84 results about "Electromagnetism" patented technology

The invention discloses a multi-physical field coupling simulation analysis method and system for power business, and relates to the technical field of power business environment change analysis, and the method comprises the following steps: 1, obtaining physical field data of a power business scene, the physical field data comprising a temperature field, a stress field, a displacement field, a magnetic field and an electric field of power equipment; and step 2, carrying out coupling calculation on the physical field data by using the multi-physical field simulation model, according to the multi-physical field coupling simulation analysis method and system for the power business, through coupling and building of different models in the multi-physical field simulation model, coupling simulation of power equipment in a complex multi-physical field environment can be realized, and the coupling simulation efficiency is improved. The simulation model can accurately predict dynamic changes of multiple physical fields such as electromagnetism, heat effect and mechanical stress of the equipment, help to optimize design and operation strategies of the power equipment, and improve reliability and safety of the equipment.

The invention provides an electromagnetic field prediction method and device and electronic equipment, and relates to the technical field of electromagnetic field solving. The method comprises the following steps: acquiring historical electromagnetic original data in a field-line coupling scene, preprocessing the historical electromagnetic original data, inputting the preprocessed historical electromagnetic original data into an LSTM-PINN model, and outputting a physical field quantity mapping result; wherein the physical field quantity comprises an electric field component and a magnetic field component; setting a weighted loss function, and performing optimization training on the LSTM-PINN model based on a physical field quantity mapping result and an error of a real physical field quantity corresponding to historical electromagnetic original data to obtain a trained electromagnetic field prediction model; wherein the weighted loss function comprises a data loss function, a physical residual loss function, an initial condition loss function and a boundary condition loss function; and inputting real-time electromagnetic original data into the trained electromagnetic field prediction model to obtain a spatio-temporal distribution electromagnetic field prediction result. The method can effectively extract the spatial distribution features and the time sequence features at the same time, and is suitable for a complex field-line coupling problem.

The embodiment of the invention discloses a transformer transient temperature rise prediction method and device and a storage medium, and the method comprises the steps: constructing a two-dimensional model, calculating the magnetic flux density distribution conditions of a transformer iron core and a winding under a first preset load rate condition, and further obtaining an iron core loss value and an eddy current loss value of the winding, the method is used as heat source excitation of a temperature-flow field of the transformer, a step type function is adopted for representation and is substituted into a heat flow field coupling calculation model, electromagnetism, fluid mechanics, heat transfer theory and a finite element method are involved, and the problem that transient temperature rise simulation calculation of the dry type transformer under different load rates is difficult to converge can be effectively and accurately solved.

The invention discloses a 2D-CNN network wake flow electromagnetic field detection method based on wavelet transform time-frequency spectrum characteristics. The method comprises the steps of (1) generating an underwater vehicle wake flow electromagnetic field calculation data set through a multi-physics field coupling method of hydrodynamics and electromagnetism, (2) extracting time-frequency spectrum features of a wake flow electromagnetic field through wavelet transform, and (3) developing a wake flow electromagnetic field detection model based on a 2D-CNN deep neural network. And training the model by using the data after the wavelet transform for wake flow electromagnetic field detection. According to the 2D-CNN network wake flow electromagnetic field detection method based on the wavelet transform time-frequency spectrum characteristics, the detection capability of the wake flow electromagnetic field can be effectively improved, a new technical means is provided for detection of the wake flow electromagnetic field of an underwater vehicle, and the method has a good application prospect in the field of marine target electromagnetic field monitoring and early warning.

