779 results about "Electromagnetic coupling" patented technology

The invention belongs to the technical field of antenna engineering, and particularly relates to an ultra-wide-band low-profile phased-array antenna, which realizes broadband impedance matching characteristics and effectively expands the working bandwidth of the antenna by optimizing a dipole arm structure and introducing a matching branch knot and linear tapered slot composite structure on a radiation unit layer; on the array architecture level, an electromagnetic metasurface technology is adopted, array current distribution is improved through a periodic artificial electromagnetic structure, the active standing-wave ratio is remarkably reduced, the scanning angle of an array is widened, and meanwhile high compression of a system profile is achieved; on the structural design level, a three-dimensional composite structure of a transverse metal floor, a longitudinal radiation layer and a transverse metasurface layer is innovatively constructed, and the overall section height is reduced to 0.137 lambda Low (lambda Low is the lowest working frequency wavelength) through electromagnetic coupling and space folding technologies; in conclusion, the ultra wide band (the relative bandwidth is greater than or equal to 90%) and the low profile (lt; and the method is suitable for a new generation of broadband phased array radar system.

An electronic device may be provided with peripheral conductive housing structures, a rear wall, a first antenna, and a second antenna. The first antenna may have a resonating element formed from the peripheral conductive housing structures. The second antenna may have a folded antenna element overlapping the first antenna. The folded element may be disposed on at least three sides of a substrate. The folded element may follow a meandering path along at least two of the sides. A first end of the folded element may be coupled to a positive feed terminal. A second end of the folded element may be shorted to a conductive chassis. The folded element may exhibit minimum peak current magnitude at a surface of the substrate facing the rear wall, minimizing electromagnetic coupling between the first and second antennas and optimizing a radiation pattern of the second antenna through the rear wall.

The invention relates to the technical field of quantum sensing and ocean detection, and discloses an ocean magnetic field sensor based on an NV color center and an ocean magnetic field measuring method.The sensor comprises a cylindrical pressure-resistant cabin, an optical platform arranged in the pressure-resistant cabin and a main control panel; a laser, a beam shaping unit, a dichroscope, a beam shaping lens group, an objective lens, a diamond NV color center chip, a plano-convex lens I, a band-pass filter and a photoelectric detector are mounted on the optical platform; two microstrip loop antennas are mounted on the outer side of the diamond NV color center chip; an FPGA + ARM dual-core processor, a digital lock-in amplifier and two microwave signal generators are installed on the main control board, and the microwave signal generators are connected with the microstrip loop antenna and achieve electromagnetic coupling with the diamond NV color center chip. The invention has the advantages of high sensitivity, good long-term stability and strong anti-interference capability, and provides a new generation of quantum sensing solution for applications such as ocean geomagnetic monitoring and underwater target identification.

The invention relates to the technical field of fault testing, in particular to a dry-type air-core reactor turn-to-turn short circuit monitoring method based on a magnetic field difference method. According to the method, regularization constraint is introduced in an initial baseline stage to construct a reference electromagnetic coupling matrix, a heat accumulation index is recursively analyzed based on three-phase current energy, a thermally-induced magnetic field drift model is fitted in combination with magnetic field residual errors, and combined with combined constraint of the reference electromagnetic coupling matrix and the thermal drift model, a three-phase electromagnetic coupling model is established. The normal thermally induced magnetic field drift component is dynamically stripped in real-time monitoring; and under the constraint of a reference electromagnetic coupling matrix, fitting and optimizing a current vector through weighted least square state estimation, and integrating magnetic field and current two-dimensional deviation to obtain a structure consistency deviation index for fault monitoring. According to the invention, monitoring is carried out in consideration of a linear electromagnetic transfer rule and nonlinear thermal drift compensation, a complex magnetic field environment and a variable load operation condition of the dry-type air-core reactor are adapted, and continuous and reliable monitoring guarantee is provided for long-term stable operation of equipment.

