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28 results about "Piezomagnetism" patented technology
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Piezomagnetism is a phenomenon observed in some antiferromagnetic crystals. It is characterised by a linear coupling between the system's magnetic polarisation and mechanical strain. In a piezomagnetic material, one may induce a spontaneous magnetic moment by applying physical stress, or a physical deformation by applying a magnetic field.
Giant magnetostriction bar multi-physical field coupling dynamic characteristic monitoring system
The invention provides a giant magnetostrictive bar multi-physics field coupling dynamic characteristic monitoring system. The giant magnetostrictive bar multi-physics field coupling dynamic characteristic monitoring system comprises a magnetic field loading module, a mechanical loading module, a thermal environment control module, a signal detection module and a signal processing module. The magnetic field loading module generates a broadband superimposed magnetic field through a direct-current bias coil and an alternating-current driving coil; the mechanical loading module applies prestress by adopting a hydraulic device; the thermal environment control module accurately controls the temperature within the range of-50 DEG C to 300 DEG C. The signal detection module is integrated with a B measuring coil, an H measuring coil, a laser displacement sensor, a pressure sensor and an acoustic emission sensor to realize high-speed synchronous acquisition of multi-physical field parameters; and the signal processing module transmits the data to the upper computer in real time based on the data acquisition card for recording and analysis. According to the system, a magnetic-force-thermal coupling excitation environment is constructed, the magnetostriction coefficient, the piezomagnetic coefficient, the magnetic conductivity and the loss angle of the giant magnetostriction bar are obtained, and the system is suitable for comprehensive evaluation of the performance of the bar under different bias magnetic fields, prestressing forces and temperature conditions.
Owner:HUNAN UNIV
Hump humping vehicle weight measuring method and device based on strain type weighing sensor
The invention discloses a hump humping vehicle weight measuring method and device based on a strain type weighing sensor, and the method and the device are corresponding schemes, in the scheme, the strain type weighing sensor is used for replacing a plug pin type piezomagnetic weighing sensor, and a signal isolation and acquisition circuit is used for rapidly reading the voltage of the sensor; on one hand, the measurement precision of the weighing equipment can be improved by utilizing the strong calculation and storage capability of the data processing device, and on the other hand, the weight information is obtained through waveform analysis, and a large amount of waveform data is stored in a quite long time. And a reliable basis is provided for equipment maintenance. Meanwhile, weight waveform analysis can be carried out according to the collected data, data abnormity alarm and equipment maintenance guidance are achieved, and the problem that existing maintenance difficulty is large is better solved.
Owner:CHINA ACADEMY OF RAILWAY SCI CORP LTD +3
Super magnetostrictive rod multi-physical field coupling dynamic characteristic monitoring system
The application provides a kind of super magnetostrictive bar multi-physical field coupling dynamic characteristic monitoring system, including magnetic field loading module, mechanics loading module, thermal environment control module, signal detection module and signal processing module.Magnetic field loading module generates wide frequency superimposed magnetic field through DC bias coil and AC driving coil;Mechanics loading module applies pre-stress using hydraulic device;Thermal environment control module accurately controls temperature in the range of-50℃ to 300℃.Signal detection module integrates B measurement coil, H measurement coil, laser displacement sensor, pressure sensor and acoustic emission sensor, realizes high-speed synchronous acquisition of multi-physical field parameters;Signal processing module transmits data to host computer for recording and analysis in real time based on data acquisition card.The system constructs magnetic-force-thermal coupling excitation environment, obtains magnetostrictive coefficient, piezomagnetic coefficient, magnetic permeability and loss angle of super magnetostrictive bar, and is suitable for comprehensive evaluation of bar performance under different bias magnetic field, pre-stress and temperature conditions.