The invention belongs to the technical field of geological engineering monitoring and multi-physics field intelligent sensing, and discloses a separation grouting slurry migration monitoring method and system, and the method comprises the steps: constructing an acoustics-optics-electricity-electromagnetism multi-physics field coupling monitoring system; a grouting hole and a monitoring drilling hole array are arranged in a target stratum, a distributed optical fiber sensor, a drilling hole ultrasonic imager, a resistivity measuring device and a transient electromagnetic detection device are installed, and a three-dimensional monitoring network is formed; synchronously acquiring sound field, light field, electric field and magnetic field data; four-field monitoring data and overlying strata multi-parameter observation data are fused, a coal seam mining three-dimensional overlying strata separation model is constructed, and a slurry diffusion three-dimensional visualization model is generated through numerical simulation; and based on the four-field monitoring response difference of the separation space before and after grouting, in combination with a monitoring frequency domain correction model of multiple indexes of grout diffusion, the diffusion range, compactness and filling effect of the grouting grout are evaluated, and abnormal early warning is triggered.

The invention discloses a magnetic moment comparator device and a measurement method. The magnetic moment of the current-carrying standard coil is in direct proportion to the magnetic field generated at a fixed distance on the axis, and according to the principle that a magnetic dipole layer and the current-carrying coil have equivalence in electromagnetism, when the space magnetic field can be accurately measured, the current-carrying standard coil can be used for measuring the magnetic moment of a magnetic sample at the same position. A magnetic moment comparator is designed in a magnetic shielding cylinder, an atomic magnetometer is used for measuring an absolute magnetic field with high sensitivity, a current-carrying standard coil is placed at the position, with the distance being r0, of one side of an atomic gas chamber in the direction of a background magnetic field, and the axis of the current-carrying standard coil is parallel to the direction of the background magnetic field; the magnetic moment direction of the magnetic sample is parallel to the background magnetic field direction, when the magnetic sample is moved by the sample transfer rod to the position, which is r0 away from the atomic gas chamber, of the other side of the atomic gas chamber, the current introduced into the standard coil is changed in real time by keeping the background magnetic field unchanged as a judgment condition, and the magnetic moment of the magnetic sample is equal to the magnetic moment of the current-carrying standard coil; the directions are opposite.

The invention relates to a friction and electromagnetic combined type wave energy power generation device, and relates to the field of wave energy power generation devices. Comprising a cylindrical shell, a floating ball structure and a stress disc. The first end of the cylindrical shell is sealed, a fixed shaft is fixed to the inner axis and slidably sleeved with a sliding framework, and a composite power generation assembly is arranged in the cylindrical shell. When waves exist on the sea surface, due to the fact that the floating ball structure is subjected to buoyancy and thrust of the waves, the stress disc and the floating ball structure are subjected to opposite force, and the sliding framework can move relative to the fixed shaft, so that electromagnetic power generation and friction power generation are achieved. Even if the sea surface is flat and quiet, as long as the water body below the sea surface flows relatively and the flow velocity difference exists between the upper part and the lower part of the stress disc, buoyancy or sinking force can be generated, the sliding framework can move relative to the fixed shaft, and finally electromagnetic power generation and friction power generation are realized, so that the power generation efficiency is effectively improved.

The invention relates to the field of electromagnetism, in particular to a micro-magnetic method for predicting magnetic characteristics of a magnetic sample, which comprises the following steps of: (1) constructing a plurality of magnet models with different magnetic domain sizes, shapes and magnetic domain numbers, and determining magnetic parameters of the magnet models; (2) placing the to-be-measured magnet under a preset external field condition to obtain the magnetization intensity of the to-be-measured magnet, and comparing the magnetization intensity with the measurement result of each model under the same external field condition; (3) determining the similarity between the to-be-tested magnet and each model, finding out the model with the highest similarity, and calling each magnetic parameter of the model; and (4) determining the external field condition of the magnet to be detected in the new target environment.

The invention relates to geophysical inversion, in particular to an electromagnetic inversion method based on well electric-seismic joint modeling, which comprises the following steps: acquiring actually measured apparent resistivity data; well-to-seismic joint stratum thickness and stratum apparent resistivity modeling based on geosteering; performing one-dimensional band source apparent resistivity inversion based on a nonlinear least square fitting algorithm; and outputting a stratum apparent resistivity inversion result. The method is based on geosteering, the advantages of three geophysical prospecting methods of earthquake, logging and electromagnetism are fully fused and played, the multiplicity of electromagnetic inversion solutions is reduced, the inversion depth and accuracy are improved, and powerful guarantee is provided for subsequent section interpretation, well position deployment, fluid identification and other operations. The invention also provides a device for realizing the electromagnetic inversion method based on well electric shock joint modeling.

