Готові списки джерел за темами / Oscillating Mechanism

Добірка наукової літератури з теми "Oscillating Mechanism"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Oscillating Mechanism"

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Pavalavanni, Pradeep Kumar, Min-Seon Jo, Jae-Eun Kim, and Jeong-Yeol Choi. "Numerical Study of Unstable Shock-Induced Combustion with Different Chemical Kinetics and Investigation of the Instability Using Modal Decomposition Technique." Aerospace 10, no. 3 (March 15, 2023): 292. http://dx.doi.org/10.3390/aerospace10030292.

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An unstable shock-induced combustion (SIC) case around a hemispherical projectile has been numerically studied which experimentally produced a regular oscillation. Comparison of detailed H2/O2 reaction mechanisms is made for the numerical simulation of SIC with higher-order numerical schemes intended for the use of the code for the hypersonic propulsion and supersonic combustion applications. The simulations show that specific reaction mechanisms are grid-sensitive and produce spurious reactions in the high-temperature region, which trigger artificial instability in the oscillating flow field. The simulations also show that specific reaction mechanisms develop such spurious oscillations only at very fine grid resolutions. The instability mechanism is investigated using the dynamic mode decomposition (DMD) technique and the spatial structure of the decomposed modes are further analyzed. It is found that the instability triggered by the high-temperature reactions strengthens the reflecting compression wave and pushes the shock wave further and disrupts the regularly oscillating mechanism. The spatial coherent structure from the DMD analysis shows the effect of this instability in different regions in the regularly oscillating flow field.
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Fabrikant, A. L. "Harbour oscillations generated by shear flow." Journal of Fluid Mechanics 282 (January 10, 1995): 203–17. http://dx.doi.org/10.1017/s0022112095000103.

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A new mechanism that could be responsible for excitation of long-period oscillations in partially enclosed harbours is discussed. This mechanism is based on the interaction between a shear flow and the harbour-basin natural mode and does not suppose any external exciting forces caused by wind waves, tsunami, etc. The growth rate of harbour oscillations is found in terms of a plane-wave reflection coefficient integrated on the wavenumber spectrum of the oscillating outflow field near the harbour entrance. Analytical considerations for simple shear flows (vortex sheet and jet) show that the growth rate changes its sign depending on the ratio of oscillation frequency to flow speed.
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3

Holstein-Rathlou, N. H., and D. J. Marsh. "A dynamic model of the tubuloglomerular feedback mechanism." American Journal of Physiology-Renal Physiology 258, no. 5 (May 1, 1990): F1448—F1459. http://dx.doi.org/10.1152/ajprenal.1990.258.5.f1448.

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We have reported oscillations in proximal tubular pressure and flow and in distal tubular pressure and chloride concentration in halothane-anesthetized Sprague-Dawley rats. These variables oscillated at the same frequency in each animal, approximately 35 mHz, but were out of phase with each other. We suggested that the oscillation arises within the tubuloglomerular feedback (TGF) system. As a test of this hypothesis, we have now developed a dynamic model to determine whether it can simulate the measured frequency and phase relationships with a realistic set of parameters. The model includes a detailed representation of pressure and flow in the tubules based on a reduced version of the Navier-Stokes equations. The NaCl concentration at the macula densa was used as the signal to the TGF mechanism. The tubular NaCl concentration was modeled by a partial differential equation based on conservation of mass. For a realistic set of parameter values the model accurately predicted oscillations with the same frequency and phase relationships among the oscillating variables as was found experimentally. Moreover, tubular NaCl handling significantly influenced the dynamic properties of the TGF system. Thus the model predicted a substantial phase shift of the NaCl concentration relative to the flow oscillation at the macula densa. The results are consistent with the hypothesis that the oscillations are caused by the TGF mechanism. The results further support the notion that the delays and damping caused by the tubule are responsible for the limited high-frequency response of renal autoregulation.
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4

Ханин, Ю. Н., та Е. Е. Вдовин. "Квантовые осцилляции релаксации фотопроводимости в p-i-n-гетеродиодах GaAs/InAs/AlAs". Физика и техника полупроводников 52, № 6 (2018): 591. http://dx.doi.org/10.21883/ftp.2018.06.45921.8679.

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AbstractThe photoconductivity and its relaxation characteristics in tunneling p – i – n GaAs/AlAs heterostructures under pulsed illumination is studied. Quantum oscillations in the photoconductivity are detected depending on the bias voltage with the period independent of the light wavelength, as well as an oscillating component of the relaxation curves caused by modulation of the recombination rate at the edge of a triangular quantum well in the undoped i layer, as in the case of photoconductivity oscillations. The common nature of oscillations of the steady-state photoconductivity and relaxation curves under pulsed illumination is directly confirmed by the lack of an oscillating component in both types of dependences of some studied p–i–n heterostructures. Simultaneous suppression of the observed oscillations of dependences of both types as the temperature increases to 80 K also confirms the proposed mechanism of their formation. The dependences of these oscillations on the magnetic field and light flux power are studied. Oscillation-amplitude suppression in a magnetic field of ~2 T perpendicular to the current is caused by the effect of the Lorentz force on the ballistic motion of carriers in the triangular-quantum-well region.
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Manor, Yair, John Rinzel, Idan Segev, and Yosef Yarom. "Low-Amplitude Oscillations in the Inferior Olive: A Model Based on Electrical Coupling of Neurons With Heterogeneous Channel Densities." Journal of Neurophysiology 77, no. 5 (May 1, 1997): 2736–52. http://dx.doi.org/10.1152/jn.1997.77.5.2736.