Owner:HUNAN UNIV
Calculation method of contact magnetoelectric coupling variables of piezoelectric substrates containing piezomagnetic particles
ActiveCN120180836BDesign optimisation/simulationSpecial data processing applicationsSimulation basedContact model
This invention discloses a method for calculating the contact magnetoelectric coupling variables of a piezoelectric matrix containing piezoelectric magnetic particles. This method, which pertains to the field of novel contact applications for magnetoelectric functional devices, includes a general model for achieving the functional properties of MEE composite materials through contact loading. Using a contact model of a MEE composite material containing piezoelectric magnetic particles in a piezoelectric matrix as an example, the method employs finite element numerical simulation based on the constitutive models of the piezomagnetic and piezoelectric phases and multi-physics field coupling theory to systematically reveal the mechanism by which the magnetoelectric coupling variables are controlled by force loading.
Owner:FUFENG QINWEI ASH IND CO LTD
Preparation method and application of functionally gradient piezomagnetic-piezoelectric material sensor
PendingCN121063932ASubsonic/sonic/ultrasonic wave measurementForce measurement using piezo-electric devicesCrystallinityPiezomagnetism
The invention provides a preparation method and application of a functional gradient piezomagnetic-piezoelectric material sensor, and relates to the technical field of material science and sensors, and the preparation method comprises the step of providing a substrate material which is a composite material with piezomagnetic performance and piezoelectric performance. And coating piezomagnetic-piezoelectric material layers on the surface of the substrate material layer by layer to form a functional gradient structure. And carrying out heat treatment on the piezomagnetic-piezoelectric material layer, and regulating and controlling the crystallinity and the grain size of the piezomagnetic-piezoelectric material through the heat treatment, so that the overall sensor performance of the material is improved. According to the preparation method and application of the functionally gradient piezomagnetic-piezoelectric material sensor, the stability and sensitivity of the sensor are greatly enhanced through an optimized multi-layer structure and a precise heat treatment process, and the response performance of the sensor can be kept efficient and stable in an extreme environment.
Owner:LANZHOU INST OF TECH
A piezomagnetic-piezoelectric semiconductor device based on local magnetic field regulation
The present invention discloses a piezomagnetic-piezoelectric semiconductor device based on local magnetic field regulation, which relates to the technical field of semiconductor design. The piezomagnetic-piezoelectric semiconductor device is composed of a first piezomagnetic layer, a second piezomagnetic layer, a piezoelectric semiconductor layer, electrodes, a coil, a DC current source, and a power supply; both ends of the piezoelectric semiconductor layer are fixedly connected to the electrodes, and the electrodes are connected in series with the power supply; the first piezomagnetic layer, the piezoelectric semiconductor layer, and the second piezomagnetic layer are connected in sequence, and the first piezomagnetic layer, the second piezomagnetic layer, and the piezoelectric semiconductor layer are arranged in the coil, and both ends of the coil are connected in series with the DC current source. Different from the traditional PN junction which is limited to forward circuit conduction and reverse circuit cut-off, this device can achieve forward circuit conduction, circuit cut-off, and reverse circuit conduction, that is, three states of the circuit.
Owner:ZHEJIANG UNIV
Magic cube corner block core seat and corner block full-automatic assembling machine
ActiveCN222552745Ureasonable designhigh degree of automationAssembly machinesMetal working apparatusStructural engineeringMachine
The utility model provides a magic cube corner block core seat and corner block full-automatic assembling machine which comprises a machine frame, and a corner block petal rotating disc mechanism and a corner block core seat rotating disc mechanism are installed on the machine frame. A first angle block petal feeding mechanism, an angle block core seat feeding mechanism, a first piezomagnetic mechanism, a second piezomagnetic mechanism, a third piezomagnetic mechanism, a magnet detection mechanism, an angle block core seat transfer mechanism and a second angle block petal feeding mechanism are sequentially mounted on the rack in the rotating direction of the angle block petal turntable mechanism and the angle block core seat turntable mechanism; a third angle block petal feeding mechanism, a finished product pressing detection mechanism, a finished product discharging mechanism and a defective product discharging mechanism. The magic cube corner block core base and corner block full-automatic assembling machine is reasonable in design, high in automation degree, capable of achieving automatic feeding, piezomagnetism and detection of the corner block core bases and automatic feeding, pressing and discharging of corner block petals, high in assembling efficiency and good in quality.