The invention relates to an aluminum pipe local conduction regulation and control method, system and device based on dynamic electromagnetic field modulation and a medium, and the method comprises the steps: driving an electromagnetic coupling array to scan a target conduction region of an aluminum pipe, so as to construct a three-dimensional dynamic electromagnetic model; analyzing and generating a multi-band excitation parameter combination in a bandwidth constraint range according to the target conductivity gradient parameter; the method comprises the following steps: driving an electromagnetic coupling array by a multi-band excitation parameter combination, collecting an electromagnetic response spectrum of a target conductive area in real time, extracting an eddy current characteristic component set, calculating an obtained phase compensation amount, and dynamically adjusting an excitation phase difference and a power ratio of the electromagnetic coupling array to form a controllable standing wave interference field; and solving the Lyapunov function gradient difference between the node distribution characteristics of the standing wave interference field and the predicted value of the three-dimensional dynamic electromagnetic model so as to iteratively update the multi-band excitation parameter combination. According to the invention, high-precision dynamic regulation and control of the conductivity gradient of the aluminum tube are realized, the energy consumption is effectively reduced, and the stability of a standing wave interference field is enhanced.

The invention discloses a low-voltage switch cabinet intelligent monitoring system and method based on the Internet of Things, particularly relates to the technical field of power equipment state monitoring, and is used for solving the problem of monitoring data distortion caused by accumulated damage of a sensor due to arc electromagnetic pulses in the prior art. A current and voltage waveform is collected and an arc event is identified; calculating an electromagnetic coupling weight coefficient according to the arc position and the sensor coordinate; capturing working parameters of the sensor, comparing the working parameters with historical reference values, and calculating offset of key parameters; information entropy mutation of the offset of the same type of sensor groups is analyzed, and a nonlinear damage mark is triggered; based on the offset and the damage mark, establishing a segmentation mapping relation and outputting an accumulated damage evaluation value; correcting monitoring data according to the evaluation value and inputting the monitoring data into a fault diagnosis model to execute early warning; quantitative evaluation and data self-correction of the hidden damage of the sensor are realized, and the accuracy of fault early warning is guaranteed from the source.

The invention discloses a transformer monitoring method and system based on a multi-dimensional signal, and relates to the technical field of transformer monitoring, and the method comprises the steps: obtaining the multi-dimensional signal and working condition parameters of a transformer, carrying out the time domain feature extraction of the multi-dimensional signal, obtaining a corresponding time domain correlation feature, carrying out the frequency domain feature extraction of the multi-dimensional signal, obtaining a corresponding frequency domain correlation feature, and carrying out the time domain feature extraction of the multi-dimensional signal; fault analysis is carried out according to the working condition parameters and the frequency domain correlation characteristics, and a corresponding initial fault detection result and an electromagnetic coupling residual value are obtained; and if so, carrying out fuzzy evaluation on the time domain correlation feature, the frequency domain correlation feature, the electromagnetic coupling residual value and the multi-dimensional signal based on a pre-trained fault detection model to obtain a corresponding fault monitoring result. The technical problems that a traditional transformer monitoring method mainly depends on electrical signal analysis, but key parameters such as oil temperature are not included in a monitoring system, so that potential fault hidden dangers cannot be found in time, and the operation reliability of the transformer is reduced are solved.

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention discloses an electromagnet electromagnetic ultrasonic thickness measurement method and system based on an anti-collision unmanned aerial vehicle, and relates to the field of nondestructive testing, and the method comprises the steps: obtaining the coordinates of a preset detection point, controlling the flight path of the unmanned aerial vehicle, and determining the safety position information of the unmanned aerial vehicle located near the preset detection point; the motion of the multi-degree-of-freedom mechanical arm is controlled through a servo motor and an encoder, contact impact is reduced through a buffer mechanism, and attitude information of the electromagnetic ultrasonic sensor unit aligned with the surface of the to-be-detected object is determined; the magnetic attraction force is adjusted in real time through a closed-loop feedback system, and a linear frequency modulation pulse is adopted as an excitation signal to obtain an echo signal containing acoustic-electromagnetic coupling interference; acoustic-electromagnetic coupling interference is corrected and processed in an auxiliary mode through a multi-mode signal separation algorithm and machine learning, and final thickness data is obtained; and transmitting the final thickness data to a cloud platform, and providing a data visualization interface and an alarm function on the cloud platform. According to the invention, accurate thickness detection and remote monitoring of a complex structure material can be realized.