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Manor, Yair, John Rinzel, Idan Segev, and Yosef Yarom. Low-amplitude oscillations in the inferior olive: a model based on electrical coupling of neurons with heterogeneous channel densities. J. Neurophysiol. 77: 2736–2752, 1997. The mechanism underlying subthreshold oscillations in inferior olivary cells is not known. To study this question, we developed a single-compartment, two-variable, Hodgkin-Huxley-like model for inferior olive neurons. The model consists of a leakage current and a low-threshold calcium current, whose kinetics were experimentally measured in slices. Depending on the maximal calcium and leak conductances, we found that a neuron model's response to current injection could be of four qualitatively different types: always stable, spontaneously oscillating, oscillating with injection of current, and bistable with injection of current. By the use of phase plane techniques, numerical integration, and bifurcation analysis, we subdivided the two-parameter space of channel densities into four regions corresponding to these behavioral types. We further developed, with the use of such techniques, an empirical rule of thumb that characterizes whether two cells when coupled electrically can generate sustained, synchronized oscillations like those observed in inferior olivary cells in slices, of low amplitude (0.1–10 mV) in the frequency range 4–10 Hz. We found that it is not necessary for either cell to be a spontaneous oscillator to obtain a sustained oscillation. On the other hand, two spontaneous oscillators always form an oscillating network when electrically coupled with any arbitrary coupling conductance. In the case of an oscillating pair of electrically coupled nonidentical cells, the coupling current varies periodically and is nonzero even for very large coupling values. The coupling current acts as an equalizing current to reconcile the differences between the two cells' ionic currents. It transiently depolarizes one cell and/or hyperpolarizes the other cell to obtain the regenerative response(s) required for the synchronized oscillation. We suggest that the subthreshold oscillations observed in the inferior olive can emerge from the electrical coupling between neurons with different channel densities, even if the inferior olive nucleus contains no or just a small proportion of spontaneously oscillating neurons.
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6

Deineka, Kateryna, and Yuriy Naumenko. "Revealing the mechanism of stability loss of a two-fraction granular flow in a rotating drum." Eastern-European Journal of Enterprise Technologies 4, no. 1 (118) (August 31, 2022): 34–46. http://dx.doi.org/10.15587/1729-4061.2022.263097.

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The qualitative nature and quantitative parameters of motion instability of a two-fraction granular filler of a rotating drum were determined. The factors of motion instability and key parameters of the oscillating system were identified and their influence on the self-excitation of pulsed self-oscillations was estimated. Two continuous and one periodic steady-state modes of filler motion were found. Periodic self-oscillations due to the development of instability during the transition from continuous circulation mode to the wall layer mode were revealed. As factors of motion instability, filler dilatancy and damping effect of fine fraction particles on the pulsed interaction of coarse fraction particles were taken. It turned out that the main key parameter of the oscillating system is the drum speed, which determines a change in dilatancy. The increase in instability is realized as a reduction of the bifurcation values of speed and dilatancy. Other key parameters are the content of the fine fraction in the filler κff and the filling degree of the chamber κlf, the growth of which increases the self-oscillating instability. The features of the oscillatory system are the relaxation type, discontinuous nature of self-oscillations and hard self-excitation mode under bistability. The discontinuous character and oscillatory hysteresis increase with decreasing κff and κlf. The limit values of the dynamic motion parameters corresponding to the conditions of self-excitation of self-oscillations in the absence and presence of fine fraction were determined: 0.96–1.11 and 0.218–0.382 for the bifurcation value of relative speed, 0.745–0.855 and 0.24–0.322 for the bifurcation value of dilatancy. The effects found make it possible to substantiate the parameters of the self-oscillating process of processing polygranular materials in drum-type machines.
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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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8

Yeleukulov, Yerlan, Alfiya Atalykova, Algazy Zhauyt, Zhubanyshbay Abdimuratov, Saltanat Yussupova, Assel Alik, and Gaukhar Kenzhebayeva. "Mechanical analysis of vibratory conveyor mechanism." MATEC Web of Conferences 226 (2018): 01019. http://dx.doi.org/10.1051/matecconf/201822601019.

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The paper describes some of the basics of kinematics and dynamics of vibratory conveyor drive. Featured are dynamic modes of material that is being transported. Presented are the optimum material handling, and most rational mode. Introducing the empirical dependence transport speed as a function of angle bending conveyor, amplitude of oscillation of the transport container, the oscillation frequency excitation angle at which operates the actuating force and the coefficient mode of operation of the conveyor. Featured are some of the drive vibratory conveyors, and especially the operation of electromagnetic vibratory conveyor. In this paper is studied a vibratory conveyor that is placed on an elastic base. Using the closed contours method it was determined the system that needs to be solved to obtain graphical representation for the generalized coordinates determining the position of the mechanical system elements. The shaking conveyor represents the chase hanged or supported to the fixed section. The chase commits oscillating motions hereupon the cargo which is in the chase, migrates concerning to the chase. The nature of the flow and its parameters are determined by the nature of the oscillating committed by the chase. Justifying the dynamic parameters of the vibratory conveyor and a study of the strain-energy. Installation causes fluctuations fixed tray. Uniformly distributed load on the tray acts in each element of the mechanism. On the basis of the program MSC Adams investigated the strain-energy and kinetic-energy of each link mechanism with results and calculations.
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9

Cosgrove, R., M. Nicolls, H. Dahlgren, S. Ranjan, E. Sanchez, and R. Doe. "Radar detection of a localized 1.4 Hz pulsation in auroral plasma, simultaneous with pulsating optical emissions, during a substorm." Annales Geophysicae 28, no. 10 (October 29, 2010): 1961–79. http://dx.doi.org/10.5194/angeo-28-1961-2010.

