1629 results about "Electromagnetic compatibility" patented technology

The invention discloses a semiconductor packaging device electromagnetic compatibility comprehensive test method and system, and belongs to the technical field of electromagnetic compatibility testing. The method comprises the following steps: collecting structure parameters, packaging topology and predefined function states of a to-be-tested packaging device, and constructing a polymorphic working model; establishing a disturbance injection control model according to each state and configuring disturbance source parameters; implementing dynamic disturbance injection and acquiring response data in a real working state of the device; performing time domain and frequency domain conjoint analysis on the response data, constructing an electromagnetic response dynamic feature sequence, inputting the electromagnetic response dynamic feature sequence into a machine learning model, extracting multi-dimensional coupling features and predicting tolerance; calculating performance indexes such as an interference tolerance score and a coupling strength index based on model output indexes, comparing the performance indexes with a standard, and evaluating a compatible risk level in a full state; the method realizes quantitative evaluation of the EMC performance of the packaging device with high reduction degree and multi-state coverage, and has the advantages of comprehensive test, accurate prediction, explainable attribution and the like.

The invention provides an electromagnetic compatibility test method and system for PCB design, a PCB comprises a schematic circuit diagram and a structural model, and the method comprises the following steps: extracting high-frequency signal characteristics in the schematic circuit diagram to obtain an electromagnetic simulation parameter set; performing multi-physical field coupling modeling according to the electromagnetic simulation parameter set and the structure model to obtain an electromagnetic field-circuit model; performing frequency-time domain hybrid excitation loading on the electromagnetic field-circuit model to obtain an electromagnetic noise distribution diagram; performing gradient descent optimization on layout parameters of the structure model according to the electromagnetic noise distribution diagram to obtain an anti-interference layout scheme; and performing multi-working-condition Monte Carlo simulation and residual error calibration on the anti-interference layout scheme to generate a correction guidance library.

The invention relates to the technical field of automatic detection data processing, in particular to a cooling fan automatic detection cleaning system which comprises an electromagnetic compatibility strengthening sensing module, a multi-physical field feature decoupling module, a layered fault diagnosis module, a dynamic cleaning strategy generation module, an anti-corona cleaning execution module and a closed loop feedback optimization module. Temperature field distribution, mechanical vibration signals and partial discharge characteristics are collected in real time through a distributed sensing network and are subjected to tensor fusion with SVG operation parameters to generate a multi-physical field joint characteristic space, and a closed-loop feedback module associates cleaning efficiency data with fault characteristics, reversely corrects model parameters and optimizes a cleaning strategy. According to the invention, traditional threshold limitation is broken through, and closed-loop control of electromagnetic interference suppression, unknown fault dynamic diagnosis and cleaning accurate response is realized.

The invention relates to the technical field of intelligent power grid communication, and discloses an HPLC communication-oriented power topology adaptive reconstruction and energy consumption optimization control method, which comprises the following steps of: acquiring HPLC communication characteristic data of power network nodes in real time; constructing a dynamic spatio-temporal topological graph based on the communication feature data and predicting a future topological state; generating a communication power distribution and routing path joint optimization strategy by using a multi-target reinforcement learning algorithm in combination with the predicted future topology state and the real-time energy consumption parameter; verifying the electromagnetic compatibility and protocol compliance of the optimization strategy through a digital twin model, and generating a control instruction which can be executed by equipment; and the transmitting power and the communication route of the HPLC node are dynamically adjusted through the control instruction. According to the method, the communication quality stability and the energy efficiency level are improved, topology dynamic perception, multi-target collaborative optimization and strategy security verification are realized, and efficient and reliable operation of HPLC communication in a complex power grid environment is guaranteed.

The invention discloses a metasurface array antenna housing, belongs to the technical field of electromagnetic wave regulation and control, and solves the problem of how to improve the transmittance and absorptivity of a metasurface to electromagnetic waves. Electromagnetic waves with different frequencies resonate on the first metasurface wave-absorbing layer and the second metasurface wave-absorbing layer respectively, so that the electromagnetic waves are absorbed by the lumped resistor. And the metasurface wave-transmitting layer re-radiates electromagnetic waves of a communication frequency band to enable the electromagnetic waves to penetrate through the metasurface unit, and meanwhile, the surface of the metasurface wave-transmitting layer can serve as a metal floor of the first metasurface wave-absorbing layer and the second metasurface wave-absorbing layer due to copper coating. The antenna can be widely used in the scenes of radar stealth, communication antenna integration, electromagnetic compatibility, wireless energy transmission and the like, and has a good application prospect.

