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Thèses sur le sujet « VIBRATING STRING »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 7 février 2022

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1

Kotinda, Giovanni Iamin. "Absorvedor dinâmico de vibração tipo lâmina vibrante." Universidade Federal de Uberlândia, 2005. https://repositorio.ufu.br/handle/123456789/14912.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>This work is dedicated to the design of a vibrating blade dynamic vibration absorber (ADVLV), which is composed by a blade that is subjected to an initial traction T , and contains a concentrated mass m that is fixed at a given position d along the blade. These three parameters can be adjusted so that the ADVLV is tuned. For this aim, a finite element model of the system was built, leading to a design methodology for the absorber. Also, design of experiment techniques were performed to obtain the most interesting configurations f
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Leban, Simon Peter. "Interdisciplinarity in science education in France: analysis of approaches and their application to the vibrating string case study." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21180/.

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This thesis explores the relations among STEM-disciplines in France, with a special focus on the interaction between mathematics and physics. It presents the French high school system that recently underwent a governmental reform called BAC 2021. The work examines different approaches to interdisciplinarity in a context of science education, illustrating in particular the Julie Thompson Klein’s taxonomy. Six French researchers working with interdisciplinary were interviewed. The analysis with the Klein’s theoretical lenses of the definitions of interdisciplinarity collected in the interviews
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Shou, Xingxian. "The Suppression of Selected Acoustic Noise Frequencies in MRI." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1281404517.

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MATTOS, PAULO ALBERTO DA COSTA. "DRILL STRING VIBRATIONS IN SOLIMÕES BASIN OPERATIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25692@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Os custos de uma campanha exploratória, incluindo a perfuração de poços de petróleo estão cada vez mais elevados. As vibrações nas colunas de perfuração estão presentes a todo momento nas operações de perfuração, o que podem ocasionar a quebra destas colunas e do BHA (Bottom Hole Assembly), danos em brocas e demais equipamentos. Além do custo do possível dano e/ou perda destes equipamentos, existem os custos da sonda parada e a despesas operacionais das companhias contratadas, o chamado custo de Stand by, e o mais indesejável, a perda do po
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Persson, Tobias, and Andreas Fredlund. "Motor control under strong vibrations." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355208.

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Shyu, Rong-Juin. "Bending vibration of rotating drill strings." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14205.

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Góis, Aédson Nascimento. "Elementos da análise funcional para o estudo da equação da corda vibrante." Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/6511.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work, we are treated some elements of functional analysis such as Banach spaces, inner product spaces and Hilbert spaces, also studied Fourier series and at the end briefly consider the equation of the vibrating string. With this, you realize that you do not need a lot of theory in order to get significant results.<br>Neste trabalho, são tratados alguns elementos da análise funcional como espaços de Banach, espaços com produto interno e espaços de Hilbert, estudamos também séries de Fourier e no final considera
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PEREIRA, LEONARDO DIAS. "MINIMIZING DRILL STRING TORSIONAL VIBRATION USING SURFACE ACTIVE CONTROL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=30271@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Parte do processo de exploração e desenvolvimento de um campo de petróleo consiste nas operações de perfuração de poços de petróleo e gás. Particularmente para poços de águas profundas e ultra-profundas, a operação requer o controle de uma estrutura muito flexível que é sujeita a condições de contorno complexas, tais como as interações não-lineares entre broca e formação rochosa ou entre a broca e a parede de poço. Quanto a esta complexidade
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9

Khan, Khaja Zameeruddin. "Longitudinal and torsional vibration of drill strings." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15092.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1986.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Bibliography: leaf 44.<br>by Khaja Zameeruddin Khan.<br>M.S.
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Harris, Nigel. "On the role of longitudinal string vibrations in the generation of violin sound." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273858.

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11

Taylor, Tanasha A. "A concept virtual harp with physical string vibrations using augmented reality for therapy." [Ames, Iowa : Iowa State University], 2008.

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12

Dahlbom, David A. "A framework for exploring the relationship between nonlinear string vibration and frequency modulation." Thesis, Boston University, 2013. https://hdl.handle.net/2144/21142.

