Rozprawy doktorskie na temat „Shell vibration”
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McDaniel, James Gregory. "A new higher-order shell theory for vibration and viscoelastically-coated circular cylindrical shells". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15825.
Pełny tekst źródłaUstundag, Burak. "On the free vibration behavior of cylindrical shell structures". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67717.
Pełny tekst źródłaThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 105-106).
Shell structures, especially cylindrical shells, are widely used in aerospace and naval architectural industries. Submarine hulls and aircraft bodies can be idealized as cylindrical shell structures. The study of vibrations of cylindrical shells is an important aspect in the successful applications of the cylindrical shells. The free vibration characteristics of a submarine hull have an important influence on the noise signature of the submarine. That makes the free vibration problem of the submarine hull a particular interest for the submarine community. The natural frequencies of cylindrical shells are clustered in a very narrow band and they are thus more prone to becoming involved in resonant vibrations. The determination and control of these frequencies is significant to manage the acoustic signature of the submarine. This thesis focuses on the free vibration characteristics of stiffened and unstiffened cylindrical shells. The analysis is carried out mainly in two parts. First, the unstiffened cylindrical shell is modeled and the free vibration problem is analyzed as the shell thickness decreases. Then the cylindrical shell is stiffened with ring stiffeners and the free vibration problem of the stiffened cylindrical shell is studied. The vibration modes of the unstiffened cylindrical shell are studied for four shells with different thicknesses. Initial tensile and compressive membrane stresses are applied separately to the shells to study the effect of the initial stresses on the free vibration modes. The vibration modes of the stiffened cylindrical shell are studied in two steps. First, the influence of the positions of two ring stiffeners on the fundamental frequencies is studied; second, the free vibration modes of the stiffened cylindrical shell are studied. Two cylindrical shells with different thicknesses are used and they are stiffened with different numbers of ring stiffeners, which are uniformly distributed along the longitudinal axis of the shell. The results are compared with available analytical results and finite element solutions of similar problems from the literature.
by Burak Ustundag.
S.M.
Mustafa, B. A. J. "Free vibration analysis of stiffened circular shells". Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/14141.
Pełny tekst źródłaDewi, Fata Dwi Endyana Jr. "Three-Dimensional Analysis of Wave Attenuation by Anchored Hemicylindrical Shell". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35761.
Pełny tekst źródłaMaster of Science
Van, Zyl Marilize. "Prediction of flow-induced vibration in shell-and-tube heat exchangers". Diss., University of Pretoria, 2004. http://hdl.handle.net/2263/28055.
Pełny tekst źródłaDissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2006.
Mechanical and Aeronautical Engineering
unrestricted
Shaw, Christopher Edward. "The effects of imperfections on the acoustic scattering of a coated shell". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17903.
Pełny tekst źródłaNasir, Azhar Mahmood. "Axisymmetric shell structures for multi-use". Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/36147/1/36147_Digitised%20Thesis.pdf.
Pełny tekst źródłaHuang, He. "Large-Amplitude Vibration of Imperfect Rectangular, Circular and Laminated Plate with Viscous Damping". ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1924.
Pełny tekst źródłaPlattenburg, Joseph Allan. "Development of Refined Analytical Vibration Models for Plates and Shells with Combined Active and Passive Damping Treatments". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460578500.
Pełny tekst źródłaLo, Hung-Chieh. "Vibration Characteristics of Thin-Walled Noncircular Composite Cylinders". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77207.
Pełny tekst źródłaPh. D.
Jha, Akhilesh K. "Vibration Analysis and Control of an Inflatable Toroidal Satellite Component Using Piezoelectric Actuators and Sensors". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/28243.
Pełny tekst źródłaPh. D.
Woolfe, Katherine. "A scaled physical model for underwater sound radiation from a partially submerged cylindrical shell under impact". Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44874.
Pełny tekst źródłaXu, Mubing. "Adaptive-passive and active control of vibration and wave propagation in cylindrical shells using smart materials". Akron, OH : University of Akron, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1123211712.