Owner:GAN CUBE INC
A method and system for analyzing relative changes in ground stress
ActiveCN119803735BForce measurement by measuring magnetic property varationForce/torque/work measurement apparatus calibration/testingEngineeringData mining
The present invention discloses a method and system for analyzing relative changes in geostress, comprising: step S1, acquiring piezomagnetic geostress monitoring data; step S2, deriving additional stress from the piezomagnetic geostress monitoring data using the least squares method; and step S3, deriving current stress based on the change in the additional stress. The technical solution of the present invention can effectively determine the relative changes in the stress field and reveal the relationship between regional stress field activity and earthquakes.
Owner:INST OF GEOMECHANICS
Underground engineering surrounding rock supporting structure distributed coupling monitoring system based on multi-source sensing
PendingCN121475461AForce measurement by measuring magnetic property varationForce/torque/work measurement apparatus calibration/testingMonitoring systemTransducer
The invention relates to the technical field of geotechnical engineering monitoring, and discloses an underground engineering surrounding rock supporting structure distributed coupling monitoring system based on multi-source sensing, which comprises a plurality of intelligent anchor rod sensing units distributed and deployed along an underground engineering surrounding rock supporting structure, and the intelligent anchor rod sensing units form a sensing network through sound wave communication; and the piezomagnetic effect transduction module is used for measuring the axial stress of the intelligent anchor rod sensing unit. By utilizing the advantage of physical stability of acoustic elasticity measurement, periodic dynamic calibration is carried out on a piezomagnetic measurement result which is easily influenced by the environment to generate long-term drifting, the bimodal coupling measurement mode fundamentally solves the problem of measurement data misalignment caused by material aging or temperature and humidity change of a traditional single sensor, and the measurement accuracy is improved. High reliability and consistency of monitoring data in the whole life cycle can be guaranteed without manual intervention, and the accuracy basis of underground engineering safety assessment is remarkably improved.
Owner:POWERCHINA HUADONG ENG CORP LTD
A multi-mode controlled deep well geostress monitoring probe
ActiveCN120800601BSurveyForce measurement by measuring magnetic property varationStress distributionMechanical engineering
This invention belongs to the field of geostress monitoring technology and discloses a multi-mode controlled deep well geostress monitoring probe, comprising: a base, serving as the supporting structure for the entire geostress monitoring probe; the multi-mode monitoring structure includes: a guide seat, a clamping structure, a motor base, a first drive component, a meshing structure, a second drive component, a threaded drive structure, a plate, a guide wedge, a piezomagnetic sensor, and a wedge seat; the clamping structure is connected to the base through the guide seat. Through the synergistic effect of the multi-mode monitoring structure, the monitoring probe can accurately complete stress monitoring at multiple circumferential points on the borehole's circular cross-section, breaking through the limitations of traditional single-point monitoring. After the stress data at each point is summarized and processed, it can completely present the stress distribution characteristics of the circular cross-section structure such as the inner wall of the deep well, avoiding the deviation of single-point stress monitoring, and providing comprehensive and objective data support for the assessment of the real-time continuous changes in deep geostress state.
Owner:INST OF GEOMECHANICS
A method for improving the piezomagnetic coefficient of iron-based amorphous alloys based on pulsed laser technology
ActiveCN119634997BConverting sensor output electrically/magneticallyLaser beam welding apparatusLaser technologyPulsed laser beam
The present invention discloses a method for improving the piezomagnetic coefficient of an iron-based amorphous alloy based on pulsed laser technology, which belongs to the field of pulsed laser technology. This method uses a pulsed laser beam to etch parallel linear laser marks on the surface of an iron-based amorphous alloy to improve the piezomagnetic coefficient of the iron-based amorphous alloy; wherein the pulsed laser mark spacing is 15 to 30 mm, and the pulsed laser mark width is 5 to 20 mm. The present invention adjusts the laser power, the width and spacing of the periodic linear laser marks, and processes the surface of the iron-based amorphous alloy. The saturation magnetostriction coefficient and the maximum piezomagnetic coefficient are significantly improved, and the material still maintains the characteristics of the amorphous structure and has excellent plasticity.
