Passive damping using a piezoelectric device is a well-known technique. Both resistor and inducto... more Passive damping using a piezoelectric device is a well-known technique. Both resistor and inductor loads connected to the piezoceramic are commonly used to attenuate a given resonance mode on a structure equipped with piezo dampers. The main drawback of this technique is its narrow band behavior and especially in the case of an inductor tuned passive piezo damper. The proposed
The SSD technique proposed here addresses the problem of resonance damping on a mechanical struct... more The SSD technique proposed here addresses the problem of resonance damping on a mechanical structure. SSD stands for Synchronized Switch Damping. Apart from active techniques, passive ones consist in connecting a piezoelectric insert attached to the structure to a passive electric network in which the energy generated by the piezoelectric inserts is degraded. In the semi passive approach, the piezoelectric
Ferroelectric single crystals Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT) are promising full material... more Ferroelectric single crystals Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT) are promising full materials for nonresonant or large bandwidth transducers due to the large values of their piezoelectric properties (d ij , k ij ) and their mechanical quality factor (Q ij ). However the properties of these materials depend greatly on the content of titanium which influences very significantly the symmetry of the crystal. In this paper we try to understand the influence of the percentage of Titanium in these crystals by studying the two compositions that are in very different phases at room temperature (rhombohedral and tetragonal symmetries). Crystals of pure PZN-4.5PT and PZN-12PT were grown by a Flux technique. The typical single crystals obtained are brown yellow. The room temperature dielectric permittivity along the <001> direction is about 900 for the PZN-12PT, which is smaller than that of the PZN-4.5PT (5840). The Curie point T c of the tetragonal crystal is about 220 • C (which is higher than that of the rhombohedral one (166 • C)), while the ferroelectric phase transition temperature is 130 • C for the PZN-4.5PT single crystal. The remnant polarization and coercive field of <001> oriented crystals measured at 1 kHz are around 40 µC/cm 2 and 3.30 kV/cm, respectively for the PZN-4.5PT, 27µC/cm 2 and 11.1 kV/cm for the PZN-12PT single crystal. The d 33 versus uniaxial stress shows that this coefficient is more stable for the single crystal with low Ti than for that with high rate of Ti. The study of temperature stability on these crystals shows a possible presence of an unidentified phase in the low and negative range temperature for the PZN-4.5PT.
This article reviews the developments in electrostrictive polymers for energy harvesting. Electro... more This article reviews the developments in electrostrictive polymers for energy harvesting. Electrostrictive polymers are a variety of electroactive polymers that deform due to the electrostatic and polarization interaction between two electrodes with opposite electric charge. Electrostrictive polymers have been the subject of much interest and research over the past decade. In earlier years, much of the focus was placed on actuator configurations, and in more recent years, the focus has turned to investigating material properties that may enhance electromechanical activities. Since the last 5 years and with the development of low-power electronics, the possibility of using these materials for energy harvesting has been investigated. This review outlines the operating principle in energy scavenging mode and conversion mechanisms behind this generator technology, highlights some of its advantages over existing actuator technologies, identifies some of the challenges associated with its development, and examines the main focus of research within this field, including some of the potential applications. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 523-535, 2012
Journal of Intelligent Material Systems and Structures, 2005
This article presents a nonlinear approach to optimize the power flow of vibration-based piezoele... more This article presents a nonlinear approach to optimize the power flow of vibration-based piezoelectric energy-harvesting devices. This self-adaptive principle is based on a particular synchronization between extraction of the electric charge produced by the piezoelectric element and the system vibrations, which maximizes the mechanical to electrical energy conversion. An analytical expression of the optimal power flow is derived from a
Journal of Intelligent Material Systems and Structures, 2005
This paper presents a new application of the ‘Synchronized Switch Harvesting on Inductor’ (SSHI).... more This paper presents a new application of the ‘Synchronized Switch Harvesting on Inductor’ (SSHI). This nonlinear technique results in a significant increase of the electromechanical conversion capability of piezoelectric materials. Previous studies have shown the interest of this technique on steady state excited structures equipped with piezoelectric elements where the harvested power may be increased nearly tenfold compared to the
Journal of Intelligent Material Systems and Structures, 2006
