The Experts below are selected from a list of 107046 Experts worldwide ranked by ideXlab platform
Kenneth A. Cunefare - One of the best experts on this subject based on the ideXlab platform.
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Design of a passive Electrical analogue for piezoelectric damping of a plate
Journal of Intelligent Material Systems and Structures, 2017Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Vibrations of a mechanical structure can be reduced through a piezoelectric coupling to a passive Electrical Network exhibiting similar modal properties. For the control of a plate, the design of a two-dimensional analogous Electrical Network is considered. Depending on the mechanical boundary conditions, a finite difference formulation of the Kirchhoff-Love equation of motion shows that we need to ensure specific Electrical connections along the edges of the analogous Network. A numerical model involving an assembly of element matrices validates the Electrical topology. Then, the passive Electrical circuit is implemented with capacitors, inductors and transformers, whose practical design is closely described. Focusing on the analogue of a clamped plate, experiments prove the ability of the proposed Electrical Network to approximate the behavior of the mechanical structure.
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Multimodal vibration damping of a plate by piezoelectric coupling to its analogous Electrical Network
Smart Materials and Structures, 2016Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Multimodal damping can be achieved by coupling a mechanical structure to an Electrical Network exhibiting similar modal properties. Focusing on a plate, a new topology for such an Electrical analogue is found from a finite difference approximation of the Kirchhoff-Love theory and the use of the direct electromechanical analogy. Discrete models based on element dynamic stiffness matrices are proposed to simulate square plate unit cells coupled to their Electrical analogues through two-dimensional piezoelectric transducers. A setup made of a clamped plate covered with an array of piezoelectric patches is built in order to validate the control strategy and the numerical models. The analogous Electrical Network is implemented with passive components as inductors, transformers and the inherent capacitance of the piezoelectric patches. The effect of the piezoelectric coupling on the dynamics of the clamped plate is significant as it creates the equivalent of a multimodal tuned mass damping. An adequate tuning of the Network then yields a broadband vibration reduction. In the end, the use of an analogous Electrical Network appears as an efficient solution for the multimodal control of a plate.
Boris Lossouarn - One of the best experts on this subject based on the ideXlab platform.
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Design of a passive Electrical analogue for piezoelectric damping of a plate
Journal of Intelligent Material Systems and Structures, 2017Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Vibrations of a mechanical structure can be reduced through a piezoelectric coupling to a passive Electrical Network exhibiting similar modal properties. For the control of a plate, the design of a two-dimensional analogous Electrical Network is considered. Depending on the mechanical boundary conditions, a finite difference formulation of the Kirchhoff-Love equation of motion shows that we need to ensure specific Electrical connections along the edges of the analogous Network. A numerical model involving an assembly of element matrices validates the Electrical topology. Then, the passive Electrical circuit is implemented with capacitors, inductors and transformers, whose practical design is closely described. Focusing on the analogue of a clamped plate, experiments prove the ability of the proposed Electrical Network to approximate the behavior of the mechanical structure.
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Multimodal vibration damping of a plate by piezoelectric coupling to its analogous Electrical Network
Smart Materials and Structures, 2016Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Multimodal damping can be achieved by coupling a mechanical structure to an Electrical Network exhibiting similar modal properties. Focusing on a plate, a new topology for such an Electrical analogue is found from a finite difference approximation of the Kirchhoff-Love theory and the use of the direct electromechanical analogy. Discrete models based on element dynamic stiffness matrices are proposed to simulate square plate unit cells coupled to their Electrical analogues through two-dimensional piezoelectric transducers. A setup made of a clamped plate covered with an array of piezoelectric patches is built in order to validate the control strategy and the numerical models. The analogous Electrical Network is implemented with passive components as inductors, transformers and the inherent capacitance of the piezoelectric patches. The effect of the piezoelectric coupling on the dynamics of the clamped plate is significant as it creates the equivalent of a multimodal tuned mass damping. An adequate tuning of the Network then yields a broadband vibration reduction. In the end, the use of an analogous Electrical Network appears as an efficient solution for the multimodal control of a plate.
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Multimodal vibration damping of a beam with a periodic array of piezoelectric patches connected to a passive Electrical Network
Smart Materials and Structures, 2015Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu AucejoAbstract:A multimodal damping strategy is implemented by coupling a beam to its analogue Electrical Network. This Network comes from the direct electromechanical analogy applied to a transverse lattice of point masses that represents the discrete model of a beam. The mechanical and Electrical structures are connected together through an array of piezoelectric patches. A discrete and a semi-continuous model are proposed to describe the piezoelectric coupling. Both are based on the transfer matrix formulation and consider a finite number of patches. It is shown that a simple coupling condition gives a Network that approximates the modal properties of the beam. A multimodal tuned mass effect is then obtained and a wide-band damping is introduced by choosing a suitable positioning for resistors in the Network. The strategy and the models are experimentally validated by coupling a free-free beam to a completely passive Network. A multimodal vibration reduction is observed, which proves the efficiency of the control solution and its potential in term of practical implementation.
