Bibliographies thématiques / Vibration continue

Littérature scientifique sur le sujet « Vibration continue »

Auteur : Grafiati
Publié le 25 mai 2024

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Articles de revues sur le sujet "Vibration continue"

1

Abbas, Abbas Fadhil, et Adawiya Ali Hamzah. « Studying the Thermal Influence on the Vibration of Rotating Blades ». Measurement Science Review 22, no 2 (12 mars 2022) : 65–72. http://dx.doi.org/10.2478/msr-2022-0008.

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Abstract Computing the vibrating characteristics of any machine or structure is a necessary process that should be performed by the mechanical engineers that work in engineering design field to avoid the collapse under different kinds of applied loads. One of these kinds of structures are the rotating blades, whereas this part is considered as an essential element in many rotating systems that are used in different fields of engineering, e.g., turbomachinery, turbofan, helicopters, etc. One of the biggest disadvantages that is realized in rotating blades is failure due to vibrations and unbalance. It is possible that vibrations significantly reduce the performance of rotating blades compared to standard design conditions. If these rotating blades continue to operate under these circumstances for sufficient time, then the status of these systems will be unstable. Finally, this will lead to collapse of the rotating blades. In this work, a new code was created from scratch, based on the finite element method, to determine the vibrational characteristics of the rotating blades, taking into consideration the effect of rotating speed and temperatures. The compound influence of thermal gradients and rotating speed on the vibrational response (frequencies) for different configurations of blade was studied deeply.
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Ren, Fushen, Baojin Wang et Suli Chen. « Nonlinear Modeling and Qualitative Analysis of Coupled Vibrations in a Drill String ». International Journal of Bifurcation and Chaos 28, no 10 (septembre 2018) : 1850119. http://dx.doi.org/10.1142/s0218127418501195.

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A coupled model for axial/torsional/lateral vibrations of the drill string is presented, in which the nonlinear dynamics and qualitative analysis method are employed to find out the key factors and sensitive zone for coupled vibration. The drill string is simplified as an equivalent shell under axial rotation. After dimensionless processing, the mathematical model for coupled axial/torsional/lateral vibrations of the drill string is obtained. The Runge–Kutta–Fehlberg method is employed for the numerical simulation, and the rules that govern the changing of the torsional and axial excitation are revealed. And the stability domains of the explicit Runge–Kutta method are analyzed. Furthermore, the suggestions for field applications are also presented. It is demonstrated by simulation results that the lateral/axial/torsional vibrations exist simultaneously and couple with each other. The system will obtain a stable period motion with an axial excitation zone before the coupled vibration in the three directions, and continue to increase the axial excitation to cause the coupled vibration easily. The torsional excitation of the drill string mainly contributes to the coupled vibration in the three directions when in a specific rotation speed zone. The system is more likely to obtain a periodic motion through adjusting the torsional excitation out of this zone.
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Wi, Daehan, et Angela A. Sodemann. « Exploring User Perception Challenges in Vibrotactile Haptic Display Using Resonant Microbeams under Contact with Skin ». Multimodal Technologies and Interaction 3, no 2 (28 mai 2019) : 38. http://dx.doi.org/10.3390/mti3020038.

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Resonant vibrotactile microbeams use the concept of resonance to excite the vibration of cantilever beams, which correspond to pixels of an image. The primary benefit of this type of tactile display is its potential for high resolution. This paper presents the concept of the proposed system and human skin contact experiments to explore user perception challenges related to beam vibration during skin contact. The human skin contact experiments can be described in five phases: dried skin contact to metal beam tips, wet and soaped skin contact to metal beam tips, skin contact with a constraint, normal force measurement, and skin contact to the tips of silicone rubber beams attached to metal beam tips. Experimental results are analyzed to determine in what cases of skin contact the beams stop vibrating. It is found that the addition of silicone rubber beams allows the primary metal beams to continue vibrating while in contact with skin. Thus, the vibration response of a metal beam with silicone rubber beams is investigated for the better understanding of the effect of silicone rubber beams on the metal beam vibration.
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Pathak, Prabhat, Jeongin Moon, Se-gon Roh, Changhyun Roh, Youngbo Shim et Jooeun Ahn. « Application of vibration to the soles reduces minimum toe clearance variability during walking ». PLOS ONE 17, no 1 (4 janvier 2022) : e0261732. http://dx.doi.org/10.1371/journal.pone.0261732.

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Minimum toe clearance (MTC) is an important indicator of the risk of tripping. Aging and neuromuscular diseases often decrease MTC height and increase its variability, leading to a higher risk of tripping. Previous studies have developed visual feedback-based gait training systems to modify MTC. However, these systems are bulky and expensive, and the effects of the training continue only for a short time. We paid attention to the efficacy of vibration in decreasing the variability of gait parameters, and hypothesized that proper vibration applied to soles can reduce the MTC variability. Using shoes embedded with active vibrating insoles, we assessed the efficacy of both sub- and supra-threshold vibration in affecting MTC distribution. Experiment results with 17 young and healthy adults showed that vibration applied throughout the walking task with constant intensity of 130% of sensory threshold significantly decreased MTC variability, whereas sub-threshold vibration yielded no significant effect. These results demonstrate that a properly designed tactile sensory input which is controlled and delivered by a simple wearable device, the active insole, can reduce the MTC variability during walking.
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Liu, Jiantao, et Xiaoxiang Yang. « Learning to See the Vibration : A Neural Network for Vibration Frequency Prediction ». Sensors 18, no 8 (2 août 2018) : 2530. http://dx.doi.org/10.3390/s18082530.

