119results about "Permeability measurements" patented technology

The invention provides an intelligent material damage diagnosis method and system based on magnetic characteristic data fusion, and relates to the technical field of nondestructive testing, and the method comprises the following steps: collecting magnetic characteristic data by using a magnetic stress detection robot; performing multi-scale decomposition on the data to construct a magnetic domain evolution characteristic spectrum; inputting the characteristic spectrum into a composite neural network to extract a material damage characteristic matrix; constructing a fusion feature vector by using tensor dimensionality reduction and a multilayer belief transfer network; and realizing damage calculation through temperature field modulation and self-adaptive weight distribution to obtain the damage grade and the residual life. According to the invention, accurate diagnosis of the material damage in the welding seam area of the pressure vessel is realized.

The invention relates to the technical field of bearing detection, and discloses a bearing fault diagnosis method and system, and the system comprises the steps that an acquisition unit collects magnetic signals of a to-be-detected bearing in a non-contact manner in the operation process of the to-be-detected bearing, and the magnetic signals specifically comprise magnetic flux density and magnetic conductivity; the preprocessing unit is used for preprocessing the acquired magnetic signals to form signal fragments to be analyzed; the first processing unit judges whether an early fault exists or not according to the preprocessed magnetic conductivity; the second processing unit extracts a fault discrimination feature vector based on Hilbert transform and wavelet packet reconstruction, inputs the fault discrimination feature vector into a historical discrimination database or a health state baseline model, and outputs a judgment result of a fault degree; the early warning unit determines an alarm level according to the fault degree and an early fault. According to the method, continuous sensing of multi-stage fault states is realized, and the recognition capability of early micro-damage such as fatigue cracks and local stripping is effectively improved.

The invention discloses a composite shielding material effect experiment data analysis method, and particularly relates to the field of material shielding effect analysis, and the method comprises the following steps: measuring key data such as dielectric constant, magnetic conductivity, conductivity and thickness of each layer of a composite shielding material through an electromagnetic performance measurement instrument; establishing an electromagnetic wave propagation model for describing propagation of electromagnetic waves in the multilayer medium based on a Maxwell equation, and defining boundary conditions of a test sample; time domain and frequency domain characteristics of an electromagnetic interference source are simulated through Fourier transform, and actual input interference is simulated. And analyzing the dynamic response of the electromagnetic wave propagation model under transient and steady-state interference signals to form an electromagnetic wave interference response propagation model. Through comparison with actual shielding effectiveness test data, model parameters are adjusted, and it is ensured that model calculation errors are within an acceptable range. A full-band shielding effectiveness prediction map of the composite shielding material is generated based on the model, and theoretical support is provided for material design and optimization.

The invention discloses an inductance material electromagnetic performance prediction method and system based on machine learning, and the method comprises the steps: collecting inductance performance index data, carrying out the data preprocessing of an inductance material performance index optimization data set, and carrying out the visualization of the data set, and obtaining the linear relation between the variables of the quantized inductance material performance index optimization data set. Through inductance material magnetic conductivity prediction, saturated magnetic field intensity prediction and inductance material electromagnetic performance prediction, inductance material electromagnetic performance characterization reference data are finally obtained. According to the method, the potential nonlinear relationship among the inductance raw materials is mined by utilizing the powerful calculation learning capability of the machine learning model, so that the raw material selection and formula design of inductance products with different specifications are accurately guided.

This application proposes a magnetic coupling coil optimization method. The method comprises: calculating an equivalent magnetic permeability of a magnetic coupling coil based on an air gap length of the magnetic coupling coil; calculating an effective cross-sectional area of the magnetic coupling coil based on the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating a number of turns of the secondary winding of the magnetic coupling coil based on the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil based on the number of turns of the secondary winding. The present application can reasonably configure the parameters of the magnetic coupling coil, effectively acquire energy from the power grid to provide stable power for detection or communication equipment in the power grid, and make the magnetic coupling coil more reliable while meeting the power demand.