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Thesis (M.Sc.Eng.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>The spectra of low piano tones have long been known to display unusual, inharmonic characteristics. Surprisingly, precisely this property allowed for fairly successful generation of artificial piano tones by the frequency modu
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Saad, A. M. "Nonlinear free vibration analysis of strings by the Galerkin method /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487777170404091.

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Hasanyan, Jalil Davresh. "Modeling and Analysis of a Moving Conductive String in a Magnetic Field." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/87530.

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A wide range of physical systems are modeled as axially moving strings; such examples are belts, tapes, wires and fibers with applied electromagnetic fields. In this study, we propose a model that describes the motion of a current-carrying conductive string in a lateral magnetic field, while it is being pulled axially. This model is a generalization of past studies that have neglected one or more properties featured in our system. It is assumed that the string is moving with a constant velocity between two rings that are a finite distance apart. Directions of the magnetic field and the motion
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Wang, Ming. "Embedded strain sensor with power scavenging from bridge vibration." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1419.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Dept. of Civil Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Issanchou, Clara. "Vibrations non linéaires de cordes avec contact unilatéral. Application aux instruments de musique." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066122/document.

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Les contacts entre une corde vibrante et un obstacle unilatéral interviennent dans de nombreux instruments de musique tels que la tampoura, le sitar ou encore la basse électrique. Ils introduisent une forte non-linéarité dans le mouvement de la corde, qui se traduit notamment par d'importants transferts d'énergie. Dans ce manuscrit, une étude à la fois numérique et expérimentale du contact corde/obstacle est proposée. Trois types de schémas conservatifs sont développés. Ils s'appuient sur une description modale de la corde, ce qui permet un ajustement des fréquences propres et amortissements p
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ANDRADE, BRUNO CESAR CAYRES. "NONLINEAR DYNAMIC ANALYSIS OF DRY FRICTION-INDUCED TORSIONAL VIBRATION IN A DRILL-STRING EXPERIMENTAL SET-UP." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35486@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Os últimos leilões do pré-sal para exploração e produção de petróleo e gás no Brasil indicam que as operações de perfuração se tornarão mais intensas nos próximos anos. O processo de perfuração rotativo é amplamente utilizado para alcançar os reservatórios de petróleo e devido à relação diâmetro/comprimento do sistema de perfuração, o modo de vibração torcional está presente em quase todos os processos de perfuração, podendo chegar a um estad
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Byun, Chansup. "Free vibration and nonlinear transient analysis of imperfect laminated structures." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-135342/.

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Anakok, Isil. "A Study on Steady State Traveling Waves in Strings and Rods." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83890.

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The main focus of this present work is to study how mechanical steady state traveling waves can be generated and propagated through one dimensional media by applying forces. By steady state traveling waves we refer to propagating mechanical waves in a finite medium that never exhibit reflections at the boundaries and continuously move from one end of the structure to the other. Mechanical waves can be classified as traveling, standing and hybrid waves that are the results of the interplay of excitation forces, applied force locations, and the boundary conditions of the structure. Traveling w
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Bosworth, Kyle Judson. "Health Monitoring of the Veterans' Glass City Skyway: Vibrating Wire Strain Gage Testing, Study of Temperature Gradients and a Baseline Truck Test." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1197693985.

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Thesis (M.S.)--University of Toledo, 2007.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Master of Science in Civil Engineering." "A thesis entitled"--at head of title. Bibliography: leaves 86-87.
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21

Orelli, Paiva Guilherme. "Vibroacoustic Characterization and Sound Synthesis of the Viola Caipira." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1045/document.

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La viola caipira est un type de guitare brésilienne largement utilisée dans la musique populaire. Elle comprend dix cordes métalliques organisées en cinq paires, accordées à l'unisson ou à l'octave. Le travail de thèse porte sur l'analyse des spécificités des sons musicaux produits par cet instrument, peu étudié dans la littérature.L'analyse des mouvements des cordes pincées au moyen d'une caméra rapide montre l'importance des vibrations par sympathie qui donnent lieu à un halo sonore, constituant une signature perceptive importante. Ces mesures révèlent également l'existence de chocs entre co
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Benacchio, Simon. "Contrôle actif modal appliqué aux instruments de musique à cordes." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066537/document.

