Gotowe bibliografie tematyczne / Attenuation of pulsation and oscillations

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Gotowa bibliografia na temat „Attenuation of pulsation and oscillations”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Attenuation of pulsation and oscillations"

Zieliński, Dariusz, i Karol Fatyga. "Attenuation of DC-Link Pulsation of a Four-Wire Inverter during Phase Unbalanced Current Operation". Applied Sciences 11, nr 3 (1.02.2021): 1322. http://dx.doi.org/10.3390/app11031322.

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This paper proposes a control algorithm for a hybrid power electronic AC/DC converter for prosumer applications operating under deep phase current asymmetry. The proposed system allows independent control of active and reactive power for each phase of the power converter without current pulsation on the DC link connected to an energy store. The system and its algorithm are based on a three-phase converter in four-wire topology (AC/DC 3p-4w) with two dual-active bridge (DC/DC) converters, interfaced with a supercapacitor and an energy storage. The control algorithm tests were carried out in a Hardware in the Loop environment. Obtained results indicate that operation with deep unbalances and powers of opposite signs in individual phases leads to current oscillations in the DC link. This phenomenon significantly limits energy storage utilization due to safety and durability reasons. The proposed algorithm significantly reduces the level of pulsation in the DC link which increases safety and reduces strain on lithium-ion storage technology, enabling their application in four-wire converter applications.

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Casoli, Paolo, Carlo Maria Vescovini i Massimo Rundo. "One-Dimensional Fluid Dynamic Modeling of a Gas Bladder Hydraulic Damper for Pump Flow Pulsation". Energies 16, nr 8 (11.04.2023): 3368. http://dx.doi.org/10.3390/en16083368.

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Positive displacement pumps produce pressure ripple that can be reduced with the attenuation of the generated flow ripple. This paper presents the application of a gas bladder hydraulic damper with the aim of reducing the oscillations of the delivery flow rate of positive displacement machines. This work is focused on the development of a 1D fluid dynamic model of the damper, which is based on the fundamental fluid motion equations applied for a mono-dimensional flow. In order to represent the fluid flow inside the damper, a particular evaluation of the sound speed has been implemented. Experimental tests have been performed involving an axial piston pump with the damper installed in the delivery pipe to validate the model; tests were carried out at different pump working conditions and with different gas precharge pressure of the damper. The test results confirmed the effectiveness of the device, and the comparison with numerical results demonstrated a good agreement. Simulations have been carried out to investigate the influence of various parameters on damper effectiveness.

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Narayana, Gopalakrishna, i Saravanan Selvaraj. "Attenuation of pulsation and oscillation using a disk at mid-section of spiked blunt body". Physics of Fluids 32, nr 11 (1.11.2020): 116106. http://dx.doi.org/10.1063/5.0024649.

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Ivanov, D. A. "Investigation of the impact of unsteady air flows on the mechanical and operational properties of aircraft structural elements". Civil Aviation High Technologies 26, nr 2 (2.05.2023): 61–71. http://dx.doi.org/10.26467/2079-0619-2023-26-2-61-71.

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The use of pulsating subsonic gas flow treatment (gas pulse treatment) in the process of maintenance and repair for a duration not exceeding a certain value contributes to the restoration and improvement of mechanical and operational properties of aeronautical equipment structural elements. This article presents the results of a study to determine the optimal duration of gaspulse processing of aircraft parts, as which, the duration of processing was adopted, providing the maximum increase in the properties of material viscosity, which prevents crack development without reducing the strength properties. As a result of the study, the influence of various factors, such as the subsonic airflow velocity and the frequency of oscillations, the material and geometric parameters of the processed product, on both the optimal and leading to a decrease in mechanical properties duration of processing by pulsating airflow of aircraft structural elements during maintenance and repair, was evaluated. It has been established that mechanical waves generated by gas flow pulsations can have a significant impact on the structural strength of aircraft structural elements, which makes it possible to increase their reliability as well as the accuracy of forecasting the technical condition. The harmonic nature of the attenuation of the ratio of residual stresses to their initial values has been experimentally established, depending on the duration of gas pulse treatment, which allows us to control their magnitude and sign. An empirical formula has been obtained to determine the optimal processing time for products of various materials. As an indicator of the duration of gas pulse treatment, an increase in the viscosity of the material was adopted without reducing the strength properties. Graphical dependences of the relative time of gas pulse processing, which provides an increase in the mechanical properties of the relative frequency of the gas flow oscillations, have been constructed.

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Kateryna, Deineka. "INFLUENCE OF SMALL FRACTION OF POLYGRANULAR FILL OF ROTATING DRUM ON SELF-OSCILLATION SWING". Vibrations in engineering and technology, nr 4(95) (20.12.2019): 31–37. http://dx.doi.org/10.37128/2306-8744-2019-4-4.

