Troubleshooting method for functional test of aircraft fuel system

Abstract

The present application belongs to the technical field of aviation aircraft fuel system test, and relates to a method for troubleshooting of functional test of aircraft fuel system. Compared with the troubleshooting method of traditional fuel system functional test, it can be found that the traditional method greatly depends on manual operation, needs to judge the fault reason by manual operation, is low in efficiency, and seriously affects the delivery rhythm and overall delivery cycle of products. With the fault library function of the fault troubleshooting test bench storage module, new employees can be conveniently trained and skilled, and compared with the traditional teacher-student mode, the knowledge inheritance work can be more standardized and professional. The fault troubleshooting test bench can improve the automation, intelligence and informatization level of troubleshooting work, speed up the product research and production efficiency, and further improve the economic benefit of the company.

Description

Technical Field

[0001] This invention belongs to the field of aircraft fuel system testing technology, and relates to a method for troubleshooting functional test faults in aircraft fuel systems. Background Technology

[0002] Aircraft fuel tanks contain crucial functional components and conduits for the fuel system. Their main functions include fuel supply, fuel transfer, heat dissipation, venting and pressurization, and fuel pressurization. The proper functioning of the aircraft fuel system has a significant impact on flight safety. Therefore, functional checks of these critical components are necessary during the assembly phase to eliminate potential safety hazards. During fuel system functional testing, abnormal situations often arise, causing production stoppages and resulting in economic losses. Therefore, the ability to quickly and accurately troubleshoot fuel system test failures is of paramount importance.

[0003] Traditional troubleshooting methods mainly include the following aspects: checking the connections of the fuel system to ensure there are no loose connections or leaks; checking the operation of the fuel system components, including whether the power supply is correct and whether the components themselves function normally, judging by whether there is any intentional or abnormal vibration; checking the condition of the fuel filter or pipelines to ensure that the fuel filter and pipelines are unobstructed and free from abnormal blockages or contamination; checking the fuel tank's sealing performance to ensure that there are no leaks in the fuel tank structure, fasteners, or mating joints; and checking the test bench to ensure that the instruments and pipelines on the test bench are functioning normally.

[0004] The aforementioned troubleshooting work was entirely carried out through manual inspection. However, manual troubleshooting methods have certain limitations and drawbacks: Traditional methods rely on manual observation and judgment during the inspection process, making them susceptible to human factors, which may lead to oversights or misjudgments, resulting in problems not being identified and resolved in a timely manner; they are inefficient, as traditional methods typically require checking different functions and components one by one, consuming time and effort, and resulting in relatively long maintenance cycles, especially noticeable for fuel systems of complex products; they lack preventative inspection, as traditional methods mainly involve inspection after problems occur, failing to meet the needs of proactive maintenance and repair, which may lead to potential faults not being discovered and resolved in a timely manner; they are difficult to locate hidden faults, as traditional methods struggle to accurately locate and identify hidden faults during the inspection process, especially when dealing with complex fuel system structures and operating principles; they lack traceability and recordability, as the inspection process and results of traditional methods are often not detailed or complete enough, making it difficult to record and trace, and providing limited support for subsequent analysis and improvement; and they have poor personnel replaceability, as traditional methods require operators to possess certain professional knowledge and skills, making it difficult for non-professionals to conduct effective troubleshooting and repairs.

[0005] In view of the above background and conditions, this invention proposes an intelligent troubleshooting method for functional testing of aircraft fuel systems. This method is based on a dedicated test bench and computer for functional testing of fuel systems, and it has the following advantages and functions:

[0006] Data-driven monitoring: Utilizing advanced sensors and data acquisition equipment, the operating status of the fuel system is monitored and recorded in real time. By analyzing the collected data, problems can be quickly located, reducing troubleshooting time and effort.

[0007] Automated troubleshooting: Utilizing electronic control units and diagnostic tools, automated troubleshooting and fault diagnosis of the fuel system are achieved. These tools can automatically detect faults based on system settings and models, and provide timely feedback to help operators identify problems and offer corresponding troubleshooting suggestions.

[0008] Simulation tests: Using simulation technology and combining it with an importable physical model of the product, simulation tests are conducted to simulate various operating conditions and fault scenarios, evaluate the functional stability of the fuel system, and verify the corresponding troubleshooting methods.

[0009] Method management and inheritance: Establish a fault database to collect and organize troubleshooting experience and solutions for fuel system faults. By comparing test results with parameters in the fault database, technicians can find solutions to problems more quickly, improving the efficiency and accuracy of troubleshooting. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention provides a method for troubleshooting functional test faults in aircraft fuel systems.