The invention relates to a 5G communication antenna electromagnetic compatibility enhancement method, device and equipment, and belongs to the technical field of wireless communication networks, and the method comprises the steps: collecting frequency band-space electromagnetic intensity data in real time through a distributed sensor network, and constructing a three-dimensional mapping model in combination with base station beam parameters and polarization information; interference frequency band coordinates are screened based on the model, a phase gradient compensation value is calculated by using a polarization mismatch degree, an antenna array is driven to reconstruct a radiation pattern, and polarization orthogonal nulling is formed in an interference area; the port standing-wave ratio is synchronously monitored, closed-loop optimization is triggered, the antenna weight and the polarization direction are dynamically adjusted until indexes converge, and the problems of insufficient dynamic interference suppression precision, polarization mismatch compensation lag and the like in the prior art are solved.

The invention relates to a satellite cabin load layout optimization method based on a quantum algorithm, and the method comprises the following steps: listing a mathematical expression form of an optimization target and a limiting condition according to a satellite cabin load layout requirement, and generating a constraint optimization problem model; wherein the optimization target and the limiting condition at least comprise a satellite quality characteristic requirement, a space geometric compatibility requirement, a thermal control requirement, an electromagnetic compatibility requirement, an installation and maintenance requirement and an installation position requirement of special instrument equipment; converting the layout constraint optimization problem mathematical model into an optimization objective function in a secondary unconstrained binary optimization form; solving the optimization objective function by using a quantum optimization algorithm to obtain an optimization vector; and calculating the load position and attitude of the satellite cabin by optimizing the vector, and carrying out inversion to obtain a final satellite cabin load layout scheme. According to the method, the non-deterministic polynomial problem of satellite cabin load layout optimization can be solved in an accelerated manner by utilizing the characteristics of superposition, entanglement, interference and the like of quantum bits, and a new technical approach is provided for improving the design efficiency of a satellite cabin load layout optimization scheme.

The invention discloses an ordered charging management and control terminal and method for a charging robot, and relates to the technical field of robot charging management and control, and the method comprises the following steps: S1, installing an electric power data collection device at each power distribution branch, synchronously collecting voltage and current waveform data in real time, uploading the data to a central control system, generating a harmonic time domain database, and carrying out the real-time collection of the data; the method is used for reflecting power disturbance states. By constructing a distributed synchronous acquisition architecture and a harmonic time domain database, comprehensive perception and accurate identification of electric energy disturbance are realized, and a self-adaptive closed-loop control mechanism is established in combination with phase decoupling, reverse compensation and power evolution prediction, so that harmonic superposition and system resonance are effectively suppressed. According to the method, the electromagnetic compatibility and the system reliability of cooperative operation of the multiple charging robots are improved, and the equipment aging and operation and maintenance risks are reduced.

The invention relates to a direct current motor with an anti-electromagnetic interference structure in the field of motors, which is characterized in that the surfaces of a commutator and an electric brush are blown in real time through a magnetic shielding cylinder arranged on the outer side of the commutator and an air blowing blade arranged in the magnetic shielding cylinder, and carbon powder on the surfaces of the commutator and the electric brush is cleaned; the commutator and the electric brush are subjected to synchronous blowing heat dissipation, so that the commutator and the electric brush have relatively good contact stability, the condition of contact resistance increase caused by carbon powder accumulation is reduced, the probability of arc generation between the commutator and the electric brush is reduced, and the electromagnetic compatibility of the motor is further improved; the influence of a high-frequency magnetic field generated by the arc on a rotor winding coil is reduced, and electromagnetic interference is further reduced; in addition, the insulating groove formed in the commutator improves the collecting and cleaning effects of the carbon powder, and the insulating groove is matched with the diversion disc to realize ejection of the lower contact surface of the electric brush, so that the cleaning effect of the carbon powder is further improved.