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Cette thèse se propose d’appliquer un contrôle actif modal aux instruments de musique de la famille des cordes. Les objectifs principaux sont de proposer une démarche et des méthodes adaptées permettant l’application de ce type de contrôle, d’explorer les possibilités qu’il offre et d’en étudier les effets sur les instruments. Tout d’abord, les types de contrôle existants et leurs applications aux instruments de musique sont rapidement présentés. Le constat que les paramètres modaux des instruments sont de bons descripteurs de ses attributs perceptifs mène à choisir la méthode de contrôle acti
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Sang, Alexander Kipkosgei. "Distributed Vibration Sensing using Rayleigh Backscatter in Optical Fibers." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77274.

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Sensing has been essential for the investigation, understanding, exploitation, and utilization of physical phenomena. Traditional single-point sensing methods are being challenged by the multi-point or distributed sensing capabilities afforded by optical fiber sensors. A powerful technique available for distributed sensing involves the use of the Optical Frequency Domain Reflectometry (OFDR). This work focuses on using OFDR as a means of obtaining distributed vibration measurements using the Rayleigh scatter along a single-mode optical fiber. The effort begins by discussing various distributed
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Zhou, Ding, and 周叮. "Three-dimensional vibration analysis of structural elements using Chebyshev-Ritz method." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B27511200.

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Kim, Joo-Woo. "A ritz variational procedure for three-dimensional vibroelasticity problems with singularities." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20222.

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Marklund, Emil. "Bostäder vid stränder och järnvägar - risker, attraktivitet och konflikter. Fallstudie: Öbacka strand i Umeå kommun." Thesis, Umeå universitet, Kulturgeografi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-89768.

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This study aims to analyze the risks with building new households between railroads and shore, the focus of the study lays on Öbacka strand in Umeå municipality. The study also investigate if a land use conflict has taken place and how it was handled. The paper is based on different documents that was central for the work of planning the households and some interviews with operators that was highly involved with the planning of the area. The results shows that there is several risks with establishing new household between railroads and shores. Mainly because of the exposure of noise from the r
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Malowicki, Mark. "Active Vibration Isolation Using an Induced Strain Actuator with Application to Automotive Seat Suspensions." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/9640.

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The characteristics of an automotive passenger seat in response to vibrational excitations are examined and an active vibration isolation system incorporating smart materials is designed, built, and tested. Human sensitivity to vibration is discussed. Characteristics of road roughness are discussed and used to implement a representative test input to a passenger seat system. extsc{Matlab} is used to model the car seat and vehicle system with four degrees of freedom to determine actuator requirements. Selection and implementation of a low--profile, prestressed piezoceramic device into an active
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Galea, Stephen C. P. "Effects of temperature and vibration on acoustically-induced strains and damage propagation in CFRP plates." Thesis, University of Southampton, 1989. https://eprints.soton.ac.uk/52247/.

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The effect of temperature on the material elastic properties, acoustically-induced strains, damage initiation, damage propagation and residual thermal strains of composite materials has been investigated. An experimental rig, using the free-free beam technique, was built to attain accurate measurements of Young's modulus and loss factor of CFRP beams in the temperature range -40oC to 150oC. These results were then compared with measurements taken from a commercially available Dynamic Mechanical Thermal Analyser. Using the finite element method a study was undertaken to determine the effect of
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Silva, Douglas Krüger da. "A física e os instrumentos musicais construindo significados em uma aula de acústica." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/174341.

