WO2011069838A1 - Élément passif de production d'un écoulement dans des environnements déformables mécaniquement - Google Patents

Élément passif de production d'un écoulement dans des environnements déformables mécaniquement Download PDF

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Publication number
WO2011069838A1
WO2011069838A1 PCT/EP2010/068240 EP2010068240W WO2011069838A1 WO 2011069838 A1 WO2011069838 A1 WO 2011069838A1 EP 2010068240 W EP2010068240 W EP 2010068240W WO 2011069838 A1 WO2011069838 A1 WO 2011069838A1
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WO
WIPO (PCT)
Prior art keywords
passive element
energy
pae
mechanical
piezoelectric
Prior art date
Application number
PCT/EP2010/068240
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German (de)
English (en)
Inventor
Alexander Frey
Ingo KÜHNE
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2011069838A1 publication Critical patent/WO2011069838A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • H10N30/304—Beam type
    • H10N30/306—Cantilevers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings

Definitions

  • Passive element for generating flow in mechanically deformable environments
  • the invention relates to an arrangement for converting mechanical energy into electrical energy. Furthermore, the invention relates to a method for converting mechanical energy into electrical energy using a piezoelectric element.
  • the object of the present invention is to provide an arrangement and a method for a self-sufficient energy supply for decentralized systems, in particular in the industrial environment, be ⁇ .
  • the object is achieved by an arrangement for converting mechanical energy into electrical energy, the Anord ⁇ voltage comprising:
  • a passive element for generating a fluid stream, wherein the passive element that mechanical energy is generated in case of mechanical deformation of the environment acting on passive element and thereby a flow of fluid at an opening of the passive is such mounted on a mechanically warp ⁇ cash environment, Generated elements;
  • the type of order ⁇ conversion of mechanical energy into electrical energy described can be used anywhere where a fluid stream on ⁇ occurs or can be produced, for example, in a tire of a motor vehicle.
  • the fluid stream is at a suitably configured art DER piezoelectric element bypasses that this is excited to mechanical Schwingun ⁇ gen. These mechanical vibrations are used to generate electrical energy.
  • the gewonne ⁇ ne energy is a consumer (eg decentralized actuators or sensors) provided.
  • the arrangement according to the invention can be used in any dynamically deformable environments. For example, in conveyor belts, at the reversal points of the elastic conveyor belt is deformed or in industrial automation (eg robots), where there are many moving parts, eg
  • the piezoelectric element consists of at least one piezoelectric layer and electrode layers.
  • the Elect ⁇ clear layers can be made of various metals or metal alloys. Examples of the electrode material are platinum, titanium and a platinum / titanium alloy. Also conceivable are non-metallic, electrically conductive materials.
  • the piezoelectric layer can just ⁇ if consist of different materials. Examples include piezoelectric ceramic materials such as lead zirconate titanate (PZT), zinc oxide (ZnO) and aluminum nitride (A1N). Piezoelectric organic materials such as polyvinylidene difluoride (PVDF) or polytetrafluoroethylene (PTFE) are also conceivable.
  • PVDF polyvinylidene difluoride
  • PTFE polytetrafluoroethylene
  • Electrode layers can be applied to an optional carrier layer. This increases the stability of the piezoelekt ⁇ step element. Due to the fluid flow, the piezoelectric element is excited to mechanical vibrations. When flui ⁇ sized impact excitation, the piezoelectric element, such as a piezo flag, a decaying oscillation learns. About the pie ⁇ zoelektrischen effect, a periodic charge separation between the electrodes. The recoverable from laser-making flow is then externally as electrical energy for Ver ⁇ addition. An electrical connection to the electrodes and a corresponding wiring provide the electrical current for consumers.
  • the piezoelectric element is curved, for example, or suitable flow geometries are located on its surface, or the flow is as perpendicular as possible to the piezoelectric flag.
  • the fluid is preferably a gas or gas mixture.
  • a fluid in the form of a liquid is preferably electrically insulating.
  • a first advantageous embodiment of the invention is that the passive element is formed as a membrane of elastic material which is tightly connected in its entire edge region with the deformable environment.
