https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Wed, 15 Apr 2026 23:12:46 GMT 2026-04-15T23:12:46Z http://hdl.handle.net/10985/10141 Modelling, identification and control of a Langevin transducer GHENNA, Sofiane; GIRAUD, Frédéric; AMBERG, Michel; LEMAIRE-SEMAIL, Betty; GIRAUD-AUDINE, Christophe The control of the vibration amplitude, and the resonance frequency tracking for ultrasonic transducer have been established. However, some applications require to control the vibration amplitude and its relative phase at a fixed frequency as the generation of travelling wave. In this paper, the transducer is modelled in rotating frame, and the decoupling according to two-axis allows to obtain a double independent closed loop control to address this issue. It is possible to control the transducer vibration amplitude and its relative phase, in steady state even in transient by acting on the amplitude of the supply voltage. Thanks to vector control method. This approach will be confirmed with experimental and simulation results. Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/10985/10141 2015-01-01T00:00:00Z GHENNA, Sofiane GIRAUD, Frédéric AMBERG, Michel LEMAIRE-SEMAIL, Betty GIRAUD-AUDINE, Christophe The control of the vibration amplitude, and the resonance frequency tracking for ultrasonic transducer have been established. However, some applications require to control the vibration amplitude and its relative phase at a fixed frequency as the generation of travelling wave. In this paper, the transducer is modelled in rotating frame, and the decoupling according to two-axis allows to obtain a double independent closed loop control to address this issue. It is possible to control the transducer vibration amplitude and its relative phase, in steady state even in transient by acting on the amplitude of the supply voltage. Thanks to vector control method. This approach will be confirmed with experimental and simulation results. http://hdl.handle.net/10985/9275 Control of a multi-degree of freedom worktool for vibrations assisted forging NGUYEN, Thanh Hung; AMBERG, Michel; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; GIRAUD-AUDINE, Christophe This paper addresses the control of a tool developed to superimpose vibrations along several directions on a piece during forging. Piezoelectric actuators are used to provide the required forces and speeds. Due to the minute displacements of the actuators, flexible hinges are used in a special arrangement in order realize the specified movements and to ensure controllability. The experimental results confirm the approach. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/9275 2014-01-01T00:00:00Z NGUYEN, Thanh Hung AMBERG, Michel LEMAIRE-SEMAIL, Betty ABBA, Gabriel GIRAUD-AUDINE, Christophe This paper addresses the control of a tool developed to superimpose vibrations along several directions on a piece during forging. Piezoelectric actuators are used to provide the required forces and speeds. Due to the minute displacements of the actuators, flexible hinges are used in a special arrangement in order realize the specified movements and to ensure controllability. The experimental results confirm the approach. http://hdl.handle.net/10985/9276 Inversion-based control of electromechanical systems using causal graphical descriptions BARRE, Pierre-Jean; BOUSCAYROL, Alain; DELARUE, Philippe; DUMETZ, Eric; GIRAUD, Frédéric; HAUTIER, Jean-Paul; LEMAIRE-SEMAIL, Betty; SEMAIL, Eric; KESTELYN, Xavier Causal Ordering Graph and Energetic Macroscopic Representation are graphical descriptions to model electromechanical systems using integral causality. Inversion rules have been defined in order to deduce control structure step-bystep from these graphical descriptions. These two modeling tools can be used together to develop a two-layer control of system with complex parts. A double-drive paper system is taken as an example. The deduced control yields good performances of tension regulation and velocity tracking. Sun, 01 Jan 2006 00:00:00 GMT http://hdl.handle.net/10985/9276 2006-01-01T00:00:00Z BARRE, Pierre-Jean BOUSCAYROL, Alain DELARUE, Philippe DUMETZ, Eric GIRAUD, Frédéric HAUTIER, Jean-Paul LEMAIRE-SEMAIL, Betty SEMAIL, Eric KESTELYN, Xavier Causal Ordering Graph and Energetic Macroscopic Representation are graphical descriptions to model electromechanical systems using integral causality. Inversion rules have been defined in order to deduce control structure step-bystep from these graphical descriptions. These two modeling tools can be used together to develop a two-layer control of system with complex parts. A double-drive paper system is taken as an example. The deduced control yields good performances of tension regulation and velocity tracking. http://hdl.handle.net/10985/8547 Modelling of forging processes assisted by piezoelectric actuators : principles and experimental