Pełny tekst źródła"August, 2005." Title from electronic dissertation title page (viewed 12/27/2005) Advisor, Pizhong Qiao; Co-Advisor, Gangbing Song; Committee members, Wieslaw K. Binienda, Kevin L. Kreider, Paul C. K. Lam, Dane Quinn; Department Chair, Celal Batur, Wieslaw K. Binienda; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome Includes bibliographical references.
Molloy, Sean J. "Finite Element Analysis of a Pair of Leaning Pressurized Arch-Shells Under Snow and Wind Loads". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36608.
Pełny tekst źródła
The behavior of a pair of pressurized leaning arch-shells with various tilt angles, boundary conditions, and loads is investigated numerically. Several types of loads are considered, including uniformly-distributed vertical loads applied over all or half of the structure (representing snow), and wind loads on the structure. The arches are pinned or fixed to the ground. Deflections, vibrations, and stability of the structures are investigated using the finite element method. The effect of the tilt angle on the response is examined, and buckling may occur for some tilt angles under vertical loading. This type of structure has not been used widely, but may be effective for various applications.
Master of Science
Caresta, Mauro Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Structural and acoustic responses of a submerged vessel". Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44404.
Pełny tekst źródłaDavid, Claire. "Modélisation de coques composites multicouches". Cachan, Ecole normale supérieure, 1996. http://www.theses.fr/1996DENS0027.
Pełny tekst źródłaNilsson, Carl-Magnus. "Waveguide Finite Elements Applied on a Car Tyre". Doctoral thesis, KTH, Aeronautical and Vehicle Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3812.
Pełny tekst źródłaStructures acting as waveguides are quite common withexamples being, construction beams, fluid filled pipes, railsand extruded aluminium profiles. Curved structures like cartyres and pipe-bends may also be considered as waveguides. Wavesolutions in such structures may be found by a method calledthe Waveguide Finite Element Method or WFEM. This method uses afinite element approach on the cross-section of a waveguide tomodel the vibro-acoustic response as a set of linear, coupled,one dimensional, wave-equations.
In this thesis six novel waveguide finite elements arederived and validated. These elements are, straight and curvedpre-stressed, orthotropic or anisotropic shell elements,straight and curved fluid elements, and straight and curvedfluid-shell coupling elements.
Forced response and input power calculations for infiniteand periodic waveguides are presented. The assembled waveguidemodels can also serve as input for the Super Spectral FiniteElement Method, which enables forced response calculations formore complex boundaries. Furthermore, several properties ofdamped and undamped wave solutions are investigated.
Finally, a car tyre model, encompassing for the highlyanisotropic material and the air cavity inside the tyre is setforth. A number of forced response calculations for this modelare presented and compared with measurements with goodagreement.
Keywords:wave equation, wave solution, waveguide,finite element, spectral finite element, tyre noise, tyrevibration, input power, shells, pre-stress, fluid-shellcoupling axi-symmetric, two-and-half-dimensional
Fégeant, Olivier. "Noise from wind turbines". Doctoral thesis, KTH, Byggnader och installationer, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3100.
Pełny tekst źródłaQC 20100616
Martinet, Quentin. "Étude des effets environnementaux sur les modes acoustiques confinés de nanoparticules par diffusion inélastique de la lumière". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1152/document.