The invention provides an active circuit electromagnetic response characteristic modeling analysis method and related equipment, and relates to the technical field of integrated circuits. According to the method, the to-be-analyzed active circuit is divided into the circuit component units mainly relating to nonlinear characteristic changes and the circuit carrier plate mainly relating to linear characteristics and only comprising unit connection wiring, and based on circuit component S parameter actual measurement operation in any strong field environment, complex nonlinear modeling errors are avoided, and the system reliability is improved. Meanwhile, on the basis of wiring S parameter simulation operation in a corresponding strong field environment, the high-frequency electromagnetic coupling effect of circuit connection wiring is accurately captured, the circuit modeling calculation amount is reduced, and then through cascading fusion analysis operation on wiring simulation S parameters and assembly actual measurement S parameters, the wiring simulation S parameters and the assembly actual measurement S parameters are analyzed; the rapid collaborative analysis of the wiring electromagnetic coupling response and the component nonlinear behavior is realized, so that the real electromagnetic response characteristic condition of the specified active circuit in the corresponding strong field environment can be rapidly and accurately reproduced, and the rapid iterative optimization effect of the active circuit design can be conveniently realized.

The invention relates to the technical field of thermoelectric magnetic field numerical simulation, in particular to a numerical simulation method for liquid metal flow heat transfer under thermal electromagnetic multi-field coupling. The method comprises the following steps: acquiring metal structure physical parameters and thermal electromagnetic multi-field coupling simulation control parameters of metal to be tested; based on the metal structure physical parameters and the thermal electromagnetic multi-field coupling simulation control parameters, liquid metal thermal electromagnetic multi-field reaction numerical simulation and verification are carried out, and liquid metal thermal electromagnetic multi-field reaction verification data are generated; setting single-factor working condition simulation control parameters; and carrying out working condition simulation liquid metal flow heat transfer global characteristic analysis on the liquid metal thermoelectromagnetic multi-field reaction verification data based on the single-factor working condition simulation control parameters so as to establish a liquid metal thermoelectromagnetic flow heat transfer global characteristic model. According to the invention, comprehensive and accurate analysis of flowing and heat transfer of the liquid metal in the closed cavity under the thermal electromagnetic coupling effect by various factors is realized.

The multi-directional controllable suspension system comprises a linear electromagnetic vibration reduction assembly and an arc-surface electromagnetic vibration reduction assembly, when the multi-directional controllable suspension system is used, when a vehicle frame at the lower end vibrates vertically, a first guide rod moves in the axial direction of an outer cylinder, and a cylindrical electromagnetic coupling unit fixed to the first guide rod moves between an outer permanent magnet array and an inner permanent magnet array; when the vehicle body inclines laterally or twists, the outer cylinder rotates around the hinged point of the outer cylinder and the lower end vehicle frame, the cambered surface electromagnetic coupling unit is driven to deflect between the upper permanent magnet array and the lower permanent magnet array, the gradient magnetic field is cut to generate resistance moment, and vibration is reduced. The first elastic piece and the second elastic piece provide elastic restoring force for the upper permanent magnet array and the lower permanent magnet array correspondingly to cooperatively inhibit side inclination and torsion, so that multi-dimensional vibration reduction in the horizontal direction is achieved, and the dynamic stability of the vehicle is improved.

The invention relates to a medium wave transmitter fault prediction and adaptive operation and maintenance method based on artificial intelligence, and the method comprises the steps: constructing an electromagnetic coupling topological graph through analyzing a circuit board design file, and quantifying a fault propagation path between power amplifier modules; fault current signals are collected in real time, and risk quantitative indexes are generated in combination with topological characteristics; modeling and predicting a cascading risk probability based on the graph structure; dynamically adjusting a radio frequency power path and a carrier frequency according to a topological position evaluation result; and utilizing an execution feedback closed loop to optimize the prediction model. The method solves the problems that a traditional scheme cannot quantify an electromagnetic coupling propagation path, prediction and hardware control are separated, and a dynamic optimization mechanism is lacked, achieves accurate blocking of a fault propagation path and adaptive evolution of a prediction model, and remarkably improves the operation stability and fault response efficiency of a medium-wave transmitter.