The invention belongs to the technical field of electromagnetic wave absorption, and particularly discloses a three-dimensional structure wave-absorbing metamaterial which comprises a first three-dimensional structure layer, a second three-dimensional structure layer and a metal backboard which are sequentially arranged from top to bottom, the first three-dimensional structure layer comprises a first top layer and a first three-dimensional absorption enhancing framework arranged on the lower surface of the first top layer, and the second three-dimensional structure layer comprises a second top layer and a second three-dimensional absorption enhancing framework arranged on the lower surface of the second top layer. A first high-impedance metasurface and a second high-impedance metasurface are loaded on the lower surface of the first three-dimensional absorption enhancement skeleton at intervals; the second three-dimensional structure layer comprises a second top layer and a second three-dimensional absorption enhancement skeleton arranged on the lower surface of the second top layer, and a third high-impedance metasurface is loaded on the top surface of the second top layer. By adopting the three-dimensional structure wave-absorbing metamaterial, ultra-wideband absorption and large-angle stability can be achieved under the condition that the thickness is small, light and thin wideband application of a wave-absorbing body is facilitated, and the three-dimensional structure wave-absorbing metamaterial has great practical value in the field of electromagnetic compatibility.

The invention provides an electromagnetic compatibility design method and device based on a vehicle-mounted audio system. The method comprises the following steps: determining a target level of electromagnetic compatibility; performing risk assessment on the device in the drawing to obtain a risk assessment result; selecting clock frequency points of signal radiation from the devices meeting the design requirements; performing simulation verification on the vehicle-mounted audio system, and judging whether the vehicle-mounted audio system reaches a target level or not; if not, optimization design is carried out; if yes, carrying out near-field testing on the whole machine; judging whether the near-field test reaches a target level or not; if not, optimization design is carried out; if yes, performing a far-field test on the whole machine; judging whether the far-field test reaches a target level or not; if not, optimization design is carried out; if yes, ending; through simulation optimization, it is ensured that the electromagnetic compatibility of the whole machine design can reach an expected target level, and therefore the quality and reliability of products are remarkably improved; the research and development period can be shortened, and the research and development cost is reduced.

The invention relates to the technical field of lightning current measurement, in particular to a wireless measurement method for a high tower wave impedance real-model test. According to the technical scheme, the method comprises the steps that a three-dimensional model with the size proportion of 1: 1 to an actual tower is established in simulation software based on structural parameters of the actual tower, and the model is segmented; and applying a standard lightning current signal to the tower top of the three-dimensional model in simulation to obtain a simulation voltage value of each section of tower. A traditional potential line is replaced by the wireless measurement module, coupling interference is eliminated, and the wave impedance measurement precision is remarkably improved; the trigger voltage is pre-judged by adopting sectional type wireless networking and simulation, so that field wiring is simplified, and the test period is shortened; the system is suitable for high-rise towers of different heights and structures, stable data transmission in a complex environment is ensured in combination with a wireless transmission system deployed in a layered mode, meanwhile, the electrical characteristics of the towers under transient lightning current are accurately captured, and a reliable basis is provided for lightning protection design and electromagnetic compatibility optimization.

The invention discloses an intelligent wiring optimization method and system for an HDI circuit board, and relates to the technical field of electronic circuit optimizing.According to the intelligent wiring optimization method and system for the HDI circuit board, by arranging an electromagnetic compatibility monitoring module and a thermal management evaluation module, the electromagnetic interference index Em and the thermal aggregation index Thc of the HDI circuit board are monitored in real time and evaluated; an optimization early warning signal is triggered and a thermal management optimization suggestion is generated, so that the problems of electromagnetic interference and insufficient heat dissipation are accurately solved; by calculating and evaluating a comprehensive optimization index COP, the electromagnetic shielding and heat distribution balancing capability is improved; and finally, by calculating and evaluating an optimization performance evaluation coefficient OPE, a dynamic adjustment module adjusts wiring parameters and optimizes a path in real time, iterative optimization is performed in combination with a real-time feedback mechanism, and finally a wiring scheme meeting requirements is output, so that the problems of low automation degree and poor optimization effect of an existing system are solved, and the system is suitable for popularization and application. And the requirement of wearable equipment on high performance of the HDI circuit board is met.

