Bibliographies thématiques / Auxiliary dynamics

Littérature scientifique sur le sujet « Auxiliary dynamics »

Auteur : Grafiati
Publié le 7 juillet 2024
Mis à jour le 7 juillet 2024

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Articles de revues sur le sujet "Auxiliary dynamics"

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Zakharov, Anatoly Yu. « Field Form of the Dynamics of Classical Many- and Few-Body Systems : From Microscopic Dynamics to Kinetics, Thermodynamics and Synergetics ». Quantum Reports 4, no 4 (20 novembre 2022) : 533–43. http://dx.doi.org/10.3390/quantum4040038.

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A method is proposed for describing the dynamics of systems of interacting particles in terms of an auxiliary field, which in the static mode is equivalent to given interatomic potentials, and in the dynamic mode is a classical relativistic composite field. It is established that for interatomic potentials, the Fourier transform of which is a rational algebraic function of the wave vector, the auxiliary field is a composition of elementary fields that satisfy the Klein-Gordon equation with complex masses. The interaction between particles carried by the auxiliary field is nonlocal both in space variables and in time. The temporal non-locality is due to the dynamic nature of the auxiliary field and can be described in terms of functional-differential equations of retarded type. Due to the finiteness mass of the auxiliary field, the delay in interactions between particles can be arbitrarily large. A qualitative analysis of the dynamics of few-body and many-body systems with retarded interactions has been carried out, and a non-statistical mechanisms for both the thermodynamic behavior of systems and synergistic effects has been established.
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Zakharov, Anatoly Yu, et Victor V. Zubkov. « Field-Theoretical Representation of Interactions between Particles : Classical Relativistic Probability-Free Kinetic Theory ». Universe 8, no 5 (12 mai 2022) : 281. http://dx.doi.org/10.3390/universe8050281.

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It was proven that the class of stable interatomic potentials can be represented exactly as a superposition of Yukawa potentials. In this paper, an auxiliary scalar field was introduced to describe the dynamics of a system of neutral particles (atoms) in the framework of classical field theory. In the case of atoms at rest, this field is equivalent to the interatomic potential, but in the dynamic case, it describes the dynamics of a system of atoms interacting through a relativistic classical field. A relativistic Lagrangian is proposed for a system consisting of atoms and an auxiliary scalar field. A complete system of equations for the relativistic dynamics of a system consisting of atoms and an auxiliary field was obtained. A closed kinetic equation was derived for the probability-free microscopic distribution function of atoms. It was shown that the finite mass of the auxiliary field leads to a significant increase in the effect of interaction retardation in the dynamics of a system of interacting particles.
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Mu�oz, Gerardo, et William S. Burgett. « Auxiliary ghost fields in statistical dynamics ». Journal of Statistical Physics 56, no 1-2 (juillet 1989) : 59–68. http://dx.doi.org/10.1007/bf01044231.

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Keogh, P. S., et M. O. T. Cole. « Contact Dynamic Response With Misalignment in a Flexible Rotor/Magnetic Bearing System ». Journal of Engineering for Gas Turbines and Power 128, no 2 (1 mars 2004) : 362–69. http://dx.doi.org/10.1115/1.2056530.

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This paper investigates the vibration characteristics of rotor displacement signals in a magnetic bearing system under conditions when rotor contact with auxiliary bearings is possible. Since these signals may be used for feedback control, it is necessary to determine how they may affect the ability of the controller to regain rotor levitation. An experimental system is used to demonstrate the sensitivity of the rotor nonlinear dynamic behavior to unbalance, which is sufficient to cause contact during rotor run-up through rigid-body and flexural mode critical speeds. Complex rotor dynamics may involve contact with more than one auxiliary bearing or bush. Application of appropriate rotating forces to the rotor through a magnetic bearing is also shown to induce similar contact dynamics. Thus, an alternative procedure for assessing the nonlinear rotor dynamic behavior is established with the potential for identification of appropriate control forces. The contact dynamics are also considered in the presence of auxiliary bearing misalignment. Misalignment may arise through physical translation of a housing or through steady-state offset errors in sensor measurements. A misalignment of 50% of the nominal radial clearance is applied at an auxiliary bearing. Various contact modes are evident as the rotor is run up in speed. During rundown, different contact dynamics may be encountered and the level of such hysteresis is assessed.
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Zakharov, Anatoly Yu, et Maxim A. Zakharov. « Relativistic model of interatomic interactions in condensed systems ». Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 25, no 4 (12 octobre 2023) : 494–504. http://dx.doi.org/10.17308/kcmf.2023.25/11480.

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A method was proposed to describe the dynamics of systems of interacting atoms in terms of an auxiliary field. The field is equivalent to the specified interatomic potentials at rest, and represents the classical relativistic field under dynamic conditions. It was determined that for central interatomic potentials, allowing for the Fourier transform, the auxiliary field is a superposition of elementary fields satisfying the Klein-Gordon-Fock equation with complex mass parameters
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Ebrahimi, Reza, Mostafa Ghayour et Heshmatallah Mohammad Khanlo. « Effects of some design parameters on bifurcation behavior of a magnetically supported coaxial rotor in auxiliary bearings ». Engineering Computations 34, no 7 (2 octobre 2017) : 2379–95. http://dx.doi.org/10.1108/ec-04-2017-0141.

