Academic literature on the topic 'Vibrations non-linéaire de plaque'
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Journal articles on the topic "Vibrations non-linéaire de plaque"
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Nakai, Kumiko, Hideki Tanaka, Kyoko Fukuzawa, Jyunya Nakajima, Manami Ozaki, Nobue Kato, and Takayuki Kawato. "Effects of Electric-Toothbrush Vibrations on the Expression of Collagen and Non-Collagen Proteins through the Focal Adhesion Kinase Signaling Pathway in Gingival Fibroblasts." Biomolecules 12, no. 6 (June 1, 2022): 771. http://dx.doi.org/10.3390/biom12060771.
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Electric-toothbrush vibrations, which remove plaque, are transmitted to the gingival connective tissue via epithelial cells. Physical energy affects cell function; however, the effects of electric-toothbrush vibrations on gingival extracellular matrix (ECM) protein expression remain unknown. We aimed to examine the effects of these vibrations on the expression of ECM proteins—type I collagen (col I), type III collagen (col III), elastin, and fibronectin (FN)—using human gingival fibroblasts (HGnFs). HGnFs were seeded for 5 days in a six-well plate with a hydrophilic surface, exposed to electric-toothbrush vibrations, and cultured for 7 days. Subsequently, the mRNA and protein levels of col I, col III, elastin, and FN were examined. To investigate the role of focal adhesion kinase (FAK) signaling on ECM protein expression in vibration-stimulated cells, the cells were treated with siRNA against protein tyrosine kinase (PTK). Electric-toothbrush vibrations increased col I, col III, elastin, and FN expression; promoted collagen and non-collagen protein production; and enhanced FAK phosphorylation in HGnFs. Moreover, PTK2 siRNA completely blocked the effects of these vibrations on the expression of col I, col III and elastin mRNA. The results suggest that electric-toothbrush vibrations increase collagen, elastin, and FN production through the FAK-signaling pathway in fibroblasts.
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Thomas, Olivier, Liviu Nicu, and Cyril Touzé. "Flambage et vibrations non-linéaires d'une plaque stratifiée piézoélectrique. Application à un capteur de masse MEMS." Mécanique & Industries 10, no. 3-4 (May 2009): 311–16. http://dx.doi.org/10.1051/meca/2009057.
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MacRitchie, Neil, Gianluca Grassia, Jonathan Noonan, Paul Garside, Duncan Graham, and Pasquale Maffia. "Molecular imaging of atherosclerosis: spotlight on Raman spectroscopy and surface-enhanced Raman scattering." Heart 104, no. 6 (October 23, 2017): 460–67. http://dx.doi.org/10.1136/heartjnl-2017-311447.
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To accurately predict atherosclerotic plaque progression, a detailed phenotype of the lesion at the molecular level is required. Here, we assess the respective merits and limitations of molecular imaging tools. Clinical imaging includes contrast-enhanced ultrasound, an inexpensive and non-toxic technique but with poor sensitivity. CT benefits from high spatial resolution but poor sensitivity coupled with an increasing radiation burden that limits multiplexing. Despite high sensitivity, positron emission tomography and single-photon emission tomography have disadvantages when applied to multiplex molecular imaging due to poor spatial resolution, signal cross talk and increasing radiation dose. In contrast, MRI is non-toxic, displays good spatial resolution but poor sensitivity. Preclinical techniques include near-infrared fluorescence (NIRF), which provides good spatial resolution and sensitivity; however, multiplexing with NIRF is limited, due to photobleaching and spectral overlap. Fourier transform infrared spectroscopy and Raman spectroscopy are label-free techniques that detect molecules based on the vibrations of chemical bonds. Both techniques offer fast acquisition times with Raman showing superior spatial resolution. Raman signals are inherently weak; however, leading to the development of surface-enhanced Raman spectroscopy (SERS) that offers greatly increased sensitivity due to using metallic nanoparticles that can be functionalised with biomolecules targeted against plaque ligands while offering high multiplexing potential. This asset combined with high spatial resolution makes SERS an exciting prospect as a diagnostic tool. The ongoing refinements of SERS technologies such as deep tissue imaging and portable systems making SERS a realistic prospect for translation to the clinic.
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Cimetière, Alain, Aziz Hamdouni, and Olivier Millet. "Le modèle linéaire usuel de plaque déduit de l'élasticité non linéaire tridimensionnelle." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 326, no. 3 (March 1998): 159–62. http://dx.doi.org/10.1016/s1251-8069(99)89002-2.
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WATZKY, A. "VIBRATIONS LIBRES DES CORDES EN RÉGIME NON-LINÉAIRE : MODÈLE BIDIMENSIONNEL." Le Journal de Physique Colloques 51, no. C2 (February 1990): C2–857—C2–860. http://dx.doi.org/10.1051/jphyscol:19902199.
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Rahmani, Leila. "Conditions aux limites approchées pour une plaque mince non linéaire." Comptes Rendus Mathematique 343, no. 1 (July 2006): 57–62. http://dx.doi.org/10.1016/j.crma.2006.04.013.
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Millet, Olivier, Aziz Hamdouni, and Alain Cimetière. "Justification du modèle bidimensionnel non linéaire de plaque par développement asymptotique des équations d'équilibre." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 324, no. 6 (March 1997): 349–54. http://dx.doi.org/10.1016/s1251-8069(99)80045-1.
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Himpens, F. X., P. Aguettaz, C. Gautier, J. P. Pruvo, and X. Leclerc. "Quantification de la néovascularisation intra-plaque par échographie non linéaire avec injection d’un agent de contraste échographique : une nouvelle approche de la plaque vulnérable." Journal of Neuroradiology 39, no. 1 (March 2012): 41. http://dx.doi.org/10.1016/j.neurad.2012.01.123.
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Daya, El Mostafa, Lahcen Azrar, and Michel Potier-Ferry. "Modélisation par éléments finis des vibrations non-linéaires des plaques sandwich viscoélastiques." Mécanique & Industries 6, no. 1 (January 2005): 13–20. http://dx.doi.org/10.1051/meca:2005002.
