Tesis sobre el tema "Systèmes hamiltoniens à port"
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Medianu, Silviu. "Identification des systèmes hamiltoniens à ports". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT116/document.
Texto completoThe objective of this thesis is to develop a specific identification theory for Port Controlled Hamiltonian (PCH) systems. The main reasons to develop this theory comes from their remarkable properties like power conservation and stability under power preserving interconnection (e.g. parallel, series or feedback interconnections). In a first part PCH systems are analysed for structural identifiability using some classical or new techniques: observability/controllability identifiability, direct test, power series expansion or a new power energy approach, defining also a new concept of port identifiability. Further it is proposed a perturbation model by means of the interaction port together with a practical identifiability analysis realized using the controllability and observability concepts. The fourth part presents a new framework for time-discretization of PCH systems in the nonlinear or linear case, by combined discretization of the flows and efforts preserving in the same time their characteristic properties. Also in this part it is proposed a discretization error Hamiltonian to distinguish the continuous-time PCH system from the discrete-time one. The fifth part of the thesis makes an analysis of PCH systems identifiability using the subspace identification approach in the deterministic case, proposing also a new power energy approach in direct connection with the structural identifiability results. In the end are presented the main conclusions, personal contributions and perspectives for future work
Mokhtari, Fouad. "Commande des systèmes Hamiltoniens à ports commandés : application aux systèmes multimachines". Thèse, Université du Québec à Trois-Rivières, 2010. http://depot-e.uqtr.ca/1251/1/030161514.pdf.
Texto completoRamirez, Estay Hector. "Control of irreversible thermodynamic processes using port-Hamiltonian systems defined on pseudo-Poisson and contact structures". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10033/document.
Texto completoThis doctoral thesis presents results on the use of port Hamiltonian systems (PHS) and controlled contact systems for modeling and control of irreversible thermodynamic processes. Firstly, Irreversible PHS (IPHS) has been defined as a class of pseudo-port Hamiltonian system that expresses the first and second principle of Thermodynamics and encompasses models of heat exchangers and chemical reactors. These IPHS have been lifted to the complete Thermodynamic Phase Space endowed with a natural contact structure, thereby defining a class of controlled contact systems, i.e. nonlinear control systems defined by strict contact vector fields. Secondly, it has been shown that only a constant control preserves the canonical contact structure, hence a structure preserving feedback necessarily shapes the closed-loop contact form. The conditions for state feedbacks shaping the contact form have been characterized and have lead to the definition of input-output contact systems. Thirdly, it has been shown that strict contact vector fields are in general unstable at their zeros, hence the condition for the the stability in closed-loop has been characterized as stabilization on some closed-loop invariant Legendre submanifolds
Yaghi, Mohammed. "Phase Field Modeling of Water Solidification : A Port-Hamiltonian Approach". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10198.
Texto completoThis thesis presents a study on modeling, formulating, and discretizing solidification processes using the Port Hamiltonian framework combined with the phase field approach. The goal is to provide numerical models suitable for simulating, designing, and controlling such processes. It addresses the challenges of representing and controlling phase change phenomena in distributed parameter models with moving interfaces, with a particular focus on the solidification of pure water. The work has been motivated by the development of green processes for water purification technologies such as cyclic melt and crystallization of water, which offer a low-energy solution while minimizing the use of hazardous materials. The first chapter recalls briefly the physical models of multiphase systems and the description of the interface between the phases, in terms of thin or diffuse interfaces. It presents the phase field theory and the associated thermodynamical models of the multiphase systems. Finally, it expresses the dynamics of solidification processes as a coupled system of evolution equations consisting of the Allen-Cahn equation and energy balance equations. A main contribution of this chapter consists in a comprehensive presentation of solidification using the entropy functional approach within the phase field framework. In the second chapter, the Port Hamiltonian formulation of the dynamics of solidification processes using the phase field approach is developed. This chapter introduces Boundary Port Hamiltonian Systems and shows how an extension of the state space to the gradient of the phase field variable leads to a Port Hamiltonian formulation of the solidification model. The model is written in such a way that it utilizes the available thermodynamic data for liquid water and ice, allowing for a detailed and physically-based modeling, leading to an implicit Boundary Port Hamiltonian model. The final chapter focuses on the structure-preserving discretization of the solidification process using the Partitioned Finite Element Method. This ensures that the discretized model retains the Port Hamiltonian structure and, in turn, the key properties such as energy conservation and passivity. The chapter covers weak formulations, projections, and discrete Hamiltonians for the heat equation and the Allen-Cahn equation, leading to the spatial discretization of the solidification model. The principal contribution of this chapter lies in the discretization methodology applied to the implicit Port Hamiltonian model of the solidification process using entropy as the generating function. Overall, this thesis provides structured models of solidification processes using the Port Hamiltonian framework, providing a foundation for their physics-based simulation and control and for future research and development in distributed parameter systems with moving interfaces, particularly for environmental and chemical engineering applications
Ramirez, Estay Hector. "Commande de systèmes thermodynamiques irréversibles utilisant les systèmes Hamiltoniens à port définis sur des pseudo-crochets de Poisson et des structures de contact". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00866011.
Texto completoRomero, Velázquez José Guadalupe. "Commande robuste par façonnement d’énergie de systèmes non-linéaires". Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112019/document.