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Purpose This paper aims to present bifurcation analysis of a magnetically supported coaxial rotor model in auxiliary bearings, which includes gyroscopic moments of disks and geometric coupling of the magnetic actuators. Design/methodology/approach Ten nonlinear equations of motion were solved using the Runge–Kutta method. The vibration responses were analyzed using dynamic trajectories, power spectra, Poincaré maps, bifurcation diagrams and the maximum Lyapunov exponent. The analysis was carried out for different system parameters, namely, the inner shaft stiffness, inter-rotor bearing stiffness, auxiliary bearing stiffness and disk position. Findings It was shown that dynamics of the system could be significantly affected by varying these parameters, so that the system responses displayed a rich variety of nonlinear dynamical phenomena, including quasi-periodicity, chaos and jump. Next, some threshold values were provided with regard to the design of appropriate parameters for this system. Therefore, the proposed work can provide an effective means of gaining insights into the nonlinear dynamics of coaxial rotor–active magnetic bearing systems with auxiliary bearings in the future. Originality/value This paper considered the influences of the inner shaft stiffness, inter-rotor bearing stiffness, auxiliary bearing stiffness and disk position on the bifurcation behavior of a magnetically supported coaxial rotor system in auxiliary bearings.
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Amador, A., N. Bagatella, R. Cordero et E. Rojas. « Auxiliary fields in the geometrical relativistic particle dynamics ». Journal of Physics A : Mathematical and Theoretical 41, no 11 (4 mars 2008) : 115401. http://dx.doi.org/10.1088/1751-8113/41/11/115401.

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Alshehry, Azzh Saad, Humaira Yasmin, Muhammad Wakeel Ahmad, Asfandyar Khan et Rasool Shah. « Optimal Auxiliary Function Method for Analyzing Nonlinear System of Belousov–Zhabotinsky Equation with Caputo Operator ». Axioms 12, no 9 (28 août 2023) : 825. http://dx.doi.org/10.3390/axioms12090825.

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This paper introduces the optimal auxiliary function method (OAFM) for solving a nonlinear system of Belousov–Zhabotinsky equations. The system is characterized by its complex dynamics and is treated using the Caputo operator and concepts from fractional calculus. The OAFM provides a systematic approach to obtain approximate analytical solutions by constructing an auxiliary function. By optimizing the parameters of the auxiliary function, an approximate solution is derived that closely matches the behavior of the original system. The effectiveness and accuracy of the OAFM are demonstrated through numerical simulations and comparisons with existing methods. Fractional calculus enhances the understanding and modeling of the nonlinear dynamics in the Belousov–Zhabotinsky system. This study contributes to fractional calculus and nonlinear dynamics, offering a powerful tool for analyzing and solving complex systems such as the Belousov–Zhabotinsky equation.
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Shchelchkov, Kirill Aleksandrovich. « Relative optimality in nonlinear differential games with discrete control ». Sbornik : Mathematics 214, no 9 (2023) : 1337–50. http://dx.doi.org/10.4213/sm9851e.

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Two control problems with an obstacle that is the second player in a differential game are considered. The dynamics in the first problem is described by a nonlinear system of differential equations of the first order, whereas the dynamics in the second is described by a nonlinear system of differential equations of the second order. A piecewise constant control with finite set of values is used. The control is aimed at moving arbitrarily closely to a finite trajectory described by an auxiliary control system of simple form, for any actions of the obstacle. For both problems phase constraints on the auxiliary system under which the control of the auxiliary system can be arbitrary are obtained. For any neighbourhood and any control of the auxiliary system satisfying these constraints, there are admissible controls in the original problems ensuring that at each moment of time the phase point of the original system is in the indicated neighbourhood of the corresponding phase point of the auxiliary system. Thus, in view of the above constraints, when the control of the auxiliary system is chosen to be optimal in a certain sense, the original system can move arbitrarily closely to such a solution of the auxiliary system for any actions of the obstacle. Bibliography: 29 titles.
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Atkinson, C., J. M. Bastero et I. Miranda. « Path-independent integrals in fracture dynamics using auxiliary fields ». Engineering Fracture Mechanics 25, no 1 (janvier 1986) : 53–62. http://dx.doi.org/10.1016/0013-7944(86)90203-1.

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Thèses sur le sujet "Auxiliary dynamics"

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Liu, Jie. « State Estimation for Linear Singular and Nonlinear Dynamical Systems Based on Observable Canonical Forms ». Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2024. http://www.theses.fr/2024ISAB0002.