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Abstract. Many pulsating phenomena are associated with the auroral substorm. It has been considered that some of these phenomena involve kilometer-scale Alfvén waves coupling the magnetosphere and ionosphere. Electric field oscillations at the altitude of the ionosphere are a signature of such wave activity that could distinguish it from other sources of auroral particle precipitation, which may be simply tracers of magnetospheric activity. Therefore, a ground based diagnostic of kilometer-scale oscillating electric fields would be a valuable tool in the study of pulsations and the auroral substorm. In this study we attempt to develop such a tool in the Poker Flat incoherent scatter radar (PFISR). The central result is a statistically significant detection of a 1.4 Hz electric field oscillation associated with a similar oscillating optical emission, during the recovery phase of a substorm. The optical emissions also contain a bright, lower frequency (0.2 Hz) pulsation that does not show up in the radar backscatter. The fact that higher frequency oscillations are detected by the radar, whereas the bright, lower frequency optical pulsation is not detected by the radar, serves to strengthen a theoretical argument that the radar is sensitive to oscillating electric fields, but not to oscillating particle precipitation. Although it is difficult to make conclusions as to the physical mechanism, we do not find evidence for a plane-wave-like Alfvén wave; the detected structure is evident in only two of five adjacent beams. We emphasize that this is a new application for ISR, and that corroborating results are needed.
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Tiberiu Petrescu, Florian Ion, Taher M. Abu-Lebdeh, and Antonio Apicella. "Study of an Oscillating Sliding Mechanism." American Journal of Engineering and Applied Sciences 11, no. 2 (February 1, 2018): 870–80. http://dx.doi.org/10.3844/ajeassp.2018.870.880.

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Дисертації з теми "Oscillating Mechanism"

1

Calderon, Antonino M. "An experimental driving mechanism for a rigid oscillating foil propeller." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62374.pdf.

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2

Мачача, Олександр Віталійович. "Розроблення та дослідження механізму третього класу основов’язальної машини". Магістерська робота, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19444.

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Робота присвячена аналізу та розробці механізму третього класу основов’язальної машини. Поставлені задачі аналізу механізму полягали в дослідженні призначення та галузі використання основов’язальної машини ОВ-7; дослідженні конструкції механізмів основов’язальної машини ОВ-7; кінематичному дослідженні механізму коливального руху вушкових голок основов’язальної машини ОВ-7. Поставлені задачі розробки механізму коливального руху вушкових голок основов’язальної машини полягали у геометричному синтезі механізму коливального руху вушкових голок основов’язальної машини нової конструкції, кінематичному дослідженні механізму коливального руху вушкових голок нової конструкції та силовому аналізу механізму коливального руху вушкових голок.
The work is devoted to the analysis and development of the mechanism of the third class of the basic knitting machine. The tasks of the mechanism analysis were to study the purpose and field of use of the basic knitting machine OV-7; study of the design of the mechanisms of the basic knitting machine OV-7; kinematic study of the mechanism of oscillating motion of the eyelets of the basic knitting machine OV-7. The tasks of developing the mechanism of oscillating movement of the eyelets of the warp knitting machine were geometric synthesis of the mechanism of oscillating motion of the eyelets of the warp knitting machine of new design, kinematic study of the mechanism of oscillating motion of the eyelets of the new design and force analysis of the mechanism of oscillating motion of eyelets.
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3

Jurisch, Martin. "On the mechanics of oscillating flames." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/61385.

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The major drive to advance the understanding of flames comes from industry as many technical devices propelled by flames are in constant need of design revisions and efficiency improvements. Lean-premixed combustion technology was one of such areas, which saw major advancements. Unfortunately, combustion devices operating in premixed mode often exhibit undesired flame oscillations, which may lead to damage or even failure of the combustor. The present work is dedicated to better understanding and predicting flame oscillation. A modelling framework based on high-order accurate Discontinuous Galerkin methods is presented to investigate the interaction of steadily propagating flames with pressure waves. The analysis of the results show that the time scale associated with the pressure wave incident upon the flame must be of the same order as the time scales in the primary reaction zone to lead to partial wave reflection and wave transmission at the flame. Hence providing a mechanism for initiating flame oscillation. The predictive capabilities of the Large Eddy Simulation technique in conjunction with the Probability Density Function model of the unresolved turbulence-chemistry interaction are demonstrated in the simulation of flame oscillation in industrially relevant combustors. Two test cases with increasing complexity are considered: a forced oscillating flame in a bluff-body stabilised combustor, and a self-excited flame oscillation in a swirl combustor with complex geometry. Good agreement between the measurements and the simulations is obtained. The flame dynamics are well captured by both simulations. The results obtained in the study of the bluff-body flame are used to identify suitable chemical markers which correlate well with the total heat release rate. The product of molecular oxygen and the ketenyl radical is found to correlate better with the total heat release rate than the commonly used formaldehyde-based markers in the investigated premixed fuel-lean ethylene-air flame. In the case of the swirl burner the predictions lead to the suggestion of a self-excited flame oscillation in the lateral direction as the result of an interaction of the flame with a vortex ring. The difference between the predicted and experimentally determined frequency of oscillation is 11 %.
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4

Faiman, Jiří. "Tříválcový 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-231763.

