A cabinet self-resonance and shielding effectiveness simulation design method and system

Abstract

The application discloses a kind of cabinet self-resonance and shielding effectiveness simulation design method and system, belong to airborne electronic equipment electromagnetic compatibility design field.For the problem of existing electromagnetic compatibility design lag, rely on experience, trial and error cost is high, the application adopts phased simulation design scheme: first, obtain the available state of equipment model data, when not obtaining equipment model data, carry out self-resonance modal simulation to cabinet model, obtain self-resonance frequency point and electromagnetic field intensity distribution map, guide internal equipment layout to avoid resonance frequency point, generate whole machine model;When having obtained equipment model data, carry out shielding effectiveness simulation to whole machine model, obtain shielding effectiveness curve, when not satisfying design index, iteration optimization opening scheme.The application preposes electromagnetic compatibility design to initial stage of research and development, provides design basis in multidimension, effectively reduces trial and error cost in later period, shortens debugging iteration period, improves electromagnetic compatibility test first-time pass rate.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic compatibility design of airborne electronic equipment, specifically to a simulation design method and system for chassis self-resonance and shielding effectiveness. Background Technology

[0002] With the rapid development of modern electronic information technology, electronic devices are becoming increasingly widespread and highly integrated, leading to increasingly complex electromagnetic environments. On the one hand, the devices themselves generate electromagnetic interference, affecting the normal operation of other devices; on the other hand, strong external electromagnetic fields may intrude into the devices, causing performance degradation or even permanent damage. Therefore, electromagnetic compatibility has become a critical issue that must be considered in the design of electronic devices. Electromagnetic shielding, as a core technical means to suppress electromagnetic interference and ensure reliable operation of equipment, directly determines the quality and reliability of electronic products based on its shielding effectiveness.

[0003] An ideal electromagnetic shield should be a complete, sealed, conductive cavity. However, due to the self-resonance of the chassis, the oscillation frequencies of different areas vary. If the internal module layout happens to be located at the self-resonant frequency, the resonance will be amplified, affecting the overall electromagnetic compatibility performance of the chassis. Moreover, in practical engineering, to meet functional requirements such as heat dissipation, ventilation, display, wiring, and debugging, it is unavoidable to create various holes in the shield. These openings disrupt the electrical continuity of the shield, providing pathways for electromagnetic energy leakage and becoming weak points in the shielding effectiveness, significantly reducing the overall shielding performance.

[0004] In the current electromagnetic compatibility (EMC) design process for airborne equipment, existing technologies typically rely on experience for equipment layout and opening design, with problems only being identified during prototype testing and then rectified. This sequential "design-test-rectification" model results in long debugging and iteration cycles, high trial-and-error costs, and a lack of prior theoretical guidance, leading to a low first-pass rate for EMC tests.

[0005] Therefore, there is a need for a method that can incorporate electromagnetic compatibility design considerations in the early stages of product development, using simulation to identify the self-resonant frequency and weak points in the shielding effectiveness of the chassis in advance, providing front-end theoretical support for equipment layout and opening design. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a simulation design method and system for chassis self-resonance and shielding effectiveness. By analyzing and identifying the self-resonance frequency points of the chassis through self-resonance modal simulation, it provides guidance for the layout of internal equipment to avoid resonant frequencies. Combined with shielding effectiveness simulation, it provides an optimization basis for chassis opening design. It provides front-end theoretical support for the electromagnetic compatibility design of the chassis from multiple dimensions, reduces the cost of trial and error in the later stage, shortens the debugging and iteration cycle, and improves the first-pass rate of electromagnetic compatibility testing.