  • rubber can be used as an elastic material.
  • the Memb can ⁇ ran for example, be sealed by gluing or vulcanizing to the environment. Such embodiments are easy to produce.
  • a further advantageous embodiment of the invention is that the membrane is substantially circular.
  • a further advantageous embodiment of the invention lies in the fact that the passive element has means for ensuring that the passive element forms a sufficient cavity. This ensures that sufficient fluid flow is generated.
  • a further advantageous embodiment of the invention is that as a means for securing the cavity of the passive element, a spring connection between the passive element and the mechanically deformable environment is attached, wherein the first end of the spring is mounted substantially centrally on the passive element and starting therefrom in lot ⁇ right direction, the second end of the spring is attached to the mechanically deformable environment.
  • This arrangement is easy to produce. Furthermore, it makes sense to design the arrangement so that the spring stiffness of the spring is minimized, followed by the spring stiffness of the membrane. Both spring stiffness should, however, significantly lower fail, as the spring stiffness of mechanically verformba ⁇ ren environment itself.
  • the piezoelectric element has a piezo-flag.
  • the piezoelectric element is designed as a bending ⁇ element, preferably as a piezo-flag.
  • the bending element is, for example, a piezoelectric bending ⁇ converter .
  • ceramic green sheets printed with a metallization for the electrode layers are stacked on top of one another and sintered. The result is a monolithic bending transducer.
  • the bending transducer can be configured as desired, example ⁇ as bimorph.
  • a further advantageous embodiment of the invention is that the piezo-flag has a substantially triangular base. This causes a high efficiency in energy conversion.
  • a further advantageous embodiment of the invention is that the piezoelectric element is formed as a membrane ⁇ forms and the fluid flow impinges substantially perpendicular to the membrane and wherein the membrane has at least two intersecting membrane slots.
  • a lateral Memb ⁇ ran tomesser (diameter of a diaphragm opening of the slit diaphragm) is, for example a few ym.
  • the diaphragm diameter is, for example, from the range of 100 ym to 10 mm ⁇ be selected.
  • the slots reduce the stiffness of the membrane.
  • the piezoelectric membrane is mounted in the energy wall ⁇ ler so that the fluid flow substantially perpendicular to them and makes them vibrate.
  • the membrane ⁇ slots intersect advantageously substantially at the center of the membrane and form triangles in the membrane structure.
  • the force of the fluid flow is used by the triangular arrangement in this way for efficient Ener ⁇ giewandlung.
  • the piezoelectric energy converter has piezoelectric elements with a substantially triangular base, which are arranged so that a substantially square overall area results, and wherein the
  • the piezoelectric elements are connected via their respective side edges with the inside of the energy ⁇ converter or with a fluid flow guide of the energy converter. The arrangement ensures efficient energy conversion.
  • a further advantageous embodiment of the invention is that a plurality of piezoelectric energy converters are connected behind ⁇ each other.
  • the energy produced ⁇ amount is increased. It is thus also supplied systems ⁇ to that require larger amounts of energy. Furthermore, this allows the power generation system to be scaled with respect to the required energy.
  • a further advantageous embodiment of the invention is that the passive element is designed as a deformable bag, in particular ⁇ special rubber bag, and the outer surface of the bag with inner surfaces of the mechanically deformable environment is substantially completely connected, wherein the bag within the mechanically deformable environment is attached and the fluid flow is generated by expansion or reduction of the bag volume.
  • the rubber bag is integrated or embedded in a substantially completely mechanically deformable environment. Mechanical changes in order ⁇ lim thereby act directly on the rubber bag and causing an expansion or reduction of the bag volume. Due to the resulting pressure or suction effect, the fluid flow is generated.
  • the object is further achieved by a method for converting mechanical energy into electrical energy by generating a fluid stream through mechanical Ener ⁇ gieein Koch on a passive element and by coupling a caused by the fluid flow force in a piezo-zoelektharis element such that the piezoelectric element is excited to mechanical vibrations.