[0011] The technical solution of the present invention is as follows:

[0012] Troubleshooting methods for functional tests of aircraft fuel systems, the steps are as follows:

[0013] Step 1: Before the test, inspect the test bench to ensure the cleanliness of the inside and outside of the test bench shell, the internal pipelines and external components; verify that the pressure gauge has exceeded its scheduled maintenance period; confirm the display screen, etc.; confirm that rubber hoses and other life-use parts are within their expiration dates; check for oil leaks or drips in the pressure pipeline system; check the hose connections for good condition and for any damage such as folds, aging, or cracks in the hoses; check the tightness of the fasteners on the test bench.

[0014] Step 2: Before connecting to the test bench, complete the following preparations: reliably connect one end of the static electricity grounding wire to the test bench and the other end to the grounding stake in the test site; check that the switch and lever are in the closed position; remove the hose plug, wipe the hose joint clean with a white cloth, and visually inspect it to ensure that there is no obvious dirt or white cloth fiber residue.

[0015] Step 3: According to the test requirements, connect the product to the test bench using a reducing coupling and a flexible hose;

[0016] Step 4: Press the main power button on the test control panel to start the test bench. After confirming that the test pressure gauge is in the zero state, adjust the test bench to the fault analysis mode through the keyboard, and then input the time and pressure parameters through the keyboard and data interface.

[0017] Step 5: Open the test start / stop lever. If there is overpressure, the pressure sensor will send an electrical signal to the electronically controlled pressure relief valve, causing the test bench to automatically complete the pressure relief. If the electronic device fails, the operator needs to push the pressure relief lever to complete the pressure relief, stop the test, and readjust the product status.

[0018] Step Six: Confirm that the input pressure value of the product is within the required range. After receiving the electrical signal from the pressure sensor, the electric ball valve will automatically turn on. At this time, observe the pressure value in the pipeline through the test pressure gauge and conduct the test normally according to the product test requirements. Abnormal pressure and time parameters generated during the process will be transmitted to the data processor by the timing pressure sensor. After receiving the abnormal information, the data processor will analyze it with the correct test procedure, pipeline model, and AI simulation learning data to identify the structural parts or finished products that may cause the failure. The results will be displayed on the digital display screen. After observing the information, the operator will push the pressure relief lever to complete the pressure relief, push the test start / stop lever to stop the test, and readjust the product status. After the adjustment is completed, repeat the above steps to conduct the test until the fault is eliminated.

[0019] Step 7: After the test, complete the depressurization process, close the lever, press the main power button, and turn off the test bench;

[0020] Step 8: Disconnect the hose from the product and the test bench, ensuring there is no residual oil in the hose; wrap each end of the hose and each connector on the test bench with protective cloth, and roll it up and put it into the storage cabinet; disconnect the grounding wire from the grounding stake of the test bench and the test site, and roll it up and put it into the storage cabinet; clean the test bench's control panel and outer surface.

[0021] This invention primarily utilizes digital modules and units such as sensors, AI learning devices, and data processors to improve existing test benches, enabling automated troubleshooting, fault diagnosis, and simulation testing. The test bench mainly consists of a data acquisition section, a fault analysis section, a simulation testing section, and a mechanical structure section. The data acquisition section mainly includes components such as a variable diameter flared connector, multi-diameter combination hoses, a main power button, a test start / stop lever, a fuel filter, a pressure sensor, an electronically controlled pressure relief valve, a pressure relief lever, an electronically controlled ball valve, and a test pressure gauge. Its main function is to collect and monitor the internal pressure of the product. The variable diameter flared connector is the connecting component of this invention, mainly available in three forms: variable diameter flared tee connector, variable diameter flared straight pipe connector, and variable diameter flared right-angle pipe connector. The multi-diameter combination hose is the transmission component of this invention. Through the combination of multi-diameter hoses, variable diameter flared plugs, right-angle pipe connectors, straight pipe connectors, and tee connectors, the test bench achieves compatibility with pipes and sensor ports of different diameters, supporting the connection of multiple models and types of sensor pressure sources. The main power button is the power control device of this invention, controlling the power supply to the test bench. The test start / stop lever is the control device of this invention, allowing control of test start / stop. The fuel filter is the filtration and protection device of this invention; fuel in the tank must pass through the fuel filter before entering the test device to ensure that fuel that does not meet cleanliness requirements does not enter the test bench and cause secondary contamination, thereby ensuring the reliability of the test bench. The pressure sensor is the identification and control structure of this invention; the sensor's parameter values ​​can be controlled by external input. To adapt to different test conditions and values, the pressure source entering the test bench must be within a safe detection range when the fuel pressure is transmitted and detected by the pressure sensor. The electronically controlled pressure relief valve is the control and protection device of this invention. The pressure sensor provides an electrical signal to the electronically controlled pressure relief valve to relieve pressure in the test pipeline, ensuring test safety. The pressure relief lever is the protection and control lever of this invention. When the electronic protection system of the test bench malfunctions and cannot complete pressure relief, pressure relief can be performed manually to ensure the safety of the test operation. The electronically controlled ball valve is the control device of this invention. If the pressure sensor feedback signal is within a safe range, the pressure sensor will transmit the signal to the electronically controlled ball valve, which will then be in the on state, allowing fuel pressure to be input into the test bench. If the pressure signal exceeds the safe detection range of the test bench, the electronically controlled ball valve will remain normally closed. The test pressure gauge is the display device of this invention, which detects the pressure value in the test pipeline and displays the pressure value on the electronic display screen.