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The first part of this thesis deals with the examination of the eccentricity of the crank mechanism for individual variables kinematics and dynamics of crank mechanism, analyticaly computed in Matlab. Then it compares the different possibilities of balancing moments of inertia forces and propose a specific design chosen for the value of eccentricity. In the second part is designed a model of crankshaft mechanism based on the investigated parameters. These parameters were carried out by structural analysis in Ansys.
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5

Bradshaw, Joel. "Mathematical modelling of droplets climbing an oscillating plane." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33768/.

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Recent experiments [P. Brunet, J. Eggers, and R. Deegan, Phys. Rev. Lett. 99, 114501 (2007)] have shown that a liquid droplet on an inclined plane can be made to move uphill by sufficiently strong, vertical oscillations. In order to investigate this counterintuitive phenomenon we will derive three different models that qualitatively reproduce the main features of the experiment. For the first model the liquid's inertia and viscosity are assumed negligible, so that the motion of the droplet is dominated by the applied acceleration due to the oscillation of the plate, gravity and surface tension and that the droplet is thin. We explain how the leading order motion of the droplet can be separated into a spreading mode and a swaying mode. For a linear contact line law, the maximum rise velocity occurs when the frequencies of oscillation of the two modes are in phase. We show that, both with and without contact angle hysteresis, the droplet can climb uphill and also that, for certain contact line laws, the motion of the droplet can produce footprints similar to experimental results. We show that if the two modes are out of phase when there is no contact angle hysteresis, the inclusion of hysteresis can force them into phase. This in turn increases the rise velocity of the droplet and can, in some cases, cause a sliding droplet to climb. For the second model we use a two-dimensional flow where the Reynolds number is assumed large enough for viscosity to be neglected. We show that the leading order motion of the droplet can be separated into the same two modes and the net motion of the droplet is an oscillatory function of the frequency. For increasingly non-wetting droplets we discover that the rise velocity begins to oscillate very rapidly as a function of the static contact angle. What we also discover is that the change in the free surface of the droplet is actually a wave travelling travelling across the droplet, and the amount of modes present coincide with the rapid change in the rise velocity. Using a cubic contact line law and contact angle hysteresis we observe a droplet that can climb uphill for parameter values similar to that of the experiment. With the addition of a time dependent term within the contact line law we show that it is possible to obtain a multi-valued relationship between the velocity of the contact line and the respective contact angles, reproducing experimental observations seen for unsteady, moving contact lines. For the third model we again assume that the liquid's viscosity is negligible, similar to model 2, only now for a three-dimensional, thin droplet. For very small amplitudes the motion of the droplet is a combination of a swaying mode and a spreading mode that interact causing a net motion of the droplet. This motion is found to be an oscillatory function of the driving frequency and the magnitude of the peak rise velocity is proportional to one over the frequency squared. By examining the velocity of the centre of the droplet and the displacement of the contact line we see that the absolute maximums of both of these, over one period of oscillation, contain natural frequencies, which are evenly spaced with respect to the square root of the frequency of the oscillation.
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6

Sekerli, Murat. "Mechanisms of oscillations in coupled neuromechanical systems." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13421.

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7

Houara, Komba Eymard. "Reconstitution of tribological accommodation mechanisms for greased high loaded oscillating bearings." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI018.

