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https://sam.ensam.eu:443
The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sat, 15 Jun 2024 20:33:33 GMT2024-06-15T20:33:33ZModeling of inertial and compliance parametric uncertainties in Port-Hamiltonian systems using LFR
http://hdl.handle.net/10985/9774
Modeling of inertial and compliance parametric uncertainties in Port-Hamiltonian systems using LFR
TOURON, Matthieu; DIEULOT, Jean-Yves; BARRE, Pierre-Jean; GOMAND, Julien
This paper presents a Linear Fractional Representation of a Port Hamiltonian System for which uncertainties are concentrated on the Hamitonian parameters. A basic block-diagram is provided and an illustration is shown on a hand-held cutting tool viewed as an effort multiplier.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/97742013-01-01T00:00:00ZTOURON, MatthieuDIEULOT, Jean-YvesBARRE, Pierre-JeanGOMAND, JulienThis paper presents a Linear Fractional Representation of a Port Hamiltonian System for which uncertainties are concentrated on the Hamitonian parameters. A basic block-diagram is provided and an illustration is shown on a hand-held cutting tool viewed as an effort multiplier.Instability Mechanism of Roll/Lateral Biodynamic Rotorcraft–Pilot Couplings
http://hdl.handle.net/10985/17395
Instability Mechanism of Roll/Lateral Biodynamic Rotorcraft–Pilot Couplings
MUSCARELLO, Vincenzo; MASARATI, Pierangelo; QUARANTA, Giuseppe; TOD, Georges; PAVEL, Marilena; GOMAND, Julien; MALBURET, François
The paper investigates the basic mechanism of aeroservoelastic pilot-assisted oscillation about the roll axis due to the interaction with pilot's arm biomechanics. The motivation stems from the observation that a rotor imbalance may occur as a consequence of rotor cyclic lead–lag modes excitation. The work shows that the instability mechanism is analogous to air resonance, in which the pilot's involuntary action plays the role of the automatic flight control system. Using robust stability analysis, the paper shows how the pilot's biodynamics may involuntarily lead to a roll/lateral instability. The mechanism of instability proves that the pilot biodynamics is participating in the destabilization of the system by transferring energy, i.e., by producing forces that do work for the energetically conjugated displacement, directly into the flapping mode. This destabilizes the airframe roll motion, which, in turn, causes lead–lag motion imbalance. It is found that, depending on the value of the time delay involved in the lateral cyclic control, the body couples with rotor motion in a different way. In the presence of small or no time delays, body roll couples with the rotor through the lead–lag degrees of freedom. The increase of the time delay above a certain threshold modifies this coupling: The body no longer couples with the rotor through lead–lag but directly through flap motion.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/173952018-01-01T00:00:00ZMUSCARELLO, VincenzoMASARATI, PierangeloQUARANTA, GiuseppeTOD, GeorgesPAVEL, MarilenaGOMAND, JulienMALBURET, FrançoisThe paper investigates the basic mechanism of aeroservoelastic pilot-assisted oscillation about the roll axis due to the interaction with pilot's arm biomechanics. The motivation stems from the observation that a rotor imbalance may occur as a consequence of rotor cyclic lead–lag modes excitation. The work shows that the instability mechanism is analogous to air resonance, in which the pilot's involuntary action plays the role of the automatic flight control system. Using robust stability analysis, the paper shows how the pilot's biodynamics may involuntarily lead to a roll/lateral instability. The mechanism of instability proves that the pilot biodynamics is participating in the destabilization of the system by transferring energy, i.e., by producing forces that do work for the energetically conjugated displacement, directly into the flapping mode. This destabilizes the airframe roll motion, which, in turn, causes lead–lag motion imbalance. It is found that, depending on the value of the time delay involved in the lateral cyclic control, the body couples with rotor motion in a different way. In the presence of small or no time delays, body roll couples with the rotor through the lead–lag degrees of freedom. The increase of the time delay above a certain threshold modifies this coupling: The body no longer couples with the rotor through lead–lag but directly through flap motion.An Energetic Approach to Aeroelastic Rotorcraft-Pilot Couplings Analysis
http://hdl.handle.net/10985/9458
An Energetic Approach to Aeroelastic Rotorcraft-Pilot Couplings Analysis
TOD, Georges; BARRE, Pierre-Jean; BOUDON, Benjamin; GOMAND, Julien; MALBURET, François
This paper describes an energetic method using multibond graphs to model multi-physical systems. Its potential in building physical meaningful graphs that represent equivalent mathematical models of classic analytical approaches is shown. An application to the study of an aeroelastic rotorcraft-pilot coupling is studied by analyzing the passive pilot behavior in the cyclic control loop. A rotorcraft in hover flight is simulated and perturbed on its rolling motion axis. Depending on the rotorcraft characteristics air resonance may occur, and the pilot may involuntarily excite the cyclic lever, increasing the rolling motion of the fuselage to an unstable point. Future work will explore eventual alternative solutions to notch filters to avoid passive pilot reinjection at low fuselage frequency modes by controlling for example the actuators of the swashplate through model inversion using the bond graph method