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Cette thèse a pour objectif, d’une part, de concevoir des estimateurs pour les systèmessinguliers linéaires en utilisant la méthode des fonctions de modulation. D’autrepart, elle vise à développer des observateurs pour une classe de systèmes dynamiquesnon linéaires en utilisant la méthode des formes normales d’observateurs. Pour lessystèmes singuliers, les estimateurs conçus sont présentés sous forme de formulesintégrales algébriques, garantissant une convergence non asymptotique. Une caractéristique essentielle des algorithmes d’estimation conçus est que les mesures bruitées des sorties ne sont impliquées que dans des termes intégraux, conférant ainsi aux estimateurs une robustesse face aux bruits perturbateurs. Pour les systèmes non linéaires, l’idée principale de conception consiste à transformer les systèmes proposés en une forme simplifiée qui supporte les observateurs existants tels que l’observateur à grandgain et l’observateur en mode glissant. Cette forme simple est appelée forme canoniqueobservable dépendant de la sortie auxiliaire.Pour les systèmes singuliers linéaires, nous transformons le système considéré enune forme similaire à la forme canonique observable de Brunovsky en injectant lesdérivées des entrées et des sorties. Tout d’abord, pour les systèmes singuliers linéairesmono-entrée mono-sortie, la condition d’observabilité est proposée. Des formules algébriques avec une fenêtre d’intégration glissante sont obtenues pour les variables dans différentes situations sans connaître la condition initiale du système. Ensuite, pour les systèmes singuliers linéaires à multiples entrées et sorties, une méthode innovante d’estimation non asymptotique et robuste basée sur la forme canonique observable à l’aide d’un ensemble de systèmes dynamiques de modulation auxiliaires est introduite. Ces derniers systèmes auxiliaires sont donnés par la forme canonique observable contrôlable avec des conditions initiales nulles. En introduisant un ensemble de systèmes dynamiques de modulation auxiliaires qui fournit un cadre plus général pour générer les fonctions de modulation requises, des formules intégrales algébriques sont obtenues à la fois pour les variables d’état et les dérivées de sortie. De plus, l’efficacité et la robustesse des estimateurs proposés sont vérifiées par des simulations numériques dans cette thèse.Pour les systèmes dynamiques non linéaires, nous proposons une famille de systèmesdynamiques non linéaires à multiples sorties "prêts à porter" qui peuvent êtretransformés en formes normales d’observateurs dépendant de la sortie auxiliaire, permettant ainsi le support de l’observateur en mode glissant bien connu. Pour cela, aumoyen de la méthode d’extension de dynamique et d’un ensemble des changementsde coordonnées (calculs algébriques intégraux de base), les termes non linéairessont annulés par une dynamique auxiliaire ou remplacés par des fonctions non linéairesdes multiples sorties. Il convient de mentionner que cette procédure est menée à biende manière compréhensible sans recourir aux outils de la géométrie différentielle, cequi est convivial pour ceux qui ne sont pas familiers avec les calculs des crochets deLie. De plus, l’efficacité et la robustesse des observateurs proposés sont vérifiées pardes simulations numériques dans cette thèse. Deuxièmement, une classe plus large desystèmes dynamiques non linéaires à multiples entrées et sorties "prêts à porter" estfournie pour étendre et développer davantage les systèmes proposés dans le premiercas. De manière similaire, au moyen de la dynamique auxiliaire correspondante etd’un ensemble des changements de coordonnées, les systèmes fournis sont convertisen formes normales non linéaires ciblées dépendant à la fois des multiples sorties etdes variables auxiliaires. Naturellement, cette procédure est également réalisée sansrecourir aux outils géométriques. Enfin, des conclusions sont présentées avec quelques perspectives
This thesis aims, on the one hand, to design estimators for linear singular systems usingthemethod of modulation functions. On the other hand, it aims to develop observersfor a class of nonlinear dynamical systems using the method of canonical formsof observers. For singular systems, the designed estimators are presented in the formof algebraic integral equations, ensuring non-asymptotic convergence. An essentialcharacteristic of the designed estimation algorithms is that noisy measurements of theoutputs are only involved in integral terms, thereby imparting robustness to the estimatorsagainst perturbing noises. For nonlinear systems, the main design idea is totransform the proposed systems into a simplified form that accommodates existingobservers such as the high-gain observer and the sliding-mode observer. This simpleformis called auxiliary output depending observable canonical form.For the linear singular systems, we transform the considered system into a formsimilar to the Brunovsky’s observable canonical form with the injection of the inputs’and outputs’ derivatives. First, for linear singular systems with single input and singleoutput, the observability condition is proposed. The system’s input-output differentialequation is derived based on the Brunovsky’s observable canonical form. Algebraicformulas with a sliding integration window are obtained for the variables in differentsituations without knowing the system’s initial condition. Second, for linear singular systemswith multiple input and multiple output, an innovative nonasymptotic and robust estimation method based on the observable canonical form by means of a set of auxiliary modulating dynamical systems is introduced. The latter auxiliary systems are given by the controllable observable canonical with zero initial conditions. The proposed method is applied to estimate the states and the output’s derivatives for linear singular system in noisy environment. By introducing a set of auxiliary modulating dynamical systems which provides a more general framework for generating the requiredmodulating functions, algebraic integral formulas are obtained both for the state variables and the output’s derivatives. After giving the solutions of the required auxiliary systems, error analysis in discrete noisy case is addressed, where the provided noise error bound can be used to select design parameters.For the nonlinear dynamical systems, we propose a family of "ready to wear" nonlineardynamical systemswith multiple outputs that can be transformed into the outputauxiliarydepending observer normal forms which can support the well-known slidingmode observer. For this, by means of the so-called dynamics extension method anda set of changes of coordinates (basic algebraic integral computations), the nonlinearterms are canceled by auxiliary dynamics or replaced by nonlinear functions of themultiple outputs. It is worth mentioning that this procedure is finished in a comprehensible way without resort to the tools of differential geometry, which is user-friendly for those who are not familiar with the computations of Lie brackets. In addition, the efficiency and robustness of the proposed observers are verified by numerical simulations in this thesis. Second, a larger class of "ready to wear" nonlinear dynamicalsystems with multiple inputs and multiple outputs are provided to further extend anddevelop the systems proposed in the first case. In a similar way, by means of the corresponding auxiliary dynamics and a set of changes of coordinates, the provided systems are converted into targeted nonlinear observable canonical forms depending on both the multiple outputs and auxiliary variables. Naturally, this procedure is still completed without resort to geometrical tools. Finally, conclusions are outlined with some perspectives
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Plank, Jack R. « Nuclear Thermal Propulsion Cool-Down Phase Optimization Through Quasi-Steady Computational Analysis, and the Effect of Auxiliary Heat Removal Systems ». The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618934609976051.

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McCord, Christopher George. « Data-driven dynamic optimization with auxiliary covariates ». Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122098.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Thesis: Ph. D., Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 183-190).
Optimization under uncertainty forms the foundation for many of the fundamental problems the operations research community seeks to solve. In this thesis, we develop and analyze algorithms that incorporate ideas from machine learning to optimize uncertain objectives directly from data. In the first chapter, we consider problems in which the decision affects the observed outcome, such as in personalized medicine and pricing. We present a framework for using observational data to learn to optimize an uncertain objective over a continuous and multi-dimensional decision space. Our approach accounts for the uncertainty in predictions, and we provide theoretical results that show this adds value. In addition, we test our approach on a Warfarin dosing example, and it outperforms the leading alternative methods.
In the second chapter, we develop an approach for solving dynamic optimization problems with covariates that uses machine learning to approximate the unknown stochastic process of the uncertainty. We provide theoretical guarantees on the effectiveness of our method and validate the guarantees with computational experiments. In the third chapter, we introduce a distributionally robust approach for incorporating covariates in large-scale, data-driven dynamic optimization. We prove that it is asymptotically optimal and provide a tractable general-purpose approximation scheme that scales to problems with many temporal stages. Across examples in shipment planning, inventory management, and finance, our method achieves improvements of up to 15% over alternatives. In the final chapter, we apply the techniques developed in previous chapters to the problem of optimizing the operating room schedule at a major US hospital.
Our partner institution faces significant census variability throughout the week, which limits the amount of patients it can accept due to resource constraints at peak times. We introduce a data-driven approach for this problem that combines machine learning with mixed integer optimization and demonstrate that it can reliably reduce the maximal weekly census.
by Christopher George McCord.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center
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Gibson, Hannah Cameron. « Auxiliary placement in Rangi : a dynamic syntax perspective ». Thesis, SOAS, University of London, 2012. http://eprints.soas.ac.uk/16637/.