validation NGUYEN, Thanh Hung; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; GIRAUD-AUDINE, Christophe This paper presents the modelling of a forging processes assisted by a piezoelectric actuator (PA), which is used to generate specific low frequency vibration waveforms. Experimental results show that such waveforms reduce the necessary forging force during upsetting tests. The main problems which remain are defining the appropriate waveforms, predicting their influence on the process and the actuator and designing the control. Due to the complexity of the interactions between the different components of the system, a complete model of the process is needed. Such a model is developed here using an energetic macroscopic representation to preserve causality throughout the modelling. Simulation results are then compared to representative experimental results. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/8547 2014-01-01T00:00:00Z NGUYEN, Thanh Hung LEMAIRE-SEMAIL, Betty ABBA, Gabriel GIRAUD-AUDINE, Christophe This paper presents the modelling of a forging processes assisted by a piezoelectric actuator (PA), which is used to generate specific low frequency vibration waveforms. Experimental results show that such waveforms reduce the necessary forging force during upsetting tests. The main problems which remain are defining the appropriate waveforms, predicting their influence on the process and the actuator and designing the control. Due to the complexity of the interactions between the different components of the system, a complete model of the process is needed. Such a model is developed here using an energetic macroscopic representation to preserve causality throughout the modelling. Simulation results are then compared to representative experimental results. http://hdl.handle.net/10985/7356 Progressive wave: a new multisource vibration technique to assist forming processes - kinematic study, simulation results and design proposition KHAN, Armaghan; NGUYEN, Thanh Hung; ABBA, Gabriel; LEMAIRE-SEMAIL, Betty; GIRAUD-AUDINE, Christophe Use of vibration in the forming process has already shown numerous advantages in the improvement of mechanical and surface properties of workpiece such as good surface or less friction between die and workpiece. The aim of this work is to develop a mathematical model of a progressive wave in the lower die due to the vibration given by multi piezoelectric actuators to assist the forging process. Based on the mathematical model, simulations using nite element software Forge2011® have been performed to observe the presence of progressive wave in the workpiece due to the movement of the lower die. The simulations' results con rm the existence of progressive wave in the workpiece and demonstrate the e ect of progressive wave to reduce the forging load and improve the forging process. Tue, 01 Jan 2013 00:00:00 GMT http://hdl.handle.net/10985/7356 2013-01-01T00:00:00Z KHAN, Armaghan NGUYEN, Thanh Hung ABBA, Gabriel LEMAIRE-SEMAIL, Betty GIRAUD-AUDINE, Christophe Use of vibration in the forming process has already shown numerous advantages in the improvement of mechanical and surface properties of workpiece such as good surface or less friction between die and workpiece. The aim of this work is to develop a mathematical model of a progressive wave in the lower die due to the vibration given by multi piezoelectric actuators to assist the forging process. Based on the mathematical model, simulations using nite element software Forge2011® have been performed to observe the presence of progressive wave in the workpiece due to the movement of the lower die. The simulations' results con rm the existence of progressive wave in the workpiece and demonstrate the e ect of progressive wave to reduce the forging load and improve the forging process. http://hdl.handle.net/10985/8546 Analysis of the energy harvesting performance of a piezoelectric bender outside its resonance AMANCI, Adrien; GIRAUD, Frédéric; AMBERG, Michel; DAWSON, Francis; LEMAIRE-SEMAIL, Betty; GIRAUD-AUDINE, Christophe When the frequency of the source of vibration of a piezolectric generator is significantly different from its eigenfrequency, the dielectric power losses become prominent and decrease the amount of power which is practically harvested. For off-resonance vibrating frequencies, the optimal operating conditions can be obtained with a Maximum Power Point Tracking method. This paper introduces complex phasors in the study of power conversion for piezoelectric generators. These complex phasors are used to describe three strategies which help simplify the tracking of the optimal generator output power for vibration frequencies which are away from resonance. Experimental results obtained on a prototype illustrate and confirm the approach with the phasor approaches illustrate and confirm the success of the proposed optimal power tracking strategies. Finally, we show that the efficiency results of each strategy depend on whether they are used inside or outside a frequency bandwidth around the eigenfrequency, and that the length of this bandwidth depends on the excitation amplitude. