501 results about "Magnetostriction" patented technology

The present application provides a method for pipeline defect detection using the magnetostrictive characteristics of ultrasonic guided waves, which relates to the technical field of pipeline defect detection, including: obtaining the geometric and material parameters of multi-layer heterogeneous pipelines, and establishing a mathematical model of the pipeline; according to the mathematical model, calculating the dispersion curve and modal characteristics of ultrasonic guided waves in the pipeline; selecting a suitable excitation frequency and guided wave mode, and optimizing the detection parameters of ultrasonic guided waves; presetting defects of different types and sizes in the pipeline, and analyzing the influence of defects on guided wave propagation characteristics through numerical simulation; building a multi-layer heterogeneous pipeline ultrasonic guided wave detection experimental system, collecting guided wave signals under different defect conditions, and extracting time-frequency domain characteristic parameters. The present invention can realize the effective detection and evaluation of internal defects of multi-layer heterogeneous pipelines at different temperatures, and provides an important technical means for ensuring the safe operation of pipelines.

The invention relates to the technical field of magnetic bias monitoring, in particular to a real-time monitoring method and system for direct-current magnetic bias of a transformer. The method comprises the following steps: acquiring a primary side current signal and an iron core vibration signal of the transformer; analyzing the zero-flux closed-loop characteristic of the primary side current signal of the transformer and performing temperature drift elimination on the primary side current signal of the transformer to generate a primary side optimization signal of the transformer; performing magnetostrictive vibration noise separation on the iron core vibration signal to generate an iron core vibration separation signal; dynamically filtering a power frequency fundamental wave of the primary side optimization signal of the transformer to extract a pure direct current component; and performing wavelet packet decomposition on the iron core vibration separation signal, and performing magnetostriction characteristic spectrum extraction on the decomposed iron core vibration separation signal to obtain an iron core magnetostriction characteristic spectrum. According to the invention, through multi-source signal fusion and material characteristic modeling, the accuracy, real-time performance and graded protection response capability of transformer DC magnetic bias monitoring are improved.

The invention provides a magnetostriction-based multi-physical-field defect detection method and system for pressure-bearing equipment, and relates to the technical field of detection, and the method comprises the steps: constructing a reconfigurable magnetic field excitation array and a multi-physical-quantity sensing network through an intelligent excitation and sensing device, and dynamically adjusting the excitation phase to improve the detection precision. According to the layered coupling calculation scheme, a coupling relationship among a magnetic field, a stress field and a temperature field is established, and multi-physical field data calculation is carried out in combination with physical constraint conditions. After multi-level wavelet packet decomposition and noise reduction, the deep neural network is utilized to extract features and generate a defect feature dictionary, so that efficient defect positioning and size evaluation are realized, and the accuracy and reliability of detection are remarkably improved.

The invention relates to the technical field of sensors, in particular to a transformer dynamic magnetic bias current detection method and device based on magnetoelectric coupling sensing, and the detection device composed of a magnetoelectric coupling sensing element, an exciting coil and a rear-end processing circuit is used for measuring direct current magnetic bias current. The working principle of the magnetoelectric coupling sensing element is based on stress coupling between the magnetostrictive material and the piezoelectric material, then an output signal is generated on the piezoelectric material, and the sensitivity is remarkably improved by using the resonance amplification effect of the magnetoelectric coupling sensing element. Non-contact current detection can be realized by detecting the magnetic field generated by the magnetic bias current of the neutral point grounding wire of the transformer, and direct physical contact with power equipment is not needed, so that the safety of the system is improved, and the problem of high installation difficulty of a contact sensor is avoided; high-sensitivity, high-precision, anti-interference and real-time transformer direct-current magnetic bias current monitoring is achieved, and the transformer direct-current magnetic bias current monitoring device has the advantages of being easy to install and deploy and small in size.

