Relevant bibliographies by topics / Damped oscillation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Damped oscillation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Damped oscillation"

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Murayama, Yoriko, Hiroshi Kori, Chiaki Oshima, Takao Kondo, Hideo Iwasaki, and Hiroshi Ito. "Low temperature nullifies the circadian clock in cyanobacteria through Hopf bifurcation." Proceedings of the National Academy of Sciences 114, no. 22 (May 17, 2017): 5641–46. http://dx.doi.org/10.1073/pnas.1620378114.

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Cold temperatures lead to nullification of circadian rhythms in many organisms. Two typical scenarios explain the disappearance of rhythmicity: the first is oscillation death, which is the transition from self-sustained oscillation to damped oscillation that occurs at a critical temperature. The second scenario is oscillation arrest, in which oscillation terminates at a certain phase. In the field of nonlinear dynamics, these mechanisms are called the Hopf bifurcation and the saddle-node on an invariant circle bifurcation, respectively. Although these mechanisms lead to distinct dynamical properties near the critical temperature, it is unclear to which scenario the circadian clock belongs. Here we reduced the temperature to dampen the reconstituted circadian rhythm of phosphorylation of the recombinant cyanobacterial clock protein KaiC. The data led us to conclude that Hopf bifurcation occurred at ∼19 °C. Below this critical temperature, the self-sustained rhythms of KaiC phosphorylation transformed to damped oscillations, which are predicted by the Hopf bifurcation theory. Moreover, we detected resonant oscillations below the critical temperature when temperature was periodically varied, which was reproduced by numerical simulations. Our findings suggest that the transition to a damped oscillation through Hopf bifurcation contributes to maintaining the circadian rhythm of cyanobacteria through resonance at cold temperatures.
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Naber, Mark. "Linear Fractionally Damped Oscillator." International Journal of Differential Equations 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/197020.

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The linearly damped oscillator equation is considered with the damping term generalized to a Caputo fractional derivative. The order of the derivative being considered is . At the lower end the equation represents an undamped oscillator and at the upper end the ordinary linearly damped oscillator equation is recovered. A solution is found analytically, and a comparison with the ordinary linearly damped oscillator is made. It is found that there are nine distinct cases as opposed to the usual three for the ordinary equation (damped, over-damped, and critically damped). For three of these cases it is shown that the frequency of oscillation actually increases with increasing damping order before eventually falling to the limiting value given by the ordinary damped oscillator equation. For the other six cases the behavior is as expected, the frequency of oscillation decreases with increasing order of the derivative (damping term).
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Yasui, T., M. Ohashi, N. Matsumoto, and S. Komune. "Analysis of the passive damped oscillation of the guinea pig stapes." Journal of Laryngology & Otology 129, S2 (February 23, 2015): S2—S5. http://dx.doi.org/10.1017/s0022215114002308.

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AbstractObjective:To investigate the characteristic physical properties of the oscillating system in the intact middle ear using a high-speed camera.Design:We analysed the oscillation of the guinea pig stapes using a high-speed camera. The specimens were prepared so that the middle-ear structures were intact. Tones of various frequencies were delivered into the external auditory canal.Results:We found that the stapes showed a damped oscillation after the sound stimulation had stopped. The damped oscillation after the sound stimulation showed a specimen-specific frequency that was independent of the frequency of the stimulating sound. An injury to the bony labyrinth, which removed most of the mass from the oscillating system, attenuated the damped oscillation. Therefore, this damped oscillation is likely a passive motion, rather than a reverberation of the stimulating sound.Conclusion:Analysing the passive damped oscillation may reveal the characteristic physical properties of the oscillating system in the near-intact middle ear. Further refinement of this simple and straightforward system may enhance basic and clinical research on the middle ear in a more intuitive way.
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Huang, Yan, and Song Lin He. "Study on the Free Vibration of Odd Power Oscillators." Applied Mechanics and Materials 226-228 (November 2012): 142–45. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.142.

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The cycle formula of undamped free vibration of odd power oscillators has been gotten by theoretical analysis. The formula shows that the cycle is related to the initial conditions. The numerical experiments reveal that there are three states such as damped oscillation, critical damped oscillation and overdamped oscillation while an odd power oscillator moves in linear damping force. These situations are same as that of a linear oscillator. Unlike the linear oscillator, the critical damping constant of an odd power oscillator is related to the initial conditions. The quantitative expression of the critical damping constant changing with system parameters and initial conditions has been obtained. By analyzing of numerical experimental data, the exponential decay law of the amplitude of an odd power oscillator which moves in damped state has been discovered.
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Knizhnik, Kalman, Manuel Luna, Karin Muglach, Holly Gilbert, Therese Kucera, and Judith Karpen. "Observational Study of Large Amplitude Longitudinal Oscillations in a Solar Filament." Proceedings of the International Astronomical Union 8, S300 (June 2013): 428–29. http://dx.doi.org/10.1017/s174392131301140x.