The invention relates to the technical field of electromagnetic compatibility testing, in particular to an electromagnetic compatibility testing device and method for the shaft current of a hub motor, and the device comprises a shielding chamber, a system master controller, a dynamometer, a hub motor tool and a testing system. A dynamometer, a hub motor tool and a test system are arranged in the shielding chamber; the hub motor tool is used for installing and fixing a hub motor to be tested. An output shaft is designed at the rotor end of the hub motor, and the hub motor is connected with the dynamometer through the output shaft. The test system is used for measuring the shaft current of the hub motor; the system master controller is used for controlling the wheel hub motor to operate under various working conditions and collecting shaft current under each working condition; and obtaining an electromagnetic compatibility test result according to the shaft current. The electromagnetic compatibility and reliability of the hub motor and the control system thereof can be improved.

The invention is suitable for the technical field of hovercar control, and provides a thermal-vibration-weight collaborative optimization method of a high-power-density hovercar controller, and the method comprises the steps: constructing a three-dimensional housing structure based on fractal mechanics, achieving 35-45% of weight reduction through bionic design, and remarkably reducing the weight while guaranteeing the structural strength; thermal management, electromagnetic compatibility and vibration suppression collaborative optimization layout is established, a high-heating-power module is arranged near a heat dissipation air opening, and a sensitive control unit is arranged in a center damping area of a shell; a gradient material distribution scheme is adopted, a high-heat-conduction composite material is configured in a high-heat-flow area, and a high-damping material is adopted in a vibration sensitive area. Under the high-power working condition, the heat dissipation performance of the controller is improved, vibration transmission is reduced, the overall weight is reduced, and high-reliability control hardware support is provided for the hovercar.

The invention discloses a phase-adjustable large-current generator, and the generator comprises a main circuit module, and a topological structure of the main circuit module employs a multi-stage IGBT inverter; the phase control module inputs a power grid voltage signal through a voltage transformer, adopts an SOGI-PLL structure to improve signal tracking precision, and combines a virtual synchronous machine technology to enhance system balance and a self-adaptive control strategy to dynamically adjust an output signal so as to realize phase control and synchronization; the electromagnetic compatibility optimization module adopts a layered shielding design and is combined with an optical fiber to transmit a control signal, so that the electromagnetic compatibility of equipment is improved; a relay protection test integration module, wherein the relay protection test integration module comprises a differential protection test mode and a distance protection test mode; according to the invention, the problems of low phase adjustment precision, poor synchronization stability and insufficient electromagnetic compatibility of a large current generator in a new energy grid-connected environment are solved.

The invention provides a substation cable trench inspection robot adaptive networking system and method. The system comprises a channel quality monitoring module, a multi-band communication module, a dynamic topology reconstruction module, an electromagnetic compatibility optimization module, a novel antenna array module, a data storage and management module and a man-machine interaction module which are in communication connection with one another. The channel quality monitoring module is used for providing real-time communication environment perception for the system; the multi-band communication module is used for carrying out adaptive cooperative communication through multiple bands; the dynamic topology reconstruction module is used for optimizing a routing table in real time; the electromagnetic compatibility optimization module is used for optimizing the strong electromagnetic interference resistance of the system; the novel antenna array module is used for monitoring geometrical characteristics and material attributes of the metal wall of the cable trench and dynamically adjusting the transmitting angle and polarization mode of an antenna; the data storage and management module is used for recording a running log through a distributed database; the man-machine interaction module is used for providing an operation interface and an interaction interface.

The invention relates to the technical field of electromagnetic compatibility testing, and provides a current-based magnetic field radiation emission limit value cutting method and device and electronic equipment. Comprising the steps of obtaining working current parameters of tested equipment; determining a basic limit value of magnetic field radiation emission, obtaining a working current of the tested equipment when the magnetic field radiation is the basic limit value, and taking the working current as a reference current threshold value; when the working current parameter is greater than the reference current threshold value, calculating the clipping amount of the magnetic field radiation emission limit value based on the ratio of the working current parameter to the reference current threshold value; and cutting the basic limit value according to the cutting amount to obtain the magnetic field radiation emission limit value of the tested equipment. The limit value is compatible with the existing electromagnetic compatibility national military standard magnetic field radiation emission limit value, so that the electromagnetic compatibility test assessment of the large-current equipment can be evaluated more reasonably and accurately, and the method has high engineering application value.