The invention relates to the field of fusion devices, and discloses an acceptance inspection method and device for a cold shield device, the cold shield device comprises a plurality of cold shield sectors, each cold shield sector comprises an outer panel, an inner panel and a connecting assembly, the outer panel is provided with a half window, and the half windows between partial adjacent two of the plurality of outer panels are arranged adjacently; the method comprises the following steps: mounting a plurality of window fixing plates on a test bracket; the half window of the outer panel is installed on the window fixing plate in a matched mode, and the half window, the inner panel and the connecting assembly are assembled to form a cold screen sector; and scanning the cold shield sector to obtain measurement data, comparing the measurement data with theoretical data of the theoretical model of the cold shield sector to obtain a comparison result, and determining whether the cold shield sector is qualified or not according to the comparison result. According to the invention, the supporting and stress states during real assembly can be simulated for the assembly of the cold shield fan section, and the quality control of the cold shield fan section in the manufacturing and acceptance handover process can be realized.

The invention relates to the technical field of grain detection, discloses a grain electromagnetic parameter measuring device and method, and aims at solving the problem that an existing electromagnetic parameter detecting method is poor in accuracy, and the scheme mainly comprises a temperature sensor, a coaxial transmission line structure, a vector network analyzer and a control module. The coaxial transmission line structure comprises a cylindrical inner conductor and a cylindrical outer conductor, the inner conductor is located on the central axis of the outer conductor, and a hollow structure is formed between the inner conductor and the outer conductor; the hollow structure is used for filling grain, the temperature sensor is used for detecting grain temperature, the vector network analyzer is used for calculating electromagnetic parameters of the grain according to amplitudes and phases of output electromagnetic wave signals and input electromagnetic wave signals, and the control module is used for constructing a mapping relation between the grain temperature and the electromagnetic parameters. The mapping relation is used for grain pile temperature detection; the radiuses of the inner conductor and the outer conductor satisfy impedance matching conditions. The accuracy of grain electromagnetic parameter measurement is improved, and the method is suitable for various grains.

The invention relates to the technical field of magnetic variable measurement, in particular to a nondestructive testing method and device for magnetic conductivity of flaky metal magnetic powder, and the method comprises the following steps: acquiring initial sensitivity obtained by detecting the flaky metal magnetic powder to be detected by a detection coil in an initial state, and if the initial sensitivity is less than a preset sensitivity threshold value, determining that the flaky metal magnetic powder to be detected is detected; if not, adjusting the initial number of turns according to the minimum coil number of turns increase value to obtain an adjusted number of turns until the correction sensitivity of the detection coil in the latest state is greater than or equal to a preset sensitivity threshold value, so as to improve the induction sensitivity of the detection coil to the inductance value of a small-size sample of flaky metal magnetic powder. Further, the accuracy degree of magnetic conductivity detection of the flaky metal magnetic powder is improved; and obtaining the damage probability of the to-be-detected flaky metal magnetic powder obtained in the process that the detection coil detects the to-be-detected flaky metal magnetic powder in the latest state, and adjusting the initial excitation current based on the damage probability to reduce the damage probability of the to-be-detected flaky metal magnetic powder in the detection process.

The invention provides a method for testing the initial permeability of a soft magnetic material. The method comprises the following steps: arranging a protection box for a sample; confirming the number of turns of the magnetizing coil; confirming the number of turns of the induction coil; uniformly winding an induction coil and a magnetizing coil outside the protection box; inputting current to the magnetizing coil through test equipment, and calculating the test magnetic conductivity mu test of the test sample based on the magnetic flux of the induction coil and the sectional area S sample of the sample; and calculating the initial permeability [mu] real of the sample according to the test permeability [mu] test of the sample, the permeability [mu] box of the protection box, the sectional area S box of the protection box, the permeability [mu] gas of the air gap between the protection box and the sample, and the sectional area S gas of the air gap.

