Дисертації з теми "Mechanism vibration"
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George, Lynnane E. "Active vibration control of a flexible base manipulator." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17115.
Повний текст джерелаRahman, M. Shafiqur. "A Hybrid Technique of Energy Harvesting from Mechanical Vibration and Ambient Illumination." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2220.
Повний текст джерелаMagee, David Patrick. "Optimal arbitrary time-delay filtering to minimize vibration in elastic manipulator systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/15891.
Повний текст джерелаLoper, Jeffrey Cameron. "Vibration cancellation an disturbance rejection in serially linked micro/macro manipulators." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15873.
Повний текст джерелаNovosád, Ivan. "Šestiválcový řadový vznětový motor s vypínáním válců." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417519.
Повний текст джерелаUnsal, Memet. "Semi-active vibration control of a parallel platform mechanism utilizing magnetorheological damping." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013824.
Повний текст джерелаHuey, John. "Dynamics and vibration control of large area manipulators." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16469.
Повний текст джерелаHuang, Ya. "Mechanism of nonlinear biodynamic response of the human body exposed to whole-body vibration." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/64575/.
Повний текст джерелаEndo, Jun. "Mechanism and function of synchronized hatching in Pentatomidae (Insecta: Heteroptera)." Kyoto University, 2018. http://hdl.handle.net/2433/232287.
Повний текст джерелаČep, David. "Klikový mechanismus plynového vidlicového šestnáctiválce." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229090.
Повний текст джерелаTegge, Samuel. "The Mechanism of Biotremor Production in the Veiled Chameleon (Chamaeleo calyptratus)." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2336.
Повний текст джерелаHolzinger, Felix [Verfasser]. "Coupling of tip leakage flow and blade vibration in transonic compressors : Mechanism and countermeasures / Felix Holzinger." Aachen : Shaker, 2018. http://d-nb.info/1159835063/34.
Повний текст джерелаRose, Kyle. "Synthesis, Phase Development, and the Mechanism for Negative Thermal Expansion in Aluminum Tungstate." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703275/.
Повний текст джерелаVignotto, Davide. "Analysis of the in-Flight Performance of a Critical Space Mechanism." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/323575.
Повний текст джерелаYe, Zhou. "Mechanism and the Effect of Microwave-Carbon Nanotube Interaction." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc4919/.
Повний текст джерелаYun, Yuan. "Kinematics, dynamics and control analysis for micro positioning and active vibration isolation using parallel manipulators." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2542954.
Повний текст джерелаDucheček, Martin. "Čtyřválcový řadový vznětový motor s excentrickým klikovým mechanismem pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232116.
Повний текст джерелаJöcker, Markus. "Numerical Investigation of the Aerodynamic Vibration Excitation of High-Pressure Turbine Rotors." Doctoral thesis, KTH, Energy Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3416.
Повний текст джерелаThe design parameters axial gap and stator count of highpressure turbine stages are evaluated numerically towards theirinfluence on the unsteady aerodynamic excitation of rotorblades. Of particular interest is if and how unsteadyaerodynamic considerations in the design could reduce the riskofhigh cycle fatigue (HCF) failures of the turbine rotor.
A well-documented 2D/Q3D non-linear unsteady code (UNSFLO)is chosen to perform the stage flow analyses. The evaluatedresults are interpreted as aerodynamic excitation mechanisms onstream sheets neglecting 3D effects. Mesh studies andvalidations against measurements and 3D computations provideconfidence in the unsteady results. Three test cases areanalysed. First, a typical aero-engine high pressure turbinestage is studied at subsonic and transonic flow conditions,with four axial gaps (37% - 52% of cax,rotor) and two statorconfigurations (43 and 70 NGV). Operating conditions areaccording to the resonant conditions of the blades used inaccompanied experiments. Second, a subsonic high pressureturbine intended to drive the turbopump of a rocket engine isinvestigated. Four axial gap variations (10% - 29% ofcax,rotor) and three stator geometry variations are analysed toextend and generalise the findings made on the first study.Third, a transonic low pressure turbine rotor, known as theInternational Standard Configuration 11, has been modelled tocompute the unsteady flow due to blade vibration and comparedto available experimental data.
Excitation mechanisms due to shock, potential waves andwakes are described and related to the work found in the openliterature. The strength of shock excitation leads to increasedpressure excitation levels by a factor 2 to 3 compared tosubsonic cases. Potential excitations are of a typical wavetype in all cases, differences in the propagation direction ofthe waves and the wave reflection pattern in the rotor passagelead to modifications in the time and space resolved unsteadypressures on the blade surface. The significant influence ofoperating conditions, axial gap and stator size on the wavepropagation is discussed on chosen cases. The wake influence onthe rotorblade unsteady pressure is small in the presentevaluations, which is explicitly demonstrated on the turbopumpturbine by a parametric study of wake and potentialexcitations. A reduction in stator size (towards R≈1)reduces the potential excitation part so that wake andpotential excitation approach in their magnitude.
