35 results about "Piezoelectric coupling" patented technology

The present invention relates to an in-situ micro-nano impact indentation testing instrument, falling within the technical field of material micromechanical testing. The instrument comprises a nitrogen generation module, an environmental chamber, a high / low temperature loading module, an “optical-infrared” in-situ monitoring module, an “electromagnetic-piezoelectric” coupling impact module, etc. After the nitrogen is introduced into the environmental chamber and the test area is determined by microscopic imaging, the “electromagnetic-piezoelectric” coupling impact module can drive an indenter to indent a specimen. An acoustic emission sensor embedded in the high / low temperature loading module can monitor the surface crack propagation of the specimen. The “optical-infrared” in-situ monitoring module can perform real-time high-speed optical imaging and infrared imaging on the impact indentation process. The present invention can perform micro-nano impact indentation testing on the material at high or low temperatures.

The invention discloses a piezoelectric MEMS transducer and electronic equipment, and relates to the technical field of MEMS. The piezoelectric MEMS transducer comprises a substrate and a piezoelectric layer formed on the substrate, a cavity is further formed in the substrate, a bottom electrode is arranged on the first surface of the piezoelectric layer, and a first differential electrode and a second differential electrode are arranged on the second surface of the piezoelectric layer; the first differential electrodes and the second differential electrodes are alternately distributed on the second surface of the piezoelectric layer in the first direction, and the bottom electrodes are opposite to the first differential electrodes and the second differential electrodes; the piezoelectric layer is a single-crystal lithium niobate film or a single-crystal lithium tantalate film, the first direction serves as the x-axis positive direction of a right-handed coordinate system, the piezoelectric layer has crystal orientation of a target Euler angle, and the square value of the piezoelectric coupling coefficient of the piezoelectric layer in the first direction is larger than or equal to 1.52%. According to the piezoelectric MEMS transducer, the electromechanical coupling coefficient of the piezoelectric MEMS transducer can be improved.

The invention belongs to the field of functional material preparation, and particularly relates to a piezoelectric coupling photo-thermal enhanced flexible photocatalytic porous structure material preparation method and a product thereof. A photo-thermal material, catalyst powder and an organic piezoelectric material polyvinylidene fluoride (PVDF) are dispersed in a N, N-dimethylformamide (DMF) solution together, granulated sugar blocks are used as a pore forming agent to prepare the photocatalytic material with a flexible photocatalytic porous structure, the coupling effect of a piezoelectric electric field and the photo-thermal effect is achieved, and the photocatalytic performance is remarkably improved.

The embodiment of the invention provides an all-weather piezoelectric coupling photocatalyst as well as a preparation method and application thereof, the piezoelectric photocatalyst prepared by the embodiment of the invention can couple the characteristics of a piezoelectric material and a semiconductor, combines the principles of photocatalysis and piezoelectric catalysis, not only can realize all-weather algal inhibition with improved efficiency and speed, but also can realize all-weather algal inhibition with improved efficiency and speed. The wind energy, the water wave energy, the vibration and the solar energy in the nature can be coupled into a whole, a new principle and a new thought are provided for multi-path utilization, energy conservation and emission reduction of natural energy, and huge potential is achieved in future energy environment application.

The invention provides a piezoelectric MEMS transducer and an electrical product. The piezoelectric MEMS transducer comprises a first electrode layer, a second electrode layer and a single crystal piezoelectric film, the first electrode layer and the second electrode layer are correspondingly attached to the surfaces of the two sides of the single crystal piezoelectric film respectively. The single-crystal piezoelectric film is a single-crystal lithium niobate film or a single-crystal lithium tantalate film, and the single-crystal piezoelectric film has a determined cutting type of a target Euler angle, so that the piezoelectric coupling coefficient of the single-crystal piezoelectric film is not less than 6.4% or the absolute value of an e33 coefficient in a piezoelectric constant matrix is not less than 1.55; wherein the piezoelectric MEMS transducer works in a thickness expansion and contraction mode.

