le confort, sont ensuite identifiées. Les contributions relatives des niveaux sonores et vibratoires au confort automobile sont modélisées. L’existence d’une image perceptive du confort vibratoire des véhicules est également recherchée. Enfin, les travaux appréhendent les liens entre les prestations offertes par un véhicule et le confort vibro-acoustique. Des évaluations expertes d’items de cotation des véhicules sont comparées à des évaluations de confort faites par des sujets naïfs. Deux expériences perceptives sont mises en place. Ainsi, les liens entre les paramètres de synthèse et les évaluations permettent d’identifier les items de cotation les plus pertinents pour le confort.

Download or read book Fiabilit de la m thode de pr diction vibro acoustique SEA dans un contexte d valuation subjective du confort acoustique automobile written by Valentin Miqueau and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: À mesure que les habitacles des nouveaux véhicules deviennent de plus en plus silencieux, la qualité du son et le confort acoustique intérieurs se sont imposés comme des arguments de premier ordre pour les constructeurs automobiles afin de se démarquer de leurs concurrents. Actuellement, la recherche sur la perception sonore repose sur une approche expérimentale basée sur la réécoute, par des jurys, de signaux enregistrés sur des proto375 types. Pour éviter ces coûteux dispositifs, une approche numérique est ici envisagée. Les résultats d'un modèle basé sur la méthode SEA (Statistical Energy Analysis), développé par Saint-Gobain Research Compiègne, servirait à générer les signaux des expériences subjectives. Celui-ci permet d'ores et déjà de prédire l'impact de changement de vitrage sur le niveau sonore intérieur d'un véhicule exposé aux bruits environnementaux. En revanche, son emploi pour évaluer le confort automobile apporté par ces mêmes changements soulève plusieurs interrogations auxquelles nous répondons dans cette thèse : -- Comment générer des signaux audios à partir des niveaux de pressions acoustiques prédits? -- Les signaux obtenus permettent-ils de réaliser des études du confort acoustique dans l'habitacle avec la même efficacité que des enregistrements mesurés sur véhicule? Tout d'abord, un procédé de génération des signaux à partir des données obtenues grâce au modèle numérique a été proposé puis validé par une expérience perceptive. Ensuite, deux autres évaluations subjectives par un jury ont mis en lumière une évolution du désagrément ressenti similaire, pour plusieurs configurations de vitrages quelle que soit l'origine des sons (simulés ou mesurés). Elles ont cependant souligné une divergence dans les évaluations lors de l'introduction de verre trempé dans les configurations véhicule. Les joints de vitrage, absents du modèle, étaient alors suspectés d'être à l'origine de cette variation. Par la suite, l'examen expérimental du comportement vibro-acoustique des verres montés dans les joints a permis d'observer un apport de dissipation des joints. Celui- ci se traduisait alors par une augmentation de l'isolation acoustique du vitrage. Cette isolation caractérisant les vitrages dans le modèle, sa sensibilité aux apports de dissipation des joints de vitrage devait être intégrée dans notre approche numérique. Enfin, après avoir analysé les mécanismes de dissipation intervenant pour le vitrage et les joints, un modèle numérique basé sur la méthode éléments finis a été mis en place. Il prédit l'isolation acoustique du vitrage à intégrer dans le modèle numérique SEA pour tenir compte de l'effet des joints aux limites de l'échantillon de verre. Étant donné que la calibration du modèle à des moyennes et hautes fréquences est le fruit d'un processus empiriques de recherche de paramètres, il demeure essentiel de considérer une révision par de futurs travaux du modèle et de la méthode de recherche.

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book Engines and Powertrains written by Ronald K Jurgen and published by SAE International. This book was released on 2010-11-29 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: With production and planning for new electric vehicles gaining momentum worldwide, this book – the third in a series of five volumes on this subject – provides engineers and researchers with perspectives on the most current and innovative developments regarding electric and hybrid-electric vehicle technology, design considerations, and components. This book features 13 SAE technical papers, published from 2008 through 2010, that provide an overview of research on electric vehicle engines and powertrains. Topics include: Hybrid-electric vehicle transmissions and propulsion systems The development of a new 1.8-liter engine for hybrid vehicles Vehicle system control software validation The impact of hybrid-electric powertrains on chassis systems and vehicle dynamics High-torque density motors, and interior permanent magnet synchronous motors