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AbstractOn 20 August 2010 an energetic disturbance triggered damped large-amplitude longitudinal (LAL) oscillations in almost an entire filament. In the present work we analyze this periodic motion in the filament to characterize the damping and restoring mechanism of the oscillation. Our method involves placing slits along the axis of the filament at different angles with respect to the spine of the filament, finding the angle at which the oscillation is clearest, and fitting the resulting oscillation pattern to decaying sinusoidal and Bessel functions. These functions represent the equations of motion of a pendulum damped by mass accretion. With this method we determine the period and the decaying time of the oscillation. Our preliminary results support the theory presented by Luna and Karpen (2012) that the restoring force of LAL oscillations is solar gravity in the tubes where the threads oscillate, and the damping mechanism is the ongoing accumulation of mass onto the oscillating threads. Following an earlier paper, we have determined the magnitude and radius of curvature of the dipped magnetic flux tubes hosting a thread along the filament, as well as the mass accretion rate of the filament threads, via the fitted parameters.
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Sawkmie, Ivan Skhem, and Mangal C. Mahato. "Free Oscillations of a Damped Simple Pendulum: An Analog Simulation Experiment." Physics Educator 01, no. 04 (December 2019): 1950015. http://dx.doi.org/10.1142/s266133951950015x.

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The frequency of free oscillation of a damped simple pendulum with large amplitude depends on its amplitude unlike the amplitude-independent frequency of oscillation of a damped simple harmonic oscillator. This aspect is not adequately emphasized in the undergraduate courses due to experimental and theoretical difficulties. We propose an analog simulation experiment to study the free oscillations of a simple pendulum that could be performed in an undergraduate laboratory. The needed sinusoidal potential is obtained approximately by using the available AD534 IC by suitably augmenting the electronic circuitry. To keep the circuit simple enough we restrict the initial angular amplitude of the simple pendulum to a maximum of [Formula: see text]. The results compare well qualitatively with the theoretical results. The small quantitative discrepancy is attributed to the inexact nature of the used “sinusoidal potential”.
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Cherentsov, D. A., S. P. Pirogov, S. M. Dorofeev, and S. A. Cherentsova. "RESEARCH OF DAMPED OSCILLATIONS MANOMETRIC SPRING WITH HARD TIP." Oil and Gas Studies, no. 1 (March 1, 2017): 116–20. http://dx.doi.org/10.31660/0445-0108-2017-1-116-120.

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The main results of the calculations of damped oscillations ofmanometric tubular springs (MTS) considering the hard tip are presented. The calculations are based on previously developed mathematical model. An assessment of the impact of the MTS mass on damped oscillation parameters (frequency and oscillation damping parameter) was made, the change of the limit value of viscosity of the damping fluid at which the aperiodic motion begins, as well as the value of the tip mass at which the system ceases to oscillate.
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Thandapani, E. "Oscillation theorems for second order damped nonlinear difference equations." Czechoslovak Mathematical Journal 45, no. 2 (1995): 327–35. http://dx.doi.org/10.21136/cmj.1995.128516.

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Varshney, Vaibhav, Garima Saxena, Bibhu Biswal, and Awadhesh Prasad. "Oscillation death and revival by coupling with damped harmonic oscillator." Chaos: An Interdisciplinary Journal of Nonlinear Science 27, no. 9 (September 2017): 093104. http://dx.doi.org/10.1063/1.4990482.

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Xu, Zhiting. "On second order damped elliptic oscillation." Journal de Mathématiques Pures et Appliquées 89, no. 2 (February 2008): 134–44. http://dx.doi.org/10.1016/j.matpur.2007.10.005.

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Dissertations / Theses on the topic "Damped oscillation"

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Mihalík, Vlastimil. "Oscilační generátor s mechanickým resonančním členem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228777.

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This work deals with the power supply of wireless sensors. When using a wireless sensor is desirable application of alternative energy sources, because the primary cells or batteries may reduce the extent or length of service of the sensor itself. Ambient energy can be used as a suitable alternative source. This energy must be in an appropriate form, which allows its conversion to electric energy. These appropriate, already used types include: solar en., temperature gradient en., en. of flowing liquids, vibration, etc. The advantage of vibrations is its presence in almost all mechanical systems. One of the possibilities for using the vibration of machine systems for power supply wireless sensors is using the vibration power generator with oscillating component. The generator must be designed so that its resonance frequency coincides with the frequency of vibration in the machine system. This method can be used only if the machinery system vibrations at least partially constant. Another option is to use the vibrations caused by, for example, transit transport, or different step acting factor. In this case, it is desirable that the generator is designed with variable resonant frequency, which can partly be achieved, for example, integrating several oscillating component in the body of generator. After the general analysis of the problem, graduation theses will be concerned with the possibility of use of energy from the short damped oscillation and step impulse. Focusing on a proposal of multi-element structures.
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Welt, François. "A study of nutation dampers with application to wind induced oscillations." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29451.