The invention relates to the technical field of bulk acoustic wave resonators, and particularly provides a bulk acoustic wave resonator and a design method thereof, and the method comprises the steps: determining the scandium doping concentration and thickness corresponding to a plurality of piezoelectric layers according to a target effective electromechanical coupling coefficient and a target resonator frequency, determining an electrode material and corresponding acoustic impedance according to the target loss performance; for each piezoelectric layer, acoustic parameters, piezoelectric coupling parameters and static capacitance parameters are calculated according to the corresponding scandium doping concentration and thickness, and the acoustic parameters comprise acoustic impedance; calculating the interface impedance of the adjacent layer structures according to the acoustic impedance of the adjacent layer structures; inputting all the acoustic parameters, all the static capacitance parameters, all the piezoelectric coupling parameters, the electrode material and all the interface impedance into a Mason model to complete the design of the bulk acoustic wave resonator; according to the method, the Mason model can comprehensively consider the influence of the physical parameter difference of a plurality of piezoelectric layers on the bulk acoustic wave resonator and the interfacial effect between the layer structures.

The utility model relates to the field of photocatalytic reaction technology, concretely relates to a kind of multi-channel photocatalysis-ultrasonic piezoelectric coupling reaction device, and the side end of reaction water tank is equipped with movable horizontal moving mechanism, and ultrasonic assembly is equipped on movable horizontal moving mechanism, movable horizontal moving mechanism drives ultrasonic assembly to move horizontally in the length direction of the side end of reaction water tank and different positions, for producing ultrasonic vibration in reaction water tank, to adjust the position of ultrasonic assembly for different number, position of photocatalytic reaction tube, flexible adaptability, introduce ultrasonic piezoelectric function, the dispersion uniformity of catalyst can be effectively enhanced using ultrasonic vibration, improve the contact probability of reactant and catalyst, accelerate reaction process. At the same time, the agglomeration phenomenon of catalyst is reduced, the service life of catalyst is prolonged, and the stability and repeatability of photocatalytic reaction are improved.

A quantum transducer includes a back gate having a doped semiconductor layer, a tunnel barrier located above the doped semiconductor layer, a quantum dot contacting a top surface of the tunnel barrier, a cap layer located above the tunnel barrier and covering the quantum dot, a surface acoustic wave (SAW) resonator located above the cap layer, a SAW transducer coupled to the SAW resonator, and a top gate located above the SAW resonator. The SAW resonator is mechanically coupled to the quantum dot. The depth and electrical conductivity of the doped semiconductor layer may be selected such that SAW attenuation is not the dominant contributor to the total phonon loss rate of the SAW resonator. The depth and electrical conductivity may also be selected such that the SAW transducer has a piezoelectric coupling constant of 0.055% or higher.

This invention provides an Ag-doped photocatalytic composite membrane, its preparation method, and its application, relating to the field of water treatment membrane technology. The Ag-doped photocatalytic composite membrane of this invention has a composite functional structure consisting of a polyester nonwoven fabric support layer, a PVDF base membrane core layer, an Ag-BaTiO3 / ZnIn2S4 piezoelectric-photocatalytic functional layer, and a polydopamine hydrophilic protective layer, arranged sequentially. By constructing an Ag-doped dual piezoelectric coupled heterojunction system, introducing the surface plasmon resonance effect of Ag ions, and combining plasma-assisted deposition technology with the composite functional structure, this invention achieves a wide spectral response (UV to near-infrared), highly efficient piezoelectric-photocatalytic synergistic degradation, robust catalyst adhesion to prevent detachment, and multiple effects of "separation-degradation-self-cleaning." This solves the problems of traditional piezoelectric-photocatalytic membranes in terms of catalytic efficiency, long-term stability, and industrial adaptability, and has good application prospects.

A photoelectric-thermoelectric-piezoelectric coupled hybrid energy harvesting apparatus includes a housing, a photoelectric-thermoelectric energy harvesting apparatus, and a piezoelectric energy harvesting apparatus. The housing is configured to support and accommodate the photoelectric-thermoelectric energy harvesting apparatus, the piezoelectric energy harvesting apparatus, and a heat dissipation plate. The photoelectric-thermoelectric energy harvesting apparatus is respectively arranged on five surfaces of the housing to implement reciprocally coupled harvesting of solar energy and thermal energy in a working environment. The piezoelectric energy harvesting apparatus is arranged on a right side surface of an interior of the housing to implement reciprocally coupled harvesting of thermal energy and mechanical energy in the working environment. With the use of the photoelectric-thermoelectric-piezoelectric coupled hybrid energy harvesting apparatus, reciprocal harvesting of solar energy, thermal energy, and mechanical energy that widely exist in nature can be realized, thereby breaking through the simple “1+1” implementation mode of multi-source energy harvesting.