Pełny tekst źródłaOver the past twenty years, inelastic light scattering by vibrational eigenmodes of nanoparticles, called Lamb modes, has proven to be an effective method for characterizing the size and mechanical properties of nano-objects. The resonant frequency of a nano-sphere, in the gigahertz range, is given, as a first approximation, by the ratio of the acoustic velocity of the bulk material and the size of confinement. The refinements of the theoretical model allow to obtain, from these eigenmodes, information on the shape and local environment of nano-objects.The objective of this thesis is to probe the domain of validity of the Lamb model, to analyze the different impacts of the environment on eigenmodes and to develop a new strategy to measure them. Several aspects of interaction with the external medium can be considered depending on the system studied. On the one hand, the delocalization of the acoustic wave in the case of core shell systems is ruled by the acoustic impedance of the core and the shell and leads to a mechanical coupling. On the other hand, the inertial mass effect induced by the presence of organic ligands on the surface of the particle modifies the resonant frequency. The validity of both approaches is discussed according to the configuration and these models are applied to real cases, such as semiconductor core shell nanoparticles and nanoplatelets, or gold colloidal clusters. The inertial mass effect is significant for small objects and it is shown the feasibility to realize ultra-sensitive nano-balance capable of probing the local environment of nano-objects. Furthermore, in the case of gold clusters, this approach makes it possible to discuss the limit of the Lamb model, based on continuum mechanics, to interpret vibrations involving only six atoms. Thanks to low frequency Raman spectroscopy, it appears that the experimental results are in good agreement with both the continuum mechanics approach, by considering the inertial mass effect, and also with density functional theory (DFT) calculations. Finally, the experimental development of an optical set-up capable of measuring low frequency Raman modes on a single nanoparticle in a liquid medium is presented. This technic requires to localize a nanoparticle in a liquid medium with plasmonic tweezers and to enhance the low frequency Raman signal by stimulating vibrational modes with electrostriction. The perspectives are to apply this method to the dynamical study of a single object such as viruses or proteins
Talmant, Maryline. "Retrodiffusion d'une impulsion ultrasonore breve par une coque cylindrique a paroi mince". Paris 7, 1987. http://www.theses.fr/1987PA077164.
Pełny tekst źródłaGautier, François. "Contribution a l'etude du comportement vibroacoustique des instruments de musique a vent". Le Mans, 1997. http://www.theses.fr/1997LEMA1016.
Pełny tekst źródłaXu, Bo. "Vibration and stability analysis of toroidal shells". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ45257.pdf.
Pełny tekst źródłaShahla, Wajih. "Finite element analysis of the statics of, and vibrations in, axisymmetric shells". Thesis, Aston University, 1985. http://publications.aston.ac.uk/16662/.
Pełny tekst źródłaTimarci, Taner. "Vibrations of composite laminated cylindrical shells". Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283227.
Pełny tekst źródłaCalbris, Gaëtan. "Dynamique thermique et vibrationnelle de nanoparticules d'or et Au@SiO2 en régime femtoseconde : effet de la nanostructuration". Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14213/document.
Pełny tekst źródłaTypically, a good thermal conductor is also a good electrical conductor (Wiedemann-Franz). For several applications, it is imperative to be able to decouple these two properties. Nanostructuration allows for the modification of thermal properties without affecting electrical properties. This thesis is concerned with the synthesis and characterization of nanocomposites made from an insulating matrix impregnated with metallic nanoparticles. The elaborated nanocomposite is assembled from core@shell nanoparticles (Au@SiO2 or Au@Thiol) structured in an artificial opal by the "Langmuir" method. When the nanoparticle concentration is sufficiently high, certain authors predict an amplification of thermal transport in the nanocomposite. The radiative near-field coupling, largely plasmonic, constitutes a new mechanism for heat transport. In this work, we have studied the energy transfer within isolated nanoparticles and in arrays. First, we present chemical synthesis techniques used for the nanocomposites conception and detailed their optical properties. Then, we present the conception of the experimental set-up; a multicolor femtosecond pump-probe Imaging system permitting studies in reflection or transmission. These experiments permit us to study the electronic temperature dynamics of gold nanoparticles in different environments and to measure core@shell system's acoustic vibrational modes femtosecond laser excitation
Li, Nong. "Vibration of laminated orthotropic composite plates and shells". Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6946.
Pełny tekst źródłaAlizadeh, Y. "Free vibration of partially supported plates and shells". Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/10751.
Pełny tekst źródłaCAVALCANTI, LILIAN DE VASCONCELLOS. "BUCKLING AND VIBRATION ANALYSIS OF SHALLOW CONOIDAL SHELLS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24636@1.