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Azeem, Muhammad, Ambreen Afzal, Saqib Ali Jawa, Arfan Ul Haq, Mahwish Khan, and Husnain Akram. "Effectiveness of electric toothbrush as vibration method on orthodontic tooth movement: a split-mouth study." Dental Press Journal of Orthodontics 24, no. 2 (April 2019): 49–55. http://dx.doi.org/10.1590/2177-6709.24.2.049-055.oar.
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Abstract Objective: To investigate the effects of application of vibratory stimuli, using an electric toothbrush, on the rate of orthodontic tooth movement during maxillary canine retraction. Methods: A split-mouth study was conducted in 28 subjects (mean age = 20.8 years; ranging from 18 to 24 years) whose bilateral maxillary first premolars were extracted with subsequent canine retraction. On the Vibration side, light force (100 g) was applied to the canine for 90 days, in combination with vibratory stimuli provided by an electric toothbrush; only orthodontic force was applied to the canine on the non-vibration side. Amount of canine movement was measured monthly. Related to electronic toothbrush usage, a diary was provided to each patient for recording discomfort during experimental period, having 100-mm visual analogue scale (VAS). The paired t-test was used to assess the differences in amount of tooth movement between canines of the vibration and non-vibration sides. Results: The amount of tooth movement was similar for canines on the vibration side and on the non-vibration side (mean 0.81 ± 0.10 mm and 0.82 ± 0.11 mm, respectively, p> 0.05). Plaque accumulation was minimal in any subject throughout the study. No subject reported discomfort as a result of using the electric toothbrush. Conclusions: This study demonstrates that application of vibratory stimuli using an electric toothbrush, in combination with light orthodontic force, do not accelerate orthodontic tooth movement.
Dissertations / Theses on the topic "Vibrations non-linéaire de plaque"
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Pennetier, Olivier. "Interaction structures - détonations atténuation des efforts retransmis et étude de la réponse dynamique non linéaire de voiles minces." Orléans, 1998. http://www.theses.fr/1998ORLE2061.
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Ce travail, articule autour de trois axes principaux - étude théorique, numérique et expérimentale - concerne la réponse dynamique non linéaire de plaques circulaires métalliques minces face a une sollicitation agressive : la détonation. Ce mode d'explosion est déterministe et le champ de pression engendre, transitoire et de très forte intensité, est fonction de l'espace et du temps. Sous cet impact, la structure évolue rapidement vers les domaines particuliers de la non-livraison géométrique ou de la non-linearite matérielle (plasticité, viscoplasticité). La phase de modélisation numérique fait intervenir différentes formes d'équations du mouvement : théorie de von karman, équations de la membrane, théorie des coques et les lois de comportement anélastiques prises en compte sont celles du solide viscoplastique (loi de perzyna) ou plastique (modèle de Saint-Venant, algorithme de prager). Apres validations, différentes évolutions sont présentées : déformes, déformations ou vitesses de déformations. Les équations utilisées, adaptées à la géométrie du problème et modélisées par la méthode des différences finies, sont résolues de manière explicite, ce qui permet une grande rapidité des calculs. Une campagne expérimentale importante présente, outre la méthodologie et les divers montages expérimentaux, de nombreux exemples d'évolutions dynamiques de plaques minces sous une pression de détonation, qui sont, par la suite, confrontes aux simulations numériques. En tonique, il existe une loi de similitude (loi de hopkinson) qui permet de transposer des essais sur maquettes a des structures de grandes dimensions, ce qui place bien ce travail dans le contexte du milieu industriel. Cette étude, s'inscrivant au sein d'une démarche sécuritaire, permet donc la prise en compte des effets non linéaires et la prédiction du comportement de structures soumises à l'action d'une explosion.
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Humbert, Thomas. "Turbulence d'ondes dans les plaques minces en vibration : étude expérimentale et numérique de l'effet de l'amortissement." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066512/document.
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Turbulence d’ondes dans les plaques minces en vibration : étude expérimentale et numérique de l’effet de l’amortissement La théorie de turbulence d'ondes a pour but de décrire le comportement à long terme de systèmes faiblement non linéaires hors équilibre. Pour les plaques minces en vibration, ce formalisme permet de prédire un spectre de Kolmogorov-Zakharov (KZ) avec un flux d'énergie transféré des échelles d'injection à celles de dissipation le long d’une fenêtre de transparence. Les études expérimentales antérieures à cette thèse ont mis en lumière des différences notables entre les spectres mesurés et les specres théoriques. La présence, dans un solide, de l’amortissement à toutes les échelles, est ici étudié afin d’expliquer ce désaccord. En contrôlant expérimentalement l’amortissement, il a été montré que la dissipation déterminait la forme des spectres. Par la caractérisation de l’amortissement, il a été trouvé que ce dernier peut être décrit en fonction de la fréquence par une loi de puissance. La dissipation expérimentale a alors pu être introduite directement dans une simulation numérique des équations de Föppl-von Kàrmàn. Cette démarche conduit à passer de la solution théorique KZ obtenue en l’absence de dissipation à des spectres très proches des spectres expérimentaux. Ces observations ne remettent pas en cause l’emploi de la turbulence d’ondes pour décrire la vibration d’une plaque mince sollicitée par un forçage d’une grande amplitude mais encouragent à étendre les outils théoriques à notre disposition en l’absence d’une fenêtre de transparence. En réalisant cette généralisation de façon phénoménologique, une nouvelle solution stationnaire, différente de KZ et valable pour toute loi d’amortissement, a pu être calculée numériquementWave turbulence theory aims at describing the long time behavior of weakly non-linear, out-of-equilibrium systems. For thin vibrating plates, this framework allows predicting a Kolmogorov-Zakharov Spectrum (KZ) with an energy flux transfered from the injection to the dissipative scales along a transparency window. Previous experimental studies have pointed out some discrepancies between mesured and theoretical spectra. The fact that, in solid, damping acts at all scales, is here studied in order to explain this disagreement. By an experimental control of the dissipation, it is observed that dissipation determines the shape of spectra. Experimental measurement of the dissipation shows that damping can here be described, as a function of the frequency, by a power law. This behavior allows us to introduce directly damping in a numerical simulation of the Föppl-von Kàrmàn equations. It leads to pass from the theoretical solution KZ obtained without dissipation to spectra which are very closed to the experimental ones. These observations do not mean that wave turbulence theory should not be applied to thin plates excited by a strong forcing but encourage to extend our theoretical tools when there is no transparency window. By doing this in a phenomenological way, a new stationary solution, different from KZ and valid for any dissipation law, has been derived
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Couineaux, Audrey. "Modélisation vibro-acoustique du cristal Bashet : jouabilité et timbre du son produit par frottement." Electronic Thesis or Diss., Le Mans, 2024. https://cyberdoc-int.univ-lemans.fr/Theses/2024/2024LEMA1036.pdf.