[0022] The fault analysis section mainly includes a timing pressure sensor, an analysis input module, a keyboard, a data interface, a data processor, an analysis output module, and a digital display screen. Its function is to set parameters and input models according to specific tests, perform automatic detection, and feed back test parameters based on real-time test data, thereby helping operators identify faults and assisting in troubleshooting. The timing pressure sensor is the parameter acquisition device of this invention. It receives pressure and time parameter settings from the analysis input module and uses this to collect and monitor fuel system functional tests. When an abnormality occurs during the test, the timing pressure sensor feeds back the final test time and pressure value to the data module, achieving paperless information recording. The analysis input module is the parameter input device of this invention. By receiving input values ​​from the keyboard or data interface, it completes the setting of pressure and time parameters for the timing pressure sensor and inputs the test process content and pipeline model to the data processor. The keyboard is the input device of this invention. The arrow keys on the keyboard control function selection, and the number keys input pressure and time values. The data interface is the input device of this invention, which can be connected to a USB flash drive, mobile computer, etc. through interface conversion to import models and parameters. The data processor is the data storage and analysis device of this invention, which can record the test parameters of relevant experiments, realize paperless information recording, and analyze the test parameters, pipeline models and AI simulation data and output them through the analysis output module and display them on the digital display screen. The analysis output module is the data output device of this invention, which converts the data information from the data processor and displays it on the digital display screen. The digital display screen is the display device of this invention, and the operator needs to complete the information interaction with the test bench through the information on the screen.

[0023] The simulation test section mainly includes components such as a simulation input module, an AI module, a simulation output module, and a digital display screen. Its function is to conduct simulation tests using the simulation capabilities of the AI ​​module. The simulation input module, the parameter input device of this invention, receives input values ​​from the keyboard or data interface to complete the setting of various test parameters for the AI ​​module and the import of pipeline models. The AI ​​module, the simulation device of this invention, after receiving the test parameters, models, and pipeline models from the simulation input module, can conduct simulation experiments, simulating various working conditions and fault scenarios, identifying potential fault risks in advance, verifying troubleshooting methods, and outputting information through the simulation output module. The simulation output module, the data output device of this invention, converts data information from the AI ​​module, displays it on the digital display screen, and transmits the information to the data processor for storage and processing. The digital display screen, the display device of this invention, allows operators to interact with the test bench through the information on the screen.

[0024] The mechanical structure is the basic structure of this device, mainly including the test bench housing, nameplate, wheels, protective cover, and storage cabinet. The test bench housing is the external protective structure of the test bench, serving to support its shape and house internal piping and finished products. The nameplate is the display identifier, labeling the instruments on the control panel for easy identification by operators. The test bench wheels are the mobility structure, facilitating quick movement of the test bench. The protective cover is the protective and dustproof structure; it is opened during testing and closed afterward, protecting the control panel and instruments. The storage cabinet is the storage structure of the device; its pull-out design eliminates the need for externally attached hoses, allowing the test bench hoses and connectors to be directly stored inside the test bench for protection.