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/8546 2014-01-01T00:00:00Z AMANCI, Adrien GIRAUD, Frédéric AMBERG, Michel DAWSON, Francis LEMAIRE-SEMAIL, Betty GIRAUD-AUDINE, Christophe When the frequency of the source of vibration of a piezolectric generator is significantly different from its eigenfrequency, the dielectric power losses become prominent and decrease the amount of power which is practically harvested. For off-resonance vibrating frequencies, the optimal operating conditions can be obtained with a Maximum Power Point Tracking method. This paper introduces complex phasors in the study of power conversion for piezoelectric generators. These complex phasors are used to describe three strategies which help simplify the tracking of the optimal generator output power for vibration frequencies which are away from resonance. Experimental results obtained on a prototype illustrate and confirm the approach with the phasor approaches illustrate and confirm the success of the proposed optimal power tracking strategies. Finally, we show that the efficiency results of each strategy depend on whether they are used inside or outside a frequency bandwidth around the eigenfrequency, and that the length of this bandwidth depends on the excitation amplitude. http://hdl.handle.net/10985/10143 Design and causal modelling of a piezoelectric multi-actuator system used in forging processes NGUYEN, Thanh Hung; AMBERG, Michel; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; GIRAUD-AUDINE, Christophe This paper presents the design of a mechatronic system integrating iezoelectric multi-actuators, which is used to generate low-frequency vibrations to assist the forging process. With the aim of controlling the complete system, modelling using Energetic Macroscopic Representation is performed. A prototype with an electrical system is developed in a short term to validate the design. Finally, the preliminary experiments are presented with the corresponding simulation’s results. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/10143 2014-01-01T00:00:00Z NGUYEN, Thanh Hung AMBERG, Michel LEMAIRE-SEMAIL, Betty ABBA, Gabriel GIRAUD-AUDINE, Christophe This paper presents the design of a mechatronic system integrating iezoelectric multi-actuators, which is used to generate low-frequency vibrations to assist the forging process. With the aim of controlling the complete system, modelling using Energetic Macroscopic Representation is performed. A prototype with an electrical system is developed in a short term to validate the design. Finally, the preliminary experiments are presented with the corresponding simulation’s results. http://hdl.handle.net/10985/8549 Modelling of piezoelectric actuators used in forging processes: principles and experimental validation NGUYEN, Thanh Hung; LEMAIRE-SEMAIL, Betty; ABBA, Gabriel; GIRAUD-AUDINE, Christophe This paper deals with the modelling of a piezo- electric stack actuator used to generate specific low frequency vibration waveforms to assist forging processes. Experimental results show that such waveforms reduce the necessary forging force during upsetting tests. The main problems which remain are defining the appropriate waveforms, predicting their in- fluence on the process and the actuator and designing the control. Due to the complexity of the interactions between the different components of the system, a complete model of the process is needed. Such a model is developed here using an energetic macroscopic representation to preserve causality throughout the modelling. Simulation results are then compared to representative experimental results. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/8549 2012-01-01T00:00:00Z NGUYEN, Thanh Hung LEMAIRE-SEMAIL, Betty ABBA, Gabriel GIRAUD-AUDINE, Christophe This paper deals with the modelling of a piezo- electric stack actuator used to generate specific low frequency vibration waveforms to assist forging processes. Experimental results show that such waveforms reduce the necessary forging force during upsetting tests. The main problems which remain are defining the appropriate waveforms, predicting their in- fluence on the process and the actuator and designing the control. Due to the complexity of the interactions between the different components of the system, a complete model of the process is needed. Such a model is developed here using an energetic macroscopic representation to preserve causality throughout the modelling. Simulation results are then compared to representative experimental results. http://hdl.handle.net/10985/14357 Improving the PAD actuator