Texto completoThis thesis focuses on the design of robust control for nonlinear systems, mainly on mechanical systems. The results presented are to two situations widely discussed in control theory: 1) The stability of nonlinear systems disturbed; 2) The global tracking trajectory in mechanical systems having only knowledge of the position. We started giving a design method of robust controls to ensure regulation on non-passive output. In addition, if the system is perturbed (constant unmatched), rigorous proof to its rejection is provided. This result is based mainly on change of coordinates and integral dynamic control. When the scenario to deal are mechanical systems with time-varying matched and unmatched, disturbance, the system is endowed with strong properties as IISS (Integral Input-State Stable) and ISS (Input-State Stable). This is achieved based on the design method to rejection of constant disturbances (unmatched). However, due to the nonlinearity of the system, the controllers have a high complexity. For the same problem, a second and elegant result is given making a initial change of coordinate on the momenta variable, such that the controller significantly simplifies, preserving the aforementioned robustness properties. Finally, a convincing answer to the problem of global exponential tracking of mechanical systems is given taking into account only the position information. We solve this problem in two steps. First, some slight variation is presented to the proof of stability of a speed observer based on Immersion and Invariance theory recently published. Note that this is a speed observer satisfying the exponential convergence speed in mechanical systems. Secondly, and based on the change of coordinates (momenta), a globally exponentially stable tracking controller with position and velocity known is proposed. The combination of both results give the first global exponential tracking controller of mechanical systems without velocity measurements
Chera, Catalin-Marian. "Contribution à l'extension de l'approche énergétique à la représentation des systèmes à paramètres distribués". Phd thesis, Ecole Centrale de Lille, 2009. http://tel.archives-ouvertes.fr/tel-00578842.
Texto completoChorot, Thierry. "Modélisation commande et observation des systèmes mécaniques hamiltoniens : application à un pont roulant". Lyon 1, 1991. http://www.theses.fr/1991LYO10200.
Texto completoTrenchant, Vincent. "Discrétisation et commande frontière de systèmes vibro-acoustiques, une approche hamiltonienne à ports". Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD066/document.
Texto completoThis thesis deals with the boundary control of an acoustic by a network of co-localised sensors/actuators which constitutes a smart skin. In order to cope with this multiphysical problem, we chose to place our study in the framework of port-Hamiltonian systems, a structured approach based on the representation of energy exchanges between different energy domains between different systems of subsystems. We proposed a port-Hamiltonian model of the wave equation interconnected through its boundary to the distributed actuation system, which corresponds to a 2D formulation of the physical problem. We developed a spatial discretization method based on the use of finite differences on several staggered grids that preserve the port-Hamiltonian structure of the wave equation. This method also permits to easily interconnect the discretized system with other subsystems, which is convenient for instance for control purposes. Its main advantage over other structure preserving methods is its simplicity of implementation which stems from the use of finite differences. In order to control the vibro-acoustic system, we proposed a control law synthesis method for systems governed by two conservation laws in 1D. The originality of this method lies in the fact that it relies on the computation of structural invariants (Casimir functions) exploited in order to modify the structure of the system in closed loop. The conditions of application of these laws on a 2D system are studied and numerical results validate the synthesized control laws
Pham, Thanh Hung. "Commande optimale sous contraintes pour micro-réseaux en courant continu". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT086/document.
Texto completoThe goals of this thesis is to propose modelling and control solutions for the optimal energy management of a DC microgrid under constraints. The studied microgrid system includes electrical storage units (e.g., batteries, supercapacitors), renewable sources (e.g., solar panels) and loads (e.g., an electro-mechanical elevator system). These interconnected components are linked to a three phase electrical grid through a DC bus and associated DC/AC converters. The optimal energy management is usually formulated as an optimal control problem which takes into account the system dynamics, cost, constraints and reference profiles.An optimal energy management for the microgrid is challenging with respect to classical control theories. Needless to say, a DC microgrid is a complex system due to its heterogeneity, distributed nature (both spatial and in sampling time), nonlinearity of dynamics, multi-physic characteristics, the presence of constraints and uncertainties. Moreover, the power-preserving structure and the energy conservation of a microgrid are essential for ensuring a reliable operation.This challenges are tackled through the combined use of port-Hamiltonian formulations, differential flatness, and economic Model Predictive Control.The Port-Hamiltonian formalism allows to explicitly describe the power-preserving structure and the energy conservation of the microgrid and to connect different components of different physical natures through the same formalism. The strongly non-linear system is then translated into a flat representation. Taking into account differential flatness properties, reference profiles are generated such that the dissipated energy and various physical constraints are taken into account. Lastly, we minimize the purchasing/selling electricity cost within the microgrid using the economic Model Predictive Control with the Port-Hamiltonian formalism on graphs.The proposed control designs are validated through simulation results
Magos, Rivera Miguel. "Sur la modélisation des systèmes dynamiques à topologie variable : une formulation Hamiltonienne à ports paramétrée". Lyon 1, 2005. http://www.theses.fr/2005LYO10016.
Texto completoHamroun, Boussad. "Approche hamiltonienne à ports pour la modélisation, la réduction et la commande des systèmes non linéaires à paramètres distribués : application aux écoulements à surface libre". Grenoble INPG, 2009. http://www.theses.fr/2009INPG0119.
Texto completoA port hamiltonian formulation for shallow water equations is given. It exhibits trivially some interesting properties like passivity and energy conservation. Using a geometric reduction scheme based on mixed finite elements methods, a reduced port hamiltonian model was derived. This reduction preserves the dynamical qualitative properties of the original model. We show that the reduced port Hamiltonian model exhibits interesting spectral and input-output properties which converge two those of infinite dimensional model. A control algorithm which allows regulating the flow and water level are designed using the IDA-PBC and energy shaping method. The energy shaping method was generalized to the infinite dimensional model. Simulation results and an experimental validation of the control algorithm on a micro-canal platform are presented showing the effectiveness of the control law
Diagne, Mamadou Lamine. "Modelling and control of systems of conservation laws with a moving interface : an application to an extrusion process". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10098/document.
Texto completoThis thesis is devoted to the analysis of Partial Differential Equations (PDEs) which are coupled through a moving interface. The motion of the interface obeys to an Ordinary Differential Equation (ODE) which arises from a conservation law. The first part of this thesis concerns the modelling of an extrusion process based on mass, moisture content and energy balances. These balances laws express heat and homogeneous material transport in an extruder by hyperbolic PDEs which are defined in complementary time-varying domains. The evolution of the coupled domains is given by an ODE which is derived from the conservation of mass in an extruder. In the second part of the manuscript, a mathematical analysis has been performed in order to prove the existence and the uniqueness of solution for such class of systems by mean of contraction mapping principle. The third part of the thesis concerns the transformation of an extrusion process mass balance equations into a particular input delay system framework using characteristics method. Then, the stabilization of the moving interface by a predictor-based controller has been proposed. Finally, an extension of the analysis of moving interface problems to a particular class of systems of conservations laws has been developed. Port-Hamiltonian formulation of systems of two conservation laws defined on two complementary time-varying intervals has been studied. It has been shown that the coupled system is a port-Hamiltonian system augmented with two variables being the characteristic functions of the two spatial domains
Cardoso-Ribeiro, Flávio Luiz. "Modélisation et commande d’interaction fluide-structure sous forme de système Hamiltonien à ports : Application au ballottement dans un réservoir en mouvement couplé à une structure flexible". Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0039/document.