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The Tanzanian Bantu language Rangi is unusual in that it exhibits a construction in which an infinitival verb form precedes an inflected auxiliary. This ordering of the infinitive with respect to the auxiliary is marked within the context of East African Bantu. It also contradicts Greenberg's (1963) proposed linguistic universal that Subject Verb Object languages exhibit auxiliary-infinitive order. Whilst the infinitive precedes the auxiliary in main declarative clauses, auxiliaryinfinitive order is found in negative, interrogative and cleft constructions, as well as in relative and subordinate clauses. This thesis examines infinitive-auxiliary order in Rangi, providing a detailed description of the structure and contexts in which the construction is used. Based on this, a formal analysis is developed from the perspective of Dynamic Syntax (Kempson et al. 2001; Cann et al. 2005b) - a framework which models the establishment of propositional structure by focusing on the dynamics of the parsing/production process in a time-linear manner. The infinitive-auxiliary order is captured by adopting an analysis in which infinitival verb forms are projected onto an unfixed predicate node. In contrast, auxiliaries project fixed minimal predicate-argument structure and introduce temporal information. The alternation auxiliary-infinitive order is subsequently analysed as resulting from the presence of an unfixed node. The analysis presented depends on the independent restriction operative in the Dynamic Syntax framework under which two unfixed nodes of the same modality cannot co-exist. This restriction is the result of the two nodes being defined identically in terms of tree logic. The presence of an unfixed node is taken as a trigger for the auxiliary-infinitive order, whilst the infinitive-auxiliary order is found in the absence of this trigger. A formal definition of the rule of PREDICATE ADJUNCTION is presented. The analysis provides further support for the availability of the building and re-building of the same structure within a semantic tree which is permissible in Dynamic Syntax. The thesis interrogates the extent to which similar syntactic contexts can be seen to motivate, and inform, distributional properties of similar (and distinct) elements in languages in unrelated language families.
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Jenkins, Kerry. « Development of dynamic resolutions for asymmetric synthesis ». Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241636.

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Astley, Marcus Robert. « Orchestrated stakeholder dialogue : its place in dynamic capability theory and its practical value for business ». Thesis, London Metropolitan University, 2015. http://repository.londonmet.ac.uk/921/.

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Dynamic capabilities have been widely discussed in the academic literature for over twenty years. Yet there remains a lack of consensus or conceptual clarity on a common definition. The priority for researchers is therefore to pursue further theoretical development of the concept. In addition, most empirical research to date has been based on quantitative research. Qualitative, granular treatment of the topic has been encouraged (see p.44). Accordingly, in this thesis, the data from the main study was collected from in-depth interviews with change consultants, and the emerging theory was tested in a follow-up study using further interviews with case study participants. The data from both studies was analysed using a grounded theory approach. The emergent and flexible nature of grounded theory complements the use of semi-structured interview questions, because both grounded theory and semi-structured interviews facilitate the drilling down into, and the microscopic exploration of, those data which are of greatest interest. I identify a phenomenon in the primary data from the main study, which I call ‘orchestrated stakeholder dialogue’– the purposeful orchestration of dialogue amongst the organisation’s stakeholders. Some empirical examples of this phenomenon are presented. The follow-up study further examines the phenomenon of orchestrated stakeholder dialogue in order to explore: 1) the relationship of this phenomenon to dynamic capability theory; 2) the context of the phenomenon; 3) how it is deployed; and 4) its potential for securing sustainable competitive advantage. The thesis uses an instrumental reading of stakeholder theory in order better to depict and locate orchestrated stakeholder dialogue in relation to the organisation’s traditional boundaries. I conclude that the phenomenon of orchestrated stakeholder dialogue is a foundational, underlying component of the dynamic capabilities concept, which underpins all dynamic capabilities. The identification of orchestrated stakeholder dialogue represents a significant step in developing a conceptual theory of dynamic capability in which dialogue is a consistent component. Further research could build on this advance in dynamic capabilities theory. The detailed depiction of orchestrated stakeholder dialogue in the thesis also represents a significant empirical contribution for strategy as practice. The thesis offers two steps towards advancing the practical value of the concept of dynamic capabilities to practitioners: (i) the organisation is encouraged to use dialogue to map more fully the sources of value derived by particular stakeholders from their relationship with the organisation and its capability; and (ii) where possible, organisations must reconceive and reconfigure the relationships with stakeholders in order to accommodate and harness heterogeneous perceptions of value.
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Yong, Woon Yik. « On the dynamic thermal and thermoelastic contact interaction between a rotor and an auxiliary bearing ». Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428356.

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Vanzini, Marco. « Auxiliary systems for observables : dynamical local connector approximation for electron addition and removal spectra ». Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX012/document.

