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Artykuły w czasopismach na temat „Surface mode oscillations”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Klimov, Alexandr V., and Akop V. Antonyan. "Research of features of oscillating process’ behavior in the nonlinear system of individual traction drive of an electrobus." Izvestiya MGTU MAMI 17, no. 1 (2023): 87–96. http://dx.doi.org/10.17816/2074-0530-115233.

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BACKGROUND: When a vehicle is in motion, self-oscillations which properties are dependent on slip rate in a contact patch may occur in the area of tire interaction with ground surface. Oscillations frequency will vary in dependence with value of wheel slip relative to ground surface. Soft self-oscillations are excited by variable set of initial conditions at full slip in traction and driven wheel rolling modes as well as in mixed braking mode with partial slip. Hard mode of self-oscillations occurs at full wheel slip in braking mode. These processes have a negative impact on the processes in e

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2

Kuzmychov, I., O. Lukash, O. Senkevych, and O. Gribovsky. "SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS." Radio physics and radio astronomy 30, no. 1 (2025): 065–73. https://doi.org/10.15407/rpra30.01.065.

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Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction between volume "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors. Methods and Methodology. Basic quasi-optical techniques were employed. The electric field structures of considered oscillation types were measured using the probe-induced perturbation method

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3

Zhileykin, Mikhail M., Pavel V. Sirotin, Sergey S. Nosikov, and Nikolay N. Pulyaev. "Method for detecting the loss of stability of the movement of tractors when towing a trailer or a coupled unit." Tractors and Agricultural Machinery 90, no. 1 (2023): 39–48. http://dx.doi.org/10.17816/0321-4443-321266.

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BACKGROUND:Currently, combines and tractors, being the most energy-intensive transport and technological machines for agricultural purposes, largely determine the possibility of transition to an efficient and environmentally friendly agricultural economy, and also provide the technical aspect of the transformation of the agro-industrial complex into the leading sector of the countrys industry. One of the sources of dynamic loads in the units and subsystems of tractor equipment are self-oscillating modes. AIMS:Study of the conditions for the occurrence of self-oscillating processes in the

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4

H Thomas, John. "Oscillations in Sunspots." Australian Journal of Physics 38, no. 6 (1985): 811. http://dx.doi.org/10.1071/ph850811.

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Recent observational and theoretical work on oscillations in sunspots is reviewed. The characteristic 3-minute umbral oscillations and flashes are reSonant modes of the sunspot itself, whereas the 5-minute oscillations in the umbra are a passive response to forcing by p modes in the surrounding convection zone. The observational evidence suggests that the fundamental cause of the 3-minute oscillations is the photospheric fast-mode resonance, with chromospheric slow-mode resonances perhaps producing additional oscillation frequencies in the chromosphere. Observations and theoretical models of t

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5

Mitura, Z., S. L. Dudarev, and M. J. Whelan. "Theoretical Investigations of RHEED Oscillations." Microscopy and Microanalysis 5, S2 (1999): 710–11. http://dx.doi.org/10.1017/s1431927600016871.

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Nowadays there is great interest in the application of reflection high energy electron diffraction (RHEED) to monitor the growth of ultra thin films. This popularity of RHEED arose from the discovery of RHEED intensity oscillations in the early eighties. Namely, it was experimentally found that if the growth of a material follows a layer-by-layer mode then regular oscillating changes in the intensity of the specular beam occur, and the period of the oscillations corresponds to the deposition of one atomic layer of the material. These findings are of great practical importance and consequently

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6

Liu, Yunqiao, and Benlong Wang. "Dynamics and surface stability of a cylindrical cavitation bubble in a rectilinear vortex." Journal of Fluid Mechanics 865 (March 1, 2019): 963–92. http://dx.doi.org/10.1017/jfm.2019.103.

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In this paper, we formulate the dynamic equations of radial and surface modes for a cylindrical cavitation bubble subject to a prescribed uniform rectilinear vortex flow. The potential flow in the bulk volume of the external flow is modelled using the general mode decomposition approach. The stability of surface modes is investigated under linear analysis. The effects of confinement due to a limited flow domain in a water tunnel and viscosity at the bubble surface are evaluated, which can be fairly neglected for the cylindrical cavitation bubbles discussed. Our model is capable of predicting t

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7

Wang, Minyang, Shang-Ping Xie, Samuel S. P. Shen, and Yan Du. "Rossby and Yanai Modes of Tropical Instability Waves in the Equatorial Pacific Ocean and a Diagnostic Model for Surface Currents." Journal of Physical Oceanography 50, no. 10 (2020): 3009–24. http://dx.doi.org/10.1175/jpo-d-20-0063.1.