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Energy dissipation due to sloshing liquid in torus shaped nutation dampers is studied using the potential flow model with nonlinear free surface conditions in conjunction with the boundary layer correction. Special consideration is given to the case of resonant interactions which were found to yield interesting damping characteristics. An extensive test program with the dampers undergoing steady-state oscillatory translation is then undertaken to establish the optimal damper parameters. Low liquid heights and large diameter ratios with the system operating at the liquid sloshing resonance are shown to result in increased damping, while low Reynolds numbers and presence of baffles tend to reduce the peak efficiency by restricting the action of the free surface. Tests with two-dimensional as well as three-dimensional models in laminar flow and boundary layer wind tunnels suggest that the dampers can successfully control both the vortex resonance and galloping types of instabilities. Applicability of the concept to vertically oscillating structures such as transmission lines is also demonstrated with dampers undergoing a rotational motion about their horizontal axis.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Han, Yong. "Aeroelastic oscillations of damaged wing structures with bonded piezoelectric strips." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116892.

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This thesis examines a new method of detecting the presence of structural cracks in wing-like structures at an incipient stage. This method is based on the analysis of the dynamics of damaged structures with bonded piezoelectric strips executing flexural oscillations. Such oscillations can be generated by mechanical loads, piezoelectric actuators, or unsteady aerodynamic loads in certain flight conditions of the aircraft. The proposed method of crack detection uses pairs of piezoelectric strip sensors bonded on the opposite sides of the structure and is based on the fact that the presence of a crack causes a difference between the strains measured by the two sensors of a given pair. The structural analysis presented in this thesis uses a nonlinear model for the cracks and a finite element formulation for the piezoelectric strips coupled with the structure. A 3D panel method is used to determine the unsteady aerodynamic loads acting on the oscillating wing. This study includes the dynamic analysis in time domain of cracked wing-like structures undergoing forced flexural vibrations in a range of frequencies generated by a pair of piezoelectric actuators, as well as the analysis of the oscillating wings with piezoelectric strips subjected to unsteady aerodynamic loads. The numerical simulations have shown that the presence of a crack in wing-like structures can be efficiently detected at an early stage by monitoring the response of the piezoelectric sensor pairs.
Cette thèse étudie une nouvelle méthode de détection de la présence de fissures structurelles à un stade précoce dans une structure de type aile. Cette méthode est basée sur l'analyse des oscillations en flexion des structures endommagées munies de bandes piézoélectriques collées. Ces oscillations peuvent être générées par des charges mécaniques, des actionneurs piézoélectriques, ou des charges aérodynamiques instationnaires dans certaines conditions de vol de l'avion. La méthode de détection des fissures proposée utilise des paires de capteurs piézoélectriques collés sur les côtés opposés de la structure et est basée sur le fait que la présence d'une fissure entraîne une différence entre les déformations mesurées par les deux capteurs d'une paire donnée. L'analyse structurale présentée dans cette thèse utilise un modèle non linéaire pour les fissures et une formulation par éléments finis pour les bandes piézoélectriques couplées avec la structure. Une méthode de panneau tridimensionnelle est utilisée pour déterminer les charges aérodynamiques instationnaires agissant sur l'aile oscillante. Cette étude comprend l'analyse dynamique dans le domaine temporel de structure de type aile fissurée subissant des vibrations en flexion forcées dans une gamme de fréquences générées par une paire d'actionneurs piézoélectriques, ainsi que l'analyse des ailes oscillantes équipées de bandes piézoélectriques soumises à des charges aérodynamiques instationnaires. Les simulations numériques ont montré que la présence d'une fissure dans ces structures peut être efficacement détectée à un stade précoce en surveillant la réponse des capteurs piézoélectriques.
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Majzoub, Razan Ahmad. "The role of damper windings in suppressing electromechanical oscillations of diesel-driven synchronous generators." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621355.

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Al, Hamidi Yasser. "Multivariable feedforward control of vibrations in multi-axes flexible structures : applications to multi-axes piezoelectric actuators." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD016/document.