The invention relates to an electromagnetic performance evaluation method and device of a round wire, computer equipment, a storage medium and a program product. The method comprises the following steps: acquiring basic parameters and grid parameters of a to-be-detected area; the basic parameters comprise a dielectric constant, an initial electromagnetic field parameter, conductivity and magnetic conductivity, and the grid parameters comprise a grid size and an electromagnetic field parameter in each grid; constructing an electromagnetic performance evaluation model of the to-be-tested area according to the basic parameters of the to-be-tested area and the grid parameters of the to-be-tested area; the to-be-detected area comprises a round wire area and a round wire adjacent area; the electromagnetic performance evaluation model of the to-be-tested area is obtained based on the broadband internal impedance of the to-be-tested area and the structure of the round wire area; and analyzing the electromagnetic performance evaluation model, and determining electromagnetic field parameters of the to-be-detected area. By adopting the method, the efficiency of determining the electromagnetic field parameters of the to-be-detected area can be improved.

The invention belongs to the field of magnetic core loss measurement, and particularly relates to a thin film magnetic core high-frequency loss measurement method. According to the technical scheme, an initial magnetization curve and hysteresis loops under different external magnetic field intensities are measured by using a vibration sample magnetometer (VSM), then a two-winding method measurement platform is built, and high-frequency phase deviation is calibrated by using an air core transformer; after the loss curve of the laminated thin film magnetic core is obtained through calculation, a finite element model containing the thin film magnetic core is established and corrected; and finally, determining the complex permeability of the laminated thin film magnetic core, substituting the complex permeability into the finite element model, eliminating the influence of the air core coupling main magnetic flux on the magnetic induction intensity measurement value in the thin film magnetic core, carrying out iterative updating on the loss curve, and taking the loss curve obtained by the last iterative updating as output. According to the technical scheme, the thin film magnetic core loss suitable for magnetic integration under high frequency can be accurately measured.

The invention relates to the technical field of low-temperature environment simulation and material characteristic test, in particular to a high-speed rail traction system fault diagnosis method based on electromagnetic parameter fusion, which is used for solving the problems of material electromagnetic characteristic test distortion and fault diagnosis algorithm verification deficiency in a high and cold environment. The method comprises the following steps: constructing a multi-physical field coupling test environment, simulating temperature cycle and humidity sudden change working conditions from-50 DEG C to + 80 DEG C, and synchronously acquiring dynamic parameters of resistivity, dielectric loss and magnetic conductivity; according to the method, the limitation of a traditional static test is broken through, the real representation of the material performance degradation rule is realized, a closed-loop verification system of laboratory and field data is constructed, and the performance of the material is verified. The accuracy and environmental adaptability of fault diagnosis in a high and cold environment are remarkably improved, and reliable guarantee is provided for safe operation of a traction system under an extreme working condition.

The present invention discloses an electromagnetic property measurement device and system and an electromagnetic property measurement method, wherein the electromagnetic property measurement device comprises a magnetic conductive structure, a coil and a scattering parameter measuring device. The magnetic conductive structure comprises a first side facing a sample to be measured and a second side relative to the first side, wherein the first side has a magnetic gap. The coil surrounds the magnetic conductive structure to generate a magnetic field with the magnetic conductive structure. The scattering parameter measuring device is arranged on the first side and is located within the range of the magnetic field.

Provided is a magnetic permeability measuring method that makes it possible to highly accurately measure the magnetic permeability of a magnetic material, especially a thick film-shaped magnetic material having a relatively large film thickness. This magnetic permeability measuring method comprises: a step for measuring a measured permeability coefficient of a magnetic material using a measurement probe; a step for setting an analysis model corresponding to a measurement condition of the measuring step, and calculating a calculated permeability coefficient of the magnetic material in the analysis model and a magnetic permeability of the magnetic material corresponding to the calculated permeability coefficient by finite element analysis; a step for acquiring first sets which are a plurality of sets of the real part and the imaginary part of a magnetic permeability corresponding to the real part of the calculated permeability coefficient that matches the real part of the measured permeability coefficient; a step for acquiring second sets which are a plurality of sets of the real part and the imaginary part of a magnetic permeability corresponding to the imaginary part of the calculated permeability coefficient that matches the imaginary part of the measured permeability coefficient; and a step for determining a magnetic permeability with a matching real part and a matching imaginary part from among the first and second sets.