[0025] The beneficial effects of this invention are:

[0026] Comparing traditional troubleshooting methods for fuel system functional testing reveals that these methods heavily rely on manual operation, requiring manual diagnosis of fault causes, resulting in low efficiency and significantly impacting product delivery timelines and overall delivery cycles. By leveraging the fault database function of the troubleshooting test bench's storage module, new employees can easily learn and become proficient, achieving a more standardized and professional knowledge transfer compared to the traditional apprenticeship model. The troubleshooting test bench can improve the automation, intelligence, and informatization of troubleshooting work, accelerate product research and production efficiency, and ultimately improve the company's economic benefits. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a fuel system functional test troubleshooting test bench;

[0028] Figure 2 This is an external view of the fuel system functional test troubleshooting test bench;

[0029] Figure 3 This is a side view of the fuel system functional test troubleshooting test bench.

[0030] In the diagram, solid lines represent pressure sources, dashed lines represent electrical signals, and the following components are included: 1. Variable diameter flared connector; 2. Hoses; 3. Main power button; 4. Test start / stop lever; 5. Fuel filter; 6. Pressure sensor; 7. Electrically controlled pressure relief valve; 8. Pressure relief lever; 9. Electrically controlled ball valve; 10. Test pressure gauge; 11. Timing pressure sensor; 12. Analysis input module; 13. Keyboard; 14. Data interface; 15. Data processor; 16. Analysis output module; 17. Digital display screen (analysis); 18. Analog input module; 19. AI module; 20. Analog output module; 21. Digital display screen (analog); 22. Test bench housing; 23. Nameplate; 24. Moving wheels; 25. Protective cover; 26. Storage cabinet. Detailed Implementation

[0031] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is based on the technical solution of the invention and provides detailed implementation methods and specific implementation processes. However, the scope of protection of the present invention is not limited to the following implementation examples.

[0032] Example 1:

[0033] Troubleshooting methods for functional tests of aircraft fuel systems, the steps are as follows:

[0034] Step 1: Before the test, inspect the test bench to ensure the cleanliness of the inside and outside of the test bench shell, the internal pipelines and external components; verify that the pressure gauge has exceeded its scheduled maintenance period; confirm the display screen, etc.; confirm that rubber hoses and other life-use parts are within their expiration dates; check for oil leaks or drips in the pressure pipeline system; check the hose connections for good condition and for any damage such as folds, aging, or cracks in the hoses; check the tightness of the fasteners on the test bench.

[0035] Step 2: Before connecting to the test bench, complete the following preparations: reliably connect one end of the static electricity grounding wire to the test bench and the other end to the grounding stake in the test site; check that the switch and lever are in the closed position; remove the hose plug, wipe the hose joint clean with a white cloth, and visually inspect it to ensure that there is no obvious dirt or white cloth fiber residue.

[0036] Step 3: According to the test requirements, connect the product to the test bench using a reducing coupling and a flexible hose;

[0037] Step 4: Press the main power button 3 on the test control panel to start the test bench. After confirming that the test pressure gauge 10 is in the zero state, adjust the test bench to the fault analysis mode through the keyboard 13, and then input the time and pressure parameters through the keyboard 13 and the data interface 14.

[0038] Step 5: Open the test start / stop lever 4. If there is overpressure, the pressure sensor 6 will send an electrical signal to the electronically controlled pressure relief valve 7, causing the test bench to automatically complete the pressure relief work. If the electronic device fails, the operator needs to push the pressure relief lever 8 to complete the pressure relief work, stop the test, and readjust the product status.

[0039] Step Six: Confirm that the pressure value input by the product is within the required range. After receiving the electrical signal from the pressure sensor 6, the electric ball valve 9 will automatically turn on. At this time, observe the pressure value in the pipeline through the test pressure gauge 10 and conduct the test normally according to the product test requirements. Abnormal pressure and time parameters generated during the process will be transmitted to the data processor 15 by the timing pressure sensor 11. After receiving the abnormal information, the data processor 15 will analyze it with the correct test process, pipeline model, and AI simulation learning data to identify the possible faulty structure or finished product. The results will be displayed on the digital display screen 17. After observing the information, the operator will push the pressure relief lever 12 to complete the pressure relief, push the test start / stop lever 9 to stop the test, and readjust the product status. After the adjustment is completed, repeat the above steps to conduct the test until the fault is eliminated.

[0040] Step 7: After the test, complete the depressurization process, close levers 4 and 8, press main power button 3, and turn off the test bench;

[0041] Step 8: Disconnect the hose from the product and the test bench, ensuring there is no residual oil in the hose; wrap each end of the hose and each connector on the test bench with protective cloth, and roll it up and put it into the storage cabinet; disconnect the grounding wire from the grounding stake of the test bench and the test site, and roll it up and put it into the storage cabinet; clean the test bench's control panel and outer surface.