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Les actionneurs multi-axes sont de plus en plus prisés par les concepteurs de systèmes de nanopositionnement car ils permettent une réduction de l'espace occupé et de l'énergie consommée, une dextérité plus grande et une modularité avec peu de contraintes pour les applications. Certains de ces actionneurs et systèmes multi-axes sont cependant caractérisés par des oscillations mal-amorties qui compromettent de manière drastique leurs performances générales. Cette thèse concerne l'exploitation des techniques de commande en boucle-ouverte input-shaping classiquement utilisées pour amortir de manière sans capteurs les oscillations dans les systèmes mono-axes et les étendent pour qu'ils soient utilisables pour les systèmes multi-axes. Les résultats proposés dans la thèse qui sont des techniques input-shaping multivariables sont ensuite appliquées sur des actionneurs piézoélectriques classiquement dédiés pour les applications de nanopositionnement
Multi-axes actuators are becoming more and more tempting to nanopositioning system designers as they enable them to save space, reduce energy consumption, increase dexterity and offer more modularity and freedom with fewer constraints to their applications. Some of these multi-axes actuators and systems exhibit however badly damped vibrations which strongly compromise their global performances. This thesis work exploits the advantages of the well-known feedforward input shaping techniques usually used to damp vibrations in monovariable (SISO) systems to present a new multivariable (MIMO) input shaping technique that can be used to damp vibrations in multi-axes systems. The approach that was used in this study is to extend a previous work that was done on multiple-input single-output (MISO) systems and generalize it for MIMO systems. The study demonstrates also the application of this newly developed technique on different piezoelectric actuators commonly used in nanopositioning systems
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Domínguez, García José Luis. "Analysis of the contribution of wind power plants to damp power system oscillations." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129687.

