CN112632823A - Simulation method and device for predicting electromagnetic radiation - Google Patents
Simulation method and device for predicting electromagnetic radiation Download PDFInfo
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- 230000005670 electromagnetic radiation Effects 0.000 title claims abstract description 45
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Abstract
The invention discloses a simulation method and a simulation device for predicting electromagnetic radiation, wherein the simulation method comprises the following steps: establishing an initial simulation model for predicting electromagnetic radiation, wherein the simulation model comprises component models of a PCB (printed Circuit Board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and determining the appearance and the spatial distance of each component model; defining the material attribute of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model; based on the final simulation model, defining a frequency domain power source at the connecting point of the power supply and the cable, defining an antenna model port to receive a load, and integrating an electric field on a port connecting line at the position receiving the load; carrying out mesh division on the final simulation model according to finite element computational electromagnetism; and simulating to obtain a voltage result of the antenna model port. The invention considers the influence of the test antenna on the test result, constructs the simulation application of which the simulation is more fit with the actual test condition, and leads the simulation result to be more accurate.
Description
Technical Field
The invention relates to the technical field of electromagnetic radiation simulation, in particular to a simulation method and device for predicting electromagnetic radiation.
Background
With electrification of more and more products, the problem of electromagnetic compatibility is increasingly serious and becomes a more and more important problem, and in the early stage of product development of parts working depending on electromagnetic characteristics, in order to save development cost, the electromagnetic characteristics of products are controlled before the products are processed, so that related repeated iteration cost is reduced, simulation technology is also increasingly emphasized, and electromagnetic radiation emission simulation is one of common simulation projects.
The problem that test and simulation result prediction deviation are big is mainly met in present electromagnetic radiation emission simulation, and under most circumstances, only trend prediction can be done, but simulation and test ration comparison need be more accurate, and the radiation emergence performance of study object body has only been considered in traditional electromagnetic compatibility simulation, only models the body and simulates, and test condition and simulation content have certain difference and lead to simulation and test result magnitude deviation.
Disclosure of Invention
The invention aims to provide a simulation method and a simulation device for predicting electromagnetic radiation, which consider the influence of a test antenna on a test result and construct simulation application of simulation which is more fit with the actual test working condition, so that the simulation and the test result are more accurate.
In order to achieve the above object, an embodiment of the present invention provides a simulation method for predicting electromagnetic radiation, including:
establishing an initial simulation model for predicting electromagnetic radiation, wherein the initial simulation model comprises component models of a PCB (printed Circuit Board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and determining the appearance and the spatial distance of each component model;
defining the material property of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
based on the final simulation model, defining a frequency domain power source at the connecting point of the power supply and the cable, defining a port of the antenna model to accept a load, and integrating an electric field on a port connecting line at the position of accepting the load;
carrying out mesh division on the final simulation model according to finite element computational electromagnetism;
and simulating to obtain a voltage value result of the antenna model port.
In one embodiment, the antenna model is connected with an external signal receiving port of a microwave darkroom;
the artificial network is connected with a power supply, the load end is in communication connection with the artificial network, the PCB feeding is connected with the load end through the cable, and the cable is connected with the load end through a port;
the PCB, the cable, the load end, the power supply and the artificial network are placed on the test desktop, and the metal is paved on the test desktop in a horizontal mode.
In one embodiment, the load side housing is in communication with ground.
In one embodiment, the test table is defined as a material having a dielectric constant of less than 1.4.
In one embodiment, the antenna model is defined as a metal material.
In one embodiment, the spatial distance between the microwave anechoic chamber, the PCB, the cable, the load end, the power supply, the artificial network, the metal ground, the test desktop, and the antenna model is consistent with the measured environment.