Owner:NANJING NORMAL UNIVERSITY
Spin crossover complex with low-pressure sensitivity as well as preparation method and application of spin crossover complex
PendingCN120665120AForce measurement by measuring magnetic property varationIron organic compoundsSalicylaldehydeThio-
The invention relates to a spin crossover complex with low-pressure sensitivity and a preparation method and application thereof, 5-chlorine-salicylaldehyde reacts with thiosemicarbazide to obtain a ligand (5-chloro-2-hydroxybenzylidene) hydrazino thioamide, the ligand is mixed with iron ions, self-assembly is performed under specific conditions to obtain the spin crossover complex, and the expression of the spin crossover complex is [Fe < III > (H-5-Cl-thsa) (5-Cl-thsa). The material can trigger a spin state transition temperature (Tc) to move to a room temperature range under micro pressure, and has high pressure sensitivity, and meanwhile, the transition temperature is close to the room temperature; the spin crossover material can be used as a piezomagnetic material, can be used for a pressure sensor device, and provides an innovative solution for developing a high-precision, low-power-consumption and miniaturized pressure sensor.
Owner:NANKAI UNIV
An integrated digestion method and system with multi-field synergistic enhancement
The present invention discloses an integrated digestion method and system with multi-field collaborative enhancement. The integrated digestion method with multi-field collaborative enhancement includes: applying an electric field to an electro-digestion module to light up a light-emitting module and activate a photo-thermal module; injecting a water sample to be tested and an acid solution into a reaction chamber to activate a piezomagnetic module; the electro-digestion module electrolyzes the water sample to be tested to generate hydrogen peroxide, and the hydrogen peroxide is enriched in the photo-thermal module for Fenton-like oxidation; the photo-thermal module generates heat for thermal digestion and promotes Fenton-like oxidation; the piezomagnetic module generates a magnetic field to vibrate the water sample to be tested and promotes Fenton-like oxidation. The embodiments of the present application combine a microfluidic water sample digestion chip with various enhancement effects, and use a cross-digestion method with multiple reaction paths such as photocatalysis, photothermal catalysis, and photo-electric-assisted Fenton-like oxidation, thermal digestion, and magneto-induced microfluidic reaction digestion simultaneously or separately. The system is small in volume and convenient to carry, can shorten the digestion time, and improve the accuracy of detection.
Owner:WUHAN UNIV OF TECH
Dynamic characteristic and fatigue monitoring method and system for giant magnetostrictive bar
ActiveCN121254156AMaterial analysis using acoustic emission techniquesNuclear energy generationAcoustic emissionTransducer
The invention provides a giant magnetostrictive bar dynamic characteristic and fatigue monitoring method and system. According to the method, on the basis of multi-source parameters such as magnetostriction parameters, piezomagnetic parameters, magnetic conductivity parameters and acoustic emission characteristics generated by bars under the magnetic, force and heat multi-field coupling conditions, statistical characteristics are extracted in the initial steady-state stage, and quantitative indexes such as parameter deviation amplitude and change trend are adopted; and characterizing the performance change and fatigue evolution characteristics of the bar in the long-term excitation process. The system comprises a magnetic field loading module, a mechanical loading module, a thermal environment control module, a signal detection module and a signal processing module, and is used for providing a coupling magnetic field, prestress and a controllable temperature environment and realizing multi-parameter synchronous acquisition and processing. According to the method, through multi-physical quantity fusion and statistical characteristic analysis, continuous monitoring of the fatigue process of the giant magnetostrictive bar and real-time extraction of key parameters are achieved, and support is provided for material fatigue behavior research and reliability design of related transducers.