The invention provides an electromagnetic coupling intelligent street lamp unmanned aerial vehicle self-adaptive charging position optimization method, and relates to the field of unmanned aerial vehicle charging, and the method comprises the steps: obtaining the position of a street lamp and the electric quantity information of an unmanned aerial vehicle, constructing a spiral detection grid, collecting electromagnetic field data, and generating a field intensity distribution diagram; selecting a maximum field intensity area to set a pose combination, and evaluating a ratio of charging efficiency to hovering power consumption; determining an optimal pose and planning an energy consumption optimal path; and controlling the unmanned aerial vehicle to adjust the deviation in real time to establish charging connection. The charging efficiency of the unmanned aerial vehicle in the electromagnetic coupling environment is improved, and the endurance time is prolonged.

The invention belongs to the technical field of automobiles, and particularly relates to an electronic mechanical braking system self-adaptive clamping force control method considering friction hindrance. Comprising the steps that 1, a proportional-integral theory is adopted to design a clamping force closed-loop controller and a fuzzy self-adaptive control parameter adjusting method of the electronic mechanical braking system, and proportional parameters and integral parameters of the clamping force closed-loop built-in controller are dynamically adjusted; secondly, feedforward compensation control based on friction estimation is designed through a third-order expansion state observer, and dynamic estimation is conducted on nonlinear friction obstruction of the electronic mechanical braking system; and step 3, the permanent magnet synchronous motor servo control comprehensively applies excitation axis zero control setting, double-axis compensation constraint and a proportional-integral algorithm to realize position closed-loop and current closed-loop controller design. According to the invention, the problems of remarkable nonlinear stiffness characteristic, nonlinear friction obstruction, electromagnetic coupling of the excitation shaft and the torque shaft of the permanent magnet synchronous motor and the like in the working process of an electronic mechanical braking system are effectively solved.

The invention discloses an industrial multi-protocol communication gateway adaptive adaptation method and system, and relates to the technical field of industrial communication, and the method comprises the following steps: deploying a communication performance collection engine and a physical environment collection engine on a system in parallel, capturing a key performance index KPIs in real time, capturing a physical layer signal reflecting an electromagnetic activity state in a case, and transmitting the physical layer signal to a server; generating a real-time data stream with a timestamp; according to the method, a communication performance acquisition engine and a physical environment acquisition engine are deployed in parallel, key performance indexes KPIs are acquired, physical layer signals are captured, and a multi-dimensional associated communication-electromagnetic combined baseline model is established to sense the dynamic electromagnetic environment in the baseline model; a hidden fault of inter-symbol interference (ISI) caused by internal electromagnetic coupling can be accurately identified and quantified, a communication logic error and a physical layer electromagnetic phenomenon are accurately associated on a timeline, and accurate positioning of an interference source is realized.

The invention provides a wireless bladder volume monitoring system based on inductive coupling. The wireless bladder volume monitoring system is composed of a passive LC sensor unit tightly attached to the bladder, an external reading coil integrated on clothes or a belt, and a portable impedance measuring unit arranged in a pocket of the clothes. According to the system, the high penetrability of low and medium frequency scanning signals is utilized, wireless monitoring of the in-vivo bladder state is achieved through electromagnetic coupling between the passive LC sensor unit and the external reading coil, and the influence of relative pose changes between the passive LC sensor unit and the external reading coil on the measurement result can be effectively overcome. According to the bladder volume wireless passive real-time monitoring system, the system resonant frequency of the passive LC resonant unit is obtained by continuously detecting the impedance of the input end of the external reading coil, and then the bladder volume wireless passive real-time monitoring system easy to wear is achieved, has the advantages of being simple in structure, high in reliability and portable and is suitable for long-term monitoring scenes.

The invention discloses a terahertz metasurface capable of realizing independent control of amplitude and phase. The terahertz metasurface comprises a terahertz transparent substrate; the metasurface unit array is periodically arranged in a first direction, and each metasurface unit comprises a first structural layer which is of a dielectric resonance structure and is used for providing a phase regulation and control function; the second structural layer is a thin film formed by an adjustable absorption material and is used for providing an amplitude regulation and control function; the second structure layer is provided with an independent electrode for adjusting the transmission amplitude; a first dielectric isolation layer is arranged between the terahertz transparent substrate and the first structure layer and is used for reducing an electromagnetic coupling effect; the first structural layer and the second structural layer are stacked in the vertical direction through a three-dimensional processing technology, a second dielectric isolation layer is arranged between the first structural layer and the second structural layer, and the second dielectric isolation layer is a silicon dioxide SiO2 or silicon nitride Si3N4 film with the thickness D ranging from 100nm to 1000nm.