Texto completoThis thesis is motivated by an aeronautical issue: the fuel sloshing in tanksof very flexible wings. The vibrations due to these coupled phenomena can lead to problemslike reduced passenger comfort and maneuverability, and even unstable behavior. Thisthesis aims at developing new models of fluid-structure interaction based on the theory ofport-Hamiltonian systems (pHs). The pHs formalism provides a unified framework for thedescription of complex multi-physics systems and a modular approach for the coupling ofsubsystems thanks to interconnection ports. Furthermore, the design of controllers using pHsmodels is also addressed. PHs models are proposed for the equations of liquid sloshing based on 1D and 2D SaintVenant equations and for the equations of structural dynamics. The originality of the workis to give pHs models of sloshing in moving containers. The interconnection ports are used tocouple the sloshing dynamics to the structural dynamics of a beam controlled by piezoelectricactuators. After writing the partial differential equations of the coupled system using thepHs formalism, a finite-dimensional approximation is obtained by using a geometric pseudospectralmethod that preserves the pHs structure of the infinite-dimensional model at thediscrete level. The thesis proposes several extensions of the geometric pseudo-spectral method,allowing the discretization of systems with second-order differential operators and with anunbounded input operator. Experimental tests on a structure made of a beam connected to atank were carried out to validate both the pHs model of liquid sloshing in moving containersand the pseudo-spectral semi-discretization method. The pHs model was finally used to designa passivity-based controller for reducing the vibrations of the coupled system
Romero, Velázquez José Guadalupe. "Commande robuste par façonnement d'énergie de systèmes non-linéaires". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00797371.
Texto completoFalaize, Antoine. "Modélisation, simulation, génération de code et correction de systèmes multi-physiques audios : approche par réseau de composants et formulation Hamiltonienne à Ports". Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066544.
Texto completoThe class of audio systems includes traditional musical instruments (percussion, string, wind, brass, voice) and electro-acoustic systems (guitar amplifiers, analog audio processing, synthesizers). These multi-physical systems have a common property: out of excitation sources (generators), they are all passive. We present a set of automatic methods dedicated to their modeling, simulation and control, which explicitly guarantee and exploit the passivity of the original system. This class of systems is that of port-Hamiltonian systems (PHS), introduced in system theory in the early 1990s. Regarding the models, we exploit the fact that the interconnection of systems described in this formalism explicitly preserves the dynamics of total dissipated power. This enabled the development of an automated method that builds models of complete instruments based on a dictionary of elementary models. Regarding the simulations, we developed a numerical method that preserves the passive structure of PHS in discrete-time domain. This ensures the stability of simulations (for which the C++ code is automatically generated). Regarding the control, we exploit the interconnection structure to automatically build an input-to-output decoupled form for a class of PHS. Systems of this class are flat, within the meaning of the differential flatness approach. A formula that yields the (open loop) control law for these systems is provided
Liu, Ning. "Modélisation Hamiltonienne à ports et commande distribuée de structures flexibles : application aux endoscopes biomédicaux à actionneurs à base de polymère électro-actif". Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCD054.
Texto completoThis thesis deals with the multiphysical modeling and the distributed control of flexible structures actuated by Ionic Polymer Metal Composite (IPMC) actuators. We firstly propose a model for the IPMC actuator using infinite dimensional port-Hamiltonian formulations in order to tackle the multiphysical and multiscale couplings. Lagrange multipliers are used to handle the mechanical constraints appearing in the actuator. The mechanical structure of the flexible structure is then modeled in 1D with beam models and in 2D with a thin shell model. Secondly, two structure preserving discretization methods are presented and extended to infinite dimensional dissipative port-Hamiltonian system with distributed input. The proposed IPMC actuator model is then discretized using the structure preserving finite differences method on staggered grids and validated on experimental data. Thirdly, we propose an in-domain distributed control law on a simplified model i.e. the vibrating string actuated with patches, that allows to shape the total energy of the system and to inject damping in order to stabilize the overall system with predefined performances
Falaize, Antoine. "Modélisation, simulation, génération de code et correction de systèmes multi-physiques audios : approche par réseau de composants et formulation Hamiltonienne à Ports". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066544/document.
Texto completoThe class of audio systems includes traditional musical instruments (percussion, string, wind, brass, voice) and electro-acoustic systems (guitar amplifiers, analog audio processing, synthesizers). These multi-physical systems have a common property: out of excitation sources (generators), they are all passive. We present a set of automatic methods dedicated to their modeling, simulation and control, which explicitly guarantee and exploit the passivity of the original system. This class of systems is that of port-Hamiltonian systems (PHS), introduced in system theory in the early 1990s. Regarding the models, we exploit the fact that the interconnection of systems described in this formalism explicitly preserves the dynamics of total dissipated power. This enabled the development of an automated method that builds models of complete instruments based on a dictionary of elementary models. Regarding the simulations, we developed a numerical method that preserves the passive structure of PHS in discrete-time domain. This ensures the stability of simulations (for which the C++ code is automatically generated). Regarding the control, we exploit the interconnection structure to automatically build an input-to-output decoupled form for a class of PHS. Systems of this class are flat, within the meaning of the differential flatness approach. A formula that yields the (open loop) control law for these systems is provided
Lebrun, Tristan. "Modélisation multi-physique passive, identification, simulation, correction et asservissement de haut-parleur sur des comportements cibles". Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS686.