Pełny tekst źródłaEstruturas de cascas delgadas descritas por superfícies regradas têm sido frequentemente utilizadas em engenharia civil, devido ao fato de que elas são uma das soluções estruturais mais econômicos para cobrir grandes vãos. Superfícies regradas são obtidas pelo movimento de uma ou mais linhas ao longo de uma ou mais curvas. Sendo assim, elas são fáceis de construir, o que justifica a sua escolha em muitos casos. Por razões estéticas e estruturais, estas estruturas são geralmente superfícies abatidas, o que leva, como no caso de arcos abatidos, a uma forte não linearidade geométrica. Entre as cascas descritas por superfícies regradas, as cascas conoidais são frequentemente favorecidas para coberturas de grandes áreas livres de colunas, pela facilidade de construção, elegância estética e pelo bom fornecimento de luz natural. Uma casca conoidal é um caso especial de cilindróide, pertencente às superfícies de Catalan, e é gerada por uma linha reta em movimento paralelo a um plano, conhecido como o plano diretor, com uma de suas extremidades em uma curva plana e a outra em uma linha reta. Por vezes, uma parte da superfície conoidal no extremo reto é suprimida dando origem a uma configuração truncada. O objetivo deste trabalho é analisar, utilizando uma formulação de elementos finitos, as características de flambagem e vibração desta forma estrutural. Uma análise paramétrica detalhada é realizada para compreender a influência das condições de contorno e dimensões físicas da casca no seu comportamento estático e dinâmico. São apresentadas conclusões específicas no final do trabalho, para resumir os resultados do presente estudo, que pretende servir como importante subsídio para os engenheiros envolvidos na construção de estruturas similares.
Slender shell structures described by ruled surfaces have been frequently used in civil engineering due to the fact that they are one of the most economical structural solutions to cover large spans. Ruled surfaces are obtained by the movement of one or more lines along one or more curves. So they are easy to cast, which justifies their choice in many cases. For aesthetic and structural reasons these structures are usually shallow surfaces, which leads, as in the case of shallow arches, to a strong geometric nonlinearity. Among the shells described by ruled surfaces, conoidal shells are frequently favored as roofing units to cover large column-free areas due to the ease of fabrication, aesthetic elegance and good provision of natural light. A conoidal shell is a special case of cylindroids belonging to Catalan’s surfaces and is generated by a variable straight line moving parallel to a plane, known as the director plane, with one of its ends on a plane curve and the other on a straight line. Sometimes a part of the conoidal surface at the straight end is cut off giving a truncated configuration. The objective of this work is to analyze, using a finite element formulation, the buckling and vibration characteristics of this structural form. A detailed parametric analysis is conducted to understand the influence of boundary conditions, different spans, widths, and other physical dimensions on the static and dynamic characteristics of the structure. Specific conclusions are drawn at the end, to summarize the contributions of the present investigation, which are expected to serve as important design aids to engineers engaged in shell construction.
Chern, Yi-Tzong. "Forced vibration analysis of plates and shallow shells". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236861764.
Pełny tekst źródłaDu, Hung-Yih Isaac. "Vibration and buckling of geometrically imperfect laminated cylindrical shells /". The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487326511716282.
Pełny tekst źródłaShute, Marcus William Sr. "Polarization-maintaining optical fiber as a sensor of shell vibrations". Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17915.
Pełny tekst źródłaGlandier, Christian Y. "Wave-vector analysis of the vibrations of thin cylindrical shells". Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/16797.
Pełny tekst źródłaDressler, 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.
Pełny tekst źródłaJAREK, AMANDA. "ENRICHED FINITE ELEMENTS FOR BUCKLING AND VIBRATION OF SHELLS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10410@1.