The invention discloses a power supply modular design method and system, and relates to the technical field of computer-aided process design, and the method comprises the steps: receiving power supply design parameters, carrying out the feature coding through a three-layer neural network, generating an initial design vector, and constructing an SNN decision rule base according to the initial design vector; performing parameter evolution on the SNN decision rule base through a pulse frequency mapping function and a dynamic current adjustment function to generate a collaborative decision packet, and injecting a noise suppression factor into the collaborative decision packet to generate a noise immune decision packet; and constructing an electromagnetic field distribution model, inputting the noise immune decision packet into the electromagnetic field distribution model to calculate the electromagnetic coupling strength of the pulse signal, and comparing the electromagnetic coupling strength with a preset strength threshold to generate an electromagnetic isolation enhancement decision packet. According to the invention, through neural network feature coding and a full-closed-loop parameter transmission mechanism, lossless conversion and dynamic response from power supply design parameters to manufacturing instructions can be realized.

The invention provides a direct heating type reconfigurable intelligent metasurface based on a phase change material and a preparation method thereof, the metasurface is composed of a plurality of metasurface units arranged in an array mode, and each metasurface unit comprises a substrate, a first dielectric layer, a middle metal layer, a second dielectric layer and a phase change material layer which are sequentially arranged from bottom to top; the two sides of the phase change material layer are respectively provided with a metal patch of a metal radiation patch structure. A contact electrode is arranged in the substrate; the first dielectric layer and the second dielectric layer are insulating layers, a first vertical through hole and a second vertical through hole are further formed in the metasurface unit, the metal patch radiation structure and a contact electrode of the substrate form an electrical path flow through the first vertical through hole and the second vertical through hole, and the current flows through the phase change material layer to drive the phase change material to generate crystalline state / amorphous state conversion. And an equivalent conductive path, electromagnetic coupling strength or local impedance between the metal patch radiation structures is changed in different phase states.

The invention discloses a magnesium-based solid hydrogen storage tank integrated with a resistance heating and electromagnetic coupling magnetic field structure, which comprises a tank body and a control cabinet integrated on the outer side wall of the tank body, a plurality of electrode plates are arranged in the tank body, and the electrode plates are electrically connected with a power supply cabinet on the side wall of the tank body through tabs on the electrode plates. The inner space of the tank body is divided into a plurality of hydrogen storage spaces by the plurality of electrode plates, magnesium-based solid hydrogen storage materials containing magnetic alloy metal and carbon materials are added into the hydrogen storage spaces through material adding ports formed in the outer side wall of the tank body, a temperature sensor is arranged in each hydrogen storage space, and a pressure sensor is arranged at the top of the tank body; a hydrogen inlet / outlet is formed in the top end of the tank body; a communicating hole for communicating two adjacent hydrogen storage spaces is formed in the center of the electrode plate. Through the synergistic effect of an electric field and a magnetic field, the thermal management performance of the magnesium-based hydrogen storage material is effectively improved, the hydrogen desorption cold start time is shortened, the thermal effect influence in the hydrogen charging and desorption process is reduced, stress concentration caused by volume expansion is relieved, and the hydrogen storage and release performance of the magnesium-based material is improved.

The invention relates to a cast-rolling casting nozzle with an electric-magnetic coupling oscillation effect. Relates to a cast-rolling casting nozzle with an electromagnetic oscillation effect, which is matched with a horizontal double-roller cast-rolling machine in the field of aluminum alloy die casting. The method is used for solving the inevitable internal macrosegregation defect of the high-alloy-content aluminum alloy cast-rolled product. The device comprises an L-shaped electrode pair 1; a side seal 2; an excitation device 3; a guide plate 4; a cooling water pipe (inlet / outlet) 5; a copper enameled wire (excitation) 6; a countersunk self-tapping screw 7; a casting nozzle upper plate 8; a rhombic shunting block 9; a nozzle lower plate 10; and a casting nozzle bottom plate 11. In the casting and rolling process, an oscillating electric field and a steady magnetic field are introduced, electromagnetic coupling force is generated at the outlet end of a casting nozzle, the electromagnetic force effectively stirs a semi-solid aluminum alloy melt, and therefore the purposes that alloy is evenly distributed, and segregation defects are reduced or even eliminated are achieved. The method is used in 4-series, 6-series and 7-series aluminum alloys, and the effect is obvious.