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AbstractMesoscale activities over the equatorial Pacific Ocean are dominated by the Rossby and Yanai modes of tropical instability waves (TIWs). The TIW-induced surface velocity has not been accurately estimated in previous diagnostic models, especially for the meridional component across the equator. This study develops a diagnostic model that retains the acceleration terms to estimate the TIW surface velocity from the satellite-observed sea surface height. Validated against moored observations, the velocity across the equator is accurately estimated for the first time, much improved from exi

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8

Ignatyev, Alexander Anatolevich, Irina Pavlovna Nasad, and Tat'yana Gennadievna Nasad. "Modeling lathe dynamic system in terms of estimated dampening coefficient of autocorrelation function of oscillations." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2023, no. 2 (2023): 17–22. http://dx.doi.org/10.24143/2072-9502-2023-2-17-22.

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Part machining on the lathes with automated tools is a complex process that depends on the properties  of the lathe dynamic system. Oscillations in processing the main parts determine the dynamic quality of the lathes, quality of the surface layer and resistance of the cutting tool, therefore, it is necessary to identify the methods to control the operation mode. Increased efficiency of the process is provided by the forced cutting modes, which can lead to the deterioration of processing quality and premature wear of a cutting tool. Theoretical definition of rational cutting modes causes

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9

Strohmayer, T. E. "Oscillations of Rotating Neutron Stars." International Astronomical Union Colloquium 128 (1992): 299–304. http://dx.doi.org/10.1017/s0002731600155386.

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AbstractWe use a perturbation technique to compute the rotational corrections to the non-radial oscillation spectrum of a realistic neutron-star model. We compute, to first order in the rotation rate, the corrections to the normal mode eigenfrequencies and eigenfunctions. We find that l = l0 oscillations are coupled to l = l0 ± 1 oscillations by the Coriolis force. For the toroidal modes, this coupling introduces a non-zero radial component to the velocity field. We have used this result to compute the neutrino damping rates for several corrected toroidal modes. This damping mechanism is inope

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10

MacLeod, Morgan, Michelle Vick, and Abraham Loeb. "Tidal Wave Breaking in the Eccentric Lead-in to Mass Transfer and Common Envelope Phases." Astrophysical Journal 937, no. 1 (2022): 37. http://dx.doi.org/10.3847/1538-4357/ac8aff.

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Abstract The evolution of many close binary and multiple star systems is defined by phases of mass exchange and interaction. As these systems evolve into contact, tidal dissipation is not always sufficient to bring them into circular, synchronous orbits. In these cases, encounters of increasing strength occur while the orbit remains eccentric. This paper focuses on the outcomes of close tidal passages in eccentric orbits. Close eccentric passages excite dynamical oscillations about the stars’ equilibrium configurations. These tidal oscillations arise from the transfer of orbital energy into os

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11

Cocciaro, Bruno, Sandro Faetti, and Maurizio Nobili. "Capillarity effects on surface gravity waves in a cylindrical container: wetting boundary conditions." Journal of Fluid Mechanics 231 (October 1991): 325–43. http://dx.doi.org/10.1017/s0022112091003415.

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Surface capillary–gravity waves are experimentally investigated in a cylindrical basin subjected to a horizontal oscillation by using a high-sensitivity optical method. We study the low-oscillation-amplitude regimes for a fluid which wets the vertical walls and we show that the presence of the capillary meniscus can effect greatly the main properties of the system. Both the free decay and the forced oscillations of surface oscillations are investigated. The amplitude, the phase and the damping of gravity waves are investigated in detail. The damping of the fundamental surface mode is found to

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12

Saio, Hideyuki. "Pulsation of magnetic stars." Proceedings of the International Astronomical Union 9, S301 (2013): 197–204. http://dx.doi.org/10.1017/s1743921313014324.

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AbstractSome Ap stars with strong magnetic fields pulsate in high-order p modes; they are called roAp (rapidly oscillating Ap) stars. The p-mode frequencies are modified by the magnetic fields. Although the large frequency separation is hardly affected, small separations are modified considerably. The magnetic field also affects the latitudinal amplitude distribution on the surface. We discuss the properties of axisymmetric p-mode oscillations in roAp stars.

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13

Persinger, Michael A. "Potential Gravitational - Solar Electromagnetic Spectral Radiance Interaction as the Source of the Earth’s Background Free Oscillations." International Letters of Chemistry, Physics and Astronomy 21 (November 2013): 11–14. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.21.11.

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The origins of the continuous free oscillations of the whole earth have been attributed to coupling between the solid earth and atmosphere primarily through the fundamental spheroidal mode 0S29 oscillation of ~3.7 mHz. The origins of these interference patterns have been attributed to an excitation source just above the Earth’s surface. However, comparable surface oscillations have been measured in the Sun’s photosphere. The cube root of the product of the gravitational constant, the spectral radiance of the sun, and the square of the frequency produced an acceleration value that was identical

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14

Persinger, Michael A. "Potential Gravitational - Solar Electromagnetic Spectral Radiance Interaction as the Source of the Earth’s Background Free Oscillations." International Letters of Chemistry, Physics and Astronomy 21 (November 4, 2013): 11–14. http://dx.doi.org/10.56431/p-scxfvs.