[0007] This invention is achieved through the following technical solution: Firstly, this application provides a simulation design method for chassis self-resonance and shielding effectiveness, comprising the following steps: Step 1: Obtain the availability status of device model data. If device model data is not available, proceed to Step 2. If device model data is available, proceed to Step 3. Step 2: Perform self-resonant modal simulation analysis on the chassis model to obtain the self-resonant frequency point and electromagnetic field intensity distribution map of the chassis model; determine the layout position of the equipment model in the chassis model based on the self-resonant frequency point and electromagnetic field intensity distribution map, so that the operating frequency of the equipment model avoids the self-resonant frequency point, obtain the equipment layout scheme, and combine the chassis model and the equipment model into a whole machine model. Step 3: Perform shielding effectiveness simulation analysis on the whole machine model to obtain the shielding effectiveness curve of the whole machine model in the scanning frequency band; determine whether the shielding effectiveness meets the design requirements. If not, optimize and iterate the chassis opening scheme until the requirements are met.

[0008] Preferably, step 2, performing self-resonant modal simulation analysis on the chassis model, includes: Import the chassis model into the electromagnetic simulation software, define the material properties of the chassis model, including conductivity, permeability and dielectric constant; set boundary conditions and excitation sources, and perform resonant mode simulation and three-dimensional electric field simulation.

[0009] Preferably, the resonant mode simulation in step 2 includes: The self-resonant frequency points of the chassis model are solved under both lossless and lossy conditions to obtain the electromagnetic field energy distribution inside the chassis model at each resonant frequency.

[0010] Preferably, step 2, determining the layout location of the device model based on the self-resonant frequency point and the electromagnetic field intensity distribution map, includes: The device model is placed in a region with weak electromagnetic energy. It is determined whether the operating frequency of the device model coincides with or is close to the self-resonant frequency. If so, the layout position is adjusted and the simulation is repeated. Through iterative optimization, the operating frequency of the device model is made to avoid all self-resonant frequency points.

[0011] Preferably, step 3, which involves performing a shielding effectiveness simulation analysis on the whole machine model, includes: Import the complete machine model into the electromagnetic simulation software to confirm the position, size and shape of each opening on the chassis model; set radiation boundary conditions and plane wave excitation, and perform frequency sweep simulation to solve.

[0012] Preferably, in step 3, the plane wave excitation is set with incident direction, polarization direction and frequency scanning range according to design requirements; observation points are set inside the chassis, the electric field strength data at the observation points are extracted, and the shielding effectiveness curve is calculated in combination with the field strength parameters of the incident plane wave.

[0013] Preferably, the optimization and iteration of the chassis opening scheme in step 3 includes: When the shielding effectiveness does not meet the design requirements, at least one of the following should be adjusted: the position, size, number, or arrangement of the openings. The shielding effectiveness simulation verification should be performed again until the shielding effectiveness meets the design requirements.

[0014] Preferably, the shielding effectiveness curve described in step 3, combined with the internal electric field distribution results, locates the weak shielding area near the opening and clarifies the main path of electromagnetic energy coupling; The optimization of the opening scheme includes at least one of the following methods: reducing the opening size, changing the opening shape, increasing the opening spacing, adding a conductive pad or waveguide ventilation window at the opening.

[0015] Secondly, this application provides a chassis self-resonance and shielding effectiveness simulation design system, characterized in that it includes: The acquisition module is used to obtain the availability status of equipment model data. If the equipment model data is not acquired, the self-resonance simulation module is triggered. If the equipment model data is acquired, the shielding effectiveness simulation module is triggered. The self-resonance simulation module is used to perform self-resonance modal simulation analysis on the chassis model to obtain the self-resonance frequency point and electromagnetic field intensity distribution map of the chassis model; based on the self-resonance frequency point and electromagnetic field intensity distribution map, the layout position of the equipment model in the chassis model is determined so that the operating frequency of the equipment model avoids the self-resonance frequency point, and the equipment layout scheme is obtained. The chassis model and the equipment model are combined into a complete machine model. The shielding effectiveness simulation module is used to perform shielding effectiveness simulation analysis on the whole machine model, obtain the shielding effectiveness curve of the whole machine model in the scanning frequency band, and determine whether the shielding effectiveness meets the design requirements. If it does not meet the requirements, the chassis opening scheme is optimized and iterated until the requirements are met.