The application provides a kind of bar type magnetic core effective permeability low frequency distribution measurement method and device, it is related to low frequency fluctuation detection and application technical field.The method comprises: winding test coil on coil framework, the winding length of test coil is measured and the number of turns is recorded;Test magnetic core is inserted into different positions of test coil, and the inductance of test coil is measured when test magnetic core is in different positions;According to the relationship between permeability and inductance, the area average effective permeability of test magnetic core in different positions is calculated;Based on the preset algorithm, the effective permeability distribution function of test magnetic core is fitted;According to the effective permeability distribution function of test magnetic core, the effective permeability distribution function of the bar type iron-based nanocrystalline alloy magnetic core to be measured is obtained.The application can reduce the measurement error of magnetic core effective permeability, improve the modeling reliability, and obtain the effective permeability distribution function, so as to reduce repeated experiments and improve the modeling efficiency.

A sensor apparatus for determining and / or monitoring a process variable of a medium in a containment includes: a crystal body including at least one defect; a magnetic field system for producing a magnetic field in the region of the crystal body and in the region of the medium within the containment, wherein the crystal body and the magnetic field system are arrangeable from the outside at a wall of the containment; a detection unit for detecting a magnetic field-dependent, fluorescent signal from the crystal body, wherein the detection unit has an excitation unit for optical exciting of the defect and a detector for detecting the fluorescent signal; and an evaluation unit for ascertaining at least one piece of information concerning the process variable based on the fluorescent signal.

The present invention provides a method and system for intelligent diagnosis of material damage by magnetic characteristic data fusion, which relates to the field of nondestructive testing technology. The method includes using a magnetic stress detection robot to collect magnetic characteristic data; performing multi-scale decomposition on the data to construct a magnetic domain evolution feature spectrum; inputting the feature spectrum into a composite neuron network to extract a material damage feature matrix; constructing a fusion feature vector by using tensor dimensionality reduction and a multi-layer belief transfer network; and realizing damage calculation through temperature field modulation and adaptive weight allocation to obtain the damage level and remaining life. The present invention realizes the accurate diagnosis of material damage in the weld area of a pressure vessel.

This invention provides a method for constructing a magnetic property measurement system for magnetic materials based on an LLC resonant circuit, belonging to the field of switching converter technology. The measurement system includes: a DC power supply. V in Square wave generator, resonant capacitor C r Resonant inductor L r Magnetic ring, primary winding of magnetic ring L p Secondary winding of magnetic ring L s rectifier and filter capacitor C 0. Load L o And a power analyzer; wherein, the magnetic ring is made based on the magnetic material to be tested; wherein, a DC power supply V in Square wave generator, resonant capacitor C r and resonant inductor L r Connect sequentially and connect to the primary winding of the magnetic ring. L p resonant capacitor C r Resonant inductor L r and the primary winding of the magnetic ring L p excitation inductor L m Forming a resonant circuit; the rectifier is connected to the secondary winding of the magnetic ring. L s A filter capacitor is connected in parallel across the rectifier. C 0 and load L o A power analyzer is used to collect the primary-side current and secondary-side voltage of a magnetic ring to determine the magnetic characteristic parameters of the magnetic material under test. This invention can reduce the error in the measurement results of the magnetic characteristics of magnetic materials.

The application discloses a kind of anti DC bias magnetic methods and current transformers based on magnetic permeability feedback compensation, comprising: the magnetic permeability of current transformer core is acquired in real time by magnetic permeability measuring unit;According to the relationship model of magnetic permeability and DC component established in advance, the DC component of invading current transformer is determined based on the magnetic permeability acquired;DC bias compensation unit generates reverse DC counter-biasing according to the DC component determined on compensation winding.The application realizes real-time monitoring and dynamic compensation adjustment to the magnetization state of transformer core by introducing magnetic permeability measuring unit and magnetic permeability feedback control, compared with traditional open-loop compensation or simple current feedback, can more accurately judge the saturation degree of magnetic core, adjusts compensation strategy in time according to the change of magnetic core state, effectively avoids compensation lag or overcompensation problem, improves the adaptability and measurement stability of transformer in complex current environment.