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Le cristal Baschet est un instrument de musique conçu par les frères Baschet dans les années1950. Les sons émis par cet instrument résultent de vibrations induites par le frottement,causées par l’interaction entre les doigts humides du musicien et des tiges de verre. Chaquetige est reliée à un résonateur constitué d’un assemblage de poutres, dont les caractéristiquesdynamiques fixent la hauteur de la note. Les vibrations sont ensuite transmises à de grandes etfines plaques métalliques qui jouent le rôle d’éléments rayonnants. La fabrication et le réglage del’instrument s’appuient principalement sur un savoir-faire empirique. L’objectif de la thèse est deconstruire un modèle du fonctionnement acoustique de l’instrument, afin de mieux comprendrel’influence des paramètres de lutherie sur la jouabilité et le timbre singulier du son produit. Unmodèle, qualifié de minimal est développé pour rendre compte des auto-oscillations résultant dufrottement. Le résonateur est décrit par sa base modale, issue d’un modèle numérique, validépar une analyse modale expérimentale. L’interaction entre le doigt et le résonateur est régie parune loi de friction connue de la littérature. Celle-ci est par ailleurs mesurée au moyen d’uneméthode inverse appropriée, développée pour identifier les spécificités du contact frottant entrele doigt mouillé et la tige de verre. Pour ce système dynamique, les conditions d’apparition desauto-oscillations sont étudiées au moyen d’une analyse de stabilité linéaire et également de simulationstemporelles. Celles-ci permettent de discuter le rôle des paramètres de conception etde réglage du résonateur sur la facilité d’émission du son, c’est-à-dire la jouabilité de l’instrument.Le modèle minimal de l’instrument est enrichi de façon à prendre en compte des élémentsconnectés au résonateur tels que des tiges libres (moustaches) ou des plaques métalliques fines(diffuseurs). Ces éléments induisent un enrichissement spectral important, qui participe à l’identitésonore de l’instrument. Les moustaches donnent lieu à des vibrations par sympathie, dontles conditions d’apparition peuvent être modulées dans le temps, donnant lieu à des effets perceptifsinhabituels. Ce phénomène est mis en évidence expérimentalement et les paramètres lecontrôlant sont identifiés grâce des études paramétriques numériques. Les plaques fines en métalvibrent avec de grandes amplitudes, ce qui induit des non-linéarités géométriques conduisant àun enrichissement spectral similaire à celui existant dans les sons produits par les gongs. Ceteffet, étudié expérimentalement, s’exprime de façon relativement hétérogène sur l’ensemble dela tessiture de l’instrument.Le travail développé dans la thèse permet de comprendre et hiérarchiser les mécanismes physiquesimpliqués dans la production sonore de l’instrument, contribuant ainsi à la formalisationde règles de conception utiles à son évolutionThe Cristal Baschet is a musical instrument designed by the Baschet brothers in the 1950s. The sounds produced by this instrument result from vibrations induced by friction, caused by the interaction between the musician's wet fingers and glass rods. Each rod is connected to a resonator made of an assembly of beams, whose dynamic characteristics determine the pitch of the note. The vibrations are then transmitted to large, thin metal plates that act as radiating elements. The instrument's fabrication and tuning rely primarily on empirical know-how. The objective of the thesis is to build a model of the acoustic functioning of the instrument, to better understand the influence of design parameters on playability and the unique timbre of the sound produced.A minimal model is developed to account for the self-oscillations resulting from friction. The resonator is described by its modal basis, derived from a numerical model, validated by an experimental modal analysis. The interaction between the finger and the resonator is governed by a friction law known from the literature. This law is measured using an appropriate inverse method developed to identify the specifics of the frictional contact between the wet finger and the glass rod. For this dynamic system, the conditions for the appearance of self-oscillations are studied through linear stability analysis and also through time-domain simulations. These allow for a discussion of the role of design and tuning parameters of the resonator on the ease of sound emission, i.e., the playability of the instrument.The minimal model of the instrument is enriched to take into account elements connected to the resonator, such as free rods (whiskers) or thin metal plates (diffusers). These elements induce significant spectral enrichment, contributing to the sound identity of the instrument.The whiskers give rise to sympathetic vibrations, whose conditions of appearance can be modulated over time, leading to unusual perceptual effects. This phenomenon is experimentally demonstrated, and the controlling parameters are identified through numerical parametric studies.The thin metal plates vibrate with large amplitudes, which induces geometric nonlinearities leading to spectral enrichment similar to that found in the sounds produced by brass instruments. This effect, studied experimentally, is expressed relatively unevenly across the instrument’s range.The work developed in the thesis helps to understand and prioritize the physical mechanisms involved in the sound production of the instrument, thereby contributing to the formalization of design rules useful for its development
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Salem, Amgad Mohamed. "Amortissement visqueux et non linéaire au sein des assemblages structuraux métaliques et composites : essais en flexion sous vide." Toulouse 3, 2002. http://www.theses.fr/2002TOU30086.