  • This indirect nature of the energy input of the mechanical environment energy in the piezoelectric element has the advantage that the fluid flow can be produced in a very defined and a potential mechanical overload in the environment at geeigne ⁇ ter design of the passive element on not coupled directly to the piezoelectric element. Thus, a defect or destruction is avoided.
  • 3 shows a second example of a passive element for
  • 5 shows a piezoelectric diaphragm in plan view, to Ver ⁇ application in a piezoelectric energy converter
  • 6 shows an exemplary piezoelectric lobe (or egg NEN piezoelectric bending beam) having a substantially triangular base
  • 7 shows an exemplary arrangement of piezoelectric elements.
  • Figure 1 shows an example of the basic concept of the inventive arrangement A. The idea is based on converting the mechanical energy of a mechanically deformable environment U by a suitable technical arrangement in a fluidic flow FS. Under fluidic flow or fluid idstrom here are understood both gaseous and liquid Strö ⁇ ments. This fluid flow FS can then be used to drive an electromechanical energy converter EW.
  • the arrangement A for converting mechanical Energy in electrical energy comprises a passive element PAE for generating the fluid flow FS, wherein the passive ele ⁇ ment PAE the shape of a mechanically deformable environment U (eg tire lash, conveyor belt, or rubber sleeve for the protection of joints in industrial robots) is attached to that at mechanical deformation of the environment U a mechanical energy is generated, which acts on the passive element PAE and thereby generates a fluid flow FS at an opening 0 ( Figures 2 and 3) of the passive element PAE and a nen piezoelectric energy converter EW with at least one piezoelectric element PE ( Figure 4) into the one caused by the fluid stream FS mechanical force can be turned ⁇ coupled such that the piezoelectric element of the energy converter EW is excited to mechanical vibrations.
  • Electrodes of the piezoelectric element and a corresponding Verkabe ⁇ ment the generated electrical power for consumers is provided (eg for sensors or actuators). These sensors and actuators can thus be supplied with power autonomously.
  • This indirect type of energy coupling from the mechanical ambient energy in the energy converter EW has the advantage that a fluid flow FS can be generated very defined and a potential mechanical overload case in the environment U with a suitable design of the passive element PAE for flow generation not directly to the energy converter EW couples over. Thus, a defect or destruc ⁇ tion is (or at least a life impairment) of the energy converter EW avoided.
  • FIG. 2 shows a first example of a passive element PAE for flow generation FS.
  • the passive element PAE for flow generation FS can in the simplest case be a circular membrane of elastic material (eg rubber), which is tightly connected in the complete edge area with the deformable environment U (eg by means of adhesive bonding or by vulcanization).
  • An opening 0 (inlet or outlet) in the membrane provides pressure equalization when the trapped volume changes. This in turn leads to the formation of a fluidic flow FS.
  • the illustration of Figure 2 shows an undeformed disposition of the passive element PAE confining ⁇ Lich the mechanically deformable environment associated with the passive element PAE U.
  • the existing in Figure 2 spring F is optional and assists in addition, that the membrane ei ⁇ ne ordinary ie sufficient Spans cavity to generate a sufficient fluid flow FS.
  • the spring can be dispensed with if the stiffness of the rubber membrane is sufficient to clamp a sufficient cavity.
  • FIG. 3 shows a second example of a passive element PAE for flow generation FS, in which figure the passive element PAE is deformed.
  • the deformation of the passive element PAE in this example a membrane
  • the deformation of the passive element PAE is effected by the mechanical deformation of the environment U and leads to a reduction in volume (reduction) of the cavity formed by the passive element PAE and the mechanical deformable environment U.
  • This reduction in volume leads to a pressure increase in the cavity and causes an outward fluid flow FS at the opening 0 of the passive element, ie the membrane.
  • the spring stiffness of the spring F is as low as possible, followed by the spring stiffness of the membrane. Both spring stiffness should be significantly lower than the spring stiffness of the mechanical verformba ⁇ ren neighborhood U itself.
  • the passive element PAE is deformable. ren sack, in particular form as a rubber bag.
  • the outer surface of the bag is substantially completely connected to the inner surfaces of the mecha ⁇ cally deformable environment U, the bag within the mechanically deformable neighborhood U (eg integrated ortientbet ⁇ tet) is mounted, and the fluid stream FS by expansion or reduction the bag volume is generated.