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Wind power has emerged as one of the most promising renewable energy sources. The very penetration levels of wind energy in power systems have altered several aspects of power system operation, such as system stability. Owing to the large penetration of wind power, transmission system operators (TSOs) have established special grid codes for wind farms connection. These grid codes require wind farms to provide ancillary services to the grid such as frequency and voltage regulation. In the near future, the capability of damping power system oscillations will be required. As a result of the development of such requirements, the concept of wind power plant (WPP) arises being de ned as a wind farm which is expected to behave similarly to a conventional power plant in terms of power generation, control and ancillary services. As future grid codes will require power oscillation damping contribution from wind power, the thesis is mainly focused on the analysis of the power system stabilizer (PSS) capability of wind power plants. The change produced by wind power plants based on di erent wind turbine technologies on power system small signal dynamics is analysed to determine their possible contribution to damp oscillations. The eff ect of the distance from the tie line to the wind power plant on the controller response and the influence of wind power plants proximity to synchronous generators are demonstrated to be critical factors. At this point several questions are raised as: What are the most critical factors? How can be ensure a proper contribution, at least the best possible response? Can it be ensured to be independent to the power system and the controller selected? To answer these questions, this thesis conducts research on proper selection of input-output signal pairs to damp out electromechanical oscillations using wind power plants without drawing attention to a particular control design. This is necessary conclusions about the power system independently of a particular controller. The capability to damp is an intrinsic characteristic of the system and should not be a ected by a particular controller (PSS). Firstly, di erent analysis techniques are compared, considering both controllability and observability measures and input-output interactions. This enables recommendations to be drawn so as to the selection of the the best signal pairs to damp power system oscillations considering di erent approaches, such as single-input single-output (SISO) and multivariable control (MIMO). Second, a new criterion to select the best input-output signals used by a PSS based on WPPs is presented, considering explicitly local and remote signals in the analysis. Taking into account fundamental design limitations and using controllability and observability concepts, the criterion is able to identify the most suitable pair of input-output local signals without consider any particular controller. Finally, due to the increase of wind power generation - including o shore locations - and the concept of an interconnected Pan-European network, a new o shore wind power plant AC network similar in design to the European SuperGrid \SuperNode", is analyzed. The cost e ect of choosing a nonstandard operating frequency on the o shore AC network is investigated. As the o shore AC network is isolated from onshore networks through the use of HVDC links, it may be operated in an asynchronous fashion and at a suitable frequency. The cost associated with operating the network at a fixed frequency in the range 20 to 120 Hz is investigated, focusing on the frequency-cost-scalings of electrical devices (such as cables, transformers and reactive compensation) and the related o shore infrastructures,
L'energia e olica s'ha convertit en una de les fonts d'energia renovable m es prometedores. Actualment, l'elevat nivell de penetraci o de l'energia e olica a la xarxa el ectrica ha conduï t a la modi caci o del comportament de diversos aspectes d'aquesta, com per exemple, l'estabilitat. Degut a aquesta gran penetraci o, els operadors de xarxes de transmissi o (TSOs) han establert procediments d'operaci o especials per a la connexi o de grans parcs e olics. Aquests codis requereixen als parcs elics que realitzin serveis auxiliars al sistema el ectric com, per exemple, la regulaci o de freqü encia i la regulaci o de la pot encia reactiva. En un futur proper, la capacitat dels parcs e olics per esmorteir les oscil lacions del sistema de pot encia es requerir a (en l'actualitat ja existeixen esborranys de nous procediments d'operaci o que ho inclouen). A causa d'aquest requeriments, el concepte de central de generaci o d'energia e olica es de neix com un parc e olic que s'espera que es comporti de manera similar a una central de generaci o el ectrica convencional en termes de poder realitzar tasques tals com generaci o, control i serveis auxiliars. Ja que un futur requeriment dels operadors de xarxa ser a la contribuci o de l'energia e olica en l'esmorteiment de les oscil lacions de pot encia, en aquesta tesi s'estudia la capacitat de les centrals e oliques per actuar com estabilitzador dels sistemes el ectrics de pot encia. A m es a m es, s'analitza l'efecte de les centrals d'energia e olica al comportament din amic del sistema el ectric considerant l'estabilitat de petita senyal, per a determinar quina podr a ser la possible contribuci o proporcionada per aquestes tecnologies. S'ha estudiat que l'efecte de la dist ancia des d'el punt de connexi o amb la central d'energia e olica a la resposta del control estabilitzant i la influ encia de la proximitat de les centrals e oliques als generadors s ncrons s on factors cr tics. D'aquest fet surgeixen algunes preguntes com: Es aquest el factor m es cr tic? Com es pot assegurar una contribuci o adequada, si m es no la millor resposta possible, per ajudar a estabilitzar el sistema el ectric? Es poden asegurar quina ser a la contribuci o a l'estabilitat del sistema el ectric independentment de la xarxa i l'esquema de control escollit? Per respondre a aquestes preguntes, aquesta tesi ha realitzat investigacions sobre l'adequada selecci o de parells de senyals d'entrada-sortida per esmorteir les oscil lacions electromec aniques amb centrals e oliques evitant dissenyar el controlador i propossant met odes f acilment adaptables a qualsevol sistema el ectric. En primer lloc, s'han comparat diferents t ecniques d'an alisi tenint en compte tant les mesures de controlabilitat i observabilitat com les interaccions entre les senyals d'entrada i sortida. D'aquesta comparaci o, certes recomanacions es donen a l'hora de seleccionar els millors parells de senyals per esmorteir les oscil lacions del sistema el ectric de pot encia considerant diferents esquemes de control com ara entrada unica sortida unica (SISO) i control multivariable (MIMO). En segon lloc, s'ha proposat un nou criteri per seleccionar les senyals d'entrada i sortida utilitzades per un control estabilitzador per centrals d'energia e olica. On, a difer encia amb anteriors met odes de selecci o proposats, el criteri presentat considera expl citament tant senyals locals com senyals remotes dins el seu an alisi. Aquest criteri es capa c d'identi car la parella de senyals locals d'entrada i sortida m es adequada sense realitzar el disseny del controlador, considerant tant les limitacions fonamentals del disseny del controlador imposades per el sistema com els conceptes de controlabilitat i observabilitat. Finalment, a causa del augment de la generaci o d'energia e olica, principalment en localitzacions marines, i al concepte d'una xarxa el ectrica comuna Pan-Europea, s'ha realitzat l'an alisi d'un nou concepte de xarxa en corrent altern (AC) dins de les centrals d'energia e olica marina, amb un disseny similar al concepte investigat a la Super-Xarxa Europea \Supernode". En aquest treball s'ha investigat l'efecte que t e en els costos la tria una freqüencia nominal d'operaci o no est andard en dita xarxa en corrent altern. La xarxa en AC que es forma entre les turbines e oliques i el convertidor de transmissi o es aï llada tant de les xarxes terrestres per l' us d'enlla cos en corrent continu (HVDC) com de la pr opia de les turbines per el convertidor que porten incorporat. Aquest fet implica que aquesta xarxa pot ser operada sense sincronitzar a qualsevol freqüencia. En aquesta tesi, s'ha estudiat quin es el cost associat amb l'operaci o de la xarxa a una freqü encia fi xa dins del rang de 20-120 Hz, focalitzant principalment en l'escalat del costos dels diferents elements el ectrics (com ara cables, transformadors i compensaci o reatviva i infraestructures necessaris en instal lacions marines respecte la freqüencia.
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Elshafei, Hesham. "Neurophysiological Mechanisms of Auditory Distractibility in the Healthy, Aging or Damaged Human Brain." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1255/document.