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Les roulements soumis à des mouvements oscillatoires et des charges élevées sont nécessaires pour le fonctionnement de nombreux mécanismes industriels (actionneurs, commandes d’avions, machines pour l’usinage, robots, chaînes d’assemblages, …). Ces roulements sont soumis à des pressions de contact locales extrêmement élevées avec des vitesses de roulement faibles qui ne permettent pas une lubrification adéquate des interfaces des premiers corps avec de l’huile. Les essais d’endurance sur les roulements ont permis la reconstitution des courbes de dégradation pendant la vie du roulement. Des analyses des surfaces, effectués à chaque phase de la vie du roulement ont permis aussi bien de suivre l’évolution de la topographie à l’interface entre les pistes et les éléments roulants. D’autre parte, des analyses numériques par éléments finis ont permis d’obtenir des informations sur les distributions des contraintes et des déformations. Le croisement des résultats expérimentaux et numériques a donc permis la reconstruction des mécanismes locaux d’accommodation. Dans le cas d’un roulement oscillant non graissé, les déplacements relatifs et les contraintes sont principalement accommodés aux interfaces des premiers corps en contact, ce qui accélère l’endommagement final du roulement. Dans le cas d’un roulement oscillant graissé, une partie des déplacements relatifs et contraintes est accommodée dans une sous couche qui se forme dans la peau des éléments roulants. Cette accommodation se manifeste par l’accumulation de déformations plastiques qui s’avèrent être aussi à l’origine de l’endommagement final du roulement. L’analyse des surfaces de contact des roulements oscillants graissés montre qu’il se forme, en présence de la graisse et très tôt dans la vie du roulement, une couche (troisième corps graisse/particule et TTS en surface de la piste) qui protège les surfaces en contact. D’autre part, une expertise de roulement ayant fonctionné sur un avion de de type A340 révèle une forte similarité entre ses faciès d’usure et ceux obtenus lors des essais d’endurance, et valide ainsi les mécanismes d’accommodation reconstitués. Enfin, des questions portant sur les effets de la quantité de graisse, du glissement des éléments roulants, et des pauses sur un essai donné sont aussi traitées
Bearings subjected to oscillatory motions and high loads are necessary for the operation of several industrial mechanisms (actuators, aircraft controls, machining, robots, assembly lines, ...). These bearings are subjected to extremely high local contact pressures with low running speeds, which do not permit adequate lubrication of the interfaces of the first bodies with oil. Endurance tests perfomed on commercial bearings allowed at reconstructing the evolution of the degradation curves during the bearing life. Surface analyses carried out at each phase of the bearing life also allowed at following the evolution of the topography at the interface between the bearing raceways and the rolling elements. On the other hand, numerical analyses, by finite element method, have led to obtain information on the distributions of stresses and deformations. The dialogue between experimental and numerical results allowed the reconstruction of the local accomodation mechanisms. In the case of ungreased oscillating bearings, the relative displacements are mainly accommodated at the surfaces of the first bodies in contact, which accelerates the damage of the bearing. In the case of greased oscillating bearings, part of the relative displacements and stresses are accommodated at the subsurface of the rolling elements. This accommodation mechanism is manifested by the accumulation of plastic deformations which are at the origin of the final degradation of the bearing. The analysis of the contact surfaces of the raceways of the greased oscillating bearings shows as well that, in the presence of grease, a layer (third body mixture of grease and particles, and TTS on the track surface) protects the surfaces of the raceway and thus accommodates the other part of the displacements and stresses. On the other hand, the analysis of an airelon bearing, dismounted from an A340 type aircraft, revealed a strong similarity between its topographies and those obtained during the performed endurance tests, validateing the reconstructed accommodation mechanisms. Finally, questions about the effects of the amount of grease, sliding of the rolling elements, and pauses on a given test heve been discussed too
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McCorquodale, Mark W. "Interaction between oscillating-grid turbulence and a solid impermeable boundary." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49971/.

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The interaction of a boundary with turbulence is a defining feature of many turbulent flows, resulting in a turbulent boundary layer which plays a prominent role in the production and dissipation of turbulence. Commonly, this interaction is dominated by the effects of mean shear. However, more subtle aspects of the interaction, such as effects associated with turbulent motions impinging onto the boundary, are still thought to play a key role in giving rise to the boundary layer structure. Unfortunately, these aspects of the interaction are currently poorly understood. A better understanding of these aspects of the interaction may be derived by isolating them from the effects of mean shear through the study of zero-mean-shear turbulence interacting with a boundary. This study reports experimental work investigating the interaction between oscillating-grid turbulence (OGT) and a solid impermeable boundary. OGT is a commonly used experimental tool that produces a turbulent flow which is approximately homogeneous and isotropic in planes parallel to the oscillating grid but which is inhomogeneous in planes perpendicular to the oscillating grid. Throughout this study, instantaneous velocity measurements of the flow are obtained by applying two-dimensional particle imaging velocimetry to the vertical plane through the centre of the oscillating grid. A detailed preliminary study to characterise the flow generated by the OGT apparatus is initially performed. Visualisation of the flow close to the oscillating grid indicates that large-scale circulations are induced in OGT by the merging of grid-induced jets close to the tank walls. The installation of an open-ended cuboidal `inner box' below the grid is shown to inhibit the merging of these jets, thereby resulting in a more regular jet structure close to the oscillating grid and a corresponding reduction in mean flow within the inner box. It is also found that, contrary to assumptions in the literature, this amendment to the standard OGT apparatus is most effective when the top of the inner box is located close to the oscillating grid. The reduction in mean flow intensity that results from the use of a correctly installed inner box brings about a turbulent flow in which the mean flow velocity components are small compared to velocity fluctuations, thereby enabling a meaningful comparison to be made with zero-mean-shear turbulence. Consequently, the interaction between OGT and a solid impermeable boundary is studied to derive insight into the mechanisms governing the interaction of zero-mean-shear turbulence with boundaries. Results indicate that a critical aspect of the interaction is the blocking of a boundary-normal flux of turbulent kinetic energy across the boundary-affected region, which acts to increase the magnitude of the boundary-tangential turbulent velocity components, relative to the far-field trend, but not the boundary-normal turbulent velocity component. This feature arises as a result of the anisotropic nature of the flow produced by OGT, whereby the turbulent fluctuations decay with distance normal to and away from the oscillating grid, and would not be present in a turbulent flow that was otherwise homogeneous above the boundary-affected region of the flow. This observation provides new insight into the validity of well-established models of the interaction of zero-mean-shear turbulence and a solid impermeable boundary and provides a physical mechanism that explains the disparity in previously reported measurements relating to this problem. The results reported are also in support of intercomponent energy transfer mechanisms previously proposed to govern the interaction of zero-mean-shear turbulence with boundaries, including viscous and `return-to-isotropy' mechanisms. That is, within a thin region adjacent to the boundary, approximately equal in thickness to the viscous sublayer, the data indicate that turbulent motions incident towards the boundary are more energetic than motions away, which are characteristics of an intercomponent energy transfer primarily driven by the viscous dissipation of turbulent kinetic energy. In addition, at the edge of the boundary-affected region, where the magnitude of the boundary-tangential turbulent velocity components exceeds the magnitude of the boundary-normal turbulent velocity component, results indicate that an intercomponent energy transfer occurs from the boundary-tangential turbulent velocity components to the boundary-normal turbulent velocity component in a so-called `return-to-isotropy' energy transfer. However, the data also indicate the presence of an additional intercomponent energy transfer, from the boundary-normal turbulent velocity component to the boundary-tangential turbulent velocity components over a thin region outside the viscous sublayer. Comparison to previously published results of related studies indicates that this mechanism is also prevalent in previous work, but is not captured within existing models of intercomponent energy transfer at the boundary. Results further indicate that the intercomponent energy transfer mechanisms are not independent of the blocking of the boundary-normal turbulent kinetic energy flux. That is, the blocking of the boundary-normal turbulent kinetic flux promotes anisotropy within the boundary-affected region of the flow and thereby induces a stronger `return-to-isotropy' energy transfer mechanism. Hence, the effect of a solid impermeable boundary on turbulent velocity components in zero-mean-shear turbulence depends critically on the nature of the original turbulent field (i.e. homogeneous or inhomogeneous turbulence).
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9