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Este trabalho versa sobre desenvolver a habilidade de “reconhecer características ou propriedades de fenômenos ondulatórios ou oscilatórios, relacionando-os a seus usos em diferentes contextos” (BRASIL, 2009, p.8) de uma forma menos tradicional. O objetivo foi abordar o conteúdo de acústica utilizando instrumentos musicais (violão, guitarra, flauta, xilofone, lira...). A partir de ondas estacionárias em tubos sonoros e cordas vibrantes, foram elucidados os conceitos de altura, intensidade e timbre, relacionando com os conceitos básicos de ondas – frequência, comprimento de onda, amplitude, vel
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Shih, Hoi Wai. "Damage assessment in structures using vibration characteristics." Queensland University of Technology, 2009. http://eprints.qut.edu.au/30319/.

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Changes in load characteristics, deterioration with age, environmental influences and random actions may cause local or global damage in structures, especially in bridges, which are designed for long life spans. Continuous health monitoring of structures will enable the early identification of distress and allow appropriate retrofitting in order to avoid failure or collapse of the structures. In recent times, structural health monitoring (SHM) has attracted much attention in both research and development. Local and global methods of damage assessment using the monitored information are an inte
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lin, weiwei. "Creation and Evaluation of Polymer/Multiwall Carbon Nanotube Films for Structural Vibration Control and Strain Sensing Properties." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3025.

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Multifunctional materials both with damping properties and strain sensing properties are very important. They promise to be more weight-efficient, and provide volume-efficient performance, flexibility and potentially, less maintenance than traditional multi-component brass-board systems. The goal of this dissertation work was to design, synthesize, investigate and apply polyaniline/Multiwall carbon nanotube (PANI/MWCNT) and polyurethane (PU) /MWCNT composites films for structural vibration control and strain sensors using free layer damping methods and static and dynamic strain sensing test me
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AZEGAMI, Hideyuki, Tadashi OGIHARA, and Akiyasu TAKAMI. "Analysis of Uniform-Strength Shape by the Growth-Strain Method (Application to the Problems of Steady-State Vibration)." 日本機械学会, 1991. http://hdl.handle.net/2237/12158.

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Gur, S., S. K. Mishra, and G. N. Frantziskonis. "Thermo-mechanical strain rate-dependent behavior of shape memory alloys as vibration dampers and comparison to conventional dampers." SAGE PUBLICATIONS LTD, 2015. http://hdl.handle.net/10150/615541.

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A study on shape memory alloy materials as vibration dampers is reported. An important component is the strain rate-dependent and temperature-dependent constitutive behavior of shape memory alloy, which can significantly change its energy dissipation capacity under cyclic loading. The constitutive model used accounts for the thermo-mechanical strain rate-dependent behavior and phase transformation. With increasing structural flexibility, the hysteretic loop size of shape memory alloy dampers increases due to increasing strain rates, thus further decreasing the response of the structure to cycl
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Joyce, Andrea Lee. "Courtship acoustics and mating in Cotesia, a genus of parasitoid wasps." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1503.

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Greening, Jane Barbara. "Changed vibration threshold and loss of nerve movement in patients with repetitive strain injury : the peripheral neuropathology of RSI." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343565.

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Hong, Soonyoung. "An effective data mining approach for structure damage indentification." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1194903908.

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Jeřábek, Vojtěch. "Systém automatického ladění pro sedmistrunné kytary." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318192.

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The thesis describes a realization of the automatic self tuning system for sevenstring guitars. There are comparisons of commercial and uncommercial solutions for six-string guitars. There is also evaluation of useful parts for seven-string guitars. Thesis contains a description of a requirements for individual parts and a control software with respect on real guitar properties and used computing algorithm. In the second part of thesis, there is a description of final system design and its realisation including the control software. This is also related with testing of the entire system.
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Novák, Vlastimil. "Řídicí jednotka hydraulického čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228268.

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Vlastimil Novak Motor pump control unit DW, IAE, 2008, 48 pp. 54 fig. The terget of diploma work is measure od progression of vibration on motor pump control unit of electro-hydraulic servo unit placed on a vehicle. At first, a proposal of testing of vehicle for given characteristics have been created and placement of sensors and compare measured data of load of control unit in different vehicle ride modes.
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Herranz, Alvarez Juan F. "Minimisation of the wire position uncertainties of the new CERN vacuum wire scanner." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398303.

