194 results about "Piezoelectric composite" patented technology

The invention discloses a planar phased array ultrasonic transducer, and relates to the technical field of transducers, the planar phased array ultrasonic transducer comprises a 1-3 type piezoelectric composite board, a common positive electrode panel and a flexible circuit board, the 1-3 type piezoelectric composite board comprises a polymer frame and a plurality of PZT piezoelectric ceramic columns, all the PZT piezoelectric ceramic columns are embedded in the polymer frame in an array, and the PZT piezoelectric ceramic columns are connected with the flexible circuit board. One end of each PZT piezoelectric ceramic column is a positive electrode end, the other end of each PZT piezoelectric ceramic column is a negative electrode end, the common positive electrode panel is connected with the positive electrode ends of the PZT piezoelectric ceramic columns, the flexible circuit board is provided with a bonding pad area and at least one pin area, the bonding pad area is fixedly provided with a plurality of bonding pads, the pin area is fixedly provided with a plurality of pins, and the flexible circuit board is provided with a plurality of conductive terminals. All the pins, all the bonding pads and all the negative electrode ends of the PZT piezoelectric ceramic columns are in one-to-one correspondence, the bonding pads are electrically connected with the pins, and the bonding pads are connected with the negative electrode ends of the PZT piezoelectric ceramic columns; according to the invention, the PZT is applied to the planar phased array ultrasonic transducer.

The invention discloses an Internet of Things and AI energized smart energy multi-energy complementary heating control system, which relates to the technical field of smart energy heating control, and comprises an atomic layer deposition sensing module for realizing ultra-sensitive measurement of temperature and humidity; edge nodes are calculated through photons, and the data processing energy efficiency is improved; the shape memory alloy-piezoelectric composite execution module is used for accurate and rapid adjustment; the multi-scale heat coordination module is used for strengthening heat transmission; the magnetofluid sealing and regulating module is used for dynamically controlling the flow; the terahertz metasurface communication module guarantees high-speed communication, and the system optimizes energy complementation and intelligent regulation and control through multi-technology fusion. According to the invention, the sensing precision, the data processing speed and the execution precision are improved, the heat transmission efficiency is enhanced, the flow dynamic regulation and control and high-speed reliable communication are realized, the room temperature standard reaching rate is improved and the energy consumption is reduced through digital twin optimization control, and an efficient low-carbon scheme is provided for smart energy heating.

An air-coupled ultrasonic scanning platform for an air-coupled ultrasonic non-contact metrology of battery electrodes that maps the local variation in density and thickness, and detect defects during electrode casting and drying, includes: piezocomposite air-coupled transducers (Ultran) at 0.5 to 1 MHz that provide sufficient air coupling to enable sound waves to travel through air from a transmitting transducer, through the thin film electrode coated on metal current collector, and then into the receiving transducer. Non-contact, air-coupled ultrasound may be used as a technique for evaluating battery electrode films. An analytical model was derived from fundamental acoustic wave propagation principles to determine acoustic density. Voltage gain or acoustic density maps of electrode films revealed features that are not visually apparent, attributed to mass gradients.

The invention discloses piezoelectric catalysis-Fenton self-coupling staged underground water treatment equipment, and relates to the technical field of underground water pollution abatement, the piezoelectric catalysis-Fenton self-coupling staged underground water treatment equipment comprises a reactor main body, a piezoelectric-aeration water treatment module and a PVDF-HFP piezoelectric film array, the piezoelectric-aeration water treatment module is fixedly arranged in a piezoelectric-aeration catalysis reaction zone, and the PVDF-HFP piezoelectric film array is fixedly arranged in the reactor main body; the PVDF-HFP piezoelectric film array is fixedly arranged in the Fenton-piezoelectric catalysis enhanced reaction zone; the piezoelectric-aeration water treatment module comprises a micro-nano bubble generator, a micro-nano diaphragm and a piezoelectric composite filler, a filler containing cavity is formed between the micro-nano bubble generator and the micro-nano diaphragm, and the piezoelectric composite filler is filled in the filler containing cavity; the micro-nano bubble generator is connected with the dissolved air pump through a first air inlet pipe; and a Fenton filler is loaded on the surface of the PVDF-HFP piezoelectric film array. According to the invention, high-efficiency and low-consumption remediation and treatment of the water body can be realized in an underground water environment.