Texto completoThis thesis concerns electrodynamic loudspeaker modeling, simulation and control. Regarding modeling, we adopt a component-based approach that relies on port-Hamiltonian systems. Several linear and nonlinear phenomena are thus modeled and then aggregated in a multi-physical framework. Particular attention is paid to the impact of thermal effects on electrical and mechanical components, for which we introduce new irreversible conservative models. The simulations regenerate known complex behaviors. A first open-loop control is developed to eliminate distortions by differential flatness. In order to provide the controller with the model's nonlinearity parameters, an ad hoc estimation method is proposed. This combines a separation of the measurement into sub-signals (organized in a homogeneous order of non-linearity) and the optimization of a cost function (improving the contrast between orders). After numerical validation, estimation and control methods are applied on a test bench. The estimated physical parameters are consistent but the re-simulated time signals indicate the need of improvement of the model at very low frequency and to use higher homogeneous orders. The real-time corrector leads to a measurable reduction of the distortions on the sound pressure. In addition, another open-loop control is developed to compensate for the Doppler effect due to the movement of the membrane. Finally, methods on closed-loop control are proposed. One targets acoustic absorption by combining "control law in finite time" (for efficiency) and "passivity" (for robustness). The other, more general, develops an "half-physical, half-digital" method of connection between a physical system and a digital controller that makes the passivity insensitive to the delay introduced by the digital signal processor
Borja, Rosales Luis Pablo. "Stabilization of a class of nonlinear systems with passivity properties". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS179/document.
Texto completoIn this thesis we address the problem of stabilization of nonlinear systems. In particular, we focus on models where the energy plays a fundamental role. This energy-based framework is suitable to capture the phenomena of several physical domains, such as mechanical systems, electrical systems, hydraulic systems, etc. The starting point in the proposed controllers are the concepts of passive system, passive outputs and energy (storage) functions. In this work we study two classes of dynamical systems, namely port-Hamiltonian (PH) and Euler-Lagrange (EL), which are suitable to represent many physical processes. A first step towards the controller design is to show the passivity of the PH systems and the characterization of their passive outputs. Thereafter, we explore the use of the different passive outputs in two well-known passivity-based control (PBC) techniques, that is control by interconnection (CbI) and energy balancing (EB), and we compare the obtained results in both approaches. In addition, we propose a novel methodology in which the controller consists in a proportional (P), an integral (I) and, possibly, a derivative (D) term of the passive output. In this approach the energy of the closed-loop system is shaped without the necessity of solving partial differential equations (PDEs). We analyze the scenario of the PID controller using the different passive outputs previously characterized. Finally, we apply a PID-PBC scheme recently proposed in the literature to a complex mechanical system, namely an ultra flexible inverted pendulum, which is represented as a constrained EL model. The controller design, the stability proof, as well as simulations and experimental results are presented to show the applicability of this technique to physical systems
Zhou, Weijun. "Approche thermodynamique pour la commande d’un système non linéaire de dimension infinie : application aux réacteurs tubulaires". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10084/document.
Texto completoThe main objective of this thesis consists to investigate the problem of modelling and control of a nonlinear parameter distributed thermodynamic system : the tubular reactor. We address the control problem of this non linear system relying on the thermodynamic properties of the process. This approach requires to use the classical extensive variables as the state variables. We use the thermodynamic availability as well as the reduced thermodynamic availability (this function is formed from some terms of the thermodynamic availabilty) as Lyapunov functions in order to asymptotically stabilize the tubular reactor aroud a steady profile. The distributed temperature of the jacket is the control variable. Some simulations illustrate these results as well as the eficiency of the control in presence of perturbations. Next we study the Port Hamiltonian representation of irreversible infinite dimensional systems. We propose a Stokes-Dirac structure of a reaction-diffusion system by means of the extension of the vectors of the flux and effort variables. We illustrate this approach on the example of the reaction-diffusion system. For this latter we use the internal energy as well as the opposite of the entropy to obtain Stokes-Dirac structures. We propose also a pseudo-Hamiltonian representation for the two Hamiltonians. Finally we tackle the boundary control problem. The objective is to study the existence of solutions associated to a linearized model of the tubular reactor controlled to the boundary
Gibart, Jules. "Non-linear stability of a liquid propelled rocket engine in closed loop regulation". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST110.
Texto completoWith the development of reusable rocket engines, the operating requirements of the various components in an engine have significantly increased. While a non-reusable engine was designed for a limited number of operating points, a reusable engine must meet requirements over a wide range of points to perform complex maneuvers. Consequently, rocket engine control laws have evolved similarly, with the introduction of closed-loop control laws. Although many studies have been conducted on control laws, few works focus on the stability of the engine in closed-loop control. In this context, the objective of this work is to propose a demonstration of the stability of a rocket engine model, as well as a controller that guarantees the stability of the model. First, a model of a liquid propelled rocket engine is proposed under a state-space form. Although more common, this type of modeling does not allow for an easy stability analysis due to its highly nonlinear terms. In this context, the use of a Lyapunov function proves to be cumbersome, and a reformulation of the model is considered, in the form of a Port-Hamiltonian model, more suited for stability analysis of the system. A second chapter introduces the concept of the Port-Hamiltonian model. This type of model highlights the energy transfers that occur between the various components of a system and is built with a fixed geometric structure. These characteristics allow for a direct study of the passivity of a system, a tool for stability analysis the stability. The reformulation allows for the identification of a characteristic function of a Port-Hamiltonian system, the Hamiltonian function, which can be used to prove the passivity of a system and can be formulated as a Lyapunov function. This demonstration provides stability conditions for the system as well as the controller applied in the closed-loop system. In cases where a direct demonstration of passivity is not possible, a controller can be constructed to ensure the passivity of the closed-loop system. To endow the rocket engine model with passivity properties, the third chapter presents passivity-based control (PBC) theory. The principle of such a controller is to ensure the stability of a system by making the closed-loop system passive. Coupled with Port-Hamiltonian systems theory, however, this controller also allows for modification of the Hamiltonian geometric structure to reformulate a system into Port-Hamiltonian form. This controller makes the system passive around a desired operating point, which can be changed over time. Thus, this controller enables trajectory tracking with passivity guarantees over time. The fourth chapter proposes a different approach to establish a stabilizing controller using contraction theory. The contraction property of a system indicates its ability to rapidly converge towards a reference trajectory. This property represents a form of exponential stability, which is more robust than stability through passivation. Moreover, the controller can be easily implemented by solving linear matrix inequalities. Finally, the results of this work are presented through simulations on MATLAB Simulink, allowing for conclusions on the various controllers presented. A simple proportional-integralderivative (PID) controller is constructed for comparison. The results show that the designed controllers offer stabilizing properties, while the PID controller is unstable in certain operating regions. The passivity-based controller extends the stability domain of the system, and the contraction-based controller prevents the system from leaving the stability domain of the original system
Aoues, Saïd. "Schémas d'intégration dédiés à l'étude, l'analyse et la synthèse dans le formalisme Hamiltonien à ports". Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0121/document.