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Cette thèse propose une méthode théorique innovante pour l'étude des spectres d'excitation à un électron, mesurée par spectroscopie de photoémission directe et inverse.La plupart des calculs actuels au niveau de l’état de l’art reposent sur des fonctions de Green à plusieurs corps et des self-énergies complexes et non locales, évaluées spécifiquement pour chaque matériau. Même lorsque les spectres calculés sont en très bon accord avec les expériences, le coût de calcul est très important. La raison est que la méthode elle-même n'est pas efficace, car elle fournit beaucoup d'informations superflues qui ne sont pas nécessaires pour l'interprétation des données expérimentales.Dans cette thèse, nous proposons deux raccourcis par rapport à la méthode standard. Le premier est l'introduction d'un système auxiliaire qui cible, en principe, le spectre d'excitation du système réel. L'exemple type est la théorie de la fonctionnelle de la densité, pour lequel le système auxiliaire est le système de Kohn-Sham : elle reproduit exactement la densité du système réel par l'intermédiaire d'un potentiel réel et statique, le potentiel de Kohn-Sham. La théorie de la fonctionnelle de la densité est, cependant, une théorie de l'état fondamental, qui ne fournit que rarement des propriétés d'état excités : un exemple est le fameux problème de la sous-estimation de la bande interdite. Le potentiel que nous proposons (le potentiel spectral), local et dépendant de la fréquence, mais réelle, peut être considéré comme une généralisation dynamique du potentiel de Kohn-Sham qui donne en principe le spectre exact.Le deuxième raccourci est l'idée de calculer ce potentiel une fois pour toute dans un système modèle, le gaz d'électrons homogène, et de le tabuler. Pour étudier des matériaux réels, nous concevons un connecteur qui prescrit l'utilisation des résultats du gaz pour calculer les spectres électroniques.La première partie de la thèse traite de l'idée de systèmes auxiliaires, montrant le cadre général dans lequel ils peuvent être introduits et les équations qu'ils doivent satisfaire. Nous utilisons des modèles de Hubbard solubles exactement pour mieux comprendre le rôle du potentiel spectral ; en particulier, il est démontré que le potentiel peut être défini uniquement chaque fois que le spectre est non nul, et donne toujours les spectres attendus, même lorsque la partie imaginaire ou les contributions non locales de la self-énergie jouent un rôle de premier plan.Dans la deuxième partie de la thèse, nous nous concentrons sur les calculs pour les systèmes réels. Nous évaluons d'abord le potentiel spectral dans le gaz d'électrons homogène, puis l'importons dans le système auxiliaire pour évaluer le spectre d'excitation. Toute l’interdependence non triviale entre l'interaction électronique et l'inhomogénéité du système réel entre dans la forme du connecteur. Trouver une expression pour cela est le véritable défi de la procédure. Nous proposons une approximation raisonnable basée sur les propriétés locales du système, que nous appelons approximation du connecteur dynamique local.Nous mettons en œuvre cette procédure pour quatre prototypes de matériaux différents : le sodium, un métal presque homogène ; l'aluminium, encore un métal mais moins homogène ; le silicium, un semi-conducteur ; l'argon, un isolant inhomogène. Les spectres que nous obtenons avec cette approche concordent de manière impressionnante avec ceux qui sont évalués via la self-énergie, très coûteuse en temps de calcul, démontrant ainsi le potentiel de cette théorie
This thesis proposes an innovative theoretical method for studying one-electron excitation spectra, as measured in photoemission and inverse photoemission spectroscopy.The current state-of-the-art realistic calculations rely usually on many-body Green’s functions and complex, non-local self energies, evaluated specifically for each material. Even when the calculated spectra are in very good agreement with experiments, the computational cost is very large. The reason is that the method itself is not efficient, as it yields much superfluous information that is not needed for the interpretation of experimental data.In this thesis we propose two shortcuts to the standard method. The first one is the introduction of an auxiliary system that exactly targets, in principle, the excitation spectrum of the real system. The prototypical example is density functional theory, in which the auxiliary system is the Kohn-Sham system: it exactly reproduces the density of the real system via a real and static potential, the Kohn-Sham potential. Density functional theory is, however, a ground state theory, which hardly yields excited state properties: an example is the famous band-gap problem. The potential we propose (the spectral potential), local and frequency-dependent, yet real, can be viewed as a dynamical generalisation of the Kohn-Sham potential which yields in principle the exact spectrum.The second shortcut is the idea of calculating this potential just once and forever in a model system, the homogeneous electron gas, and tabulating it. To study real materials, we design a connector which prescribes the use of the gas results for calculating electronic spectra.The first part of the thesis deals with the idea of auxiliary systems, showing the general framework in which they can be introduced and the equations they have to fulfill. We then use exactly-solvable Hubbard models to gain insight into the role of the spectral potential; in particular, it is shown that a meaningful potential can be defined wherever the spectrum is non-zero, and that it always yields the expected spectra, even when the imaginary or the non-local parts of the self energy play a prominent role.In the second part of the thesis, we focus on calculations for real systems. We first evaluate the spectral potential in the homogeneous electron gas, and then import it in the auxiliary system to evaluate the excitation spectrum. All the non-trivial interplay between electron interaction and inhomogeneity of the real system enters the form of the connector. Finding an expression for it is the real challenge of the procedure. We propose a reasonable approximation for it, based on local properties of the system, which we call dynamical local connector approximation.We implement this procedure for four different prototypical materials: sodium, an almost homogeneous metal; aluminum, still a metal but less homogeneous; silicon, a semiconductor; argon, an inhomogeneous insulator. The spectra we obtain with our approach agree to an impressive extent with the ones evaluated via the computationally expensive self energy, demonstrating the potential of this theory
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SOUZA, Regina Machado de. « Um instrumento para auxiliar o produtor na tomada de decisão quanto à data de venda da soja ». Universidade Federal de Goiás, 2010. http://repositorio.bc.ufg.br/tede/handle/tde/405.

