169 results about "Magnetostriction" patented technology

The invention discloses a transformer abnormity identification method based on voiceprint feature analysis, and belongs to the field of power equipment state monitoring and intelligent diagnosis. The method comprises the following steps: firstly, analyzing an iron core acoustic mechanism based on a magnetostrictive effect, and establishing a three-dimensional model through finite element simulation to obtain vibration and sound field characteristics; in a complex substation environment, a hybrid noise reduction method combining density peak clustering and a CEEMDAN-wavelet threshold is provided, and the signal-to-noise ratio is effectively improved. Then extracting Mel-frequency cepstrum coefficients (MFCC) and spectrum features, and performing local linear embedding (LLE) dimension reduction to form a compact feature set; in the recognition stage, a convolutional neural network framework is designed, specifically, a spectrogram and an energy spectrum are modeled through a two-dimensional CNN, an MFCC tensor obtained after dimensionality reduction is modeled through a three-dimensional CNN, and accurate diagnosis of mechanical faults such as core looseness is achieved. The method has the advantages of being non-contact, anti-noise and high in recognition precision, and real-time diagnosis and early warning of mechanical abnormity of the transformer can be achieved under complex working conditions.

An acoustically driven ferromagnetic resonance (ADFMR) device has a piezoelectric element comprised of piezoelectric material, first and second electrodes arranged in a vertical stack with the piezoelectric element to activate the piezoelectric element to generate an acoustic wave, a radio frequency voltage source electrically connected to the first electrode, a magnet comprised of a magnetostrictive material to receive the acoustic wave, the magnet being in the vertical stack with the first and second electrodes and the piezoelectric element, wherein the acoustic wave resonates at a ferromagnetic resonance of the magnetostrictive material, and a readout circuit to detect a change in the acoustic wave by detecting g one of an output voltage amplitude, a change in impedance or a reflection of the acoustic wave in the magnet to measure an unknown magnetic field in which the ADFMR device resides and as experienced at the magnetostrictive element.

The invention provides an aircraft detection method and system based on eddy current induced optical fiber micro-vibration, and relates to the technical field of aircraft detection.The aircraft detection method comprises the steps that alternating magnetic field data of aircraft eddy current is collected, and time and frequency dimension change features are analyzed and extracted to serve as a magnetic field feature benchmark; the magnetostrictive sensing rod of the magnetoelectric sensing unit is combined with the fiber bragg grating, and magnetic field change generated by the eddy current magnetic field effect of the aircraft is converted into a voltage signal. And decomposing the time-frequency characteristics of the voltage signals according to the magnetic field characteristic reference, generating electric signal components of different frequency band magnetic field energy evolved along with time, screening characteristic magnetic field change components, and matching the characteristic magnetic field change components with a standard magnetic field mode in a preset database to identify types. Motion characteristic parameters are selected according to identification types, motion states are analyzed and flight trajectories are predicted in combination with time sequence characteristics, graded early warning signals are generated according to the position relation between the trajectories and preset safety areas, and detection and safety early warning of the aircraft can be achieved.

The invention discloses an oil cylinder sealing optimization system based on electromagnetic induction regulation and control, and the system comprises an electromagnetic induction unit, a coil of which generates an alternating magnetic field in a sealing area, and acts on a magnetic sensitive composite material sealing element; the sensor unit monitors the leakage rate, the temperature and the pressure in real time; the control unit executes a self-adaptive PID control algorithm, dynamically adjusts PID parameters according to sensor data, and outputs a PWM signal to control the electromagnetic induction unit so as to optimize the sealing performance in real time; the controllable alternating magnetic field is applied to the magnetic-sensitive sealing element through the electromagnetic induction unit, the elastic modulus and the contact pressure of the magnetic-sensitive sealing element are regulated in real time through the magnetocaloric or magnetostrictive effect, meanwhile, key parameters such as leakage, temperature and pressure are monitored in real time in combination with a sensor, and the sealing state is rapidly responded and dynamically adjusted through a self-adaptive PID algorithm in the control unit. Oil cylinder sealing can be self-optimized according to working condition changes, and the problem that traditional static sealing cannot adapt to dynamic working conditions is solved.

