Gotowe bibliografie tematyczne / Small-amplitude oscillations

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Gotowa bibliografia na temat „Small-amplitude oscillations”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Small-amplitude oscillations"

Becker, E., W. J. Hiller i T. A. Kowalewski. "Experimental and theoretical investigation of large-amplitude oscillations of liquid droplets". Journal of Fluid Mechanics 231 (październik 1991): 189–210. http://dx.doi.org/10.1017/s0022112091003361.

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Finite-amplitude, axially symmetric oscillations of small (0.2 mm) liquid droplets in a gaseous environment are studied, both experimentally and theoretically. When the amplitude of natural oscillations of the fundamental mode exceeds approximately 10% of the droplet radius, typical nonlinear effects like the dependence of the oscillation frequency on the amplitude, the asymmetry of the oscillation amplitude, and the interaction between modes are observed. As the amplitude decreases due to viscous damping, the oscillation frequency and the amplitude decay factor reach their asymptotical values predicted by linear theory. The initial behaviour of the droplet is described quite satisfactorily by a proposed nonlinear inviscid theoretical model.

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Kozlov, Victor, Stanislav Subbotin i Ivan Karpunin. "Supercritical Dynamics of an Oscillating Interface of Immiscible Liquids in Axisymmetric Hele-Shaw Cells". Fluids 8, nr 7 (12.07.2023): 204. http://dx.doi.org/10.3390/fluids8070204.

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The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large contrast in viscosity. The axis of symmetry of the cell is oriented vertically; the interface without oscillations is axially symmetric. An oscillating pressure drop is set at the cell boundaries, due to which the interface performs radial oscillations in the form of an oscillating “tongue” of a low-viscosity liquid, periodically penetrating into a more viscous liquid. An increase in the oscillation amplitude leads to the development of a system of azimuthally periodic structures (fingers) at the interface. The fingers grow when the viscous liquid is forced out of the layer and reach their maximum in the phase of maximum displacement of the interface. In the reverse course, the structures decrease in size and, at a certain phase of oscillations, take the form of small pits directed toward the low-viscosity fluid. In a conical cell, a bifurcation of period doubling with an increase in amplitude is found; in a flat cell, it is absent. A slow azimuthal drift of finger structures is found. It is shown that the drift is associated with the inhomogeneity of the amplitude of fluid oscillations in different radial directions. The fingers move from the region of a larger to the region of a lower amplitude of the interface oscillations.

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Dolgopolov, S. I. "Mathematical simulation of hard excitation of cavitation self-oscillations in a liquid-propellant rocket engine feed system". Technical mechanics 2021, nr 1 (30.04.2021): 29–36. http://dx.doi.org/10.15407/itm2021.01.029.

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Hard self-oscillation excitation differs from soft excitation in that self-oscillations are set up only if the initial departure of an oscillating system from equilibrium is strong enough. Experimental studies of cavitation oscillations in hydraulic systems with cavitating pumps of liquid-propellant rocket engines ((LPREs) include works that describe hard excitation of cavitation oscillations. By mow, hard excitation regimes have not been explained theoretically, to let alone their mathematical simulation. This paper presents a mathematical model of hard excitation of cavitation oscillations in a LPRE feed system, which comprises a mathematical model of cavitation self-oscillations in a LPRE feed system that accounts for pump choking and an external disturbance model. A mechanism of hard excitation of cavitation oscillations in a LPRE feed system is proposed. It is well known that hard excitation of cavitation self-oscillations may take place in cases where the pump feed system is near the boundary of the cavitation self-oscillation region. In this case, the self-oscillation amplitudes are small, and they are limited only by one nonlinearity (cavity volume vs. pump inlet pressure and flow relationship). Under excitation of sufficient intensity, the pump inlet pressure and flow find themselves in the choking characteristic; this may be responsible for choking and developed cavitation self-oscillations, which remain of interrupted type and do not go into the initial small-amplitude oscillations even after excitation removal. A mathematical simulation of hard excitation of cavitation self-oscillations was conducted to determine the parameters of cavitation self-oscillations in a bench feed system of a test pump. The simulation results show that without an external disturbance the pump system exhibits small-amplitude self-oscillations. On an external disturbance, developed (interrupted) cavitation oscillations are set up in the system, which is in agreement with experimental data. The proposed mathematical model of hard excitation of cavitation self-oscillations in a LPRE feed system allows one to simulate a case observed in an experiment in which it was possible to eliminate cavitation self-oscillations by an external disturbance.