Haslam, Michael C. "Mechanics of oscillating flow in tubes of elliptic cross-section." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq21043.pdf.

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10

Jia, XiaoJing 1977. "The mechanisms and the predictability of the Arctic oscillation and the North Atlantic oscillation /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103026.

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The Arctic Oscillation (AO) and the North Atlantic Oscillation (NAO) are the most pronounced modes of extratropical atmospheric wintertime variability in the Northern Hemisphere. This thesis investigates different aspects of the AO and NAO on the in traseasonal and seasonal time scales. First, the question of how the differences between the AO and NAO are influenced by the choice of the definitions of the NAO and to what extent the AO and NAO differ from each other is investigated using the daily NCEP/NCAR reanalysis data spanning 51 boreal winters. One AO index and four different NAO indices are used in this study. It is found that the AO and NAO are quite similar to each other when both are defined using pattern-based indices, while some notable differences are observed between them when the NAO is defined using a station/gridpoint-based index. Then the predictability of the AO and NAO is examined using a simple general circulation model (SGCM). Numerical experiments are performed to determine the sensitivity of the setup processes of the AO and NAO to the details of the initial conditions. The predictive skills for the AO and NAO are compared to each other. Finally, the potential role of tropical Pacific forcing in driving the seasonal variability of the AO is explored using both observations and the SGCM. The results indicate that a negative thermal forcing over the western tropical Pacific and a positive forcing north of the equatorial mid-Pacific play important roles in producing an AO-like atmospheric response.
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Книги з теми "Oscillating Mechanism"

1

Gao, Ying. Investigations on the mechanism of the Belousov-Zhabotinsky oscillating reaction. Göttingen: Cuvillier Verlag, 1994.

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1931-, Taylor John Gerald, and Mannion C. L. T, eds. Coupled oscillating neurons. London: Springer-Verlag, 1992.

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Kneubühl, Fritz K. Oscillations and Waves. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997.

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Vibrations and waves. Hoboken, N.J: Wiley, 2009.

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5

Wave physics: Oscillations--solitons--chaos. 4th ed. Berlin: Springer, 2009.

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6

Nettel, Stephen. Wave Physics: Oscillations - Solitons - Chaos. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003.

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7

Landa, Polina S. Regular and Chaotic Oscillations. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001.

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8

Wolfram, Stadler, ed. Non-linear oscillations. 2nd ed. Oxford: Clarendon Press, 1988.

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Smith, Walter Fox. Waves and oscillations: A prelude to quantum mechanics. New York: Oxford University Press, 2010.

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Waves and oscillations: A prelude to quantum mechanics. New York: Oxford University Press, 2010.

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Частини книг з теми "Oscillating Mechanism"

1

Corzanu, Valentin, and Andrei Corzanu. "Design of Double Oscillating Sliding Mechanism." In Proceedings of the International Conference on Mechanical Engineering (ICOME 2022), 122–30. Dordrecht: Atlantis Press International BV, 2023. http://dx.doi.org/10.2991/978-94-6463-152-4_14.

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2

Braier, Zdeněk, Pavel Šidlof, Martin Pustka, and Pavel Fišer. "Measurement, Evaluation and Comparison of Behavior of Linear SGT Motor with Oscillating Mass." In Advances in Mechanism Design III, 296–303. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83594-1_31.

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3

Holm, Darryl D., Ruiao Hu, and Oliver D. Street. "Coupling of Waves to Sea Surface Currents Via Horizontal Density Gradients." In Mathematics of Planet Earth, 109–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18988-3_8.

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AbstractThe mathematical models and numerical simulations reported here are motivated by satellite observations of horizontal gradients of sea surface temperature and salinity that are closely coordinated with the slowly varying envelope of the rapidly oscillating waves. This coordination of gradients of fluid material properties with wave envelopes tends to occur when strong horizontal buoyancy gradients are present. The nonlinear models of this coordinated movement presented here may provide future opportunities for the optimal design of satellite imagery that could simultaneously capture the dynamics of both waves and currents directly.The model derived here appears in two levels of approximation: first for rapidly oscillating waves, and then for their slowly varying envelope (SVE) approximation obtained by using the WKB approach. The WKB wave-current-buoyancy interaction model derived here for a free surface with significant horizontal buoyancy gradients indicates that the mechanism for the emergence of these correlations is the ponderomotive force of the slowly varying envelope of rapidly oscillating waves acting on the surface currents via the horizontal buoyancy gradient. In this model, the buoyancy gradient appears explicitly in the WKB wave momentum, which in turn generates density-weighted potential vorticity whenever the buoyancy gradient is not aligned with the wave-envelope gradient.
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Kotaleski, Jeanette Hellgren, Anders Lansner, and Sten Grillner. "Production of Phase Lag in Chains of Neural Networks Oscillating Through an Escape Mechanism." In Computational Neuroscience, 65–70. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-4831-7_11.