The invention belongs to the technical field of optical fiber sensors, and particularly relates to a distributed optical fiber magnetic sensor, a preparation method thereof and a distributed measurement system. The optical fiber comprises an optical fiber and a magnetic composite matrix, a magnetic field measurement grating and a temperature compensation grating are arranged on the optical fiber; the magnetic composite matrix is formed by curing a magnetic composite suspension coating the outer side of the magnetic field measurement grating, the magnetic composite matrix comprises cured resin and magnetostrictive material particles uniformly distributed in the cured resin, and the magnetostrictive material particles are arranged in the cured resin in a predetermined orientation manner, so that the space monitoring range is expanded, and the magnetostrictive material particles are uniformly distributed in the cured resin; multi-point parallel measurement is achieved, and the defect that single-point measurement is prone to being disturbed by a local magnetic field is overcome; the technical problems of high precision, low cost, difficulty in deployment and long-section measurement of a magnetic field measurement sensor in the prior art are solved.

The invention belongs to the technical field of converter transformers, and particularly discloses a converter transformer vibration noise control method and system, a terminal and a medium, and the method comprises the steps: constructing a converter transformer structure geometric model, setting material attributes, and carrying out the grid division; based on the geometric model, establishing an electromagnetic field simulation model, applying excitation conditions, obtaining electromagnetic field distribution, establishing an iron core magnetostriction mathematical model, calculating vibration acceleration caused by magnetostriction and transient electromagnetic force of an iron core and a winding, and solving and extracting a displacement field and stress-strain response; establishing an acoustic coupling model on the basis of a structure vibration result, and calculating sound pressure level distribution under different frequencies by setting a structure-air coupling boundary and a matching layer; according to an acoustic simulation result, an iron core positioning structure and an oil tank reinforcing rib arrangement mode are optimized, vibration noise prediction and control of the converter transformer in a multi-harmonic excitation environment are realized, and equipment structure stability, operation reliability and environment adaptability are improved.

The invention discloses a model parameter identification method for hysteresis characteristics of a giant magnetostrictive material, and the method comprises the steps: describing the hysteresis characteristics through employing a nonlinear Jiles-Atherton model, and obtaining a hysteresis loop of the magnetostrictive material through constructing a mathematical model; the method comprises the following steps: performing parameter identification on hysteresis characteristics of a giant magnetostrictive material by using a longitudinal and transverse crossing strategy-based improved north pole sea-sparrow optimization algorithm, and improving the north pole sea-sparrow optimization algorithm by using a longitudinal and transverse crossing strategy to improve global optimization and local optimization capabilities of the algorithm; the model parameter identification method provided by the invention is simple in design and high in iteration efficiency, can replace a large number of manual parameter setting tests, can quickly obtain the optimal solution of the hysteresis model, and provides theoretical guidance for engineering application of the giant magnetostrictive material.

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.

The invention provides a non-conductive and non-magnetic material health state detection method based on a composite probe. The method comprises the following steps: packaging a magnetostriction integrated probe and starting scanning detection; a scanning path and detection points are preset, and an excitation signal is output to the detected material at each detection point; the magnetostriction integrated probe receives the signal, processes the signal to obtain an echo signal, and stores the echo signal in a computer; and performing linear ultrasonic echo signal processing by using a pre-trained BP neural network and an improved SVMD algorithm, and performing nonlinear ultrasonic echo signal processing in combination with fast Fourier transform to obtain linear echo information and nonlinear echo information, and analyzing the linear echo information and the nonlinear echo information to obtain a visual material health state assessment diagram. According to the invention, long-term stable detection in high and low temperature environments can be realized, multiple complex defects composed of tiny defects and large defects in the tested piece can be accurately obtained, and more effective health detection can be carried out.