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The origins of the continuous free oscillations of the whole earth have been attributed to coupling between the solid earth and atmosphere primarily through the fundamental spheroidal mode 0S29 oscillation of ~3.7 mHz. The origins of these interference patterns have been attributed to an excitation source just above the Earth’s surface. However, comparable surface oscillations have been measured in the Sun’s photosphere. The cube root of the product of the gravitational constant, the spectral radiance of the sun, and the square of the frequency produced an acceleration value that was identical

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15

Dyadya, S., О. Kozlova, and Ye Kushnir. "Investigation of the formation of a machined surface profile during end milling with a tool with a long overhang." Innovative Materials and Technologies in Metallurgy and Mechanical Engineering, no. 2 (December 7, 2021): 50–54. http://dx.doi.org/10.15588/1607-6885-2021-3-8.

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Purpose. Investigate the mechanism of forming the profile of the machined surface when milling with a tool with a long overhang. Methodology. Experimental method was used with a special stand, which makes it possible to simulate an elastic system of a part with different dynamic properties, record oscillograms of oscillations of a part and a tool during the cutting process. Milling was performed with a milling cutter with cutting modes in which self-oscillations occur. To determine the patterns of movement of the part and the tool, the method of aligning the fragments of oscillograms was

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16

Fahrbach, Michael, Min Xu, Wilson Ombati Nyang’au, et al. "Damped Cantilever Microprobes for High-Speed Contact Metrology with 3D Surface Topography." Sensors 23, no. 4 (2023): 2003. http://dx.doi.org/10.3390/s23042003.

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We addressed the coating 5 mm-long cantilever microprobes with a viscoelastic material, which was intended to considerably extend the range of the traverse speed during the measurements of the 3D surface topography by damping contact-induced oscillations. The damping material was composed of epoxy glue, isopropyl alcohol, and glycerol, and its deposition onto the cantilever is described, as well as the tests of the completed cantilevers under free-oscillating conditions and in contact during scanning on a rough surface. The amplitude and phase of the cantilever’s fundamental out-of-plane oscil

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17

Szentirmay, Zs. "Slow-mode surface plasma oscillations in layered structures." Physical Review B 36, no. 5 (1987): 2607–13. http://dx.doi.org/10.1103/physrevb.36.2607.

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18

Williams, J. E. Ffowcs, and Y. P. Guo. "On resonant nonlinear bubble oscillations." Journal of Fluid Mechanics 224 (March 1991): 507–29. http://dx.doi.org/10.1017/s0022112091001854.

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If a bubble were produced with an initial surface distortion, the energy carried by surface modes could be converted to other modes by nonlinear interaction, a conversion that provides a possible mechanism of second generation by bubbles. Longuet-Higgins (1989a,b) has argued that volume pulsation would be excited at twice the frequency of the distortion mode and that the response to such excitation is ‘surprisingly large’ when its frequency is close to the natural resonance frequency of the volumetrical mode. It is shown in this paper that this is feasible only if the driving system is suffici

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19

Musoke, Elle, Bernd Krauskopf, and Hinke M. Osinga. "A Surface of Heteroclinic Connections Between Two Saddle Slow Manifolds in the Olsen Model." International Journal of Bifurcation and Chaos 30, no. 16 (2020): 2030048. http://dx.doi.org/10.1142/s0218127420300487.

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The Olsen model for the biochemical peroxidase-oxidase reaction has a parameter regime where one of its four variables evolves much slower than the other three. It is characterized by the existence of periodic orbits along which a large oscillation is followed by many much smaller oscillations before the process repeats. We are concerned here with a crucial ingredient for such mixed-mode oscillations (MMOs) in the Olsen model: a surface of connecting orbits that is followed closely by the MMO periodic orbit during its global, large-amplitude transition back to another onset of small oscillatio

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20

Qin, Z., X. Zou, and F. Weng. "Arctic and Antarctic four-month oscillations detected from Advanced Microwave Sounding Unit-A measurements." Antarctic Science 24, no. 5 (2012): 507–13. http://dx.doi.org/10.1017/s0954102012000417.