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Vibration measurement serves as the basis for various engineering practices such as natural frequency or resonant frequency estimation. As image acquisition devices become cheaper and faster, vibration measurement and frequency estimation through image sequence analysis continue to receive increasing attention. In the conventional photogrammetry and optical methods of frequency measurement, vibration signals are first extracted before implementing the vibration frequency analysis algorithm. In this work, we demonstrate that frequency prediction can be achieved using a single feed-forward convolutional neural network. The proposed method is verified using a vibration signal generator and excitation system, and the result compared with that of an industrial contact vibrometer in a real application. Our experimental results demonstrate that the proposed method can achieve acceptable prediction accuracy even in unfavorable field conditions.
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Hale, Michael, et Jesse Porter. « Validation Techniques for 6-DOF Vibration Data Acquisition ». Journal of the IEST 55, no 1 (1 octobre 2012) : 10–24. http://dx.doi.org/10.17764/jiet.55.1.27662m34h12v32p6.

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Multiple Degree of Freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. Determination of an input specification for such MDOF systems is critically dependent on properly acquired field data. Validation of field data will be discussed and demonstrated employing the same transformation tools used in both transformation-based 6-degree-of-freedom (6-DOF) vibration control and generalized MDOF vibration specification development (VSD).
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Hale, Michael. « A 6-DOF Vibration Specification Development Methodology ». Journal of the IEST 54, no 2 (1 octobre 2011) : 103–15. http://dx.doi.org/10.17764/jiet.54.2.j6tr2r787846931n.

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Multiple degree of freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. This paper concentrates on the often overlooked process of determination of an input specification for such MDOF systems. A pair of generalized six-degree-of-freedom (6-DOF) vibration specification development (VSD) techniques are proposed, discussed, and illustrated through an example.
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Younis, Adel, Fadi AlKhatib et Zuomin Dong. « Optimal Motorcycle Engine Mount Design Parameter Identification Using Robust Optimization Algorithms ». Algorithms 15, no 8 (3 août 2022) : 271. http://dx.doi.org/10.3390/a15080271.

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Mechanical vibrations have a significant impact on ride comfort; the driver is constantly distracted as a result. Volumetric engine inertial unbalances and road profile irregularities create mechanical vibrations. The purpose of this study is to employ optimization algorithms to identify structural elements that contribute to vibration propagation and to provide optimal solutions for reducing structural vibrations induced by engine unbalance and/or road abnormalities in a motorcycle. The powertrain assembly, swing-arm assembly, and vibration-isolating mounts make up the vibration-isolating system. Engine mounts are used to restrict transferred forces to the motorbike frame owing to engine shaking or road irregularities. Two 12-degree-of-freedom (DOF) powertrain motorcycle engine systems (PMS) were modeled and examined for design optimization in this study. The first model was used to compute engine mount parameters by reducing the transmitted load through the mounts while only considering shaking loads, whereas the second model considered both shaking and road bump loads. In both configurations, the frame is infinitely stiff. The mount stiffness, location, and orientation are considered to be the design parameters. The purpose of this study is to employ computational methods to minimize the loads induced by shaking forces. To continue the optimization process, Grey Wolf Optimizer (GWO), a meta-heuristic swarm intelligence optimization algorithm inspired by grey wolves in nature, was utilized. To demonstrate GWO’s superior performance in PMS, other optimization methods such as a Genetic Algorithm (GA) and Sequential Quadratic Programming (SQP) were used for comparison. To minimize the engine’s transmitted force, GWO was employed to determine the optimal mounting design parameters. The cost and constraint functions were formulated and optimized, and promising results were obtained and documented. The vibration modes due to shaking and road loads were decoupled for a smooth ride.
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Wei, Shuang. « Research on wind resistance principles and design of super high-rise buildings ». Applied and Computational Engineering 62, no 1 (20 mai 2024) : 7–14. http://dx.doi.org/10.54254/2755-2721/62/20240371.

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Due to the high and flexible characteristics of super high-rise buildings, the structure is very sensitive to wind loads, and wind vibration effects and comfort are issues that cannot be ignored in the structural design of super high-rise buildings. The paper mainly introduces the problems in wind resistance design of super high-rise buildings. Including wind load values, wind vibration effects, and vibration control methods and applications. The result show that the wind induced vibration effect and comfort of the structure are often determined through wind tunnel tests. For super high-rise buildings with complex structural forms. There are two methods for controlling wind-induced vibration in high-rise buildings: Optimizing structural form through architectural methods; Take structural control measures. At the same time, with the cost of high-performance materials and engineering technologies, it is a challenge to find building materials and technologies that can meet wind resistance requirements while keeping costs in check. However, as computational technology continues to evolve, the wind-resistant design of tall buildings will benefit from more accurate wind-tunnel simulations and computational modelling, which will help to better predict and address wind-resistance challenges. Scientists and engineers will continue to research novel materials and structural designs to improve the wind resistance of tall buildings and reduce costs.
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Matsuda, Toru, et Ryuta Tomita. « Study on vibration measurement and sensory evaluation of combined vibration for detached houses ». INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no 8 (30 novembre 2023) : 904–13. http://dx.doi.org/10.3397/in_2023_0143.