The invention discloses a microwave device multi-physics field optimization method taking electromagnetism as a center based on a feature assistance and proxy model. The method comprises the steps of setting initial values of geometric design variables and multi-physics field design variables; the multi-physical field response with electromagnetism as the core responds at the solution point {xg, xm}, multiple pieces of parallel multi-physical field data are generated, and f represents the frequency; according to the multi-physics field data, constructing a feature-assisted multi-physics field agent model based on a neural network transfer function, and calculating a gradient optimization derivative of the feature-assisted multi-physics field agent model; and on the basis of the gradient optimization derivative and the optimization feature auxiliary multi-physics field agent model, obtaining an optimal solution of the variable. According to the method, the robustness and optimization design efficiency of a microwave device multi-physics field optimization algorithm taking electromagnetism as a core are improved.

The invention discloses a dynamic joint simulation method for a satellite electromagnetic docking process, and belongs to the field of spacecraft electromagnetic docking dynamics simulation, and the simulation method comprises the following steps: firstly, carrying out the three-dimensional modeling of a spacecraft containing an electromagnet in Ansys Maxwell, and building a spacecraft dynamics simulation model in Syslab; setting simulation boundary conditions and initial conditions; joint simulation is carried out, and a closed-loop dynamic information transmission process of interaction of electromagnetism and dynamics is established; analyzing the motion process of the current step in Syslab in a stepping manner according to the simulation information of the previous step; at the moment, an external control system is allowed to detect and control the electromagnet current; and finally, repeating the joint simulation process, dynamically updating the motion state of the spacecraft until the motion state is stopped, and realizing electromagnetic field and motion process coupled electromagnetic docking dynamics simulation. According to the method, the defect that dynamic simulation of electromagnetic field and motion coupling cannot be solved through traditional electromagnetic simulation can be overcome, and the method better fits the physical actual process of on-orbit docking of spacecrafts.

The invention relates to the technical field of electromagnetic field shielding detection, and discloses a shielding effect detection method under an impact electromagnetic field, which comprises the following steps: setting an impact electromagnetic field simulation environment, placing a shielding shell for electromagnetic shielding in the simulated impact electromagnetic field simulation environment, placing the shielding shell in the simulation environment, and carrying out electromagnetic shielding on the shielding shell; the electromagnetic detector receiving impact electromagnetism is opened, the shielding shell sleeves the outer side of the electromagnetic detector, and the output port of the electromagnetic wave generator device simulating impact electromagnetic waves is aligned to the two sides of the shielding shell. According to the shielding effect detection method under the impact electromagnetic field, a simulation environment of the impact electromagnetic field is set, then in the simulation environment, a simulation electromagnetic generator is arranged, electromagnetic impact is carried out on a shielding shell through electromagnetic generation, then electromagnetic interference data are detected through an electromagnetic detector in the shielding shell, and the shielding effect of the shielding shell is measured. The process is simple and efficient without dismounting equipment, so that the shielding effect detection of the lightning arrester impact electromagnetic field is more convenient and efficient.

The present disclosure provides systems and methods for detecting and mapping a subsurface object. The system includes a set of transmitters configured to emit a primary electromagnetic field, a set of receivers spatially separated from the transmitter and configured to detect a secondary magnetic field generated by the subsurface object in response to the primary electromagnetic field, and a processor operably connected to the transmitter and the receivers. The processor is configured to control the transmitter to generate the primary electromagnetic field, generate a data signal based on the secondary magnetic field detected by the receivers, and analyze the data signal to determine characteristics of the subsurface object based on the processed signal.