[0016] Thirdly, this application provides an electronic device including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the chassis self-resonance and shielding effectiveness simulation design method as described above.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The self-resonance and shielding effectiveness simulation design method for chassis provided in this application addresses the pain points of existing airborne equipment chassis electromagnetic compatibility design, which relies on experience-based judgment and involves long iteration cycles and high trial-and-error costs due to post-rectification. It adopts a phased design approach adapted to the R&D progress, dynamically switching simulation paths through pre-condition judgment. In the early stages of R&D, when internal equipment models are not yet available, self-resonance modal simulation is performed only on the chassis cavity to obtain the cavity's inherent resonant frequency and internal electromagnetic field intensity distribution. This guides the layout adjustment of internal equipment, ensuring that the equipment's operating frequency avoids the high-energy resonant region, eliminating the potential for electromagnetic interference amplified by cavity resonance from a spatial arrangement perspective. Simultaneously, a complete machine model is generated. Once R&D progresses to the stage where a complete equipment model and opening scheme are available, shielding effectiveness simulation is performed based on the complete machine model. Plane wave excitation simulates external incident electromagnetic interference, and frequency scanning obtains the shielding effectiveness curve for the corresponding frequency band. Weak shielding areas near the openings are located, and the position, size, and other parameters of the openings are iteratively adjusted until the design specifications are met. This solution brings electromagnetic compatibility design to the early stages of R&D, covering two core dimensions: internal layout resonance avoidance and aperture shielding performance optimization. It replaces the traditional experience-based design and later testing and rectification model, effectively shortening the product debugging and iteration cycle, reducing prototype trial and error costs, and significantly improving the first-pass rate of electromagnetic compatibility testing.

[0018] This application also proposes a chassis self-resonance and shielding effectiveness simulation design system, an electronic device, and a computer storage medium, which possess all the advantages of the aforementioned chassis self-resonance and shielding effectiveness simulation design method. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an overall flowchart of the simulation design method for chassis self-resonance and shielding effectiveness of the present invention; Figure 2 This is a detailed flowchart illustrating the simulation design method for chassis self-resonance and shielding effectiveness of the present invention. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] For ease of understanding, the following two terms used in this application are explained uniformly: A chassis model refers to a three-dimensional structural model of the outer shell of airborne electronic equipment, including the geometry, wall thickness, material properties, and the location and size of openings on each wall surface.

[0023] Equipment model refers to the three-dimensional structural model of each electronic module installed inside the chassis, including the geometry, spatial position and material properties of each module.

[0024] A complete machine model refers to a three-dimensional structural model formed by placing a device model inside a chassis model according to a preset layout scheme.

[0025] See Figure 1 A simulation design method for chassis self-resonance and shielding effectiveness includes the following steps: Step 1: Obtain the availability status of device model data. If device model data is not available, proceed to Step 2. If device model data is available, proceed to Step 3. Step 2: Import the chassis model into the electromagnetic simulation software, define material properties, set boundary conditions and excitation sources, and perform resonant mode simulation and three-dimensional electric field simulation to obtain the self-resonant frequency point and electromagnetic field intensity distribution map of the chassis model; based on the self-resonant frequency point and electromagnetic field intensity distribution map, place the equipment model in a region with weak electromagnetic energy, and through iterative optimization, make the operating frequency of the equipment model avoid the self-resonant frequency point to obtain the equipment layout scheme; combine the chassis model and the equipment model into a complete machine model; Step 3: Import the whole machine model into the electromagnetic simulation software, confirm the position and size of the opening, set the radiation boundary conditions and plane wave excitation, execute the shielding effectiveness simulation, and obtain the shielding effectiveness curve; determine whether the shielding effectiveness meets the design requirements. If it does not meet the requirements, optimize and iterate the position or size of the opening until the requirements are met, and output the final design scheme.