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The influence of the structure of two-fractional polygranular fill of a rotating drum on the self-oscillation swing is considered. The pulsating mode of flow of such intrachamber fill is used in the self-oscillating grinding process in a tumbling mill. Spherical particles of non-coherent granular material of 2.2 mm size were used as a large fraction modeling the grinding bodies. Cement was used as the small fraction modeling the particles of the crushed material. The factors of experimental studies were accepted: the gaps between particles of large fraction degree of filling at rest dispersed particles of small fraction 0, 25, 50 and 100%, the relative size of particles of large fraction in the drum chamber 0.519, 0.733, 1.04, 1.47, 2.08, 2.93, 4.15 and 5.87% (drum chamber radius 212, 150, 106, 75, 53, 37.5, 26.5 and 18.75 mm), the chamber degree of filling at rest 25, 35 and 45%. The method of visual analysis of fill motion patterns in the cross section of a rotating chamber and measurement of dilatation was applied.Video of the fill pulsating flow was taken. The magnitude of the self-oscillation swing was estimated by the increase in the difference of the maximum and minimum values of the fill dilatation over one period of pulsating. The maximum range of self-oscillation swing reached the value of 1.36. The change of the self-oscillation swing from zero at the beginning of self-excitation of pulsations to the maximum value with the greatest increase of dilatation was revealed. The effect of a decrease in the maximum range of self-oscillation swing with enhanced fill coherent properties has been registered. The attenuation of the spray of particles of large fraction in the chamber due to the coherent effect of the small fraction was established. An increase in the self-oscillation swing of single-grain fill was found with a decrease in the relative particle size and the chamber degree of filling. A decrease in the self-oscillation swing of two-fractional fill was found with an increase in the content of small fraction, a decrease in the relative size of particles of a large fraction, and an increase in the chamber degree of filling.

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Fang, Zhenlong, Qiang Wu, Mengda Zhang, Haoyang Liu, Pan Jiang i Deng Li. "Large Eddy Simulation of Self-Excited Oscillation Pulsed Jet (SEOPJ) Induced by a Helmholtz Oscillator in Underground Mining". Energies 12, nr 11 (5.06.2019): 2161. http://dx.doi.org/10.3390/en12112161.

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Pulsed waterjet can break rocks effectively by taking advantage of the water hammer effect, and is thus widely used in mining, petroleum, and natural gas fields. With the aim to further clarify the flow field characteristics of pulsed jets induced by a Helmholtz oscillator, large eddy simulation was conducted under different operating pressures. The velocity distribution, mean flow field, and the coherent structure were examined using the oscillators of different cavity lengths and diameters. The results clearly showed that the major frequency of jet pulsation gradually increased with the increase of operating pressure. A stable periodic velocity core was formed at the outlet of the Helmholtz oscillator, while the external flow field was subjected to periodic impact. As a result, the ambient fluid was strongly entrained into the jet beam. With the increase of the cavity length, the length of the core segment decreased while the energy loss caused by the cavity increased, which was also accompanied by a rapid attenuation of the axial velocity at the jet outlet. The coherent structure of the jet in the oscillator with small cavity diameter was more disordered near the nozzle outlet, and the vortex scale was larger. The effect of cavity diameter can be reflected in the feedback modulation of the jet in the cavity. Compared with the conical nozzle, the length of the core section of the jet was shorter, but the jet had better bunching, a smaller diffusion angle, and better mixing performance. These results provide a further understanding of the characteristics of pulsed water jet for better utilizations in the fields of energy exploitation.

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Song, Soon H., Susan S. McIntyre, Hasnain Shah, Johannes D. Veldhuis, Peter C. Hayes i Peter C. Butler. "Direct Measurement of Pulsatile Insulin Secretion from the Portal Vein in Human Subjects1". Journal of Clinical Endocrinology & Metabolism 85, nr 12 (1.12.2000): 4491–99. http://dx.doi.org/10.1210/jcem.85.12.7043.

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Insulin is secreted in a high frequency pulsatile manner. These pulses are delivered directly into the portal vein and then undergo extraction and dilution before delivery into the systemic circulation. The reported frequency of these insulin pulses estimated in peripheral blood varies from an interpulse interval of 4–20 min. We postulated that this discrepancy is due to the attenuation of the pulse signal in the systemic circulation vs. the portal circulation. In the present study we measured pulsatile insulin release directly in the portal circulation of human subjects who had indwelling transjugular intrahepatic portasystemic stent shunts (TIPSS) to decompress portal hypertension. We quantitated pulsatile insulin secretion in both the overnight fasted state (fasting) and during a hyperglycemic clamp (8 mmol/L). Direct portal vein sampling established that pulsatile insulin secretion in humans has an interval (periodicity) of approximately 5 min. The amplitude (and mass) of the insulin concentration oscillations observed in the portal vein was approximately 5-fold greater than that observed in the arterialized vein and was similar to that observed in the dog. Increased insulin release during hyperglycemia was achieved through amplification of the insulin pulse mass. In conclusion, direct portal vein sampling in humans revealed that the interpulse interval of insulin pulses in humans is about 5 min, and this frequency is also observed when sampling from the systemic circulation using a highly specific insulin assay and 1-min sampling, but is about 4-fold greater than the frequency observed at this site using single site RIAs. We confirm that enhanced insulin release in response to hyperglycemia is achieved by amplification of these high frequency pulses.

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Yuan, Jun, Hang Jiang, Zheng-yan Fang, Tian-sheng Wang, Zhi Luo, Feng-xian Jiang i Gui-hong Yin. "Design and Characteristic Analysis of a New Type of Hydraulic Pulsation Suppressor". E3S Web of Conferences 293 (2021): 02028. http://dx.doi.org/10.1051/e3sconf/202129302028.