The invention provides a spherical hollow piezoelectric composite material and a preparation method thereof, and belongs to the technical field of piezoelectric materials. According to the method disclosed by the invention, the precise manufacturing of the complex three-dimensional structure of the piezoelectric composite material is realized, and the controllability of the structure can be realized; a 1-3 type (namely a two-phase piezoelectric composite material composed of one-dimensionally arranged piezoelectric phases and three-dimensionally communicated polymer phases) piezoelectric composite material is of a periodic array structure formed by embedding piezoelectric ceramic columns into a resin matrix, and precise arrangement and complex three-dimensional shape control of the ceramic columns are difficult to realize by a traditional process. According to the 3D photocuring printing technology, liquid photosensitive resin is cured layer by layer, so that the diameter, spacing and spatial distribution of piezoelectric materials (such as ceramic columns) can be accurately controlled, complex structures such as a spherical polymer hollow frame are formed, and the degree of freedom of material design is remarkably improved.

The invention discloses a polyaryletherketone composite implant material and a preparation method and application thereof, and belongs to the technical field of medical materials.The preparation method of the polyaryletherketone composite implant material comprises the following steps that a carbon fiber reinforced polyaryletherketone substrate with the surface provided with a groove structure and conductivity is prepared; based on a precipitation method, a calcium compound, a magnesium compound and a phosphoric acid aqueous solution are used for preparing white calcium stone; the preparation method comprises the following steps: carrying out surface modification on the white calcium phosphate by utilizing polydopamine, so as to obtain modified white calcium phosphate; adding the modified white calcium phosphate and a degradable piezoelectric polymer into a solvent, and mixing to obtain a mixed solution; and coating a carbon fiber reinforced polyaryletherketone substrate with the mixed solution, and performing drying and annealing treatment to form a coating, thereby obtaining the polyaryletherketone composite implant material. According to the invention, the degradable piezoelectric composite coating doped with the white phosphorus calcium stone, which has piezoelectric characteristics and ion release capability, is constructed, so that double biomimetic effects of an electric signal and a chemical signal in a bone healing microenvironment are realized.

The invention relates to a dielectric elastomer-piezoelectric composite multi-source energy collection device for a non-intrusive electric field sensor, and belongs to the technical field of power system self-powered sensors. The device comprises a base, a dielectric elastomer unit, a piezoelectric cantilever beam, a mass block and a rectification energy storage circuit. The dielectric elastomer deforms under the action of an alternating electric field, the piezoelectric cantilever beam is driven through coupling to generate mechanical vibration, and the piezoelectric layer further converts mechanical energy into electric energy to be output. The resonant frequency of the system is adjusted by setting the mass block, so that the resonant frequency is matched with the external electric field frequency or the environment vibration frequency, and the energy conversion efficiency is optimized. The device can collect external electric field energy in a non-intrusive mode and provide a stable power supply required by a low-power-consumption sensor. The device is compact in structure, high in sensitivity and suitable for electric field monitoring in scenes such as ultrahigh-voltage power transmission lines and transformer substations, and provides reliable energy support for self-powered sensors of power equipment.

The invention discloses a high-precision self-adaptive control method and system for a floating sealing device of a lithium extraction rotary kiln, and relates to the technical field of intelligent control, and the method comprises the steps: collecting the multi-modal characteristic parameters of the operation state of the rotary kiln, inputting the multi-modal characteristic parameters into a physical information neural network, solving a thermoelastic mechanical partial differential equation, and obtaining the high-precision self-adaptive control of the floating sealing device of the lithium extraction rotary kiln. The method comprises the steps of obtaining a deformation field prediction matrix, outputting a deformation field prediction matrix, solving a multi-target optimization model with minimum leakage rate and wear energy consumption as a joint target based on the deformation field prediction matrix, outputting a sealing compensation instruction vector, and driving a magneto-rheological-piezoelectric composite execution mechanism to complete instruction control of a sealing ring based on the sealing compensation instruction vector. Collecting feedback result data controlled by the instruction, adjusting the weight of each weight coefficient in the multi-objective optimization function on line by adopting a reinforcement learning algorithm based on the feedback result data, and feeding back the adjusted weight to the multi-objective optimization model; and the control stability of the rotary kiln under complex working conditions is ensured.

