Download or read book tude th orique et num rique de la fatigue vibratoire written by Xiangan Kong and published by . This book was released on 1987 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous nous intéressons dans ce travail à une étude théorique et numérique de la fatigue vibratoire à haute fréquence. Nous abordons ce problème comme étant un problème de structure sollicitée en thermoélasticité dynamique couplée. Aprés avoir rapplé dans le premier chapitre les équations d'ondes thermoélastiques dans un milieu continu ainsi que les milieux fissurés (singularité), nous présentons dans le deuxième chapitre une formation variationnelle du problème pour des structures planes pouvant contenir une fissure fixe. Le calcul numèrique de ce problème d'évolution par la méthode des éléments finis fait l'objet du chapitre 3 pour la résolution temporelle, et du chapitre 4 pour la résolution dans l'espace des fréquences (transformée de Fourier). Le chapitre 5 contient, quant à lui, des structures en l'Udimet 500 avec comparaison à des résultats expérimentaux obtenus par ailleurs.
Download or read book Mechanical Vibration and Shock Analysis Specification Development written by Christian Lalanne and published by John Wiley & Sons. This book was released on 2010-01-05 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical Vibration and Shock Analysis, Second Edition Volume 5: Specification Development This volume focuses on specification development in accordance with the principle of tailoring. Extreme response and the fatigue damage spectra are defined for each type of stress (sinusoidal vibration, swept sine, shock, random vibration, etc.). The process for establishing a specification from the life cycle profile of the equipment which will be subject to these types of stresses is then detailed. The analysis takes account of the uncertainty factor, designed to cover uncertainties related to the real-world environment and mechanical strength, and the test factor, which takes account of the number of tests performed to demonstrate the resistance of the equipment. The Mechanical Vibration and Shock Analysis five-volume series has been written with both the professional engineer and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and extremely significant areas of mechanical engineering, from both a theoretical and practical point of view. The five volumes cover all the necessary issues in this area of mechanical engineering. The theoretical analyses are placed in the context of both the real world and the laboratory, which is essential for the development of specifications.
Download or read book Caract risation et tude des vibrations dans la pratique sportive written by Robin Trama and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La course à pied et les différentes pratiques sportives induisent des chocs et des vibrations transitoires au niveau des tissus mous à chaque impact. Ces impacts et vibrations peuvent générer un stress mécanique important, qui accroit le risque de fatigue et de blessure de sur-sollicitation. Le premier objectif de la thèse était consacré au développement de méthodes de traitement du signal d'accélération et d'analyse statistique afin de mieux caractériser les impacts et vibrations subies par le sportif. Le second objectif était de définir les facteurs externes, tels que le type de mouvement, le matériel sportif, ou la fatigue neuromusculaire, qui faisaient varier le comportement vibratoire en pratique écologique. Avec le développement de méthodes de traitement du signal (transformée en ondelettes continue) et statistiques (Statistical Parametric Mapping), nous avons montré que la vibration des tissus mous était différente de la vibration musculaire. Ainsi, les accéléromètres ne permettaient de caractériser que partiellement la vibration du muscle par rapport à une échographe ultra rapide. De plus, l'augmentation de la vitesse de course et les mouvements effectués lors de la pratique de sports collectifs génèrent des impacts à plus grande amplitude et à plus haute fréquence, ainsi que des vibrations des tissus mous plus amples que la course en ligne droite. Parmi le matériel sportif évalué, seul un revêtement sportif coulissant a permis de réduire l'amplitude de l'impact au sol. Une identification du type de mouvement a été rendu possible grâce à la mesure des impacts et l'usage d'un réseau de neurones convolutifs, permettant de franchir une première étape dans l'évaluation de la dose vibratoire subie par un sportif lors de sa pratique. Enfin, une étude réalisée lors des courses de l'UTMB a permis d'observer une stratégie de protection de l'organisme après des efforts de type trail en diminuant l'amplitude et la fréquence des vibrations des muscles les plus sollicités. Il reste nécessaire d'améliorer la caractérisation de la vibration musculaire avec des accéléromètres fixés sur la peau et de déterminer l'effet de l'exposition répétée à des vibrations transitoires sur le système neuromusculaire et musculo-squelettique.