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Sensory and psychological content accounts for 90% of all vibration complaints in Japan. Therefore, evaluation based on vibration sensation is very important. Traffic vibration is the most common source of vibration that causes complaints, when limited to detached houses. If traffic vibration is the source of complaints, occupants will suffer from vibration for a long period of time. Vibration transmitted by traffic to housing floors may not be either vertical or horizontal, but rather a combination of both vertical and horizontal vibration that exceed perceptual thresholds. Japanese standards include "JIS C 1510" and "AIJES-V0001-2018". However, they do not describe methods for sensory evaluation of combined vibration. Although ISO 2631 series describes it, it is necessary to consider whether it can be applied to Japan as it is. Considering that traffic networks will continue to develop in Japan, especially in urban areas, it is assumed that the vibration generated inside houses, mainly from traffic vibration sources, will not be a single vibration of vertical or horizontal vibration, but a combined vibration that is perceived in multiple directions. Therefore, in this paper, vibration measurement and sensory evaluation of combined vibration were examined using a real house vibrated by traffic.
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Thèses sur le sujet "Vibration continue"

1

Le, Thien-Phu. « Auscultation dynamique des structures à l'aide de l'analyse continue en ondelettes ». Marne-la-vallée, ENPC, 2003. http://www.theses.fr/2003ENPC0023.

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Le, Tien-Phu. « Auscultation dynamique des structures à l'aide de l'analyse continue en ondelettes ». Phd thesis, Ecole des Ponts ParisTech, 2003. http://pastel.archives-ouvertes.fr/pastel-00000640.

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On étudie l'application de l'analyse continue en ondelettes à l'auscultation dynamique des structures à partir des réponses transitoires sous excitations imparfaitement connues (choc, ambiante...). L'outil numérique de la transformation continue en ondelettes est établi. Il est fondé sur l'ondelette mère (Morlet ou Cauchy) et sur un paramètre la caractérisant: le facteur Q de qualité du filtre. Il permet d'extraire les amplitudes et les fréquences instantanées contenues dans le signal. Un domaine du plan temps-fréquence où l'effet de bords est négligeable, et un encadrement de Q sont déterminés. Le traitement du signal réel modulé en amplitude et en fréquence par l'outil proposé facilite l'identification modale des structures (linéaires et non-linéaires) et permet une amélioration de la méthode impact-écho. Une procédure adaptée à chaque application est détaillée. Les résultats obtenus à partir des tests numériques et réels montrent l'efficacité de la méthode.
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Patlolla, Kiran Kumar. « Free vibration analysis : comparison between continuum mechanics and molecular mechanics models a thesis presented to the faculty of the Graduate School, Tennessee Technological University / ». Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1786737281&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268928551&clientId=28564.

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Wu, Xionghua. « Vibration of Planetary Gears Having an Elastic Continuum Ring Gear ». The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276524893.

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Subramaniam, Hari. « VIBRATION ANALYSIS OF CARBON NANOTUBE USING CONTINUUM MODEL AND FINITE ELEMENT MODEL ». Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2268.

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The main objective of the thesis is to propose the methods of determining vibration behavior of carbon nanotubes (CNTs) using continuum models and finite element models. Secondary objective is to find the effect of van der Waals force on vibration of multiwalled carbon nanotubes . The study of vibration behavior of CNTs is important because of their potential engineering applications such as nano-mechanical resonators and tips of scanning probe instruments where they are subjected to mechanical vibrations. Continuum modeling is based on an elastic beam model. The interlayer van der Waals interactions are represented by Lennard-Jones potential. In finite element modeling, single walled nanotubes (SWNTs) are modeled as finite beam elements and multi-walled nanotubes (MWNTs) as finite solid elements. The interlayer van der Waals interactions are simulated by distributed springs. The proposed finite element approach and continuum approach for vibration analysis of CNTs are verified by comparing the results with experimental and analytical results available in the literature. The results from both continuum and finite element modeling show that the effect of van der Waals force on vibration of MWNTs are high for smaller aspect ratios irrespective of boundary conditions and number of layers; fixed nanotube than cantilever nanotube for the same dimensions ; five-walled nanotube than a double walled nanotube for the same aspect ratio.
M.S.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering
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Lorée, Hugo. « Élastographie impulsionnelle : étude des artefacts et développement d’une méthode de guidage par ondes élastiques monochromatiques ». Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS446.