The invention discloses an auxiliary device and method for rapidly determining three parameters of soft magnetic composite powder, and belongs to the technical field of soft magnetic material performance testing. The invention provides a simple device and method based on a medical injector and an insulated copper wire, aiming at solving the problems that a traditional testing method depends on complex equipment, steps are tedious, the cost is high and the efficiency is low. By measuring the inductance and the resistance of the coil and combining calculation of the size of an inner cavity of the injector and the length of a magnetic circuit, the quality factor, the effective magnetic conductivity and the direct-current bias of the soft magnetic powder can be quickly and accurately calculated. The device is simple in structure, mainly comprises an injector, an insulated copper wire, soft magnetic powder and an insulated rubber tape or transparent adhesive tape, and is convenient to operate and low in cost. The method is especially suitable for rapid quality detection of a production field and preliminary performance evaluation of a laboratory, can significantly improve the test efficiency and reduce the test cost, and has the advantages of simplicity, rapidness, low cost and high applicability.

The invention provides a magnetic material magnetic property measurement system based on an LLC resonance circuit and a construction method, and belongs to the technical field of switching converters. The measuring system comprises a direct-current power supply Vin, a square-wave generator, a resonant capacitor Cr, a resonant inductor Lr, a magnetic ring, a magnetic ring primary winding Lp, a magnetic ring secondary winding Ls, a rectifier, a filter capacitor C0, a load Lo and a power analyzer. Wherein the magnetic ring is made of a to-be-tested magnetic material; wherein the direct-current power supply Vin, the square-wave generator, the resonant capacitor Cr and the resonant inductor Lr are connected in sequence and are connected to the magnetic ring primary winding Lp; the resonant capacitor Cr, the resonant inductor Lr and the excitation inductor Lm of the magnetic ring primary winding Lp form a resonant circuit; the rectifier is connected with a secondary winding Ls of the magnetic ring; two ends of the rectifier are connected in parallel with a filter capacitor C0 and a load Lo; and the power analyzer is used for acquiring the primary side current and the secondary side voltage of the magnetic ring to determine the magnetic characteristic parameters of the magnetic material to be detected. The invention can reduce the error of the magnetic property measurement result of the magnetic material.

The invention relates to the field of composite material electromagnetic parameter testing, in particular to a composite material electromagnetic parameter automatic testing system based on vector network analysis. The data acquisition module is used for acquiring electromagnetic characteristic parameters through the vector network analyzer; acquiring an environment temperature; analyzing an electromagnetic characteristic characterization value according to the electromagnetic characteristic parameters through a data analysis module; evaluating whether the electromagnetic parameter automatic test system meets the standard or not through a standard evaluation module; determining, by the compensation control module, a cause of non-compliance with the criteria based on the ambient temperature; and determining to start a test area temperature compensation device or determine whether to start an electromagnetic shielding device based on the reason that the test area does not accord with the standard. By analyzing the reason that the automatic test system does not meet the standard, the environment temperature is adjusted or the electromagnetic interference is eliminated according to the reason, so that the precision of the automatic test system for the electromagnetic parameters of the composite material based on vector network analysis is remarkably improved.

The present application proposes a method for optimizing a magnetic coupling coil, the method comprising: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil according to the number of secondary end turns. The present application calculates the average magnetic path length and the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil, and calculates the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; the parameters of the magnetic coupling coil can be reasonably configured, and energy can be effectively obtained from the power grid to provide a stable power supply for detection or communication equipment in the power grid, and the magnetic coupling coil can be made more reliable while meeting the power requirements.

This invention relates to a testing device for the magnetic properties of high-permeability materials under low-frequency weak magnetic environments, comprising: a coil assembly, a magnetic property tester, a magnetic shielding cylinder, and a host computer; the coil assembly is wound around the sample under test and connected to the magnetic property tester, and the sample under test with the coil assembly placed inside the magnetic shielding cylinder; the magnetic shielding cylinder provides a weak magnetic environment for the sample under test; the magnetic property tester is used to provide excitation current to the coil assembly and detect the induced voltage of the sample under test, and transmit the measured data to the host computer; the host computer is used to acquire the data measured by the magnetic property tester and plot the magnetization curve. The technical solution of this invention solves the problem that current magnetic property testing devices for magnetic materials cannot obtain the permeability of high-permeability materials under low-frequency weak magnetic environments, thereby improving the accuracy and precision of theoretical and simulation calculations of magnetic shielding devices and reducing the error between design and actual values.