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AbstractSatellite microwave measurements can penetrate through clouds and therefore provide unique information of surface and near-surface temperatures and surface emissivity. In this study, the brightness temperatures from NOAA-15 Advanced Microwave Sounding Unit-A (AMSU-A) are used to analyse the surface temperature variation in the Arctic and Antarctic regions during the past 13 years from 1998–2010. The data from four AMSU-A channels sensitive to surface are analysed with wavelet and Fourier spectrum techniques. A very pronounced maximum is noticed in the period range centred around four m

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21

Abi Chebel, Nicolas, Jiří Vejražka, Olivier Masbernat, and Frédéric Risso. "Shape oscillations of an oil drop rising in water: effect of surface contamination." Journal of Fluid Mechanics 702 (May 30, 2012): 533–42. http://dx.doi.org/10.1017/jfm.2012.205.

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AbstractInertial shape oscillations of heptane drops rising in water are investigated experimentally. Diameters from 0.59 to 3.52 mm are considered, corresponding to a regime where the rising motion should not affect shape oscillations for pure immiscible fluids. The interface, however, turns out to be contaminated. The drag coefficient is considerably increased compared to that of a clean drop due to the well-known Marangoni effect resulting from a gradient of surfactant concentration generated by the fluid motion along the interface. Thanks to the decomposition of the shape into spherical ha

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22

Volina, T., S. Pylypaka, and V. Babka. "THE MOTION OF A PARTICLE ON A WAVY SURFACE DURING ITS TRANSLATIONAL CIRCULAR OSCILLATIONS IN HORIZONTAL PLANES." Odes’kyi Politechnichnyi Universytet Pratsi 1, no. 63 (2021): 44–52. http://dx.doi.org/10.15276/opu.1.63.2021.05.

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The rough plane is a universal structural element of many machines and devices for sifting and separation of parts of technological material. The motion of particles on the horizontal plane, which performs oscillating rectilinear or circular motion, is the most studied. A wavy surface with a sinusoidal cross-sectional line as a working surface will significantly change the trajectories of their motion. The mathematical description of such a motion will change accordingly. The sliding of a particle in a plane will be a partial case of sliding on a wavy surface when the amplitude of the sinusoid

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23

Okazaki, Atsuo T., and Shoji Kato. "One-Armed Adiabatic Oscillations of a Nonself-gravitating Polytropic Disk. I. A Disk with Constant Thickness." Publications of the Astronomical Society of Japan 37, no. 4 (1985): 683–96. https://doi.org/10.1093/pasj/37.4.683.

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Abstract One-armed global oscillations in a nonself-gravitating polytropic disk are investigated. The unperturbed disk, which rotates around a star, is axisymmetric, geometrically thin, and extends infinitely in the radial direction. One-armed perturbations superposed in the disk are inviscid and adiabatic. Our attention is concentrated on a particular case where the disk has a constant thickness, since in this case we can separate oscillations into the radial and the vertical ones. It is found that there are one-armed retrograde wave modes which are trapped in an inner region of the disk. The

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24

Zrnić, D., P. Berglez, and G. Brenn. "Weakly nonlinear shape oscillations of a Newtonian drop." Physics of Fluids 34, no. 4 (2022): 043103. http://dx.doi.org/10.1063/5.0085070.

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Nonlinear axisymmetric shape oscillations of a Newtonian drop in a vacuum are investigated theoretically, for fundamental interest and for their relevance in transport processes across the drop surface. The weakly nonlinear analysis is carried out for, but not limited to, the modes of initial drop deformation up to m = 4. The drop Ohnesorge number covers the range between 0.01 and 1. The weakly nonlinear approach, which is carried to third order, accounts for the coupling of different oscillation modes. With increasing surface deformation, the oscillations develop an asymmetry of the times dur

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25

Nizhegorodov, A. I., and V. Z. Lapshin. "IMPROVEMENT OF STRUCTURAL AND DYNAMIC PROPERTIES OF THE HEARTH PLATE OF AN ELECTRIC ROASTING FURNACE FOR BULK MATERIALS." Spravochnik. Inzhenernyi zhurnal, no. 333 (December 2024): 27–34. https://doi.org/10.14489/hb.2024.12.pp.027-034.

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In this work, we consider the basic dynamical system of electric roasting furnaces, i.e., an oscillating movable hearth plate for vibration displacement of bulk particles. The main disadvantage of oscillating dynamical systems consists in fluctuations in the oscillation amplitude due to its sensitivity to minor changes in the excitation and natural frequency, as well as to external factors. We report experimental data on the duration and velocity of movement of loose material along the hearth plate surface on the example of expanded vermiculite, which ensure the highest quality of the obtained

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26

Weijer, Wilbert, Ernesto Muñoz, Niklas Schneider, and François Primeau. "Pacific Decadal Variability: Paced by Rossby Basin Modes?" Journal of Climate 26, no. 4 (2013): 1445–56. http://dx.doi.org/10.1175/jcli-d-12-00316.1.