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La fibrose hépatique est une maladie chronique du foie en constante augmentation dans les pays industrialisés. Le degré de fibrose présente la particularité d’être directement corrélé à l’élasticité du foie. En quantifiant l’élasticité des tissus de manière non invasive, l’élastographie impulsionnelle fournit au praticien un outil de diagnostic majeur des maladies chroniques du foie. Couramment utilisée dans les services d’hépatologie, elle consiste à générer, à l’aide d’une sonde ultrasonore mono élément, une vibration impulsionnelle à la surface de la peau, qui va se propager dans les tissus sous forme d’une onde de cisaillement. Sa propagation est suivie en temps réel par ultrasons. Pour obtenir une mesure d’élasticité hépatique fiable, l’opérateur doit placer la sonde en regard d’une zone homogène du foie. Cette phase de localisation peut s’avérer difficile suivant l’expérience de l’opérateur, ou encore notamment lors de la mesure de patients obèses massifs.Deux axes majeurs ont été explorés au cours de cette thèse, d’une part pour améliorer l’applicabilité de l’examen sur patients obèses massifs, et d’autre part pour faciliter la localisation d’une zone de mesure optimale. Dans un premier temps, une étude des artefacts perturbant l’estimation de l’élasticité a été conduite sur simulations et in vitro. Ses résultats ont permis une meilleure compréhension de l’influence des artefacts les plus courants en élastographie impulsionnelle. Les résultats ont également conduit au développement de prototypes adaptés à la mesure du foie des patients obèses massifs. Dans un second temps, un outil de localisation a été développé pour aider l’opérateur à repérer une zone de mesure optimale. Enfin, les prototypes de sonde ainsi que la nouvelle méthode de localisation ont été testées dans le cadre d’un protocole clinique conduit à l’hôpital la Pitié-Salpêtrière sur des patients obèses massifs
The incidence of chronic liver diseases, and particularly liver fibrosis, is constantly growing in industrialized countries. Liver stiffness, which is a good surrogate marker to stage liver fibrosis, can be estimated noninvasively through transient elastography. This technique thus provides an important diagnosis tool to the specialists. Commonly used in hepatology, it consists in using a mono element ultrasound probe to generate a transient pulse at the surface of the skin that will propagate within the liver as a shear wave. Its propagation is tracked in real time using ultrafast ultrasound pulses. In order to obtain a reliable liver stiffness estimation, the probe has to be placed in front of a homogeneous region of the liver. This localization phase may be difficult depending on the experience of the operator, and the morphology of the patient, with obese patients being particularly difficult to measure.In this thesis, a first axis of research was dedicated to improve the applicability of transient elastography on massively obese patients. A second focus of research aimed at facilitating the localization of an optimal measurement window. First, the artefacts disturbing the stiffness estimation were studied through simulations and in vitro studies. It led to a better understanding of the influence of the most common artifacts in transient elastography and to the manufacturing of probe prototypes adapted to measuring massively obese patients. Secondly, a liver localization tool has been developed in order to help the operator detect an optimal measurement window. Lastly, the probe prototypes as well as the liver localization tool were tested on massively obese patients during a clinical trial carried out at the hospital la Pitié-Salpêtrière
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Ricci, Laurent. « Modélisations discrètes et continues des voies ferrées ballastées ». Phd thesis, Ecole des Ponts ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00003422.

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Devant la dégradation plus rapide que prévue des voies ferrées ballastées aux grandes vitesses, la SNCF a engagé des recherches en collaboration avec le LCPC. L'objectif était de pouvoir indiquer, en fonction de la vitesse et de la nature du sol, le tassement associé de la voie ferrée ballastée. Le travail s'est déroulé en deux parties : la première ([ALSHAER 2005]), consistait à rechercher une loi de tassement expérimentale en fonction de l'accélération présente dans la voie ; la seconde (notre thèse) avait pour but d'élaborer un modèle de voie dynamique permettant, en fonction de la vitesse et de la nature du sol, de donner la valeur de l'accélération verticale maximale. Nous avons développé des approches dynamiques d'abord semi-analytiques linéaires multi-couches, puis numériques non-linéaires (développements dans le code CESAR-LCPC). En comparant leurs résultats aux mesures expérimentales, on a pu sélectionner les lois de comportement adaptées, et un modèle de voie ferrée.
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Porfiri, Maurizio. « Performances of passive electric networks and piezoeletric transducers for beam vibration control ». Toulon, 2005. http://www.theses.fr/2005TOUL0015.

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Cette thèse est concentrée sur le contrôle de vibration des poutres par l'utilisation des transducteurs piézoélectriques et des circuits électriques passifs. La première partie de cette étude traite de la modélisation et de l'analyse des poutres piézoélectriques segmentées. Un modèle unidimensionnel raffiné est dérivé et est validé par une installation expérimentale. Les propriétés modales sont étudiées avec quatre méthodes numériques. Un modèle homogénéisé des poutres piézoélectriques segmentées périodiques est dérivé en employant une convergence à deux échelles. La deuxième partie traite de l'analyse des performances de trois circuits passifs pour atténuer les vibrations structurales: le shuntage piézoélectrique, la ligne de transmission du deuxième ordre et la ligne de transmission du quatrième ordre. Les effets des incertitudes des paramètres électriques sur les performances du système sont analysés. Les prévisions théoriques sont validées par différents installations expérimentales
This thesis is focused on beam vibration control using piezoelectric transducers and passive electric networks. The first part of this study deals with the modeling and the analysis of stepped piezoelectric beams. A refined one-dimensional model is derived and experimentally validated. The modal properties are determined with four numerical methods. A homogenized model of stepped periodic piezoelectric beams is derived by using two-scale convergence. The second part deals with the performance analysis of three passive circuits in damping structural vibrations: the piezoelectric shunting, the second order transmission line and the fourth order transmission line. The effects of uncertainties of the electric parameters on the system performances are analyzed. Theoretical predictions are validated through different experimental setups
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Ngwangwa, Harry Magadhlela. « Assessment of structural damage using operational time responses ». Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-01312006-141711.

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Najm, Désirée. « Quels capteurs de vibrations pour la surveillance de santé des structures mécaniques ? » Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1072/document.