To easily and securely manufacture a magnetostrictive member with increased parallel magnetostriction and reduced variation in parallel magnetostriction between members.SOLUTION: A manufacturing method for a magnetostrictive member is for manufacturing a magnetostrictive member composed of a crystal of an iron-based alloy having magnetostrictive properties and having a shape having a longitudinal direction and a shortitudinal direction. The manufacturing method for a magnetostrictive member includes measuring the parallel and perpendicular magnetostrictive quantities on one surface of the crystal, and cutting the crystal such that the direction in which the measured parallel and perpendicular magnetostrictive quantities become larger is the longitudinal direction of the magnetostrictive member.SELECTED DRAWING: Figure 1

This invention relates to an Fe-Ni based alloy with enhanced soft magnetic properties utilizing a medium-range ordered structure and its preparation method. The chemical formula of the alloy is: Fe bal Ni a Cr y Si b B c M d Cu e X f Its microstructure is as follows: the alloy matrix is ​​mainly amorphous, with dispersed atomic-scale medium-range ordered (MRO) clusters comprising 15%–40% by volume. The size of these clusters is controlled between 1 nm and 5 nm, and no long-range crystalline phases larger than 10 nm are formed. By introducing Ni element to couple magnetic moments with Fe to reduce the saturation magnetostriction coefficient, and by using a low-temperature relaxation annealing process to control the pre-precipitation behavior of Cu element, a high-density MRO-reinforced framework is established in the amorphous matrix. This material possesses high saturation magnetic induction, low coercivity, and excellent high-frequency permeability, which can improve the problems of large magnetostriction coefficients and high high-frequency noise in existing high-Bs iron-based nanocrystalline alloys. It is particularly suitable for high-frequency high-power transformers and wireless charging magnetic shielding modules.

The invention provides a sensing system integrating torque detection and angle detection, and the system comprises a strain body which is used for generating deformation when bearing a torque; the strain gauge is fixed on the strain body, the strain gauge is made of an inverse magnetostrictive material, the magnetic conductivity of the strain gauge changes along with the strain borne by the strain gauge, and the strain gauge is provided with a preset patterned structure; the angle coding structure is arranged on the strain body; the circuit board is provided with at least one planar coil and an angle sensing assembly; wherein the planar coil corresponds to the patterned structure in space and is used for detecting the magnetic conductivity change of the strain gauge so as to obtain torque information; the angle sensing assembly corresponds to the angle coding structure in space and is used for acquiring angle information of the strain body.

The application provides an active damping method and system for a reactor based on a magnetostrictive effect positive compensation, and belongs to the technical field of damping of power equipment; the method comprises the following steps: determining optimal compensation compression stress through analysis of a vibration source characteristic and mapping of a material characteristic; adopting a preset core compression structure, applying the optimal compensation compression stress in a core manufacturing and assembling stage, and maintaining the optimal compensation compression stress through a pre-tightening element; and performing vibration testing on the reactor after the optimal compensation compression stress is applied, and iteratively fine-tuning until a vibration suppression rate meets a preset target. The application can actively utilize and reshape the compensation mechanism of the magnetostrictive effect, so that the deformation generated by the magnetostrictive effect and the deformation of the electromagnetic force are offset, and the overall vibration of the reactor is greatly reduced from the source.

Magnetostrictive displacement sensor, characterized in that it comprises a measuring head (1) and a measuring rod (2) which are connected to each other, and a slider (3) which is arranged on the measuring rod (2) and can move along the longitudinal direction of the measuring rod (2);wherein the measuring head (1) comprises a housing (11), a sensitive element assembly (12), a signal processing element (13), a pulse element (14) and an end cap assembly (15), wherein the end cap assembly (15) is detachably arranged on one side of the housing (11) facing away from the measuring rod (2), wherein the end cap assembly (15) and the housing (11) together form a receiving cavity (11a), wherein the sensitive element assembly (12), the signal processing element (13) and the pulse element (14) are all arranged in the receiving cavity (11a), wherein the sensitive element assembly (12) is electrically connected to the signal processing element (13) and the pulse element (14), wherein a waveguide wire (127) is arranged inside the measuring rod (2), wherein one end of the waveguide wire (127) is connected to the sensitive element assembly (12) is connected;wherein the magnetostrictive displacement sensor (100) further comprises a holder (16) comprising a first surrounding plate (161) and a second surrounding plate (162), one of the first surrounding plate (161) and the second surrounding plate (162) being provided with an insertion part, while the other being provided with a fitting part, the insertion part snapping into the fitting part, the first surrounding plate (161) and the second surrounding plate (162) enclosing a limiting groove, with at least a portion of the structure of the sensitive element assembly (12) being limited in the limiting groove, and wherein the signal processing element (13) and the pulse element (14) are each arranged on two opposite sides of the sensitive element assembly (12), and wherein the signal processing element (13) and the pulse element (14) are each in buffered contact with the inner side wall of the housing.