Potentials to reduce the risk of HCF excitation in transonicflow are the decrease of stator exit Mach number and themodification of temporal relations between shock and potentialexcitation events. A similar temporal tuning of wake excitationto shock excitation appears not efficient because of the smallwake excitation contribution. The increase of axial gap doesnot necessarily decrease the shock excitation strength neitherdoes the decrease of vane size because the shock excitation mayremain strong even behind a smaller stator. The evaluation ofthe aerodynamic excitation towards a HCF risk reduction shouldonly be done with regard to the excited mode shape, asdemonstrated with parametric studies of the mode shapeinfluence on excitability.
Keywords:Aeroelasticity, Aerodynamics, Stator-RotorInteraction, Excitation Mechanism, Unsteady Flow Computation,Forced Response, High Cycle Fatigue, Turbomachinery,Gas-Turbine, High-Pressure Turbine, Turbopump, CFD, Design
Bills, Kyle. "Mechanoreceptor Activation in the Treatment of Drug-Use Disorders: Mechanism and Outcome." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8627.
Повний текст джерелаČernohous, Tomáš. "Dvouválcový řadový vznětový motor s excentrickým klikovým mechanismem pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232050.
Повний текст джерелаMoghaddas, Mohamad Amin. "On the Mechanism of the Ultrasonic-Assisted Drilling Process." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534723108853497.
Повний текст джерелаQiu, Donghai. "Theoretical and experimental study of tuned nonlinear energy sink : application to passive vibration control." Thesis, Toulouse, INSA, 2018. http://www.theses.fr/2018ISAT0029/document.
Повний текст джерелаThe work presented in this thesis deals with the passive control of dynamics systems subjected to harmonic and transient excitations using a Nonlinear Energy Sink (NES). Several research aspects have been developed: design theory and experimental study of a novel NES, efficient Targeted Energy Transfer (TET) of bistable NES and design criteria for optimally tuned Vibro-Impact (VI) NES. Firstly, a design criterion intended to provide optimal nonlinear stiffness is proposed. Then a novel design of NES system yielding cubic stiffness with conical springs or variable pitch springs and negative stiffness mechanism is developed. Secondly, the experimental procedures for static and dynamic test are presented and applied to validate the concept of NES system. Then a sensitivity analysis is performed with respect to the pre-compressed length of springs. Thirdly, the optimal design of the above device with negative stiffness (termed as bistable NES) is studied. This type of NES is proved to work robustly for different types of excitation, and experimental study of semi-active control are explored. Finally, design criteria for optimally tuned VI NES are studied. Detailed analytical calculations of clearance to control the vibration under different excitations are proposed. A good correspondence between theoretical and experimental results is observed
Izuka, Jaime Hideo 1974. "Modelo e teste experimental para o controle de vibração de vigas longas deformadas." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264567.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-23T11:40:22Z (GMT). No. of bitstreams: 1 Izuka_JaimeHideo_D.pdf: 4550690 bytes, checksum: d283c500cecbc7a038784ba35f0f73df (MD5) Previous issue date: 2013
Resumo: A utilização de braços manipuladores flexíveis em veículos de exploração foi o motivador deste trabalho. Estas estruturas têm como vantagens a sua massa reduzida e a capacidade de suportar grandes deformações sem que o limite de elasticidade seja excedido. O controle das vibrações de sua extremidade livre é essencial para uma aplicação prática. Neste contexto, este trabalho tem como objetivo a determinação de um modelo dinâmico para uma estrutura longa e flexível, visando o seu controle de vibração. A estrutura considerada possui seção variável, semelhante a uma viga telescópica. Considera-se ainda que a estrutura esteja sujeita a uma grande deformação causada pelas ações de tendão de tração, peso próprio e cargas concentradas. O modelo dinâmico consiste na adaptação de uma malha de elementos finitos de baixa ordem à configuração da linha de deformação estática da viga. A vibração a ser controlada consiste das pequenas oscilações que ocorrem em torno da posição de equilíbrio da viga deformada. O modelo dinâmico encontrado para a estrutura é utilizado no projeto de um controlador de vibrações, ativado por forças exercidas no tendão de tração, responsável pela deformação estática da própria viga. Comparações com a literatura, bem como resultados experimentais comprovam a validade do modelo empregado para a caracterização do sistema. Simulações numéricas mostram o sucesso de uso do modelo no projeto de um controlador ativo de vibrações
Abstract: The use of flexible manipulator arms in exploration vehicles was the motivation of this work. The advantages of such structures are their light weight and the capability to withstand large displacements without exceeding their specified elastic limit. The control of vibrations of its free end is essential for a practical application. In this context, the objective of this study is to determine a dynamic model for a long and flexible structure, aiming its vibration control. The structure has a variable section, similar to a telescopic beam. Large deformation behavior of the structure is considered. Concentrated loads, self-weight of the structure and tendon traction are the loads applied to the structure. The model dynamics is described by a low order finite element mesh, which is adapted to the geometry defined by the static deformation of the beam. The vibrations to be controlled are the small oscillations about the equilibrium position of the deformed beam. The dynamic model found for the structure is applied to design an active vibration controller. The controller forces are applied though the tendon traction cables, which is also responsible for the static deformation of the beam itself. Comparison with literature as well as experimental results prove the validity of the model used to characterize the system. Numerical simulations show the success of using the model in the design of an active vibration controller
Doutorado
Mecanica dos Sólidos e Projeto Mecanico
Doutor em Engenharia Mecânica
Dragoun, Jan. "Dvouválcový čtyřdobý plochý zážehový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230626.