The invention provides a system and a method for measuring electromagnetic parameters of a material in a strong microwave electric field environment based on parallel strip lines, and belongs to the technical field of microwave testing. According to the invention, a double-sided parallel strip line with a slotted structure is innovatively designed, a measurement system under strong microwave electric field loading is constructed based on the double-sided parallel strip line, a to-be-tested sample is tested in a mode of separating a test frequency from a strong microwave electric field frequency, and a reflection coefficient and a transmission coefficient of the to-be-tested sample are obtained; therefore, the electromagnetic parameters of the to-be-tested material in the microwave strong field loading environment are calculated. According to the measurement system, decoupling of the test frequency and the strong microwave electric field frequency is realized, that is, the test frequency is no longer determined by setting of the microwave electric field frequency, so that test requirements under different frequencies are met.

The present invention relates to the field of data processing technology, and specifically to a method and system for online monitoring the inductance of an inductor device, comprising: determining the magnetic leakage ratio of the inductor device at the current moment based on the proportion of the core insertion length in the coil length at the current moment, combined with the minimum and maximum magnetic leakage ratios, then determining the effective change in the magnetic permeability of the core of the inductor device at the current moment, determining the effective total magnetic resistance of the electromagnetic device at the current moment based on the vacuum magnetic permeability, the coil length, the relative magnetic permeability and cross-sectional area of ​​the core, and the core insertion length at the current moment, combined with the effective change, and determining the true effective inductance of the inductor device at the current moment based on the effective total magnetic resistance and the number of coil turns, combined with the magnetic leakage ratio of the inductor device at the current moment. The present invention improves the accuracy of online monitoring of the inductance of the inductor device.

Provided herein is a magnetic permeability measuring method including measuring a measured permeability coefficient of the magnetic material using a measuring probe; setting an analysis model corresponding to a measurement condition, and calculating, using finite element analysis, a calculated permeability coefficient of the magnetic material in the analysis model and the magnetic permeability of the magnetic material corresponding to the calculated permeability coefficient; acquiring a first set including a plurality of pairs of real-parts and imaginary-parts of the magnetic permeability corresponding to a real-part of the calculated permeability coefficient that matches a real-part of the measured permeability coefficient; acquiring a second set including a plurality of pairs of real-parts and imaginary-parts of the magnetic permeability corresponding to an imaginary-part of the calculated permeability coefficient that matches an imaginary-part of the measured permeability coefficient; and determining the magnetic permeability whose real-part and imaginary-part match in the first and second sets.

The probe for measuring a magnetic permeability of a magnetic material includes: a transmission line body including a strip-shaped strip conductor formed on a front surface of a dielectric substrate and a ground conductor formed on the front surface or a back surface of the dielectric substrate; a first connector connected to one end of each of the strip conductor and the ground conductor; and a second connector connected to the other end of each of the strip conductor and the ground conductor, in which the strip conductor includes a first length portion including a portion connected to the first connector on one end side, a second length portion including a portion connected to the second connector at the other end, and a third length portion extending between the first length portion and the second length portion, and the third length portion includes a current deviation prevention unit.

The invention relates to a material magnetic permeability temperature stability testing device and method based on an atomic magnetometer, characterized in that the device comprises an atomic magnetometer, a magnetic material layer, a flexible heating coil, a temperature sensor, a simulated magnetic field coil, a magnetic shielding unit, a magnetic field control module, a temperature data acquisition module, a temperature control module, a magnetometer circuit acquisition control module, and a multifunctional host computer. The atomic magnetometer tests the magnetic shielding coefficient of the magnetic material layer. After the flexible heating coil heats the magnetic material layer to a specific temperature, the atomic magnetometer measures magnetic noise and incorporates the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures. The temperature stability of the material magnetic permeability is analyzed, which is conducive to in-situ measurement of the magnetic permeability temperature stability of the formed magnetic shielding barrel material. At the same time, the device can effectively avoid the problems of multiple measurements, the influence of the number of coil turns, and the inability to flexibly adjust the test voltage and frequency in traditional magnetic permeability testing methods.