Texto completoThis thesis work dealing with finite dimensional approximation of infinite dimension system. The class considered is that of Hamiltonian systems in ports. We study initially ordinary differential equations systems. Based on an energy integrator, we define a class of discrete passive dynamics is invariant interconnection. We obtain the stability conditions (LMI) for dynamic network in the presence of delays and uncertainties, and propose a method of stabilizing energy synthesis. These developments were experimentally validated by the implementation of an energy control a power converter (Buck). We then study the Hamiltonian formalism in infinite dimensions. We offer an approximation that combines a semi-discretization and an energy integrator. The mixed composability is studied and a method of synthesis IDA-PBC was developed. All the obtained results are numerically illustrated in the manuscript
Makkar, Mohit. "Modélisation et commande passive des bioréacteurs continus : application aux réactions enzymatiques et microbiennes". Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10068/document.
Texto completoThis thesis proposes a passivity based formulation and control of a well-mixed CSTR model for a set of chemical and biochemical reactions taking place at constant pressure and temperature. Special care has been taken to not look loosely on the physical coherence of a system by using meaningful energy functions as Lyapunov functions and using the structure of the model while performing the control. It is made clear that Gibbs free energy is an apt Hamiltonian function for such cases. The Bond Graph models related to Port-Hamiltonian formulation for both types of reactions are given in order to show its ability of pictorial representation and intuitive solution. An energy based model of such systems is proposed which can be said as quasi Port-Hamiltonian system (PHS) based on physical grounds. The model is taking care of the concentration space and reaction space of a chemical reaction. Stoichiometric and Reaction interconnection and damping assignment passivity based controllers (IDA-PBC) are derived from the proposed Stoichiometric and Reaction energy based models respectively by physically giving the energy function a desired form. Real application of enzymatic hydrolysis of cellulose in continuous reactor is simulated.Then, a passivity based model of a general set of microbial reactions in open reactors with new Lyapunov functions is derived. A useful change of coordinates is done which simplifies the number of equations to be taken care of and shows directly the passivity of the system. The passivity based control is obtained from systematic controller design techniques. The Lyapunov functions can be said to be in close proximity with the Gibbs free energy function used in Port-Hamiltonian model of enzymatic reactions and are far from the traditional non-physical quadratic functions. A general method of generating an adaptive passivity based control law with the new model which is more physical and maintains the structure of the model has been generated. Application and validation of the model through simulations is done on single and multiple reaction examples. To explore the pseudo-energetic point of view towards modeling and control of microbial reactions in open reactors with parametric uncertainty, different candidate energy functions are being tested and an adaptive controller is designed to cope with uncertainties on the specific growth rate
Perodou, Arthur. "Frequency design of passive electronic filters : a modern system approach". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC046.
Texto completoThe current explosion of communicating devices (smartphones, drones, IoT...), along with the ever-growing data to be transmitted, produces an exponential growth of the radiofrequency bands. All solutions devised to handle this increasing demand, such as carrier aggregation, require to synthesise frequency filters with stringent industrial requirements (performance, energy consumption, cost ...). While the technology of acoustic wave (AW) resonators, that seem to be the only passive micro-electronic components available to fulfil these requirements, is mature, the associate design problem becomes dramatically complex. Traditional design methods, based on the intuition of designers and the use of generic optimisation algorithms, appear very limited to face this complexity. Thus, systematic and efficient design methods need to be developed. The design problem of AW filters happens to be an instance of the more general design problem of passive electronic filters, that played an important role in the early development of Linear Control and System theory. Systematic design methods were developed in particular cases, such as for LC-ladder filters, but do not enable to tackle the case of AW filters. Our aim is then to revisit and generalise these methods using a modern System approach, in order to develop systematic and efficient design methods of passive electronic filters, with a special focus on AW filters. To achieve this, the paradigm of convex optimisation, and especially the sub-class of Linear Matrix Inequality (LMI) optimisation, appears for us a natural candidate. It is a powerful framework, endowed with efficient solvers, able to optimally solve a large variety of engineering problems in a low computational time. In order to link the design problem with this framework, it is proposed to use modern tools such as the Linear Fractional Transformation (LFT) representation and a mathematical characterisation coming from Dissipative System theory. Reviewing the different design methods, two design approaches stand out. The first approach consists in directly tuning the characteristic values of the components until the frequency requirements are satisfied. While very flexible and close to the original problem, this typically leads to a complex optimisation problem with important convergence issues. Our first main contribution is to make explicit the sources of this complexity and to significantly reduce it, by introducing an original representation resulting from the combination of the LFT and the Port-Hamiltonian Systems (PHS) formalism. A sequential algorithm based on LMI relaxations is then proposed, having a decent convergence rate when a suitable initial point is available. The second approach consists of two steps. First, a transfer function is synthesised such that it satisfies the frequency requirements. This step is a classical problem in Control and Signal Processing and can be efficiently solved using LMI optimisation. Second, this transfer function is realised as a passive circuit in a given topology. To this end, the transfer function needs to satisfy some conditions, namely realisation conditions. The issue is to get them with a convex formulation, in order to keep efficient algorithms. As this is generally not possible, an idea is to relax the problem by including common practices of designers. This leads to solve some instances of a general problem denoted as frequency LFT filter synthesis. Our second main contribution is to provide efficient synthesis methods, based on LMI optimisation, for solving these instances. This is achieved by especially generalising the spectral factorisation technique with extended versions of the so-called KYP Lemma. For particular electronic passive filters, such as bandpass LC-ladder filters, this second approach allows to efficiently solve the design problem. More generally, it provides an initial point to the first approach, as illustrated on the design of a particular AW filter
Hoang, Ngoc Ha. "Approche thermodynamique pour la stabilisation des réacteurs chimiques". Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10244.