Pełny tekst źródłaO presente trabalho avalia a utilização de elementos enriquecidos para obtenção de cargas críticas, freqüências de vibração e seus respectivos modos de peças estruturais bidimensionais (flexão de placas retangulares sujeitas a compressão em seu plano). O método de aproximação empregado foi o de Rayleigh-Ritz voltado para o uso de elementos finitos convencionais enriquecidos com funções de deslocamentos adicionais internas e de contorno. As funções ditas internas são desenvolvidas de forma a não envolver deslocamentos e rotações nodais e no contorno. Já as funções ditas de contorno são concebidas de forma a envolver apenas deslocamentos internos e ao longo de um lado apenas, sem deslocamentos generalizados nodais. Para este estudo foram desenvolvidas duas famílias de funções, uma com termos adicionais trigonométricos e outra com termos adicionais polinomiais. Para o cálculo de cargas críticas e freqüências são utilizadas as matrizes de rigidez elástica, rigidez geométrica e de massa, introduzidas em problemas generalizados de autovalores. Resultados numéricos são obtidos através de procedimentos computacionais utilizando o software Maple. Verifica-se que as funções adicionais trigonométricas, embora mais satisfatórias que as polinomiais quanto à convergência, exigem maior esforço computacional. São comparados resultados de elementos para placas esbeltas (teoria de Kirchhoff), com três e quatro graus de liberdade por nó, onde o quarto grau de liberdade corresponde à derivada mista (torção). Mostra-se que as funções adicionais, não-nodais, requerem o uso do elemento com quatro graus de liberdade por nó, para se ter convergência no cálculo das cargas críticas e freqüências em situações gerais. Outros exemplos abordam preliminarmente a inclusão de efeitos de dano e ortotropia no material, visando a modelagem de lajes comprimidas e pilares com seções retangulares alongadas. Esta modelagem envolvendo combinação de funções adicionais gerais e elementos convencionais representa um passo no desenvolvimento de uma técnica aplicável à combinação de modos globais e localizados de instabilidade
The focus of the present work is to developand evaluate enriched elements used to obtain critical loads, frequencies of vibration and respective modes for two-dimensional structural components (rectangular plates in bending under inplane compressive loading). The Rayleigh-Ritz approximation method has been employed, directed to the use of conventional finite elements enriched by internal and boundary additional displacements functions. The socalled internal functions are do not involve nodal and boundary displacements and rotations. The boundary functions are conceived to include displacements within the element and along one side, without involving any generalized nodal displacements. Two displacement function families were developed, the first with trigonometric additional terms and the second with polynomial additional terms. Critical loads and frequencies, and respective modes, are obtained by the use of elastic stifiness, geometric, and mass matrices, introduced in generalized eigenvalue problems. Numerical results are obtained by computational procedures using Maple software. The trigonometric additional functions, in spite of better convergence properties, demand greater computational effort. The basic elements are classical thin plate elements (Kirchhoff's theory) with three or four degrees of freedom per node, where the fourth degree of freedom corresponds to the mixed derivative (torsion). The results indicate that non- nodal additional functions require the use of elements with four freedom degrees by node to obtain convergence of critical loads and frequencies convergence in general situations. Other examples consist of preliminary approaches to include damage effects, in reinforced orthotropic plates, as modeling columns with wide rectangular sections and compressed slabs. The use of general additional functions combined with conventional elements represents a step on the development of a technique applicable to global and localized instability modes.
El-Mously, Mohey El-Deen Mahmoud. "Free vibration of cylindrical and hyperboloidal cooling-tower shells". Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627437.
Pełny tekst źródłaAwrejcewicz, Jan, Lidiya Kurpa i T. Shmatko. "Vibration of functionally graded shallow shells with complex shape". Thesis, Department of Automation, Biomechanics and Mechatronics, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37081.
Pełny tekst źródłaVautier, Isabelle. "Influence du contact unilatéral sur le comportement vibratoire de coques soudées par points". Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0363.
Pełny tekst źródłaChiambaretto, Pierre-Louis. "Modèle vibratoire de réservoir cryotechnique de lanceur : définition d’un méta-matériau équivalent". Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0022/document.