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/94582013-01-01T00:00:00ZTOD, GeorgesBARRE, Pierre-JeanBOUDON, BenjaminGOMAND, JulienMALBURET, FrançoisThis paper describes an energetic method using multibond graphs to model multi-physical systems. Its potential in building physical meaningful graphs that represent equivalent mathematical models of classic analytical approaches is shown. An application to the study of an aeroelastic rotorcraft-pilot coupling is studied by analyzing the passive pilot behavior in the cyclic control loop. A rotorcraft in hover flight is simulated and perturbed on its rolling motion axis. Depending on the rotorcraft characteristics air resonance may occur, and the pilot may involuntarily excite the cyclic lever, increasing the rolling motion of the fuselage to an unstable point. Future work will explore eventual alternative solutions to notch filters to avoid passive pilot reinjection at low fuselage frequency modes by controlling for example the actuators of the swashplate through model inversion using the bond graph methodModeling Stiffness and Damping in Rotational Degrees of Freedom Using Multibond Graphs
http://hdl.handle.net/10985/9227
Modeling Stiffness and Damping in Rotational Degrees of Freedom Using Multibond Graphs
TOD, Georges; BARRE, Pierre-Jean; GOMAND, Julien; MALBURET, François
A contribution is proposed for the modeling of mechanical systems using multibond graphs. When modeling a physical system, it may be needed to catch the dynamic behavior contribution of the joints between bodies of the system and therefore to characterize the stiffness and damping of the links between them. The visibility of where dissipative or capacitive elements need to be implemented to represent stiffness and damping in multibond graphs is not obvious and will be explained. A multibond graph architecture is then proposed to add stiffness and damping in hree rotational degrees of freedom. The resulting joint combines the spherical joint multibond graph relaxed causal constraints while physically representing three concatenated revolute joints. The mathematical foundations are presented, and then illustrated through the modeling and simulation of an inertial navigation system; in which stiffness and damping between the gimbals are taken into account. This method is particularly useful when modeling and simulating multibody systems using Newton-Euler formalism in multibond graphs. Future work will show how this method can be extended to more complex systems such as rotorcraft blades' connections with its rotor hub.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/92272013-01-01T00:00:00ZTOD, GeorgesBARRE, Pierre-JeanGOMAND, JulienMALBURET, FrançoisA contribution is proposed for the modeling of mechanical systems using multibond graphs. When modeling a physical system, it may be needed to catch the dynamic behavior contribution of the joints between bodies of the system and therefore to characterize the stiffness and damping of the links between them. The visibility of where dissipative or capacitive elements need to be implemented to represent stiffness and damping in multibond graphs is not obvious and will be explained. A multibond graph architecture is then proposed to add stiffness and damping in hree rotational degrees of freedom. The resulting joint combines the spherical joint multibond graph relaxed causal constraints while physically representing three concatenated revolute joints. The mathematical foundations are presented, and then illustrated through the modeling and simulation of an inertial navigation system; in which stiffness and damping between the gimbals are taken into account. This method is particularly useful when modeling and simulating multibody systems using Newton-Euler formalism in multibond graphs. Future work will show how this method can be extended to more complex systems such as rotorcraft blades' connections with its rotor hub.Efficient energy system modelling for multi-objective optimisation
http://hdl.handle.net/10985/21463
Efficient energy system modelling for multi-objective optimisation
DOUGIER, Nathanael; ROUCOULES, Lionel; GARAMBOIS, Pierre; GOMAND, Julien
Energy systems, on which our modern society rely, are in constant transformation. Technological evolution, climate change or the finitude of fossil fuels are some reasons to rethink the centralized, carbon-based energy networks. This way, the design of future energy systems have to take into account multiple concerns, such as local resilience, in addition to technical and economic ones. This paper presents a decision-support tool for the conception of energy systems focusing on the electric vector. The tool was designed using an energy system model implemented in an optimisation algorithm. It takes into account several constraints simultaneously – equilibrium between production and consumption as well as resources availability – and assess the influence of technical parameters on the global performances of the system. An energy system is considered as a combination of production, storage and transport technologies with their operating strategies. The tool’s modularity allows to choose the models adapted to a quick optimisation of energy systems or to an analysis of technical parameters. The second part of the paper presents the optimisation of a local energy system. Search space is composed of production and storage technologies’ number and their operating strategies. Main goals are to find trade-offs between different economic and technical objective-functions – such as levelized cost of energy or local autonomy. Therefore, a genetic algorithm method was used to perform a multi-objective optimisation based on the model. The impact of the operating strategy adopted is underlined.