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Abstract A systematic study is presented of decadal climate variability in the North Pacific. In particular, the hypothesis is addressed that oceanic Rossby basin modes are responsible for enhanced energy at decadal and bidecadal time scales. To this end, a series of statistical analyses are performed on a 500-yr control integration of the Community Climate System Model, version 3 (CCSM3). In particular, a principal oscillation pattern (POP) analysis is performed to identify modal behavior in the subsurface pressure field. It is found that the dominant energy of sea surface temperature (SST) v

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27

Kumar, Praphull, and Dean M. Townsley. "Gravity Modes on Rapidly Rotating Accreting White Dwarfs and Their Variation after Dwarf Novae." Astrophysical Journal 951, no. 2 (2023): 122. http://dx.doi.org/10.3847/1538-4357/acd1df.

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Abstract Accreting white dwarfs (WDs) in cataclysmic variables (CVs) show short-period (tens of minutes) brightness variations that are consistent with nonradial oscillations similar to gravity (g) modes observed in isolated WDs. The dwarf nova GW Librae was the first CV in which nonradial oscillations were observed and continues to be the best-studied accreting WD displaying these pulsations. Unlike isolated WDs, accreting WDs rotate rapidly, with spin periods comparable to or shorter than typical low-order oscillation periods. Accreting WDs also have a different relationship between their in

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Stankevych, Olena. "МATHEMATICAL MODEL OF ACOUSTIC EMISSION FROM MODE II CRACK". Computer Design Systems. Theory and Practice 5, № 1 (2023): 1–7. http://dx.doi.org/10.23939/cds2023.01.001.

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The dynamic problem of determining the wave field of displacements on the surface of an elastic half-space caused by the opening of an internal mode II crack has been solved. Using the method of boundary integral equations, a change in the amplitude-frequency characteristics of elastic oscillations on the surface of a solid body depending on the size of the defect, its depth, and the distance from the epicenter to the observation point was determined.

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Serykh, Ilya V., and Dmitry M. Sonechkin. "El Niño–Global Atmospheric Oscillation as the Main Mode of Interannual Climate Variability." Atmosphere 12, no. 11 (2021): 1443. http://dx.doi.org/10.3390/atmos12111443.

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The interannual variability of the global mean monthly anomalies of near-surface air temperature, sea-level pressure, wind speed near the surface, amount of precipitation and total cloudiness was investigated. The amplitudes of the anomalies of these hydrometeorological characteristics between opposite phases of the Global Atmospheric Oscillation (GAO) were calculated. The regional element of the GAO in the tropics of the Indian and Pacific Oceans is the Southern Oscillation. The results show that the oscillations of these characteristics are associated with the GAO not only in the tropical be

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30

Limarchenko, O., O. Klimenkov, O. Nefedov, and O. Konstantinov. "CHARACTER OF MANIFESTATION OF NONLINEARITIES FOR VIBRATION DISTURBANCE OF MOTION OF ELLIPSOIDAL RESERVOIR WITH LIQUID WITH A FREE SURFACE." Bulletin Taras Shevchenko National University of Kyiv. Mathematics Mechanics, no. 1 (41) (2020): 47–50. http://dx.doi.org/10.17721/1684-1565.2020.01-41.11.47-50.

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The problem with vibration disturbance of the reservoir of ellipsoidal shape, partially filled with a liquid, is under consideration. For the construction of the model, we use the before developed method, based on the use of non-Cartesian parametrization of the domain, occupied by a liquid. And the method of the auxiliary domain for satisfying boundary conditions on tank walls above the unperturbed free surface of a liquid, where the liquid can pass in its perturbed motion. The liquid is considered as ideal incompressible. The mathematical model of the system is constructed based on the variat

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Cummings, D. L., and D. A. Blackburn. "Oscillations of magnetically levitated aspherical droplets." Journal of Fluid Mechanics 224 (March 1991): 395–416. http://dx.doi.org/10.1017/s0022112091001817.

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In experiments to measure the surface energy of a magnetically levitated molten metal droplet by observation of its oscillation frequencies, Rayleigh's equation is usually used. This assumes that the equilibrium shape is a sphere, and the surface restoring force is due only to surface tension. This work investigates how the vibrations of a non-rotating liquid droplet are affected by the asphericity and additional restoring forces that the levitating field introduces. The calculations show that the expected single frequency of the fundamental mode is split into either three, when there is an ax

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Kjeldsen, Hans, and Timothy R. Bedding. "Observations of Solar-Like Oscillations." Highlights of Astronomy 13 (2005): 407–10. http://dx.doi.org/10.1017/s1539299600016051.

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AbstractThe solar-like oscillations are oscillations that are expected to be excited by near-surface convection. Apart from the Sun itself, we now have a number of stars where p-mode solar-like oscillations have been detected. In this paper we present a short presentation of those recently discovered oscillations.