The invention discloses a pyrolytic particle detection device, which relates to the technical field of fire detection and comprises an air pump, a heating cavity, a conducting electromagnetic valve, a refrigeration cavity, a laser detection cavity, an exhaust electromagnetic valve, a weak photoelectric pulse signal processing unit, a comprehensive control and data processing unit and an RS485 communication unit. The sucking pump, the heating cavity, the conduction electromagnetic valve, the refrigeration cavity, the laser detection cavity and the exhaust electromagnetic valve are sequentially connected through 8 mm silica gel air pipes to form a complete air path system; the invention provides a pyrolytic particle detection device which can accurately detect pyrolytic particles in air in real time, can digitally display the content of the detected pyrolytic particles, can avoid interference of environmental factors such as dust, water mist, strong light and electromagnetism, and provides an effective detection device for extremely early warning of a fire hazard. And sufficient favorable time for several hours is provided to control combustion conditions, so that event expansion is avoided.

The invention discloses a deep geological anomalous body identification method based on transient electromagnetic and muon detection, which comprises the following steps of: respectively carrying out transient electromagnetic detection and muon detection on a region needing to be detected, and processing data obtained by the transient electromagnetic detection to obtain resistivity distribution data of the region needing to be detected; meanwhile, processing data obtained by muon detection to obtain density distribution data of the area needing to be detected; joint inversion is carried out on the data of the two physical properties through a cross gradient algorithm based on discrete smooth interpolation constraint, and the advantage of a cross gradient function does not depend on a relational expression between the physical properties, but inversion is carried out through the similarity of the underground structure; the discrete smooth interpolation algorithm performs smooth constraint on the inversion result of the cross gradient function, so that the influence of local oscillation and noise can be suppressed to a certain extent, the precision of the final inversion result is higher, and accurate identification of density anomaly and resistivity anomaly in the area needing to be detected is realized.

The invention relates to the technical field of electromagnetism and magnetic material loss prediction, in particular to a magnetic core loss prediction method based on an empirical state space model, which combines magnetic flux density (Bt) and magnetic field intensity (Ht) with temperature and frequency as key physical variables and incorporates the key physical variables into a neural network model. According to the method, the input feature space of the model is widened, the cross coupling effect between variables is considered in a larger range, the model can show high predictive capacity under different materials and working conditions, and the applicability in various environments is improved; aiming at various physical effects possibly existing in the magnetic material loss process, a plurality of parallel neural network modules are designed by introducing multi-state attribute constraints and considering mutual coupling and constraint effects of the multi-state attribute constraints, so that the superimposed effect of magnetic core loss is simulated, and the limitation of a traditional single formula model is broken through; and the complex change rule of the magnetic core loss is reflected more comprehensively, so that the expression capability of the model under various working conditions is effectively improved.

The utility model discloses an electromagnetic pulse air pressure spray water gun, which relates to the technical field of fire extinguishing devices and comprises an electromagnetic pulse spray water gun body, an internal structure and an external structure, the internal structure is fixedly connected inside the electromagnetic pulse spray water gun body, and the external structure is fixedly connected outside the electromagnetic pulse spray water gun body. The reciprocating piston slides on the surface of the connecting guide rod at a high speed under the action of magnetic force of the transmitting coil, the reciprocating piston moves to push out a fire extinguishing agent in the water storage chamber from an opening shaped like a Chinese character'mi 'in the surface of the rubber front baffle for extinguishing fire, and the electromagnetic pulse spraying water gun body takes electromagnetism as a power source which is much better than high-pressure gas; the electromagnetic pulse spraying water gun is lighter than a pulse air pressure spraying water gun, the electromagnetic pulse spraying water gun body is more convenient and flexible in maneuverability, a standby power supply is much lighter than a standby air cylinder, and the size is much smaller.

