Aircraft fuel tank electromagnetic prototype construction method based on conduction impedance

Abstract

The invention belongs to the field of airplane electromagnetic compatibility and thunder and lightning protection, and particularly relates to an airplane fuel tank electromagnetic prototype construction method based on conduction impedance, which is suitable for construction of electromagnetic prototypes of various airplane fuel tanks, and is also suitable for construction of electromagnetic prototypes of internal pipelines, wiring harnesses and other parts of the fuel tanks. And a foundation can be laid for construction of a high-precision electromagnetic prototype of an aircraft fuel tank and lightning protection simulation and design based on the electromagnetic prototype of the fuel tank.

Description

Technical Field

[0001] The present application belongs to the field of aircraft electromagnetic compatibility and lightning protection, and specifically relates to a method for constructing an electromagnetic prototype of an aircraft fuel tank based on conduction impedance. Background Art

[0002] On average, more than 8 million thunderstorms occur on Earth every day. Aircraft will inevitably encounter atmospheric lightning environments. The huge lightning energy and lightning electromagnetic radiation cause flight accidents to occur from time to time. Aircraft lightning protection is a necessary measure to ensure aircraft flight safety, among which lightning protection of aircraft fuel tanks is the top priority.

[0003] A large amount of design verification work for lightning protection of aircraft fuel tanks requires not only the test data of test pieces as a basic support, but also the use of electromagnetic modeling and simulation technology to complete the rapid evaluation and rapid iteration of the design scheme effect. In view of this, this application is proposed. Summary of the invention

[0004] The purpose of this application is to provide a method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, which can quickly and accurately complete the electromagnetic modeling of the aircraft fuel tank, integrate electrical lap design indicators, conductive impedance test data and electromagnetic simulation prediction data, and ensure to a greater extent the simulation of the actual situation of lightning current distribution after the aircraft fuel tank is struck by lightning, laying the foundation for the lightning protection design of the aircraft fuel tank.

[0005] To overcome or alleviate at least one of the known technical deficiencies.

[0006] The technical solution of this application is: A method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, comprising: Step 1: Test and obtain the conduction impedance between adjacent fastening bolts on the fuel tank; Step 2: construct a simplified electromagnetic model of adjacent fastening bolts, conduct conduction impedance simulation, obtain the conduction impedance between adjacent fastening bolts, and adjust the simplified electromagnetic model of adjacent fastening bolts so that the conduction impedance between adjacent fastening bolts obtained by the conduction impedance simulation is consistent with the conduction impedance between adjacent fastening bolts on the fuel tank box section obtained by the test; Step 3: Test and obtain the conduction impedance between adjacent components on the fuel tank; Step 4: construct a simplified electromagnetic model of adjacent components, conduct a conduction impedance simulation, obtain the conduction impedance of the adjacent components, and adjust the simplified electromagnetic model of the adjacent components so that the conduction impedance of the adjacent components obtained by the conduction impedance simulation is consistent with the conduction impedance between the adjacent components on the fuel tank obtained by the test; Step 5: Test and obtain the conduction impedance of the two ends of the separate component on the fuel tank, wherein the separate component refers to a component that can be removed from the fuel tank box section; Step 6: construct a simplified electromagnetic model of the individual component, conduct a conduction impedance simulation, obtain the conduction impedance at both ends of the individual component, and adjust the simplified electromagnetic model of the individual component so that the conduction impedance at both ends of the individual component obtained by the conduction impedance simulation is consistent with the conduction impedance at both ends of the individual component on the fuel tank obtained by the test; Step 7: Using the simplified electromagnetic models of adjacent fastening bolts, the simplified electromagnetic models of adjacent components, and the simplified electromagnetic models of individual components, a preliminary electromagnetic prototype of the fuel tank is constructed; Step 8: Test and obtain the conduction impedance between non-adjacent components on the fuel tank; Step 9: Using the preliminary electromagnetic prototype, conduct a conduction impedance simulation to obtain the conduction impedance between non-adjacent components, and adjust the local conductivity of the preliminary electromagnetic prototype so that the conduction impedance between non-adjacent components obtained by the conduction impedance simulation and the conduction impedance between non-adjacent components on the fuel tank obtained by the test do not deviate by more than a first set threshold; Step 10: Adjust the components with changed conductivity in the preliminary electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed the second set value, and the deviation between the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed the third set threshold, thereby obtaining an intermediate electromagnetic prototype of the fuel tank; Step 11: Test and obtain the conduction impedance at both ends of the fuel tank box section; Step 12: Use the intermediate electromagnetic prototype to carry out conduction impedance simulation to obtain the conduction impedance at both ends of the box segment, and adjust the local conductivity of the intermediate electromagnetic prototype so that the conduction impedance at both ends of the box segment obtained by the conduction impedance simulation and the conduction impedance at both ends of the fuel tank box segment obtained by the test do not deviate by more than a fourth set threshold; Step 13: Adjust the components with changed conductivity in the intermediate electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed the fifth set value, the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed the sixth set threshold, and the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test does not exceed the seventh set threshold, so as to obtain the final electromagnetic prototype of the fuel tank.