Texto completoThe goal of this thesis is to propose new nonlinear control strategies for the stabilization of perfectly Continuous Stirred Tank Reactors (CSTR). To achieve this goal, we use on the one hand, the entropic thermodynamic approach. More precisely, we use the thermodynamic availability concept and the properties of irreversible thermodynamics to define a Lyapunov function candidate for the stabilization of the closed loop system. We also propose a reduced availability function to design more efficient feedback laws in term of control variable solicitations. On the other hand, we propose an extension of the (pseudo) Hamiltonian formalism associated to dissipative systems to open chemical reactors. We show that the Hamiltonian is linked to the Gibbs free enthalpy in the isothermal case and to ectropy (opposed to entropy) in the non isothermal case. By this formalism, the dissipation of the system represents the irreversible entropy production due to chemical reaction. The Interconnection and Damping Assignment-Passivity Based Control (IDA-PBC) approach is then applied to synthesize feedback laws by choosing the thermodynamic availability as desired closed loop hamiltonian storage function. Finally, we show that feedback laws synthetized by the entropic thermodynamic approach and the pseudo-hamiltonian formulation are equivalent in some cases. Some stabilization properties and the control input admissibility are also considered. Theoretical developments are illustrated on some different CSTR examples : an academic case study and the acid catalyzed hydration of oxirane-methanol to glycerol
Vu, Ngoc Minh Trang. "Approche hamiltonienne à ports pour la modélisation, la réduction et la commande des dynamiques des plasmas dans les tokamaks". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT067/document.
Texto completoThe modelling and analysis of the plasma dynamics in tokamaks using the port-Hamiltonian approach is the main project purpose. Thermo-mMagnetohydrodynamics balances have been written in port-Hamiltonian form using Stokes-Dirac interconnection structures and 3D differential forms. A simplified 1D model for control has been derived using quasi-static and symmetry assumptions. It has been proved to be equivalent to a classical 1D control model: the resistive diffusion model for the poloidal magnetic flux. Then a geometric spatial integration scheme has been developped. It preserves both the symplecticity of the Dirac interconnection structure and physically conserved extensive quantities. This will allow coming works on energy-based approaches for the non linear control of the plasma dynamics.An Interconnection and Damping Assignment - Passivity Based Control (IDA-PBC) , the most general Port-Hamiltonian control, is chosen first to deal with the studied Tokamak system. It is based on a model made of the two coupled PDEs of resistive diffusion for the magnetic poloidal flux and of radial thermal diffusion. The used TMHD couplings are the Lorentz forces (with non-uniform resistivity) and the bootstrap current. The loop voltage at the plasma boundary, the total external current and the plasma heating power are considered as controller outputs. Due to the actuator constraints which imply to have a physically feasible current profile deposits, a feedforward control is used to ensure the compatibility with the actuator physical capability. Then, the IDA-PBC controllers, both finite-dimensional and infinite-dimensional, are designed to improve the system stabilization and convergence speed. The proposed works are validated against the simulation data obtained from the Tore-Supra WEST (CEA/Cadarache, France) test case and from RAPTOR code for the TCV real-time control system (CRPP/ EPFL, Lausanne, Switzerland)
Efstathiou, Konstantinos. "Métamorphoses de systèmes Hamiltoniens avec symétries". Littoral, 2004. http://www.theses.fr/2004DUNK0101.
Texto completoIn this work we study four classical Hamiltonian systems with discrete or continuous symmetries using methods and techniques that have been developed in the last decades. Three of these systems are Hamiltonian families which model molecular and atomic systems. These systems are the triply degenerate vibrational mode of tetrahedral molecules, the hydrogen atom in crossed electric and magnetic fields and the floppy molecule LiCN. The hydrogen atom is described naturally as a two parameter family where the parameters are the strengths of the two fields. The other two physical systems are described as specific members of more general parametric families. We use normalization (when appropriate) and reduction in order to reduce the number of degrees of freedom of these families. We focus on certain qualitative characteristics of these systems, namely, relative equilibria, Hamiltonian Hopf bifurcations and monodromy and the metamorphoses of these characteristics in different parameter regions. The fourth system is a perturbation of two harmonic oscillators in 1:-2 resonance. Such a system may describe the dynamics in the neighbourhood of an equilibrium of a two degree of freedom Hamiltonian. For this system we give an analytic proof of the existence of fractional monodromy, which is a radical generalization of standard monodromy
Cresson, Jacky. "Propriétés d'instabilité des systèmes Hamiltoniens proches de systèmes intégrables". Observatoire de Paris, 1997. https://hal.archives-ouvertes.fr/tel-02071388.
Texto completoThe purpose of this thesis is to study instability properties of near-integrable Hamiltoniens systems, in particular Arnold’s diffusion. We first describe the phase-space near a partially hyperbolic torus and along a transition chain. We prove that hyperbolic tori, which come from the destruction of resonant tori, are transition tori. We then show that transvers homoclinic partially hyperbolic tori possess a symbolic dynamics. These results allow us to prove the existence of instability’s orbits along a chain as well as periodic orbits of arbitrarily hight period as conjectured by Homes-Marsden. Second, we estimate the time of drift along a chain by geometrical methods. We precise the role of the splitting size, ergodisation time… We prove that for initially hyperbolic Hamiltonian systems this time of drift is polynomial. Our method is general and applies on abstract chain of tori, which is not the case of variational methods. Last, we apply our result on specific examples. We first describe a class of systems, which always possess transition chain. We then show that this class contains a lot of classical systems as the three body problem, Rydberg’s atom…
Moya, Arranz Paloma. "Commande adaptative des systèmes non linéaires non linéairement paramétrisés : application aux systèmes de réaction". Paris 11, 2004. http://www.theses.fr/2004PA112140.