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Xiang, Yan. "Un modèle de plaque en élasticité linéaire et non linéaire : convergence du développement asymptotique de la plaque élastique non linéaire." Paris 6, 1989. http://www.theses.fr/1989PA066519.
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On décrit, en général, par plaque encastrée un modèle de plaque qui a les cotes latéraux fixes. Or, dans la réalité, une plaque encastrée a toujours une partie voisine près de la cote qui est fixée aussi. D'ou l'idée de plaque réellement encastrée. Nous établissons tels modèles de plaque dans le cadre de l'élasticité linéaire et non linéaire en utilisant la méthode de développement asymptotique appliquée à la formulation variationnelle. Nous verrons alors que les difficultés résident au calcul de la troisième colonne du tenseur des contraintes de piola-kirchhoff. Apres avoir établi de tels modèles, nous examinons leurs approches à la plaque encastrée quand la mesure de la partie fixée autre que cotes latérales tend vers zéro. Nous obtenons alors la conclusion que la plaque encastrée est une limite de la plaque réellement encastrée. Nous traitons dans la deuxième partie la convergence de développement asymptotique d'une plaque encastrée en théorie de l'élasticité non linéaire. Avec l'hypothèse le vecteur de déplacements et le tenseur des contraintes de piola-kirchhoff sont bornes dans leurs espaces, nous démontrons qu'il existe une sous suite du vecteur de déplacement et du tenseur des contraintes qui converge faiblement vers l'une des solutions du problème limite. Ce résultat est généralise par la suite a la plaque encastrée avec une loi de comportement générale. Nous remarquons que la convergence d'une sous suite est justifiée par la non-unicite des solutions du problème limite
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Pantz, Olivier. "Quelques problèmes de modélisation en élasticité non linéaire." Paris 6, 2001. http://www.theses.fr/2001PA066190.
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Faiz, Adil. "Amortissement vibratoire et anéchoïsme par traitement non-linéaire d'éléments piézoélectriques." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0027/these.pdf.
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Les thématiques du LGEF englobent le développement des matériaux adaptatifs et de systèmes électroactifs. Les amortisseurs semi-passifs piézoélectriques constituent à ce titre l'une des déclinaisons les plus récentes de ces travaux. Dans ce cadre, une technique originale appelée SSD (Synchronized Switch Damping) a été développée en s'articulant sur un traitement non linéaire de la tension générée par les éléments piézoélectriques. Cette technique d'une grande universalité permet d'augmenter significativement les performances de systèmes d'amortissement de structures, de concevoir des éléments de récupération d'énergie ou encore d'effectuer de l'anéchoïsme. Mes travaux de thèse ont consisté à adapter la technique SSD au contrôle de l'onde acoustique réfléchie et de l'onde transmise par une paroi dans un conduit circulaire. L'objectif est de parvenir à un contrôle vibroacoustique du système permettant une diminution des champs de pression transmise et réfléchie. Dans ce but, un modèle analytique intégrant les phénomènes vibratoires et acoustiques a permis d'estimer l'atténuation obtenue en réflexion et en transmission. Ces estimations ont été validées à l'aide d'un dispositif expérimental constitué d'un conduit équipé d'une terminaison SSD permettant des atténuations de l'ordre de 15dB en réflexion etd e 7dB en transmission pour une excitation de type Burst. Le comportement fréquentiel de l'amortisseur SSD a également été estimé grâce à une excitation au balayage (Sweep). Des atténuations de l'ordre de 16dB en transmission sur 1 bande de 600Hz montrent aussi le caractère large bande de l'amortisseur. Finalement une approche probabiliste est appliquée pour résoudre le problème d'une excitation réaliste "large bande" simulée expérimentalement par un bruit blanc. Des atténuations significatives montrent l'intérêt qui peut apporter la loi probabiliste pour ce type d'excitation. De plus, les performances d'un panneau acoustique à absorbeurs SSD multiples ont été évaluées par simulation à l'aide d'un Modèle à Eléments Finis (code ANSYS), établissant ainsi la faisabilité de systèmes absorbants à large bande fréquentielleSeveral semi passive techniques were previously developed at the LGEF laboratory to address the problem of structural vibration damping and noise reduction. These techniques, called SSD for “Synchronized Switch Damping”, consist in a non-linear processing of the voltage on a piezoelectric element. It is implemented with a simple switch driven during short periods synchronously with the structure motion. The switch connects the piezoelectric element to a circuit, which can be either a simple short circuit (SSDS), a small inductor (SSDI) or voltage sources (SSDV). In the case of the SSDS technique the voltage is briefly forced to zero, in the case of the SSDI it is reserved and in the case of the SSDV it is reversed around a continuous voltage. The experimental set-up consists of tube split in 2 regions by a piezoelectric element (BUZZER). A loudspeaker generates a tone acoustic wave in the first volume. Two microphone measures the reflected and transmitted acoustic wave in the two areas. The piezoelectric element is modelled by a simple lumped model. This model was theoretically developed allowing the simulation of the buzzer in Matlab and Ansys environment. Due to this mechanism, a good attenuation is obtained in reflection (30dB) and transmission (15dB) wave with an impulsionnelle excitation and around (16dB) attenuation is observed over a 600Hz wide frequency band in transmission using a sweep excitation
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Monteil, Mélodie. "Comportement vibratoire du steelpan : effet des procédés de fabrication et dynamique non linéaire." Phd thesis, Palaiseau, École nationale supérieure de techniques avancées, 2013. http://pastel.archives-ouvertes.fr/pastel-00913650.