[0007] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, in step five and step six, the separate parts include skin panels and pipelines.

[0008] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, in step nine, the local conductivity of the preliminary electromagnetic prototype is adjusted so that the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by testing do not deviate by more than a first set threshold, specifically: According to the three-dimensional distribution diagram of conductive impedance, the conductivity of the area where the conductive impedance changes faster in the preliminary electromagnetic prototype is adjusted so that the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by testing do not exceed a first set threshold.

[0009] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, in step 12, the local conductivity of the intermediate electromagnetic prototype is adjusted so that the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test do not deviate by more than a fourth set threshold, specifically: The conductivity of the region where the conductive impedance changes faster in the intermediate electromagnetic prototype is adjusted so that the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test do not deviate by more than a fourth set threshold.

[0010] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, the first set threshold value < the third set threshold value < the sixth set threshold value; The fourth set threshold value < the seventh set threshold value; The first set threshold value < the fourth set threshold value, the third set threshold value < the seventh set threshold value < the sixth set threshold value; The second set value=the fifth set value>=the sixth set threshold value.

[0011] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, the first set threshold is specifically 5%; The third setting value is specifically 10%; The sixth set value is specifically 20%.

[0012] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, the fourth set threshold is specifically 10%; The seventh setting threshold is specifically 15%.

[0013] According to at least one embodiment of the present application, in the above-mentioned method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, the second set value and the fifth set value are specifically set to 20%.

[0014] This application has at least the following beneficial technical effects: A method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance is provided. The method is applicable to the construction of electromagnetic prototypes for various types of aircraft fuel tanks, and is also applicable to the construction of electromagnetic prototypes for components such as internal pipelines and wiring harnesses of fuel tanks. It can lay a foundation for the construction of high-precision electromagnetic prototypes of aircraft fuel tanks, as well as lightning protection simulation and design based on electromagnetic prototypes of fuel tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance provided in an embodiment of the present application; Figure 2 is a top view of the aircraft fuel tank box section structure provided by an embodiment of the present application; Figure 3 It is a side view of the aircraft fuel tank box section structure provided in an embodiment of the present application.

[0016] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0017] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be described in further detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design.

[0018] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall have the usual meanings understood by those of ordinary skill in the art to which this application belongs. The words used in the description of this application to indicate orientation are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application indicates that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0019] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0020] This application provides a method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, such as Figure 1 As shown, this method is applicable to the construction of electromagnetic prototypes for various types of aircraft fuel tanks, and is also applicable to the construction of electromagnetic prototypes for components such as pipelines and wiring harnesses inside the fuel tanks. It can lay the foundation for the construction of high-precision electromagnetic prototypes for aircraft fuel tanks, as well as lightning protection simulation and design based on electromagnetic prototypes of fuel tanks.

[0021] See also Figure 2-Figure 3 , Schematic diagram of the distribution of fastening screws and their components, individual parts, and box sections in the aircraft fuel tank structure.