Texto completoBrousseau, Vincent. "Sur les index de systèmes hamiltoniens linéaires". Paris 9, 1985. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1985PA090010.
Texto completoNguyen, Van Minh. "Géométrie des systèmes dynamiques non-hamiltoniens intégrables". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1688/.
Texto completoThis thesis is dedicated to a systematic study of the geometry of integrable non-Hamiltonian systems of type (n,0) on n-manifolds and of type (1,1) on 2-dimensional surfaces. We describe the local and global invariants, associated geometric structures (e. G. Toric manifolds, singular affine structures, reflection groups), and obtain existence and classification results
Chouhab, Khaled. "Intégrabilité et périodes des systèmes dynamiques hamiltoniens". Pau, 1995. http://www.theses.fr/1995PAUU3021.
Texto completoBounemoura, Abed. "Stabilité et instabilité des systèmes hamiltoniens presque-intégrables". Paris 11, 2010. http://www.theses.fr/2010PA112101.
Texto completoThis thesis is devoted to various questions concerning the stability and instability of near-integrable Hamiltonian systems. In a first part, we give an informal introduction to Hamiltonian systems and to the perturbation theory of integrable Hamiltonian systems in the first chapter, and then, in the second chapter, we state our results. A second part is devoted to stability results. In the third chapter, we give a new proof of the exponential stability theorem of Nekhoroshev in the generic case for an analytic system. Our method uses only composition of periodic averaging, and therefore it avoids the small divisors problem. Then, in the fourth chapter, we take advantage of this approach to obtain new results of exponential and super-exponential stability in the neighbourhood of elliptic fixed points, invariant Lagrangian quasi-periodic tori and more generally invariant linearly stable quasi-periodic tori, which are isotropic and reducible. In the fifth chapter, for a quasi-convex integrable Hamiltonian system, we also prove a result of polynomial stability in the case where the system is only finitely differentiable. A third part lies between stability and instability. In the sixth chapter, for a quasi-convex system which is analytic or Gevrey, we improve the stability exponent by studying the geometry of simple resonances. Thus we obtain a time of stability which is closer to the known instability times, and which is certainly optimal. In the fourth part, we will construct examples of unstable Hamiltonian systems. First, in the seventh chapter, we give a new example of an \textit{a priori} unstable system which has a drifting orbit with an optimal time of instability. Our method uses the symbolic dynamics created by the transverse intersection between the stable and unstable manifolds of a normally hyperbolic invariant manifold. In the eighth and last chapter, we also construct an example of a near-integrable Hamiltonian system, for which the size of the perturbation goes to zero only when the number of degrees of freedom goes to infinity, and which has an orbit drifting in a polynomial time. In particular, this gives a new constraint on the threshold of validity for exponential stability results
Lassoued, Aidi Leila. "Contribution à l'étude des solutions périodiques de systèmes hamiltoniens". Paris 9, 1987. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1987PA090022.
Texto completoRouaissi, Ahmed. "Sur les systèmes hamiltoniens du type de Calogero". Paris 6, 1992. http://www.theses.fr/1992PA066596.
Texto completoWu, Yongxin. "Passivity preserving balanced reduction for the finite and infinite dimensional port Hamiltonian systems". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10278/document.
Texto completoIn this thesis we have developed different structure preserving reduction methods for finite and infinite dimensional port Hamiltonian systems by using a balanced model reduction approach. In the first part we have defined a descriptor representation of port Hamiltonian systems with constraints. The balanced realization of the descriptor system has been used for reducing the port Hamiltonian descriptor system and conserving explicitly the constraint equations. In the second part, conditions have been derived on the weighting matrices of the LQG control problem such that the dynamical LQG controller is passive and has a port Hamiltonian realization. Two passive LQG control design methods have been suggested and one of them allows us to define a LQG balanced realization. Based on this realization, the effort constraint method has been used to reduce the LQG balanced port Hamiltonian system and obtain a reduced order passive LQG controller. In this way the closed-loop system is derived from the interconnection of 2 port Hamiltonian systems, hence the Hamiltonian structure has been preserved. In the third part, the proceeding results have been extended to a class of infinite dimensional port Hamiltonian system with bounded input operator. A passive LQG control design method for infinite dimensional port Hamiltonian system has been derived as by Control by Interconnection (CbI). Based on the balanced realization associated with this passive LQG control design, a finite dimensional approximation has been achieved and a reduced order passive LQG controller has been derived. As a consequence, the system in closed-loop with this reduced order LQG controller again admits a port Hamiltonian structure and satisfies the passivity
Ouazzani-Jamil, Mohammed. "Intégrabilité algébrique et analyse topologique du potentiel de Kolossoff". Pau, 1993. http://www.theses.fr/1993PAUU3016.
Texto completoSéré, Eric. "Problèmes variationnels avec défaut de compacité et orbites homoclines de systèmes hamiltoniens". Paris 9, 1993. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1993PA090013.
Texto completoViterbo, Claude. "Une théorie de Morse pour les systèmes hamiltoniens étoilés". Paris 9, 1985. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1985PA090006.
Texto completoRanty, François. "Systèmes hamiltoniens convexes présentant une intégrale première non triviale". Paris 9, 1987. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1987PA090018.
Texto completoBernard, Patrick. "Recherche variationnelle d'orbites homoclines dans les systèmes dynamiques hamiltoniens". Paris 9, 2000. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2000PA090036.
Texto completoMajnani, Azeddine. "Contribution a l'étude des solutions périodiques d'un système hamiltonien par un algorithme de calcul de la stabilité". Pau, 1987. http://www.theses.fr/1987PAUU3008.