The application provides a method for calculating interface polarization charge and current distribution based on reflection coefficient, and relates to the technical field of computational electromagnetics. The method comprises the following steps: establishing a reflection coefficient-dielectric parameter mapping, directly correlating the reflection characteristics of electromagnetic waves with the intrinsic parameters of the medium through a reflection coefficient formula, and laying a physical foundation for polarization analysis; interface electromagnetic field reconstruction, using boundary conditions and constitutive relations to determine the electric field distribution on both sides of the interface and the corresponding polarization intensity. The distribution rule of the electromagnetic field in the medium is determined, the macroscopic electric field is converted into the spatial description of the polarization intensity, and an intermediate variable is provided for charge and current calculation; polarization dynamic response quantification, through the spatial and temporal derivatives of the polarization intensity, the interface polarization charge density and the polarization current density are derived. The theoretical model is converted into actual physical quantities, and the dynamic response mechanism of charges and currents when electromagnetic waves interact with the medium is revealed.

The invention relates to the technical field of electromagnetism, in particular to a multi-layer slab waveguide mode processing method, device, equipment, medium and program, and the method comprises the steps: constructing a transfer matrix model of a multi-layer slab waveguide; obtaining boundary conditions of the infinite space, and determining a corresponding real number domain characteristic equation and a complex number domain characteristic equation according to the transfer matrix model and the boundary conditions so as to determine a guided mode and a leakage mode of the multilayer slab waveguide in the infinite space; introducing a perfect matching layer to convert a radiation condition of an infinite space into an absorption boundary in a finite computational domain, constructing a finite space characteristic equation according to the thicknesses of the perfect matching layer and the absorption boundary, and positioning a plurality of correction leakage modes according to the finite space characteristic equation to generate a Bereger mode; and generating complete mode distribution according to the guided mode, the leakage mode and the Bereger mode. Therefore, the problems of relatively poor calculation precision, relatively slow calculation speed, limitation of complete mode solving in the multilayer slab waveguide and the like in related technologies are solved.

Various Freight left hand rules (motor rules), right hand rules (engine rules), Ampere rules 1, Ampere rules 2 (right hand spiral rules), Lorentz forces, Ampere forces and the like exist in the fields of electrotechnics, electromagnetics, optics and the like and are used for judging current, magnetic fields and acting force directions. And memory disorder of students and technicians is easily caused. The electronic magnetic pole and the spinning direction (figure 1 in the specification) are marked by using an electronic spinning right-hand rule expression method, and all the rules and forces can be replaced and unified. And three breakthrough discoveries are caused: (1) an electron magnetic pole and a spinning direction rule are caused; and (2) the electromagnetic field is the expansion, static and retraction type expression of the electronic ring. And (3) the expansion type electronic ring has the characteristics of electromagnetic wave (including light wave) particles, fluctuation, electromagnetism, quantum and the like, and solves the optical hundred-year competition problem. And more electronic equipment and products can be developed according to the'electron spin right hand rule '.

The utility model relates to an electromagnetic field fresh-keeping cabinet, which belongs to the field of fresh-keeping cabinets and comprises a refrigerating box. The mounting assembly is arranged on the upper surface of the refrigeration box in a communicating manner; the electromagnetic mechanism is arranged on the inner side of the mounting assembly; the loading assembly is detachably arranged on the inner side of the mounting assembly and comprises a loading box which is detachably arranged on the inner side of the mounting assembly; the two connecting plates are respectively arranged on the left side and the right side of the charging box; and the two handles are respectively arranged on the upper surfaces of the two connecting plates. According to the electromagnetic field fresh-keeping cabinet, electromagnetism in the fresh-keeping cabinet can be monitored through the arranged electromagnetic mechanism, so that the use safety of the electromagnetic field fresh-keeping cabinet is guaranteed, meanwhile, under the action of the loading assembly, meat food can be rapidly taken out of the mounting box, and therefore workers can rapidly clean the interior of the mounting box; and under the action of a shielding plate, electromagnetism can be blocked, so that the use safety of the electromagnetic field fresh-keeping cabinet is improved.