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In order to decrease the pressure pulsation of high-pressure hydraulic system and speed up the process of high-pressure hydraulic system, a new type of hydraulic pulsation suppressor is designed. The hydraulic pulsation suppressor is designed on the basis of the structural characteristics and attenuation performance of the expansion chamber attenuator and H-type muffler. The theoretical model of the modern hydraulic pulsation suppressor is established based on the fluid theory, and the attenuation performance of the new hydraulic pulsation suppressor is analyzed. The results demonstrate that the designed new hydraulic pulsation suppressor can attenuate the pressure pulsation with a pulsation frequency of 20 Hz～2000 Hz, and attenuate the frequency bandwidth; the attenuation effect is above 50dB, and the attenuation effect is ideal.

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Zhou, Shenghao, Hangyu Jiao, Dongxu Liu, Weizhen Liu, Junzhe Lin, Qingkai Han i Zhong Luo. "Numerical and Experimental Analysis of Pressure Pulsation Attenuator Based on Helmholtz Resonator". Applied Sciences 13, nr 14 (20.07.2023): 8381. http://dx.doi.org/10.3390/app13148381.

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Due to the development of aviation hydraulic systems towards high pressure and high flow, the frequency range of pressure pulsation becomes wider, and the amplitude of pulsation increases. This puts higher requirements on the attenuation characteristics of the pressure pulsation attenuator. To reduce the damage caused by pressure pulsation to the pipeline, a Helmholtz-type pulsation attenuator (HTPA) is designed, which works through the Helmholtz resonant chamber. The theoretical model of HTPA is established by the method of lumped parameter method and distribution parametric method. The insertion loss is adopted to evaluate its attenuation characteristics. The internal pressure dynamic characteristics and attenuation effect of the HTPA are analyzed by simulation and experimentation. The results show that the pulsation attenuation rate δ was 40% after the installation of the attenuator. In the frequency range of 0–1000 Hz, the maximum insertion loss is 19 dB, which verifies the validity and correctness of the theoretical model.

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Shang, Yaoxing, Hong Tang, Huawang Sun, Changbin Guan, Shuai Wu, Yuanzhi Xu i Zongxia Jiao. "A novel hydraulic pulsation reduction component based on discharge and suction self-oscillation: Principle, design and experiment". Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, nr 4 (4.09.2019): 433–45. http://dx.doi.org/10.1177/0959651819871775.

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The reduction of fluid ripple in pipes is extremely important for the reliability and safety of aircrafts and ships. Currently, most researches only pay attention to the discharge port and ignore the suction port and the inherent characteristic of the axial pump between both ports, which may cause significant underestimation of fluid ripple especially in the closed-loop hydraulic system. Therefore, the aim of this study is to propose a novel passive fluid ripple attenuator, which can simultaneously reduce discharge and suction pulsation of the axial-piston pump, and adapt to the condition of frequent change of load reversing in closed hydraulic system. First, the phase matching rule is discovered between discharge and suction ripple, and then based on that, the proposed discharge and suction self-oscillation principle is verified through simulation on the phase relationship of the pump internal pistons, instead of considering the two separately as before. The attenuator designed with the concept of the discharge and suction self-oscillation principle is presented, and models of how ripple generates and the attenuator works are represented analytically. The corresponding simulation model is established, and the result indicates that the ripple of both ports of the piston pump is weakened significantly. Moreover, one testing platform is developed, and the experimental study is conducted on the discharge and suction ripple. It proves that the proposed attenuator based on discharge and suction self-oscillation principle can reduce the fluid ripple effectively.

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Rozprawy doktorskie na temat "Attenuation of pulsation and oscillations"

Domiciano, de Souza Armando. "Modélisation et observation en interférométrie stellaire : rotation, pulsation et taches". Nice, 2003. https://tel.archives-ouvertes.fr/tel-01417070.

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Dans ce mémoire j’expose mes recherches et résultats sur certains mécanismes qui régissent l’évolution stellaire, en particulier la rotation, la pulsation et l’activité stellaire. Pour cela, j’ai développé un outil de modélisation dédiée à l’Interférométrie Optique à Longue Base (OLBI) combinée à la haute résolution spectrale. Ce modèle m’a permis d’étudier la morphologie et l’assombrissement gravitationnel des étoiles tournant proche de leur vitesse critique. J’ai pu ainsi préparer, analyser et interpréter des observations en interférométrie IR sur VLTI-VINCI Un résultat marquant et unique est la mesure directe de l’aplatissement de l’étoile Be Achernar montrant un rayon équatorial -50% fois plus grand que le rayon polaire, en première approximation. Cet aplatissement se situant sans équivoque au niveau de la photosphère, j’ai pu conclure que l’approximation de Roche ne permet pas d’expliquer nos observations. La rotation différentielle est l’hypothèse alternative proposée, avec de multiples conséquences, entre autres sur le transport et sur la perte du moment angulaire et de la masse. Ce travail a motivé une étude théorique de la rotation différentielle par la spectro-interférométrie, sur VLTI-AMBER notamment, où je démontre que la transformée de Fourier des profils de photocentre permet de déterminer le taux de rotation différentielle et l’orientation 3D de l’axe de rotation stellaire. Pour terminer, je présente quelques études prospectives sur la mesure, par OLBI, de diverses formes d’inhomogénéités de surface à partir de la phase des visibilités complexes ou de l’imagerie directe par des réseaux de télescopes, en passant par l’imagerie Doppler interférométrique
I present here my thesis researches and results on some mechanisms that govern stellar evolution, in particular rotation, pulsation and stellar activity. For this purpose I developed a numerical model oriented to Optical Long Baseline Interferometry (OLBI) combined to high spectral resolution. Thanks to this model I studied the morphology and the gravity darkening of stars rotating close to their critical velocity. I could then prepare, analyse and interpret our IR Interferometric observations on VLTI-VINCI. A major and unique result is the direct measure of the oblateness of the Be star Achernar, which shows an equatorial radius -50% larger than the polar one, in first approximation. This flattening comes certainly from the photosphere so that I could conclude that the Roche approximation cannot explain our observations. Differential rotation is the proposed alternative hypothesis, with multiple consequences on the transport and loss of the mass and angular momentum. This work motivated a spectro-interferometric study of the differential rotation, notably for VLTI-AMBER, where I show rate and the 3D orientation of the stellar rotation axis. Finally, I present a few prospective studies concerning the measure, by OBLI, of several kinds of surface inhomogeneities through complex visibility phases, direct imaging by telescope networks, as well as through interferometric Doppler imaging