The invention discloses a simulation analysis method and system based on an electromagnetic compatibility test, and relates to the field of electromagnetic compatibility testing, and the method comprises the steps: building a hardware three-dimensional simulation model for a hardware environment with electromagnetic compatibility to be tested, and obtaining hardware environment data; establishing a multi-device heat balance model, and dynamically adjusting temperature values and distances between the plurality of components and between the component groups; based on FDTD and MoM algorithms, the electromagnetic compatibility of the hardware environment data is analyzed; establishing an electromagnetic compatibility dynamic adjustment model, and dynamically optimizing the stability of to-be-tested electromagnetic compatibility hardware configuration and software analysis; and optimizing and adjusting the electromagnetic compatibility dynamic adjustment model in combination with actual design feedback. The method has the advantages that through multi-physics field coupling simulation and dynamic feedback optimization, collaborative design of hardware layout, heat balance and electromagnetic compatibility is achieved, the compliance rate of an electromagnetic compatibility test is remarkably improved, and the research and development cost is reduced.

The invention discloses an electromagnetic emission test method of an intelligent household electrical appliance, which simulates a dynamic interaction process by controlling multiple modules to run simultaneously according to a preset logic, and comprises the following steps: acquiring electromagnetic signals in real time and performing frequency domain conversion to obtain frequency spectrum distribution; identifying a target frequency band which generates energy convergence due to non-linear superposition and peak intensity of the target frequency band; obtaining a superposition waveform sequence and classifying a nonlinear superposition mode; identifying an abnormal interference mode by combining the peak intensity and a mode classification result; associating the abnormal frequency band with the module operation log, and analyzing an interaction time sequence and logic to determine a cause; a filtering or regulation strategy is applied based on the cause, whether the peak value is reduced is verified and a report is generated. According to the invention, through energy convergence frequency band identification, non-linear superposition mode classification, interference cause tracing, directional regulation and closed-loop verification, accurate diagnosis and root positioning of hidden transient interference are realized, so that the test depth is improved, the rectification efficiency is optimized, and the predictability of product electromagnetic compatibility design is enhanced.

The invention provides an electrocardiograph electromagnetic compatibility test data diagnosis method based on an intelligent sensor, and relates to the technical field of electrocardiograph electromagnetic compatibility test. The method includes generating structured test data. And calculating a theoretical interference reference threshold. And generating an initial interference judgment atlas arranged according to the interference time sequence. And constructing a dynamic compensation coefficient matrix, and injecting the dynamic compensation coefficient matrix into the initial interference determination map to obtain a dynamic interference determination map. And calculating the characteristic similarity between the real-time test data in each interference time sequence window and the dynamic interference judgment map, and diagnosing the electromagnetic compatibility state of the electrocardiograph. According to the invention, through multi-dimensional data acquisition and interference identification, through a dynamic reference threshold and a compensation mechanism, environment and equipment state changes are adapted, the diagnosis stability of a complex scene is improved, through real-time data comparison and traceability, the equipment state is rapidly judged, the interference source is positioned, the debugging time is shortened, and finally the measurement accuracy of the electrocardiograph is guaranteed.

The embodiment of the invention discloses electronic equipment, a composite board and a preparation method thereof, and relates to the field of board structures. The conductive performance of the composite board is improved. According to the specific scheme, the composite board comprises a composite layer, a carbon fiber yarn layer, a conductive layer and a floor. The composite layer is provided with a groove structure; the carbon fiber yarn layer is embedded in the composite layer, and part of the carbon fiber yarn layer is located in the groove structure. The conductive layer and the composite layer are stacked, and the conductive layer covers at least part of the groove structure and is electrically connected with the carbon fiber yarn layer. One side of the conductive layer away from the composite layer is electrically connected with the floor. And the conductive layer is electrically conducted with the carbon fiber yarn layer. And the carbon fiber yarn layer embedded in the composite layer is electrically connected with the floor through the arrangement of the groove structure and the conductive layer. Therefore, charges in the whole carbon fiber yarn layer can flow to the floor through the conductive layer. And the whole carbon fiber yarn layer has an electromagnetic compatibility protection effect. When the composite board is applied to the electronic equipment, the electromagnetic compatibility protection performance of the electronic equipment can be improved.