The invention discloses a soot blowing pipeline wall thickness online monitoring method based on temperature self-adaption, and relates to the technical field of industrial pipeline nondestructive testing. The problems that in the prior art, a detection signal is unstable in a high-temperature environment, and the micro corrosion thinning recognition precision is insufficient can be at least partially solved. The method comprises the steps that the surface temperature of a pipeline is collected, and the force contribution ratio of Lorentz force to magnetostriction force is calculated; dynamically optimizing electromagnetic ultrasonic body wave excitation parameters according to the force contribution ratio; body waves are excited point by point in the axial direction of the pipeline, and echo signals are collected; extracting bottom wave features by using empirical mode decomposition and wavelet threshold combined noise reduction; calculating the wall thickness of each measuring point based on the temperature correction sound velocity; and generating a B-scan image and carrying out grading evaluation according to the percentage of the thinning amount. According to the method, the wall thickness is accurately measured under the high-temperature working condition, signal stability is ensured through temperature self-adaptive parameter optimization, the signal-to-noise ratio is remarkably improved through combined noise reduction, wall thickness distribution is visually presented through B scanning imaging, and reliable data support is provided for safe operation and maintenance of a pipeline.

The invention belongs to the field of sound transmission equipment, and particularly relates to bone conduction sound transmission equipment based on a magnetostrictive element, which comprises a shell, an accommodating cavity is formed in the top of the shell, and an element mounting groove is formed in the bottom surface of the accommodating cavity; a magnetostrictive element is arranged in the element mounting groove, the upper end and the lower end of the magnetostrictive element are connected with a first permanent magnet and a second permanent magnet respectively, and the outer side of the magnetostrictive element is sleeved with a hollow coil; a sound transmission rod is arranged above the first permanent magnet, and a noise reduction reset assembly used for resetting the sound transmission rod is arranged at an opening of the containing cavity. According to the design, the hollow coil is fixed in the mode that the element installation groove is matched with the coil limiting ring, an additional coil support is not needed, and therefore the overall weight of the device is reduced, the device can adapt to the high-frequency mechanical vibration requirement of bone conduction, the noise reduction reset assembly is arranged, vibration noise generated by the magnetostriction element is effectively blocked, and the service life of the device is prolonged. Noise transmission in the containing cavity is reduced, and the sound transmission quality effect is guaranteed.

The invention relates to an oil-immersed transformer which is characterized in that a vibrating reed made of magnetostrictive materials is mounted on the inner wall of an oil tank, leakage magnetic field energy generated by a winding and an iron core during operation of the transformer is converted into high-frequency micro-vibration mechanical energy of the vibrating reed, and the vibration energy is rigidly transmitted to an external radiating fin through the wall of the oil tank; and a transformer oil boundary layer on the surface of the cooling fin is damaged, so that self-adaptive heat dissipation enhancement with zero external driving, zero additional energy consumption and no maintenance is realized.

Apparatus for near-field wireless energy transfer. A first layer provides or comprises a piezoelectric phase or a material with or adapted for electromechanical coupling; and a second layer provides or comprises a magnetostrictive phase or a material with or adapted for a magnetomechanical coupling. The second layer is mechanically and / or chemically coupled to the first layer to provide a composite structure.