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Made available in DSpace on 2014-07-29T14:49:09Z (GMT). No. of bitstreams: 1 Regina Machado de Souza.pdf: 2267991 bytes, checksum: 8d027b752f21409f678aeb40c2f660a8 (MD5) Previous issue date: 2010-08-17
This word aimeded to develop a friendly computational tool that, given the expectation of the producer in relation to soybean prices at a future date, help them decide whether or not it‟s worth waiting to sell their produce at that future date or sell in the current date. This work relied mainly with the System Dynamics methodology for model building and testing of Box-Jenkins to obtain the price expectations. The model also allows deriving the likely minimum price to be received by the producer in order to justify its decision to postpone its sale. We found no empirical evidence capable of sustaining the existence of a priori a better time to sell soybeans.
Este trabalho desenvolveu um instrumento computacional amigável que pudesse, dada a expectativa do produtor em relação ao preço da soja em uma data futura, auxiliá-lo a decidir se vale a pena ou não esperar para vender sua produção naquela data futura ou vendê-la na data atual. Para tanto, contou principalmente com a metodologia System Dynamics para construção do modelo e a análise de Box-Jenkins para obtenção das expectativas de preços. O modelo desenvolvido, também, permite auferir o provável preço mínimo a ser recebido pelo produtor, a fim de que possa justificar sua decisão em postergar sua venda. Não foram encontradas evidências empíricas capazes de sustentar a existência a priori de uma melhor data para se vender a soja.
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Esna, Ashari Esfahani Alireza. « Détection active de pannes dans les systèmes dynamiques en boucle fermée ». Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1060.

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L'objectif de cette thèse est de développer une nouvelle méthodologie pour la détection active de défaillances, basée sur approche multimodèle et robuste des fautes. Ce travail prolonge des recherches effectuées dans le projet Metalau de l'Inria. L'apport essentiel de cette thèse est la prise en compte de modèles évoluant en boucle fermée. On utilise une approche multi-modèle pour modéliser le modèle en fonctionnement normal et le modèle défaillant. Les avantages potentiels de l'utilisation d'un feedback dynamique linéaire et ses propriétés de robustesse sont analysés dans la construction de signaux de détection auxiliaires. On compare les résultats obtenus avec ceux du cas boucle ouverte. La formulation du problème de détection active dans le cas d'un modèle en boucle fermée est nouvelle et repose sur la prise en considération de la norme du signal de détection auxiliaire comme critère d'optimisation. On considère aussi des fonctions coût plus générales, telles celles qui sont utilisées pour mesurer la performance de feedbacks dans des problèmes de la théorie de la commande linéaire robuste. La solution complète repose sur la résolution de plusieurs problèmes d'optimisation non standards
The aim is to develop a novel theory of robust active failure detection based on multi-model formulation of faults. The original method was already proposed by the Metalau group of INRIA. We have continued to work on the extension of this approach to more general cases. The focus is on the effects of feedback on the previous approach. The multi-model approach is still used to model the normal and the failed systems; however the possible advantages of using linear dynamic feedback in the construction of the auxiliary signal for robust fault detection is considered and the results are compared to the previously developed open-loop setup. An original formulation of the active fault detection problem using feedback is developed. The norm of the auxiliary signal is considered as a possible cost criterion. Also, we have considered a more general cost function that has already been used for measuring the performance of feedback configurations in Linear Control Theory. We have given a complete solution to this problem. In order to find a complete solution, several mathematical problems are solved
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Livres sur le sujet "Auxiliary dynamics"

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Annamalai, E. Dynamics of verbal extension in Tamil. Trivandrum, Kerala : Dravidian Linguistics Association of India, 1985.

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Xiaojun, Wang, dir. Hang tian qi qi dong li fu zhu bian gui dong li xue yu zui you kong zhi. Beijing Shi : Zhongguo yu hang chu ban she, 2006.

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T, Flowers George, et United States. National Aeronautics and Space Administration., dir. Synchronous dynamics of a coupled shaft-bearing-housing system with auxiliary support for a clearance bearing : Analysis and experiment. [Washington, DC : National Aeronautics and Space Administration, 1992.

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A, Malinkovskai︠a︡, dir. Genrikh Neĭgauz i ego ucheniki : Pianisty-gnesint︠s︡y rasskazyvai︠u︡t. Moskva : Klassika-XXI, 2007.

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L, Labus Thomas, Lovely Ronald G et United States. National Aeronautics and Space Administration., dir. Solar dynamic power module design. [Washington, DC] : National Aeronautics and Space Administration, 1989.

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Marinca, Vasile, Nicolae Herisanu et Bogdan Marinca. Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6.

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T, Korakianitis, et United States. National Aeronautics and Space Administration., dir. Dynamic modeling of solar dynamic components and systems : J.I. Hochstein and T. Korakianitis. [Washington, DC : National Aeronautics and Space Administration, 1992.

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L, Christiansen Eric, Fleming Michael L et United States. National Aeronautics and Space Administration., dir. On protection of Freedom's solar dynamic radiator from the orbital debris environment. [Washington, DC] : National Aeronautics and Space Administration, 1991.

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L, Christiansen Eric, Fleming Michael L et United States. National Aeronautics and Space Administration., dir. On protection of Freedom's solar dynamic radiator from the orbita debris environment. [Washington, DC] : National Aeronautics and Space Administration, 1990.

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Flowers, G. T. Dynamic behavior of a magnetic bearing supported jet engine rotor with auxiliary bearings. Albuquerque, N.M : TSI Press, 1994.

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Chapitres de livres sur le sujet "Auxiliary dynamics"

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Kolev, Nikolay Ivanov. « Some Auxiliary Systems ». Dans Multiphase Flow Dynamics 5, 505–21. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15156-4_11.

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Kolev, Nikolay I. « Some auxiliary systems ». Dans Multiphase Flow Dynamics 4, 405–21. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92918-5_11.

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Kolev, Nikolay Ivanov. « Some auxiliary systems ». Dans Multiphase Flow Dynamics 5, 461–77. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20601-6_11.

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Fahy, S. « Ground-State Projection with Auxiliary Fields : Imaginary-Time and Simulation-Time Dynamics ». Dans Springer Proceedings in Physics, 122–34. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78448-4_11.

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Karkori, Fidaa. « Auxiliary System Design ». Dans Dynamic Positioning Systems, 45–47. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-59173-0_5.