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The particle production of an accelerator is characterised by the accelerated species of particles, by their number and energy. The particle rate is determined by the production cross section, a natural constant and the accelerator dependent parameter luminosity. The luminosity is proportional to the number of particles in each beam and inversely proportional to the particle beam transverse dimensions. The luminosity increases with the particle beam density and therefore the probability of interactions too. To optimize the transverse beam sizes, profile monitors are used to measure parameter d
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Graziano, Maria. "Updating of Finite Element Models using static and dynamic optical strains with application to damage assessment." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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In the recent years, vibration-based structural damage identification has been subject of significant research in structural engineering. The basic idea of vibration-based methods is that damage induces mechanical properties changes that cause anomalies in the dynamic response of the structure, which measures allow to localize damage and its extension. Vibration measured data, such as frequencies and mode shapes, can be used in the Finite Element Model Updating in order to adjust structural parameters sensible at damage (e.g. Young’s Modulus). The novel aspect of this thesis is the introductio
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Kpeky, Fessal. "Formulation et modélisation des vibrations par éléments finis de type solide-coque : application aux structures sandwichs viscoélastiques et piézoélectriques." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0008/document.

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Cette thèse s’intéresse au développement d’éléments finis solide–coques dédiés à la modélisation de structures multicouches sollicitées en vibrations. En effet, la plupart des modèles multicouches dans la littérature présentent des limitations dans certaines configurations géométriques et matérielles. Face à ce constat et dans un souci de proposer un outil moins coûteux en temps de calcul, nous avons proposé une approche basée sur le concept solide–coques. Il s’agit d’éléments finis tridimensionnels dont le comportement a été amélioré par l’Assumed Strain Method. Dans un premier temps, nous av
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Kara, Mustafa Can. "Fluid-structure interaction (FSI) of flow past elastically supported rigid structures." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51931.

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Fluid-structure interaction (FSI) is an important physical phenomenon in many applications and across various disciplines including aerospace, civil and bio-engineering. In civil engineering, applications include the design of wind turbines, pipelines, suspension bridges and offshore platforms. Ocean structures such as drilling risers, mooring lines, cables, undersea piping and tension-leg platforms can be subject to strong ocean currents, and such structures may suffer from Vortex-Induced Vibrations (VIV's), where vortex shedding of the flow interacts with the structural properties, leading t
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Iizuka, Eduardo Kenji. "Analise de tensões em peneiras vibratorias atraves de modelagem numerica utilizando o metodo dos elementos finitos e experimentalmente por extensometria." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265004.

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Orientador: Paulo Roberto Gardel Kurka<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-06T16:26:05Z (GMT). No. of bitstreams: 1 Iizuka_EduardoKenji_M.pdf: 15704991 bytes, checksum: d25013321bbe7f7be9760b4235125e16 (MD5) Previous issue date: 2006<br>Resumo: O trabalho apresenta os resultados obtidos na simulação numérica e medição extensométrica de peneiras vibratórias de alta capacidade. Para o estudo numérico utilizou-se o software MSC.FEA 2005 que é uma integração dos softwares MSC.Patran e MSC.Nastran,
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Albahttiti, Mohammed T. "Freeze-thaw performance of prestressed concrete railroad ties." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20376.

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Doctor of Philosophy<br>Civil Engineering<br>Kyle Riding<br>Air voids are purposefully entrained in concrete to provide freeze-thaw durability of prestressed concrete railroad ties. Durability assurance requires consistent provision of an air void system comprised of small, well-distributed bubbles in sufficient quantity for durability and a quality control method for testing tie freeze-thaw durability. Manufacturing processes at three concrete manufacturing plants were investigated in order to determine the effects of process variability on resulting concrete air void system variability. Vari
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Dressler, Bernhard. "Modélisation numérique des coques en grandes transformations : mise en oeuvre dans un environnement orienté objet." Châtenay-Malabry, Ecole centrale de Paris, 1997. http://www.theses.fr/1997ECAP0522.