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Les mécanismes volontaires (V) et involontaires (I) de l’attention reposent sur les réseaux dorsal et ventral, convergeant dans le cortex préfrontal latéral (lPFC). La distractibilité accrue liée au vieillissement ou à une lésion frontale pourrait être due à une altération de l’équilibre entre ces mécanismes V et I, essentiel mais rarement étudié. Notre objectif est de tester, dans la modalité auditive, si (1) les oscillations alpha coordonnent l'activité du réseau dorsal, (2) les oscillations gamma celle du réseau ventral, (3) le couplage oscillatoire dans le lPFC maintient l’équilibre entre les deux réseaux. Ce travail vise également à étudier les corrélats oscillatoires de la distractibilité accrue liée au vieillissement ou à une atteinte frontale. Des données MEEG ont été enregistrées alors que des participants réalisaient le Competitive Attention Test, qui permet d’étudier simultanément les mécanismes V et I de l’attention. Nous avons montré que les oscillations alpha reflètent l’activation des mécanismes facilitateurs et suppresseurs de l’attention V, et la communication au sein du réseau dorsal ; alors que les oscillations gamma indexent l’activation du réseau ventral. De plus, le lPFC serait impliqué dans la communication au sein des deux réseaux, et le PFC médian dans l’équilibre attentionnel V/I. Nous avons également montré que la distractibilité accrue était liée à un déficit d’attention V au cours du vieillissement, et à une altération des processus V et I après lésion frontale. Ce travail de thèse offre donc une meilleure compréhension de la dynamique cérébrale oscillatoire sur laquelle repose l'équilibre attentionnel V/I, et donc la distractibilité
Top-down (TD) and bottom-up (BU) mechanisms of attention are supported by dorsal and ventral networks that mainly overlap in the lateral prefrontal cortex (lPFC). A balance between these mechanisms is essential, yet rarely investigated. Increased distractibility observed during ageing or after frontal damage could result from jeopardizing this balance. It has been proposed that distinct oscillatory frequencies support the activation of these two attention networks. Our main aim was to test, in the auditory modality, whether (1) alpha oscillations would coordinate activity within the dorsal TD network, (2) gamma activity would index the activation of the ventral BU network, (3) the lPFC would support the balance between these networks through oscillatory coupling. We also aimed to investigate the oscillatory correlates of the increased distractibility associated with ageing or frontal damage. MEEG data were recorded while participants performed the Competitive Attention Test, which enables simultaneous investigation of BU and TD attention mechanisms. We showed that alpha oscillations indexed facilitatory and suppressive mechanisms of TD attention, and communication within the dorsal network; while gamma oscillations indexed the ventral network activation. Moreover, the lPFC subtended communication in the two networks; with the TD/BU interaction occurring in the medial PFC. We also showed that ageing-related distractibility was of TD deficit origin. Finally, preliminary results suggest that lPFC damage can impact both TD and BU attention. This thesis provides novel insights into the brain oscillatory dynamics of the TD/BU attentional balance supporting distractibility
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Hrazdíra, Zdeněk. "Vzájemná interakce tlakových pulsací a kmitání nepřímé trubice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382190.

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This thesis deals with mathematical modeling of multiphysics FSI (fluid-structure interaction) problem, describing mutual interaction of pressure pulsations and vibrations of indirect pipe in a 2D region. Firstly, physical partial differential equations are derived separately for both media, which are in turn coupled and solved analytically. Results of mentioned models include natural frequency values, amplitude-frequency characteristics and both natural and driven damped oscillations of pipe and liquid.
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Aslan, Halit Sevki [Verfasser], Michael [Gutachter] Reissig, Michael [Akademischer Betreuer] Reissig, Fumihiko [Gutachter] Hirosawa, Rainer [Gutachter] Picard, Swanhild [Gutachter] Bernstein, Udo [Gutachter] Hebisch, and Hans-Jörg [Gutachter] Starkloff. "The influence of strong time-dependent oscillations on semilinear damped wave models / Halit Sevki Aslan ; Gutachter: Michael Reissig, Fumihiko Hirosawa, Rainer Picard, Swanhild Bernstein, Udo Hebisch, Hans-Jörg Starkloff ; Betreuer: Michael Reissig." Freiberg : Technische Universität Bergakademie Freiberg, 2020. http://d-nb.info/1220779326/34.

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Novikov, Alexey. "Path integral formulation of dissipative quantum dynamics." Doctoral thesis, [S.l. : s.n.], 2005. http://archiv.tu-chemnitz.de/pub/2005/0050.

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Books on the topic "Damped oscillation"

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Veselić, Krešimir. Damped Oscillations of Linear Systems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21335-9.

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service), SpringerLink (Online, ed. Damped Oscillations of Linear Systems: A Mathematical Introduction. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Tripp, John S. High-precision buffer circuit for suppression of regenerative oscillation. Hampton, Va: Langley Research Center, 1995.