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Mashnich, G. P., V. S. Bashkirtsev i A. I. Khlystova. "Small-amplitude oscillations in solar filaments". Astronomy Reports 56, nr 3 (marzec 2012): 241–49. http://dx.doi.org/10.1134/s1063772912030055.

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Oliver, Ramón. "Prominence Seismology Using Small Amplitude Oscillations". Space Science Reviews 149, nr 1-4 (27.05.2009): 175–97. http://dx.doi.org/10.1007/s11214-009-9527-4.

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Kazakevič, Michael I., i Victoria E. Volkova. "THE INDUCED OSCILLATIONS OF FLEXIBLE PRESTRESSED ELEMENTS OF STRUCTURES (SYMMETRICAL SYSTEM)". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 6, nr 1 (28.02.2000): 55–59. http://dx.doi.org/10.3846/13921525.2000.10531564.

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The results of the investigations of dynamic behaviour of the flexible prestressed structure elements are presented in the paper. The given physical model can be applied to the flexible structures like sloping arches, shells, bending plates, elements of the large space antenna fields (LSAF). The dynamic behaviour of the investigated systems is described by the equations where ϵ is damping coefficient, α,β are coefficients determining the character of non-linear restoring force are parameters of outer effect. The analysis of the “skeleton” curves disclosed the double qualities of system (1). Thus, “large” oscillations possess the peculiarities of the rigid system behaviour, and “small” oscillations possess the qualities of soft systems. The character of the oscillation amplitude changing with the increase or decrease of the excitation frequencies is followed in Fig 1. The establishment of the forced oscillation regimes from one branch to another is accompanied not only by the transition from “large” oscillations to “small”, or vice versa, but also by the development of the combination tones (2ω, 3ω 5ω, …, ω/2, ω/3). The analytical solutions for “large” and “small” forced oscillations are given by harmonic balance method. The solution was found in the form φ = Acosωt for “large” oscillation, and for “small” oscillation, where . The for curves disclosed unstable branches of amplitude-frequency curves and critical value amplitude of “large” oscillations were obtained. The methods and results of the computing experiment are presented in the paper. For working out the software necessary for the given task, the method of numerical integration (Runge-Kutta method of the fourth order), spectral analysis (Hertzel algorithm), computer graphics, etc were used. The results of the numerical integration are well-coordinated with the analytical solution for the “framework” curves and for the amplitude-frequency curves of forced oscillations.

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LI, QIAN SHU, i RUI ZHU. "MESOSCOPIC DESCRIPTION OF CHEMICAL SUPERCRITICAL HOPF BIFURCATION". International Journal of Bifurcation and Chaos 14, nr 07 (lipiec 2004): 2393–97. http://dx.doi.org/10.1142/s0218127404010643.

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The mesoscopic dynamic behavior of the Oregonator model of the Belousov–Zhabotinsky chemical reaction is investigated as the model system experiences a supercritical Hopf bifurcation from focus to limit cycle oscillation. The study is performed by stochastically simulating the corresponding chemical master equation. Comparing the mesoscopic dynamic results with those obtained by the macroscopic dynamics, we find in the mesoscopic description a new type of oscillating state, in which large-amplitude oscillations and small-amplitude oscillations appear randomly alternately. This new state comes out spontaneously within a certain region called Hopf bifurcation range by us. In the mesoscopic description, the Hopf bifurcation point cannot be shown, being replaced by a Hopf bifurcation range. Furthermore, the applications of this new oscillating state to internal signal stochastic resonance are pointed out.

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LYUBIMOV, D. V., V. V. KONOVALOV, T. P. LYUBIMOVA i I. EGRY. "Small amplitude shape oscillations of a spherical liquid drop with surface viscosity". Journal of Fluid Mechanics 677 (27.04.2011): 204–17. http://dx.doi.org/10.1017/jfm.2011.76.