The invention discloses an active regulation and control type piezoelectric acoustic coding metasurface and a use method thereof in the acoustic field, the acoustic coding metasurface comprises a plurality of active regulation and control type piezoelectric acoustic coding units, and each active regulation and control type piezoelectric acoustic coding unit comprises a shell, a piezoelectric composite sheet and an external circuit; the two ends of the shell are open, and piezoelectric compacts are embedded in the shell. The piezoelectric compacts divide the interior of the shell into two symmetrical Helmholtz resonators. The piezoelectric composite sheet is connected with an external circuit of the shell; the external circuit switches open and short circuit states, so that the transmission phase difference of sound waves with working frequency is pi after passing through the active regulation and control type piezoelectric acoustic coding unit, and the sound waves are respectively used as a coding type 0 and a coding type 1. According to the invention, the problems of insufficient reconfigurable capability and slow switching response speed of the existing acoustic coding metasurface are solved.

A method for preparing a flexible lead-free piezoelectric composite film, in which a rare-earth-doped SrSbxSc2-xTaCl2O8 precursor powder is prepared and coated with a BaTiO3 shell to form core-shell nanoparticles, and the core-shell nanoparticles are dispersed in a polyvinylidene fluoride (PVDF) matrix to obtain the flexible lead-free piezoelectric composite film. An electronic device including such piezoelectric composite film is also provided.

A package structure of a piezoelectric micromachined ultrasonic transducer includes a silicon substrate, a first protective layer, a piezoelectric composite film, a first metal layer, a second metal layer, a first pad, a second pad and a second protective layer. The silicon substrate is provided with a first through hole and a second through hole. The first protective layer is provided with a groove, a first communication hole and a second communication hole. The piezoelectric composite film includes a first electrode layer and a second electrode layer respectively filling the first communication hole and the first through hole, and the second communication hole and the second through hole so as to be connected to the first metal layer and the second metal layer. A surface of the second protective layer away from the piezoelectric composite film is a flat surface.

The invention relates to the technical field of uranium extraction fiber membranes, and discloses a preparation method of an MXene / PVDF / PAO photo-thermal-piezoelectric composite fiber membrane, and the preparation method comprises the following steps: S1, dissolving PAN in DMF, adding hydroxylamine hydrochloride and NaOH, and stirring to obtain a spinning solution I; s2, PVDF is dissolved in DMF, multiple layers of MXene materials are added, and a uniform spinning solution II is obtained through stirring; and S3, preparing the MXene / PVDF / PAO fiber membrane from the spinning solution I and the spinning solution II in a double-spinning form by using an electrostatic spinning device. And jointly assembling the PAO, the PVDF nano particles and the Mxene nano sheets into the electrostatic spinning membrane. Wave energy excites the piezoelectric effect of PVDF, and light energy is absorbed by Mxene. Compared with an existing scheme, water flow resistance is smaller, adsorption sites are more, and large-scale sea tests are better facilitated.

