A high-intensity radiation field unmanned aerial vehicle cable coupling prediction method based on transient electromagnetic

Abstract

This invention belongs to the technical field of coupling prediction methods, specifically relating to a method for predicting the coupling of UAV cables in high-intensity radiation fields based on transient electromagnetic fields. The method includes the following steps: simulating and modeling the UAV; simulating and modeling the cable; setting up the high-intensity radiation field excitation source; simulation settings; and high-intensity radiation field transient electromagnetic / circuit simulation. This invention uses a plane wave to set the incident direction and angle, sets a probe in the circuit model to monitor the core wire coupling voltage, and uses the Nyquist method to sample the excitation signal. The bidirectional coupling method obtains the coupling parameters of the UAV cable under high-intensity radiation fields, providing a basis for quantifying cable protection indicators. Furthermore, this invention constructs high-intensity radiation field signals based on VBA macro programming, allowing for customizable parameters such as rise time, pulse width, fall time, amplitude, and period of the high-intensity radiation field signal waveform, achieving numerical control and realizing numerical simulation of high-intensity radiation field signals.

Description

Technical Field

[0001] This invention belongs to the technical field of coupling prediction methods, specifically relating to a coupling prediction method for UAV cables based on transient electromagnetic high-intensity radiation fields. Background Technology

[0002] As weapon platform radar radiation power increases, unmanned aerial vehicles (UAVs) inevitably suffer from high-power electromagnetic radiation from enemy or friendly forces when performing reconnaissance and escort missions. Therefore, there is an urgent need for protection against high-intensity radiation fields from UAVs, particularly for predicting the coupling of high-intensity radiation fields in airborne cables. Currently, simulations of high-intensity radiation cable coupling for UAVs mainly rely on spatial field coupling, which cannot accurately calculate the coupling voltage of the cable's internal core wires, hindering the quantitative decomposition of cable protection indicators. Therefore, it is necessary to propose a method for predicting UAV cable coupling in high-intensity radiation fields based on transient electromagnetic / circuit simulations. Summary of the Invention

[0003] To address the technical problem that the simulation of high-intensity radiation cable coupling for UAVs mainly relies on spatial field coupling, which cannot accurately calculate the coupling voltage of the internal core wires of the cable and is not conducive to the quantitative decomposition of cable protection indicators, this invention provides a UAV cable coupling prediction method based on transient electromagnetic high-intensity radiation fields. By constructing a transient electromagnetic circuit model and using the excitation defined in the circuit to perform a simulation of the cable coupling circuit-electromagnetic problem, the coupling voltage of the internal core wires of the cable can be accurately calculated, providing a basis for the quantification of cable protection indicators.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for predicting UAV cable coupling in high-intensity radiation fields based on transient electromagnetic fields includes the following steps:

[0006] S1. Simulate and model the drone;

[0007] S2. Perform simulation modeling of the cable;

[0008] S3, Setting of high-intensity radiation field excitation source;

[0009] S4, Simulation Settings;

[0010] S5, transient electromagnetic / circuit simulation of high-intensity radiation fields.

[0011] The method for simulating and modeling the UAV in S1 is as follows: A structural model of the UAV is created in Sloidworks software, retaining the main structures of the fuselage skin, wings, and vertical tail, while removing minor structures and structural gaps on the internal and external curved surfaces of the fuselage; in the simulation platform CST, a simulation engineering template EMC / EMI→Radiated Susceptibility is created, and HIRF and TimeDomain (TLM) are selected to enter the simulation engineering environment; the UAV structural model is imported at a 1:1 scale, and the global coordinate system is adjusted.

[0012] The method for simulating and modeling cables in S2 is as follows: In the CST Cable studio, create new nodes N1 (X1, Y1, Z1), N2 (X2, Y2, Z2), N3 (X3, Y3, Z3), and N4 (X4, Y4, Z4); create Segments N1-N2, N2-N3, and N3-N4; create Cable Bundles B1; and define the cable type.

[0013] The method for setting the high-intensity radiation field excitation source in S3 is as follows: a sine wave is used to simulate a high-intensity radiation signal using CST VBA technology; the center frequency of the excitation signal is f0, the peak field strength is E0, the rise time is Trise, the duration is Thold, and the fall time is Tfall; the radiation direction of the excitation signal adopts a plane wave to irradiate the UAV from the front.

[0014] The simulation settings in S4 are as follows: Simulation Frequency: Define Fmin and Fmax; Simulation Background: Normal; Simulation Boundaries: Open add space; Electric Field Monitoring Point Locations: Probe1: E-Field (X1, Y1, Z1), Probe2: E-Field (X2, Y2, Z2); Field Monitors: Construct electric field monitor e-field (f=f0), magnetic field monitor h-field (f=f0), and surface current monitor surface-current (f=f0) respectively.