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The analysis of surface oscillations of liquid drops allows measurements of the surface tension and viscosity of the liquid. For small oscillations of spherical drops with a free surface, classical formulae by Rayleigh and Lamb relate these quantities to the frequency and damping of the oscillations. In many cases, however, the drop's surface is covered by a surface film, typically an oxide layer or a surfactant, exhibiting a rheological behaviour different from the bulk fluid. It is the purpose of this paper to investigate how such surface properties influence the oscillation spectrum of a spherical drop. For small bulk shear viscosity, the cases of small, finite and large surface viscosities are discussed, and the onset of aperiodic motion as a function of the surface parameters is also derived.

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Baier, Gerold, i Klaus Wegmann. "Notizen: Dynamical Behavior During the Oxidation of Aniline with Bromate". Zeitschrift für Naturforschung A 42, nr 12 (1.12.1987): 1458–60. http://dx.doi.org/10.1515/zna-1987-1218.

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Spontaneous oscillations occur during the oxidation of aniline with bromate in sulfuric acid (a Körös-Orban System). In a continuous flow, stirred tank reactor besides a simple relaxation oscillation of large amplitude, a small amplitude oscillation of higher frequency was observed, so were various dynamical phenomena which can be understood as a combination of the two simple oscillations. For some regions of parameter space, the appearance of deterministic chaos seems probable. The role of metal impurities is discussed.

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Wang, Wei, Kaiming Yang i Yu Zhu. "Optimal Frequency and Amplitude of Vertical Viewpoint Oscillation for Improving Vection Strength and Reducing Neural Constrains on Gait". Entropy 23, nr 5 (28.04.2021): 541. http://dx.doi.org/10.3390/e23050541.

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Inducing self-motion illusions referred as vection are critical for improving the sensation of walking in virtual environments (VE). Adding viewpoint oscillations to a constant forward velocity in VE is effective for improving vection strength under static conditions. However, the effects of oscillation frequency and amplitude on vection strength under treadmill walking conditions are still unclear. Besides, due to the visuomotor entrainment mechanism, these visual oscillations would affect gait patterns and be detrimental for achieving natural walking if not properly designed. This study was aimed at determining the optimal frequency and amplitude of vertical viewpoint oscillations for improving vection strength and reducing gait constraints. Seven subjects walked on a treadmill while watching a visual scene. The visual scene presented a constant forward velocity equal to the treadmill velocity with different vertical viewpoint oscillations added. Five oscillation patterns with different combinations of frequency and amplitude were tested. Subjects gave verbal ratings of vection strength. The mediolateral (M-L) center of pressure (CoP) complexity was calculated to indicate gait constraints. After the experiment, subjects were asked to give the best and the worst oscillation pattern based on their walking experience. The oscillation frequency and amplitude had strong positive correlations with vection strength. The M-L CoP complexity was reduced under oscillations with low frequency. The medium oscillation amplitude had greater M-L CoP complexity than the small and large amplitude. Besides, subjects preferred those oscillation patterns with large gait complexity. We suggested that the oscillation amplitude with largest M-L CoP complexity should first be chosen to reduce gait constraints. Then, increasing the oscillation frequency to improve vection strength until individual preference or the boundary of motion sickness. These findings provide important guidelines to promote the sensation of natural walking in VE.

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Rozprawy doktorskie na temat "Small-amplitude oscillations"

Merline, William Jon. "Observations of small-amplitude oscillations in the radial velocity of Arcturus". Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187322.