performances by vector control GIRAUD, Frédéric; AMBERG, Michel; MANGEOT, Charles; LEMAIRE-SEMAIL, Betty In this work, we address the problem of pull-out and stalling of the vector control of the piezo-actuator drive (PAD). The model presented reveals the similarities with synchronous machine and therefore we propose the vector control to solve the problem and to enhance its performances. The implementation using a position sensor is tested. Experimental results show that the vector control avoids pull-out and reduces dramatically the voltage applied to achieve the same performances. Speed up to 2.5 times the maximum rated speed at full load could be achieved without loss of synchronization. Mon, 01 Jan 2018 00:00:00 GMT http://hdl.handle.net/10985/14357 2018-01-01T00:00:00Z GIRAUD, Frédéric AMBERG, Michel MANGEOT, Charles LEMAIRE-SEMAIL, Betty In this work, we address the problem of pull-out and stalling of the vector control of the piezo-actuator drive (PAD). The model presented reveals the similarities with synchronous machine and therefore we propose the vector control to solve the problem and to enhance its performances. The implementation using a position sensor is tested. Experimental results show that the vector control avoids pull-out and reduces dramatically the voltage applied to achieve the same performances. Speed up to 2.5 times the maximum rated speed at full load could be achieved without loss of synchronization. http://hdl.handle.net/10985/17247 Use of progressive wave: a new multisource vibration technique to assist metal forming process KHAN, Armaghan; NGUYEN, Thanh Hung; ABBA, Gabriel; LEMAIRE-SEMAIL, Betty; GIRAUD-AUDINE, Christophe Application of vibration in metal forming process has already shown numerous advantages in the past. It improves not only mechanical and surface properties of workpiece but the integration of vibration in metal forming process has also been helpful in the reduction of forming force required for the process. Majority of the work done before in this field is related to single vibration source vibration and its application in metal forming process. The aim of this work is to develop a mathematical model for multivibration assisted forging process. The combination of multi mechanical vibrations generates a complicated movement of lower die without deforming it. This developed mathematical model proves that movement is basically in the form of progressive wave in the lower die thus resulting local surface movement. In reality this movement can be generated by the vibration given by multi piezoelectric actuators. Based on this mathematical model, simulations using finite element software Forge2011 r have been performed to observe the presence of progressive wave in the workpiece. The simulations’ kinematics confirms the existence of progressive wave in the workpiece. Simulation results demonstrate the effect of progressive wave to reduce the forging force, reduction of friction on the lower surface of die and hence improvement the forging process. Based on the developed mathematical model and simulation results, design proposition for multi vibration assisted forging process has been presented in this work. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/17247 2014-01-01T00:00:00Z KHAN, Armaghan NGUYEN, Thanh Hung ABBA, Gabriel LEMAIRE-SEMAIL, Betty GIRAUD-AUDINE, Christophe Application of vibration in metal forming process has already shown numerous advantages in the past. It improves not only mechanical and surface properties of workpiece but the integration of vibration in metal forming process has also been helpful in the reduction of forming force required for the process. Majority of the work done before in this field is related to single vibration source vibration and its application in metal forming process. The aim of this work is to develop a mathematical model for multivibration assisted forging process. The combination of multi mechanical vibrations generates a complicated movement of lower die without deforming it. This developed mathematical model proves that movement is basically in the form of progressive wave in the lower die thus resulting local surface movement. In reality this movement can be generated by the vibration given by multi piezoelectric actuators. Based on this mathematical model, simulations using finite element software Forge2011 r have been performed to observe the presence of progressive wave in the workpiece. The simulations’ kinematics confirms the existence of progressive wave in the workpiece. Simulation results demonstrate the effect of progressive wave to reduce the forging force, reduction of friction on the lower surface of die and hence improvement the forging process. Based on the developed mathematical model and simulation results, design proposition for multi vibration assisted forging process has been presented in this work.