[0026] This method for electromagnetic compatibility (EMC) design of airborne equipment, combining chassis self-resonance and shielding effectiveness simulation, firstly determines the execution path through pre-judgment, selecting different design entry points based on whether equipment model data has been obtained. Secondly, with only the equipment model available, self-resonance modal simulation and three-dimensional electric field simulation are performed on the chassis model. Electromagnetic simulation software is used to solve for the intrinsic resonant modes of the chassis cavity in a virtual environment, obtaining the self-resonant frequency points and electromagnetic field energy distribution map. Since the chassis, as a metal cavity, generates electromagnetic resonance at specific frequencies, the field strength distribution varies significantly at different spatial locations. If the equipment's operating frequency coincides with the resonant frequency and is located in a region with strong field strength, the resonant energy will be amplified, leading to excessive electromagnetic radiation. This method, based on the field strength distribution map obtained from the simulation, places the equipment model in a region with weak electromagnetic field energy and iteratively adjusts it to ensure the equipment's operating frequency avoids all self-resonant frequency points, eliminating the resonance risk from a physical mechanism perspective. Finally, shielding effectiveness simulation is performed on the entire model. Radiation boundary conditions are set to simulate open space, plane wave excitation is applied to simulate external electromagnetic interference, and observation points are set at the locations of key sensitive equipment inside the chassis. After frequency scanning, the shielding effectiveness curve is obtained. The shielding effectiveness curve quantitatively reflects the attenuation capability of the chassis against external electromagnetic waves at different frequencies. Combined with the internal electric field distribution, it can accurately locate weak shielding areas near openings. When the shielding effectiveness does not meet design specifications, the overall shielding performance of the chassis can be effectively improved through iterative optimization of the opening position and size. This method organically combines self-resonance analysis with shielding effectiveness simulation, introducing electromagnetic compatibility design considerations from the early stages of R&D. It provides guidance for avoiding resonance in equipment layout and provides data support for shielding optimization of opening design, fundamentally solving the problems of traditional methods relying on experience and repeated trial and error.

[0027] Example 1 This embodiment provides a simulation design method for chassis self-resonance and shielding effectiveness. By analyzing the self-resonance mode, the self-resonance frequency point of the chassis is identified, providing guidance for the layout of internal equipment. Combined with shielding effectiveness simulation, it provides an optimization basis for chassis opening design. It provides front-end theoretical support for the electromagnetic compatibility design of the chassis from multiple dimensions, reduces the cost of trial and error in the later stage, shortens the debugging and iteration cycle, and improves the first-pass rate of electromagnetic compatibility testing.

[0028] Reference Figure 2 The following section provides a more detailed explanation of the simulation design method for the self-resonance and shielding effectiveness of this chassis, including the following steps: Step 1: Obtain the acquisition status of device model data; If the equipment model data is not obtained, proceed to step 2 to perform self-resonant modal simulation analysis and layout optimization on the chassis model; If the equipment model data has been obtained, proceed to step 3 to perform a shielding effectiveness simulation analysis on the whole machine model.

[0029] It should be noted that the chassis model refers to the three-dimensional structural model of the outer shell of airborne electronic equipment, while the equipment model refers to the three-dimensional structural model of each electronic module installed inside the chassis.

[0030] In the first scenario, when equipment model data is unavailable, self-resonant modal simulation analysis is performed only on the empty chassis model. The simulation yields the chassis's self-resonant frequency and electromagnetic field intensity distribution, allowing for the determination of the optimal equipment placement within the chassis to avoid overlap between the equipment's operating frequency and the chassis's self-resonant frequency. Then, the equipment layout scheme and the chassis model are combined to form a chassis assembly model incorporating the equipment layout, and shielding effectiveness simulation is performed.

[0031] In the second scenario, if the equipment model data has been obtained, it indicates that the equipment layout has been determined, and the shielding effectiveness of the chassis can be directly simulated and optimized.

[0032] As the completeness of design data gradually improves throughout the entire R&D cycle of airborne equipment, a single simulation process cannot simultaneously adapt to both early-stage design and later-stage detailed design scenarios. Waiting for all data to be complete before starting EMC design would miss the optimal opportunity for early optimization. This step achieves scenario-specific simulation path adaptation through pre-condition judgment, allowing EMC design to be carried out in stages without waiting for all design data to be complete. This brings the EMC optimization process forward to the early stages of R&D, covering the design requirements of the entire R&D process and significantly improving design flexibility and overall R&D efficiency.