The invention relates to the field of force-electromagnetic coupling measurement, and discloses a low-voltage electric energy metering box internal arrangement method and system based on a modular mutual inductor plugging structure, and the method comprises the steps: synchronously collecting three-phase module magnetic flux density, base strain field and pre-tightening force time sequence data through deploying a multi-source sensor; a directed weighted hypergraph is constructed to represent a magnetoelastic coupling topology, the topology is converted into a time-varying creep rate matrix through a viscoelastic creep memory operator, a compensation strategy is generated in combination with phase space division and a magnetostriction response tree, and finally an optimization scheme of module spacing and interface rigidity is reversely mapped. By accurately capturing the time-varying mechanical law of the strain field and the pre-tightening force, the problem of time-varying coupling drift of the modular mutual inductor caused by structure-electromagnetic coupling and viscoelastic memory effect is solved, the limitation of traditional static independent calibration is broken through, and long-term stability of three-phase metering precision is achieved.

The invention provides a flywheel energy storage system with an electromagnetic coupler, which comprises a motor, a flywheel rotor, the electromagnetic coupler, a frequency converter and a generator, and is characterized in that the motor is connected with the flywheel rotor to drive the flywheel rotor to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, and the outer rotor sleeves the inner rotor and is spaced from the inner rotor; the flywheel rotor is in transmission connection with the inner rotor, the inner rotor generates a rotating magnetic field to drive the outer rotor to rotate, and the frequency converter is connected with the outer rotor to change the current frequency of the outer rotor so as to change the magnetic field rotating speed matched with the current, so that the mechanical rotating speed of the outer rotor is kept constant. The generator generates power, accesses the power grid and inputs electric energy with stable frequency into the power grid, the requirement of power transmission to the power grid is met, power electronic devices are not needed, rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, and the capacity of the power grid for efficiently accepting new energy is improved.

The invention relates to the technical field of ultra-high-speed motor design, fluid mechanical engineering and electromagnetic-structure coupling, in particular to an innovative structure-electromagnetic coupling design of a centrifugal hydrogen circulating pump driven by an ultra-high-speed permanent magnet motor. The integrated coupling rotor system is formed by rigidly connecting a permanent magnet motor rotor and a centrifugal impeller through conical surface interference and key groove positioning, a rotor iron core is formed by laminating 0.2 mm ultrathin silicon steel sheets (35W250), and impeller blade molded lines are optimized based on electromagnetic force harmonic characteristics (the number of blades is equal to the number of motor poles + / -1); the coupling matching degree is remarkably improved: through structure-electromagnetic parameter collaborative optimization, the comprehensive efficiency of the system reaches 85% or above, and is improved by 12%-15% compared with that of a separation design; an anti-resonance damping module is combined with a frequency avoidance design, and the vibration acceleration in an ultra-high-speed interval is smaller than or equal to 8 g and is reduced by 60% or above compared with a traditional design; the torque-load matching time is less than or equal to 0.3 s when the flow is suddenly changed, overcurrent impact or surge is avoided, and the dynamic requirement of a fuel cell system is met.

The invention belongs to the technical field of driving system simulation, and provides a hybrid vehicle driving assembly NVH simulation method and system and application, and the method comprises the steps: building a transmission system model, a structure-electromagnetic coupling model and a suspension system model; coupling the transmission system model and the structure-electromagnetic coupling model, constructing a rigid-flexible coupling model, and constructing a motor simulation model; electromagnetic excitation output by the motor simulation model is imported into a rigid-flexible coupling model, and the rigid-flexible coupling model integrates electromagnetic excitation and mechanical excitation to serve as an input excitation source of the suspension system model; and the suspension system model receives the vibration response from the rigid-flexible coupling model to obtain a drive assembly NVH simulation result, and corrects and optimizes the rigid-flexible coupling model in combination with a rack test result to complete hybrid vehicle drive assembly NVH simulation. According to the method, the high requirement of NVH development of the hybrid power system can be met, and the problem that an existing simulation model does not conform to the reality is solved.