Pełny tekst źródłaLiquid hydrogen is a propellant alternatively used with liquid oxygen for the propulsion of many launchers, especially those of the Ariane family. However, its dangerousness prohibits vibration tests on filled tank. The aim of this PHD is to explore the possibility to carry out such vibration tests by filling these tanks with a substitute material : a set of pre-stressed balls. As further argued and developed in the report, the objective is to obtain a modal behavior similar in term of mode shapes and natural frequencies to those of the tank filled with liquid hydrogen for the first modes. In the first part, an analytical approach based on a method using frequency equivalences is detailed. After presenting the outlines of the methodology used and all the models developed, the methodology is applied to the experimentally studied case in order to highlight the influence of the different parameters as well as then to propose a first method to choose a set of well adapted balls. The second part deals mainly with experimental and numerical aspects. Firstly, the balls used in the thesis are characterized. Then, the experimental set-up designed and realized to carry out vibration tests on a tank filled with pre-stressed balls is presented. The different results obtained are compared with both analytical results and numerical based on discrete-elements and finite-elements results
Bardell, N. S. "Wave propagation in periodically stiffened plates and shells". Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256281.
Pełny tekst źródłaKil, Hyun-Gwon. "An automated scanning laser doppler system for vibration measurements and wave-vector analysis of vibration of shells". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/16856.
Pełny tekst źródłaGhaeadi, Sirous K. "Control of vibrations of shells using piezoelectric actuators". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0018/NQ55333.pdf.
Pełny tekst źródłaLandman, Irina M. "Asymptotic analysis of vibrations of thin cylindrical shells". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/MQ54326.pdf.
Pełny tekst źródłaSOARES, ALEXANDRE ANDRADE BRANDAO. "NONLINEAR FREE VIBRATIONS OF FUNCTIONALLY GRADED CYLINDRICAL SHELLS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35622@1.
Pełny tekst źródłaCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Cascas cilíndricas são usadas em muitas aplicações de engenharia e, devido a sua forma e capacidade de transporte de carga, são bastante usadas na indústria aeroespacial e em estruturas civis. Elas minimizam a quantidade de material do qual são fabricadas, tornando-se assim estruturas muito leves e esbeltas. Em décadas recentes tem se procurado criar novos materiais que conjuguem múltiplas propriedades como maior resistência, melhor proteção térmica, proteção contra corrosão e adequado nível de amortecimento, dentre outras. Uma classe de materiais que podem atender simultaneamente várias destas exigências é o chamado material com gradação funcional, onde as propriedades do material variam de forma contínua em uma ou mais direções. Materiais com gradação funcional são particularmente indicados para a construção de cascas. Como a maioria destas estruturas estão sujeitas a cargas dinâmicas, torna-se importante o estudo do comportamento dinâmico de cascas fabricadas com materiais com gradação funcional. O objetivo deste trabalho é estudar as vibrações não lineares de cascas cilíndricas esbeltas com gradação funcional. Para isto utiliza-se a teoria não linear de cascas de Sanders, considerada uma das teorias mais precisas para a análise de cascas esbeltas. Inicialmente, derivam-se as equações de movimento considerando um estado de tensões iniciais. Usando as equações linearizadas, obtêm-se às frequências naturais e as cargas críticas, sendo estes resultados comparados favoravelmente com resultados encontrados na literatura para materiais homogêneos e com gradação funcional. A seguir, usando uma expansão modal que atende as condições de contorno e continuidade, além de expressar os acoplamentos modais característicos de cascas cilíndricas no regime não linear, as equações de movimento são discretizadas usando-se o método de Galerkin. As equações algébricas resultantes são resolvidas pelo método de Newton-Raphson, sendo assim obtida a relação não linear frequência-amplitude. Finalmente, realiza-se uma análise paramétrica para estudar a influência da geometria da casca, da gradação do material funcional e dos modos de vibração no grau e tipo de não linearidade da casca cilíndrica, sendo esta a principal contribuição deste trabalho de pesquisa.