[0015] The method for transient electromagnetic / circuit simulation of high-intensity radiation field in S5 is as follows: a transient simulation task Transienttask is created, a circuit model is constructed, and probes P1, P2, P3, and P4 are set up respectively, as shown in the figure; the transient electromagnetic / circuit co-simulation method is used to solve the cable coupling, the excitation is CST transient co-simulation, the simulation time is set to Tmax, the excitation source is a high-intensity radiation field signal, and the excitation signal is sampled using the Nyquist method, and the cable coupling method is bidirectional coupling.

[0016] Compared with the prior art, the beneficial effects of this invention are:

[0017] This invention constructs a transient electromagnetic circuit model as the signal excitation for a high-intensity radiation field. The incident direction and angle are set using a plane wave, and a probe is placed on the circuit model to monitor the core wire coupling voltage. The excitation signal is sampled using the Nyquist method, and the coupling parameters of the UAV cable under a high-intensity radiation field are obtained through bidirectional coupling, providing a basis for quantifying cable protection indicators. Furthermore, this invention constructs a high-intensity radiation field signal based on VBA macro programming, allowing for customizable parameters such as rise time, pulse width, fall time, amplitude, and period of the high-intensity radiation field signal waveform, achieving numerical control and realizing numerical simulation of high-intensity radiation field signals. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0020] Figure 1 This is a flowchart of the high-intensity radiation field UAV cable coupling prediction process for transient electromagnetic / circuit of the present invention;

[0021] Figure 2 This is a schematic diagram of the cable structure of the UAV of the present invention;

[0022] Figure 3 This is a diagram of the high-intensity radiation field excitation signal of the present invention;

[0023] Figure 4 This is a simulation model diagram of the transient electromagnetic / circuit of the high-intensity radiation field of this invention;

[0024] Figure 5 This is a diagram showing the electric field intensity at the electric field monitoring point of this invention.

[0025] Figure 6 This is a diagram showing the coupling voltage at the cable probes (P1, P2) of the present invention.

[0026] Figure 7 This is a diagram showing the coupling voltage at the cable probes (P3, P4) of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. These descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the claims of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] In this embodiment, as Figure 1 As shown, it includes the following steps:

[0030] I. Unmanned Aerial Vehicle (UAV) Simulation Modeling

[0031] In Sloidworks software, a structural model of the UAV is created, retaining the main structures such as the fuselage skin, wings, and vertical tail, while removing some minor structures and structural gaps on the internal and external curved surfaces of the fuselage. In the simulation platform CST, a simulation project template is created (EMC / EMI→Radiated Susceptibility), and HIRF and Time Domain (TLM) are selected to enter the simulation project environment. The UAV structural model is imported at a 1:1 scale, and the global coordinate system is adjusted.

[0032] II. Cable Modeling

[0033] In the CST Cable studio, create new nodes N1 (5500, 0, 900), N2 (4500, 0, 900), N3 (4500, 0, 1100), and N4 (3500, 0, 1100); create Segments N1-N2, N2-N3, and N3-N4; create Cable Bundles B1, defining the cable type as coaxial cable RG58. Figure 2 As shown.

[0034] III. Setting up the excitation source for the high-intensity radiation field

[0035] A sinusoidal wave simulation of a high-intensity excitation signal was constructed using CST VBA technology. The excitation signal had a center frequency of f0 = 1.5 GHz, a peak field strength of E0 = 8000, a rise time of Trise = 10 Hz, a duration of Thold = 50 Hz, and a fall time of Tfall = 10 Hz. The excitation signal was radiated directly onto the UAV using a plane wave. The waveform of the excitation signal is shown below. Figure 3 As shown, the VBA program code is as follows:

[0036] Function ExcitationFunction(dtime As Double) As Double

[0037] Dim Thold As Double

[0038] Dim f0 As Double

[0039] Dim E0 As Double

[0040] Trise=10

[0041] Thold=50

[0042] f0=1.5

[0043] E0=8000

[0044] Tfall=10

[0045] If 0

[0046] ExcitationFunction = E0*(dtime / Trise)*Sin(2*pi*f0*dtime)

[0047] ElseIf Trise

[0048] ExcitationFunction = E0*Sin(2*pi*f0*dtime)

[0049] ElseIf Tfall+Thold

[0050] ExcitationFunction= E0*((Thold+2*Trise) / Trise-dtime / Trise)*Sin(2*pi*f0*dtime)

[0051] Else

[0052] ExcitationFunction =0

[0053] End If

[0054] End Function

[0055] Sub Main2

[0056] Dim tmax As Double, ntstep As Long

[0057] Dim signal As Object, n As Long, tstep As Double

[0058] Set signal = ResulTriseD("")