The invention provides a surface acoustic wave filter self-adaptive frequency sweeping rapid simulation method, which comprises the following steps of performing three-dimensional modeling on a surface acoustic wave filter, setting parameter information of each solving region, and extracting a corresponding calculation model; performing discretization processing on the surface acoustic wave filter calculation model by using a hexahedral mesh; a piezoelectric coupling discrete process is deduced, a piezoelectric coupling spectrum element frequency domain solver is constructed, the discrete domain and solving parameters of the surface acoustic wave filter are imported into the solver, and the solver is initialized; and constructing a self-adaptive frequency sweeping algorithm, updating a frequency point needing to be calculated in a self-adaptive updating manner, calling a piezoelectric coupling frequency domain solver to calculate admittance of the frequency point, and finally obtaining a frequency-admittance characteristic curve of the surface acoustic wave filter model under the broadband. Based on the spectral element method and the self-adaptive frequency sweeping algorithm, the method has the advantages of small calculation memory and high solving efficiency under the condition that the solving precision is met.

The invention relates to a device for extracting and removing heavy metals and new pollutants in organic solid waste by cracking of a mortar disc and a preparation method and an application method, and belongs to the technical field of organic solid waste treatment. The device comprises a cracking and grinding pestle, a medicine seepage mortar disc, an upper millstone, a lower millstone and an ultrasonic filtration and adsorption piezoelectric coupling catalytic oxidizer, a pestle shaft is arranged on a middle shaft of the cracking and grinding pestle, and the lower end of the pestle shaft extends downwards and sequentially penetrates through the centers of an upper grinding disc and a lower grinding disc of the medicine seepage mortar disc to enter a cavity of the ultrasonic filtration and adsorption piezoelectric coupling catalytic oxidizer; a plurality of adsorption piezoelectric friction catalysis discs and friction catalysis driving discs which are arranged in a layered manner are arranged in a cavity of the ultrasonic filtration adsorption piezoelectric coupling catalytic oxidizer; the device is an organic solid waste treatment device integrating cracking extraction, filtering separation, adsorption, enrichment, and piezoelectric-advanced oxidation coupling purification of heavy metals and new pollutants. And online continuous treatment can be realized, and automatic control is easy.

The present invention supports the implementation of structures for bulk acoustic wave resonators that can increase piezoelectric coupling and suppress parasitic modes. The grooves between the electrodes of the disclosed digital to analog converter (IDT) reduce the generation of parasitic modes and prevent the propagation of the parasitic modes and the resonance accumulation of the amplitude of the parasitic modes. In addition, the grooves between the disclosed IDT electrodes suppress a high order mode in a horizontal direction and increase the resonant-anti-resonant frequency gap of the bulk acoustic wave resonator.

An acoustic resonator is provided, which ensures high piezoelectric coupling and exhibits reduced (e.g., compared to conventional XBARs) acoustic losses at (and around) a resonance frequency. The acoustic resonator comprises an interdigital transducer (IDT), the interleaved fingers of which are provided on or at least partly recessed into a piezoelectric layer. The IDT has a pitch of at least twice the total thickness of the piezoelectric layer. The piezoelectric layer is attached to a support structure and covers an open cavity formed in the latter such that the overlapping portions of the fingers are suspended over the cavity. The acoustic resonator is characterized in that the piezoelectric layer is made of a piezoelectric material having a crystallographic cut at which a lateral electric field produced between adjacent IDT fingers in response to applied RF potentials of periodically opposite polarity causes excitation of the SH1 mode in the piezoelectric layer.

The present disclosure relates generally to high voltage systems. In one embodiment, a balancing and measuring circuit is disclosed, comprising: a first capacitor electrically coupled between a first voltage and a chassis voltage, wherein the first voltage is greater than the chassis voltage; a second capacitor electrically coupled between a second voltage and the chassis voltage, wherein the second voltage is less than the chassis voltage; a first circuit associated with the first capacitor; and a second circuit associated with the second capacitor, wherein the first circuit and the second circuit each comprise: a resistive element; a switching element; a voltage circuit configured to generate a reference voltage; and a controller configured to monitor a voltage of a reference capacitor and to control the switching element based on the monitored voltage, wherein the resistive element and the switching element are connected in series.