[0042] Example 2:

[0043] Case study of new product simulation test implementation:

[0044] Step 1: Before connecting to the test bench, complete the following preparations: reliably connect one end of the static electricity grounding wire to the test bench and the other end to the grounding stake in the test site; check that the switch and lever are in the closed position.

[0045] Step 2: Press the main power button 3 on the test control console to start the test bench;

[0046] Step 3: Adjust the test bench to simulation test mode using keyboard 13, then input the test parameters and pipeline model into the AI ​​module through keyboard 13 and data interface 14 to start AI simulation learning until no more fault models are generated. Then check whether the simulation data is correctly stored in AI module 19 through digital display screen analysis 17. After confirming that the storage is completed, turn off the main power button 3 and shut down the test bench.

[0047] Step 4: Disconnect the static electricity grounding wire from the test bench and the grounding stake of the test site, roll it up and store it in the test bench; clean the exterior of the test equipment casing and clean the oil stains on the operation panel and display panel.

[0048] Example 3:

[0049] This invention primarily utilizes digital modules and units such as sensors, AI learning devices, and data processors to improve existing test benches, enabling automated troubleshooting, fault diagnosis, and simulation testing. The test bench mainly consists of a data acquisition section, a fault analysis section, a simulation testing section, and a mechanical structure section. The data acquisition section mainly includes components such as a variable diameter flared connector 1, a multi-diameter combination hose 2, a main power button 3, a test start / stop lever 4, a fuel filter 5, a pressure sensor 6, an electronically controlled pressure relief valve 7, a pressure relief lever 8, an electronically controlled ball valve 9, and a test pressure gauge 10. Its main function is to collect and monitor the internal pressure of the product. The variable diameter flared connector 1 is the connecting component of this invention, mainly available in three forms: variable diameter flared tee connector, variable diameter flared straight pipe connector, and variable diameter flared right-angle pipe connector. The multi-diameter combination hose 2 is the transmission component of this invention. Through the combination of multi-diameter hoses, variable diameter flared plugs, right-angle pipe connectors, straight pipe connectors, and tee connectors, the test bench achieves compatibility with pipes and sensor ports of different diameters, supporting the connection of multiple models and types of sensor pressure sources. The main power button 3 is the power control device of this invention, controlling the power supply to the test bench. The test start / stop lever 4 is the control device of this invention, allowing control of test start / stop. The fuel filter 5 is the filtration and protection device of this invention; fuel in the tank must pass through the fuel filter before entering the test device to ensure that fuel that does not meet cleanliness requirements does not enter the test bench and cause secondary pollution, thereby ensuring the reliability of the test bench. The pressure sensor 6 is the identification and control structure of this invention; the sensor's parameter values ​​can be controlled by external input. To adapt to different test conditions and values, the pressure source entering the test bench must be within a safe detection range when the fuel pressure is transmitted and detected by the pressure sensor. The electronically controlled pressure relief valve 7 is the control and protection device of this invention. The pressure sensor provides an electrical signal to the electronically controlled pressure relief valve to relieve pressure in the test pipeline, ensuring test safety. The pressure relief lever 8 is the protection and control lever of this invention. When the electronic protection system of the test bench malfunctions and cannot complete pressure relief, pressure relief can be performed manually to ensure the safety of the test operation. The electronically controlled ball valve 9 is the control device of this invention. If the pressure sensor feedback signal is within a safe range, the pressure sensor will transmit the signal to the electronically controlled ball valve, which will then be in the on state, allowing fuel pressure to be input into the test bench. If the pressure signal exceeds the safe detection range of the test bench, the electronically controlled ball valve will remain normally closed. The test pressure gauge 10 is the display device of this invention, which detects the pressure value in the test pipeline and displays the pressure value on the electronic display screen.