[0022] Step 1: Test and obtain the conduction impedance between adjacent fastening bolts on the fuel tank. Record the conduction impedance between three pairs of adjacent fastening bolts: A1=5mΩ, A2=4mΩ, A3=3mΩ, and the average value Aa=4 mΩ.

[0023] Step 2: Construct a simplified electromagnetic model of adjacent fastening bolts, carry out conduction impedance simulation, obtain the conduction impedance between adjacent fastening bolts, record the conduction impedance between three pairs of adjacent fastening bolts B1=2mΩ, B2=1.5mΩ, B3=5mΩ, adjust the simplified electromagnetic model of adjacent fastening bolts, make the conduction impedance between adjacent fastening bolts obtained by conduction impedance simulation consistent with the conduction impedance between adjacent fastening bolts on the fuel tank box section obtained by test, among which, the conductivity of the simplified electromagnetic model corresponding to B1 and B2 decreases, and the conductivity of the simplified electromagnetic model corresponding to B3 increases, and finally B1=5mΩ, B2=4mΩ, B3=3mΩ.

[0024] Step 3: Test and obtain the conduction impedance between adjacent components on the fuel tank. The conduction impedance between three pairs of adjacent components is recorded as C1=40mΩ, C2=330mΩ, and C3=570mΩ.

[0025] Step 4: Construct a simplified electromagnetic model of adjacent components, conduct conduction impedance simulation, obtain the conduction impedance of adjacent components, and record the conduction impedance between three pairs of adjacent components: D1=80mΩ, D2=130mΩ, and D3=220mΩ. Adjust the simplified electromagnetic model of adjacent components so that the conduction impedance of adjacent components obtained by conduction impedance simulation is consistent with the conduction impedance between adjacent components on the fuel tank obtained by test. The conductivity of the simplified electromagnetic model corresponding to D2 and D3 decreases, and the conductivity of the simplified electromagnetic model corresponding to D1 increases. Finally, D1=40mΩ, D2=330mΩ, and D3=570mΩ are obtained.

[0026] Step 5: Test and obtain the conduction impedance at both ends of the individual parts on the fuel tank, where the individual parts refer to components such as skin panels or pipelines that can be removed from the fuel tank box section. The conduction impedances of the three individual parts are recorded as E1=8mΩ, E2=800mΩ, and E3=670mΩ.

[0027] Step 6. Construct a simplified electromagnetic model of the individual component, conduct conduction impedance simulation, obtain the conduction impedance at both ends of the individual component, and record the conduction impedances F1=35mΩ, F2=1000mΩ, and F3=480mΩ at both ends of the three individual components. Adjust the simplified electromagnetic model of the individual component so that the conduction impedance at both ends of the individual component obtained by the conduction impedance simulation is consistent with the conduction impedance at both ends of the individual component on the fuel tank obtained by the test. Among them, the conductivity of the simplified electromagnetic model corresponding to F1 and F2 increases, and the conductivity of the simplified electromagnetic model corresponding to F3 decreases. Finally, F1=35mΩ, F2=1000mΩ, and F3=480mΩ are obtained.

[0028] Step 7: Build a preliminary electromagnetic prototype of the fuel tank using simplified electromagnetic models of adjacent fastening bolts, simplified electromagnetic models of adjacent components, and simplified electromagnetic models of individual components.

[0029] Step 8: Test and obtain the conduction impedance between non-adjacent components on the fuel tank. The conduction impedance between three pairs of non-adjacent components is recorded as G1=400mΩ, G2=9mΩ, and G3=5mΩ.

[0030] Step 9. Conductive impedance simulation is performed using the preliminary electromagnetic prototype to obtain the conductive impedance between non-adjacent components. The conductive impedance between three pairs of non-adjacent components is recorded as H1=450mΩ, H2=7mΩ, and H3=4mΩ. According to the three-dimensional distribution diagram of conductive impedance, the conductivity of the area where the conductive impedance changes faster in the preliminary electromagnetic prototype is adjusted so that the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test do not deviate by more than a first set threshold value, which can be specifically 5%. Finally, H1=418mΩ, H2=7.3mΩ, and H3=3.9mΩ are obtained.