The embodiment of the invention provides a nano confinement piezoelectric coupling photocatalyst and a preparation method and application thereof.The piezoelectric coupling photocatalyst provided by the embodiment of the invention comprises AgNbO3-Bi2Sn2O7, the particle size of AgNbO3 and the particle size of Bi2Sn2O7 are both nanoscale, the characteristics of a piezoelectric material and a semiconductor can be coupled, photocatalysis and piezoelectric catalysis principles are combined, the photocatalytic effect is good, and the photocatalytic effect is good. Not only can all-weather algal inhibition be realized, but also natural wind energy, water wave energy, vibration and solar energy can be coupled into a whole, and the effects of energy conservation and emission reduction are achieved.

The potassium sodium niobate-based piezoelectric ceramic provided in this application introduces a specific proportion of Fe 3+ , making Fe 3+ The potassium sodium niobate-based piezoelectric ceramics formed with defective dipoles in combination with oxygen vacancies can have a higher Curie temperature and good temperature stability; at the same time, the piezoelectric ceramics of the present application have a larger piezoelectric coupling constant kp and mechanical quality factor Q m , and it can be used as a sintering aid to reduce the temperature of ordinary sintering and improve the density of ceramics; the potassium sodium niobate-based piezoelectric ceramics of the present application can be prepared through industrial raw materials and are easy to achieve large-scale production.

The invention discloses an energy recovery and vibration reduction structure based on gyroscope-piezoelectric coupling. The structure comprises a frame, a piezoelectric coupling assembly and an energy recovery assembly, the stabilizing part comprises a rotating frame mounted on the frame and a gyroscope arranged on the rotating frame; the kinetic energy recovery part comprises an action body mounted on the frame and a piezoelectric plate mounted on the action body; a first adsorption piece is installed on the rotating frame, and a second adsorption piece is installed on the action body. When the vibration condition is serious, the first adsorption piece on the rotating frame can correspond to the second adsorption piece on the action piece in position, and at the moment, due to mutual influence of magnetic force between the first adsorption piece and the second adsorption piece and the influence of the magnetic force of the first adsorption piece, the further rotating resistance of the rotating frame can be increased; and the second adsorption piece enables the action body to act due to the magnetic force, so that the piezoelectric plate is stressed, mechanical energy is converted into electric energy, and the effect of energy recovery is achieved.

The present invention belongs to the intersection of vibration power generation and new energy. The purpose is to provide an origami variable stiffness magnetic suspension-piezoelectric coupling energy capture device to achieve the efficient energy capture function of mechanical power systems such as vehicle bodies operating in complex dynamic environments. The technical solution is: an origami variable stiffness magnetic suspension-piezoelectric coupling energy capture device, characterized in that: the device includes a mounting base that can be fixedly connected to an external power device, an electromagnetic induction coil located at the top or bottom of the mounting base, permanent magnets positioned at the top and bottom of the mounting base, respectively, and a magnetic suspension component that can slide linearly between the top and bottom of the mounting base.

The present invention discloses a photocatalytically coupled piezoelectric effect membrane fuel cell system, comprising a degradation chamber, a sample feed chamber provided on both sides of the degradation chamber, a photocatalytic membrane material provided at the connection between the degradation chamber and the sample feed chamber, a water outlet pipe connected to the upper portion of one end of the sample feed chamber, a water inlet pipe installed on both sides of the sample feed chamber, an aeration stone provided at one end of the water inlet pipe, and a sample outlet pipe installed on the top of the degradation chamber. The present invention uses a membrane material with piezoelectric and photocatalytic properties as the two poles of the fuel cell, converting chemical and mechanical energy into electrical energy under illumination and aeration, forming a piezoelectrically coupled photocatalytic membrane fuel cell system. Through aeration vibration, the piezoelectric and photocatalytic effects synergistically purify wastewater. The refraction of the prismatic polyhedron increases the utilization rate of visible light, accelerating the separation of photogenerated electrons and holes, and the vacuum pump pressure increases the contact area between the photocatalyst loaded in the membrane and the pollutants, improving the wastewater purification efficiency.