The utility model relates to the field of magnetostrictive piezometric tubes, and particularly discloses a magnetostrictive piezometric tube water level measuring device which comprises a measuring device, the measuring device comprises a liquid level meter and a waveguide wire, a positioning mechanism is arranged below the liquid level meter and comprises two positioning chucks, a locking screw is installed on the side surface of the left positioning chuck, and a locking nut is installed on the side surface of the right positioning chuck. And a penetrating hole is formed in the position, corresponding to the locking screw, in the positioning chuck located on the right side, limiting sliding grooves are formed in the lower surfaces of the two positioning chucks, limiting clamping plates are installed in the limiting sliding grooves, and springs are installed at the positions, located in the limiting sliding grooves, of one sides of the limiting clamping plates. The two positioning chucks are integrally in butt joint at the tank opening position of a detection position, and the two limiting clamping plates are clamped on the outer side of a pipeline under the reset acting force of the spring, so that it can be guaranteed that a measuring device installed in the positioning mechanism is installed at the center position, and it can be guaranteed that a waveguide wire is straightened under the action of a guide cable balancing weight below the positioning mechanism.

The utility model discloses a magnetically controlled reactor which comprises a first installation support, the upper surface of the first installation support is connected with a group of iron core yoke frames, the outer surface of each iron core yoke frame is sleeved with a coil, and the two ends of each coil are electrically connected with electrode plates. According to the device, through the arrangement of the first mounting bracket, the second mounting bracket, the iron core yoke frame, the coil, the electrode plate, the sound insulation cover and the sound absorption plate, noise generated by a magnetostriction phenomenon can be uniformly absorbed by utilizing the sound absorption plate made of a polyester fiber material, and the noise is blocked by utilizing the sound insulation shell, so that noise reduction protection of the magnetically controlled reactor is realized, and the service life of the magnetically controlled reactor is prolonged. According to the magnetically controlled reactor, the problem that noise generated during work of the magnetically controlled reactor causes interference to the environment is solved, the heat dissipation assembly, the heat dissipation fan, the dust cover and the heat dissipation air holes are arranged, the heat dissipation fan can be used for blowing air into the sound insulation shell and discharging heat, air blowing cooling of the magnetically controlled reactor is achieved, and the magnetically controlled reactor can be safely and effectively used conveniently.

The application relates to the technical field of magnetic field monitoring, in particular to a single-point multi-azimuth magnetostrictive magnetic field change dynamic prediction device and a use method thereof, which comprises a probe, a probe rod connected with the probe, a magnetostrictive part arranged in the probe rod, a force receiving part arranged in the probe, one end of the magnetostrictive part penetrating into the probe and connected with the force receiving part, and a piezoelectric part arranged in the probe, wherein the piezoelectric part is provided with two groups along the thickness direction of the force receiving part, and the two groups of piezoelectric parts are arranged on the two sides of the force receiving part along the thickness direction of the force receiving part. The application utilizes the principle that the magnetostrictive part will be elongated or shortened when affected by a magnetic field to monitor the magnetic field intensity and direction, and the monitoring precision is relatively high; in addition, the magnetostrictive part is less affected by temperature, is suitable for measurement in relatively harsh environments such as high temperature, and has relatively strong anti-interference capability.

The invention discloses a Terfenol-D magnetostrictive material-based optical force magnetometer magnetic measurement method, which comprises the following steps of: firstly, densely winding a single-mode optical fiber on the surface of a Terfenol-D magnetostrictive element in multiple circles, so that the magnetostrictive deformation of the Terfenol-D magnetostrictive element under the action of an external magnetic field is transmitted to the single-mode optical fiber; an unequal-arm Mach-Zehnder interferometer is constructed; the method comprises the following steps: applying magnetic fields under magnetic fields with different intensities, measuring change values of interference phases under the magnetic fields with different intensities according to a magnetostrictive strain relationship of a Terfenol-D magnetostrictive element, and establishing a calibration curve between the change values of the interference phases and the external magnetic field intensity; when a magnetic field to be measured acts on the sensing arm, the corresponding external magnetic field intensity is calculated according to the calibration curve. The magnetic measurement method is simple in structure, all signals are transmitted through an optical path, and electromagnetic interference can be effectively resisted; the measuring process is quick in response, and is suitable for quickly changing magnetic field measurement.