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La thèse a pour objectif de définir les principes et les approches d’une mise en œuvre pratique des capteurs de vibrations pour l’évaluation dynamique des structures, notamment la détection d’endommagements. L’idée générale est d’étudier les combinaisons instrumentation/méthode de détection. Ainsi, une étude numérique de sensibilité de différentes méthodes de détection et de localisation d’endommagement utilisant les paramètres modaux (essentiellement fréquences propres et déformées modales) a été réalisée en fonction du type de capteur utilisé, du nombre de capteurs, de la sévérité du défaut et de la dispersion des paramètres modaux. Le cas d’application choisi est celui d’une poutre en aluminium bi-encastrée. Un panorama des capacités de chacune des méthodes pour l’évaluation dynamique des ouvrages a ainsi pu être dressé. Dans l’ensemble, l’application des méthodes de détection d’endommagement a fourni de meilleurs résultats à partir de jauges de longue base de mesure. Une méthode développée au sein de l’équipe Dynamique, appliquée numériquement et expérimentalement, a également permis de localiser un défaut de masse et/ou de rigidité ainsi que de quantifier ces changements
The aim of the thesis is to define principles and approaches of a practical implementation of vibration sensors for dynamic monitoring of structures, specially damage detection. The general idea is to study the combinations instrumentation /detection method. Thus, a numerical sensitivity study of different damage detection and localization methods using modal parameters (mainly natural frequencies and mode shapes) was performed according to the type of sensor used, to the number of sensors, to the severity of the damage, and to dispersion of modal parameters. The case-study is conducted on an aluminium clamped-clamped beam. A panorama of the capacity of each method for dynamic assessment of structures has been presented. Overall, long base strain gauges provide better results for damage detection methods. A method developed in the Dynamic group applied to numerical and experimental data, is able to locate mass and/or flexural rigidity modifications and to quantify these perturbations
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Livres sur le sujet "Vibration continue"

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Leissa, Arthur W. Vibrations of continuous systems. New York : McGraw-Hill, 2011.

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Reuter, Christoph. Modeling aspects for the vibration and dynamic stability of translating elastic continua. Homburg, Germany : Normed Verlag, 2000.

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3

Rosen, I. Gary. Spline-based Rayleigh-Ritz methods for the approximation of the natural modes of vibration for flexible beams with tip bodies. Hampton, Va : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1985.

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4

Zhongguo qi che gong cheng xue hui. Proceedings of the FISITA 2012 World Automotive Congress : Volume 5 : Advanced Transmission System and Driveline. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013.

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Guyader, Jean-Louis. Vibrations des milieux continus. HERMES SCIENCE, 2002.

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Guyader, Jean-Louis. Vibration in Continuous Media. Wiley & Sons, Incorporated, John, 2013.

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Vibration in Continuous Media. ISTE Publishing Company, 2006.

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Guyader, Jean-Louis. Vibration in Continuous Media. Wiley & Sons, Incorporated, John, 2013.

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Guyader, Jean-Louis. Vibration in Continuous Media. Wiley & Sons, Incorporated, John, 2013.

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Guyader, Jean-Louis. Vibration in Continuous Media. Wiley & Sons, Incorporated, John, 2013.

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Chapitres de livres sur le sujet "Vibration continue"

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Garrett, Steven L. « String Theory ». Dans Understanding Acoustics, 133–78. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_3.

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Abstract The vibrating string has been employed by nearly every human culture to create musical instruments. Although the musical application has attracted the attention of mathematical and scientific analysts since the time of Pythagoras (570 BC–495 BC), we will study the string primarily because its vibrations are easy to visualize and string vibrations introduce concepts and techniques that will recur throughout our study of the vibration and the acoustics of continua. In this chapter, we will develop continuous mathematical functions of position and time that describe the shape of the entire string. The amplitude of such functions will describe the transverse displacement from equilibrium, y(x, t), at all positions along the string. The importance of boundary conditions at the ends of strings will be emphasized, and techniques to accommodate both ideal and “imperfect” boundary conditions will be introduced. Solutions that result in all parts of the string oscillating at the same frequency which satisfy the boundary conditions are called normal modes, and the calculation of those normal mode frequencies will be a focus of this chapter.
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Dunlop, Rebecca, William L. Gannon, Marthe Kiley-Worthington, Peggy S. M. Hill, Andreas Wessel et Jeanette A. Thomas. « Vibrational and Acoustic Communication in Animals ». Dans Exploring Animal Behavior Through Sound : Volume 1, 389–417. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97540-1_11.

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AbstractAn introduction to acoustic and vibrational communication in animals is presented in this chapter. Starting with the origins of communication and ritualization of vocal and vibrational signals to produce a clear message or broadcast. A summary of communication concepts is presented describing behaviors such as displays. The chapter continues by unraveling some of the complexities of acoustic and vibrational communication such as elephant vibration detection posture and reception of long-range vibrational signal production—or drumming—in Prairie chickens and Kangaroo rats. We discuss the advantages of vibrational and acoustic signal production signals as well as the disadvantages including the influence of environmental factors that may mask or attenuate signals such as wind, water, or structural clutter. Research on the informational content of these signals is progressing. We provide a summary of ground-breaking earlier work, an indication of where we believe the field is now, and a glimpse of where we believe the field could be going in the future. The chapter concludes with a discussion of the characteristics of human language and whether nonhuman animals have such a language with the accompanying mental abilities. It could just be that other animals are most entertained (and threatened!) by our signaling behaviors.
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Anselmet, Fabien, et Pierre-Olivier Mattei. « Elements of Continuum Mechanics ». Dans Acoustics, Aeroacoustics and Vibrations, 9–30. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch2.