The invention belongs to the technical field of functional materials, and particularly relates to a 1-3 type lead metaniobate piezoelectric composite material and a preparation method and application thereof. The composite material takes lead metaniobate ceramic with a tungsten bronze structure as a one-dimensional piezoelectric phase and takes epoxy resin as a three-dimensional polymer phase. The ratio [lambda] / T of the transverse periodic dimension ([lambda]) of the ceramic column to the thickness (T) of the composite material is 0.1-0.6. The preparation method is characterized in that the ceramic column array is formed through precise cutting, cutting parameters are controlled to achieve the lambda / T ratio, and then resin encapsulation, curing, polishing and electrode preparation are conducted. According to the invention, the electromechanical coupling performance and stability of the composite material at ultrahigh temperature are synergistically improved by selecting the lead metaniobate ceramic with high Curie temperature and combining specific lambda / T structural parameters. The obtained material can still keep good performance at 350 DEG C, the maximum thickness electromechanical coupling coefficient kt can reach 0.35, and the material is suitable for high-temperature acoustic logging and underwater acoustic receiving transducers.

This invention discloses an interlayer confined piezoelectric composite film of graphene oxide, its electric field-driven preparation method, and its application. The preparation method includes: preparing a graphene oxide dispersion using the Hummers method and filtering it to form a graphene oxide film; placing the graphene oxide film in an electric-driven device, introducing different precursor solutions on both sides of the film, and driving the precursor components to migrate into the interlayer confined space of the graphene oxide under the action of an applied electric field; under the synergistic effect of electric field driving and interlayer confinement, the precursors entering the interlayer react and crystallize in situ to form a piezoelectric functional phase. The prepared composite film can generate piezoelectric polarization under mechanical stimulation conditions and can be used for ion selective adsorption / separation, especially suitable for the selective adsorption / separation of uranium and vanadium ions in high-salt water systems. This invention achieves a synergistic improvement in interfacial charge regulation and ion selectivity regulation by constructing a piezoelectric functional phase in situ within the interlayer confined space of graphene oxide.

This invention introduces an electrochromic spiral-coated piezoelectric composite yarn and its preparation method, belonging to the field of functional materials technology. It includes: a silver-plated nylon core yarn and, sequentially disposed outside the silver-plated nylon core yarn, a nanofiber layer, an encapsulation layer, a transparent conductive layer, an electrochromic active layer, an ion gel electrolyte layer, and an ion storage layer. The nanofiber layer is a PVDF / BaTiO3 nanofiber yarn spirally and cross-coated on the surface of the silver-plated nylon core yarn. The transparent conductive layer is formed by curing a PEDOT:PSS conductive polymer dispersion. The electrochromic active layer is tungsten trioxide nanowires uniformly deposited on the transparent conductive layer. The ion storage layer is a Prussian blue nanolayer. This invention solves the problems of poor environmental adaptability, insufficient mechanical durability, and unstable piezoelectric output in existing piezoelectric yarns.

The invention relates to a flow polarization process for improving the polarization efficiency of a ceramic / polymer-based piezoelectric composite material, and belongs to the technical field of flexible piezoelectric composite materials. Piezoelectric nanorods selected by the composite material are consistent in electric dipole orientation under a mesoscale (can be prepared by a molten salt method, a hydrothermal method or an electrostatic spinning method), a thermosetting polymer is used as a matrix (such as polydimethylsiloxane, thermosetting epoxy resin and the like), and polarity orientation of piezoelectric filler in the polymer matrix is regulated and controlled by means of electrophoresis, so that the piezoelectric composite material is obtained. The orientation of the electric dipoles of the material is consistent under the macroscopic scale, the material is firstly polarized and then molded, and the polarization efficiency of the material is remarkably improved.

The invention relates to the technical field of aquaculture water treatment, and discloses a fishpond multi-stage purification and filtration system and a filtration dam device.The fishpond multi-stage purification and filtration system comprises a multi-stage flow guide filtration dam, a piezoelectric-biological coupling reactor and a self-adaptive resonance control system.The piezoelectric-biological coupling reactor is filled with piezoelectric composite biological filler, and a micro electric field is generated through ultrasonic excitation; the piezoelectric-biological coupling reactor and the biological membrane cooperate to degrade pollutants, the adaptive resonance control system monitors an acoustic impedance characterization value in the piezoelectric-biological coupling reactor in real time, ultrasonic output parameters are adaptively adjusted through a differential algorithm according to deviation, and dynamic regulation and control and in-situ updating of the thickness of the biological membrane are achieved; and an anoxic autotrophic denitrification and reoxygenation reflux device is also arranged at the rear end of the system. Through microcosmic coupling of piezoelectric catalysis and biodegradation and intelligent closed-loop feedback control, synchronous and efficient removal of refractory organic matters and ammonia nitrogen is realized, and high activity and long-acting stable operation of the purification system are ensured.