[0033] Step 2: Based on the chassis model, perform self-resonant mode simulation analysis by defining material properties, setting boundary conditions and excitation sources, obtain the self-resonant frequency points and electromagnetic field intensity distribution of the chassis model, determine the layout position of the equipment model in the chassis model according to the simulation results, so that the operating frequency of the equipment model avoids the self-resonant frequency points, obtain the equipment layout scheme, and combine the chassis model and the equipment layout scheme into the whole machine model.

[0034] The specific implementation method of step 2 will be described in detail below.

[0035] S2.1: Import the chassis model into the electromagnetic simulation software, and define the material properties of each component according to the actual materials used in the chassis. The material properties include electrical conductivity, magnetic permeability and dielectric constant.

[0036] S2.2: Set the computational boundary conditions for the chassis model, including ideal electric boundary and radiation boundary; set the excitation source at the preset position to excite the resonant mode inside the chassis model.

[0037] S2.3: Perform resonant mode simulation of the chassis model, solve for the self-resonant frequency points of the chassis model under lossless and lossy conditions respectively, and obtain the electromagnetic field energy distribution inside the chassis model at each resonant frequency.

[0038] Among them, the lossless state is used to solve the ideal inherent resonance characteristics of the cavity, while the lossy state is used to simulate the resonance attenuation characteristics under actual material loss, covering both ideal characteristic analysis and actual working condition simulation needs.

[0039] S2.4: Perform a three-dimensional electric field simulation on the chassis model to obtain the three-dimensional electric field intensity distribution map corresponding to each resonant frequency point, which intuitively shows the spatial distribution of the electromagnetic field at each resonant frequency point.

[0040] S2.5: Based on the self-resonant frequency point and electromagnetic field intensity distribution diagram, determine the initial layout position of the equipment model within the chassis model; determine whether the operating frequency of the equipment model coincides with or is close to the self-resonant frequency point of the chassis model; If so, adjust the layout of the device model and re-execute S2.1 to S2.4 for simulation verification until the operating frequency of the device model avoids all self-resonant frequency points; If not, then a device layout scheme that satisfies the self-resonance avoidance requirement is obtained.

[0041] This layout scheme is used to guide the design of internal equipment layout in the early stage of research and development, and reduces the risk of electromagnetic interference from cavity resonance amplification from the perspective of spatial layout.

[0042] S2.6: Combine the chassis model with the equipment models placed according to the equipment layout scheme to form the complete machine model.

[0043] As a closed or semi-closed metal cavity, a computer chassis can generate electromagnetic resonance at specific frequencies, with varying resonant energy distributions in different areas. If the operating frequency of the internal electronic equipment coincides with or is close to the chassis's self-resonant frequency, the resonance will be amplified, leading to excessive electromagnetic radiation and affecting the equipment's electromagnetic compatibility (EMC) performance. Self-resonant modal simulation allows for rapid qualitative identification of the chassis's self-resonant frequency and electromagnetic field distribution in the early design stages, even with only a device model available. This provides a reference for equipment layout to avoid resonant frequencies, reducing EMC risks from the outset.

[0044] In some embodiments, the electromagnetic simulation software described above can be a three-dimensional electromagnetic simulation tool such as HFSS, CST Studio Suite, FEKO, or COMSOL Multiphysics. Boundary condition settings can be adjusted according to the actual chassis installation environment, such as setting a radiating boundary on the outer wall of the chassis to simulate open space conditions. The excitation source can be a dipole antenna, a waveport, or a surface current source.

[0045] In some embodiments, the resonant mode solution may employ an eigenmode solver or a frequency domain solver.

[0046] Step 3: Using the whole machine model as input, perform shielding effectiveness simulation by confirming the opening parameters, setting boundary conditions and plane wave excitation, and output a design scheme that meets the shielding effectiveness requirements after optimization and iteration of the opening scheme.