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5

Fujiwara, T., Shinya Tsukamoto, and M. Miyagawa. "Analysis of the Grinding Mechanism with Wheel Head Oscillating Type CNC Crankshaft Pin Grinder." In Advances in Abrasive Technology VIII, 163–70. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-974-1.163.

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6

Ilie, Carolina C., Zachariah S. Schrecengost, and Elina M. van Kempen. "Oscillations." In Classical Mechanics, 115–42. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003365709-5.

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7

Ma, Hongbin. "Oscillating Motion and Heat Transfer Mechanisms of Oscillating Heat Pipes." In Oscillating Heat Pipes, 141–201. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4939-2504-9_4.

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8

Hentschke, Reinhard. "Small Oscillations." In Classical Mechanics, 155–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48710-6_6.

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Benacquista, Matthew J., and Joseph D. Romano. "Small Oscillations." In Classical Mechanics, 261–97. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68780-3_8.

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10

Kulp, Christopher W., and Vasilis Pagonis. "Coupled Oscillations." In Classical Mechanics, 373–406. Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781351024389-12.

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Тези доповідей конференцій з теми "Oscillating Mechanism"

1

Wada, Shin-Ichi, and Koichiro Sawa. "Degradation Phenomenon of Electrical Contacts by 3-D Oscillating Mechanism:3-D Oscillating Mechanism for Trial." In 2008 IEEE Holm Conference on Electrical Contacts (Holm 2008). IEEE, 2008. http://dx.doi.org/10.1109/holm.2008.ecp.57.

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2

Wada, S. I., and K. Sawa. "Degradation phenomena of electrical contacts using hammering oscillating mechanism and micro-sliding mechanism: oscillating amplitude, natural frequency and damping ratio caused by the mechanisms." In 26th International Conference on Electrical Contacts (ICEC 2012). IET, 2012. http://dx.doi.org/10.1049/cp.2012.0678.

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3

Dong, Jin-hu, An-ping Qiu, and Ran Shi. "Temperature influence mechanism of micromechanical silicon oscillating accelerometer." In 2011 IEEE Power Engineering and Automation Conference (PEAM). IEEE, 2011. http://dx.doi.org/10.1109/peam.2011.6135118.

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4

Sancheti, S., V. F. Fusco, and J. A. C. Stewart. "Self oscillating detection mechanism in FET active antennas." In 23rd European Microwave Conference, 1993. IEEE, 1993. http://dx.doi.org/10.1109/euma.1993.336574.

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5

Sayar, Ersin. "Boiling Heat Transfer From an Oscillated Water Column Through a Porous Domain: A Simplified Thermodynamic Analysis." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66901.

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Heat transfer in an oscillating water column in the transition regime of pool boiling to bubbly flow is investigated experimentally and theoretically. Forced oscillations are applied to water via a frequency controlled dc motor and a piston-cylinder device. Heat transfer is from the electrically heated inner surface to the reciprocating flow. The heat transfer in the oscillating fluid column is altered by using stainless steel scrap metal layers (made off open-cell discrete cells) which produces a porous medium within the system. The effective heat transfer mechanism is enhanced and it is due to the hydrodynamic mixing of the boundary layer and the core flow. In oscillating flow, the hydrodynamic lag between the core flow and the boundary layer flow is somehow significant. At low actuation frequencies and at low heat fluxes, heat transfer is restricted in the single phase flows. The transition regime of pool boiling to bubbly flow is proposed to be a remedy to the stated limitation. The contribution by the pool boiling on heat transfer appears to be the dominant mechanism for the selected low oscillation amplitudes and frequencies. Accordingly the regime is a transition from pool boiling to bubbly flow. Nucleate-bubbly flow boiling in oscillating flow is also investigated using a simplified thermodynamic analysis. According to the experimental results, bubbles induce highly efficient heat transfer mechanisms. Experimental study proved that the heater surface temperature is the dominant parameter affecting heat transfer. At greater actuation frequencies saturated nucleate pool boiling ceases to exist. Actuation frequency becomes important in that circumstances. The present investigation has possible applications in moderate sized wicked heat pipes, boilers, compact heat exchangers and steam generators.
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6

Padilla, Rodrigo, Vibhav Durgesh, and Tao Xing. "Application of Proper Orthogonal Decomposition to Study the Flow Over an Oscillating Flag." In ASME 2022 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/fedsm2022-86969.