[0059] signal.Initialize ntstep

[0060] tstep = tmax / ntstep

[0061] For n=0 To ntstep-1

[0062] signal.SetXY(n, n * tstep, ExcitationFunction(n * tstep))

[0063] Next n

[0064] signal.Save GetProjectBaseName() + GetProjectBaseNameSeparator() +"excitation function.sig"

[0065] signal.AddToTriseee"Excitation Signals\Userdefined unctions\signal1_plot"

[0066] SelectTriseeeItem "Excitation Signals\Userdefined Functions\signal1_plot"

[0067] ResultTriseee.RefreshView

[0068] End Sub

[0069] IV. Simulation Settings

[0070] Define the simulation frequencies Fmin=1GHz and Fmax=2GHz; set the simulation background to Background: Normal; set the simulation boundary to Boundaries: Open add space; set the electric field monitoring point locations Probe1: E-Field (4500, 0, 910) and Probe2: E-Field (5500, 0, 910); establish field monitors: construct the electric field monitor e-field (f=1.5), the magnetic field monitor h-field (f=1.5), and the surface current monitor surface-current (f=1.5) respectively.

[0071] V. Transient Electromagnetic / Circuit Simulation of High-Intensity Radiation Fields

[0072] Create a transient simulation task, construct a circuit model, and set up probes P1, P2, P3, and P4 respectively, as follows: Figure 4 As shown, the transient electromagnetic / circuit co-simulation method is used to solve the cable coupling problem. The excitation is CSTtransient co-simulation, the simulation time is set to Tmax=100ns, the excitation source is a high-intensity radiation field signal, and the excitation signal is sampled using the Nyquist method. The cable coupling method is bidirectional coupling.

[0073] VI. Simulation Results

[0074] The electric field strength results at the electric field monitoring point are as follows: Figure 5 As shown, the coupling voltage waveform at the cable probe is as follows: Figure 6 , Figure 7 As shown.

[0075] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A method for predicting cable coupling of unmanned aerial vehicles (UAVs) in high-intensity radiation fields based on transient electromagnetic fields, characterized in that: Includes the following steps: S1. Simulate and model the drone; S2. Perform simulation modeling of the cable; S3. High-intensity radiation field excitation source setup: A sinusoidal wave simulates a high-intensity radiation signal is constructed using CST VBA technology; the center frequency of the excitation signal is f0, the peak field strength is E0, the rise time is Trise, the duration is Thold, and the fall time is Tfall; the radiation direction of the excitation signal adopts a plane wave to irradiate the UAV directly. S4, Simulation Settings; S5. High-intensity radiation field transient electromagnetic and circuit simulation: Create a transient simulation task, construct a circuit model, and set probes P1, P2, P3, and P4 respectively; use the transient electromagnetic and circuit co-simulation method to solve the cable coupling, use CST transient co-simulation for excitation, set the simulation time to Tmax, use a high-intensity radiation field signal as the excitation source, and use the Nyquist method to sample the excitation signal. The cable coupling method is bidirectional coupling.

2. The method for predicting UAV cable coupling based on transient electromagnetic high-intensity radiation fields according to claim 1, characterized in that: The method for simulating and modeling the UAV in S1 is as follows: A structural model of the UAV is created in Sloidworks software, retaining the main structures of the fuselage skin, wings, and vertical tail, while removing minor structures and structural gaps on the internal and external curved surfaces of the fuselage; in the simulation platform CST, a simulation engineering template EMC / EMI→Radiated Susceptibility is created, and HIRF and TimeDomain (TLM) are selected to enter the simulation engineering environment; the UAV structural model is imported at a 1:1 scale, and the global coordinate system is adjusted.

3. The method for predicting UAV cable coupling based on transient electromagnetic high-intensity radiation fields according to claim 1, characterized in that: The method for simulating and modeling cables in S2 is as follows: In the CST Cable studio, create new nodes N1 (X1, Y1, Z1), N2 (X2, Y2, Z2), N3 (X3, Y3, Z3), and N4 (X4, Y4, Z4); create Segments N1-N2, N2-N3, and N3-N4; create Cable Bundles B1; and define the cable type.

4. The method for predicting UAV cable coupling based on transient electromagnetic high-intensity radiation fields according to claim 1, characterized in that: The simulation settings in S4 are as follows: Simulation Frequency: Simulation Frequency Setting: Define F min F max Simulation background: Normal; Simulation boundaries: Boundaries: Open add space; Electric field monitoring point locations: Probe1: E-Field (X1, Y1, Z1), Probe2: E-Field (X2, Y2, Z2); Field monitors: Construct electric field monitor e-field (f=f0), magnetic field monitor h-field (f=f0), and surface current monitor surface-current (f=f0) respectively.

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