Fri, 01 Jan 2021 00:00:00 GMThttp://hdl.handle.net/10985/214632021-01-01T00:00:00ZDOUGIER, NathanaelROUCOULES, LionelGARAMBOIS, PierreGOMAND, JulienEnergy systems, on which our modern society rely, are in constant transformation. Technological evolution, climate change or the finitude of fossil fuels are some reasons to rethink the centralized, carbon-based energy networks. This way, the design of future energy systems have to take into account multiple concerns, such as local resilience, in addition to technical and economic ones. This paper presents a decision-support tool for the conception of energy systems focusing on the electric vector. The tool was designed using an energy system model implemented in an optimisation algorithm. It takes into account several constraints simultaneously – equilibrium between production and consumption as well as resources availability – and assess the influence of technical parameters on the global performances of the system. An energy system is considered as a combination of production, storage and transport technologies with their operating strategies. The tool’s modularity allows to choose the models adapted to a quick optimisation of energy systems or to an analysis of technical parameters. The second part of the paper presents the optimisation of a local energy system. Search space is composed of production and storage technologies’ number and their operating strategies. Main goals are to find trade-offs between different economic and technical objective-functions – such as levelized cost of energy or local autonomy. Therefore, a genetic algorithm method was used to perform a multi-objective optimisation based on the model. The impact of the operating strategy adopted is underlined.Conception architecturale d’un système mécatronique d’assistance à opérateur par Bond - G raph
http://hdl.handle.net/10985/9574
Conception architecturale d’un système mécatronique d’assistance à opérateur par Bond - G raph
TOURON, Matthieu; DIEULOT, Jean-Yves; BARRE, Pierre-Jean; GOMAND, Julien
Les systèmes mécatroniques requièrent une forte intégration physique et fonctionnelle. Pour répondre au premier besoin, l’usage d’un outil de modélisation multiphysique tel que le Bond-Graph est nécessaire. Son extension à la modélisation fonctionnelle est possible si la description informationnelle des échanges fonctionnels peut être mise sous forme d’action- réaction. Les travaux exposés proposent une méthodologie de conception du niveau architectural d’un système mécatronique d’assistance à l’opérateur, basée sur une modélisation multi - physique et multi - domaine (physique et informationnel) de son cahier des charges
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/10985/95742012-01-01T00:00:00ZTOURON, MatthieuDIEULOT, Jean-YvesBARRE, Pierre-JeanGOMAND, JulienLes systèmes mécatroniques requièrent une forte intégration physique et fonctionnelle. Pour répondre au premier besoin, l’usage d’un outil de modélisation multiphysique tel que le Bond-Graph est nécessaire. Son extension à la modélisation fonctionnelle est possible si la description informationnelle des échanges fonctionnels peut être mise sous forme d’action- réaction. Les travaux exposés proposent une méthodologie de conception du niveau architectural d’un système mécatronique d’assistance à l’opérateur, basée sur une modélisation multi - physique et multi - domaine (physique et informationnel) de son cahier des chargesConception architecturale d’un système mécatronique d’assistance à opérateur par Bond-Graph
http://hdl.handle.net/10985/9775
Conception architecturale d’un système mécatronique d’assistance à opérateur par Bond-Graph
TOURON, Matthieu; DIEULOT, Jean-Yves; BARRE, Pierre-Jean; GOMAND, Julien
Les systèmes mécatroniques requièrent une forte intégration physique et fonctionnelle. Pour répondre au premier besoin, l’usage d’un outil de modélisation multi-physique tel que le Bond-Graph est nécessaire. Son extension à la modélisation fonctionnelle est possible si la description informationnelle des échanges fonctionnels peut être mise sous forme d’action-réaction. Les travaux exposés proposent une méthodologie de conception du niveau architectural d’un système mécatronique d’assistance à l’opérateur, basée sur une modélisation multi-physique et multi-domaine (physique et informationnel) de son cahier des charges.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/10985/97752012-01-01T00:00:00ZTOURON, MatthieuDIEULOT, Jean-YvesBARRE, Pierre-JeanGOMAND, JulienLes systèmes mécatroniques requièrent une forte intégration physique et fonctionnelle. Pour répondre au premier besoin, l’usage d’un outil de modélisation multi-physique tel que le Bond-Graph est nécessaire. Son extension à la modélisation fonctionnelle est possible si la description informationnelle des échanges fonctionnels peut être mise sous forme d’action-réaction. Les travaux exposés proposent une méthodologie de conception du niveau architectural d’un système mécatronique d’assistance à l’opérateur, basée sur une modélisation multi-physique et multi-domaine (physique et informationnel) de son cahier des charges.Maximum power point tracking using P&O control optimized by a neural network approach: a good compromise between accuracy and complexity
http://hdl.handle.net/10985/9778
Maximum power point tracking using P&O control optimized by a neural network approach: a good compromise between accuracy and complexity
SAHNOUN, Mohamed Aymen; ROMERO UGALDE, Hector; CARMONA, Jean-Claude; GOMAND, Julien