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Cette étude porte sur le steeldrum, aussi appelé steelpan, percussion mélodique de Trinidad et Tobago, fabriquée à partir de bidons métalliques dont une des faces subit un ensemble de déformations irréversibles afin d'obtenir une cuve principale à l'intérieur de laquelle sont façonnées les différentes notes de l'instrument. Cette thèse s'organise autour de deux axes. D'une part les processus de fabrication sont étudiés afin de mieux comprendre le travail du facteur et de proposer une modélisation de la première étape de fabrication. D'autre part, des études vibratoires sont menées sur l'instrument fini, pour comprendre la dynamique complexe responsable de son timbre. La première partie rend compte de l'évolution des caractéristiques vibratoires au cours de la fabrication. On remarque une forte localisation vibratoire au moment de la création des notes, des évolutions marquées des amortissements et des fréquences propres lors du chauffage, et des relations harmoniques après l'accordage final. La seconde partie se concentre sur la première étape de fabrication au cours de laquelle le haut du bidon est martelé pour obtenir une calotte sphérique concave. Ce processus de plasticité est modélisé analytiquement sous les hypothèses de von Karman par une structure mince soumise à des contraintes initiales. L'influence du changement géométrique et celle de l'état de contraintes résiduelles sont alors quantifiées sur les paramètres dynamiques de la structure dans son nouvel état d'équilibre. Enfin la dernière partie s'intéresse aux vibrations de l'instrument terminé qui présente un comportement dynamique caractéristique des systèmes non linéaires géométriques. En mode de jeu usuel, des échanges d'énergie entre les modes sont clairement audibles. Cette richesse de timbre provient des résonances internes dues à l'accordage, si bien que des couplages complexes sont mesurés pour des amplitudes vibratoires très faibles. Des modèles originaux de résonances internes sont proposés.
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Meurdefroid, Anthony. "Dynamique des structures assemblées - Amortissement non linéaire." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST029.
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Cette thèse s'inscrit dans des travaux liés aux problématiques des structures assemblées. Après une analyse et une synthèse des différentes échelles de modélisation mises en jeu afin de déterminer l'amortissement dans les liaisons, le manuscrit met en évidence les changements d'échelles, soient les réductions de modèle. La résolution des problèmes de vibration non-linéaire mettent en jeu de nombreuses méthodes numériques. Le cadre de la thèse étant le régime permanent, l'équilibrage harmonique est la méthode clé, couplée à une résolution originale de type point fixe. En fonction du cas d'étude, trois pistes de résolution sont proposées. Si on connait tout du comportement, l'étude de la structure complète se résume à la résolution d'un système différentiel. La question est "comment le résoudre de manière efficace ?" Une comparaison de quatre formulations différentes du même problème dans les domaines temporel et fréquentiel, avec ou sans régularisation des forces hystérétiques, permet d'apporter des réponses à cette question. Si cela n'est pas possible ou déraisonnable, il faut alors essayer de décomposer le problème. Une des solutions afin d'accélérer le processus est de réduire le modèle. Pour cela une nouvelle base de réduction de la partie non-linéaire est introduite. Sa construction prend appui sur un indicateur énergétique et son utilisation sur un abaque. Enfin, si la construction de cet abaque est impossible, il est alors nécessaire d'avoir un calcul complet avec générations séquentielles d'abaques dynamiques de la sous-structure. Cette méthodologie adaptative alterne les résolutions temporelle et fréquentielle respectivement sur les domaines non-linéaire et linéaire sans recours à une méthode incrémentale type AFTThis thesis is part of work related to the problems of assembled structures. After an analysis and a synthesis of the different modeling scales involved in order to determine the damping in the joints, the manuscript highlights the scales changes, i.e. model reductions. Many numerical methods are used to solve nonlinear vibration problems. The framework of the thesis being steady-state vibrations, the Harmonic Balance Method is commonplace. Here it is coupled with an original fixed point algorithm. Depending on the case study, three resolution paths are proposed. If we know everything about the behavior, the study of the complete structure can be summarized to the resolution of a differential system. The question is "how to solve it efficiently?" A comparison of four different formulations of the same problem in the time and frequency domains, with or without the regularization of hysterical forces, provides answers to this question. If this is not possible or unreasonable, then one must try to decompose the problem. One way to speed up the process is to reduce the model. For this purpose a new basis for reducing the non-linear part is introduced. Its construction is based on an energy indicator and its use is based on a chart. Finally, if the construction of this chart is impossible, it is then necessary to have a complete computation with sequential generations of dynamic charts of the sub-structure. This adaptive methodology alternates the time and frequency resolutions respectively on non-linear and linear domains in a non incremental way
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Watzky, Alexandre. "Sur la vibration non linéaire des fils précontraints (cordes, verges tendues)." Paris 6, 1992. http://www.theses.fr/1992PA066369.
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L'étude des vibrations des verges (ou des cordes) tendues est particulièrement riche par la multitude de phénomènes mis en jeu (non-linéarités, couplages de modes, amortissements. . . ). Partant d'une revue historique rappelant les diverses contributions depuis le traité de Rayleigh et permettant de préciser les phénomènes expliqués ainsi que les limites des modèles existants, on établit un modèle dynamique de verge plus général. Ce modèle non linéaire est construit à partir des équations locales de la mécanique des milieux continus, dans le cadre général des rotations et déplacements finis, son degré de finesse étant dicté par l'hypothèse des petites déformations. Cette approche, ici limitée au cas linéairement élastique, permet de placer l'étude dans un cadre mécanique à la fois précis et ouvert à d'autres relations de comportement (telles que thermoviscoélastique). L’utilisation d'une construction géométrique originale de la déformée de la ligne moyenne met immédiatement en évidence la torsion qui joue le rôle d'un paramètre. Ce phénomène, jusqu'ici éludé, peut alors être aisément pris en compte. Les conditions d'immobilité aux extrémités permettent de définir les modes spatiaux et d'aboutir, par projection sur ceux-ci des équations du mouvement, aux équations modales vérifiées par les parties temporelles de la solution. Ces équations, établies pour la première fois dans le cas le plus général, font clairement apparaître les divers couplages de modes et fournissent un outil apte à décrire la nature des mécanismes de couplage, certains étant soumis à des règles de sélection précises. Une étude de la génération de modes axiaux par les vibrations transversales permet d'expliquer les phénomènes constatés expérimentalement et met notamment en évidence la nécessaire combinaison de deux modes particuliers. On peut alors discuter la pertinence de la classique hypothèse d'allongement uniforme
Book chapters on the topic "Vibrations non-linéaire de plaque"
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Smirnov, Andrei L., and Grigory P. Vasiliev. "Vibration Control of a Non-homogeneous Circular Thin Plate." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 267–76. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_20.