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Gaudenzi, Paolo. « Finite Element Models for Piezoelectric Continua ». Dans Responsive Systems for Active Vibration Control, 181–205. Dordrecht : Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0483-1_6.

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Algermissen, Stephan, Björn T. Kletz et Martin Pohl. « Active Control of Vibration, Applications of ». Dans Encyclopedia of Continuum Mechanics, 1–10. Berlin, Heidelberg : Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53605-6_246-1.

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Algermissen, Stephan, Björn T. Kletz et Martin Pohl. « Active Control of Vibration, Applications of ». Dans Encyclopedia of Continuum Mechanics, 13–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-55771-6_246.

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Le, Khanh Chau. « Vibrations of Rods and Beams ». Dans Encyclopedia of Continuum Mechanics, 1–8. Berlin, Heidelberg : Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53605-6_54-1.

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Le, Khanh Chau. « Vibrations of Rods and Beams ». Dans Encyclopedia of Continuum Mechanics, 2680–88. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-55771-6_54.

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Yang, B., et C. D. Mote. « Active Vibration Control of Axially Moving Continua ». Dans Solid Mechanics and Its Applications, 359–402. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-1903-2_10.

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Palmov, Vladimir. « Foundations and equations of continuum mechanics ». Dans Vibrations of Elasto-Plastic Bodies, 13–86. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-540-69636-0_1.

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Actes de conférences sur le sujet "Vibration continue"

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Minaev, Andrey. « INNOVATIVE TECHNOLOGIES IN SPORTS VIBRATION BIOMECHANICS ». Dans VII All-Russian scientific and practical conference with international participation "Sports Informatics Day". Russian Association of Computer Science in Sports, 2024. http://dx.doi.org/10.62105/2949-6349-2024-1-s1-57-60.

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IIn all sports, where a successful result is achieved by obtaining high projectile speeds when interacting with an athlete, shock and vibration loads occur. The study of issues arising in the vibrational biomechanics of sports equipment will always be an urgent and in-demand area in sports scientific engineering. Based on high innovative technologies, including those related to the processes of transmission, analysis and evaluation of information using computer technology, it is convenient to obtain the vibration characteristics of projectiles in various situations using test benches. Shock, vibration stands, as well as field tests for recording dynamic characteristics (bending, torsional vibrations) of various models of sports equipment will be constantly improved. On laboratory test benches, both the velocity of the projectile and the rate of damping of the resulting vibrations are determined, the analysis of vibration attenuation decrements and other dynamic characteristics affecting the quality of the sports projectile and having a significant impact on the result obtained by the athlete. The analysis of information data records obtained from vibration sensors with the construction of amplitude-frequency characteristics, based on the test results, allows us to determine both the most high-speed sports equipment, both a biomechanical system, and a projectile with reduced vibrations and the best vibration damping properties. Information, digital and all other technologies, including those related to the development of innovative composite materials, continue to develop, the study of vibrational biomechanics of sports equipment will also continue to develop and play an important role in the development of increasingly advanced sports equipment that will further push the boundaries of human capabilities.
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Prasad, Piyush, Sudhanshu Poddar et Finlay Casey. « Vibration Assessment of Thermowells ». Dans ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93467.

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Abstract ASME PTC 19.3 2016 code does not provide clear guideline on how to deal with the vibration problems of existing thermowells that are currently in operation and may be operating near inline or transverse vibration zone. While the code allows passing through the in-line vibration zone, it prohibits operation completely in transverse vibration due to lock-in phenomenon. Once lock-in occurs, the thermowell gets into resonance and in the absence of adequate damping in the system, the thermowell vibration amplitude would keep on building with every cycle till eventual failure. It was identified that several operating assets had thermowells operating in the prohibited zone as per ASME PTC 19.3 and were facing a greater process safety risk. Damping though difficult to predict, plays very crucial role in amplitude when thermowell is operated in critical zone i.e. within 20% of natural frequency. Hence it is very important to estimate the damping factor. ASME PTC 19.3 2016 have suggested conservative damping factor (ζ) of 0.0005 based on the lab studies. The test set-up assumes the piping system as rigid component, whereas, in the field piping systems are flexible. Using a conservative damping in the stress calculations leads to a high fictitious stress indicating failure of the thermowell. In the present paper, a method is suggested to quantify the damping in the system by utilizing actual site vibration measurement of thermowell in the finite element analysis and thus a more realistic assessment of the stresses in the thermowell can be made. This assessment presented a much larger damping present in the system than ASME suggested and led asset to continue operate the plant with no risk of unplanned downtime as well as technical integrity of equipment. The results are presented for one sample thermowells.
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Tao, Tao, Isaac Amundson et Kenneth D. Frampton. « Decentralized Vibration Control With Networked Embedded Systems ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60735.