Mathieu Aucejo - One of the best experts on this subject based on the ideXlab platform.
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Design of a passive Electrical analogue for piezoelectric damping of a plate
Journal of Intelligent Material Systems and Structures, 2017Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Vibrations of a mechanical structure can be reduced through a piezoelectric coupling to a passive Electrical Network exhibiting similar modal properties. For the control of a plate, the design of a two-dimensional analogous Electrical Network is considered. Depending on the mechanical boundary conditions, a finite difference formulation of the Kirchhoff-Love equation of motion shows that we need to ensure specific Electrical connections along the edges of the analogous Network. A numerical model involving an assembly of element matrices validates the Electrical topology. Then, the passive Electrical circuit is implemented with capacitors, inductors and transformers, whose practical design is closely described. Focusing on the analogue of a clamped plate, experiments prove the ability of the proposed Electrical Network to approximate the behavior of the mechanical structure.
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Multimodal vibration damping of a plate by piezoelectric coupling to its analogous Electrical Network
Smart Materials and Structures, 2016Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Multimodal damping can be achieved by coupling a mechanical structure to an Electrical Network exhibiting similar modal properties. Focusing on a plate, a new topology for such an Electrical analogue is found from a finite difference approximation of the Kirchhoff-Love theory and the use of the direct electromechanical analogy. Discrete models based on element dynamic stiffness matrices are proposed to simulate square plate unit cells coupled to their Electrical analogues through two-dimensional piezoelectric transducers. A setup made of a clamped plate covered with an array of piezoelectric patches is built in order to validate the control strategy and the numerical models. The analogous Electrical Network is implemented with passive components as inductors, transformers and the inherent capacitance of the piezoelectric patches. The effect of the piezoelectric coupling on the dynamics of the clamped plate is significant as it creates the equivalent of a multimodal tuned mass damping. An adequate tuning of the Network then yields a broadband vibration reduction. In the end, the use of an analogous Electrical Network appears as an efficient solution for the multimodal control of a plate.
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Multimodal vibration damping of a beam with a periodic array of piezoelectric patches connected to a passive Electrical Network
Smart Materials and Structures, 2015Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu AucejoAbstract:A multimodal damping strategy is implemented by coupling a beam to its analogue Electrical Network. This Network comes from the direct electromechanical analogy applied to a transverse lattice of point masses that represents the discrete model of a beam. The mechanical and Electrical structures are connected together through an array of piezoelectric patches. A discrete and a semi-continuous model are proposed to describe the piezoelectric coupling. Both are based on the transfer matrix formulation and consider a finite number of patches. It is shown that a simple coupling condition gives a Network that approximates the modal properties of the beam. A multimodal tuned mass effect is then obtained and a wide-band damping is introduced by choosing a suitable positioning for resistors in the Network. The strategy and the models are experimentally validated by coupling a free-free beam to a completely passive Network. A multimodal vibration reduction is observed, which proves the efficiency of the control solution and its potential in term of practical implementation.
Abderrahmane Beroual - One of the best experts on this subject based on the ideXlab platform.
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Modelling of the negative lightning discharge with an equivalent Electrical Network
2007Co-Authors: Abderrahmane Beroual, Jean Rakotonandrasana, Issouf FofanaAbstract:In the present work a simplified model of negative lightning discharge taking into account the different phases of the propagation (i.e., the initiation of the first corona, the negative and space leaders and the junction of leaders) is presented. This model uses LCR line Electrical Network parameters derived from electromagnetic field, physical laws and gas discharge theories. Assuming the discharge channel to a long conductor and taking into account criteria for instabilities and some atmospheric conditions, a mathematical model is derived that enables to determine the discharge main macroscopic parameters. The computed results are found to be in good agreement with data reported in the literature.