A piezoelectric MEMS loudspeaker. The application discloses a MEMS structure, comprising: a substrate comprising an inner ring body and an outer ring body connected by a connecting rod, having a first cavity between the inner ring body and the outer ring body, and having a second cavity in the inner ring body; a piezoelectric composite vibration layer formed above the substrate, comprising an edge portion formed above the outer ring body and a center portion formed above the inner ring body, having a partition gap between the edge portion and the center portion. In summary, the piezoelectric MEMS loudspeaker provided by the application comprises an edge portion and a center portion, wherein the edge portion is used to generate a high-frequency sound pressure level, and the center portion is used to generate a low-frequency sound pressure level. The combination of the edge portion and the center portion makes the piezoelectric MEMS loudspeaker have a relatively flat sound pressure level frequency response curve with a wider range, thereby improving the auditory effect in the entire frequency band.

The application discloses an interdigital electrode type piezoelectric composite energy collector and a preparation method and application thereof. After piezoelectric ceramic nanowires and piezoelectric polymer powder are fully mixed, the piezoelectric composite material with the piezoelectric ceramic nanowires arranged in a direction is obtained through 3D printing, and an interdigital electrode is loaded on the surface of the piezoelectric composite material, the positive and negative electrodes are connected, and a film is coated, and the energy collector is obtained. The energy collector is based on the synergistic effect among the piezoelectric ceramic nanowires, the piezoelectric polymer powder and the interdigital electrode, the vibration energy is fully absorbed by controlling the directional arrangement of the piezoelectric ceramic nanowires, and the output power of the energy absorber is greatly provided. The wearable energy collector obtained by using the piezoelectric composite material has the advantages of simple structure, stable performance and high output power, and can fully absorb the vibration energy generated in the human motion process. The maximum output voltage can reach 17V under the pressure of 180KPa, and the maximum load power can reach 5.6muW.

The present application relates to the technical field of underwater acoustic transducer, in particular to a method for preparing curved piezoelectric composite material by using shape memory high polymer material, comprising the following steps: step 1: according to the required shape and size, corresponding shape memory high polymer material pouring tooling is prepared; step 2: shape memory high polymer material is poured and solidified; step 3: the solidified shape memory high polymer material is taken out, heated to above its glass transition temperature to soften, then clamped flat with two metal plates, and then cooled into flat plate type shape memory high polymer material; step 4: piezoelectric ceramic plate is firmly pasted on the flat plate type shape memory high polymer material; step 5: a series of cutting is carried out on the piezoelectric ceramic along the X direction, and a series of cutting is carried out on the piezoelectric ceramic along the Y direction, the curved piezoelectric composite material is prepared by the method, the curved surface is uniform and controllable, the preparation process is simple and easy to operate, and the method is suitable for large-scale production of various curved piezoelectric composite materials.

The utility model provides a surface acoustic wave device. The surface acoustic wave device comprises a piezoelectric composite substrate and a metal structure located on the piezoelectric composite substrate. The piezoelectric composite substrate comprises a silicon substrate; the crystal elastic constant of the silicon substrate is a six-order matrix Cij, 0lt; i < = 6, 0lt; j < = 6, and i and j are integers; the silicon substrate has an Euler angle, and the absolute value of C15 in an elastic constant Cij defined by the Euler angle is greater than or equal to 2 * 10 < 9 > Pa. Namely, the Euler angle is set, and the absolute value of the elastic constant C15 of the silicon substrate is defined to be greater than or equal to 2 * 10 < 9 > Pa, so that the parasitic response generated by a high-order stray mode at high frequency is effectively eliminated or reduced, and the suppression capability of a stop band is improved. Compared with the prior art, the surface acoustic wave device provided by the utility model not only has a better inhibition effect on a high-frequency parasitic mode and improves the performance of the device, but also does not occupy the effective area of the device, is beneficial to the miniaturization development of the device, and is simple in process preparation.