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High accuracy measurements of variations in the radial velocity of the K 1 giant star Arcturus have been obtained. The observations span 5 years and have a point-to-point repeatability of 5 m s⁻¹ and night-to-night stability of better than 20 m s⁻¹. Velocity oscillations of Arcturus were discovered during the course of this work in 1986. Extensive additional data, presented here, indicate that Arcturus is exhibiting global nonradial acoustic oscillations with characteristics similar to those occurring in the Sun. A Fabry-Perot interferometer, used in transmission, is employed to accurately tag the stellar wavelengths. The light is dispersed by a cross-dispersed echelle. About 750 points in the spectrum are monitored over 4250-4750 Å. All observations were done using the 0.9 m telescope of the University of Arizona on Kitt Peak, which is dedicated half-time for use with this instrument. A dedicated facility was crucial to this work - because of the changing nature of the oscillations, many observing runs, over several years, were required to understand the star's behavior. Continuous data sets as long as 30 days were acquired. The velocity power spectra are complicated and variable. There is substantial evidence that the variations are solar-like p-mode oscillations. At least 10 frequencies have been identified, over the range 8.3 to 1.7 days. A tell-tale spectrum of evenly spaced modes is apparent, yielding a value for Δv₀ ≈ 1.2 μHz. The average power spectrum peaks near 3 days, approximately as expected from the acoustic cut-off frequency. There is a broad envelope of power with a distribution reminiscent of that seen in the Sun. The oscillations do not maintain phase coherence and they show abrupt discontinuities, indicating that something is disrupting them, as in the Sun. Coherence of the modes is estimated to be a few weeks to a few months. Driving is likely to be due to stochastic excitation by turbulent convection. Arcturus may be one of the first analogues of solar-like oscillations and/or the first member of a new class of variable stars. Because Arcturus is an evolved star of approximately solar mass, these oscillations will provide a test for stellar evolution theory, as well as for asteroseismology and the study of driving mechanisms for stellar oscillations.

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Moore, Michael Wayne. "Measuring the second harmonic amplitude of an oscillating torsion pendulum to detect small forces /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/9666.

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Kumara, Akshaya G. "Small-amplitude Oscillations in Hypersonic Double-cone Flow". Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6030.

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Unsteady compressible flows typically pose problems with rich dynamics. The broad concern of this thesis is the shock wave unsteadiness that arises in external high-speed flow over a double-cone body. This unsteadiness is driven by complex interaction between the shock wave and the region of high shear and separation in the external flow. It is well known that the canonical double-cone problem exhibits two different classes of unsteadiness, labeled “pulsations” and “oscillations.” The former is characterized by unsteady shock wave motion over large spatial scales, whereas in the latter the nature of unsteadiness is distinct and occurs at a relatively smaller scale. The detailed mechanisms that sustain pulsations and oscillations are yet to be completely understood. In the present work, experiments were performed in the Roddam Narasimha Hypersonic Wind Tunnel (RNHWT) at Mach 6 to carefully investigate the phenomena of oscillations. Time-resolved schlieren and wall pressure data were obtained for various double-cone models with the second cone angle fixed at 90◦, while the first cone angle and ratio of the slant lengths were varied as parameters. Schlieren data revealed two dissimilar types, or modes, of flow oscillations. Spectral proper orthogonal decomposition (SPOD) analysis performed on experimental data showed the existence of a dominant time scale for the oscillations, and also provided the associated low-rank dynamics. The two different oscillation modes are found to exhibit distinct Strouhal number scaling. Given the direct dependence of shock strength on the flow Mach number (M ), the boundaries of unsteady flow states are expected to show slight changes with M. However, qualitative flow features and the underlying mechanisms that drive unsteadiness are expected to remain the same. Overall, this work reveals new flow behavior and furthers our understanding of the double-cone flow.

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Hello i 謝文泰. "Wake Measurements of an Airfoil Oscillating at Small Amplitude". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/93856501179094358393.

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Książki na temat "Small-amplitude oscillations"

Cooper, Stephanie. The physiology of vocal cord movement. Redaktorzy John Phillips i Sally Erskine. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198834281.003.0062.

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Filler, Jeffrey R. Response of the shear layers separating from a circular cylinder to small amplitude rotational oscillation. 1989.

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Części książek na temat "Small-amplitude oscillations"

Pécseli, Hans L. "Small Amplitude Waves in Anisotropic Warm Plasmas". W Waves and Oscillations in Plasmas, 311–22. Second edition. | Boca Raton : CRC Press, [2020] |: CRC Press, 2020. http://dx.doi.org/10.1201/9780429489976-15.

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Konstantinidis, Efstathios, i László Baranyi. "Hydrodynamics of Cylinders Oscillating with Small Amplitude in Still Fluid or Free Stream". W Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 43–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-55594-8_6.