The application discloses a magnetic moment comparator device and a measuring method. The magnetic moment of a current-carrying standard coil is proportional to the magnetic field generated at a fixed distance on the axis, and according to the principle of equivalence between the magnetic dipole layer and the current-carrying coil in electromagnetism, the magnetic moment of the magnetic sample at the same position can be measured by the current-carrying standard coil when the spatial magnetic field can be accurately measured. The application designs a magnetic moment comparator in a magnetic shielding cylinder, uses an atomic magnetometer to measure the absolute magnetic field with high sensitivity, places a current-carrying standard coil at a distance r0 on one side of the atomic chamber along the background magnetic field direction, and the axis is parallel to the background magnetic field direction; the magnetic moment direction of the magnetic sample is parallel to the background magnetic field direction, when the magnetic sample is moved to the position of the atomic chamber at a distance r0 on the other side of the atomic chamber by a sample transmission rod, the current flowing into the standard coil is changed in real time under the condition that the background magnetic field remains unchanged, and then the magnetic moment of the magnetic sample is equal in size and opposite in direction to the magnetic moment of the current-carrying standard coil.

The anti-magnetic cable comprises a cable core, the side surface of the cable core is fixedly connected with an insulating layer, the side surface of the insulating layer is fixedly connected with an anti-magnetic layer, and the side surface of the anti-magnetic layer is fixedly connected with an outer sheath; the side surface of the magnetic ring is fixedly connected with a connecting rod, the side surface of the connecting rod is in threaded connection with an extension rod, the end, away from the connecting rod, of the extension rod is rotationally connected with a rotating block, the inner side face of the rotating block is in threaded connection with a threaded rod, and one end of the threaded rod is fixedly connected with a connecting block. Through the components, the antimagnetic layer can be used for isolating electromagnetism, converting electromagnetic radiation into heat and improving the anti-interference effect, the insulating layer with good heat insulation performance is used for protecting the internal cable core, the heat generated by the antimagnetic layer is effectively isolated, the influence on the cable core is avoided, the magnetic ring can be used for inhibiting electromagnetic interference, and the anti-interference effect is improved. And the extendable extension rod is arranged between the two groups of magnetic rings, so that a certain distance is kept between the cables, and mutual interference is prevented.

The invention discloses a low-frequency interference magnetic field elimination method and system, and belongs to the technical field of electromagnetism and control. The device mainly comprises a magnetic sensor module used for collecting interference magnetic field signals, a conversion circuit module used for converting the interference magnetic field signals into analog voltage signals, a characteristic frequency band interference signal selection module, an analog signal phase adjustment module, a multi-path characteristic frequency band interference signal addition module, an output gain adjustable module and a power amplification module. A magnetic field generation module and an elimination effect detection feedback module. According to the low-frequency interference magnetic field elimination system, an analog circuit design method is adopted, low-frequency interference magnetic fields of several different frequency bands can be effectively weakened and eliminated, and the low-frequency interference resistance of devices with high low-frequency interference sensitivity such as ultralow-field magnetic resonance imaging equipment can be improved by adjusting system related parameters; and the equipment availability is enhanced.

The utility model discloses a magnetoresistive sensor with a conductive slip ring and a measurement experiment instrument of a geomagnetic field, which comprises a fixed working plate with an angle, a limiting ring is fixed on the lower wall surface of the working plate, a locking nut is arranged on the limiting ring, a fastening jackscrew is arranged on the locking nut, a ring groove is arranged on the working plate, and the conductive slip ring is arranged in the ring groove. A ring groove is formed in the working plate, a rotating steel ball is installed in the ring groove, a coil rotating table is installed in the working plate, and the coil rotating table is in lap joint with the rotating steel ball. A magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring a geomagnetic field are suitable for one of experimental instruments for measuring a weak magnetic field in an electromagnetic physical experiment of higher hospital science, and a precise angle measuring device of the instrument adopts the conductive slip ring, so that the instrument can rotate by 360 degrees without hindrance during angle measurement, and a measuring wire is not cut off; and the measurement is more convenient.

A light speed engine is composed of a CD driver room, a coil and a conductor. The upper part of the CD-ROM room is in a vault shape, the lower half part of the CD-ROM room is vertical, and the bottom cover is in a totally-closed waterproof shape and is used for storing and outputting light wave driving force; the coil generates a magnetic field through current and outputs light wave driving force; the conductor can be a coil or a magnet and the like for mutual conversion of electromagnetism and light waves. When in use, a movement of a required engine is additionally arranged in the CD-ROM drive chamber, then the movement is connected to the external power switch through the CD-ROM drive chamber, and the engine can be started by turning on the power switch.