The application relates to the technical field of bolt pre-tightening force measurement, in particular to a bolt pre-tightening force self-sensing real-time monitoring method based on magnetostrictive effect, which comprises the following steps: the monitoring method is used for a data processing unit in a bolt pre-tightening force self-sensing real-time monitoring system based on magnetostrictive effect; the monitoring system further comprises a bolt, an energy collecting unit, an excitation unit and an impedance measuring unit; the monitoring method comprises the following steps: receiving impedance data sent by an impedance sensor in the impedance measuring unit; the impedance data is data obtained by the impedance sensor in the impedance measuring unit when the impedance sensor measures the impedance of a measuring coil under the action of an excitation signal; the excitation signal is output by the excitation unit to the measuring coil; inputting the impedance data into a first calculation model in the data processing unit to obtain a first bolt pre-tightening force at a first target time when the impedance data is collected.

The invention discloses a flexible photonic crystal fiber magnetic field sensor, a preparation method and a detection system, and relates to the technical field of optical fiber sensing. The flexible photonic crystal fiber magnetic field sensor comprises a flexible photonic crystal fiber, a first transmission fiber and a second transmission fiber; the first transmission optical fiber and the second transmission optical fiber are coaxially inserted and fixed in the flexible photonic crystal optical fiber from the two ends respectively; the flexible photonic crystal fiber comprises a polymer substrate and magnetostrictive material microspheres, the magnetostrictive material microspheres are uniformly dispersed in the polymer substrate, and the magnetostrictive material microspheres are periodically arranged in the polymer substrate; wherein the magnetostrictive material microspheres can be subjected to volume expansion under the action of a magnetic field, and the arrangement period of the magnetostrictive material microspheres in the polymer substrate is changed. The flexible photonic crystal fiber magnetic field sensor can be prepared at low cost and high efficiency, and the industrialization process of the photonic crystal fiber magnetic field sensor can be promoted.

The invention relates to a low-frequency transmitting-receiving magnetoelectric coupling integrated antenna and a preparation method thereof. The low-frequency transmitting-receiving magnetoelectric coupling integrated antenna comprises a transmitting antenna unit and a receiving antenna unit, the transmitting antenna unit comprises an L-T type magnetoelectric composite material structure, the L-T type magnetoelectric composite material structure is formed by compounding at least one piezoelectric material layer and at least two magnetostriction material layers symmetrically arranged on the two sides of the piezoelectric material layer through a bonding layer, and the magnetization direction of magnetostriction materials is in the length direction of the composite material structure. The polarization direction of the piezoelectric material is along the thickness direction of the composite material structure; the receiving antenna unit comprises an MLT type magnetoelectric composite material structure, the MLT type magnetoelectric composite material structure comprises a plurality of piezoelectric material sheets which are in electrode series connection in a plane and at least one magnetostriction material layer which is compounded on at least one main surface of the piezoelectric material sheets which are in series connection through a bonding layer, and a permanent magnet which is used for providing a direct current bias magnetic field is arranged on the MLT type structure. According to the low-frequency transmitting-receiving magnetoelectric coupling integrated antenna, the effective working frequency is reduced to the target VLF frequency band through the L-T and MLT structures.

Provided is a grain-oriented magnetic steel sheet having both low iron loss and low magnetostriction. The grain-oriented magnetic steel sheet has a heat-strained region extending in a direction transverse to a rolling direction, and has closed magnetic domains in the heat-strained region. The heat-strained region has maximum points of tensile strain on both sides of the closed magnetic domains in the rolling direction. In a strain distribution in the rolling direction of the heat-strained region, the strain on both sides of the closed magnetic domains is a tensile strain greater than the strain at the center between the maximum points.

The application discloses an electromagnetic ultrasonic transducer, a monitoring system and a method for in-situ detection of high-temperature welds, comprising an adjustable magnetic circuit mechanism and a multi-channel coil assembly; the adjustable magnetic circuit mechanism can flexibly adjust the distance between the magnetic field generating part and the surface coating of the high-temperature weld of the detected object to adapt to the optimal working magnetic field of the coating; the multi-channel coil assembly comprises at least two independent coils insulated from each other, each independent coil constitutes an independent detection channel, and the size of the independent coil is matched with the size of the bottom surface of the magnetic field generating part to realize local concentrated detection. The application can solve the technical problems that the existing electromagnetic ultrasonic transducer is limited in transduction efficiency due to the mismatch between the magnetic field strength and the optimal working magnetic field required by the magnetostrictive coating, and the sensitivity of micro defect detection is insufficient due to the excessively large sound field action area of the single coil structure, improves the stability and reliability of the transducer in a high-temperature environment, and realizes efficient and accurate in-situ detection of high-temperature welds.