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"Small-Amplitude Oscillations". W Lectures on Classical Mechanics, 189–205. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814678469_0009.

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"Small Amplitude Waves in Anisotropic Warm Plasmas". W Waves and Oscillations in Plasmas, 347–56. CRC Press, 2016. http://dx.doi.org/10.1201/b12702-20.

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Epstein, Irving R., i John A. Pojman. "Complex Oscillations and Chaos". W An Introduction to Nonlinear Chemical Dynamics. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195096705.003.0014.

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After studying the first seven chapters of this book, the reader may have come to the conclusion that a chemical reaction that exhibits periodic oscillation with a single maximum and a single minimum must be at or near the apex of the pyramid of dynamical complexity. In the words of the song that is sung at the Jewish Passover celebration, the Seder, “Dayenu” (It would have been enough). But nature always has more to offer, and simple periodic oscillation is only the beginning of the story. In this chapter, we will investigate more complex modes of temporal oscillation, including both periodic behavior (in which each cycle can have several maxima and minima in the concentrations) and aperiodic behavior, or chaos (in which no set of concentrations is ever exactly repeated, but the system nonetheless behaves deterministically). Most people who study periodic behavior deal with linear oscillators and therefore tend to think of oscillations as sinusoidal. Chemical oscillators are, as we have seen, decidedly nonlinear, and their waveforms can depart quite drastically from being sinusoidal. Even after accepting that chemical oscillations can look as nonsinusoidal as the relaxation oscillations shown in Figure 4.4, our intuition may still resist the notion that a single period of oscillation might contain two, three, or perhaps twenty-three, maxima and minima. As an example, consider the behavior shown in Figure 8.1, where the potential of a bromide-selective electrode in the BZ reaction in a CSTR shows one large and two small extrema in each cycle of oscillation. The oscillations shown in Figure 8.1 are of the mixed-mode type, in which each period contains a mixture of large-amplitude and small-amplitude peaks. Mixedmode oscillations are perhaps the most commonly occurring form of complex oscillations in chemical systems. In order to develop some intuitive feel for how such behavior might arise, we employ a picture based on slow manifolds and utilized by a variety of authors (Boissonade, 1976; Rössler, 1976; Rinzel, 1987; Barkley, 1988) to analyze mixed-mode oscillations and other forms of complex dynamical behavior.

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Basu, Sarbani, i William J. Chaplin. "Introduction". W Asteroseismic Data Analysis. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691162928.003.0001.

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This chapter covers the basics of stellar pulsations, which are the main preoccupation of asteroseismology. Stellar pulsations may be detected by observing the variations of a star's brightness as a function of time. Radial velocity observations are also used in certain cases, though most pulsating stars have been studied using brightness variations. The focus of this chapter (and the book as a whole) is on stars with solar-like pulsations—the small-amplitude oscillations that are continually excited (in a stochastic manner) and damped by turbulence in the outer convection zones of the stars. In addition to a brief history of the study of solar-type oscillations, this chapter also provides an introduction to the basic appearance and properties of the pulsation spectra of solar-like oscillators.

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Huang, Haibo, Hao Su i Changhai Ru. "Design and Evaluation of a Piezo-Driven Ultrasonic Cell Injector". W Prototyping of Robotic Systems, 327–55. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0176-5.ch011.

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In this chapter, a novel piezo-driven cell injection system for automatic batch injection of suspended cells is presented; it has simplified operational procedure and better performance than the previous ones. Specifically, this new piezo-driven cell injector design has three aspects of merits: 1) by centralizing the piezo oscillation energy on the injector pipette, it eliminates the vibration amplitude of other parts of the micromanipulator; 2) meanwhile, a small piezo stack is sufficient to perform the cell injection process; and 3) detrimental lateral tip oscillations of the injector pipette are attenuated to satisfactory amount even without mercury column. The removal of mercury enables wide applications of this advanced cell injection technology in a number of cell manipulation scenarios. Furthermore, ultrasonic vibration micro-dissection (UVM) theory is utilized to analyze the piezo-driven cell injection process, and lateral oscillation of injector pipettes is investigated. Experiments on cell injection of a large amount of zebrafish embryos (n=300) indicate that the injector pipette is capable of piercing through cell membranes with low injection speed and almost no deformation of the cell wall, but with a high success rate.