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Damped Harmonic Oscillator [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.78154.

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High-precision buffer circuit for suppression of regenerative oscillation. [Hampston, Va.]: NASA, Langley Research Center, 1995.

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A, Hare David, Tcheng Ping, and Langley Research Center, eds. High-precision buffer circuit for suppression of regenerative oscillation. [Hampston, Va.]: NASA, Langley Research Center, 1995.

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High-precision buffer circuit for suppression of regenerative oscillation. [Hampston, Va.]: NASA, Langley Research Center, 1995.

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A, Hare David, Tcheng Ping, and Langley Research Center, eds. High-precision buffer circuit for suppression of regenerative oscillation. [Hampston, Va.]: NASA, Langley Research Center, 1995.

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Boudreau, Joseph F., and Eric S. Swanson. Nonlinear dynamics and chaos. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198708636.003.0013.

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Simple maps and dynamical systems are used to explore chaos in nature. The discussion starts with a review of the properties of nonlinear ordinary differential equations, including the useful concepts of phase portraits, fixed points, and limit cycles. These notions are developed further in an examination of iterative maps that reveal chaotic behavior. Next, the damped driven oscillator is used to illustrate the Lyapunov exponent that can be used to quantify chaos. The famous KAM theorem on the conditions under which chaotic behavior occurs in physical systems is also presented. The principle is illustrated with the Hénon-Heiles model of a star in a galactic environment and billiard models that describe the motion of balls in closed two-dimensional regions.
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Book chapters on the topic "Damped oscillation"

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Ito, Hiroshi, Yoriko Murayama, Naohiro Kawamoto, Motohide Seki, and Hideo Iwasaki. "Damped Oscillation in the Cyanobacterial Clock System." In Circadian Rhythms in Bacteria and Microbiomes, 221–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72158-9_12.

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Kovacic, Ivana. "Free Damped Oscillators." In Nonlinear Oscillations, 77–132. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53172-0_3.

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Vistnes, Arnt Inge. "Free and Damped Oscillations." In Physics of Oscillations and Waves, 7–30. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72314-3_2.

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Garrett, Steven L. "The Simple Harmonic Oscillator." In Understanding Acoustics, 59–131. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_2.

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Abstract This chapter will introduce a system that is fundamental to our understanding of more physical phenomena than any other. Although the “simple” harmonic oscillator seems to be only the combination of the most mundane components, the formalism developed to explain the behavior of a mass, spring, and damper is used to describe systems that range in size from atoms to oceans. Our investigation goes beyond the “traditional” treatments found in the elementary physics textbooks. For example, the introduction of damping will open a two-way street: a damping element (i.e., a mechanical resistance, Rm) will dissipate the oscillator’s energy, reducing the amplitudes of successive oscillations, but it will also connect the oscillator to the surrounding environment that will return thermal energy to the oscillator. The excitation of a harmonic oscillator by an externally applied force, displacement, or combination of the two will result in a response that is critically dependent upon the relationship between the frequency of excitation and the natural frequency of the oscillator and will introduce the critical concepts of mechanical impedance, resonance, and quality factor. Finally, the harmonic oscillator model will be extended to coupled oscillators that are represented by combinations of several masses and several springs.
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Stapountzis, Herricos, Ioanna Lichouna, Violetta Koumoukeli, and Margarita Stapountzi. "Damped Oscillations of Spherical Pendulums." In Fluid-Structure-Sound Interactions and Control, 261–65. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4960-5_41.

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Khaled, Nassim. "Mass-Spring-Damper Oscillations." In Virtual Reality and Animation for MATLAB® and Simulink® Users, 21–34. London: Springer London, 2011. http://dx.doi.org/10.1007/978-1-4471-2330-9_4.

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Campos, L. M. B. C. "The Damped/Amplified and Forced Oscillator." In Linear Differential Equations and Oscillators, 171–270. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429028984-2.

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Semercigil, S. Eren, Özden F. Turan, and Gregory A. Kopp. "A Particle Damper for Transient Oscillations." In Conference Proceedings of the Society for Experimental Mechanics Series, 153–60. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9299-4_12.

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Graham, Robert. "Subharmonic Generation and Squeezing in a Damped Oscillator." In Squeezed and Nonclassical Light, 217–33. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-6574-8_17.

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Burq, Nicolas. "Second Microlocalization and Stabilization of Damped Wave Equations on Tori." In Shocks, Singularities and Oscillations in Nonlinear Optics and Fluid Mechanics, 55–73. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52042-1_3.