Owner:HUNAN UNIV
Ground stress relative change analysis method and system
ActiveCN119803735AForce measurement by measuring magnetic property varationForce/torque/work measurement apparatus calibration/testingClassical mechanicsMechanical engineering
The invention discloses a ground stress relative change analysis method and system. The method comprises the following steps: S1, acquiring piezomagnetic ground stress monitoring data; s2, obtaining additional stress through a least square method according to the piezomagnetic ground stress monitoring data; and S3, obtaining the current stress according to the change of the additional stress. By adopting the technical scheme of the invention, the relative change rule of the stress field can be effectively obtained, and the mutual relation between the regional stress field activity and the earthquake is disclosed.
Owner:INST OF GEOMECHANICS
Space magnetic field energy conversion device based on magnetoelectric material
PendingCN120750208APiezoelectric/electrostriction/magnetostriction machinesMechanical engineeringEnergy conversion efficiency
A space magnetic field energy conversion device based on magnetoelectric materials comprises an annular magnetism gathering fixing column with an opening, a simply supported beam is installed in the annular magnetism gathering fixing column and can deform to output voltage when a magnetic field changes, and the annular magnetism gathering fixing column is provided with a through opening in the width direction of the simply supported beam. The annular magnetism gathering fixing column can enhance the magnetic field intensity of the space where the simply supported beam is located, the surface of the simply supported beam is provided with a magnetic mass block, and the magnetic mass block can enhance the deformation of the simply supported beam so as to improve the output voltage. By using a piezomagnetic piezoelectric material of a simply supported beam structure, stress is dispersed at the two ends of the simply supported beam, stress distribution is more uniform, strain distribution of the whole simply supported beam is more uniform, energy conversion efficiency is better, the simply supported beam is installed in the hollow annular magnetism gathering fixing column, and the energy conversion efficiency is improved by utilizing the magnetism gathering function of the annular magnetism gathering fixing column. The dispersed magnetic field is gathered in the annular area, the magnetic field intensity around the simply supported beam is improved, and the magnetic field distribution is more uniform.
Owner:YUNNAN ELECTRIC POWER TESTING & RES INST (GRP) CO LTD
Multifunctional metamaterial beam-amplified low-frequency multiferroic mechanical antenna
The application discloses a multifunctional metamaterial beam amplified low-frequency multi-ferroelectric mechanical antenna, and relates to the technical field of antennas.The antenna is composed of a grid-shaped shuttle-shaped variable rigidity composite beam composed of a plurality of strong hysteresis magnetostrictive layers / high magnetic permeability magnetostrictive films / piezoelectric layer unit arrays, a first elastic substrate / soft piezoelectric material / second elastic substrate, a permanent magnet, an energy collection circuit and a negative resistance circuit.The elastic standing wave generated by exciting the piezoelectric array is enhanced through the variable rigidity characteristics of the elastic substrate in the composite beam and the strain convergence characteristics of the shuttle-shaped structure to enhance the magnetic moment oscillation effect of the permanent magnet at the end of the beam.The vibration of the permanent magnet and the magnetostriction effect of the magnetostrictive film jointly emit an alternating magnetic field.The planar grid structure and the vertical spiral structure of the metal elastic substrate form a low-frequency magnetic metamaterial through cascaded capacitance to amplify the emitted magnetic field;the soft piezoelectric material generates an alternating voltage when the composite beam vibrates, and the energy collection circuit supplies energy to the negative resistance circuit to further improve the Q value of the metamaterial and the magnetic field amplification effect.