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Kutoyants, Yu. « Auxiliary Results ». Dans Identification of Dynamical Systems with Small Noise, 11–38. Dordrecht : Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1020-4_2.

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Marinca, Vasile, Nicolae Herisanu et Bogdan Marinca. « The Optimal Auxiliary Functions Method ». Dans Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems, 11–16. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6_2.

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Marinca, Vasile, Nicolae Herisanu et Bogdan Marinca. « Piecewise Optimal Auxiliary Functions Method ». Dans Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems, 417–34. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6_30.

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Marinca, Vasile, Nicolae Herisanu et Bogdan Marinca. « Dynamic Analysis of a Rotating Electrical Machine Rotor-Bearing System ». Dans Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems, 159–65. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6_16.

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Marinca, Vasile, Nicolae Herisanu et Bogdan Marinca. « Dynamic Response of a Permanent Magnet Synchronous Generator to a Wind Gust ». Dans Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems, 177–84. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6_18.

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Actes de conférences sur le sujet "Auxiliary dynamics"

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Hembree, Charles, Joshua Hanson, Biliana Paskaleva, Pavel Bochev, Eric Keiter, Alan Mar et Ting Mei. « Semiconductor Device Models Constructed Using Simple Elements and Auxiliary Dynamics . » Dans Proposed for presentation at the Mechanistic Machine Learning and Digital Twins for Computational Science, Engineering & Technology held September 26-29, 2021 in San Diego, CA. US DOE, 2021. http://dx.doi.org/10.2172/1890913.

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Keogh, Patrick S., et Matthew O. T. Cole. « Contact Dynamic Response With Misalignment in a Flexible Rotor/Magnetic Bearing System ». Dans ASME Turbo Expo 2004 : Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53818.

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This paper investigates the vibration characteristics of rotor displacement signals in a magnetic bearing system under conditions when rotor contact with auxiliary bearings is possible. Since these signals may be used for feedback control, it is necessary to determine how they may affect the ability of the controller to regain rotor levitation. An experimental system is used to demonstrate the sensitivity of the rotor non-linear dynamic behavior to unbalance, which is sufficient to cause contact during rotor run up through rigid body and flexural mode critical speeds. Complex rotor dynamics may involve contact with more than one auxiliary bearing or bush. Application of appropriate rotating forces to the rotor through a magnetic bearing is also shown to induce similar contact dynamics. Thus an alternative procedure for assessing the non-linear rotor dynamic behavior is established with the potential for identification of appropriate control forces. The contact dynamics are also considered in the presence of auxiliary bearing misalignment. Misalignment may arise through physical translation of a housing or through steady state offset errors in sensor measurements. A misalignment of 50% of the nominal radial clearance is applied at an auxiliary bearing. Various contact modes are evident as the rotor is run up in speed. During run down different contact dynamics may be encountered and the level of such hysteresis is assessed.
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Lawen, James L., et George T. Flowers. « Interaction Dynamics Between a Flexible Rotor and an Auxiliary Clearance Bearing ». Dans ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0022.

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Abstract This study investigates the application of synchronous interaction dynamics methodology to the design of auxiliary bearing systems. The technique is applied to a flexible rotor system and comparisons are made between the behavior predicted by this analysis method and the observed simulation response characteristics. Of particular interest is the influence of coupled shaft/bearing vibration modes on rotordynamical behavior. Experimental studies are also performed to validate the simulation results and provide insight into the expected behavior of such a system.
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Sipavichyus, Ch, R. Shlezhas et Arunas Amulevicius. « Dynamics of auxiliary gas outflow under laser cutting : models and the experiment ». Dans Progress in Research and Development of High-Power Industrial CO2 Lasers, sous la direction de Vladislav Y. Panchenko et Vladimir S. Golubev. SPIE, 2000. http://dx.doi.org/10.1117/12.394127.

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Qin, Qingquan, Guojun Yang, Zhengang Shi et Suyuan Yu. « Preliminary Research of Auxiliary Bearing in HTR-10GT Project ». Dans 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48163.

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Active Magnetic Bearing (AMB) was used in the project of 10MW high temperature gas-cooled reactor (HTR-10GT) for the advantages over conventional mechanical bearings: without any mechanical friction and lubrication, etc. Auxiliary Bearings (ABs) is one of the most important parts in the AMB system, and its main function is to support the rotor at rest and provide protection for the rotor system during an overload or magnetic bearings failure situation. This paper introduced auxiliary bearings used in the HTR-10GT project and compared its advantages and disadvantages with other types of auxiliary bearings. The dynamic behaviors and temperature variation are the most important factors that may affect the performance of auxiliary bearings in a rotor drop event, this paper also analyzed the touching down course and dynamics in detail, divided the drop down process into four distinct stages of motion: free fall, impact, sliding-whirling and rolling. Finally, a test rig built up for the following rotor drop test is presented in the article. Test results at lower drop down speed were discussed. The result of the theory and experiment research has important reference value for the auxiliary bearings design of HTR-10GT.
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Yang, Yee-Pien, Fu-Cheng Wang, Hsin-Ping Chang, Ying-Wei Ma, Chih-Wei Huang et Biing-Jyh Weng. « Proton Exchange Membrane Fuel Cell System Identification and Control : Part I — System Dynamics, Modeling and Identification ». Dans ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97119.

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This paper consists of two parts to address a systematic method of system identification and control of a proton exchange membrane (PEM) fuel cell. This fuel cell is used for communication devices of small power, involving complex electrochemical reactions of nonlinear and time-varying dynamic properties. From a system point of view, the dynamic model of PEM fuel cell is reduced to a configuration of two inputs, hydrogen and air flow rates, and two outputs, cell voltage and current. The corresponding transfer functions describe linearized subsystem dynamics with finite orders and time-varying parameters, which are expressed as discrete-time auto-regression moving-average with auxiliary input models for system identification by the recursive least square algorithm. In experiments, a pseudo random binary sequence of hydrogen or air flow rate is fed to a single fuel cell device to excite its dynamics. By measuring the corresponding output signals, each subsystem transfer function of reduced order is identified, while the unmodeled, higher-order dynamics and disturbances are described by the auxiliary input term. This provides a basis of adaptive control strategy to improve the fuel cell performance in terms of efficiency, transient and steady state specifications. Simulation shows the adaptive controller is robust to the variation of fuel cell system dynamics.
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Wang, Qingyu, Eric H. Maslen et Hyeong-Joon Ahn. « Incorporating Data Uncertainty in Rotordynamic Model Reconciliation ». Dans ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38595.