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Dragset, Siri Garli. "Attenuation of Heave-Induced Pressure Oscillations in MPD". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26098.

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The purpose of this thesis is to discuss and perform down-hole pressure management in the well while drilling from a floating rig throughout a pipe connection. Managed Pressure Drilling (MPD) technology has proven successful when drilling from stationary rigs, yet the technology is not used in floaters due to a heave motion caused by waves. It is desirable to retain a constant fluid pressure to prevent well collapses or fractures, which may pose a risk to the employees as well as the environment. In addition, damaged equipment may lead to excessive expenses and production restrictions. First, a gray-box model to describe the dynamics in the well is derived. As opposed to prior work on the subject, pressure measurements along the drill-string are assumed known and used in the model. The number of measurements in the model identification exceeds the mathematical order of the optimal model of the process. This raises questions concerning over-parameterization. Over-parametrization leads to unnecessary computational load, which should be avoided. Further, a Model Predictive Controller (MPC) is developed to control the fluid pressure. In order to verify the MPC performance, experiments in three different stages were conducted. Stage 1 was nominal experiments, stage 2 was tests against the Managed Pressure Drilling (MPD) Simulator, and the final stage was tests in the IPT Heave Lab. In the nominal tests, the disturbance was suppressed as much as 80\%. Simulator experiments showed positive results as well, and suppressed disturbances from waves with a period of 3 seconds, which is the assumed worst-case scenario, by 63\%. The experiments in the IPT Heave Lab were not conducted as planned, thus it was inexpedient to compare the performance to earlier work on the matter. The disturbance is not observable in practical applications. Thus, it is necessary to predict future disturbances in order for the MPC to account for this. A predictor was implemented based on known down-hole dynamics and it demonstrated good performance in the simulator. Poor performance of the observer in the lab indicated that the parameters in the dynamic equations were not tuned to describe the lab dynamics.

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Gallenne, Alexandre. "Les céphéides à haute résolution angulaire : enveloppe circumstellaire et pulsation". Paris 6, 2011. http://www.theses.fr/2011PA066496.

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Hu, Tianxiang. "Attenuation of self-induced roll oscillations of low-aspect-ratio wings". Thesis, University of Bath, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619294.

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Micro Air Vehicles are currently receiving growing interest because of their broad applications in many fields. However, in MA V flight tests, the onset of unwanted large-amplitude roll oscillations for various designs has been reported, which has eventually led to difficulties in flight control and such undesirable selfinduced roll oscillations were investigated in the current study. More specifically, a common low-aspect-ratio wing, an AR = 2 rectangular flat plate, was researched, with the aim being to attenuate the self-induced roll oscillation of low-aspect-ratio wings by applying various flow control techniques. These flow control techniques were applied using in three completely different approaches using three different flow control techniques, i) global active excitation, ii) local active excitation and iii) passive flow control. The global active excitation was achieved by using external acoustic forcing and it is found that the self-induced roll oscillations of AR = 2 flat plate wing can be completely suppressed as well as the onset of the roll oscillations delayed using this method. Similar results were also obtained for wings with airfoil profiles of NACA0012 and SD7003-085-88. In addition, the velocity measurements indicated that acoustic excitation could restore a symmetric vortex flow over the free-to-roll wings and thus eliminate the self-induced roll oscillations. Frequency spectral study revealed that acoustic excitation could energize the shear layer instabilities and result in reattachment or a smaller separated flow region over the suction surface of the wings, thereby, attenuating the roll oscillations.

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Neiner, Coralie Laurence. "Pulsation, rotation, wind and magnétic field in early B-type stars". Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13012.

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Lotz, Stefanus Ignatius. "Empirical modelling of the solar wind influence on Pc3 pulsation activity". Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005249.

