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15 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
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
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 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
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
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
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
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
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