The embodiment of the present invention further provides a simulation apparatus for predicting electromagnetic radiation, which is applied to the simulation method for predicting electromagnetic radiation in any of the above embodiments, and includes:
the system comprises an initial simulation model establishing module, a data processing module and a data processing module, wherein the initial simulation model establishing module is used for establishing an initial simulation model for predicting electromagnetic radiation, the simulation model comprises a PCB (printed circuit board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and the shape and the space distance of each component model are determined;
the final simulation model establishing module is used for defining the material property of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
the simulation condition defining module is used for defining a frequency domain power source at the connecting point of the power supply and the cable, defining a port of the antenna model to receive a load and integrating an electric field on a port connecting line at the position of receiving the load based on the final simulation model;
the simulation model mesh division module is used for carrying out mesh division on the final simulation model according to finite element computing electromagnetism;
and the simulation result obtaining module is used for obtaining the voltage value result of the antenna model port through simulation.
The embodiment of the invention also provides computer terminal equipment which comprises one or more processors and a memory. A memory coupled to the processor for storing one or more programs; when executed by the one or more processors, cause the one or more processors to implement a simulation method for predicting electromagnetic radiation as described in any of the embodiments above.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the simulation method for predicting electromagnetic radiation according to any of the above embodiments.
In the simulation method for predicting electromagnetic radiation, provided by the embodiment of the invention, the simulation application of an actual antenna model is considered to be more practical, the radiation emission value in an actual test can be more accurately predicted, the prediction of the radiation emission of an actual product is guided, the research and development period of the product is shortened, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a simulation method for predicting electromagnetic radiation according to an embodiment of the present invention;
FIG. 2 is a schematic model diagram of a simulation method for predicting electromagnetic radiation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a simulation model provided by an embodiment of the present invention without regard to a test environment;
FIG. 4 is a model diagram of a simulation method for predicting electromagnetic radiation according to an embodiment of the present invention;
FIG. 5 is a comparison of results of a simulation method for predicting electromagnetic radiation provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a computer terminal device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, a simulation method for predicting electromagnetic radiation according to an embodiment of the present invention includes:
s10, establishing an initial simulation model for predicting electromagnetic radiation, wherein the initial simulation model comprises component models of a PCB (printed Circuit Board) 1, a cable 2, a load end 3, a power supply 4, an artificial network 5, a metal ground 6, a test desktop 7 and an antenna model 8 which are arranged in a microwave darkroom 12, and determining the appearance and the spatial distance of each component model;
s20, defining the material attribute of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
s30, based on the final simulation model, defining a frequency domain power source at the connecting point of the power source 4 and the cable 2, defining a port of the antenna model 8 to receive a load, and integrating an electric field on a port connecting line at the position receiving the load;
s40, carrying out mesh division on the final simulation model according to finite element computational electromagnetism;
and S50, simulating to obtain the result of the voltage value of the port of the antenna model 8.
In the embodiment, an antenna model of 200MHZ-300MHZ is established, the actual overall dimension can be adjusted according to the actual working frequency band, the distance from the lowest end to the ground is 250mm, the distance from the right end to the 12 wall of the microwave darkroom is 1000mm, the distance from the right end to the feeder cable is 1000mm +/-10 mm, and the actual overall dimension is adjustable; establishing a test radiation emission test desktop 7, wherein the length and the width of the test desktop can be adjusted according to actual conditions, and are generally 900mm +/-100 mm away from the ground; establishing a test cable 8 with the height of 950mm +/-105 mm from the ground; establishing a metal ground 6, wherein the metal ground 6 is used for keeping top insulation; establishing a simulation load end 3, placing the simulation load end on a desktop, connecting the load end 3 with a cable 2 through a port, and ensuring that a shell of the load end 3 is communicated with the ground; the artificial network 5 is placed on the metal ground; the power supply 4 supplies power for the artificial network 5; the test PCB 1 is placed on one side of the test desktop 7, the appearance routing of the test PCB 1 is changeable, and the feed end of the test PCB 1 is required to be connected with the cable 2. The size of the microwave chamber 12 can vary according to the actual situation of measurement.