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Geomagnetic pulsations are ultra-low frequency (ULF) oscillations of the geomagnetic field that have been observed in the magnetosphere and on the Earth since the 1800’s. In the 1960’s in situ observations of the solar wind suggested that the source of pulsation activity must lie beyond the magnetosphere. In this work the influence of several solar wind plasma and interplanetary magnetic field (IMF) parameters on Pc3 pulsations are studied. Pc3 pulsations are a class of geomagnetic pulsations with frequency ranging between 22 and 100 mHz. A large dataset of solar wind and pulsation measurements is employed to develop two empirical models capable of predicting the Pc3 index (an indication of Pc3 intensity) at one hour and five minute time resolution, respectively. The models are based on artificial neural networks, due to their ability to model highly non-linear interactions between dependent and independent variables. A robust, iterative process is followed to find and rank the set of solar wind input parameters that optimally predict Pc3 activity. According to the parameter selection process the input parameters to the low resolution model (1 hour data) are, in order of importance, solar wind speed, a pair of time-based parameters, dynamic solar wind pressure, and the IMF orientation with respect to the Sun-Earth line (i.e. the cone angle). Input parameters to the high resolution model (5 minute data) are solar wind speed, cone angle, solar wind density and a pair of time-based parameters. Both models accurately predict Pc3 intensity from unseen solar wind data. It is observed that Pc3 activity ceases when the density in the solar wind is very low, even while other conditions are favourable for the generation and propagation of ULF waves. The influence that solar wind density has on Pc3 activity is studied by analysing six years of solar wind and Pc3 measurements at one minute resolution. It is suggested that the pause in Pc3 activity occurs due to two reasons: Firstly, the ULF waves that are generated in the region upstream of the bow shock does not grow efficiently if the solar wind density is very low; and secondly, waves that are generated cannot be convected into the magnetosphere because of the low Mach number of the solar wind plasma due to the decreased density.

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Todoeschuck, John 1955. "Non-linear seismic attenuation in the earth as applied to the free oscillations". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72760.

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Wright, Duncan John. "Spectroscopic mode identification in a sample of non-radially pulsating stars". Thesis, University of Canterbury. Physics and Astronomy, 2008. http://hdl.handle.net/10092/1524.

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This thesis has analysed spectroscopic data for three stars in detail, the β Cephei star V2052 Ophiuchus, the γ Doradus star QW Puppis and the γ Doradus candidate star HD139095. Twelve other candidate γ Doradus stars have had their Vrotsin i, binary status and, where possible, the presence of line profile variation determined. A new technique utilising scaled delta functions has been developed to allow the extraction of a single, high S/N line profile from a high resolution and large wavelength range spectrum. This procedure has performed well in the γ Doradus stars examined. The application of the new mode identification technique, the Fourier Parameter Fit method, to the three stars examined in detail has been very successful. For each of the three stars constraints have been placed on the degree (l) and the azimuthal order (m) of the non-radial pulsation modes detected.

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Rao, Manoj. "Thermo-hydrodynamics of an extended meniscus as unit-cell approach of pulsating heat pipe". Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0080/document.

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Ce travail fait une tentative pour expliquer les oscillations induites thermiquement auto-entretenue d'un système à deux phases constitué d'un liquide-vapeur confinée ménisque isolé (un bouchon de liquide unique attenant à une bulle de vapeur) à l'intérieur d'un tube capillaire circulaire, la longueur du tube être exposé à un gradient de température net, créant ainsi un cycle continu de l'évaporation et la condensation. Ce système représente la simple « unité-cellule" version d'un caloduc oscillant (PHP). La compréhension fondamentale de son comportement de transport menant à oscillations auto-soutenue est essentielle pour la construction des modèles mathématiques jusque-là inexistants du système PHP complet. Tout d'abord, la visualisation des oscillations de l'unité de cellules a été effectuée dans des conditions aux limites thermiques contrôlées. Ici, une compréhension nouvelle et unique de la dynamique du système a été atteint par une synchronisation en temps réel de la mesure de pression interne avec la vidéographie haute vitesse qui a été utilisé pour visualiser et enregistrer les oscillations du ménisque et le mince film de liquide qui est mis sur le mur lorsque le ménisque quitte l'évaporateur. Un modèle numérique a été développé pour le système constitué par un bouchon de vapeur et un bouchon de liquide oscillant dans un tube fermé à une extrémité et relié à un réservoir à une pression constante à l'autre extrémité. Le principe de modélisation avait été posé lors de travaux antérieurs. Quelques modifications ont été jamais moins introduites dans ce travail pour prendre en compte les particularités de la nouvelle expérimental et pour améliorer le liquide modèle film de l'évaporation à la lumière des résultats expérimentaux. Une étude paramétrique a également été réalisée pour comprendre les implications des différents facteurs sur le fonctionnement d'un tel système
This work makes an attempt to explain the self-sustained thermally-induced oscillations of a two-phase system consisting of an isolated confined liquid–vapour meniscus (a single liquid plug adjoining a vapour bubble) inside a circular capillary tube, the tube length being exposed to a net temperature gradient, thereby creating a continuous cycle of evaporation and condensation. This system represents the simplest ‘unit-cell’ version of a Pulsating Heat Pipe (PHP). The fundamental understanding of its transport behavior leading to self-sustained oscillations is vital for building the hitherto non-existent mathematical models of the complete PHP system. First, visualization of the oscillations of the unit-cell has been done under controlled thermal boundary conditions. Here, a unique and novel understanding of the system dynamics has been achieved by real-time synchronization of the internal pressure measurement with high-speed videography that was used to visualize and record the meniscus oscillations and the thin liquid film that is laid on the wall when the meniscus leaves the evaporator. A numerical model was developed for the system consisting of a vapour plug and a liquid slug oscillating in a tube closed at one end and connected to a reservoir at a constant pressure at the other end. The modeling principle had been posed in previous work. Some modifications were never the less introduced in this work to take into account the peculiarities of the new experimental set-up and to improve the liquid film evaporation model in the light of the experimental results. Also a parametric study was carried out to understand the implications of the various factors on the working of such system

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Borgomano, Jan. "Dispersion des modules élastiques de carbonates saturés : étude expérimentale et modélisation". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE021/document.