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The early promise of centralized active control technologies to improve the performance of large scale, complex systems has not been realized largely due to the inability of centralized control systems to “scale up”; that is, the inability to continue to perform well when the number of sensors and actuators becomes large. Now, recent advances in Micro-electro-mechanical systems (MEMS), microprocessor developments and the breakthroughs in embedded systems technologies, decentralized control systems may see these promises through. A networked embedded system consists of many nodes that possess limited computational capability, sensors, actuators and the ability to communicate with each other over a network. The aim of this decentralized control system is to control the vibration of a structure by using such an embedded system backbone. The key attributes of such control architectures are that they be scalable and that they be effective within the constraints of embedded systems. Toward this end, the decentralized vibration control of a simply supported beam has been implemented experimentally. The experiments demonstrate that the reduction of the system vibration is realized with the decentralized control strategy while meeting the embedded system constraints, such as a minimum of internode sensor data communication, robustness to delays in sensor data and scalability.
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Colvin, David P., et Richard A. McKinney. « Reduction in Body Vibration and Spinal Impact With HACS Cushioning ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82911.

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High vibration and impact injuries continue to cause problems for military and civilian personnel in aircraft, trucks and armored vehicles. Crashes in helicopters and fixed wing aircraft as well as repetitive impacts in armored vehicles and trucks over rough terrain can pose serious problems and potential injuries for their occupants. Protective seat cushions can be engineered to absorb or mitigate a significant fraction of the mechanical energy before it is transmitted to the body. It has been shown, however, that conventional foam seat cushions can actually increase the potential for injury by allowing the body accelerations to overshoot. On the other hand, new and novel designs for cushioning materials can significantly reduce the potential for injuries from whole body vibration as well as spinal impact by extending and altering the duration of the high energy mechanical pulse. Based on unique computer models and subsequent CAD/CAM designs, prototype HACS seat cushions were fabricated from elastomers of three different durometers that incorporated precision, lateral choked airflow passages molded into the cushioning material. Subsequent testing with the NAVY Crew System Horizontal Accelerator at Patuxent River Naval Air Station, MD showed that the novel HACS seat cushion was 40% more effective than any other conventional aircraft seat cushion for the reduction of lumbar spinal load transmission to crash test dummies of all sizes during 23g impact tests. In more recent testing for the AAAV armored vehicle program, HACS seat cushioning has been shown to reduce whole body vibration by 36%.
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Sankarankutty, Rahul, Sagi Rathna Prasad, Piyush Shakya et A. S. Sekhar. « Tacholess Instantaneous Speed Estimation of a Wind Turbine Gearbox Using Vibration Signals ». Dans ASME Turbo Expo 2023 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-103659.

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Abstract Early turbine component failures continue to be a problem in the wind energy sector with the gearbox being the costliest subcomponent to maintain. In this study, an in-house wind turbine experimental test rig has been designed to simulate the on-site transient wind speed and load conditions on a scaled-down 3-stage planetary gearbox. A total of 19 different wind profiles from commercial wind farms are validated from the measured vibration data using statistical performance criteria. Tracking the rotational speed, especially in a wind turbine gearbox operating in highly non-stationary environments, is extremely essential. Conventional speed measurement by tachometers or encoders is sensitive to random disturbances, and hence Instantaneous Angular Speed measurement from vibration signals is an alternate approach to estimating the instantaneous frequency of the system from accelerometer data. The present study compares different speed estimation methods based on phase demodulation and time-frequency approaches for their accuracy on various wind speed datasets. A new method is proposed, combining both the time-frequency and demodulation techniques. A performance comparison of the methods is done, and their results are compared with the data collected from an angular encoder.
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Boschitsch, Alexander, Pavel Danilov, Andrew Kaufman et Alan Bilanin. « Flow Induced Vibration Analysis and Remediation Using a Cartesian Grid Flow Solver ». Dans 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64842.

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Abstract Flow through pipe junctions produces unsteady vortex shedding processes that can generate acoustic pressures whose modal amplification contributes to structural fatigue. Such flow-induced vibration (FIV) is an enduring concern in nuclear power plants (NPPs) and has led to delays in extended power uprate licensing, produced strong fluctuating loads in piping, and contributed to cracks in low pressure turbine blades. Modern computational fluid dynamics (CFD) analysis can analyze FIV phenomena, but the practical challenges of setting up and adequately meshing multiple candidate designs continue to deter routine and reliable CFD-based FIV assessment. Recently, CFD solvers implemented on Cartesian grids and offering autonomous mesh generation about complex geometries have made significant strides in addressing these challenges. Here, the successful application of a CFD solver (CGE) used in combination with subscale testing to rectify FIV in NPP piping, is described. The article reviews the role of CFD in FIV analysis and design, summarizes the principal analysis components of CGE, outlines the 1/8th subscale testing program used in conjunction with CFD to assess FIV, and concludes with postinstallation assessments of the modification. The concepts contained here have helped address FIV in several NPPs resulting in significant reductions in operation & maintenance (O&M) costs.
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Shiraishi, Toshihiko, et Akitoshi Nishijima. « A Study of a Mechanism of Cell Proliferation Promotion of Cultured Osteoblasts by Mechanical Vibration ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87364.