[0031] Step 10: Adjust the components whose conductivity is changed in the preliminary electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed a second set value, which can be specifically 20%, and the deviation between the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed a third set threshold, which can be specifically 10%. Optimize the preliminary electromagnetic prototype to obtain an intermediate electromagnetic prototype of the fuel tank, in which the conductivity of a component related to the D1 simulation value is changed, and finally D1=65mΩ, H1=413mΩ, H2=7.2mΩ, and H3=3.7mΩ.

[0032] Step 11: Test and obtain the conduction impedance at both ends of the fuel tank box section, and record the conduction impedances S1=9mΩ and S2=5mΩ at both ends of the two fuel tank box sections.

[0033] Step 12: Use the intermediate electromagnetic prototype to carry out conduction impedance simulation to obtain the conduction impedance at both ends of the box segment. The conduction impedances at both ends of the two fuel tank box segments are recorded as T1=7.6mΩ and T2=4.2mΩ. According to the three-dimensional distribution diagram of conduction impedance, adjust the conductivity of the area where the conduction impedance changes faster in the intermediate electromagnetic prototype so that the conduction impedance at both ends of the box segment obtained by the conduction impedance simulation and the conduction impedance at both ends of the fuel tank box segment obtained by the test do not exceed the fourth set threshold value. The fourth set threshold value can be specifically 10%, and finally T1=8.1mΩ and T2=3.8mΩ.

[0034] Step 13: Adjust the components with changed conductivity in the intermediate electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed the fifth set value, which can be specifically 20%, so that the deviation between the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed the sixth set threshold, which can be specifically 20%, and the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test does not exceed the seventh set threshold, which can be specifically 15%. Optimize the intermediate electromagnetic prototype to obtain the final electromagnetic prototype of the fuel tank, wherein the conductivity of a component related to the simulation values ​​of D2 and D3 is changed, and finally D2=150mΩ, D3=260mΩ, H1=425mΩ, H2=8.1mΩ, H3=4.2mΩ, T1=8.5mΩ, T2=4.3mΩ.

[0035] Using the final electromagnetic prototype of the fuel tank, the conduction impedance between the components or points that are missing in the test data but required can be simulated, and Z1=65mΩ and Z2=530mΩ are recorded.

[0036] In the method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance disclosed in the above embodiment, the first set threshold value < the third set threshold value < the sixth set threshold value, the fourth set threshold value < the seventh set threshold value, and the first set threshold value < the fourth set threshold value, the third set threshold value < the seventh set threshold value < the sixth set threshold value, and the second set value = the fifth set value >= the sixth set threshold value, and the specific values ​​should all be less than 50%, so that the final electromagnetic prototype of the fuel tank can be easily adjusted and the simulation accuracy of the final electromagnetic prototype can be guaranteed.