The invention discloses a multi-band electromagnetic compatibility evaluation method and system in a combat scene, and the method comprises the steps: calculating the spectrum occupancy probability distribution of an enemy through constructing a spectrum occupancy probability model in a non-cooperative confrontation environment; establishing a multi-band electromagnetic compatibility matrix, and calculating an optimal spectrum allocation scheme by applying a dynamic spectrum allocation algorithm; calculating the overall electromagnetic compatibility of the system based on the compatibility score of the equipment and the frequency band and the frequency spectrum occupation risk of the enemy; according to the electromagnetic environment change threshold value, the spectrum occupancy probability model is updated regularly, and dynamic evaluation of the multi-band electromagnetic compatibility is achieved; according to the invention, under the condition of non-cooperative spectrum sharing, mutual interference between our equipment and enemy spectrum occupation risks are comprehensively considered, real-time dynamic evaluation of electromagnetic compatibility in a combat scene is realized, and effective support is provided for battlefield spectrum resource management and command decision.

The invention relates to the technical field of electromagnetic compatibility and signal processing, and discloses a multi-dimensional feature fusion-based electromagnetic leakage signal classification and identification method, which comprises the following steps of: preprocessing an original electromagnetic signal to obtain standardized data, extracting time domain, frequency domain and space domain features to construct a nine-dimensional feature vector, and extracting a three-dimensional feature vector; constructing an initial feature library and completing the initial feature library through a self-supervision verification mechanism, training the initial feature library through a CNN-LSTM fusion model with an attention mechanism to obtain a classification model, classifying signals to be identified, starting a self-supervision reinforcement learning mechanism optimization model according to an F1 score, and dynamically optimizing the feature library each month; the method solves the defects of the traditional technology, improves the recognition accuracy and the system adaptability, and can be used for cable information safety leakage protection.

The invention belongs to the field of flexible direct-current transmission power module tests, and discloses a multi-dimensional electromagnetic compatibility test system and method for a flexible direct-current transmission power module, and the method is characterized in that a dynamic power grid simulation unit simulates the electrical stress of the power module under a complex working condition by reproducing power grid limit faults such as direct-current short circuit and alternating-current harmonic waves; the broadband interference injection unit is used for superposing multi-band electromagnetic interference to simulate a composite interference scene according to the noise characteristics of the IGBT / IGCT switching process; the multi-physical field monitoring unit synchronously acquires key parameters such as electromagnetic field intensity, signal transmission, temperature rise and vibration, and analyzes module response under the action of multiple stress coupling in real time. According to the system, cooperative loading of power grid faults and noise is realized, limitation of a single interference source and a simple scene in a traditional test is broken through based on multi-physics field data fusion analysis, and the comprehensive evaluation precision of the anti-interference capability, the operation reliability and the safety of the power module in an extreme electromagnetic environment is improved.

The invention provides an electromagnetic compatibility test system for an integrated circuit, a part or a whole vehicle. The system comprises an interference signal injection or receiving device, a test board, an oscilloscope, an upper computer, a power supply and an isolation communication device, the interference signal injection or receiving device is used for sending a quantitative interference signal to the test board or receiving and measuring the size of the interference signal of the test board; the test board is used for bearing a tested integrated circuit and carrying out an electromagnetic compatibility test according to a working state specified by the upper computer; the isolation communication device is used for performing photoelectric conversion on a control signal and a monitoring signal corresponding to the electromagnetic compatibility test to form photoelectric isolation; the oscilloscope is used for measuring the waveform of the monitoring signal; and the upper computer is used for controlling the test process and analyzing the monitoring signal to judge the test result. The isolation communication device is used for cutting off electrical connection between the test board and the upper computer and the oscilloscope, it is ensured that the test board is not affected by the outside in the electromagnetic compatibility test process, and the accuracy of the electromagnetic compatibility test is improved.