Download or read book Japanese Railway Engineering written by and published by . This book was released on 1993 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Riveted Lap Joints in Aircraft Fuselage written by Andrzej Skorupa and published by Springer Science & Business Media. This book was released on 2012-06-23 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue of the pressurized fuselages of transport aircraft is a significant problem all builders and users of aircraft have to cope with for reasons associated with assuring a sufficient lifetime and safety, and formulating adequate inspection procedures. These aspects are all addressed in various formal protocols for creating and maintaining airworthiness, including damage tolerance considerations. In most transport aircraft, fatigue occurs in lap joints, sometimes leading to circumstances that threaten safety in critical ways. The problem of fatigue of lap joints has been considerably enlarged by the goal of extending aircraft lifetimes. Fatigue of riveted lap joints between aluminium alloy sheets, typical of the pressurized aircraft fuselage, is the major topic of the present book. The richly illustrated and well-structured chapters treat subjects such as: structural design solutions and loading conditions for fuselage skin joints; relevance of laboratory test results for simple lap joint specimens to riveted joints in a real structure; effect of various production and design related variables on the riveted joint fatigue behaviour; analytical and experimental results on load transmission in mechanically fastened lap joints; theoretical and experimental analysis of secondary bending and its implications for riveted joint fatigue performance; nucleation and shape development of fatigue cracks in riveted longitudinal lap joints; overview of experimental investigations into the multi-site damage for full scale fuselage panels and riveted lap joint specimens; fatigue crack growth and fatigue life prediction methodology for riveted lap joints; residual strength predictions for riveted lap joints in a fuselage structure. The major issues of each chapter are recapitulated in the last section.

Download or read book Computational Acoustics written by Manfred Kaltenbacher and published by Springer. This book was released on 2017-07-10 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a state-of-art overview of numerical schemes efficiently solving the acoustic conservation equations (unknowns are acoustic pressure and particle velocity) and the acoustic wave equation (pressure of acoustic potential formulation). Thereby, the different equations model both vibrational- and flow-induced sound generation and its propagation. Latest numerical schemes as higher order finite elements, non-conforming grid techniques, discontinuous Galerkin approaches and boundary element methods are discussed. Main applications will be towards aerospace, rail and automotive industry as well as medical engineering. The team of authors are able to address these topics from the engineering as well as numerical points of view.

Download or read book Acoustic Array Systems written by Mingsian R. Bai and published by John Wiley & Sons. This book was released on 2013-03-07 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a unified framework of far-field and near-field array techniques for noise source identification and sound field visualization, from theory to application. Acoustic Array Systems: Theory, Implementation, and Application provides an overview of microphone array technology with applications in noise source identification and sound field visualization. In the comprehensive treatment of microphone arrays, the topics covered include an introduction to the theory, far-field and near-field array signal processing algorithms, practical implementations, and common applications: vehicles, computing and communications equipment, compressors, fans, and household appliances, and hands-free speech. The author concludes with other emerging techniques and innovative algorithms. Encompasses theoretical background, implementation considerations and application know-how Shows how to tackle broader problems in signal processing, control, and transudcers Covers both farfield and nearfield techniques in a balanced way Introduces innovative algorithms including equivalent source imaging (NESI) and high-resolution nearfield arrays Selected code examples available for download for readers to practice on their own Presentation slides available for instructor use A valuable resource for Postgraduates and researchers in acoustics, noise control engineering, audio engineering, and signal processing.

Download or read book Noise And Vibration Control Second Edition written by M L Munjal and published by World Scientific. This book was released on 2024-07-16 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique compendium stresses on physical concepts and the applications to practical problems. The authors' decades of experience in teaching, research and industrial consultancy are reflected in the choice of the solved examples and unsolved problems.The second edition has three additional chapters containing topics of vibration and acoustic sensors and instruments, finite element method (FEM), boundary element method (BEM) and statistical energy analysis (SEA), etc, thus enabling students to solve real-life problems in industrial and automotive noise control.The useful reference text targets senior undergraduate mechanical and environmental engineering students as well as designers of industrial machinery and layouts. The book can readily be used for self-study by practicing designers and engineers. Mathematical derivations are avoided and illustrations, tables and empirical formulae are included for ready reference.

Download or read book Design Methodology for Future Products written by Dieter Krause and published by Springer Nature. This book was released on 2021-12-13 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design Methodology for Future Products – Data Driven, Agile and Flexible provides an overview of the recent research in the field of design methodology from the point of view of the members of the scientific society for product development (WiGeP - Wissenschaftliche Gesellschaft für Produktenwicklung e.V.). This book aims to contribute to design methods and their implementation for innovative future products. The main focus is the crucial data-driven, agile, and flexible way of working. Four topics are covered in corresponding chapters, Methods for Product Development and Management, Methods for Specific Products and Systems, Facing the Challenges in Product Development and Model-Based Engineering in Product Development. This publication starts with the agile strategic foresight of sustainable mechatronic and cyber-physical systems, moves on to the topics of system generation engineering in development processes, followed by the technical inheritance in data-driven product development. Product improvements are shown via agile experiential learning based on reverse engineering and via combination of usability and emotions. Furthermore, the development of future-oriented products in the field of biomechatronic systems, sustainable mobility systems and in situ sensor integration is shown. The overcoming of challenges in product development is demonstrated through context-adapted methods by focusing on efficiency and effectiveness, as well as designer-centered methods to tackle cognitive bias. Flow design for target-oriented availability of data and information in product development is addressed. Topics of model-based systems engineering are applied to the function-driven product development by linking model elements at all stages and phases of the product. The potential of model-based systems engineering for modular product families and engineering of multidisciplinary complex systems is shown.