The application discloses a float structure of a magnetostrictive liquid level meter for a urea tower, and has the technical scheme that the hollow structure is integrally processed and formed with an inner tube, a magnet for liquid level measurement is arranged, and the middle section of the inner tube is a linear section protruding inward, and the upper and lower sections are inclined surface sections obliquely outward. The application has the advantages that the structure is simple, the manufacture is easy, the cost is low, liquid transverse fluctuation against great impact force can be effectively resisted, the measurement precision, reliability and stability are improved, and long-term stable operation can be realized in a high-temperature, high-pressure and corrosive environment.

This invention discloses a magnetically tuned thin-film bulk acoustic resonator (FBAR), its fabrication method, and its applications. The FBAR comprises a first electrode, a piezoelectric material layer, and a second electrode stacked sequentially. The second electrode comprises at least one alternating layer of a first material layer and at least one layer of a second material layer, wherein the at least one first material layer is a magnetostrictive thin film, and the magnetostrictive thin film and the piezoelectric material layer cooperate to form a magnetoelectric heterojunction. This invention provides a magnetically tuned thin-film bulk acoustic resonator that uses a magnetically stretched composite thin film as the upper electrode. Utilizing the magnetoelectric effect of the magnetic and piezoelectric materials, the resonant frequency of the FBAR can be adjusted in the low-frequency, mid-frequency, and even high-frequency range under the influence of a magnetic field.

The invention relates to non-oriented high silicon steel and a preparation method and application thereof, and belongs to the technical field of alloys. The non-oriented high silicon steel comprises the following chemical components in percentage by weight: 5.0 to 6.0 percent of Si, less than or equal to 0.005 percent of C, 0.10 to 0.25 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.005 percent of S, 0.3 to 1.2 percent of Ti and the balance of Fe and inevitable impurities. The non-oriented high silicon steel has the advantages of low magnetostriction rate, high strength and high plasticity.

The invention belongs to the technical field of aero-engines, and particularly relates to a film disc coupler compensation amount monitoring device which comprises a support made of a non-magnetic material and fixed to the ground or a rotor supporting foundation; the first magnetic ring and the second magnetic ring are fixedly installed on flanges at the two ends of the membrane disc coupler respectively and used for generating an induced magnetic field; the magnetostriction sensors are installed on the support, at least three magnetostriction sensors used for measuring the distance between the magnetostriction sensors and a first magnetic ring are installed on the axial side of the first magnetic ring of the membrane disc coupler, and magnetostriction sensors which are the same as the first magnetic ring end in angular position and number and used for measuring the distance between the magnetostriction sensors and a second magnetic ring are installed at the other end of the membrane disc coupler. The temperature sensor is arranged at the position, close to the magnetostrictive sensor, of the support and used for measuring the temperature of the support; the line concentration box or the transmitter is used for receiving a sensor signal; and the data processing and display unit is used for calculating the axial compensation amount and the angular compensation amount of the diaphragm coupling through a mathematical model.

The present application relates to a kind of alternating magnetization magnetostrictive flexible probe, detection device and detection method, wherein, flexible probe includes spiral magnetizing coil and meander coil, the spiral magnetizing coil is set to the part to be measured, the spiral magnetizing coil is configured to produce alternating magnetic field by loading alternating current;The meander coil is set at the position between the spiral magnetizing coil and the part to be measured, the meander coil is configured to produce dynamic magnetic field by loading pulse string current, wherein, the flexible probe produces magnetostrictive vibration based on the alternating magnetic field and dynamic magnetic field, and excites out ultrasonic signal;Using spiral magnetizing coil instead of traditional permanent magnet to produce alternating magnetic field, spiral magnetizing coil and meander coil can be flexibly bent, so as to effectively fit the surface of the part to be measured, especially suitable for the curved surface detection of the part to be measured, effectively reduce the volume of probe while realizing flexible detection.