Establishing a model according to an actual test working condition, considering the model of a test antenna body, adopting an electromagnetic MAXWELL equation set and a finite element to calculate an electromagnetic algorithm, defining a corresponding model and material properties of each part according to the algorithm, and defining a radiation boundary, wherein the distance between the radiation boundary and the nearest antenna or a desktop is more than a quarter wavelength; a frequency domain power source is defined at the connecting point of the power source 4 and the cable 2, a receiving load is defined at the antenna port 8, a signal receiving port is required to be added to an excitation source antenna port of a cable load end which needs to add a corresponding frequency band, and the impedance of the receiving port is set to be 50 ohms. And integrating the electric field on the port connecting line at the position of the load, and then gridding the simulation model, wherein the gridding needs local encryption, such as material mutation positions. And finally, a voltage value result of the port of the antenna model 8 can be obtained through simulation.
Referring to fig. 3 and 4, the present invention compares the calculation simulation result without considering the test standard antenna and the calculation result with considering the standard antenna environment by a specific case, which illustrates that there is a difference in calculating the electromagnetic radiation emission by considering the test standard antenna and the environment without considering the standard test antenna, and the simulation under the actual test environment working condition is considered closer to the actual measurement result theoretically.
Referring to fig. 5, the invention has strong adaptability, and the simulation content considers the influence of the test antenna body and the actual measurement environment on the antenna radiation emission. The invention can be compared with the common simulation without considering the actual measurement environment and the antenna body to find that the obvious difference exists in the quantity value. The higher curve represents the received voltage strength with the antenna considered and the lower curve represents the voltage strength at the corresponding location without the antenna considered.
And establishing an actual measurement environment model by combining with an actual test working condition, considering the influence of the test antenna on a test result, and establishing simulation application of which simulation is more fit with the actual test working condition, so that simulation and test comparison are more fit.
In one embodiment, the antenna model 8 is connected with an external signal receiving port of the anechoic chamber 12;
the artificial network 5 is connected with a power supply, the load end 3 is in communication connection with the artificial network 5, the PCB 1 feeds electricity and is connected with the load end 3 through a cable 2, and the cable 2 is connected with the load end 3 through a port;
the PCB board 1, the cable 2, the load end 3, the power supply 4 and the artificial network 5 are placed on a test desktop 7, and the metal ground 6 is laid on the test desktop 7.
In one embodiment, the housing of the load side 3 is in communication with ground.
In one embodiment, the test table 7 is defined as a material having a dielectric constant of less than 1.4.
In the embodiment, the desktop is endowed with a material with the dielectric constant of below 1.4, so that the whole Maxwell equation set and the mesh subdivision are applied to the model, thereby considering the influence of the desktop background on the test result.
In one embodiment, the antenna model 8 is defined as a metal material.
In this embodiment, the antenna model 8 is made of metal, and a radiation receiving signal port is defined at the feeding position of the antenna model 8
In one embodiment, the spatial distance between the microwave anechoic chamber 12, the PCB board 1, the cable 2, the load end 3, the power supply 4, the artificial network 5, the metal ground 6, the test desktop 7 and the antenna model 8 is consistent with the measured environment.
In the embodiment, the space distance between the established models must be consistent with the actual measurement environment, the sizes of the models are adjustable, and the sizes must be adjusted to be consistent with the actual test working conditions when the simulation prediction is actual.
The embodiment of the present invention further provides a simulation apparatus for predicting electromagnetic radiation, which is applied to the simulation method for predicting electromagnetic radiation in any of the above embodiments, and includes:
the system comprises an initial simulation model establishing module, a data processing module and a data processing module, wherein the initial simulation model establishing module is used for establishing an initial simulation model for predicting electromagnetic radiation, the simulation model comprises a PCB (printed circuit board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and the shape and the space distance of each component model are determined;
the final simulation model establishing module is used for defining the material property of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
the simulation condition defining module is used for defining a frequency domain power source at the connecting point of the power supply and the cable, defining a port of the antenna model to receive a load and integrating an electric field on a port connecting line at the position of receiving the load based on the final simulation model;
the simulation model mesh division module is used for carrying out mesh division on the final simulation model according to finite element computing electromagnetism;
and the simulation result obtaining module is used for obtaining the voltage value result of the antenna model port through simulation. For specific definitions of the simulation means for predicting electromagnetic radiation, reference may be made to the definitions given above and will not be further described here. The modules in the simulation apparatus for predicting electromagnetic radiation may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Referring to fig. 6, an embodiment of the invention provides a computer terminal device, which includes one or more processors and a memory. A memory is coupled to the processor for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement a simulation method for predicting electromagnetic radiation as in any one of the embodiments described above.