This article describes a new approach to harvest electrical energy from a mechanically excited st... more This article describes a new approach to harvest electrical energy from a mechanically excited structure equipped with piezoelectric elements. Standard harvesting circuits using piezoelectric elements as an electric generator consist of an AC-DC converter coupled to a load. The technique proposed herein is fully compatible with the standard approach. The difference consists in adding up an electrical switching device connected
This letter reports on the influence of piezomagnetic loss in magnetostrictive Terfenol-D (TeD)/p... more This letter reports on the influence of piezomagnetic loss in magnetostrictive Terfenol-D (TeD)/polyurethane composite layer/piezoelectric PZT ceramic layer laminates on the phase shift between magnetoelectric current and ac magnetic field versus bias dc field. For a given low measurement frequency (1kHz), piezomagnetic losses are predominant when the amount of TeD powder embedded in polyurethane is small (2vol.%), inducing an imaginary
Proceedings of SPIE - The International Society for Optical Engineering, 2004
The damping of vibration resonance is a crucial problem for light and elongated structures. Diffe... more The damping of vibration resonance is a crucial problem for light and elongated structures. Different kinds of solutions have been developed in order to address the problem of volume or mass, or temperature dependence which are common to the passive approach. In the semi-passive technique proposed here, damping is obtained through the use of piezoelectric patches bonded on the structure.
IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2005
This paper presents a new technique of electrical energy generation using mechanically excited pi... more This paper presents a new technique of electrical energy generation using mechanically excited piezoelectric materials and a nonlinear process. This technique, called synchronized switch harvesting (SSH), is derived from the synchronized switch damping (SSD), which is a nonlinear technique previously developed to address the problem of vibration damping on mechanical structures. This technique results in a significant increase of the electromechanical conversion capability of piezoelectric materials. Comparatively with standard technique, the electrical harvested power may be increased above 900%. The performance of the nonlinear processing is demonstrated on structures excited at their resonance frequency as well as out of resonance.
Passive damping using a piezoelectric device is a well-known technique. Both resistor and inducto... more Passive damping using a piezoelectric device is a well-known technique. Both resistor and inductor loads connected to the piezoceramic are commonly used to attenuate a given resonance mode on a structure equipped with piezo dampers. The main drawback of this technique is its narrow band behavior and especially in the case of an inductor tuned passive piezo damper. The proposed
The SSD technique proposed here addresses the problem of resonance damping on a mechanical struct... more The SSD technique proposed here addresses the problem of resonance damping on a mechanical structure. SSD stands for Synchronized Switch Damping. Apart from active techniques, passive ones consist in connecting a piezoelectric insert attached to the structure to a passive electric network in which the energy generated by the piezoelectric inserts is degraded. In the semi passive approach, the piezoelectric
Ferroelectric single crystals Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT) are promising full material... more Ferroelectric single crystals Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT) are promising full materials for nonresonant or large bandwidth transducers due to the large values of their piezoelectric properties (d ij , k ij ) and their mechanical quality factor (Q ij ). However the properties of these materials depend greatly on the content of titanium which influences very significantly the symmetry of the crystal. In this paper we try to understand the influence of the percentage of Titanium in these crystals by studying the two compositions that are in very different phases at room temperature (rhombohedral and tetragonal symmetries). Crystals of pure PZN-4.5PT and PZN-12PT were grown by a Flux technique. The typical single crystals obtained are brown yellow. The room temperature dielectric permittivity along the <001> direction is about 900 for the PZN-12PT, which is smaller than that of the PZN-4.5PT (5840). The Curie point T c of the tetragonal crystal is about 220 • C (which is higher than that of the rhombohedral one (166 • C)), while the ferroelectric phase transition temperature is 130 • C for the PZN-4.5PT single crystal. The remnant polarization and coercive field of <001> oriented crystals measured at 1 kHz are around 40 µC/cm 2 and 3.30 kV/cm, respectively for the PZN-4.5PT, 27µC/cm 2 and 11.1 kV/cm for the PZN-12PT single crystal. The d 33 versus uniaxial stress shows that this coefficient is more stable for the single crystal with low Ti than for that with high rate of Ti. The study of temperature stability on these crystals shows a possible presence of an unidentified phase in the low and negative range temperature for the PZN-4.5PT.