Download or read book Critical Technologies Plan written by and published by . This book was released on 1989 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Noise written by Anna Schwarz and published by Springer Science & Business Media. This book was released on 2009-06-17 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: November, 2008 Anna Schwarz, Johannes Janicka In the last thirty years noise emission has developed into a topic of increasing importance to society and economy. In ?elds such as air, road and rail traf?c, the control of noise emissions and development of associated noise-reduction techno- gies is a central requirement for social acceptance and economical competitiveness. The noise emission of combustion systems is a major part of the task of noise - duction. The following aspects motivate research: • Modern combustion chambers in technical combustion systems with low pol- tion exhausts are 5 - 8 dB louder compared to their predecessors. In the ope- tional state the noise pressure levels achieved can even be 10-15 dB louder. • High capacity torches in the chemical industry are usually placed at ground level because of the reasons of noise emissions instead of being placed at a height suitable for safety and security. • For airplanes the combustion emissions become a more and more important topic. The combustion instability and noise issues are one major obstacle for the introduction of green technologies as lean fuel combustion and premixed burners in aero-engines. The direct and indirect contribution of combustion noise to the overall core noise is still under discussion. However, it is clear that the core noise besides the fan tone will become an important noise source in future aero-engine designs. To further reduce the jet noise, geared ultra high bypass ratio fans are driven by only a few highly loaded turbine stages.

Download or read book Towards Sustainable Customization Bridging Smart Products and Manufacturing Systems written by Ann-Louise Andersen and published by Springer Nature. This book was released on 2021-10-31 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features state-of-the-art contributions from two well-established conferences: Changeable, Agile, Reconfigurable and Virtual Production Conference (CARV2020) and Mass Customization and Personalization Conference (MCPC2020). Together, they focus on the joint design, development, and management of products, production systems, and business for sustainable customization and personalization. The book covers a large range of topics within this domain, ranging from industrial success factors to original contributions within the field.

Download or read book Human Interaction Emerging Technologies and Future Systems V written by Tareq Ahram and published by Springer Nature. This book was released on 2021-09-09 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on research and developments in human–technology interaction. A special emphasis is given to human–computer interaction and its implementation for a wide range of purposes such as health care, aerospace, telecommunication, and education, among others. The human aspects are analyzed in detail. Timely studies on human-centered design, wearable technologies, social and affective computing, augmented, virtual and mixed reality simulation, human rehabilitation, and biomechanics represent the core of the book. Emerging technology applications in business, security, and infrastructure are also critically examined, thus offering a timely, scientifically grounded, but also professionally oriented snapshot of the current state of the field. The book gathers contributions presented at the 5th International Conference on Human Interaction and Emerging Technologies (IHIET 2021, August 27–29, 2021) and the 6th International Conference on Human Interaction and Emerging Technologies: Future Systems (IHIET-FS 2021, October 28–30, 2021), held virtually from France. It offers a timely survey and a practice-oriented reference guide to researchers and professionals dealing with design, systems engineering, and management of the next-generation technology and service systems.

Download or read book Digital Holography written by Pascal Picart and published by John Wiley & Sons. This book was released on 2013-01-24 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a substantial description of the principles and applications of digital holography. The first part of the book deals with mathematical basics and the linear filtering theory necessary to approach the topic. The next part describes the fundamentals of diffraction theory and exhaustively details the numerical computation of diffracted fields using FFT algorithms. A thorough presentation of the principles of holography and digital holography, including digital color holography, is proposed in the third part. A special section is devoted to the algorithms and methods for the numerical reconstruction of holograms. There is also a chapter devoted to digital holographic interferometry with applications in holographic microscopy, quantitative phase contrast imaging, multidimensional deformation investigations, surface shape measurements, fluid mechanics, refractive index investigations, synthetic aperture imaging and information encrypting. Keys so as to understand the differences between digital holography and speckle interferometry and examples of software for hologram reconstructions are also treated in brief. Contents 1. Mathematical Prerequisites. 2. The Scalar Theory of Diffraction. 3. Calculating Diffraction by Fast Fourier Transform. 4. Fundamentals of Holography. 5. Digital Off-Axis Fresnel Holography. 6. Reconstructing Wavefronts Propagated through an Optical System. 7. Digital Holographic Interferometry and Its Applications. Appendix. Examples of Digital Hologram Reconstruction Programs

Download or read book Vibration And Acoustics written by C. Sujatha and published by Tata McGraw-Hill Education. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibrations and Acoustics: Measurement and Signal Analysis is the culmination of the author's more than two decades of teaching and research experience in these areas. It will serve as a source of reference for postgraduate students, researchers, academicians, practicing engineers and professionals in the field of vibration and acoustics.

Download or read book 2021 International Symposium on Computer Science and Intelligent Controls ISCSIC written by IEEE Staff and published by . This book was released on 2021-11-12 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference facilitates the exchange of ideas in topics in the subareas of the Computer Science and Intelligent Control, which fit within the IEEE Computer Society s fields of interest