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Bogorosh, A. T., S. A. Voronov, V. F. Mazanko, I. O. Shmatko, O. A. Shmatko, and A. G. Shayko-Shaikovsky. "INFLUENCE OF MECHANICAL MICRO-DEFECTS ON THE LOCAL POLARIZATION IN DEVICES BASED ON FERROELECTRICS." East European Journal of Physics 3, no. 2 (2016): 15–25. http://dx.doi.org/10.26565/2312-4334-2016-2-02.

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The results of theoretical and experimental studies of the effect of the charged micro-defects on a local reversal in the polarized ferroelectric materials. Domain circuit formation given near the surface of charged defects, the surface temperature distribution of the reaction rate and concentration of solute at the surface of the ferroelectric during enteral studies. The changes of amplitude versus frequency wave oscillations and changes in the rate of reaction in the vicinity of the instability microdefect fluctuations, as well as the evolution of the self-oscillation mode, stable and unstab

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Buffum, D. H., and S. Fleeter. "The Aerodynamics of an Oscillating Cascade in a Compressible Flow Field." Journal of Turbomachinery 112, no. 4 (1990): 759–67. http://dx.doi.org/10.1115/1.2927719.

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Fundamental experiments are performed in the NASA Lewis Research Center Transonic Oscillating Cascade Facility to investigate and quantify the aerodynamics of a cascade of bioconvex airfoils executing torsion mode oscillations at realistic reduced frequency values. Both steady and unsteady airfoil surface pressures are measured at two inlet Mach numbers, 0.65 and 0.80. and two incidence angles, 0 and 7 deg, with the harmonic torsional airfoil cascade oscillations at realistic high reduced frequency and unsteady data obtained at several interbladephase angle values. The time-variant pressures a

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Nguyen, Duc Ngoc, and Tuan Anh Nguyen. "The Dynamic Model and Control Algorithm for the Active Suspension System." Mathematical Problems in Engineering 2023 (February 7, 2023): 1–9. http://dx.doi.org/10.1155/2023/2889435.

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Road surface roughness is the leading cause of vehicle oscillation. The suspension system is used to dampen these oscillations. The active suspension system equipped with a hydraulic actuator is more efficient than the passive one. Therefore, it is used to replace the passive suspension system. The article reviews and analyses models and control algorithms for active suspension systems. In this article, the author mentioned three dynamic models commonly used to simulate vehicle oscillations: a quarter-dynamic model, a half-dynamic model, and a fully dynamic model. Each hydraulic actuator can b

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Omelyanov, Oleg. "EXPERIMENTAL EVALUATION OF ENERGY PARAMETERS OF BULK VIBROSEPARATION OF BULK PRODUCTS." Vibrations in engineering and technology, no. 4(103) (December 24, 2021): 61–67. http://dx.doi.org/10.37128/2306-8744-2021-4-7.

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The article presents the results of experiments to evaluate vibration parameters when using spatial oscillation excitation drive. Among the main directions of the intensification of the vibration technological action during separation of bulk agricultural products, not only the adjustment of amplitude-frequency characteristics can be noted, but also the improvement of the geometric and structural parameters of the drive mechanisms. Currently, in the processes of separation or classification of bulk masses by the method of siting separation, fixed sieves are displaced by sieves receiving an add

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Kumar, Pawan. "Excitation of solar acoustic oscillations." Symposium - International Astronomical Union 181 (1997): 287–305. http://dx.doi.org/10.1017/s0074180900061222.

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The stochastic excitation of solar oscillations due to turbulent convection is reviewed. A number of different observational results that provide test for solar p-mode excitation theories are described. I discuss how well the stochastic excitation theory does in explaining these observations. The location and properties of sources that excite solar p-modes are also described. Finally, I discuss why solar g-modes should be linearly stable, and estimate the surface velocity amplitudes of low degree g-modes assuming that they are stochastically excited by the turbulent convection in the sun.

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Schoof, C., C. A. Rada, N. J. Wilson, G. E. Flowers, and M. Haseloff. "Oscillatory subglacial drainage in the absence of surface melt." Cryosphere 8, no. 3 (2014): 959–76. http://dx.doi.org/10.5194/tc-8-959-2014.

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Abstract. The presence of strong diurnal cycling in basal water pressure records obtained during the melt season is well established for many glaciers. The behaviour of the drainage system outside the melt season is less well understood. Here we present borehole observations from a surge-type valley glacier in the St Elias Mountains, Yukon Territory, Canada. Our data indicate the onset of strongly correlated multi-day oscillations in water pressure in multiple boreholes straddling a main drainage axis, starting several weeks after the disappearance of a dominant diurnal mode in August 2011 and

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Schoof, C., C. A. Rada, N. J. Wilson, G. E. Flowers, and M. Haseloff. "Oscillatory subglacial drainage in the absence of surface melt." Cryosphere Discussions 7, no. 6 (2013): 5613–57. http://dx.doi.org/10.5194/tcd-7-5613-2013.