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Determination of the Streamers Characteristics Propagating in Liquids using the Electrical Network Computation
IEEE Transactions on Dielectrics and Electrical Insulation, 2006Co-Authors: Thomas Aka-ngnui, Abderrahmane BeroualAbstract:This work is devoted to the modeling of branching streamers propagating in transformer oil using an equivalent Electrical Network and the Electrical Network computation. The proposed model enables to determine the different characteristics of the streamer (i.e., the associated current and the Electrical charge, the power and the energy injected in the liquid, the local electric field at the streamer head, the streamer shape and its velocity, the mobility of the charge carriers within the streamer channels, the local viscosity and temperature). It's shown through the simulated values of the mobility of charge carriers, the local viscosity and temperature that both electronic and gaseous mechanisms are implicated in the streamer development. The gaseous nature of streamers and the role of the local electric field are evidenced. The influence of the conductivity and additives as well as the electrode gap on the propagation velocity of positive streamers is analyzed.
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Modelling of multi-channel streamers propagation in liquid dielectrics using the computation Electrical Network
Journal of Physics D: Applied Physics, 2001Co-Authors: Thomas Aka-ngnui, Abderrahmane BeroualAbstract:This work is devoted to the modelling of branching streamers, propagating in liquid dielectrics using an equivalent Electrical Network, physical laws and energetic considerations. This model enables the prediction of the characteristics of the streamer such as the current, the Electrical charge, the energy and the power injected in the liquid medium, the local electric field, the streamer pattern and its velocity. The shape and amplitude of the different characteristics so simulated are in quite good accordance with those reported in the literature. It appears from our modelling that the shape and the propagation mode of the streamer depend not only on the test conditions but also on the local electric field. The values of the mobility of charge carriers within the streamer channels, the local viscosity and temperature deduced from this model indicate that both electronic and gaseous mechanisms are implicated in the streamer development.
Jean-françois Deü - One of the best experts on this subject based on the ideXlab platform.
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Design of a passive Electrical analogue for piezoelectric damping of a plate
Journal of Intelligent Material Systems and Structures, 2017Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Vibrations of a mechanical structure can be reduced through a piezoelectric coupling to a passive Electrical Network exhibiting similar modal properties. For the control of a plate, the design of a two-dimensional analogous Electrical Network is considered. Depending on the mechanical boundary conditions, a finite difference formulation of the Kirchhoff-Love equation of motion shows that we need to ensure specific Electrical connections along the edges of the analogous Network. A numerical model involving an assembly of element matrices validates the Electrical topology. Then, the passive Electrical circuit is implemented with capacitors, inductors and transformers, whose practical design is closely described. Focusing on the analogue of a clamped plate, experiments prove the ability of the proposed Electrical Network to approximate the behavior of the mechanical structure.
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Multimodal vibration damping of a plate by piezoelectric coupling to its analogous Electrical Network
Smart Materials and Structures, 2016Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu Aucejo, Kenneth A. CunefareAbstract:Multimodal damping can be achieved by coupling a mechanical structure to an Electrical Network exhibiting similar modal properties. Focusing on a plate, a new topology for such an Electrical analogue is found from a finite difference approximation of the Kirchhoff-Love theory and the use of the direct electromechanical analogy. Discrete models based on element dynamic stiffness matrices are proposed to simulate square plate unit cells coupled to their Electrical analogues through two-dimensional piezoelectric transducers. A setup made of a clamped plate covered with an array of piezoelectric patches is built in order to validate the control strategy and the numerical models. The analogous Electrical Network is implemented with passive components as inductors, transformers and the inherent capacitance of the piezoelectric patches. The effect of the piezoelectric coupling on the dynamics of the clamped plate is significant as it creates the equivalent of a multimodal tuned mass damping. An adequate tuning of the Network then yields a broadband vibration reduction. In the end, the use of an analogous Electrical Network appears as an efficient solution for the multimodal control of a plate.
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Multimodal vibration damping of a beam with a periodic array of piezoelectric patches connected to a passive Electrical Network
Smart Materials and Structures, 2015Co-Authors: Boris Lossouarn, Jean-françois Deü, Mathieu AucejoAbstract:A multimodal damping strategy is implemented by coupling a beam to its analogue Electrical Network. This Network comes from the direct electromechanical analogy applied to a transverse lattice of point masses that represents the discrete model of a beam. The mechanical and Electrical structures are connected together through an array of piezoelectric patches. A discrete and a semi-continuous model are proposed to describe the piezoelectric coupling. Both are based on the transfer matrix formulation and consider a finite number of patches. It is shown that a simple coupling condition gives a Network that approximates the modal properties of the beam. A multimodal tuned mass effect is then obtained and a wide-band damping is introduced by choosing a suitable positioning for resistors in the Network. The strategy and the models are experimentally validated by coupling a free-free beam to a completely passive Network. A multimodal vibration reduction is observed, which proves the efficiency of the control solution and its potential in term of practical implementation.