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Conference papers on the topic "Damped oscillation"

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Karsai, János, and John Graef. "On the oscillation of impulsively damped halflinear oscillators." In The 6'th Colloquium on the Qualitative Theory of Differential Equations. Szeged: Bolyai Institute, SZTE, 1999. http://dx.doi.org/10.14232/ejqtde.1999.5.14.

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Selvam, A. George Maria, and R. Janagaraj. "Oscillation theorems for damped fractional order difference equations." In SECOND INTERNATIONAL CONFERENCE OF MATHEMATICS (SICME2019). Author(s), 2019. http://dx.doi.org/10.1063/1.5097518.

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Yao, FENG, WANG Hong, QU Zhiguo, and LI Fan. "Attitude correction of stratospheric airship based on damped oscillation model." In 2019 3rd International Conference on Electronic Information Technology and Computer Engineering (EITCE). IEEE, 2019. http://dx.doi.org/10.1109/eitce47263.2019.9094778.

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Xiaojing Wang and Guohua Song. "Oscillation criteria for a second-order nonlinear damped differential equation." In 3rd International Conference on Contemporary Problems in Architecture and Construction. IET, 2011. http://dx.doi.org/10.1049/cp.2011.1300.

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Islam, Mobarakol, MD Tofael Hossain Khan, Arifur Rahaman, Sudip Kumar Saha, Anindya Kumar Kundu, and Md Masud Rana. "Training neural network with damped oscillation and maximized gradient function." In 2011 14th International Conference on Computer and Information Technology (ICCIT). IEEE, 2011. http://dx.doi.org/10.1109/iccitechn.2011.6164846.

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Saha, Sudip Kumar, Ibnul Sanjid Iqbal, and Md Osman Goni. "Self Consistent Field method with damped oscillation for nano device." In 2013 International Conference on Electrical Information and Communication Technology (EICT). IEEE, 2014. http://dx.doi.org/10.1109/eict.2014.6777866.

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Alhazza, Khaled A., Asmahan H. Al-Shehaima, and Ziyad N. Masoud. "A Continuous Modulated Wave-Form Command Shaping for Damped Overhead Cranes." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48336.

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A new command-shaping control strategy for oscillation reduction of damped harmonic oscillators is derived and implemented on damped overhead cranes. The effect of damping on the shaper frequency and duration is investigated. The performance of the proposed simper is simulated numerically and compared with the classical double-step input-shaper for different system properties. It was shown that, the proposed wave-form command profiles are capable of eliminating the travel and residual oscillations for systems with different damping ratio. Further, unlike traditional impulse and step command shapers, the proposed command profiles have smoother intermediate acceleration, velocity, and displacement profile.
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Chen, Shi, Dongqi Zhang, Shengqiang Shen, Xiaohua Liu, and Yaqiong Chen. "Spherical drop impact on solid surfaces: Un-damped oscillation theoretical model." In INTERNATIONAL CONFERENCE ON THERMAL SCIENCE AND TECHNOLOGY (ICTST) 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5046616.

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Zhao, D., S. Andreou, W. Yao, K. Williams, and X. Leijtens. "Monolithically Integrated Multi-Wavelength DBR Laser with Damped Relaxation Oscillation Dynamics." In 2018 European Conference on Optical Communication (ECOC). IEEE, 2018. http://dx.doi.org/10.1109/ecoc.2018.8535351.

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Tsai, Hsin-Ruey, Ching-Wen Hung, Tzu-Chun Wu, and Bing-Yu Chen. "ElastOscillation: 3D Multilevel Force Feedback for Damped Oscillation on VR Controllers." In CHI '20: CHI Conference on Human Factors in Computing Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3313831.3376408.

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Reports on the topic "Damped oscillation"

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Mickens, Ronald, and Kale Oyedeji. Dominant Balance Analysis of the Fractional Power Damped Harmonic Oscillator. Atlanta University Center Robert W. Woodruff Library, 2019. http://dx.doi.org/10.22595/cau.ir:2020_mickens_oyedeji_harmonic_oscillator.

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Stoltz, P. H., and J. R. Cary. General linear theory of damped, beam-driven oscillations of a single wave. Office of Scientific and Technical Information (OSTI), June 1998. http://dx.doi.org/10.2172/621890.

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Oh, H. G., H. R. Lee, Thomas F. George, and C. I. Um. Exact Wave Functions and Coherent States of a Damped Driven Harmonic Oscillator. Fort Belvoir, VA: Defense Technical Information Center, February 1989. http://dx.doi.org/10.21236/ada205785.

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Xu, J., J. Claus, and A. G. Ruggiero. A Feedback Device to Damp the Coherent Oscillations from Injection Errors in RHIC. Office of Scientific and Technical Information (OSTI), July 1990. http://dx.doi.org/10.2172/1119328.

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