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Abstract. The presence of strong diurnal cycling in basal water pressure records obtained during the melt season is well-established for many glaciers. The behaviour of the drainage system outside the melt season is less well understood. Here we present borehole observations from a surge-type valley glacier in the St Elias Mountains, Yukon Territory, Canada. These indicate the onset of strongly correlated multi-day oscillations in water pressure in multiple boreholes straddling a main drainage axis, starting several weeks after the disappearance of a dominant diurnal mode in August 2011 and pe

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Li, Liang, Shenhao Chena, Hongtai Wu, and Haitao Cui. "Chaotic, mixed-mode and periodic oscillations during the electro-oxidation of copper in trichloroacetic acid." Journal of the Serbian Chemical Society 69, no. 1 (2004): 33–42. http://dx.doi.org/10.2298/jsc0401033l.

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The current oscillations of a copper electrode in trichloroacetic acid solutions were studied in this paper. The Cu/CCl3COOH system is a new electrochemical oscillator, showing rich dynamic behaviour on two controllable parameters: the trichloroacetic acid concentration (CCCl3COOH) and the imposed potential (E). Phase trajectories were reconstructed from time series using time delaymethods in order that the complex oscillations could be analyzed. Five kinds of oscillations, periodic and quasiperiodic mixed-mode, aperiodic, small amplitude and chaotic current oscillations, were observed. The ED

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Hill, F. "Helioseismic Data Reduction." Symposium - International Astronomical Union 185 (1998): 13–20. http://dx.doi.org/10.1017/s0074180900238187.

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Helioseismology seeks to infer the properties of the solar interior using measurements of the global normal mode oscillations as a function of spherical harmonic degree l, azimuthal order m, and radial order n as observed on the solar surface. The frequencies, v0(l, m, n), of the modes are influenced by the physical conditions of the solar plasma through which the p-mode (pressure) waves propagate, while the power, P(l, m, n), and line widths, Γ(l, m, n), provide clues about the excitation and damping of the oscillations. These mode parameters are extracted from observations of the solar surfa

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42

Latković, Olivera, and Attila Cséki. "Modeling non-radial oscillations on components of close binaries." Proceedings of the International Astronomical Union 9, S301 (2013): 447–48. http://dx.doi.org/10.1017/s1743921313014981.

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AbstractWe developed an advanced binary system model that includes stellar oscillations on one or both stars, with the goal of mode identification by fitting of the photometric light curves. The oscillations are modeled as perturbations of the local surface temperature and the local gravitational potential. In the case of tidally distorted stars, it is assumed that the pulsation axis coincides with the direction connecting the centers of the components rather than with the rotation axis. The mode identification method, originally devised by B. Bíró, is similar to eclipse mapping in that it uti

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Boztepe, Tuğba, Ersin Göğüş, Tolga Güver, and Kai Schwenzer. "Strengthening the bounds on the r-mode amplitude with X-ray observations of millisecond pulsars." Monthly Notices of the Royal Astronomical Society 498, no. 2 (2020): 2734–49. http://dx.doi.org/10.1093/mnras/staa2503.

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ABSTRACT R-mode oscillations have been shown to have a significant potential to constrain the composition of fast spinning neutron stars. Due to their high rotation rates, millisecond pulsars (MSPs) provide a unique platform to constrain the properties of such oscillations, if their surface temperatures can be inferred. We present the results of our investigations of archival X-ray data of a number of MSPs, as well as recent XMM–Newton observations of PSR J1810+1744 and PSR J2241−5236. Using the neutron star atmosphere model and taking into account various uncertainties, we present new bounds

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Enisherlova, Kira L., Lev A. Seidman, Ella M. Temper, and Yuliy A. Kontsevoy. "Effect of PECVD SiNx deposition process parameters on electrical properties of SiNx/AlGaN/GaN structures." Modern Electronic Materials 7, no. 2 (2021): 63–71. http://dx.doi.org/10.3897/j.moem.7.2.73293.

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The effect of parameters of plasma enhanced chemical vapor deposition (PECVD) processes for SiNx film fabrication on the electrical parameters of dielectric/АlGaN/GaN structures has been studied. The effect of growing film composition, additional heterostructure surface treatment with nitrogen plasma before dielectric deposition and HF biasing during treatment on the parameters of the С–V and I–V curves of SiNx/АlGaN/GaN structures has been analyzed. We show that films with nitrogen to silicon concentration ratios of 60 and 40% and a high oxygen content exhibit a decrease in the positive fixed

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Karachevtseva, L. A., M. T. Kartel, Yu I. Sementsov, O. O. Lytvynenko, and O. Yu Sapelnikova. "Hong-Ou-Mandel quantum effect on “expanded graphite - cnts” composites." Himia, Fizika ta Tehnologia Poverhni 14, no. 3 (2023): 387–92. http://dx.doi.org/10.15407/hftp14.03.387.