The invention belongs to the technical field of precision machining, and particularly discloses a high-precision angle compensation device for a rotary workbench and a control method thereof.The compensation device comprises a base, a high-precision angle compensation driver, a rotary table and an angle measuring mechanism, the rotary table is arranged on the base, the high-precision angle compensation driver is arranged on the base, and the high-precision angle compensation driver is arranged on the rotary table. The rotating table is provided with an arc boss connected with the high-precision angle compensation driver, the high-precision angle compensation driver comprises a shell, a coil framework, an exciting coil and an arc-shaped giant magnetostrictive rod, and the angle measuring mechanism comprises an angle sensor, a support and a graduated scale. According to the high-precision angle compensation device for the rotary workbench and the control method of the high-precision angle compensation device, the high-precision angle compensation driver is designed according to the magnetostriction effect of a giant magnetostriction material, and bidirectional, large-stroke, high-response-speed and high-precision angle positioning of the rotary workbench is achieved.

The invention relates to the technical field of material magnetostriction, and discloses a hysteresis and magnetostriction strain simulation method and system for a ferromagnetic material. The non-hysteresis magnetization intensity of the ferromagnetic material is determined by utilizing the magnetization energy of the magnetic moments distributed in all directions on the ferromagnetic material in the magnetic field direction and the total free energy in the magnetic domain, and the magnetic energy density of the ferromagnetic material under the non-hysteresis magnetization intensity is determined according to the non-hysteresis magnetization intensity. According to the principle that the internal energy is minimum when the ferromagnetic material reaches mechanical balance, hysteresis and magnetostriction strain models corresponding to the ferromagnetic material under the condition that stress is applied or not are determined according to the magnetic energy density, so that the accuracy of hysteresis and magnetostriction strain simulation is effectively improved; and the simulation analysis of hysteresis and magnetostriction characteristics is more accurate and diversified.

A magnetostrictive torque sensor for measuring torque that is applied to a rotating shaft having magnetostrictive characteristics, includes a flexible substrate having a plate-shaped base material made of a flexible dielectric material and a plurality of detection coils formed by conductor patterns on front and back sides of the base material, and a measurement unit that measures the torque by the change in inductance of the plurality of detection coils due to the change in magnetic permeability of the rotating shaft, wherein the plurality of detection coils includes a first detection coil comprising a first coil winding including a first inclined portion inclined to one side with respect to an axial direction of the rotating shaft, and a second detection coil comprising a second coil winding including a second inclined portion inclined to the other side with respect to the axial direction of the rotating shaft, wherein the flexible substrate includes parallel extending portions where the first coil winding and the second coil winding extend parallel to sandwich the substrate, and wherein a centerline of the first coil winding and a centerline of the second coil winding are misaligned in a direction perpendicular to their respective centerlines in the parallel extending portions.

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 discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The invention is suitable for the technical field of power system maintenance, and provides a magnetostriction longitudinal ultrasonic guided wave excitation device and a ground wire damage detection method, the device comprises a box body and a connecting box slidably arranged on the box body; the mounting seat is fixedly mounted at the bottom of the inner wall of the box body; the group of threaded cylinders are rotationally mounted in the connecting box and on the mounting seat respectively, and threaded rods are mounted on the group of threaded cylinders in a threaded manner; the exciting coil and the receiving coil are respectively arranged on the group of threaded rods and are used for conducting ground wire damage detection; the bias magnetic field device is arranged at the bottom of the box body and is used for providing a bias magnetic field for the excitation coil; and the mounting mechanism is arranged on the box body and the group of threaded cylinders and is used for fixing the exciting coil and the receiving coil on the ground wire. The magnetostriction longitudinal ultrasonic guided wave excitation device and the ground wire damage detection method provided by the scheme have the advantages that the distance between the excitation coil and the receiving coil can be quickly adjusted, the installation efficiency is further improved, the installation process is simplified, and the device is convenient to carry and use.