Cylindrical shells are used in many engineering applications and, due to its shape and load carrying capacity, are frequently used in aerospace and civil structures. They minimize the amount of material from which they are manufactured, thus making it a very lightweight and slender structure. In recent decades, there has been a search for new materials that combine multiple properties such as increased strength, better thermal protection, corrosion protection and appropriate damping level, among others. A material that can meet several of these requirements simultaneously is the so called functionally graded material, where the material properties vary continuously in one or more directions. Functionally graded materials are particularly suitable for the construction of shells. As most of these structures are subjected to dynamic loads, it is important to study the dynamic behavior of shells made of functionally graded materials. The objective of this work is to study the nonlinear vibrations of slender functionally graded cylindrical shells. For this, the Sanders non-linear shell theory, which is considered one of the most precise theories for the analysis of slender shells, is adopted. Initially, the equations of motion are derived considering an initial stress state. Using the linearized equations of motion, the natural frequencies and critical loads are obtained. These results compare favorably with results reported in the literature for homogeneous and functionally graded shells. Then, using a modal expansion that satisfies the boundary and continuity conditions and expresses the modal couplings characteristic of cylindrical shells in the nonlinear regime, the equations of motion are discretized using the Galerkin method. The resulting algebraic equations are solved by the Newton-Raphson method, thus obtaining the nonlinear frequency-amplitude relation. Finally, a parametric analysis is conducted to study the influence of the geometry of the shell, the gradient of the functional material and vibration modes on the degree and type of nonlinearity of the cylindrical shell, which is the main contribution of this research work.
Yavuzbalkan, Erdem. "Free Vibration Analysis Of Anisotropic Laminated Composite Shells Of Revolution". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606505/index.pdf.
Pełny tekst źródła#8217
s principle. The derived governing equations for the free vibration analysis of ALCSOR are initially formulated into a system of partial differential equations in terms of fundamental variables. Then, those partial differential equations are reduced to a system of first order ordinary differential equations by applying finite exponential Fourier Transform method resulting in a two point boundary value problem. It has been demonstrated that the application of the finite exponential Fourier transform made it possible to solve the governing equations, comprising the full anisotropic form of the constitutive equations, which was otherwise impossible to solve with the classical Fourier decomposition method. First, the boundary value problem formulated is reduced to a series of initial value problems, then the multisegment numerical integration is used in combination with the frequency trial method in order to find the critical modes within a given range of natural frequencies. A computer code DALSOR is written for the solution of the natural frequencies and mode shapes of mascroscopically ALCSOR. DALSOR is applicable to any general boundary condition at both ends of the shell, and allows for variation of all elastic and geometric properties in the meridional direction. Numerical results are presented, and mainly discussions on the method of solution and the effect of macroscopic anisotropy on modal characteristics, mainly natural frequencies, are made. Various case studies are performed primarily on cylindrical shells in order to investigate the effects of mainly fiber orientation angle, stacking sequence, arbitrary boundary conditions at the edges of the shell, thickness-to-radius ratio on the modal characteristics, mainly natural frequencies. Application of the method of solution has also been demonstrated for a truncated composite spherical shell.
Wang, X. H. "Free vibration and stability of complete orthotropic circular toroidal shells". Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26799.
Pełny tekst źródłaQatu, Mohamad Subhi Khalil. "Free vibration and static analysis of laminated composite shallow shells". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392112808.
Pełny tekst źródłaQatu, Mohamad-Subhi Khalil. "Free vibration and static analysis of laminated composite shallow shells /". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487670346875409.
Pełny tekst źródłaYoung, Andrew J. "Active control of vibration in stiffened structures". Title page, contents and abstract only, 1995. http://hdl.handle.net/2440/37722.
Pełny tekst źródłaThesis (Ph.D.)--Mechanical Engineering, 1995.
Roberts, G. W. "Vibrations of shells and their relevance to musical instruments". Thesis, Bucks New University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376443.
Pełny tekst źródłaAlhazza, Khaled. "Nonlinear Vibrations of Doubly Curved Cross-PLy Shallow Shells". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/30042.
Pełny tekst źródłaPh. D.