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Pour les roches saturées, la comparaison entre les mesures ultrasoniques (1 MHz) au laboratoire et les mesures sismiques (100 Hz) ou de diagraphie (10 kHz) sur le terrain n’est pas directe à cause de la dispersion des vitesses des ondes. Les mécanismes impliqués dans la dépendance en fréquence sont les écoulements de fluides à différentes échelles provoqués par le passage de l’onde. La dispersion et l’atténuation des modules élastiques de roches carbonatées ont été étudiées expérimentalement. Les calcaires étudiés sont : un Lavoux, un Indiana intact et craqué thermiquement, un calcaire Urgonien de Provence (Rustrel), et un coquina pré-sel du Congo. Les mesures ont été faites sur une large gamme de fréquence, en combinant les techniques d’oscillations forcées (10-3 to 102 Hz) et ultrasoniques (1 MHz) dans une presse triaxiale, pour différentes pressions effectives. Le forçage peut être hydrostatique pour mesurer un module d’incompressibilité, ou axial pour mesurer le module de Young et le coefficient de Poisson. Pour étudier l’effet de la viscosité, les mesures ont été faites en condition sèche, puis saturée en glycérine et en eau. Le drainage global et le mécanisme d’écoulement crack-pore ont été caractérisés, en termes d’amplitude de dispersion, d’atténuation viscoélastique, et de fréquence de coupure. Pour nos échantillons, la théorie de Biot-Gassmann s’est montrée valide pour les fréquences sismiques (10-100 Hz) sauf pour l’Indiana craqué thermiquement. La dispersion liée à des écoulements crackspores a été observée pour tous les échantillons sauf le Lavoux. Les fréquences de coupures de ceux-ci sont toutes dans la gamme des fréquences des diagraphies (10 kHz) pour des conditions de saturation en eau. Un modèle simple, combinant poroélasticité et milieux effectifs, a été développé pour prédire la dispersion des modules sur toute la gamme de fréquence, et s’est montré généralement en accord avec les résultats expérimentaux
For fluid-saturated rocks, comparing ultrasonic measurements (1 MHz) in the laboratory and seismic (100 Hz) or logging (10 kHz) measurements in the field is not straightforward due to dispersion of the bodywave velocities. The frequency-dependent mechanisms involved are wave-induced fluid flows that occur at different scales. The dispersion and the attenuation of the elastic moduli of four fluid-saturated carbonate rocks have been studied experimentally. The selected limestones were a Lavoux, an intact and thermally cracked Indiana, a Urgonian limestone from Provence (Rustrel), and a presalt coquina from offshore Congo. Measurements were done over a large frequency range, by the combination of forced oscillations (10-3 to 102 Hz) and ultrasonic measurements (1 MHz) in a triaxial cell, at various effective pressures. The forced oscillations were either hydrostatic to deduce the bulk modulus, or axial to deduce Young’s modulus and Poisson’s ratio. The measurements were done in dry-, glycerinand water-saturated conditions to investigate the effect of viscosity. For all our samples, the global drainage and the squirt-flow mechanisms were characterized experimentally, in terms of amplitude of dispersion, amount of viscoelastic attenuation, and cut-off frequencies. Biot- Gassmann’s theory was found to be valid at seismic frequencies (10-100 Hz) for all the samples except the thermally cracked Indiana. Squirt-flow transitions were observed for all the samples, except the Lavoux. The cut-off frequencies were all in the range of logging frequencies (10 kHz), for watersaturated conditions. A simple model, combining poroelasticity and the noninteraction approximation effective medium, was developed to predict the dispersion of the moduli over the whole frequency range, and was generally in agreement with the experimental results

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Książki na temat "Attenuation of pulsation and oscillations"

M, Takeuti, i Sasselov Dimitar D, red. Stellar pulsation: Nonlinear studies. Dordrecht: Kluwer Academic Publishers, 2001.

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Takeuti, Mine. Stellar Pulsation - Nonlinear Studies. Dordrecht: Springer Netherlands, 2001.

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Carla, Cacciari, i Clementini Gisella, red. Confrontation between stellar pulsation and evolution. San Francisco, Calif: Astronomical Society of the Pacific, 1990.

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IAU, Colloquium (155th 1995 Cape Town South Africa). Astrophysical applications of stellar pulsation: Proceedings of IAU colloquium 155, held in Cape Town, 6-10 February 1995. San Francisco: Astronomical Society of the Pacific, 1995.

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A, Guzik J., Bradley P. A i Institute for Geophysics and Planetary Physics at Los Alamos., red. Stellar pulsation: Challenges for theory and observation : proceedings of the international conference, Santa Fe, New Mexico, 31 May-5 June 2009. Melville, N.Y: American Institute of Physics, 2009.

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R, Stalio, Willson L. A i Trieste Workshop on Stellar Pulsation and Mass Loss (1987), red. Pulsation and mass loss in stars: Proceedings of a workshop, held in Trieste, Italy, September 14-18, 1987. Dordrecht: Kluwer Academic Publishers, 1988.

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1953-, Nemec James Michael, i Matthews Jaymie M, red. New perspectives on stellar pulsation and pulsating variable stars: Proceedings of IAU Colloquium no. 139, Victoria, British Columbia, 15-18, July 1992. Cambridge: Cambridge University Press, 1993.

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P, Cox John, Cox Arthur N, Sparks Warren Morgan 1939- i Starrfield S. G. 1940-, red. Stellar pulsation: Proceedings of a conference held as a memorial to John P. Cox at the Los Alamos National Laboratory, Los Alamos, New Mexico, USA, August 11-15, 1986. Berlin: Springer-Verlag, 1987.