The utility model relates to the field of detection devices, in particular to a magnetostriction liquid level meter detection device which comprises a fixing plate, a detection assembly and a supporting assembly. A supporting assembly used for supporting and damping to prevent the magnetostriction liquid level meter from being damaged is installed on the outer side of the fixing plate, and a detection assembly used for detecting liquid is installed in the fixing plate. The supporting assembly comprises a mounting base, a fixing block, a connecting block, a telescopic column, a damping spring, an electric push rod, a supporting plate, a suction cup, a flange, an electric cabinet, a mounting cavity, a threaded sleeve, a fixing nut, a quick connector, a connecting column and a damping pad, the mounting base used for supporting the magnetostriction liquid level meter is arranged at the center of the upper end of the fixing plate, and the flange is arranged at the center of the upper end of the mounting base; according to the magnetostriction liquid level meter detection device, displacement caused by external vibration or impact is prevented through the damping structure, the magnetostriction liquid level meter detection device can be kept horizontal all the time through the electric push rod, and the device can be installed and detached more rapidly through various rapid installation structures.

The invention provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

A multi-scale simulation modeling method for transformer vibration noise is disclosed. In the method, transformer parameters are collected to establish a two-dimensional axisymmetric model of the winding and a three-dimensional finite element model of the iron core and the oil tank. The two-dimensional axisymmetric model and the three-dimensional finite element model are used to construct a vibration coupling model including the iron core and the winding via a shared boundary. The sound pressure on the sound pressure contour surface of the two-dimensional axisymmetric model is extracted. After coordinate transformation, the sound pressure on the sound pressure contour surface of the two-dimensional axisymmetric model is mapped to the sound pressure on the sound pressure contour surface in the three-dimensional model. Based on the sound pressure on the sound pressure contour surface in the three-dimensional model, the magnetostriction of the iron core is simulated and calculated to obtain the time-domain calculation result of the magnetostriction. The time-domain calculation result of the magnetostriction is subjected to a fast Fourier transform to obtain the iron core deformation displacement distribution at different frequencies. The frequency response analysis of the two-dimensional axisymmetric model and the three-dimensional finite element model is carried out to calculate the winding vibration and the sound pressure distribution in the oil caused by the vibration of the iron core transmitted to the winding.

The invention provides a swivel bolt pre-tightening force monitoring device and method under a high temperature condition. The device comprises a magnetostriction sheet, a coil-only type EMAT detection probe, a multi-channel EMAT detection circuit and a signal processor, during monitoring, the magnetostrictive sheet is coupled with the swivel bolt, and the detection probe is placed around the swivel bolt; the detection circuit continuously introduces similar direct current into the plurality of coils of the detection probe and simultaneously introduces strong pulse current into each coil according to a preset sequence; the detection probe comprises a plurality of coils which generate a magnetic field under the action of introduced similar direct current; the magnetostrictive sheet generates telescopic vibration in a magnetic field, so that ultrasonic waves are generated on the surface of the swivel bolt; the detection probe receives an ultrasonic echo signal; and the signal processor analyzes the echo signal and extracts pre-tightening force information of the swivel bolt. According to the invention, on-line monitoring of the pre-tightening force of the swivel bolt under a high-temperature condition can be realized.

According to the magnetostriction vibration isolation device based on hydraulic amplification, the hydraulic amplification mechanism is adopted to amplify magnetostriction output displacement, meanwhile, vibration energy consumption can be conducted, and active and passive double vibration isolation performance is achieved. According to the device, a magnetostrictive material is used as an actuator, pre-compression is applied by compressing a disc spring, a bias magnetic field is provided by a permanent magnet, and a hydraulic amplification mechanism is driven by a driving magnetic field generated by a solenoid. Damping holes are distributed in a closed containing cavity of the hydraulic amplification mechanism, output of an actuator enables a large flexible diaphragm of the hydraulic amplification mechanism to deform and extrude hydraulic oil, the hydraulic oil can pass through the damping holes in a liquid containing cavity after being extruded, vibration energy is consumed, and meanwhile a small flexible diaphragm is made to deform to achieve the displacement amplification effect. Therefore, the device not only can amplify the magnetostrictive displacement and widen the active vibration isolation amplitude value, but also can consume the vibration energy through the damping holes to further improve the vibration isolation performance.

