Développement des techniques optiques et acoustiques de mesure de champs orientées vers la vibroacoustique PDF Download
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Author: Ioana Theodora Nistea
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
L'utilisation des techniques de mesure optiques impose un choix, souvent difficile, entre la résolution temporelle et la résolution spatiale. L'interferométrie Speckle (IS) fournit des mesures des champs d'amplitudes de vibration de grande résolution spatiale, mais la résolution temporelle des mesures est réduite par les cadences d'acquisition des détecteurs. La thèse est dédiée au développement d'un système interférométrique adapté à la mesure des vibrations et des phénomènes dynamiques des structures, basé sur les principes de l'IS, mais ayant une résolution temporelle accrue. Le système a été testé à des cadences de plus de 26000 images/s pour les cas suivants : sollicitation harmonique mono-fréquence ou par une forme d'onde arbitraire ; sollicitation dynamique par une séquence d'échelons de force ; choc mécanique. Les essais ont démontré que le système est capable de dépasser les systèmes classiques d'IS à laser continu en ce qui concerne la mesure des phénomènes dynamiques.
Author: Ioana Theodora Nistea
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
L'utilisation des techniques de mesure optiques impose un choix, souvent difficile, entre la résolution temporelle et la résolution spatiale. L'interferométrie Speckle (IS) fournit des mesures des champs d'amplitudes de vibration de grande résolution spatiale, mais la résolution temporelle des mesures est réduite par les cadences d'acquisition des détecteurs. La thèse est dédiée au développement d'un système interférométrique adapté à la mesure des vibrations et des phénomènes dynamiques des structures, basé sur les principes de l'IS, mais ayant une résolution temporelle accrue. Le système a été testé à des cadences de plus de 26000 images/s pour les cas suivants : sollicitation harmonique mono-fréquence ou par une forme d'onde arbitraire ; sollicitation dynamique par une séquence d'échelons de force ; choc mécanique. Les essais ont démontré que le système est capable de dépasser les systèmes classiques d'IS à laser continu en ce qui concerne la mesure des phénomènes dynamiques.
Author: Jérôme Molimard
Publisher: John Wiley & Sons
ISBN: 1119292328
Category : Science
Languages : en
Pages : 138
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Book Description
From the characterization of materials to accelerated life testing, experimentation with solids and structures is present in all stages of the design of mechanical devices. Sometimes only an experimental model can bring the necessary elements for understanding, the physics under study just being too complex for an efficient numerical model. This book presents the classical tools in the experimental approach to mechanical engineering, as well as the methods that have revolutionized the field over the past 20 years: photomechanics, signal processing, statistical data analysis, design of experiments, uncertainty analysis, etc. Experimental Mechanics of Solids and Structures also replaces mechanical testing in a larger context: firstly, that of the experimental model, with its own hypotheses; then that of the knowledge acquisition process, which is structured and robust; finally, that of a reliable analysis of the results obtained, in a context where uncertainty could be important.
Author: Joseph Rosen
Publisher: BoD – Books on Demand
ISBN: 953307227X
Category : Computers
Languages : en
Pages : 470
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Book Description
Holography has recently become a field of much interest because of the many new applications implemented by various holographic techniques. This book is a collection of 22 excellent chapters written by various experts, and it covers various aspects of holography. The chapters of the book are organized in six sections, starting with theory, continuing with materials, techniques, applications as well as digital algorithms, and finally ending with non-optical holograms. The book contains recent outputs from researches belonging to different research groups worldwide, providing a rich diversity of approaches to the topic of holography.
Author: Abdelkhalak El Hami
Publisher: ISTE Press - Elsevier
ISBN: 1785481894
Category : Technology & Engineering
Languages : en
Pages : 274
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Book Description
Mechatronics brings together computer science, mechanics and electronics. It enables us to improve the performances of embedded electronic systems by reducing their weight, volume, energy consumption and cost. Mechatronic equipment must operate without failure throughout ever-increasing service lives. The particularly severe conditions of use of embedded mechatronics cause failure mechanisms which are the source of breakdowns. Until now, these failure phenomena have not been looked at with enough depth to be able to be controlled. Embedded Mechatronic Systems 1, Second Edition presents two methodologies: the statistical approach to the design optimization by reliability and the experimental approach for the characterization of the development of mechatronic systems in operating mode. It also analyzes new analysis tools on the effects of thermal, vibratory, humidity, electric and electromagnetic stresses. Presents a statistical approach to the design optimization by reliability It presents an experimental approach for the characterization of the development of mechatronic systems in operating mode The book analyzes new analysis tools on the effects of thermal, vibratory, humidity, electric and electromagnetic stresses
Author: Abdelkhalak El Hami
Publisher: ISTE Press - Elsevier
ISBN: 9781785480140
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
In operation, mechatronics embedded systems are stressed by loads of different causes: climate (temperature, humidity), vibration, electrical and electromagnetic. These stresses in components induce failure mechanisms should be identified and modeled for better control. AUDACE is a collaborative project of the cluster Mov'eo that address issues specific to mechatronic reliability embedded systems. AUDACE means analyzing the causes of failure of components of mechatronic systems onboard. The goal of the project is to optimize the design of mechatronic devices by reliability. The project brings together public sector laboratories that have expertise in analysis and modeling of failure, major groups of mechatronics (Valeo and Thales) in the automotive and aerospace and small and medium enterprises that have skills in characterization and validation tests.
Author: Vladimir I︠A︡kovlevich Katkovnik
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Computers
Languages : en
Pages : 584
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Book Description
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.
Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070
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Book Description
Author: Perry Eugene Howard
Publisher:
ISBN:
Category : Fertilizer industry
Languages : en
Pages : 26
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Book Description
In this publication is given a brief description of the production of commercial fertilizer. It is believed that this description, which complex technical discussion and statistics are avoided, will be of use to students, as well as farmers and gardeners.