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Cox, John P. Theory of Stellar Pulsation. Princeton University Press, 2017.

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Cox, John P. Theory of Stellar Pulsation. Princeton University Press, 2017.

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Części książek na temat "Attenuation of pulsation and oscillations"

Deubner, Franz-Ludwig. "Observations of Solar Oscillations". W Pulsation and Mass Loss in Stars, 163–79. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3029-2_10.

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Hummel, W., i R. W. Hanuschik. "Global Disk Oscillations: Theoretical Line Profiles". W Pulsation, Rotation and Mass Loss in Early-Type Stars, 382–83. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1030-3_109.

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Paterno, Lucio. "Solar and Stellar Nonradial Oscillations, Wave Propagation and Heating of the Upper Atmosphere". W Pulsation and Mass Loss in Stars, 181–206. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3029-2_11.

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Hanuschik, R. W., W. Hummel, O. Dietle, J. Dachs i E. Sutorius. "Global Oscillations in Be Star Envelopes: Observational Evidence". W Pulsation, Rotation and Mass Loss in Early-Type Stars, 384–85. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1030-3_110.

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Pamyatnykh, A. A., W. A. Dziembowski, P. Moskalik i M. J. Seaton. "OP Versus OPAL Opacities: Consequences for B Star Oscillations". W Pulsation, Rotation and Mass Loss in Early-Type Stars, 70–72. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1030-3_23.

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"Solar-like oscillations in stars". W Challenges In Stellar Pulsation, redaktor Luis A. Balona, 145–68. BENTHAM SCIENCE PUBLISHERS, 2012. http://dx.doi.org/10.2174/978160805185411001010145.

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Frehner, Marcel, Holger Steeb i Stefan M. "Wave Velocity Dispersion and Attenuation in Media Exhibiting Internal Oscillations". W Wave Propagation in Materials for Modern Applications. InTech, 2010. http://dx.doi.org/10.5772/6866.

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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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Boothroyd, Andrew T. "Neutron Optics". W Principles of Neutron Scattering from Condensed Matter, 311–42. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862314.003.0009.

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The description of neutron optical phenomena within the framework of dynamical diffraction theory is described. The coherent wave and optical potential are introduced, and an expression for the complex neutron refractive index in terms of the scattering length density and attenuation coefficient is obtained. The extension to magnetic media and polarized neutrons is covered. Neutron reflectivity is defined, and the wavevector dependence of the reflectivity profile is derived by a transfer matrix method and an optical method. Exact results are compared with the Born approximation. The technique of neutron imaging is described, including neutron radiography and computed tomography. Several optical phenomena that occur in Bragg diffraction from near-perfect crystals, including Pendellösung oscillations, and primary and secondary extinction.

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Tsarouchas, Nick. "Clinical Neurophysiology of Epileptogenic Networks". W Neurophysiology - Networks, Plasticity, Pathophysiology, and Behavior [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104952.

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Current theories and models of brain rhythm generation are based on (1) the excitability of individual neurons and whole networks, (2) the structural and functional connectivity of neuronal ensembles, (3) the dynamic interaction of excitatory and inhibitory network components, and (4) the importance of transient local and global states. From the interplay of the above, systemic network properties arise which account for activity overdrive or suppression, and critical-level synchronization. Under certain conditions or states, small-to-large scale neuronal networks can be entrained into excessive and/or hypersynchronous electrical brain activity (epileptogenesis). In this chapter we demonstrate with artificial neuronal network simulations how physiological brain oscillations (delta, theta, alpha, beta and gamma range, and transients thereof, including sleep spindles and larger sleep waves) are generated and how epileptiform phenomena can potentially emerge, as observed at a macroscopic scale on scalp and intracranial EEG recordings or manifested with focal and generalized, aware and unaware, motor and nonmotor or absence seizures in man. Fast oscillations, ripples and sharp waves, spike and slow wave discharges, sharp and rhythmical slow waves, paroxysmal depolarization and DC shifts or attenuation and electrodecremental responses seem to underlie key mechanisms of epileptogenesis across different scales of neural organization and bear clinical implications for the pharmacological and surgical treatment of the various types of epilepsy.

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Streszczenia konferencji na temat "Attenuation of pulsation and oscillations"

Olayiwola, Bolaji O., i Peter Walzel. "Efficient Heat Transfer in a Laminar Flow System by Hydrodynamic Manipulation". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11187.

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The effects of flow manipulation on the heat transfer performance of a laminar flow system were investigated. The combination of series of fins and oscillating flow was used due to its inherent advantage of triggering very complex transient interaction of eddies and flow deflection within the system. The investigations were performed with fluids providing Prandtl numbers Pr > 10. Steady Reynolds number in the range of 50 < Re < 1200 were studied. The duct with a hydraulic diameter Dh = 15 mm contains series of non-conducting fins. All geometrical parameters remain constant. Low frequency oscillation f < 100 Hz was used in order to obtain oscillation effects mainly dominated by oscillation velocity, and to avoid attenuation of the oscillation amplitude A in the device. Based on the experimental data, a correlation equation was developed. The energy dissipation as a result of applied oscillation was also determined by phase resolved measurements of the pressure difference and liquid displacement. The heat transfer coefficients were found to be dynamically controlled by the oscillations. The results show efficient heat transfer within the system due to the applied oscillation especially at low flow rates. At higher flow rates, the effect of the flow oscillation on the heat transfer performance of the system diminishes. With oscillating finned flow, the influence of the geometrical parameter Dh/L is not significant due to enhanced fluid mixing and repeated thermal boundary layer rearrangement as a result of the flow oscillation. The predictions of the correlation are reasonable. The results of the CFD show that for the fin spacing to be significant on the effectiveness of the finned system, the oscillating flow velocity must be higher than the mean flow velocity. Enhanced heat transfer performance is possible with increasing fin height but theoretically, this yields high pressure drop and increased pumping power. The calculated power input due to oscillation is comparatively low and decreases towards increasing net flow rates where the pulsating flow has a diminishing effect and the system approaches non-pulsating flow behaviour.