Повний текст джерелаSteigl, Vladimír. "Čtyřválcový zážehový motor s vypínáním válců." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318839.
Повний текст джерелаBertrandias, Aude. "Understanding drop generation mechanisms in transversally vibrating membrane emulsification." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC094/document.
Повний текст джерелаIn transversally vibrating membrane emulsification, significantly smaller drops are generated in certain conditions. We aim to explain the mechanisms involved. To do so, two experimental setups were developed. A single drop is formed from a nozzle into an outer phase, which is either stationary or cross-flowing. The nozzle can be submitted to axial vibrations.For a drop formed into a stationary phase, a transition in drop generation occurs above a critical forcing amplitude. Below the threshold, a large drop forms by dripping. Above the threshold, a drop detaches when its first eigenfrequency and the forcing frequency coincide. The drop then resonates and detaches once a critical elongation ratio is reached. We model a drop as a linearly forced harmonic oscillator and add an extra damping term to account for the viscous dissipation between the drop and nozzle surface. We well reproduce the threshold amplitudes and drop diameters.We also study drops generated into cross-flow. In dripping mode, drop diameters are described by a torque balance. At a critical inner Weber number function of the outer capillary and Ohnesorge numbers, a transition to jetting occurs. Jet widening or narrowing takes place depending on the phase velocity ratio. We propose a model to account for the transition to jetting based on the drop equation of motion. Overall, we adequately account for the jetting velocity and drop diameters, with discrepancies which were explained
Ehrenberger, Pavel. "Modální vlastnosti klikového ústrojí čtyřválcového traktorového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228988.
Повний текст джерелаKučera, Ondřej. "Čtyřválcový řadový zážehový letecký motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444959.
Повний текст джерелаSüttő, Daniel. "Pětiválcový řadový vznětový motor s excentrickým klikovým mechanismem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231456.
Повний текст джерелаTing-Kong, Christopher. "Design of an adaptive dynamic vibration absorber." Title page, contents and abstract only, 1998. http://thesis.library.adelaide.edu.au/adt-SUA/public/adt-SUA20010220.212153.
Повний текст джерелаPulava, Oleksandr. "Šestiválcový vznětový motor pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378397.
Повний текст джерелаMonteil, 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.
Повний текст джерелаLeon, Armando. "Non-Linear Vibration and Dynamic Fracture Mechanics of Bridge Cables." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00488.
Повний текст джерелаLic March 2011
Freisleben, Pavel. "Dvouválcový zážehový motor s excentrickým klikovým mechanismem pro osobní vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232115.
Повний текст джерелаNolte, Rainer. "Formatabhängige hochdynamische Bewegungen mit Servoantrieben." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-226132.
Повний текст джерелаJames, Ashley Jean. "Vibration induced droplet ejection." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17337.
Повний текст джерелаMunera, Ramirez Marcela. "Analyse vibro-biomécanique et dynamique en sport/santé. Cas du cyclisme." Thesis, Reims, 2014. http://www.theses.fr/2014REIMS016/document.
Повний текст джерелаVibration phenomenon presents two faces in the sports world. Got under control ; it can be useful in body and muscle building and muscle re-education ; otherwise this phenomenon leads deleterious consequences for the human body. These deleterious effects depend on the vibration nature but also of its propagation background : structural or human. Usually, the vibration suffered by the human body cannot be decoupled either the motion analysis or the analysis of muscular fatigue. This topic research is based in three notions : vibration, motionand the physiologie. The aim of this work will be to define the characteristics of performance and health through the study of the dynamical and physiological response of the human body
Ehnes, Charles W. "Damping in stiffener welded structures." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FEhnes.pdf.