[0037] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance, characterized in that: include: Step 1: Test and obtain the conduction impedance between adjacent fastening bolts on the fuel tank; Step 2: construct a simplified electromagnetic model of adjacent fastening bolts, conduct conduction impedance simulation, obtain the conduction impedance between adjacent fastening bolts, and adjust the simplified electromagnetic model of adjacent fastening bolts so that the conduction impedance between adjacent fastening bolts obtained by the conduction impedance simulation is consistent with the conduction impedance between adjacent fastening bolts on the fuel tank box section obtained by the test; Step 3: Test and obtain the conduction impedance between adjacent components on the fuel tank; Step 4: construct a simplified electromagnetic model of adjacent components, conduct a conduction impedance simulation, obtain the conduction impedance of the adjacent components, and adjust the simplified electromagnetic model of the adjacent components so that the conduction impedance of the adjacent components obtained by the conduction impedance simulation is consistent with the conduction impedance between the adjacent components on the fuel tank obtained by the test; Step 5: Test and obtain the conduction impedance of the two ends of the separate component on the fuel tank, wherein the separate component refers to a component that can be removed from the fuel tank box section; Step 6: construct a simplified electromagnetic model of the individual component, conduct a conduction impedance simulation, obtain the conduction impedance at both ends of the individual component, and adjust the simplified electromagnetic model of the individual component so that the conduction impedance at both ends of the individual component obtained by the conduction impedance simulation is consistent with the conduction impedance at both ends of the individual component on the fuel tank obtained by the test; Step 7: Using the simplified electromagnetic models of adjacent fastening bolts, the simplified electromagnetic models of adjacent components, and the simplified electromagnetic models of individual components, a preliminary electromagnetic prototype of the fuel tank is constructed; Step 8: Test and obtain the conduction impedance between non-adjacent components on the fuel tank; Step 9: Using the preliminary electromagnetic prototype, conduct a conduction impedance simulation to obtain the conduction impedance between non-adjacent components, and adjust the local conductivity of the preliminary electromagnetic prototype so that the conduction impedance between non-adjacent components obtained by the conduction impedance simulation and the conduction impedance between non-adjacent components on the fuel tank obtained by the test do not deviate by more than a first set threshold; Step 10: Adjust the components with changed conductivity in the preliminary electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed the second set value, and the deviation between the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed the third set threshold, thereby obtaining an intermediate electromagnetic prototype of the fuel tank; Step 11: Test and obtain the conduction impedance at both ends of the fuel tank box section; Step 12: Use the intermediate electromagnetic prototype to carry out conduction impedance simulation to obtain the conduction impedance at both ends of the box segment, and adjust the local conductivity of the intermediate electromagnetic prototype so that the conduction impedance at both ends of the box segment obtained by the conduction impedance simulation and the conduction impedance at both ends of the fuel tank box segment obtained by the test do not deviate by more than a fourth set threshold; Step 13: Adjust the components with changed conductivity in the intermediate electromagnetic prototype so that the deviation between the conductive impedance of adjacent components obtained by conductive impedance simulation and the conductive impedance between adjacent components on the fuel tank obtained by test does not exceed the fifth set value, the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by test does not exceed the sixth set threshold, and the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test does not exceed the seventh set threshold, so as to obtain the final electromagnetic prototype of the fuel tank.

2. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 1, characterized in that: In step five and step six, the individual parts include skin panels and pipelines.

3. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 1, characterized in that: In step nine, the local conductivity of the preliminary electromagnetic prototype is adjusted so that the conduction impedance between non-adjacent components obtained by conduction impedance simulation and the conduction impedance between non-adjacent components on the fuel tank obtained by test do not deviate by more than a first set threshold, specifically: According to the three-dimensional distribution diagram of conductive impedance, the conductivity of the area where the conductive impedance changes faster in the preliminary electromagnetic prototype is adjusted so that the conductive impedance between non-adjacent components obtained by conductive impedance simulation and the conductive impedance between non-adjacent components on the fuel tank obtained by testing do not exceed a first set threshold.

4. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 1, characterized in that: In step 12, the local conductivity of the intermediate electromagnetic prototype is adjusted so that the conduction impedance at both ends of the box segment obtained by the conduction impedance simulation and the conduction impedance at both ends of the fuel tank box segment obtained by the test do not deviate by more than a fourth set threshold, specifically: The conductivity of the region where the conductive impedance changes faster in the intermediate electromagnetic prototype is adjusted so that the conductive impedance at both ends of the box segment obtained by conductive impedance simulation and the conductive impedance at both ends of the fuel tank box segment obtained by test do not deviate by more than a fourth set threshold.

5. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 1, characterized in that: The first set threshold value < the third set threshold value < the sixth set threshold value; The fourth set threshold value < the seventh set threshold value; The first set threshold value < the fourth set threshold value, the third set threshold value < the seventh set threshold value < the sixth set threshold value; The second set value=the fifth set value>=the sixth set threshold value.

6. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 5, characterized in that: The first set threshold is specifically 5%; The third setting value is specifically 10%; The sixth set value is specifically 20%.

7. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 6, characterized in that: The fourth set threshold is specifically 10%; The seventh setting threshold is specifically 15%.

8. The method for constructing an electromagnetic prototype of an aircraft fuel tank based on conductive impedance according to claim 7, characterized in that: The second set value and the fifth set value are specifically 20%.

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