  • the bag outer surface may be substantially positively connected to the inner surfaces of the mechanically deformable environment U.
  • the energy generated can also be increased by energy converters EW connected one behind the other. By consecutively ge ⁇ switched or cascaded power converter EW a Skal--regulation can take place with respect to the required electric power. In this way, the respectively required electrical energy for a corresponding application or application can be provided adequately and as needed.
  • the passive element PAE prevents a direct coupling of the mechanical ambient energy into the energy converter EW (overload protection).
  • FIG. 4 shows an example of a piezoelectric energy converter EW (in a lateral cross section) for use in the arrangement A according to the invention.
  • the piezoelectric energy converter EW is used for converting mechanical energy into electrical energy.
  • the energy converter EW has a piezoelectric element PE.
  • the piezo ⁇ electric element PE has a layer sequence of electric ⁇ den slaughter ES, piezoelectric layer and other Elekt- Roden slaughter ES auf.
  • the piezoelectric layer is a piezoceramic layer PKS with zinc oxide.
  • the piezoceramic layer comprises aluminum nitride.
  • Another alternative is lead zirconate titanate.
  • the electrode layers ES are made of platinum.
  • the conclusion forms a Trä ⁇ ger für TS made of silicon.
  • the support layer is silicon dioxide or silicon nitride.
  • the piezoelectric element PE is advantageously arranged in a housing chamber GK of a housing G of the energy converter EW. It is ensured that the fluid flow FS is passed to the piezoelectric element PE over. In this case, an induced by the fluid flow FS mecha ⁇ African force is coupled into the piezoelectric element PE. The result is the deflection AL of the piezoelectric element PE and, as a consequence thereof, the charge separation, on the basis of which electrical energy can be obtained via the electrodes, which can be provided to consumers (eg sensors, actuators) via suitable contacting and cabling.
  • consumers eg sensors, actuators
  • a fluid flow inlet FSE and a fluid stream outlet FSA are integrated and disposed opposite to each other in the housing wall of the energy G ⁇ coupler EW.
  • Fluidstrom- inlet FSE and fluid flow outlet FSA may also be disposed on the same side of the housing G.
  • a single (joint) opening of the housing G for fluid flow inlet FSE and fluid flow outlet FSA may also be disposed on the same side of the housing G.
  • the fluid stream generated by the passive element PAE FS is passed through suitable mechanisms of the opening 0 of the passive element PAE to the fluid flow inlet of the FSE ⁇ energy converter EW.
  • suitable mechanisms for fluid flow control for example, a pipe or a tunnel guide can be used.
  • the mechanisms used for fluid flow control ensure that in the fluid flow FS as little or no losses as possible occur. Losses would reduce the energy efficiency of the energy ⁇ transducer EW.
  • the piezoelectric element PE is a bent piezo-flag.
  • the piezo-flag is designed such that the piezo-flag is excited to vibrate by the passing of the fluid flow FS and thus by the coupling of the mechanical force.
  • a periodic ⁇ charge separation between the electrodes about the piezo-electric effect, a periodic ⁇ charge separation between the electrodes.
  • a further advantageous embodiment of the invention is that the piezoelectric element PE is formed as a membrane M and has a substantially circular base surface.
  • the piezoelectric diaphragm M is mounted in the energy converter ⁇ EW, that the fluid stream FS is true in Wesentli ⁇ surfaces perpendicular to them and bring to vibrate.
  • the circular shape allows generating maximum electrical energy and maximum electrical voltage with minimal mechanical stress on the membrane.
  • the piezoelectric membrane M can be connected by an adhesive bond at its edges with the frame of the energy converter EW.
  • the piezoelectric diaphragm M has a layer sequence of Elect ⁇ clear layer, a piezoelectric layer, and further on electrical den slaughter. Several such layer sequences can be stacked on top of each other, so that a multi-layer structure with stacked, alternately arranged
  • Electrode layers and piezoelectric layers results.