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Abstract Fluid-Structure-Interaction (FSI) is the coupling between a flowing fluid and a structure that results in either a static or dynamic structure deformation. This investigation focused on applying Proper Orthogonal Decomposition (POD) to study the fluid flow behavior of an oscillating flag and using POD modes to quantify the changes in flow behavior associated with the change in flag oscillation modes. For this purpose, aerodynamic load, membrane location, and Particle Image Velocimetry (PIV) measurements were performed for a selected flag model. The flag location measurements helped identify the change in oscillation shapes and modes with change in flow conditions, while the aerodynamic load data allowed us to quantify the impact of flag oscillations on the aerodynamic load experienced by the flag. The PIV data provide flow field information around the oscillating flag and were used to perform POD analysis. We observed that the POD mode, energy, and time-varying coefficients changed with change in the oscillation modes of the flag (i.e., change from mode-2 to mode-3 oscillations). Flow reconstruction using the first three POD modes allowed us to capture changes generated in large-scale structures in the flow due to changes in the oscillation modes. Flow reconstruction using the remaining POD modes allowed us to observe the behavior of small-scale flow structures and K-H vortices in the wake of the flag. The POD approach used here allowed us to quantify the change in flow behavior and understand the underlying FSI mechanism therein.
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Vislousova, I. N., V. V. Kotov, O. N. Lesnjak, A. A. Matrosov, and R. A. Bardakova. "SIMULATION OF FORCE ACTION ON OSCILLATING PLOUGHSHARE OF HARVEST MACHINE." In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DSTU-Print, 2020. http://dx.doi.org/10.23947/itno.2020.52-55.

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The dynamics of the drive of the digging mechanism with oscillating ploughshare is investigated. To determine the input impact, a model of the ploughshare-soil interaction process is proposed, based on which the axial forces in the ploughshare connecting rods and moment of resistance on the eccentric shaft are calculated. To verify the adequacy of the model to the experiment, the analytical axial forces and the moment of resistance were compared with the force dependences obtained as a result of tensometric tests. Small oscillations in the drive are investigated on the basis of linear dynamic model. Analytical and empirical functional dependences of the amplitudes of the torques from the oscillation frequency of the drive, operating speed, and ploughshare installation depth are obtained.
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Shao, Junpeng, Mingshan Chi, Yanqin Zhang, and Bin Xu. "Kinematic simulation of polishing head oscillating mechanism based on COSMOSMotion." In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023233.

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9

Pontes, B. R., J. M. Balthazar, and V. A. Oliveira. "Stick-Slip Chaos in a Non-Ideal Self-Excited System." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48628.

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In engineering practical systems the excitation source is generally dependent on the system dynamic structure. In this paper we analyze a self-excited oscillating system due to dry friction which interacts with an energy source of limited power supply (non ideal problem). The mechanical system consists of an oscillating system sliding on a moving belt driven by a limited power supply. In the oscillating system considered here, dry friction acts as an excitation mechanism for stick-slip oscillations. The stick-slip chaotic oscillations are investigated because the knowledge of their dynamic characteristics is an important step in system design and control. Many engineering systems present stick-slip chaotic oscillations such as machine tools, oil well drillstrings, car brakes and others.
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Yoon, S. Y., W. S. Kang, Y. C. Jang, G. H. Kim, S. H. Lee, and J. W. Hong. "Discharge mechanism of Aqua-plasma inside an oscillating bubble in electrolyte." In 2011 IEEE 38th International Conference on Plasma Sciences (ICOPS). IEEE, 2011. http://dx.doi.org/10.1109/plasma.2011.5993193.

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Звіти організацій з теми "Oscillating Mechanism"

1

Culick, F. E., F. E. Marble, and E. E. Zukoski. Mechanisms of Exciting Pressure Oscillations in Ramjet Engines. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada172546.

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2

Ekegren, Michael, and Sandra LeGrand. Incorporating terrain roughness into helicopter landing zone site selection by using the Geomorphic Oscillation Assessment Tool (GOAT) v1.0. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42162.

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The Geomorphic Oscillation Assessment Tool (GOAT) quantifies terrain roughness as a mechanism to better explain forward arming and refueling point (FARP) suitability for Army aviation. An empirically driven characteristic of FARP consideration, surface roughness is a key discriminator for site utility in complex terrain. GOAT uses a spatial sampling of high-resolution elevation and land cover data to construct data frames, which enable a relational analysis of component and aggregate site suitability. By incorporating multiple criteria from various doctrinal sources, GOAT pro-duces a composite quality assessment of the areal options available to the aviation commander. This report documents and demonstrates version 1.0 of the GOAT algorithms developed by the U.S. Army Engineer Research and Development Center (ERDC). These details will allow users familiar with R to implement it as a stand-alone program or in R Studio.
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3

Romero-Chamorro, José Vicente, and Sara Naranjo-Saldarriaga. Weather Shocks and Inflation Expectations in Semi-Structural Models. Banco de la República Colombia, November 2022. http://dx.doi.org/10.32468/be.1218.

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Colombia is particularly affected by the El Niño Southern Oscillation (ENSO) weather fluctuations. In this context, this study explores how the adverse weather events linked to ENSO affect the inflation expectations in Colombia and how to incorporate these second-round effects into a small open economy New Keynesian model. Using BVARx models we provide evidence that the inflation expectations obtained from surveys and break-even inflation measures are affected by weather supply shocks. Later, using this stylised fact, we modify one of the core forecasting models of the Banco de la República by incorporating the mechanisms in which weather-related shocks affect marginal costs and inflation expectations. We find that ENSO shocks had an important role in both inflation and the dynamics of inflation expectations, and that policymakers should consider this fact.
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4

de Abreu Barbosa Coelho, Joao. Investigation of alternative mechanisms to neutrino oscillations in the MINOS experiment; Investigacao de Mecanismos Alternativos a Oscilacao de Neutrinos no Experimentos MINOS. Office of Scientific and Technical Information (OSTI), January 2012. http://dx.doi.org/10.2172/1247712.

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