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Singh, Sukhmander, Bhavna Vidhani, Sonia Yogi, Ashish Tyagi, Sanjeev Kumar i Shravan Kumar Meena. "Plasma Waves and Rayleigh–Taylor Instability: Theory and Application". W Plasma Science - Recent Advances, New Perspectives and Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109965.

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The presence of plasma density gradient is one of the main sources of Rayleigh–Taylor instability (RTI). The Rayleigh–Taylor instability has application in meteorology to explain cloud formations and in astrophysics to explain finger formation. It has wide applications in the inertial confinement fusion to determine the yield of the reaction. The aim of the chapter is to discuss the current status of the research related to RTI. The current research related to RTI has been reviewed, and general dispersion relation has been derived under the thermal motion of electron. The perturbed densities of ions and electrons are determined using two fluid approach under the small amplitude of oscillations. The dispersion equation is derived with the help of Poisson’s equation and solved numerically to investigate the effect of various parameters on the growth rate and real frequency. It has been shown that the real frequency increases with plasma density gradient, electron temperature and the wavenumber, but magnetic field has opposite effect on it. On the other hand, the growth rate of instability increases with magnetic field and density gradient, but it decreases with electron temperature and wave number.

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Koch, Christof. "Linearizing Voltage-Dependent Currents". W Biophysics of Computation. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195104912.003.0016.

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We hinted several times at the fact that a small excitatory synaptic input in the presence of voltage-dependent channels will lead to a local depolarization, followed by a hyperpolarization. Those of us who built our own radios will recognize such an overshooting response as being indicative of so-called RLC circuits which include resistances, capacitances as well as inductances. As a reminder, a linear inductance is defined as a circuit element whose instantaneous I—V relationship is, where L is the inductance measured in units of henry (abbreviated as H). Although neurobiology does not possess any coils or coillike elements whose voltage is proportional to the current change, membranes with certain types of voltage- and time-dependent conductances can behave as (/they contained inductances. We talk of a phenomenological inductance, a phenomenon first described by Cole (1941) and Cole and Baker (1941) in the squid axon (see Cole, 1972). Under certain circumstances, discussed further below, such damped oscillations can become quite prominent. This behavior can be obtained in an entirely linear system, as can be observed when reducing (in numerical simulations) the amplitude of the synaptic input (or step current): even though the voltage excursion around steady-state becomes smaller and smaller, the overshoot persists. It is not due to any amplification inherent in such a membrane but is caused by its time- and voltage-dependent nature. Such a linear membrane, whose constitutive elements do not depend on either voltage or time, and which behaves like a bandpass element, has been called quasi-active (Koch, 1984) to distinguish it from a truly active, that is, nonlinear membrane. In this chapter, we will explain in considerable detail how an inductance-like behavior can arise from these membranes by linearizing the Hodgkin-Huxley equations. Experimentally, this can be done by considering the small-signal response of the squid giant axon and comparing it against the theoretical predicted value, a further test of the veracity of the Hodgkin-Huxley equations, which they passed with flying colors.

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Streszczenia konferencji na temat "Small-amplitude oscillations"

Jovanovic, M. R. "Turbulence suppression in channel flows by small amplitude transverse wall oscillations". W 2006 American Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/acc.2006.1656374.

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Cleaver, David, Zhi-Jin Wang i Ismet Gursul. "Effect of Airfoil Shape on Flow Control by Small-Amplitude Oscillations". W 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-756.

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Chen, Xianbing, Chengyi Long, Dongbao Zhu, Puzhen Gao, Xiaming Kong i Lu Yao. "Effects of Power Oscillations on Natural Circulation Flow Instability With a Neutronic-Thermo-Hydraulic Loop". W 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93303.