  • a deflection (deformation) of the piezoelectric layer which is caused by the action of the mechanical force of the fluid flow FS on the piezoelectric layer, leads to the charge transfer or charge separation in the piezoelectric layer (piezoelectric effect).
  • the two electrode layers and the piezoelectric layer are arranged to each other such that an induced on the La ⁇ dung charge flow separation for the production of electrical energy can be used. As a result, mechanical energy is converted into electrical energy.
  • the electrode material of the electrode layers can consist of a wide variety of metals or metal alloys. Examples of the electrode material are platinum, titanium and a platinum / titanium alloy. Also conceivable are non-metallic, electrically conductive materials.
  • the piezoelekt ⁇ generic layer may also consist of a wide variety Materi- alen. Examples include piezoelectric kera ⁇ mix materials such as lead zirconate titanate (PZT), zinc oxide (ZnO) and aluminum nitride (A1N). Piezoelectric organic materials such as polyvinylidene difluoride (PVDF) or polytetrafluoroethylene (PTFE) are also conceivable.
  • PVDF polyvinylidene difluoride
  • PTFE polytetrafluoroethylene
  • FIG. 5 shows a piezoelectric element PE formed as a piezoelectric membrane M in plan view, for use in a piezoelectric energy converter EW in the inventive arrangement A.
  • the circular shape of the membrane M allows generating maximum electrical energy and maximum electrical voltage with minimal mechanical stress on the membrane M.
  • Such counter bearings are, for example, a stop surface integrated in the housing lower part or a corresponding stop structure in the housing cover. This stop surface or stop structure ensure that the membrane M can not deflect further. They limit the degree of deflection and thus act as overload protection for the membrane M.
  • a lateral membrane diameter (diameter of a membrane opening of the membrane slit) is a few ym.
  • the membrane diameter is, for example ⁇ selected from the range of 0.5 ym to 50 ym.
  • the membrane M is easily elastically deformable.
  • the membrane slot extends partially or entirely along ei ⁇ ner thickness direction of the membrane M by the diaphragm reciprocated by M.
  • the membrane slot MS be designed in the form of a blind hole or as a through hole.
  • the membrane slots MS are advantageously oriented radially toward the center of the membrane and arranged around the center (star-shaped).
  • the piezoelectric membrane is mounted in the energy wall ⁇ ler so that the fluid flow FS is substantially perpendicular to them and makes them vibrate.
  • the Memb ⁇ ranschlitze MS intersect advantageously in Wesentli ⁇ chen in the center of the diaphragm M and form triangles in the membrane structure.
  • the force effect of the fluid flow FS is used by the triangular arrangement in this way for an efficient energy conversion.
  • the piezoelectric element PE can be based on MEMS technology (Micro Electro Mechanical Systems), designed both as a pebble or as a piezo membrane. With this technology, a piezoelectric energy converter EW and an arrangement A with very small lateral dimensions are accessible. In addition, very thin layers can be formed. For example, the layer thicknesses of the electrode layers are 0.1 .mu.m to 0.5 .mu.m.
  • the piezoelectric element PE is designed as a thin piezoelectric ⁇ cal flag or membrane.
  • the piezoelectric element PE has a very low mass.
  • a carrier layer TS may be provided at ⁇ play, a support layer made of silicon, polysilicon, Silicon dioxide (Si0 2 ) or silicon nitride (S13N 4 ).
  • Layer thickness of the carrier layer is selected from the range of 1 ym to 100 ym.
  • the carrier layer TS is optional.
  • FIG. 6 shows an exemplary piezoelectric lobe (or a piezoelectric bending beam) with a substantially triangular base area.
  • the fluid flow FS is substantially perpendicular to an end face of the piezo triangle PE and causes the piezo flag to vibrate.
  • Base surface causes a high efficiency in the energy conversion ⁇ ment.
  • the piezoelectric lobe according to FIG. 6 can be used, for example, in the energy converter according to FIG. 4 according to the invention.
  • FIG 7 shows an exemplary arrangement of piezoelectric elements PE, each having a substantially triangular Grundflä ⁇ che for use in a piezoelectric energy converter.