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Tonetti, Agata, and Massimo Rossetti. "Wood Snoezelen. Multisensory Wooden Environments for the Care and Rehabilitation of People with Severe and Very Severe Cognitive Disabilities." In The Urban Book Series, 1003–15. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-29515-7_89.
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AbstractThe paper wants to present the progress of a research project focused on the study and design of a Snoezelen room made with wooden components. “Snoezelen” refers to closed environments capable of stimulating the senses in people with severe intellectual disabilities and non-self-sufficient people. Within these environments, multisensory stimulation takes place through various equipment and instruments such as optical fibers, water-powered light columns, systems for the reproduction of sounds or vibrations, and materials with different surface treatments. Many studies and researches have demonstrated the effectiveness of multisensory stimulation generated within a Snoezelen environment on children with autism spectrum disorder, and how this has led to beneficial effects such as the reduction in aggressive and/or self-injurious behaviors. The increase and diffusion of these environments, especially in schools, could lead to both an increase in the number of students who can undertake a rehabilitation process, and an increase in the sensory-perceptive aids available to the school. The rehabilitation and multisensory aspect of the Snoezelen methodology is, in this context, emphasized by the use of wood, thanks to its beneficial properties in terms of healthiness, comfort, and influences on psychological aspects. The goal of the research is the design of a wooden Snoezelen environment, the drafting of guidelines for its implementation, and an evaluation schedule for its use. In particular, the environment will be made by applying construction techniques in wood as a material for cladding, finishing, and components of the interior environment.
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Cao, Fulai, Xiaomei You, Long Cui, and Zhaoming Liu. "Research on Automatic Liquid Level Measurement System for Nonferrous Metal Ingot Line." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220499.
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Non-ferrous metals play an important role in the national economy, and more and more attention has been paid to their efficient large-scale production. However, the non-ferrous metal production plant environment is bad, the ingot line vibration is violent, the surface of the metal solution also has strong reflective, these adverse factors lead to the automatic detection of the level measurement process in the non-ferrous metal production is very difficult, have to retain a large number of manual links. In order to solve the above problems, an automatic measurement system of non-ferrous metal solution level based on structured light triangulation is established. The system adopts filtering algorithm based on statistics to suppress the adverse effect of ingot line vibration on measurement. At the same time, by increasing the Angle between the optical axis of the camera and the laser plane, the influence of the strong reflection of the solution surface on the measurement can be reduced. The relative error of the system can be controlled within 1.3%, which can meet the actual measurement demand in engineering.
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Mukhopadhyay, Premangshu. "Analysis of Performance Characteristics by Firefly Algorithm-Based Electro Discharge Machining of SS 316." In Machine Learning Applications in Non-Conventional Machining Processes, 45–54. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3624-7.ch004.
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The process of combining two or more non-conventional machining processes to obtain the required machining performance is known as hybridisation. Hybrid electro discharge machining came into the picture of macro machining due to the requirement of more rapid machining process with improved efficiency of non-conventional machining process. The technique of vibration assisted EDM process did not prove to be successful due to some disadvantages like increase in tool wear for low melting and comparatively softer tool material. Therefore, a need for more advanced hybridised process has been realized to improve the overall machining efficiency specially circularity and radial overcut. A permanent magnetic field force assisted EDM process was carried out on SS 316 plate with tungsten carbide tool of 5 mm diameter. MRR, TWR, and diametral overcut have been optimized by firefly algorithm technique which showed satisfactory results. It has been found that tool wear and diametral overcut has been found to be reduced with magnetic field-assisted EDM than conventional EDM processes.
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Lohar, Hareram, Anirban Mitra, and Sarmila Sahoo. "Effect of Boundary Conditions and Taper Patterns on Geometrically Nonlinear Frequency Response of Axially Graded Beams on Elastic Foundation." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 110–40. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch006.
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Forced vibration analysis is performed on a tapered axially functionally graded beam resting on elastic foundation under externally applied harmonic excitations to present the effect of boundary conditions and taper patterns on the frequency response. The elastic foundation is modelled in the present analysis as Winkler foundation. A displacement based semi-analytical method is adopted for mathematical formulation and the derivation of governing equations is carried out following Hamilton's principle. Von Karman nonlinear strain-displacement relation employed to incorporate geometric nonlinearity. Broyden method is adopted to solve the nonlinear set of equations. Frequency response curves are plotted in non-dimensional frequency-amplitude plane to represent nonlinear forced vibration characteristic of the system. New benchmark results are also provided for different combination of system parameters (i.e., excitation amplitudes, foundation stiffness values, material models, taper patterns, and flexural boundary conditions). Operational deflection shapes (ODS) are also presented.
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Bose, Tanmoy, N. S. V. N. Hanuman, and Subhankar Roy. "Non-Destructive Testing of Carbon Fibre Reinforced Polymer (CFRP) Composite Using Thermosonic Technique." In Handbook of Research on Developments and Trends in Industrial and Materials Engineering, 348–65. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1831-1.ch015.
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Composite materials are often subjected to low velocity impacts which leads to delamination in subsequent layers. Linear ultrasound-based approaches are not accurate enough to detect it properly. The local defect resonance (LDR) based thermosonic is proved to be an efficient candidate for detection of such defects. LDR frequency excitation leads to high amplitude vibration which raises defect temperature drastically, detectable by an infrared camera. In this chapter, a numerical investigation of LDR frequency excited ultrasound thermography is carried out on delaminated carbon fibre reinforced polymer (CFRP) plate. The location and size of the delamination can be easily understood from thermal signature. The temperature gradient variation is found to be high at first and then it decreases due to higher heat conduction rate. The delamination in CFRP plate is detected by standard phased array ultrasound testing (PAUT) using flat bottom hole in aluminium plate as a case study. Delamination detection by PAUT is found to be very time consuming process compared with thermosonic technique.