The present invention relates to an acoustic resonator, wherein each resonant element is at least partially coated with vertical electrodes on the sidewalls of its top piezoelectric portion and has its bottom portion firmly mounted on an underlying support substrate. The bottom portion of each resonant element has a width less than λ / 2, where λ is the wavelength of the shear acoustic wave in the bottom portion at the resonant frequency determined by the top portion. In this case, the total width of the top portion and the electrodes is greater than the width of the bottom portion, and vibrations from the top portion cannot propagate through the bottom portion, thereby enhancing piezoelectric coupling and providing structural robustness. In addition, a heat removal path can be provided in each resonant element from its top portion through its bottom portion to the substrate, which can improve the power handling characteristics of the resonator.

The invention provides a piezoelectric array adaptive oscillation acceleration off-location edge ablation suppression method and device, and relates to the field of oscillation acceleration off-location edge ablation suppression methods. The self-adaptive oscillation accelerated dislocation edge ablation suppression method based on the piezoelectric array comprises the following steps: S1, constructing a three-dimensional model of a piezoelectric element: constructing a three-dimensional geometric model of the piezoelectric element through computer-aided design software, and simulating a real geometric shape and material characteristics of the piezoelectric element so as to carry out detailed mechanical analysis; the method comprises the following steps: defining mechanical and electrical parameters of a piezoelectric material, inputting basic parameters such as a Young modulus, a Poisson's ratio, a piezoelectric constant and a dielectric constant, ensuring that simulated basic data is complete and reliable, and establishing a dynamic response equation of a piezoelectric element: accurately describing the dynamic response of the piezoelectric element under a high-frequency oscillation condition by adopting a piezoelectric coupling equation; and the simulation accuracy and precision are ensured.

The invention relates to a high-power-density broadband vibration energy taking method, which belongs to the technical field of vibration energy taking, and comprises the following steps: S1, building an electret-piezoelectric coupling low-frequency vibration energy taking array; s2, modulating a coupling beam which vibrates cooperatively in the array, and widening a vibration energy taking working frequency domain; and S3, electrets which permanently hold polarization charges are adopted as an electrostatic field source, and based on the near-field hypothesis, the output power of the electrostatic assembly is optimized through the electrets which are arranged at intervals in polarity. The low-frequency environment vibration energy can be more efficiently collected, and the working frequency range and the power density are more considerable compared with those of other beam type low-frequency vibration energy taking methods.

The present application relates to the technical field of bulk acoustic wave resonators, and specifically provides a bulk acoustic wave resonator and a design method thereof, the method comprising the steps of: determining the scandium doping concentration and thickness corresponding to a plurality of piezoelectric layers according to a target effective electromechanical coupling coefficient and a target resonator frequency, and determining the electrode material and its corresponding acoustic impedance according to a target loss performance; for each piezoelectric layer, calculating the acoustic parameters, piezoelectric coupling parameters and static capacitance parameters according to its corresponding scandium doping concentration and thickness, the acoustic parameters including the acoustic impedance; calculating the interface impedance of adjacent layer structures according to the acoustic impedance of adjacent layer structures; inputting all acoustic parameters, all static capacitance parameters, all piezoelectric coupling parameters, electrode materials and all interface impedances into a Mason model to complete the bulk acoustic wave resonator design; the method enables the Mason model to comprehensively consider the influence of the physical parameter differences of multiple piezoelectric layers on the bulk acoustic wave resonator and the interface effects between the various layer structures.

The invention discloses a pipeline and a method for degrading PFOS (Perfluorooctane Sulfonate) by utilizing mechanical energy of water flow. The PFOS degradation pipeline comprises a pipeline main body and a composite piezoelectric layer loaded on the inner wall of the pipeline main body. The composite piezoelectric layer is formed by doping a semiconductor nano piezoelectric material in a piezoelectric matrix material; the semiconductor nano piezoelectric material is driven by water flow mechanical energy to generate redox active species by using water; the piezoelectric base material has selective adsorbability, so that low-concentration PFOS in water is enriched on the surface of the material. According to the invention, abundant water flow mechanical energy in a pipeline is utilized to drive piezoelectric catalysis, the catalytic activity of the material is regulated and controlled through double piezoelectric coupling and an interface effect, an in-situ, low-energy-consumption and defluorination degradation method for PFOS in water is constructed, additional energy input and additional medicaments are not needed, the development direction of a water treatment technology is met, and the energy-saving characteristic is distinct.