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We investigated influence of multiwalled carbon nanotubes (CNTs) on spectral characteristics of composites “thermo-expanded graphite – carbon nanotubes (TEG–CNTs)”. The introduction of CNTs in an amount of 0-3% by weight of TEG composites results in a significant increase in the strength characteristics and thermal stability of the composites. This result indicates that CNTs is ideal filler for composites based on TEG compositions and structures. Measurements the giant two-polar oscillations with very small half-width 0.5 cm–1 testify the strong interaction of surface polaritons with photons.

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Ivantsov, Andrey, Tatyana Lyubimova, Grigoriy Khilko, and Dmitry Lyubimov. "The Shape of a Compressible Drop on a Vibrating Solid Plate." Mathematics 11, no. 21 (2023): 4527. http://dx.doi.org/10.3390/math11214527.

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The influence of high-frequency vibrations on the shape of a compressible drop placed on an oscillating solid substrate is studied in this paper. Due to the significant difference in characteristic temporal scales, the average and pulsating motions of the drop can be considered separately. For nearly hemispherical drop, the solution to the problem of pulsating motion is found in the form of series in Legendre polynomials. Frequencies of natural sound oscillations of hemispherical axisymmetric drop are obtained. Resonances of the acoustic mode of drop oscillations are found. The problem of forc

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Zhang, Baiyi, Guobiao Cai, Bijiao He, Kai Zhang, Hongru Zheng, and Weizong Wang. "Plume neutralization of an ionic liquid electrospray thruster: better insights from particle-in-cell modelling." Plasma Sources Science and Technology 30, no. 12 (2021): 125009. http://dx.doi.org/10.1088/1361-6595/ac3e7f.

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Abstract Ionic liquid electrospray thrusters with high specific impulse, high thrust accuracy and low thrust noise are very promising for space gravitational wave detection missions. The plume, which may lead to surface charging of solar panels and sensitive spacecraft components is a great concern for the applications of electrospray thruster. Therefore, this paper investigates the plume neutralization process of the ionic liquid electrospray thruster through fully kinetic particle-in-cell simulations. The unipolarity operation mode is firstly simulated and compared with the experimental meas

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Misra, Sambit, Harry Dankowicz, and Mark R. Paul. "Event-driven feedback tracking and control of tapping-mode atomic force microscopy." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 464, no. 2096 (2008): 2113–33. http://dx.doi.org/10.1098/rspa.2007.0016.

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This paper presents an event-driven, discrete-in-time feedback strategy for tracking and stabilizing naturally occurring periodic oscillations in the probe-tip dynamics of atomic force microscope (AFM) cantilevers in tapping-mode operation. Specifically, robust dynamic tracking and stabilization is achieved by the imposition of discrete changes in the vertical offset between the cantilever support and the sample surface based on an estimated linearization of the system dynamics about a dynamically generated reference trajectory. Here, use is made not only of the oscillation amplitude, as is ty

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Miyama, Toru, Julian P. McCreary, Debasis Sengupta, and Retish Senan. "Dynamics of Biweekly Oscillations in the Equatorial Indian Ocean*." Journal of Physical Oceanography 36, no. 5 (2006): 827–46. http://dx.doi.org/10.1175/jpo2897.1.

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Abstract Variability of the wind field over the equatorial Indian Ocean is spread throughout the intraseasonal (10–60 day) band. In contrast, variability of the near-surface υ field in the eastern, equatorial ocean is concentrated at biweekly frequencies and is largely composed of Yanai waves. The excitation of this biweekly variability is investigated using an oceanic GCM and both analytic and numerical versions of a linear, continuously stratified (LCS) model in which solutions are represented as expansions in baroclinic modes. Solutions are forced by Quick Scatterometer (QuikSCAT) winds (th

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Acosta, Pedro R. "Stability Analysis of a Class of Second Order Sliding Mode Control Including Delay in Input." Mathematical Problems in Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/523527.

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This paper deals with a class of second order sliding mode systems. Based on the derivative of the sliding surface, sufficient conditions are given for stability. However, the discontinuous control signal depend neither on the derivative of sliding surface nor on its estimate. Time delay in control input is also an important issue in sliding mode control for engineering applications. Therefore, also sufficient conditions are given for the time delay size on the discontinuous input signal, so that this class of second order sliding mode systems might have amplitude bounded oscillations. Moreove

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