Conference papers on the topic "Vibrations non-linéaire de plaque"
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Brown, Avery, Ben Beck, Micah Shepherd, Edward Smith, Bhavya Patel, Noah Robertson, Charles Bakis, and Nicholas Vlajic. "Circular Acoustic Black Holes Integrated into Carbon/Epoxy Stiffened Panels for Noise Control." In Vertical Flight Society 80th Annual Forum & Technology Display, 1–16. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0080-2024-1245.
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Carbon fiber reinforced epoxy composite stiffened panels are increasingly being used for structural components in large transport rotorcraft. However, problems are arising with high levels of vibration and interior noise due to the increased stiffness-to-density ratio of composites. The current investigation explores the potential of reducing vibrations in carbon/epoxy stiffened panels with the integration of acoustic black holes (ABH), namely features that incorporate a power law thickness taper. The proposed approach involves designing a taper into the thickness of the blade stiffeners as well as the thin plate. Integration of ABHs into the fuselage structure has the potential to reduce broadband vibrations. Multiple parametric studies with either an ABH integrated into the blade stiffener or a grid of ABHs integrated into the plate were conducted, and the tradeoffs between vibration amplitudes, panel mass, and compressive buckling load were examined. Carbon/epoxy panels were fabricated using vacuum-bag-oven processing with out-of-autoclave prepreg and verified to be of good quality. The integrated velocity response, a proxy for the radiated noise from a panel, and compressive buckling were simulated using finite elements. Comparisons were made to experimentally measured data from modal testing and compression buckling testing. Experimental results indicated that when an ABH is integrated into the blade stiffener and 15 ABHs are integrated into the plate in a grid configuration, the panel mass was unchanged, the integrated velocity response decreased by 2.82 dB, and the buckling load increased by 2.9% compared to a baseline non-tapered design.
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Kotek, Lubos, Michal Holub, Jan Vetiska, Zdenek Hadas, and Petr Blecha. "Non-Invasive Displacement Measurement of Lightweight Structures Under Dynamic Excitations." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37559.
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The present article deals with the processing of data obtained by non-invasive measurement methods of instantaneous displacement of lightweight structures. This data is necessary to evaluate tuning-up of characteristics of an electro-magnetic vibration energy harvester, which is used for energy harvesting from these ambient mechanical vibrations. The electro-magnetic vibration energy harvester is device for powering of low power consumption wireless sensors without any external source of energy. The primary source of energy is only mechanical vibrations in place of wireless sensor and the operation without primary batteries is required. These techniques of wireless measurement are commonly used in aeronautics applications. The knowledge of mechanical vibrations in place of wireless sensors with vibration energy harvester is used for development of vibration energy harvester design. The major idea is to verify the use of non-invasive measurement using high-speed cameras with measurement obtained from the laser interferometer. The measurement using high-speed camera can provide very important information about resonance operation of the vibration energy harvester during the future development.
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Batista, F. B., A. T. Fabro, L. F. Cóser, J. R. F. Arruda, E. L. Albuquerque, and E. P. Tomasini. "IN-PLANE MODAL TESTING OF A FREE ISOTROPIC PLATE USING LASER DOPPLER VIBROMETER MEASUREMENTS." In 9TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NON-CONTACT TECHNIQUES AND SHORT COURSE. AIP, 2010. http://dx.doi.org/10.1063/1.3455475.
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Ashour, Osama N., and Ali H. Nayfeh. "Nonlinear Adaptive Vibration Absorber for the Control of Plate Vibrations." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21470.
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Abstract A nonlinear adaptive vibration absorber to control the vibrations of flexible structures is investigated. The absorber is based on the saturation phenomenon associated with dynamical systems possessing quadratic nonlinearities and a two-to-one internal resonance. The technique is implemented by coupling a second-order controller with the structure’s response through a sensor and an actuator. Energy is exchanged between the structure and the controller and, near resonance, the structure’s response saturates to a small value. Experimental results are presented for the control of a rectangular plate and a cantilever beam using piezoelectric ceramics and magnetostrictive alloys as actuators. The control technique is implemented using a digital signal processing board and a modeling software. The control strategy is made adaptive by incorporating an efficient frequency-measurement technique. This is validated by successfully testing the control strategy for a non-conventional problem, where nonlinear effects hinder the application of the nonadaptive controller.
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Okada, Kenji, Ken-ichi Nagai, Shinichi Maruyama, and Takao Yamaguchi. "Effects of a Concentrated Mass on Chaotic Vibrations of a Clamped Circular Plate With Initial Deformation." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48271.
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Experimental results are presented on effects of a concentrated mass on chaotic vibrations of a clamped circular plate. The plate has initial deformation due to initial deflection and initial in-plane compressive constraint at the boundary. The concentrated mass is attached on the center of the plate. Under periodic excitation, non-periodic responses with dynamic snap-through are generated on the plates. The responses are inspected by the Fourier spectrum, the Poincare´ projection, the maximum Lyapunov exponents and the principal component analysis. The non-periodic responses are found to be chaotic responses. The lowest mode of vibration shows the largest contribution ratio. When the concentrated mass is attached on the plate, the region of the response is shifted to the lower frequency. Furthermore, the width of the frequency region is decreased. The contribution ratio of the lowest mode slightly increases.
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Dreier, Florian, Thorsten Pfister, and Jürgen Czarske. "Monitoring of Blade Vibrations and Tip Clearance at Non-Metallic Rotors in Turbo Machines." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69540.