The invention relates to a filtering connector, in particular to a high-speed and low-speed signal mixed-loading filtering connector, which comprises a shell, a plate-type capacitor is arranged in the shell, and a plurality of capacitor hole positions are distributed on the plate-type capacitor; an insulating sleeve penetrates through a part of the capacitor hole positions, and a high-speed contact piece penetrates through the insulating sleeve; an elastic piece penetrates through the other part of capacitor holes, a low-speed contact piece penetrates through the elastic piece, and a grounding spring is arranged between the plate-type capacitor and the inner wall of the shell, so that filter conduction of the low-speed contact piece, the plate-type capacitor and the shell is realized; and insulating structures are arranged in the inner cavity of the shell on two sides of the plate-type capacitor. For the condition that signals transmitted by the connector comprise high-speed signals, low-speed signals and power signals and the number of cores is large, the low-speed signals and the power signals are filtered, and the high-speed signals are subjected to stray capacitance reduction processing, so that equipment using the connector can pass an electromagnetic compatibility test, and the high-speed signals are normally transmitted.

The invention relates to the technical field of electromagnetic compatibility, in particular to a new energy automobile electronic part EMC (Electro Magnetic Compatibility) multi-dimensional simulation verification method, which comprises the following steps of: based on a geometric structure and material attributes of a new energy automobile electronic part, identifying an abnormal field intensity region, extracting a signal path and an electromagnetic wave incident direction, and analyzing an overlapping relationship between the signal path and the electromagnetic wave incident direction; according to the method, the electromagnetic field distribution and the interference source of the parts are accurately modeled and analyzed, the shielding and filtering design is optimized, the electromagnetic compatibility is improved, the interference coupling point is identified, the shielding effectiveness and the filtering effect are evaluated, the optimization policy is identified, the electromagnetic field distribution after optimization is analyzed, the fluctuation data of the external electromagnetic field is captured, and the influence evaluation list of the external electromagnetic field is generated. The reliability of the design under actual working conditions is ensured, electromagnetic interference is prevented, stable work of parts in a variable electromagnetic environment is ensured, the electromagnetic compatibility of the whole automobile is improved, the influence of electromagnetic interference on the functions of the new energy automobile is reduced, the design effect is optimized, and the performance and safety are improved.

The invention discloses a high-performance ship cable and a preparation process thereof, relates to the technical field of cables, and aims to solve the problem that an existing cable is insufficient in environmental adaptability, safety, electromagnetic compatibility and the like, the cable comprises a conductor, an insulating layer, a longitudinal waterproof structure, a shielding layer and a sheath layer from inside to outside, the conductor is of a multi-strand soft copper wire stranded structure, and the copper content of the multi-strand soft copper wire stranded structure is larger than or equal to 99.95%; the DC resistance at 20 DEG C is less than or equal to 0.01724 omega mm / m; the insulating layer is made of cross-linked polyethylene or polytetrafluoroethylene and can resist 1.5 times of rated voltage for 1 minute without breakdown; the longitudinal waterproof structure comprises a water-blocking tape and water-blocking paste; the shielding layer is of a double-layer structure, and the shielding effectiveness is larger than or equal to 60 dB The sheath layer is made of a low-smoke halogen-free flame-retardant material and contains an antioxidant and an ultraviolet light absorber, the preparation process comprises six steps of conductor preparation, insulating layer forming and the like, parameters are accurately controlled, the cable can work at the temperature of-40 DEG C to 85 DEG C, is salt-fog-resistant, waterproof and flame-retardant, is adaptive to the complex environment of ships and warships, and the operation reliability and safety are improved.

A door assembly provides EMC shielding to provide EMI / RFI protection. The door assembly has an EMC door frame, an EMC door, and EMC seals for maintaining a circuit between the door frame, the floor (e.g., threshold, flooring, etc.), and / or the door. The door assembly may also utilize one or more EMC elements (e.g., EMC tape, paint, adhesive, coatings, caulk, etc.) that may be used to create the circuits between the components of the door assembly and / or with other components of the building (e.g., between the door frame and the wall). The EMC shielding is used to reduce (e.g., limit, block, etc.) the levels of electrogenic interference (EMI) / radio frequency interference (RFI) radiation that is able to pass by the shielding. Moreover, the door assembly also provides improve additional door assembly performance (e.g., sound, weather, air flow, heat, cold, or the like abatement, energy harvesting, or other performance benefits).