In the field of power optimization of photovoltaic panels (PV), there exist many maximum power point tracking (MPPT) control algorithms, such as: the perturb and observe (P&O) one, the algorithms based on fuzzy logic and the ones using a neural network approaches. Among these MPPT control algorithms, P&O is one of the most widely used due to its simplicity of implementation. However, the major drawback of this kind of algorithm is the lack of accuracy due to oscillations around the PPM. Conversely, MPPT control using neural networks have shown to be a very efficient solution in term of accuracy. However, this approach remains complex. In this paper we propose an original optimization of the P&O MPPT control with a neural network algorithm leading to a significant reduction of the computational cost required to train it, ensuring a good compromise between accuracy and complexity. The algorithm has been applied to the models of two different types of solar panels, which have been experimentally validated.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/97782013-01-01T00:00:00ZSAHNOUN, Mohamed AymenROMERO UGALDE, HectorCARMONA, Jean-ClaudeGOMAND, JulienIn the field of power optimization of photovoltaic panels (PV), there exist many maximum power point tracking (MPPT) control algorithms, such as: the perturb and observe (P&O) one, the algorithms based on fuzzy logic and the ones using a neural network approaches. Among these MPPT control algorithms, P&O is one of the most widely used due to its simplicity of implementation. However, the major drawback of this kind of algorithm is the lack of accuracy due to oscillations around the PPM. Conversely, MPPT control using neural networks have shown to be a very efficient solution in term of accuracy. However, this approach remains complex. In this paper we propose an original optimization of the P&O MPPT control with a neural network algorithm leading to a significant reduction of the computational cost required to train it, ensuring a good compromise between accuracy and complexity. The algorithm has been applied to the models of two different types of solar panels, which have been experimentally validated.Systemic Approach for Local Energy Mix Assessment
http://hdl.handle.net/10985/21228
Systemic Approach for Local Energy Mix Assessment
DOUGIER, Nathanael; ROUCOULES, Lionel; GARAMBOIS, Pierre; GOMAND, Julien
Whereas energy mainly comes from main national power plants, distributed energy resources and storage technologies would allow local territories to choose their energy sources and increase their autonomy. This paper presents a decision-support tool that propose to find new system architecture based compromises between economic, technical and environmental objectives. Based on a systemic approach, it takes into account a broad range of technologies and assesses multi-scale territories thanks to a physical modelling. Numerical simulations show the influence of different parameters on the ability of a system to balance power demand.
Fri, 01 Jan 2021 00:00:00 GMThttp://hdl.handle.net/10985/212282021-01-01T00:00:00ZDOUGIER, NathanaelROUCOULES, LionelGARAMBOIS, PierreGOMAND, JulienWhereas energy mainly comes from main national power plants, distributed energy resources and storage technologies would allow local territories to choose their energy sources and increase their autonomy. This paper presents a decision-support tool that propose to find new system architecture based compromises between economic, technical and environmental objectives. Based on a systemic approach, it takes into account a broad range of technologies and assesses multi-scale territories thanks to a physical modelling. Numerical simulations show the influence of different parameters on the ability of a system to balance power demand.Multi-physic system simplification method applied to a helicopter flight axis active control
http://hdl.handle.net/10985/8963
Multi-physic system simplification method applied to a helicopter flight axis active control
MARTIN, Mikael; BARRE, Pierre-Jean; GOMAND, Julien; MALBURET, François
A helicopter flight axis control, which is a complex multi-physic system, is modelled using an energetic based graphical tool: the Energetic Macroscopic Representation. Elements of the system are mainly composed of passive technologies and their number tends to increase year after year to improve the pilots comfort by adding new functions. A new methodology is proposed to transform the system into a new active one by replacing some hydro-mechanical elements by a new controllable active mechanical source. The challenge is to simplify the flight control architecture while preserving the global behaviour of the system.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/10985/89632012-01-01T00:00:00ZMARTIN, MikaelBARRE, Pierre-JeanGOMAND, JulienMALBURET, FrançoisA helicopter flight axis control, which is a complex multi-physic system, is modelled using an energetic based graphical tool: the Energetic Macroscopic Representation. Elements of the system are mainly composed of passive technologies and their number tends to increase year after year to improve the pilots comfort by adding new functions. A new methodology is proposed to transform the system into a new active one by replacing some hydro-mechanical elements by a new controllable active mechanical source. The challenge is to simplify the flight control architecture while preserving the global behaviour of the system.