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In order to improve the safety, the lifetime and the energy efficiency of turbo machines, the dynamic behaviour of the rotor has to be analysed and optimized. Thus, rotor unbalances, dynamic deformations and blade vibrations as well as blade tip clearance changes have to be monitored during operation to optimize the rotor design and to validate numerical models. However, these are great challenges for metrology, since small, robust and non-contact measurement techniques are required offering both micrometer accuracy and microsecond temporal resolution which is not fulfilled with currently available measurement techniques. To solve this problem, we present in this contribution a miniaturized fiberoptic laser Doppler probe that measures simultaneously the in-plane velocity and the out-of-plane position of laterally moving objects. Experiments have been carried out demonstrating the capability of this sensor to measure engine order blade vibrations instantaneously. Assuming a single engine order and a known vibration frequency, only one laser Doppler probe is necessary to measure the vibration amplitude. Thus, in contrast to blade tip timing, only one optical access to the blade tip is sufficient to measure the vibration amplitude. Furthermore, the novel sensor performs even at composite materials such as strongly absorbing carbon-fiber-reinforced plastic (CFRP) which became more popular in rotors of turbo machines.
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Rothberg, Steven J., and Neil A. Halliwell. "Application of Laser Vibrometry to Vibration Measurement on Rotating Components." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0720.
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Abstract This paper describes the application of Laser Doppler Vibrometry to vibration measurements on rotating targets. The noise generating mechanism of the laser speckle phenomenon is first explained before confirmation of the insensitivity of measurements to target shape. The principal focus of the paper is on the fundamental limitation associated with the use of Laser Vibrometers for radial vibration measurements directly on rotating components. In such measurements significant cross-sensitivities to speed fluctuations, including torsional vibrations, and in-plane vibrations are evident, preventing synchronous vibration analysis. Mathematical and electronic means to resolve the correct orthogonal vibration components are presented and shown to be successful in enabling the use of Laser Vibrometry for non-synchronous vibration measurements.
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Ramachandran, Maya, Shashank Bezgam, Lonny L. Thompson, John C. Ziegert, Timothy B. Rhyne, and Steven M. Cron. "On the Effects of Edge Scalloping for Collapsible Spokes in a Non-Pneumatic Wheel During High Speed Rolling." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11342.
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The acoustic signature produced by non-pneumatic wheels with collapsible spokes is a critical design criterion for automotive and other mobility applications. During high speed rolling, acoustic noise may be produced by the interaction of vibrating spokes with a shear deformable ring as they enter the contact region, buckle and then snap back into a state of tension. In order to identify and help understand the causes of acoustic noise for a rolling non-pneumatic wheel, a two-dimensional finite element model with geometric nonlinearity has been utilized. The model consists of a shear ring modeled as two relatively inextensible membranes with high circumferential modulus separated by a hyper-elastic material. The temporal variation in spoke length as the spoke passes through the contact zone is extracted and used as input to a three-dimensional (3-D) model of a single spoke. The 3-D spoke model is able to capture out-of-plane vibration modes of the spoke which may contribute as a source of acoustic excitation and allows for modeling of edge scalloping. Natural frequencies and mode shapes of the various spoke design strategies are computed and correlated with the frequency response of the out-of-plane spoke vibrations. Results indicate that scalloping the edges of the spoke can dramatically reduce the amplitude of vibration, but does not have a strong effect on location of frequency peaks in a FFT of the time-signal. An optimal amount of scalloping was determined which reduces maximum vibration amplitude to an asymptotic value.
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Emamgholizadeh, Mohammad Javad, Ahmad Reza Mostafa Gharabaghi, Karim Abedi, and Mohammad Hossein Sedaaghi. "An Experimental Study on the Effect of Splitter Plate Angle on the VIV Behavior of Submarine Pipeline on an Erodible Bed Under Clear Water Condition." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10636.
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Pipeline is an appropriate method for transmission of oil and gas from seabed hydrocarbon reservoir to the land and platform or any other place where it is needed. Free spans in the line may occur initially by an uneven seabed or be created later due to under-scouring. Vortex Induced Vibration (VIV) may occur in these free spans at high Reynolds’ numbers. Resonance can occur if the frequency of vortex shedding is close to the pipeline’s natural frequency. Otherwise, it can cause pipeline’s fatigue leading to its breakage and consequently economical and environmental losses. In literature, different methods are presented for decreasing the scouring depth due to the vortex shedding. One of them is the application of splitter plate. In this paper, the effect of splitter plate’s angle with horizon (α) on the vibrating behavior of pipeline with two degrees of freedom over an erodible bed is studied experimentally. The experiments were performed for reduced velocity in the range of 2.45–5.06 and gap ratio of zero. Image processing technique as a non-contact method is used for measuring the vibrations of cylinder. Experimental results indicate that the splitter plate’s angle is an important factor on the cylinder’s vibration amplitude. According to these results, for the angle in the range of 0 ≤ α ≤ 30, the vibration amplitude is decreased while its frequency is increased, but the results are vice versa for the range of 60 ≤ α ≤ 90.
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Ouyang, Huajiang, J. E. Mottershead, M. P. Cartmell, and M. I. Friswell. "In-Plane Stick-Slip Vibration on the Surface of a Flexible Disc Clamped Between Elastic Sliders." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-3906.
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Abstract The in-plane stick-slip vibration of two slider systems which are driven together around the surfaces of either side of a flexible vibrating disc, and the induced transverse vibration of the disc, are investigated. The disc is taken to be an elastic annular plate and each slider has flexibility in the circumferential (in-plane) and transverse directions. The static friction coefficient is assumed to be higher than the kinetic friction coefficient. Because of the friction force acting between the disc and the slider systems, the sliders will oscillate in the stick-slip mode in the plane of the disc. The transverse vibration induced by the oscillating sliders will change the normal forces of the slider systems acting on the disc, which in turn will change the in-plane oscillation of the sliders. Therefore, the in-plane oscillation of the sliders and the transverse vibration of the disc are coupled. For different values of system parameters, the coupled in-plane oscillation of the sliders and transverse vibration of the disc will exhibit quasi-periodic as well as chaotic behaviour. Typical patterns of chaotic vibration of the slider systems and of the disc are presented in graphs to illustrate the special behaviour of this non-smooth, nonlinear dynamical system. The physical model represents a car disc brakes.