Повний текст джерелаGraves, Kynan E., and kgraves@swin edu au. "Electromagnetic energy regenerative vibration damping." Swinburne University of Technology, 2000. http://adt.lib.swin.edu.au./public/adt-VSWT20060307.120939.
Повний текст джерелаAssi, Gustavo R. S. "Mechanisms for flow-induced vibration of interfering bluff bodies." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508992.
Повний текст джерелаJane, Kuo Chang. "Buckling, postbuckling deformation and vibration of a delaminated plate." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19975.
Повний текст джерелаHoward, Carl. "Active isolation of machinery vibration from flexible structures." Title page, abstract and table of contents only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phh8478.pdf.
Повний текст джерелаCopy 2 does not have a CD-ROM. Includes bibliographical references (p. 317-330). Also available in an electronic version.
Zhou, Li. "Vibration control of buildings using smart magnetorheological dampers /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202002%20ZHOU.
Повний текст джерелаIncludes bibliographical references (leaves 163-177). Also available in electronic version. Access restricted to campus users.
Baldassarri, Mirko. "Review of Vibration Energy Harvester." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Знайти повний текст джерелаHoldhusen, Mark Horner. "Experimental validation and the effect of damping on the state-switched absorber used for vibration control." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16688.
Повний текст джерелаHuang, Yao-Hsin. "Some fundamental issues of constrained layer damping treatments /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7046.
Повний текст джерелаYellin, Jessica M. "An analytical and experimental analysis for a one-dimensional passive stand-off layer damping treatment /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7030.
Повний текст джерелаNeukirch, Sebastien. "Enroulement, contact et vibrations de tiges élastiques." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00667562.
Повний текст джерелаDesplanche, Sarah. "De l'étude fondamentale d’hydrates d’acide fort par spectroscopie de vibration et de relaxation à l'application de leur super-conductivité protonique pour le développement d'une micropile à combustible." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0171/document.
Повний текст джерелаFuel cells (FC) using hydrogen possess very good energy performance and produce no greenhouse gases. It presents itself today as a clean and efficient solution. This alternative could then become a possible substitute for fossil fuels and palliate for the intermittency ofcertain renewable energies.There are various types of FC, mainly distinguished by the nature of the electrolyte that composes their proton exchange membrane. Using strong acid clathrate hydrates as solid electrolyte represents an alternative for which very little is known nowadays. These systems are nanoporous crystalline solids consisting of a water host network forming nanometric cavities encapsulating guest molecules. In the case of strong acid clathrate hydrates, the confinement of acidic species within the aqueous cages generates proton excess that isdelocalized along their aqueous network. At room temperature, these clathrate hydrates have then excellent proton conductivity, which is higher than that of the FCs membranes currently used. The objective of this PhD was to develop an electrolyte based on hexafluorophosphoricacid clathrate hydrate (one of the best-known conductors of this class of system) on the basisof a fundamental physico-chemical approach, and to develop a miniaturized FC assemblyincorporating this new electrolyte.At a fundamental level, it was necessary to understand the driving factors responsible for the super-protonic conductivity of these systems and in particular, the relationship between the conductivity and the hydration number (i.e. water to acid molar ratio in the clathrate). The microscopic mechanisms have been studied by means of Raman spectroscopy and imaging, supplemented by nuclear magnetic resonance, X-ray diffraction and electrochemical impedance spectroscopy experiments. A set of results concerning the structure (clathrate type, phase transition and thermodynamic stability), the dynamics (vibrational modes, proton diffusion and kinetics) and the chemistry (inclusion of fluorinated impurities) has thus been obtained. As a selective and microscopic probe, the Raman scattering technique provided unique information. It allowed to probe the acid-cages interactions, to propose an experimental protocol monitoring the hydration number and also,to reveal, for the first time, a microstructuration of the clathrate hydrate only observed abovea hydration threshold. These physico-chemical properties have been correlated with the conductivity measurements, making it possible to understand the impact of the hydration number and of the chemical impurities onto the electrochemical performances of the solid electrolyte. All these results led to an original technological development. A new micro-fuel cell using hexafluorophosphoric acid hydrates as the electrolyte has been designed. This development offers a FC with performances comparable to the FCs currently available and operating from room temperature to negative temperatures
Blom, Peter. "Exploring the vibration control potential of magneto-sensitive rubber." Licentiate thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-241.
Повний текст джерела