Download or read book Fatigue Prediction Model of Vibration Strain Signals with Neuro Fuzzy Parameters for Durability Assessment written by Chin Chuin Hao and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibration and Wear in High Speed Rotating Machinery written by Júlio M. Montalvão e Silva and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute on Vibration and Wear Damage in High Speed Rotating Machinery, Tróia, Sebútal, April 10-22, 1989
Download or read book Vibration Effects on the Hand and Arm in Industry written by A. J. Brammer and published by Wiley-Interscience. This book was released on 1982 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Low cycle Constant frequency Vibration Fatigue Tests written by Edward A. English and published by . This book was released on 1964 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Natural Frequency of Vibration with Approaching Fatigue Failure written by Kenneth F. Paulovich and published by . This book was released on 1943 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Vibration Exposure on Muscle Fatigue and Manual Dexterity written by Diane Elizabeth Adamo and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Vibration Shock Specification development written by Christian Lalanne and published by . This book was released on 2002 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Inherent Variation in Fatigue Damage Resulting from Random Vibration written by William David Mark and published by . This book was released on 1961 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mod lisation et simulation num riques en formage virtuel written by SAANOUNI Khemais and published by Lavoisier. This book was released on 2012-04-16 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage fait le point sur les méthodes actuelles les plus performantes pour modéliser, simuler et optimiser les procédés de mise en forme des structures minces et massives et d'en donner les tendances des nouvelles méthodes innovantes actuellement en cours de développement et qui feront à n'en pas douter les "outils" industriels de demain dans le domaine du formage virtuel. Par rapport aux ouvrages récents dédiés aux méthodes numériques en mise en forme, le principal apport de ce livre se trouve rassemblé au deuxième chapitre qui concerne le développement des modèles de comportement multiphysiques à fortes capacités prédictives, utilisables dans les codes de calcul des structures pour simuler et optimiser tous types de procédés de mise en forme par grandes déformations irréversibles de structures métalliques minces et/ou massives et leur "optimisation" vis-à-vis de l'avènement de l'endommagement ductile.
Download or read book Fatigue Damage Accumulation Due to Complex Random Vibration Environments written by Mark Edward Paulus and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Specification Development written by Christi Lalanne and published by CRC Press. This book was released on 2002-05-24 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: About the Series This important new series of five volumes has been written with both the professional engineers and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and crucially important areas of mechanical engineering, from both the theoretical and practical standpoints. As all products need to be designed to withstand the environmental conditions to which they are likely to be subjected, prototypes must be verified by calculation and laboratory tests, the latter according to specifications from national or international standards. The concept of tailoring the product to its environment has gradually developed whereby, from the very start of a design project, through the to the standards specifications and testing procedures on the prototype, the real environment in which the product being tested will be functioning is taken into account. The five volumes of Mechanical Shock and Vibration cover all the issues that need to be addressed in this area of mechanical engineering. The theoretical analyses are placed in the context of the real world and of laboratory tests - essential for the development of specifications. Volume V: Specification Development This volume is concerned with the presentation of specification development in accordance with the principle of tailoring. Extreme response and the fatigue damage spectra are defined for each type of stress (sinusoidal vibration, swept sine, shock, random vibration, etc). The process for establishing a specification from the life cycle profile of the equipment is then detailed, taking account of the uncertainty factor, designed to cover uncertainties related to the real environment and mechanical strength; and the test factor, which takes account of the number of tests performed to demonstrate the resistance of the equipment.
Download or read book Ariane 5 structures et technologies written by and published by Editions-Cepadues. This book was released on 1993 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Revue G n rale Nucl aire written by and published by . This book was released on 2007 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