[0047] Based on the whole machine model as input, the shielding effectiveness is simulated by confirming the opening parameters, setting boundary conditions and plane wave excitation, and judging whether the shielding effectiveness meets the design requirements. If it does not meet the requirements, the opening scheme is optimized and iterated. If it does meet the requirements, the optimal design scheme is obtained, and the electromagnetic compatibility design of the chassis is completed.

[0048] The specific implementation method of step 3 will be described in detail below.

[0049] S3.1: Import the complete machine model into the electromagnetic simulation software, define the material electromagnetic properties of the chassis and internal equipment, and confirm the location, size, shape, and quantity of all openings on the chassis model. It should be noted that the complete machine model is either the self-resonant simulation optimized model output in step 2, or the original complete machine model already containing the equipment layout obtained directly in step 1.

[0050] It should be noted that the complete machine model is the complete machine model output in step 2 after self-resonance simulation optimization, or the original complete machine model that already includes the equipment layout obtained directly in step 1.

[0051] S3.2: Set the radiation boundary conditions around the simulation area to simulate the electromagnetic wave propagation characteristics in open space; apply plane wave excitation to simulate external electromagnetic interference, and set the incident direction, polarization direction and frequency scanning range of the plane wave according to design requirements; select the installation location of key sensitive equipment inside the chassis as observation points to collect internal electric field strength data.

[0052] S3.3: Conduct frequency scanning simulation and solve the problem. After the simulation is completed, extract the electric field strength data at the observation point. Combine the field strength parameters of the incident plane wave to calculate the shielding effectiveness curve of the whole model in the scanning frequency band. At the same time, combine the internal electric field distribution results to locate the weak shielding area near the opening and clarify the main path of electromagnetic energy coupling.

[0053] S3.4: Compare the shielding effectiveness curve obtained from the simulation with the preset electromagnetic compatibility design indicators to determine whether the shielding effectiveness meets the design requirements.

[0054] If satisfied, output the current design scheme to complete the electromagnetic compatibility design of the chassis; If the requirements are not met, the position, size, number, or arrangement of the openings will be adjusted and optimized, and S3.1 to S3.3 will be re-executed for simulation verification until the shielding effectiveness meets the design requirements, and the final design scheme will be output.

[0055] In practical computer chassis, openings are unavoidable due to functional requirements such as heat dissipation, ventilation, and wiring. These openings disrupt the electrical continuity of the shielding, creating electromagnetic energy leakage paths and significantly reducing the overall shielding effectiveness of the chassis. By simulating external electromagnetic interference using plane wave excitation, the shielding effectiveness at observation points inside the computer chassis can be simulated, allowing for a quantitative assessment of the impact of openings on shielding performance. When shielding effectiveness does not meet requirements, iterative optimization of the opening scheme provides data support for optimizing the location and size of the openings, avoiding insufficient shielding effectiveness caused by blindly creating openings.

[0056] In some embodiments, plane wave excitation can be configured with different incident directions and polarization modes to simulate external electromagnetic interference sources from different directions. Observation points can be set according to the location of critical sensitive equipment inside the chassis. The frequency scanning range can be set according to the frequency band of the electromagnetic environment in which the airborne equipment is located, such as 10kHz to 18GHz. Shielding effectiveness can be evaluated using indicators such as electric field shielding effectiveness, magnetic field shielding effectiveness, or power shielding effectiveness.

[0057] In some embodiments, aperture optimization methods may include reducing aperture size, changing aperture shape, increasing aperture spacing, adding conductive pads or waveguide ventilation windows at the aperture, and other shielding measures.