Texto completoCassanas, Roch. "Hamiltoniens quantiques et symétries". Phd thesis, Université de Nantes, 2005. http://tel.archives-ouvertes.fr/tel-00009289.
Texto completoVeeravalli, Alain. "Compactification d'actions de IRn et systèmes hamiltoniens de type torique". Montpellier 2, 1993. http://www.theses.fr/1993MON20213.
Texto completoXu, Haiyan. "Sur certains systèmes hamiltoniens liés à l’équation de Szegő cubique". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112159/document.
Texto completoThe main purpose of this Ph.D. thesis is to study the long time behavior of solutionsto some Hamiltonian PDEs, i∂_t u=X_H (u), including global existence, growth of high Sobolev norms, scattering and long time approximation by resonant dynamics.In this context, at first we consider the Szegő equation on the circle S1 perturbed bya linear potential, i∂_t u=∏ |u|² u+α∫ u,α∈R, (α-Szegő) where ∏ is the projector onto the non-negative frequencies. For α=0, it turns out tobe the cubic Szegő equation, which was recently introduced by Gérard and Grellier as amathematical toy model of a non-linear totally non dispersive equation.We study the global well-posedness, the integrability and the dynamics of the singularvalues of the related Hankel operators of the α –Szegő equation. Moreover, we establishthe following properties for this equation on a class of invariant submanifolds, with anarbitrary large dimension. For α<0, any trajectory is relatively compact, and all theSobolev norms are bounded on it. For α>0, there exist trajectories on which everySobolev norm of regularity s>½ , exponentially tends to infinity in time.Second, we study the wave-guide Schrödinger equation posed on the spatial domain(x,y)∈R×T ,i∂_t U+∂_xx U-|D_y |U=|U|² U,(WS)Adapting an idea by Hani–Pausader–Tzvetkov–Visciglia, we establish a modified scattering theory between small solutions to this equation and small solutions to the cubic Szegő equation. Combining this scattering theory with a recent result by Gérard–Grellier, we infer existence of global solutions to (WS) which are unbounded in the space L_x^2 H_y^s (R×T) for every s>½
Pang, Shengzhao. "Contribution to Stability Analysis and Stabilization of DC Microgrids : Application of the Concept of Passivity". Electronic Thesis or Diss., Université de Lorraine, 2020. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0121_PANG.pdf.
Texto completoThis dissertation focuses on dealing with the stability issues of DC microgrids, especially in electrified transportation applications. The main objective of this dissertation is to solve problems and find improvements related to the stability analysis and stabilization of DC microgrids. In the applications under consideration, stability is still a key issue in the design of DC microgrids. These systems, mainly consisting of multiple cascaded and/or parallel converters and LC filters, can suffer from instability, even when individual converters are stable alone. Moreover, DC microgrids in electrified transportation applications may have a time-varying structure, with highly flexible subsystems and operating modes. Both sources and loads can switch their operation patterns, or even join or quit the microgrid in a plug-and-play manner. This feature makes it difficult to conduct the stability studies, and puts forward higher requirements for controller design. To consider the aforementioned issues, the concept of passivity is studied in this dissertation. Indeed, the general stability study is established using the passivity concept which ensures that a microgrid is stable as long as all its components meet the passivity conditions and are interconnected to each other under certain conditions. In this way, the stabilization objective is localized to avoid investigating the whole microgrid, thereby offering immunity against system variations. Initially, a branch of Passivity-Based Control (PBC), i.e. the Interconnection and Damping Assignment Passivity-Based Control (IDA-PBC), is applied to two typical DC/DC converters. This is achieved by designing an adaptive interconnection matrix to establish internal links in Port-Controlled Hamiltonian (PCH) models and to generate a unique control law. Then, the stabilization of DC microgrids is achieved by developing a modified IDA-PBC at the subsystem level. The instability effects caused by the LC filter, and also caused by the interaction between subsystems are taken into account in the controller design. Moreover, a nonlinear observer is added to the PBC controller to solve the effect caused by parameter and model uncertainties. Afterward, a passivation strategy is proposed to stabilize DC microgrids. This is achieved by developing a PBC controller that preserves the passivity property from the interconnection perspective. All the proposed PBC theory and estimation technology can guarantee the large-signal stability of the DC microgrid. In addition to these theoretical backgrounds, the proposed control methods are validated by extensive simulation, experimental, and Hardware-in-the-loop (HIL) results
Bolle, Philippe. "Etude des solutions périodiques de certains systèmes hamiltoniens : systèmes ayant des intégrales premières non triviales. Problème du billard". Paris 9, 1994. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1994PA090003.
Texto completoLoiseau, Jean-Francis. "Contribution a l'étude des solutions exactes et approchées de l'Oscillateur anharmonique monomial en mécanique classique". Pau, 1986. http://www.theses.fr/2006PAUU3029.
Texto completoBouloc, Damien. "Géométrie et topologie de systèmes dynamiques intégrables". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30099/document.
Texto completoIn this thesis, we are interested in two different aspects of integrable dynamical systems. The first part is devoted to the study of three families of integrable Hamiltonian systems: the systems of bending flows of Kapovich and Millson on the moduli spaces of 3D polygons with fixed side lengths, the Gelfand-Cetlin systems introduced by Guillemin and Sternberg on the coadjoint orbits of the Lie group U(n), and a family of integrable systems defined by Nohara and Ueda on the Grassmannian Gr(2,n). In each case we prove that the fibers of the momentum map are embedded submanifolds for which we give geometric models in terms of quotients manifolds. In the second part we carry on with a study initiated by Zung and Minh of the totally hyperbolic actions of R^n on compact n-dimensional manifolds that appear naturally when investigating integrable non-hamiltonian systems with nondegenerate singularities. We study the flow generated by the action of a generic vector in Rn. We define a notion of index for its singularities and we use this flow to obtain results on the number of orbits of given dimension. We investigate further the 2-dimensional case, and more particularly the case of the sphere S2, where the orbits of the action draw an embedded graph of which we analyse the combinatorics. Finally, we provide explicit examples of totally hyperbolic actions in dimension 3, on the sphere S3 and on the projective space RP3