This article reviews the developments in electrostrictive polymers for energy harvesting. Electro... more This article reviews the developments in electrostrictive polymers for energy harvesting. Electrostrictive polymers are a variety of electroactive polymers that deform due to the electrostatic and polarization interaction between two electrodes with opposite electric charge. Electrostrictive polymers have been the subject of much interest and research over the past decade. In earlier years, much of the focus was placed on actuator configurations, and in more recent years, the focus has turned to investigating material properties that may enhance electromechanical activities. Since the last 5 years and with the development of low-power electronics, the possibility of using these materials for energy harvesting has been investigated. This review outlines the operating principle in energy scavenging mode and conversion mechanisms behind this generator technology, highlights some of its advantages over existing actuator technologies, identifies some of the challenges associated with its development, and examines the main focus of research within this field, including some of the potential applications. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 523-535, 2012
Journal of Intelligent Material Systems and Structures, 2005
This article presents a nonlinear approach to optimize the power flow of vibration-based piezoele... more This article presents a nonlinear approach to optimize the power flow of vibration-based piezoelectric energy-harvesting devices. This self-adaptive principle is based on a particular synchronization between extraction of the electric charge produced by the piezoelectric element and the system vibrations, which maximizes the mechanical to electrical energy conversion. An analytical expression of the optimal power flow is derived from a
Journal of Intelligent Material Systems and Structures, 2005
This paper presents a new application of the ‘Synchronized Switch Harvesting on Inductor’ (SSHI).... more This paper presents a new application of the ‘Synchronized Switch Harvesting on Inductor’ (SSHI). This nonlinear technique results in a significant increase of the electromechanical conversion capability of piezoelectric materials. Previous studies have shown the interest of this technique on steady state excited structures equipped with piezoelectric elements where the harvested power may be increased nearly tenfold compared to the
Journal of Intelligent Material Systems and Structures, 2006
This article describes a new approach to harvest electrical energy from a mechanically excited st... more This article describes a new approach to harvest electrical energy from a mechanically excited structure equipped with piezoelectric elements. Standard harvesting circuits using piezoelectric elements as an electric generator consist of an AC-DC converter coupled to a load. The technique proposed herein is fully compatible with the standard approach. The difference consists in adding up an electrical switching device connected
This letter reports on the influence of piezomagnetic loss in magnetostrictive Terfenol-D (TeD)/p... more This letter reports on the influence of piezomagnetic loss in magnetostrictive Terfenol-D (TeD)/polyurethane composite layer/piezoelectric PZT ceramic layer laminates on the phase shift between magnetoelectric current and ac magnetic field versus bias dc field. For a given low measurement frequency (1kHz), piezomagnetic losses are predominant when the amount of TeD powder embedded in polyurethane is small (2vol.%), inducing an imaginary
Proceedings of SPIE - The International Society for Optical Engineering, 2004
The damping of vibration resonance is a crucial problem for light and elongated structures. Diffe... more The damping of vibration resonance is a crucial problem for light and elongated structures. Different kinds of solutions have been developed in order to address the problem of volume or mass, or temperature dependence which are common to the passive approach. In the semi-passive technique proposed here, damping is obtained through the use of piezoelectric patches bonded on the structure.
IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2005
This paper presents a new technique of electrical energy generation using mechanically excited pi... more This paper presents a new technique of electrical energy generation using mechanically excited piezoelectric materials and a nonlinear process. This technique, called synchronized switch harvesting (SSH), is derived from the synchronized switch damping (SSD), which is a nonlinear technique previously developed to address the problem of vibration damping on mechanical structures. This technique results in a significant increase of the electromechanical conversion capability of piezoelectric materials. Comparatively with standard technique, the electrical harvested power may be increased above 900%. The performance of the nonlinear processing is demonstrated on structures excited at their resonance frequency as well as out of resonance.
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Papers by Daniel Guyomar