Owner:SHANGHAI JIAOTONG UNIV
Functional gradient piezomagnetic piezoelectric material beam type sensor, sensor production device and production method
ActiveCN120702588ASubsonic/sonic/ultrasonic wave measurementUsing electrical meansStructural engineeringMechanical engineering
Owner:LANZHOU INST OF TECH
A method, device and system for measuring fan speed
ActiveCN115825471BWind energy generationDevices using electric/magnetic meansMagnetic effectTest efficiency
Embodiments of the present invention provide a fan speed measurement method, apparatus, and system. A piezomagnetic device made of flexible material and exhibiting a piezomagnetic effect is positioned in front of the fan's air outlet. The method comprises: obtaining elastic deformation data of the piezomagnetic device under wind force while the fan is operating; generating magnetic field intensity data corresponding to the elastic deformation data based on the piezomagnetic effect of the piezomagnetic device; converting the magnetic field intensity data into voltage data; and determining the fan's speed data based on the voltage data. Through the embodiments of the present invention, automated, real-time fan speed measurement is achieved, avoiding extensive repetitive work, improving the accuracy of test results, enhancing test efficiency, and avoiding testing methods that pose potential risks to the physical and mental health of test personnel.
Owner:INSPUR SUZHOU INTELLIGENT TECH CO LTD
Magic cube magnetic bin piezomagnetic machine
ActiveCN222536851USimple structurereasonable designAssembly machinesMetal working apparatusElectric machineryMachine
The utility model provides a magic cube magnetic bin piezomagnetic machine which comprises a machine frame, a rotary table mechanism is installed on the machine frame, the rotary table mechanism comprises a rotary table body, and a plurality of magnetic bin clamps which are distributed in a circumferential array mode with the circle center of the rotary table body as the center are installed on the rotary table body. Each magnetic bin clamp is provided with a plurality of magnetic bin fixing grooves, and the rotating disc driving motor is installed at the bottom of the rotating disc body and connected with the rotating disc body. A magnetic bin feeding mechanism, a magnet pre-pressing mechanism, a magnet pressing mechanism, a magnet detecting mechanism, a finished product discharging mechanism and a defective product discharging mechanism are sequentially installed on the portion, located on the periphery of the rotating disc body, of the rack in the rotating direction of the rotating disc body. The magnetic pressing machine for the magnetic bin of the magic cube is simple in structure, reasonable in design, high in automation degree, capable of achieving automatic feeding, magnetic pressing, detecting and discharging of the magnetic bin, high in assembly efficiency and good in quality.
Owner:GAN CUBE INC
Full-automatic magic cube magnetic bar piezomagnetic machine
The utility model provides a full-automatic magic cube magnetic bar magnetic pressing machine which comprises a machine frame, a magnetic bar clamp rotating disc mechanism is installed on the machine frame, the magnetic bar clamp rotating disc mechanism comprises a rotating disc installation support, the rotating disc installation support is fixed to the machine frame, and a rotating disc is installed on the rotating disc installation support in the vertical direction. A plurality of magnetic bar clamps distributed in a circumferential array mode with the circle center of the rotary disc as the center are installed on the end edge of the rotary disc, and the rotary disc driving motor is installed on the back side of the rotary disc installation support and connected with the rotary disc. A magnetic bar feeding mechanism, a magnetic bar notch positioning mechanism, a magnetic bar notch detecting mechanism, a piezomagnetic mechanism, a magnet detecting mechanism, a finished product discharging mechanism and a defective product discharging mechanism are sequentially installed on one side, provided with the magnetic bar clamp, of the machine frame in the rotating direction of a rotating disc. The full-automatic magic cube magnetic bar piezomagnetic machine is reasonable in design, high in automation degree, capable of achieving automatic feeding, positioning, piezomagnetic, detecting and discharging of magnetic bars, high in assembly efficiency and good in quality.