[0058] Example 2 A simulation design system for chassis self-resonance and shielding effectiveness includes: The acquisition module is used to obtain the availability status of equipment model data. If the equipment model data is not acquired, the self-resonance simulation module is triggered. If the equipment model data is acquired, the shielding effectiveness simulation module is triggered. The self-resonance simulation module is used to perform self-resonance modal simulation analysis on the chassis model to obtain the self-resonance frequency point and electromagnetic field intensity distribution map of the chassis model; based on the self-resonance frequency point and electromagnetic field intensity distribution map, the layout position of the equipment model in the chassis model is determined so that the operating frequency of the equipment model avoids the self-resonance frequency point, and the equipment layout scheme is obtained. The chassis model and the equipment model are combined into a complete machine model. The shielding effectiveness simulation module is used to perform shielding effectiveness simulation analysis on the whole machine model, obtain the shielding effectiveness curve of the whole machine model in the scanning frequency band, and determine whether the shielding effectiveness meets the design requirements. If it does not meet the requirements, the chassis opening scheme is optimized and iterated until the requirements are met.

[0059] This system, a simulation design system for chassis self-resonance and shielding effectiveness, performs self-resonance modal simulation of the chassis when equipment model data is unavailable in the early stages of design. This includes creating or importing the chassis model, defining material properties, setting boundary conditions and excitations, analyzing resonance mode results under lossless and lossy states, and analyzing three-dimensional electric field results. The simulation identifies oscillation frequencies in different areas within the chassis that are prone to self-excitation, allowing for the proactive avoidance of devices with the same or similar frequencies in electronic equipment layout. When equipment models or information are available, the system performs shielding effectiveness simulation analysis of the chassis. This includes importing the chassis model and defining material properties, confirming the location and specific dimensions of chassis openings, setting boundary conditions and plane wave excitations, and using plane wave excitations to simulate electromagnetic interference to simulate the shielding effectiveness of the chassis and provide guidance for chassis opening methods. This invention's method for electromagnetic compatibility (EMC) design of airborne equipment, combining chassis self-resonance modal analysis and shielding effectiveness, provides front-end guidance for the overall EMC design of the chassis, reducing later trial-and-error costs, reducing iteration time, and effectively improving the first-pass yield of EMC tests for airborne electronic equipment.

[0060] It should be noted that, in the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another device, or some features may be ignored or not executed. The modules described as separate components may or may not be physically separated. The components shown as modules may be one or more physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs.

[0061] Furthermore, in the various embodiments of the present invention, the modules can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The integrated unit described above can be implemented in hardware or as a software functional unit.

[0062] An electronic device provided in this application includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of a chassis self-resonance and shielding effectiveness simulation design method as described in any of the above embodiments.

[0063] Another electronic device provided in this application embodiment may further include: an input port connected to a processor for transmitting multimodal data collected by an external acquisition device to the processor; a display unit connected to the processor for displaying the processor's processing results to the outside world; and a communication module connected to the processor for enabling communication between the electronic device and the outside world. The display unit may be a display panel, a laser scanning display, etc.; the communication method adopted by the communication module includes, but is not limited to, Mobile High Definition Link (HML), Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), and wireless connection (including Wi-Fi, Bluetooth, Bluetooth Low Energy, and IEEE 802.11s-based communication technology).

[0064] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the steps of a chassis self-resonance and shielding effectiveness simulation design method as described in any of the above embodiments.

[0065] For descriptions of relevant parts in the chassis self-resonance and shielding effectiveness simulation design system, electronic device, and computer-readable storage medium provided in this application embodiment, please refer to the detailed description of the corresponding parts in the chassis self-resonance and shielding effectiveness simulation design method provided in this application embodiment, which will not be repeated here. Furthermore, parts of the technical solutions provided in this application embodiment that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0066] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A simulation design method for chassis self-resonance and shielding effectiveness, characterized in that, Includes the following steps: Step 1: Obtain the availability status of device model data. If device model data is not available, proceed to Step 2. If device model data is available, proceed to Step 3. Step 2: Perform self-resonant modal simulation analysis on the chassis model to obtain the self-resonant frequency point and electromagnetic field intensity distribution map of the chassis model; determine the layout position of the equipment model in the chassis model based on the self-resonant frequency point and electromagnetic field intensity distribution map, so that the operating frequency of the equipment model avoids the self-resonant frequency point, obtain the equipment layout scheme, and combine the chassis model and the equipment model into a whole machine model. Step 3: Perform shielding effectiveness simulation analysis on the whole machine model to obtain the shielding effectiveness curve of the whole machine model in the scanning frequency band; determine whether the shielding effectiveness meets the design requirements. If not, optimize and iterate the chassis opening scheme until the requirements are met.

2. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 1, characterized in that, Step 2 involves performing self-resonant modal simulation analysis on the chassis model, including: Import the chassis model into the electromagnetic simulation software, define the material properties of the chassis model, including conductivity, permeability and dielectric constant; set boundary conditions and excitation sources, and perform resonant mode simulation and three-dimensional electric field simulation.

3. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 2, characterized in that, The resonant mode simulation described in step 2 includes: The self-resonant frequency points of the chassis model are solved under both lossless and lossy conditions to obtain the electromagnetic field energy distribution inside the chassis model at each resonant frequency.

4. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 1, characterized in that, Step 2, determining the layout of the device model based on the self-resonant frequency point and electromagnetic field intensity distribution diagram, includes: The device model is placed in a region with weak electromagnetic energy. It is determined whether the operating frequency of the device model coincides with or is close to the self-resonant frequency. If so, the layout position is adjusted and the simulation is repeated. Through iterative optimization, the operating frequency of the device model is made to avoid all self-resonant frequency points.

5. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 1, characterized in that, Step 3 involves performing a shielding effectiveness simulation analysis on the entire machine model, including: Import the complete machine model into the electromagnetic simulation software to confirm the position, size and shape of each opening on the chassis model; set radiation boundary conditions and plane wave excitation, and perform frequency sweep simulation to solve.

6. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 5, characterized in that, In step 3, the plane wave excitation is set according to the design requirements, including the incident direction, polarization direction, and frequency scanning range. Observation points are set inside the chassis, and the electric field strength data at the observation points are extracted. The shielding effectiveness curve is calculated by combining the field strength parameters of the incident plane wave.

7. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 1, characterized in that, Step 3 involves optimizing and iterating the chassis opening scheme, including: When the shielding effectiveness does not meet the design requirements, at least one of the following should be adjusted: the position, size, number, or arrangement of the openings. The shielding effectiveness simulation verification should be performed again until the shielding effectiveness meets the design requirements.

8. The simulation design method for chassis self-resonance and shielding effectiveness according to claim 1, characterized in that, The shielding effectiveness curve described in step 3, combined with the internal electric field distribution results, locates the weak shielding area near the opening and clarifies the main path of electromagnetic energy coupling; The optimization of the opening scheme includes at least one of the following methods: reducing the opening size, changing the opening shape, increasing the opening spacing, adding a conductive pad or waveguide ventilation window at the opening.

9. A simulation design system for chassis self-resonance and shielding effectiveness, characterized in that, include: The acquisition module is used to obtain the availability status of equipment model data. If the equipment model data is not acquired, the self-resonance simulation module is triggered. If the equipment model data is acquired, the shielding effectiveness simulation module is triggered. The self-resonance simulation module is used to perform self-resonance modal simulation analysis on the chassis model to obtain the self-resonance frequency points and electromagnetic field intensity distribution of the chassis model. Based on the self-resonant frequency point and electromagnetic field intensity distribution diagram, determine the layout position of the equipment model in the chassis model, so that the operating frequency of the equipment model avoids the self-resonant frequency point, obtain the equipment layout scheme, and combine the chassis model and the equipment model into a complete machine model. The shielding effectiveness simulation module is used to perform shielding effectiveness simulation analysis on the whole machine model, obtain the shielding effectiveness curve of the whole machine model in the scanning frequency band, and determine whether the shielding effectiveness meets the design requirements. If it does not meet the requirements, the chassis opening scheme is optimized and iterated until the requirements are met.

10. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the chassis self-resonance and shielding effectiveness simulation design method as described in any one of claims 1 to 8.

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