  • the piezoelectric elements (PE) are arranged so that a substantially square total surface area of the fluid stream impinges substantially resul ⁇ advantage and wherein perpendicular to the total base area.
  • the piezoelectric elements PE Ele ⁇ are connected via their respective side edges with the inner side of the power converter and with a Fluidstromrak- tion of the energy converter. The arrangement ensures efficient energy conversion.
  • Arrangement for converting mechanical energy into electrical energy comprising: a passive element for generating a fluid flow, wherein the passive element is attached to a mechanically deformable environment such that upon mechanical deformation of the environment a mechanical energy is generated acting on the mechanical element and thereby generates a fluid flow at an opening of the passive element; and a piezoelectric energy converter with at least one piezoelectric element ment, in the one caused by the fluid flow mecha ⁇ African force can be coupled such that the piezo ⁇ electric element is excited to mechanical vibrations and electricity is generated by the piezoelectric effect, the local for a self-sufficient power supply, in particular for de ⁇ central Systems (eg actuators or sensors) is used ⁇ bar.
  • de ⁇ central Systems eg actuators or sensors
  • This indirect way of coupling energy from the mechanical ambient energy into the piezoelectric element has the advantage that the fluid flow can be generated in a highly defined manner and does not directly couple a potential mechanical overload in the environment with a suitable design of the passive element to the piezoelectric element. Thus, a defect or destruction is avoided.

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un agencement de transformation d'énergie mécanique en énergie électrique, l'agencement comprenant : un élément passif destiné à produire un flux de fluide, cet élément passif étant implanté dans un environnement déformable mécaniquement de manière qu'en présence d'une déformation mécanique de l'environnement, une énergie mécanique est produite qui agit sur l'élément mécanique et produit alors un flux de fluide au niveau d'une ouverture de l'élément passif ; et un convertisseur d'énergie piézoélectrique avec au moins un élément piézoélectrique dans lequel peut être couplée une force mécanique transmise par le flux de fluide de manière à exciter des oscillations mécaniques dans l'élément piézoélectrique qui, en raison de l'effet piézoélectrique, produit du courant qui peut être utilisé pour une alimentation autonome, en particulier pour des systèmes locaux décentralisés (par exemple actionneurs ou détecteurs). Ce mode de couplage indirect de l'énergie entre l'énergie mécanique de l'environnement et l'élément piézoélectrique présente l'avantage que le flux de fluide peut être produit de manière bien définie et qu'une surcharge mécanique éventuelle dans l'environnement ne peut pas agir directement sur l'élément piézoélectrique si l'élément passif est soigneusement conçu. On évite ainsi une détérioration ou une destruction du composant.
PCT/EP2010/068240 2009-12-07 2010-11-25 Élément passif de production d'un écoulement dans des environnements déformables mécaniquement WO2011069838A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102009057281.3 2009-12-07
DE102009057281 2009-12-07
DE102010019738.6 2010-05-07
DE102010019738A DE102010019738A1 (de) 2009-12-07 2010-05-07 Passives Element zur Strömungserzeugung in mechanisch verformbaren Umgebungen

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WO2011069838A1 true WO2011069838A1 (fr) 2011-06-16

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CN104767266B (zh) * 2015-03-10 2017-04-26 西安交通大学 一种基于压电效应的发电背包

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822388A (en) * 1973-03-26 1974-07-02 Mc Donald Douglas Corp Stirling engine power system and coupler
US20020043895A1 (en) * 2000-10-25 2002-04-18 Richards Robert F. Piezoelectric micro-transducers, methods of use and manufacturing methods for the same
WO2005022606A2 (fr) * 2003-03-31 2005-03-10 The Penn State Research Foundation Generateur piezo-electrique thermoacoustique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822388A (en) * 1973-03-26 1974-07-02 Mc Donald Douglas Corp Stirling engine power system and coupler
US20020043895A1 (en) * 2000-10-25 2002-04-18 Richards Robert F. Piezoelectric micro-transducers, methods of use and manufacturing methods for the same
WO2005022606A2 (fr) * 2003-03-31 2005-03-10 The Penn State Research Foundation Generateur piezo-electrique thermoacoustique

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