The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the simulation method for predicting the electromagnetic radiation. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the simulation method for predicting electromagnetic radiation described above and achieve technical effects consistent with the above method.
In another exemplary embodiment, a computer readable storage medium comprising program instructions for implementing the steps of the simulation method for predicting electromagnetic radiation in any of the above embodiments when executed by a processor is also provided. For example, the computer readable storage medium may be the above-mentioned memory including program instructions executable by the processor of the computer terminal device to perform the above-mentioned simulation method of predicting electromagnetic radiation and achieve the technical effects consistent with the above-mentioned method.
In summary, the invention combines the actual test condition, establishes the actual measurement environment model, considers the influence of the test antenna on the test result, and constructs the simulation application of the simulation more fitting the actual test condition, so that the simulation and the test comparison are more consistent, the radiation emission value in the actual test can be more accurately predicted, the estimation of the radiation emission of the actual product can be more accurately guided, the product research and development period is shortened, and the cost is saved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A simulation method for predicting electromagnetic radiation, comprising:
establishing an initial simulation model for predicting electromagnetic radiation, wherein the initial simulation model comprises component models of a PCB (printed Circuit Board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and determining the appearance and the spatial distance of each component model;
defining the material property of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
based on the final simulation model, defining a frequency domain power source at the connecting point of the power supply and the cable, defining a port of the antenna model to accept a load, and integrating an electric field on a port connecting line at the position of accepting the load;
carrying out mesh division on the final simulation model according to finite element computational electromagnetism;
and simulating to obtain a port voltage value result of the antenna model.
2. The simulation method for predicting electromagnetic radiation according to claim 1, wherein said antenna model is connected to an external signal receiving port of a microwave anechoic chamber;
the artificial network is connected with a power supply, the load end is in communication connection with the artificial network, the PCB feeding is connected with the load end through the cable, and the cable is connected with the load end through a port;
the PCB, the cable, the load end, the power supply and the artificial network are placed on the test desktop, and the metal is paved on the test desktop in a horizontal mode.
3. The simulation method for predicting electromagnetic radiation of claim 1, wherein said load side enclosure is in communication with ground.
4. The simulation method for predicting electromagnetic radiation of claim 1, wherein the test desktop is defined as a material having a dielectric constant below 1.4.
5. The simulation method for predicting electromagnetic radiation according to claim 1, wherein said antenna model is defined as a metallic material.
6. The simulation method for predicting electromagnetic radiation of claim 1, wherein a spatial distance between said micro-anechoic chamber, said PCB board, said cable, said load side, said power source, said artificial network, said metal ground, said test desktop, and said antenna model is consistent with a measured environment.
7. A simulation apparatus for predicting electromagnetic radiation, comprising:
the system comprises an initial simulation model establishing module, a data processing module and a data processing module, wherein the initial simulation model establishing module is used for establishing an initial simulation model for predicting electromagnetic radiation, the simulation model comprises a PCB (printed circuit board), a cable, a load end, a power supply, an artificial network, a metal ground, a test desktop and an antenna model which are arranged in a microwave darkroom, and the shape and the space distance of each component model are determined;
the final simulation model establishing module is used for defining the material property of each component model according to a finite element computing electromagnetic algorithm to obtain a final simulation model;
the simulation condition defining module is used for defining a frequency domain power source at the connecting point of the power supply and the cable, defining a port of the antenna model to receive a load and integrating an electric field on a port connecting line at the position receiving the load based on the final simulation model;
the simulation model mesh division module is used for carrying out mesh division on the final simulation model according to finite element computing electromagnetism;
and the simulation result obtaining module is used for obtaining a port voltage numerical value result of the antenna model through simulation.
8. A computer terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of predicting electromagnetic radiation simulation of any one of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method for predictive electromagnetic radiation simulation according to any one of claims 1 to 6.
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