The present invention provides a method and device for suppressing edge ablation of a piezoelectric array adaptive oscillation acceleration off-position, and relates to the field of methods for suppressing edge ablation of an oscillation acceleration off-position. The method is based on a piezoelectric array adaptive oscillation acceleration off-position edge ablation method, comprising: S1, constructing a three-dimensional model of a piezoelectric element: using computer-aided design software, constructing a three-dimensional geometric model of the piezoelectric element, simulating its actual geometric shape and material properties, so as to perform detailed mechanical analysis. By defining the mechanical and electrical parameters of the piezoelectric material, inputting basic parameters such as Young's modulus, Poisson's ratio, piezoelectric constant and dielectric constant, ensuring that the basic data of the simulation is complete and reliable, and establishing the dynamic response equation of the piezoelectric element: using the piezoelectric coupling equation to accurately describe the dynamic response of the piezoelectric element under high-frequency oscillation conditions, ensuring the accuracy and precision of the simulation.

The application provides a piezoelectric coupling photocatalyst, a preparation method and application thereof, wherein the piezoelectric coupling photocatalyst can couple piezoelectric materials and semiconductor characteristics, combines the photocatalysis and piezoelectric catalysis principles, can realize all-weather algae inhibition with efficiency improvement and speed increase, can couple the wind energy, water wave energy, vibration and solar energy in nature, and provides a new principle and new idea for multi-path utilization of natural energy, energy saving and emission reduction, and has great potential in future energy environment applications.

This application provides a nano-confined piezoelectric coupled photocatalyst, its preparation method, and its application. The piezoelectric coupled photocatalyst provided in this application includes AgNbO3-Bi2Sn2O7, and the particle size of AgNbO3 and Bi2Sn2O7 is nanoscale. It can couple piezoelectric materials and semiconductor properties, combining the principles of photocatalysis and piezoelectric catalysis. This can not only improve efficiency and speed up all-weather algae suppression, but also couple natural wind energy, water wave energy, vibration, and solar energy into one, achieving the effect of energy saving and emission reduction.

The invention discloses a magnetic control piezoelectric / topological double-layer heterogeneous biological functionalized nerve scaffold as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively carrying out surface modification on magnetic nanoparticles and piezoelectric nanoparticles; dispersing the modified magnetic nanoparticles and piezoelectric nanoparticles in an inner-layer biological material solution to obtain an inner-layer spinning solution; dispersing a therapeutic drug into the outer-layer biological material solution to obtain an outer-layer spinning solution; the preparation method comprises the following steps: firstly, processing an inner-layer spinning solution to form an inner-layer fiber layer with an anisotropic topological structure; then switching to outer-layer spinning solution, and forming an outer-layer fiber layer with a disordered structure on the inner-layer fiber layer through an in-situ deposition method, so as to obtain a double-layer stent; and washing and drying the double-layer stent. According to the double-layer stent, a magnetic control piezoelectric coupling mechanism is adopted, an in-situ electrical stimulation and heterogeneous double-layer structure is generated through driving of an external magnetic field, and space-time cooperation of physical guidance and biochemical signals is achieved.

This invention discloses a triboelectric piezoelectric coupling vibration energy harvesting device, relating to the fields of smart wearable devices, biomedicine, environmental monitoring, and the Internet of Things. It includes an external excitation system, a shell, a base plate, an electromagnetic component, a piezoelectric component, and a friction component. The shell encloses the magnet and magnetic core of the electromagnetic component. The bottom of the shell is connected to the spring sheet of the piezoelectric component. The left and right sides of the piezoelectric sheet are connected to the conductors of the friction component. This invention utilizes the aforementioned triboelectric piezoelectric coupling vibration energy harvesting device, making full use of the device's space and transferring the damping generated by vibration to the friction between different materials. The reciprocating motion of the spring sheet is transferred to the deformation of the piezoelectric sheet. Through the mutual friction between the thin film and the copper foil, and the piezoelectric effect of the piezoelectric sheet, mechanical energy is converted into electrical energy to harvest more energy. Furthermore, the damping reduces the kinetic energy of the magnetic core, allowing more energy to be transferred to electromagnetic power generation.