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Ce mémoire est consacré à la dynamique des coques en grandes rotations. La théorie bidimensionnelle des coques est déduite du principe des travaux virtuels d'un milieu continu tridimensionnel en introduisant la cinématique de Mindlin. On obtient un système d'équations non-linéaires qui est linéarise par rapport aux déplacements de la surface moyenne ainsi que par rapport aux paramètres de rotation. La paramétrisation des grandes rotations par le vecteur de rotation est comparée à la paramétrisation directe par la matrice de rotation. En vue d'une discrétisation en éléments finis isoparamétriqu
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Wegener, Dirk. "Ermittlung bleibender Bodenverformungen infolge dynamischer Belastung mittels numerischer Verfahren." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107948.

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In der Arbeit wird gezeigt, wie man die Bodensteifigkeit bei sehr kleinen Dehnungen sowie die Abnahme der Steifigkeit mit zunehmender Scherdehnung in Labor- und Feldversuchen ermitteln kann. Dazu werden typische Eigenschaften mineralischer und organischer Böden einschließlich Korrelationen zusammengestellt und wesentliche Unterschiede zum Bodenverhalten bei großen Dehnungen, insbesondere hinsichtlich der Steifigkeit und der Spannungsabhängigkeit aufgezeigt. Weiterhin wird dargelegt, wie man mit dem hypoplastischen Stoffgesetz mit intergranularen Dehnungen das Bodenverhalten bei kleinen Dehnung
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Ahmad, Naveed. "Passive Damping in Stiffened Structures Using Viscoelastic Polymers." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79566.

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Noise and vibration suppression is an important aspect in the design process of structures and machines. Undesirable vibrations can cause fatigue in a structure and are, therefore, a risk to the safety of a structure. One of the most effective and widely used methods of mitigating these unwanted vibrations from a system is passive damping, by using a viscoelastic material. This dissertation will primarily focus on constrained layer passive damping treatments in structures and the investigation of associated complex modes. The key idea behind constrained damping treatment is to increase damping
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Lalonde, Sébastien. "Stratégie de modélisation 3D des solides toronnés appliquée à l'étude de la fatigue des conducteurs de lignes de transport d'énergie électrique." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10497.

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Le vieillissement des lignes de transport d’énergie électrique est une problématique majeure des réseaux. D’ailleurs, des problèmes se posent au plan de l’évaluation de l’état des conducteurs qui, soumis aux vibrations éoliennes, sont vulnérables à l’endommagement en fatigue. Surtout présent aux pinces de suspension, ce phénomène est encore difficile à quantifier, notamment quant à la prédiction de la durée de vie résiduelle des conducteurs. D’autre part, avec le besoin croissant d’optimiser l’exploitation du réseau tout en maintenant sa fiabilité, une estimation précise de l’état d’endommag
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Werneck, Nicolau Leal. "Analise da distorção musical de guitarras eletricas." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259107.

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Orientador: Furio Damiani<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-11T03:06:29Z (GMT). No. of bitstreams: 1 Werneck_NicolauLeal_M.pdf: 1556046 bytes, checksum: 677310006250588d7e6a0fb0eedfc170 (MD5) Previous issue date: 2007<br>Resumo: Existem diversos problemas ligados à análise de sinais musicais que podem se beneficiar de um conhecimento mais detalhado da estrutura dos sinais gerados pelos diferentes instrumentos. Entre eles se destaca a compressão de sinais baseada em áudio estru
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Monteiro, Hugo Leonardo Salomão. "Análise de desempenho de diferentes leis de controle de vibrações torcionais em colunas de perfuração de poços de petróleo." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-26112012-084201/.

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O fenômeno de stick-slip, no processo de perfuração de poços de petróleo, é propiciado pela interação entre broca e formação rochosa e pode dar origem a grandes oscilações na velocidade angular podendo provocar danos irreparáveis ao processo. Neste trabalho, analisa-se o desempenho de leis de controle aplicadas à mesa rotativa (responsável por movimentar a coluna de perfuração), visando à redução de stick-slip e de oscilações da velocidade angular da broca. As leis de controle implementadas são do tipo PI (Proporcional-Integral), com parcelas de torque aplicado à mesa rotativa, proporcional e
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