The invention discloses an inductor noise optimization method based on multi-physics field simulation, and belongs to the technical field of magnetic component simulation design. According to the method, COMSOL software is adopted to customize a solution domain equation to calculate three kinds of electromagnetic force coupling of Lorentz force, Maxwell force and magnetostriction force of the inductor, the coupling is converted into electromagnetic force in a frequency domain through Fourier transform, solid mechanical field simulation is carried out, and magnetostriction generated by an electromagnetic field is coupled to a solid mechanical field in a strain form; calculating the surface acceleration of the inductor in the frequency domain; and then simulating an external sound field of the inductor by taking the surface acceleration of the inductor in the frequency domain as an excitation source of pressure acoustics to obtain a change diagram of the sound pressure level at the noise point to be detected along with the frequency. By the adoption of the method, various electromagnetic forces borne by the inductor can be comprehensively considered, simulation time can be greatly shortened by conducting simulation of the solid mechanical field and the pressure acoustic field in the frequency domain, and therefore noise simulation of the inductor is accurately and efficiently completed.

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 a high-temperature-resistant coating type magnetostrictive ultrasonic transducer, and belongs to the field of ultrasonic nondestructive testing. The transducer is composed of a high-temperature-resistant ceramic coil and a high-temperature-resistant magnetostrictive coating prepared on the basis of Fe3O4 / AlNiCo composite powder. The method comprises the following steps: firstly, spraying Fe3O4 / AlNiCo composite powder to the surface of a to-be-detected workpiece to form a magnetostrictive coating tightly combined with the surface of the workpiece as a sensing unit for exciting and receiving ultrasonic waves; then carrying out magnetization treatment on the coating by utilizing a magnetization device, and establishing a stable static bias magnetic field; removing the magnetizing device, and applying a pulse current signal in the ceramic coil to generate a dynamic alternating magnetic field; finally, based on the magnetostrictive effect, ultrasonic waves are excited and received in the coating, and detection of defects in the to-be-detected workpiece is achieved. The transducer has the advantages of high temperature resistance and high signal-to-noise ratio, and is suitable for rapid spot check detection and long-term online monitoring of structures such as high-temperature pipelines and high-temperature pressure vessels.

A measuring system for measuring a flow parameter of a fluid flowing in a pipeline includes: a pipe; a bluff body arranged in the pipe and designed to generate vortices in the fluid flowing past the bluff body; a vortex sensor arranged downstream of the bluff body, the vortex sensor designed to produce mechanical vibrations upon being excited by the flowing fluid and to provide a vortex sensor signal and having a magnetostrictive material; a magnetic field detection unit designed to measure a change in a magnetic field resulting from mechanical forces acting on the magnetostrictive material and designed to provide a magnetic field detection signal; and transmitter electronics for analyzing the vortex sensor signal and for analyzing a functionality and / or a plausibility statement regarding the vortex sensor signal provided by the vortex sensor based on the magnetic field detection signal.

The invention provides an amorphous alloy magnetostriction measurement clamping mechanism and a measurement device. The amorphous alloy magnetostriction measurement clamping mechanism comprises a base, a sliding plate, a fixing unit and a pulling unit. When the amorphous alloy magnetostriction measurement clamping mechanism is used, the two ends of a strip can be connected to the supporting plates in a lap joint mode, and the strip is conveyed to the position close to the retaining wall through movement of the sliding plate. And the strip sheet is adjusted to be in a vertical detection state by turning over the supporting plate. Strip pieces are sequentially placed on the supporting plates, the multiple strip pieces are placed by moving the supporting plates and turning over the supporting plates, and finally the multiple sets of strip pieces are fixed to the supporting base on one side through the fixing unit. And the pulling unit is used for pulling the other end of the strip to simulate the tensile force of the strip in the transformer. The operation is convenient, and the installation and fixation of the strip in the experiment process are facilitated.