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A method called model reconciliation (MR) has previously been reported which modifies analytic rotordynamic models to make them match experimental data. An identified model derived from the experimental data and a nominal model from the engineering analysis are needed; an auxiliary dynamic system is then synthesized to modify the dynamics of the nominal model to match the identified model. The combination of the engineering model and the auxiliary dynamic system is the reconciled model. Due to numerous experimental uncertainties, the identified model may contain significant errors. These errors are then embedded by the reconciliation process so that the reconciled model is incorrect, and sometimes quite poor. A robust control synthesis method is presented here which accounts for model error bounds in generating the auxiliary dynamics to minimize their impact on the final model. To examine the validity of the process, extra data as a reference are used to compare with the data produced by the reconciled model. Both simulated data and experimental data are used to demonstrate the results of the method. The error model permits the synthesis to ignore spurious features of the identified model, thereby producing more reasonable results.
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Oruganti, Pradeep Sharma, Qadeer Ahmed et Daniel Jung. « Effects of Thermal and Auxiliary Dynamics on a Fuel Cell Based Range Extender ». Dans WCX World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1311.

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Ren, Zhongyuan, Xuejun Ren et Lingzhi Ren. « AO2DS : A Method of Auxiliary Operational Decision-making Based on System Dynamics Simulation ». Dans 2023 International Conference on Intelligent Systems, Advanced Computing and Communication (ISACC). IEEE, 2023. http://dx.doi.org/10.1109/isacc56298.2023.10084273.

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DeSmidt, Hans, Kon-Well Wang et Edward Smith. « Multi-Harmonic Adaptive Vibration Control of Magnetic Bearing-Driveline with Auxiliary Feedback : Theory and Experiment ». Dans 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1632.

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Rapports d'organisations sur le sujet "Auxiliary dynamics"

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Furman, Alex, Jan Hopmans, Shmuel Assouline, Jirka Simunek et Jim Richards. Soil Environmental Effects on Root Growth and Uptake Dynamics for Irrigated Systems. United States Department of Agriculture, février 2011. http://dx.doi.org/10.32747/2011.7592118.bard.

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Root water uptake is perhaps the most important unknown in the mass balance of hydrological and agricultural systems. The understanding and the ability to predict root uptake and the way it is influence by environmental conditions has great potential in increasing water and fertilizer use efficiency and allowing better control of water and contaminant leach towards groundwater. This BARD supported research is composed of several components, including a) intensive laboratory work for the quantification of root uptake and the way it is controlled by environmental conditions; b) development of tools for laboratory and field use that can help in sensing very low water fluxes and water content, which is a necessity for studying root uptake; c) development of capabilities to model compensated root uptake; and d) development of a database that will allow calibration of such a model. In addition some auxiliary research was performed as reported later. Some of the components, and especially the modeling and the HPP development, were completed in the framework of the project and even published in the international literature. The completed components provide a modeling environment that allows testing root compensated uptake modeling, a tool that is extremely important for true mechanistic understanding of root uptake and irrigation design that is based on mechanistic and not partially based myth. The new button HPP provides extended level of utilization of this important tool. As discussed below, other components did not get to maturity stage during the period of the project, but comprehensive datasets were collected and will be analyzed in the near future. A comprehensive dataset of high temporal and spatial resolution water contents for two different setups was recorded and should allow us understanding f the uptake at these fine resolutions. Additional important information about root growth dynamics and its dependence in environmental conditions was achieved in both Israel and the US. Overall, this BARD supported project provided insight on many important phenomena related to root uptake and to high resolution monitoring in the vadose zone. Although perhaps not to the level that we initially hoped for, we achieved better understanding of the related processes, better modeling capabilities, and better datasets that will allow continuation of this effort in the near future.
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Fu, G., J. Van Dam et M. Rosenbluth. Dynamical transition to second stability in auxiliary heated tokamaks. Office of Scientific and Technical Information (OSTI), mars 1989. http://dx.doi.org/10.2172/6309193.

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Baader, Franz, et Marcel Lippmann. Runtime Verification Using a Temporal Description Logic Revisited. Technische Universität Dresden, 2014. http://dx.doi.org/10.25368/2022.203.

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Formulae of linear temporal logic (LTL) can be used to specify (wanted or unwanted) properties of a dynamical system. In model checking, the system’s behaviour is described by a transition system, and one needs to check whether all possible traces of this transition system satisfy the formula. In runtime verification, one observes the actual system behaviour, which at any point in time yields a finite prefix of a trace. The task is then to check whether all continuations of this prefix to a trace satisfy (violate) the formula. More precisely, one wants to construct a monitor, i.e., a finite automaton that receives the finite prefix as input and then gives the right answer based on the state currently reached. In this paper, we extend the known approaches to LTL runtime verification in two directions. First, instead of propositional LTL we use the more expressive temporal logic ALC-LTL, which can use axioms of the Description Logic (DL) ALC instead of propositional variables to describe properties of single states of the system. Second, instead of assuming that the observed system behaviour provides us with complete information about the states of the system, we assume that states are described in an incomplete way by ALC-knowledge bases. We show that also in this setting monitors can effectively be constructed. The (double-exponential) size of the constructed monitors is in fact optimal, and not higher than in the propositional case. As an auxiliary result, we show how to construct Büchi automata for ALC-LTL-formulae, which yields alternative proofs for the known upper bounds of deciding satisfiability in ALC-LTL.
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