The application discloses a tree-shaped underwater fish gathering power generation device and a working method thereof, which comprises a float, a power generation module and a load module; the load module comprises a shell, a chargeable power supply, a lifting unit, a storage box and a pressure pump; the power generation module comprises a power generation carrier, a delivery main pipe and a plurality of piezoelectric composite flexible films. The piezoelectric composite flexible films are fixed on the power generation carrier like cantilever beams, fish groups are attracted to approach the device by releasing the mixture of fish gathering elements and feed at different positions on the power generation carrier, the disturbance or collision force of water flow and fish groups on the piezoelectric composite flexible films makes the piezoelectric composite flexible films bend and deform, the piezoelectric composite flexible films generate electric current and store due to the piezoelectric effect, and the power supply can supply each release mechanism and other effective loads. The application can be used on the effective loads at the same time, and can supply power for far-sea underwater cableless detection and early warning, resource monitoring and other tasks, and can minimize the damage to marine organisms and ecology.

A piezoelectric composite energy harvester (100) is disclosed, comprising a piezoelectric element (102) and an elastic cover layer (110). The piezoelectric element comprises a first electrode (104), a second electrode (106), and a piezoelectric layer (108), the piezoelectric layer (108) comprising a cross-linked silicone elastomer matrix and piezoelectric particles dispersed within the cross-linked silicone elastomer matrix. The elastic cover layer (110) is disposed over the exterior of the second electrode (106). The piezoelectric composite energy harvester is configured to bend, expand, contract, rotate, tilt, and / or move in any spatial direction.

The invention discloses a characteristic influence analysis method for an impulse sound source circular tube-shaped composite receiving transducer, which relates to the related technical field of transducers, and comprises the following steps: constructing a simulation model of a 2-2 type piezoelectric composite circular tube-shaped receiving transducer through COMSOL; after harmonic response analysis is carried out on the simulation model, factors influencing the performance of the 2-2 type piezoelectric composite circular tube receiving transducer are obtained through parameters and constraint conditions of the simulation model, and design improvement is carried out on the 2-2 type piezoelectric composite circular tube receiving transducer according to the influence factors. According to the invention, an important new technical basis is provided for the research of the impulse sound source depth detection technology receiving transducer.

This invention provides a modified ferroelectric polymer composite film, its preparation method, and its applications, belonging to the field of piezoelectric composite material technology. The modified ferroelectric polymer composite film includes a ferroelectric polymer base film and a plurality of composite nanoparticles and multi-walled carbon nanotubes dispersed within the ferroelectric polymer base film. The composite nanoparticles have a core-shell structure, comprising a core and an inner shell layer and an outer shell layer sequentially surrounding the core. The core comprises a composite piezoelectric ceramic material composed of potassium sodium niobate and barium titanate, the inner shell layer comprises polydopamine, and the outer shell layer comprises MnO2. This invention fully utilizes the synergistic effect of the composite nanoparticles and multi-walled carbon nanotubes on the dielectric and piezoelectric properties of P(VDF-TrFE) materials, thereby preparing a composite material with high dielectric constant, low dielectric loss, and excellent piezoelectric properties to meet the stringent performance requirements of high-performance sensors and other application fields.

This invention relates to the field of aquaculture water treatment technology, and discloses a multi-stage purification and filtration system and filter dam device for fish ponds. The system includes a multi-stage flow-guiding filter dam, a piezoelectric-biocoupled reactor, and an adaptive resonant control system. The piezoelectric-biocoupled reactor is filled with piezoelectric composite biological filler. A micro-electric field is generated by ultrasonic excitation, which works synergistically with the biofilm to degrade pollutants. The adaptive resonant control system monitors the acoustic impedance value within the piezoelectric-biocoupled reactor in real time and adaptively adjusts the ultrasonic output parameters based on deviation using a differential algorithm, achieving dynamic control and in-situ renewal of the biofilm thickness. The system also includes anoxic autotrophic denitrification and reoxygenation reflux devices at the back end. Through the microscopic coupling of piezoelectric catalysis and biodegradation, and intelligent closed-loop feedback control, the system achieves simultaneous and efficient removal of recalcitrant organic matter and ammonia nitrogen, ensuring the high activity and long-term stable operation of the purification system.