The invention discloses an array-type UWPT system, and the system comprises an energy inversion module which comprises a DC power supply and a full-bridge inversion circuit, and the DC power supply is connected with the input end of the full-bridge inversion circuit through a wire, and provides energy for the inversion process of the system; the resonance compensation network comprises a transmitting / receiving side compensation capacitor, and the transmitting / receiving side compensation capacitor comprises a transmitting side compensation capacitor Ctx and a transmitting side compensation capacitor Crx; the reconfigurable coupling mechanism comprises n transmitting coil groups Ltx and m receiving coil groups Lrx; the energy receiving module comprises a bridge rectifier circuit and a load RL; the direct-current power supply is connected with the full-bridge inverter circuit in series, the full-bridge inverter circuit is connected with the transmitting / receiving side compensation capacitor, and the transmitting side compensation capacitor Ctx and the transmitting coil assembly Ltx are connected in series and then connected to the output end of the full-bridge inverter circuit to form an LC series resonance circuit. The n transmitting coil groups and the m receiving coil groups perform energy transmission through electromagnetic coupling, and the receiving coil groups generate high-frequency alternating current after sensing magnetic field changes of the transmitting coils and are connected to the input end of the bridge rectifier circuit through wires.

The invention provides a low-profile circularly polarized antenna unit for slot coupling feed and an array thereof, and the antenna unit employs a plurality of metal layers which are coaxially arranged, are sequentially stacked up and down and are separated through dielectric layers, thereby achieving the high integration of a feed network, a coupling structure and a radiation unit in the vertical direction of the antenna unit. Specifically, the parasitic patch and the radiation patch which are stacked and coupled up and down are adopted, so that the working bandwidth of the antenna unit is expanded; furthermore, the interference of a feed network on the radiation performance of the antenna is reduced through the separation of the upper metal ground and the lower metal ground, and meanwhile, two orthogonally distributed gap structures formed in the upper metal ground are matched with the microstrip transmission line to perform coupling feed, so that the circular polarization performance of the antenna unit is improved; in addition, periodically arranged metallized shielding through holes are formed in the edges of the antenna units, so that surface wave propagation and electromagnetic coupling between the units are effectively inhibited, and the performance stability of the antenna unit during large-angle scanning is improved while the low-profile characteristic of the antenna unit is ensured.

The invention relates to the technical field of transformers, in particular to a signal transformer for multi-path signal coupling of a low-voltage power grid, the signal transformer comprises a magnetic core, an inlet wire winding and an outlet wire winding, efficient electromagnetic coupling and isolation of multi-path signals are achieved through the magnetic core, and a main control chip can send control signals to equipment through a driver and a coupling winding. And receiving an equipment feedback signal. The system can extract characteristics of a control signal and a feedback signal in real time, dynamically calculate a comprehensive crosstalk index, and adaptively adjust parameters of a receiving filter and a driver according to the comprehensive crosstalk index, so that signal crosstalk caused by physical coupling among multiple channels is effectively inhibited. According to the scheme, the structure is simplified, the system cost is reduced, the communication quality and the anti-interference capability of multiple paths of signals in a low-voltage power grid are remarkably improved, and the system is suitable for multiple occasions such as high-reliability power line communication.

The invention discloses a digital power grid power line anti-theft alarm system, which relates to the technical field of electric power safety protection and comprises a coupling feature extraction module, an interference mode analysis module, a cross-modal feature fusion module, a time sequence calibration regulation and control module and a closed-loop dynamic suppression module, the method comprises the following steps: constructing a time-frequency phase-locked observation baseline of a continuous sampling signal, inverting coupling spectrum characteristics of a monitoring link and a communication link by using multi-channel phase reconstruction processing, generating a phase and amplitude residual fingerprint map, and calibrating a sudden change threshold domain as a dynamic reference of topology identification. Through technologies of phase reconstruction, causal replay, multi-modal fusion, time calibration and the like, electromagnetic coupling disturbance is accurately identified and suppressed, effective distinguishing between disturbance and intrusion signals is realized, a closed-loop steady-state control mechanism is constructed, and the accuracy, intelligence and robustness of power grid protection are improved.