The utility model discloses a miniaturized high isolation degree coupler relates to the field of coupler, including the casing and the magnetic core, the lateral wall of casing adopts recessed structure to set up, the magnetic core sets up at the recessed position department of casing's lateral wall, the lateral wall of casing and be located the recessed position department is equipped with the protection isolation cover that will the magnetic core block, the protection isolation cover includes the upper cover body and lower cover body of magnetic adsorption setting, the inside of upper cover body and the inside of lower cover body all are equipped with the shielding layer. The utility model discloses have high isolation degree structure, avoid the interference that the outside world's electromagnetism causes to the magnetic core, avoid signal crosstalk and the phenomenon of error code simultaneously, thereby make the coupler can be accurately detected, in addition, have good heat conduction performance, improve the stability of coupler use.

The invention relates to the cross technical field of computational electromagnetism and precision permanent magnet device design, in particular to a method for improving the nonuniformity of a magnetic disk space magnetic field, and aims to solve the problems that a method for improving the uniformity of a magnetic field in the prior art is low in optimization efficiency and difficult to break through the uniformity bottleneck caused by angular harmonic waves and a structural coupling effect. According to the scheme, the method comprises the steps that an accurate finite element model containing seven circles of fan-shaped magnets, a parallel magnetic disk, an eddy current disk and an iron support is established in Opera3D, and meshing and solving are carried out; in the first stage, the structural height of the iron stand is optimized through parameterized scanning, and the optimal height parameter is determined; and in the second stage, on the basis of the optimal iron stand height, the outermost two circles of the magnetic disk are set as NdFeB. The non-uniformity deviation (delta B) of the magnetic field of the target spherical area can be reduced by 13%, and the method is suitable for high-precision scenes such as nuclear magnetic resonance and synchrotron radiation light sources and has the advantages of being efficient in design and high in repeatability.

The invention discloses a nano-molecular device magnetic response modeling method and system based on machine learning, and relates to the technical field of electromagnetis.The system comprises an electromagnetic response testing module, an electromagnetic response modeling module and a parameter adjusting module; the electromagnetic response test module is used for detecting the current and voltage oscillation frequency between a reference magnetic layer and a free magnetic layer of the nano oscillator and detecting the external magnetic field intensity of the nano oscillator; the electromagnetic response modeling module is used for predicting the precession frequency deviation state of a free magnetic layer under current regulation by using a machine learning method, and predicting the voltage oscillation frequency change of the nano oscillator when the external magnetic field intensity changes; the parameter adjusting module is used for adjusting direct current spin polarization current and external magnetic field intensity, the electromagnetic response test module comprises a conductive electrode, a current detection unit, a voltage detection unit and a spectrum analysis module, and the device has the advantage of being efficient in adjustment.

The invention belongs to the technical field of electromagnetism experiment teaching instruments, and particularly relates to a demonstration experiment device and method for verifying the Biot-Savart law. The device is reasonable in design, the geomagnetic field serves as a reference magnetic field, indirect measurement of the magnetic induction intensity around the current-carrying wire is achieved by measuring the deflection angle of the magnetic needle under the action of the current-carrying wire according to the vector superposition principle of the magnetic field, a traditional measurement mode depending on a Hall sensor or a fluxmeter is replaced, and the measurement accuracy is improved. A measurement basis is provided for a verification experiment of the Biot-Savart law; the device is structurally composed of an angle positioning bottom plate, a current-carrying wire assembly and a magnetic needle measuring assembly, the relative magnetic induction intensity is obtained through visual angle reading, and data calculation is achieved in combination with the magnetic field vector superposition relation. By measuring the relationship between the magnetic induction intensity on the symmetry axis of the current-carrying bent conductor and the vertical distance, the current magnitude and the bending angle, experimental verification demonstration of the Biot-Savart law is realized.