The application discloses a kind of polyaryletherketone composite implant materials and preparation method and application, and belongs to medical material technical field, wherein, the preparation method of the polyaryletherketone composite implant material includes the following steps: preparation surface has recess structure and the carbon fiber reinforced polyaryletherketone base of conductivity;Based on precipitation method, white brushite is prepared using calcium compound, magnesium compound and phosphoric acid aqueous solution;White brushite is surface modified using polydopamine, to obtain modified white brushite;Modified white brushite is mixed with degradable piezoelectric polymer into solvent, to obtain mixed solution;Mixed solution is coated on carbon fiber reinforced polyaryletherketone base, after drying, annealing treatment, form coating, to obtain polyaryletherketone composite implant material.The application constructs white brushite doped degradable piezoelectric composite coating with piezoelectric characteristics and ion release capacity simultaneously, realizes the dual bionics of electric signal and chemical signal in bone healing microenvironment.

The invention discloses a piezoelectric catalysis tube forming process suitable for a water pressure self-excitation reaction, and particularly relates to the field of piezoelectric catalysis tube forming, and the piezoelectric catalysis tube forming process comprises the following steps: performing dispersion classification and fluid regulation on a piezoelectric composite material to generate preformed base material data with uniform frequency and stable fluid; a pressure effect sensitive path area and a flow velocity wall layer area are formed by adopting confinement flow channel segmentation and space positioning pressing treatment; based on limited pressure freezing treatment and heating stretching treatment, internal stress gradient distribution and structure stabilizing treatment are completed; a directional oscillation area and a manifold optimization area are formed by impressing, folding and pressing the piezoelectric catalysis tube. A micro-pressure-effect sensitive path, a flow velocity response enhanced wall layer and internal stress gradient distribution are constructed in the forming process of the piezoelectric catalytic tube, so that natural induction of local deformation and continuous piezoelectric potential generation under the hydrodynamic condition are realized, and the problem that catalytic reaction cannot be self-excited and continuous in a low-energy-consumption environment is solved.

An acoustic transducer array and method of making same. A first metal layer is deposited on a first side of a piezoelectric composite to form a common electrode and a second metal layer is provided over the obverse side. Portions of the second metal layer are removed to create a plurality of individual electrodes. A third metal layer may be deposited onto the plurality of individual electrodes, the third metal layer being thicker than the second metal layer. The individual electrodes extend beyond the piezoelectric composite in the elevation direction to create electrode leads. Metal layers may be provided by lithography, a wireframe or a foil sheet.

The invention discloses a flexible self-compensation time-varying Doppler metasurface system and a radar detection deception method thereof, and relates to the technical field of flexible electronics, and the system comprises a plurality of flexible multi-layer metasurface units and a dynamic regulation and control module. The flexible multilayer metasurface unit is provided with a stretchable conductive patch layer, a flexible substrate layer, a positive electrode layer, a piezoelectric composite layer and a negative electrode layer from top to bottom, the patch layer is provided with a variable capacitance diode and a strain sensor, and the phase of a reflected wave is regulated and controlled by adjusting the bias voltage of the variable capacitance diode; the dynamic regulation and control module is composed of a signal processing unit, a resistance monitoring circuit and a bias network and achieves signal receiving, phase calculation and regulation and control. Meanwhile, a radar detection deception method is provided, a strain sensor and a resistance monitoring circuit are used for collecting data, a compensation phase is calculated in combination with a deformation quantity-resistance-phase model pre-stored in a signal processing unit, a variable capacitance diode is driven through signal conversion, and 0-360-degree phase continuous regulation and control are achieved.