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Linck, Martin B., Michael D. Armani i Ashwani K. Gupta. "Effect of Swirl and Fuel Pulsation on Flow Dynamics, Flame Structure and Droplet Motion in Swirl-Stabilized Spray Flames". W ASME 2004 Power Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/power2004-52048.

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This paper describes an experimental investigation of the role of swirl distribution in a co-annular swirl-stabilized spray combustor for passive control of flame structure using kerosene fuel. Three distinctly different flames have been examined. A low shear, a high shear, and a counter-rotating swirling flow flame have been examined. The droplet dynamics and flowfield associated with the low and high shear co-rotating swirl configurations under isothermal and combustion conditions have been examined using a phase Doppler interferometric techniques. The high-shear swirl configuration was found to decrease droplet diameter in the shear region, indicating secondary atomization of larger size droplets due to strong shear effects in the flow. Droplet mean and turbulence characteristics were obtained. In order to simulate oscillations in the flow pulsations were introduced into the fuel flow in order to excite instabilities in the burner. The role of swirl distribution was determined on the attenuation of this imposed instability. Swirl distribution was found to be effective in reducing the instability. Instabilities at the forcing and harmonic frequencies are found to be up to 5 dB more powerful in the counter-rotating flow, demonstrating the role of swirl on flame structure and the associated combustion instability in swirl-stabilized spray combustors. The airflow distribution in the burner was also found to play an important role on the alleviation of combustion instability.

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Yi, Tongxun, Ephraim J. Gutmark i Michael Cornwell. "Characteristics and Control of an Unstable Liquid-Fueled Multi-Swirling Combustor". W ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-69020.

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This paper reports our initial results on active control of combustion instability in a lean direct fuel injection combustor featured with multiple air swirls and distributed fuel injection. Fuel modulation is achieved by “pushing” fuel out of the valve cavity using a magnetostrictive rod that extends or contracts with unsteady currents going through its surrounding coil. To follow the flow commands and quickly reject exogenous disturbances on mean fuel flow rate, an LQG pulse-width modulation controller based on system identification models is developed. As a starting point, we tried a phase shift controller whose optimal control phase is directly obtained from system identification models. Pressure attenuation up to 20 dB is achieved within 150 ms using pressure feedback that achieves more pressure attenuation than optical fiber feedback. It is found that, during unstable combustions, pressure has a higher signal noise ratio than the optical fiber output mainly because the thermoacoustic system has a high gain around its resonant frequencies. Time-varying phase relationship exists between heat release and pressure. Partial blockage of the combustor exit considerably reduces combustion oscillation intensity and postpones the occurrence of unstable combustion to a higher equivalence ratio. This may be because the exit blockage increases the acoustic impedance at the combustor exit and modifies the reacting flow field. With higher preheat temperature, strong combustion oscillations may occur at a lower equivalence ratio. Pressure pulsations may exhibit hysterisis with equivalence ratio, especially at lower preheat temperature.

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Kosovichev, A. G., Joyce Ann Guzik i Paul A. Bradley. "Solar Oscillations". W STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3246561.

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Huang, Xiaodong, Peng Liu i Lei Zhang. "Research on Attenuation of Pressure Pulsation in Gasoline Injection System". W 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5748874.

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He, Shouzhan, Zongxia Jiao, Changbin Guan i Yuanzhi Xu. "Research on pulsation attenuation characteristics of expansion chamber in hydraulic systems". W 2012 10th IEEE International Conference on Industrial Informatics (INDIN). IEEE, 2012. http://dx.doi.org/10.1109/indin.2012.6301206.

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Mathur, S., R. A. García, C. Régulo, J. Ballot, D. Salabert, W. J. Chaplin, Joyce Ann Guzik i Paul A. Bradley. "Analysing Solar-like Oscillations with an Automatic Pipeline". W STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3246559.

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Metcalfe, T. S., O. L. Creevey, J. Christensen-Dalsgaard, Joyce Ann Guzik i Paul A. Bradley. "A Stellar Model-fitting Pipeline for Solar-like Oscillations". W STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3246558.

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Aleluia, Leovir Cardoso, Alana da Silva Magalhaes, Alan Henrique Ferreira Silva, Wesley P. Calixto, Aylton Jose Alves, Calebe Abrenhosa Matias, Elder Geraldo Domingues i Jose Luiz Domingos. "Attenuation methodology for torque oscillations in synchronous machine". W 2017 IEEE URUCON. IEEE, 2017. http://dx.doi.org/10.1109/urucon.2017.8171885.

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L. R. Barbosa i A. Lenzi. "Analysis of discharge muffler designs for gas pulsation attenuation in reciprocal compressors". W 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-1851.

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