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Abstract Nuclear power in a water-cooled reactor changes with reactivity under the influence of temperature and void fraction. Effects of power oscillations on natural circulation are experimentally investigated with a neutronic-thermo-hydraulic loop to better understand neutronic-thermo-hydraulic effects. Heating power can be precisely controlled by a DC power supply. Both stable natural circulation flow and flow instability experiments are conducted. Amplitude of flow oscillations increases with the increase of amplitude of power oscillations for the stable natural circulation flow. Period and amplitude of power oscillations are compared with those of flow oscillations. Period of flow oscillations corresponds with the period of power oscillations due to the relative balance between driving force and resistance. Amplitude and period of power oscillations are changed to obtain stability boundary by keeping other parameters constant. Experimental results indicated that small amplitude and short period power oscillations has little influence of the stability boundary. However, power oscillations cause the premature of flow instability when period and amplitude of power oscillations are further increased. The destabilizing effects of power oscillations on natural circulation flow depend on the period and amplitude. The stability region reduces with the increase of amplitude and period of power oscillation in this experimental loop.

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Paul, V. Geen, Sakthivel Periyasamy i Kishor Nikam. "Unsteady aerodynamics analysis for small amplitude pitch oscillations of transonic cruiser aircraft". W 2017 First International Conference on Recent Advances in Aerospace Engineering (ICRAAE). IEEE, 2017. http://dx.doi.org/10.1109/icraae.2017.8297231.

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Cleaver, David, Zhijin Wang i Ismet Gursul. "Delay of Stall by Small Amplitude Airfoil Oscillations at Low Reynolds Numbers". W 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-392.

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Fujisawa, N., K. Ikemoto i K. Nagaya. "Vortex Shedding From a Rotary Oscillating Cylinder". W ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0058.

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Abstract Vortex shedding resonance of a circular cylinder wake to a forced rotational oscillation has been investigated experimentally by measuring the velocity fluctuations in the wake, pressure distributions over the cylinder surface, and visualizing the flow field with respect to cylinder oscillations. The vortex shedding resonance occurs near the natural shedding frequency at small-amplitude of cylinder oscillations, while the peak resonance frequency shifts to a lower one with an increase in oscillation amplitude. The estimated drag and lift forces acting on the cylinder indicate that the phase lag of fluid forces to the cylinder oscillations increases with an increase in oscillation amplitude, supporting the change of resonance frequency with oscillation amplitude. The comparative study of the measured pressure distributions and the simultaneous flow visualizations with respect to cylinder rotation shows the mechanisms of phase lag, which is due to the strengthened vortex formation and the modification of the surface pressure distributions.

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Majdalani, J. "A novel flowfield solution in a rectangular cavity subject to small amplitude oscillations". W 2nd AIAA, Theoretical Fluid Mechanics Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2693.

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Poirel, Dominique, i Weixing Yuan. "Aerodynamic Moment of Self-Sustained Small Amplitude Oscillations of an Airfoil at Rec = 77,000". W 26th AIAA Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-6244.

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MOUCH, T., T. MCLAUGHLIN i J. ASHWORTH. "Unsteady flows produced by small amplitude oscillations of the canard of an X-29 model". W 7th Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-2229.

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Rhode, David L., J. Wayne Johnson i Brian F. Allen. "Effect of Flow Instabilities and Self-Sustained Oscillations on Labyrinth Seal Leakage Resistance". W ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-214.

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Two flow instabilities involving a bifurcated flow pattern were discovered for the throughflow jet in a stepped labyrinth seal. A bifurcation stability map was developed showing which combinations of tooth clearance and step height occur in which of the three flow regimes. These instabilities, along with self-sustained flow oscillations, were experimentally explored to obtain a preliminary understanding of their effect on seal leakage. Computer-captured visualization videos were used to measure the throughflow angle oscillation amplitudes, frequencies and mean flow trajectory angles. For small tooth clearances, the intermediate step height case, which exhibited the sharpest flow deflection and largest oscillation amplitude, gave the highest leakage resistance. Further, for larger tooth clearances, the large step height cases, located farthest on the stability map into the Oscillatory Bifurcated regime, gave the highest resistance. Thus, for large clearances the oscillating nature of the Oscillatory Bifurcation flow pattern appears to give enhanced leakage resistance via increased turbulent mixing.

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