The utility model discloses a static leveling instrument for settlement monitoring. The static leveling instrument comprises a measuring cylinder and a floating ball type magnetostrictive sensor, the measuring cylinder comprises a transparent liquid level cylinder, the top end is provided with a top cover with an air hole, and the bottom end is connected with a shell; two liquid passing joints communicated with the upper chamber are arranged at the upper part of the shell, two aviation sockets are arranged at the lower part, and a base is sealed at the bottom end; the floating ball type magnetostriction sensor is arranged in the measuring cylinder in the mode that a measuring rod is vertically upward, an upper cavity and a lower cavity of the shell are separated through a fixing base arranged on the outer side of the measuring rod in a sleeving mode, an electronic bin of the floating ball type magnetostriction sensor is arranged in the lower cavity and connected with the two aviation sockets, and a magnetic floating ball of the floating ball type magnetostriction sensor is located in the liquid level cylinder. The static leveling instrument for settlement monitoring not only solves the problem that the precision is reduced when a traditional sensor is used for a long time, but also can drive the liquid level floating ball to settle by utilizing the liquid level change of a settlement monitoring point position, so as to realize long-term remote monitoring of the height settlement condition of the position through the liquid level height change.

The invention provides a substation settlement monitoring method and system, and relates to the technical field of settlement monitoring, and the method comprises the steps: deploying a bionic root system mesh array sensor network which comprises a plurality of monitoring nodes; collecting current phase data of a transformer substation bus in real time to calculate magnetic field interference, and performing inverse compensation on an original displacement signal of the magnetostrictive displacement sensor; carrying out vibration monitoring through a triaxial accelerometer, and carrying out data weight adjustment on a plurality of monitoring nodes; and performing settlement prediction on the transformer substation according to the displacement compensation data in combination with the weight parameters of the plurality of nodes, performing backtracking calibration on the bionic root system mesh array sensor network, and performing closed-loop monitoring on the settlement of the transformer substation according to a calibration result. The technical problem of inaccurate settlement monitoring caused by interference in a high-intensity magnetic field environment of the transformer substation in the prior art is solved, and accurate prediction and closed-loop monitoring of settlement of the transformer substation are realized by deploying a plurality of intelligent sensors and performing magnetic field interference compensation.

The invention discloses a high-sensitivity optical fiber magnetic field sensor based on extrinsic F-P interference, and the sensor employs Terfenol-D as a sensitive element, employs a permanent magnet to provide a bias magnetic field, and improves the conversion efficiency of a magnetostrictive rod. A high-precision F-P cavity is formed by accurately aligning the end face of the single-mode optical fiber with the surface of the permanent magnet. Experimental results show that the highest sensitivity of the sensor within the range of 0-150 [mu] T reaches 676 nm / mT, and the corresponding magnetic field resolution is 147 nT. The integrated reference FBG is used for monitoring temperature changes, and the problem of temperature cross sensitivity is effectively solved. The design based on a first-generation EFPI sensor is further optimized, an improved sensor with adjustable magnetic bias is provided, and the linearity is improved to 99.2%. The sensitivity of the improved sensor in the same magnetic field range reaches 826 nm / mT, the magnetic field resolution is 121 nT, and the improved sensor shows good linear characteristics and temperature stability.

The invention discloses a magnetic-thermal response type phononic crystal plate device and an elastic trough state transmission characteristic regulation and control method thereof, and relates to the technical field of novel artificial metamaterials. The magnetic-thermal response type phononic crystal plate device comprises a magnetic-thermal-elastic phononic crystal plate and a plurality of magnets and thermoelectric pieces; the phononic crystal plate is formed by arranging a plurality of unit cell structures, and each unit cell is composed of a magnetostrictive column and an aluminum plate; the external magnetic field is regulated and controlled by adjusting the distance between the magnet blocks; the temperature of different magnetostriction columns is controlled by controlling the thermoelectric pieces, so that the adjustment of a temperature field is realized; a broadband elastic trough Hall interface state is induced to be generated, and dynamic adjustability of magnetic-thermal dual excitation to a trough topology transmission path is achieved on the premise that the structure is not changed. The technical problem that the frequency of the elastic trough Hall interface state and the topological transmission path are difficult to dynamically regulate and control on the premise that the structure of a traditional topological photonic crystal is not changed is solved.

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.