Owner:GAN CUBE INC
Functionally graded piezoelectric beam sensor, sensor manufacturing apparatus and manufacturing method
ActiveCN120702588BSubsonic/sonic/ultrasonic wave measurementUsing electrical meansData connectionStructural engineering
This invention discloses a functionally graded piezoelectric beam sensor, a sensor manufacturing apparatus, and a manufacturing method, belonging to the field of sensors. The functionally graded piezoelectric beam sensor includes a piezoelectric vibration sensor and a piezoelectric vibration sensor. The piezoelectric vibration sensor is connected to a beam frame, and there are multiple piezoelectric vibration sensors distributed on the upper and side surfaces of the beam frame. The beam frame is clamped to a foundation, and the foundation has pre-set grooves corresponding to the beam frame. A transverse stabilizing cylinder and a vertical stabilizing cylinder are slidably mounted on the beam frame. Multiple sets of piezoelectric vibration sensors on the beam frame can perform synchronous measurements at different positions and directions, measuring multiple vibration data. A connecting column is inserted into the bottom wall of the inner groove of the convex groove. At this time, the piezoelectric vibration sensor is not in contact with the beam frame but is directly plugged into the foundation 3 for further detection in multiple directions.
Owner:LANZHOU INST OF TECH
Rotary structure and electronic device
The embodiment of the utility model discloses a rotating structure and electronic equipment. Wherein the rotating structure comprises a frame, a cam shaft, a piezomagnetic assembly and a magnet, the cam shaft is provided with an arc-shaped surface with curvature changes and is movably connected with the frame, and the piezomagnetic assembly and the magnet are arranged in the frame. When the rotating structure works, the magnet is adopted to form a magnetic field, the piezomagnetic assembly is extruded through the arc-shaped surface with the curvature change, and the extruded piezomagnetic assembly deforms and further changes the state of the magnetic field. The rotating state of the cam shaft is reflected through the magnetic field change, the piezomagnetic assembly is arranged to achieve the change of the magnetic field state, the overall structure is simplified, occupied space is reduced, the magnetic field is slightly influenced by the outside, and good stability and accuracy are achieved.
Owner:LUXSHARE ITECH(ZHEJIANG) CO LTD
A very low frequency magnetoelectric antenna array with multi-field driven positive feedback
ActiveCN119315254BAntenna arraysSimultaneous aerial operationsMagnetic field couplingEmission efficiency
A multi-field-driven positive feedback very low frequency magnetoelectric antenna array. The magnetoelectric antenna is composed of multiple strong hysteresis voltage magnetic layer / anisotropic high magnetic permeability piezomagnetic thin film / piezoelectric layer unit arrays, a grid-shaped substrate, and a magnetically shielded permanent magnet unit. On the one hand, the elastic standing wave generated by the piezoelectric array in the elastic substrate and the magnetic field convergence effect of the anisotropic high magnetic permeability piezomagnetic thin strip are used to realize the strong elastic field / magnetic field coupling characteristics between array units and drive the magnetic moment oscillation of the piezomagnetic thin strip, achieving the non-linear growth of the emission field strength with the number of units, overcoming the defects of single magnetoelectric antennas and weak magnetic moment energy regulation by a single elastic field, and significantly improving the magnetic field emission efficiency. On the other hand, the positive feedback magnetic field excitation mechanism between the magnetoelectric emission antenna and the magnetically shielded permanent magnet is used to break through the bottleneck of the restriction of the high quality factor on the bandwidth of the magnetoelectric antenna, realizing the functions of wide bandwidth and high emission efficiency.
Owner:SHANGHAI JIAOTONG UNIV
No-heat, no-burn smoking article
An aerosol delivery device is provided that includes at least one housing, a nozzle, a piezoelectric or piezomagnetic material, a control component, and a transport element. The at least one housing may enclose a reservoir configured to retain an aerosol precursor composition. The nozzle may be coupled to the housing to discharge aerosol precursor composition from the reservoir. The control component may include a microprocessor coupled to and configured to drive the piezoelectric or piezomagnetic material to vibrate and cause a discharge of components of the aerosol precursor composition and thereby produce an aerosol for inhalation by a user. And the transport element may be configured to control an amount of aerosol precursor composition delivered from the reservoir.