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This paper describes a mechanism of cell proliferation promotion of cultured osteoblasts by mechanical vibration focusing on β-catenin. 12.5 Hz and 0.5 G mechanical vibration was reported to promote the cell proliferation of cultured osteoblasts in plane culture. That is because the mechanical vibration weakens cell-cell adhesion, promotes to pile up cells, and allows cells to form multilayer structure. However, it has not been clarified why cells continue cell division after their monolayer confluent state. Here we show that mechanical vibration not only weakens cell-cell adhesion bound by β-catenin but also promotes to move β-catenin from the cytoplasm to the nuclei, where β-catenin associates with DNA-binding members of the Tcf/LEF family and other associated transcription factors including cell division. After osteoblastic cells were cultured under 12.5 Hz and 0.5 G mechanical vibration, cells were fractionated into nuclear and cytoplasmic fractions using a centrifugation method. β-catenin in each fraction was detected by a western blot experiment. The protein bands from western blot films were quantified with an image processing and analysis software, ImageJ. As a result, the vibration group gave higher expression of β-catenin in nuclear fraction than the non-vibration group just after the vibration group reached the saturated cell density. It indicates that 12.5 Hz and 0.5 G mechanical vibration may promote to move β-catenin into the nuclei and the cell division.
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Aguiar, Romulo, Diogo Barreto, João Pedro Tocantins, Alex Barr, Laura Lima, Denis Li, Adriano Hemerly et al. « New Methods for Improving Drilling Performance : The Power of Digital Workflows ». Dans IADC/SPE International Drilling Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/208706-ms.

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Abstract After 10 years of Brazilian presalt exploration and development, the carbonate reservoirs continue to pose drilling challenges, leading to unwanted bottomhole assembly (BHA) trips due to severe shock and vibration, low rates of penetration (ROP), and premature drill-bit cutting structure damage. Today, industry efforts to improve the performance in the Brazilian presalt carbonates are driven by trial and error, which is very costly in the ultradeepwater drilling environment. The adoption of a collaborative mindset since 2012 between a service provider and operator with the desire to bring about a step change in drilling efficiency on the Brazilian presalt cluster enabled a systematic learning framework to capture, evaluate, and reuse knowledge from drilling dynamics, geological, and petrophysical aspects. The innovation of this work is the implementation of an improved, fully digital bit design workflow, integrating calibrated 4D dynamic simulation model and petrotechnical expertise from drilling engineering, geomechanics, geology, and petrophysics groups to continue to push the drilling performance envelope in the challenging Brazilian presalt application.
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Lall, Pradeep, Vikas Yadav, Jeff Suhling et David Locker. « Effect of Property Evolution of Doped and Undoped SnAgCu Solder Alloys Under Shock and Vibration ». Dans ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ipack2022-97452.

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Abstract Electronics may be required to operate in harsh environments in automotive, aerospace, and defense applications. Solder interconnects in harsh environments may be subjected to extremely-low and high temperatures in the range of −65C to +200C in conjunction with significant strain loads. Furthermore, electronic assemblies may be subjected to extended periods of non-climate-controlled storage prior to deployment. Prior studies have shown that lead-free solder materials continue to evolve under varied thermal loads, leading to deterioration in mechanical parameters such as Ultimate Tensile Strength and Elastic Modulus. The material characteristics for non-linear modeling and reliability prediction are required for risk minimization with the use of new alloy formulations in high-reliability applications. The current work fills this state-of-the-art gap by measuring the mechanical characteristics of undoped SAC105 and doped SAC-Q solder alloys at low operation temperatures (−65°C to 0°C) at high strain rate after varied thermal aging periods up to one year. In addition, the evolution of Anand parameters for SAC solder alloys after prolonged thermal aging has been studied. The Anand model’s reliability has been assessed by comparing experimentally observed data with forecasted data using determined model constants for both solder alloys. The Anand parameters were applied in a FE-framework to simulate drop events for a ball-grid array package on a printed circuit board assembly.
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Hesler, S. H., et C. A. Suprock. « Improving Turbomachinery Health Monitoring Using Advanced Shaft Telemetry System ». Dans ASME Turbo Expo 2017 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64899.

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Turbine-generator shaft systems used in power generation applications are exposed to degradation mechanisms that could result in high consequence failures if not discovered prior to damage accumulation. Grid-induced torsional vibration, growth of cracks in the shaft forging, and large blade vibration are some examples of degradation that remains unmonitored in most commercial plants today. In many cases, the sensing and subsequent trending of high-quality vibration data obtained directly from the shaft surface can be the basis for a decision to continue to operate versus inspect or repair. Detection of small changes in torsional and lateral vibration mode properties can be sensed at a single shaft location and trended using techniques such as Advanced Pattern Recognition to reveal the very early signs of rotor distress. Contemporary barriers to widespread application of wireless shaft vibration measurements for health monitoring were studied and addressed in the development of the Turbine Dynamics Monitoring System (TDMS). The resulting design evolved around the industry need for low sensor maintenance, high reliability, ease of installation, and high data quality to enable early detection of critical component changes. These improvements capitalized on advances in strain gage and accelerometer technology, micro-telemetry, radio-frequency power systems, and advanced adhesives for installation. The new system has been successfully applied in the field on large steam turbine-generators to detect grid-induced torsional vibration. The paper will describe background of turbine-generator torsional vibration as well as the technical features of this advanced telemetry application with examples of field data.
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Rapports d'organisations sur le sujet "Vibration continue"

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Hougen, J. T. Spectroscopic investigation of the vibrational quasi-continuum arising from internal rotation of a methyl group. Final report, 1990 - 1993. Office of Scientific and Technical Information (OSTI), décembre 1993. http://dx.doi.org/10.2172/466856.

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Hougen, Jon T. Annotated bibliography of research carried out from 1993 to 1999 under DoE Award No. DE-IA02-94ER14411 : Spectroscopic investigation of the vibrational quasi-continuum arising from internal rotation of a methyl group. Office of Scientific and Technical Information (OSTI), mars 2002. http://dx.doi.org/10.2172/807582.

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