Owner:RAI STRATEGIC HOLDINGS INC
Dynamic Characteristics and Fatigue Monitoring Methods and Systems for Giant Magnetostrictive Rods
ActiveCN121254156BMaterial analysis using acoustic emission techniquesNuclear energy generationAcoustic emissionTransducer
This invention provides a method and system for monitoring the dynamic characteristics and fatigue of giant magnetostrictive rods. The method utilizes multiple parameters generated by the rod under magnetic, mechanical, and thermal multi-field coupling conditions, including magnetostrictive parameters, piezomagnetic parameters, permeability parameters, and acoustic emission characteristics. By extracting statistical features in the initial steady-state stage and employing quantitative indicators such as parameter deviation amplitude and trend, the performance changes and fatigue evolution characteristics of the rod during long-term excitation are characterized. The system includes a magnetic field loading module, a mechanical loading module, a thermal environment control module, a signal detection module, and a signal processing module. These modules provide a coupled magnetic field, prestress, and a controllable temperature environment, and enable simultaneous acquisition and processing of multiple parameters. Through multi-physical quantity fusion and statistical feature analysis, this invention achieves continuous monitoring of the fatigue process of giant magnetostrictive rods and real-time extraction of key parameters, providing support for research on material fatigue behavior and the reliable design of related transducers.
Owner:HUNAN UNIV
Method for improving piezomagnetic coefficient of iron-based amorphous alloy based on pulse laser technology
ActiveCN119634997AImprove plasticityHigh magnetostrictive performanceConverting sensor output electrically/magneticallyLaser beam welding apparatusLaser technologyPulsed laser beam
The invention discloses a method for improving a piezomagnetic coefficient of an iron-based amorphous alloy based on a pulse laser technology, and belongs to the technical field of pulse laser. According to the method, linear laser nicks which are arranged in parallel are etched on the surface of the iron-based amorphous alloy by utilizing a pulse laser beam, so that the piezomagnetic coefficient of the iron-based amorphous alloy is improved; the distance between the pulse laser nicks ranges from 15 mm to 30 mm, and the width of the pulse laser nicks ranges from 5 mm to 20 mm. According to the method, after the surface of the iron-based amorphous alloy is machined by adjusting the laser power and the width and the distance of the periodic linear laser nicks, the saturation magnetostriction coefficient and the maximum piezomagnetic coefficient are remarkably improved, and the material still keeps the amorphous structure characteristic and has excellent plasticity.
Owner:NANJING NORMAL UNIVERSITY
Radio frequency MEMS magnetoelectric antenna chip analysis method based on electromagnetic-force-micro magnetic coupling
ActiveCN120524763ADesign optimisation/simulationConstraint-based CADHeterojunctionRadio frequency microelectromechanical system
The invention provides a radio frequency MEMS magnetoelectric antenna chip analysis method based on electromagnetic-force-micro magnetic coupling. Relates to the field of radio frequency MEMS, the analysis technology relates to multi-physics field simulation, based on the existing static-force-static magnetic coupling MEMS magnetoelectric antenna simulation technology, the micro-magnetic ferromagnetic resonance theory and the full-dynamic Maxwell equation are creatively introduced, and the near-field radiation characteristics of the novel heterostructure radio frequency MEMS magnetoelectric antenna can be directly simulated and analyzed through the technical method. The method comprises the following steps: establishing a three-dimensional geometric model of the MEMS magnetoelectric antenna chip, carrying out geometric and material parameter setting on the three-dimensional geometric model, setting boundary conditions of the three-dimensional geometric model, carrying out mesh generation, introducing a micro-magnetic module on the basis of coupling of a traditional piezoelectric module and a piezomagnetic module, and carrying out micro-magnetic modeling on the micro-magnetic module. Therefore, an electromagnetic-force-micro-magnetic coupling equation is constructed, and the electromagnetic-force-micro-magnetic coupling equation comprises a Maxwell equation for describing electromagnetic waves, a Newtonian mechanics motion equation for describing acoustic effects and an LLG equation for describing magnetization dynamics.
Owner:ANHUI UNIV +1