[0050] The fault analysis section mainly includes a timing pressure sensor 11, an analysis input module 12, a keyboard 13, a data interface 14, a data processor 15, an analysis output module 16, and a digital display screen 17. Its function is to set parameters and input models according to specific tests, perform automatic detection, and feed back test parameters based on real-time test data, thereby helping operators identify faults and assisting them in troubleshooting. The timing pressure sensor 11 is the parameter acquisition device of this invention. It receives pressure and time parameter settings from the analysis input module 12 and uses this to collect and monitor fuel system functional tests. When an abnormality occurs during the test, the timing pressure sensor 11 feeds back the final test time and pressure value to the data module, achieving paperless information recording. The analysis input module 12 is the parameter input device of this invention. By receiving input values ​​from the keyboard 13 or the data interface 14, it completes the setting of pressure and time parameters for the timing pressure sensor 11 and inputs the test process content and pipeline model to the data processor 15. The keyboard 13 is the input device of this invention. The directional keys on the keyboard control function selection, and the number keys input pressure and time values. The input, data interface 14, is the input device of this invention. It can be connected to a USB flash drive, mobile computer, etc. through interface conversion to import models and parameters. The data processor 15 is the data storage and analysis device of this invention. It can record the test parameters of relevant experiments, realize paperless information recording, and analyze the test parameters, pipeline models and AI simulation data. After analysis, it outputs the data through the analysis output module 16 and displays it through the digital display screen analysis 17. The analysis output module 16 is the data output device of this invention. It converts the data information from the data processor 15 and displays it through the digital display screen analysis 17. The digital display screen analysis 17 is the display device of this invention. The operator needs to complete the information interaction with the test bench through the information on the screen.

[0051] The simulation test section mainly includes components such as the simulation input module 18, the AI ​​module 19, the simulation output module 20, and the digital display screen simulation 21. Its function is to conduct simulation tests using the simulation function of the AI ​​module. The simulation input module 18 is the parameter input device of this invention. By receiving input values ​​from the keyboard 13 or the data interface 14, it completes the setting of various test parameters and the import of pipeline models for the AI ​​module 19. The AI ​​module 19 is the simulation device of this invention. After receiving the test parameters, models, and pipeline models from the simulation input module 18, it can conduct simulation experiments, simulate various working conditions and fault situations, identify fault risk points in advance, verify troubleshooting methods, and output information through the simulation output module 20. The simulation output module 20 is the data output device of this invention. It converts the data information from the AI ​​module 19, displays it through the digital display screen simulation 21, and transmits the information to the data processor 15 for storage and processing. The digital display screen simulation 21 is the display device of this invention. Operators need to complete information interaction with the test bench through the information on the screen.

[0052] The mechanical structure is the basic structure of this device, mainly including the test bench housing 22, nameplate 23, wheels 24, protective cover 25, and storage cabinet 26. The test bench housing 22 is the external protective structure of the test bench, supporting its shape and housing internal pipes and finished products. The nameplate 23 is the display identifier, labeling the instruments on the control panel for easy identification by operators. The test bench wheels 24 are the mobility structure, facilitating quick relocation of the test bench. The protective cover 23 is the protective and dustproof structure; it is opened during testing and closed afterward, protecting the control panel and instruments. The storage cabinet 26 is the storage structure of the invention; its pull-out design eliminates the need for externally attached hoses, allowing the test bench hoses and connectors to be directly stored inside the test bench for protection.

Claims

1. A method for troubleshooting functional tests of an aircraft fuel system, characterized in that, The steps are as follows: Step 1: Before the test, inspect the test bench to ensure that the inside and outside of the test bench shell, the internal pipelines and the outside of the components are clean. Step 2: Before connecting to the test bench, complete the following preparations: reliably connect one end of the static electricity grounding wire to the test bench and the other end to the grounding stake in the test site; check that the switch and lever are in the closed position. Step 3: According to the test requirements, connect the product to the test bench using a reducing coupling and a flexible hose; Step 4: Press the main power button (3) on the test control panel to start the test bench. After confirming that the test pressure gauge (10) is in the zero state, adjust the test bench to the fault analysis mode through the keyboard (13), and then input the time and pressure parameters through the keyboard (13) and data interface (14). Step 5: Open the test start / stop lever (4). If there is overpressure, the pressure sensor (6) will send an electrical signal to the electrically controlled pressure relief valve (7) so that the test bench can automatically complete the pressure relief work. If the electronic device fails, the operator needs to push the pressure relief lever (8) to complete the pressure relief work, stop the test, and readjust the product status. Step 6: Confirm that the pressure value input by the product is within the required range. After the electric ball valve (9) receives the electrical signal from the pressure sensor (6), it will automatically turn on. At this time, observe the pressure value in the pipeline through the test pressure gauge (10) and conduct the test normally according to the product test requirements. Abnormal pressure and time parameters generated during the process will be transmitted to the data processor (15) by the timing pressure sensor (11). After receiving the abnormal information, the data processor (15) will analyze the possible faulty structure or finished product with the correct test process, pipeline model, and AI simulation learning data, and display it through the digital display screen (analysis) (17). After the operator observes the information, push the pressure relief lever (8) to complete the pressure relief, push the test start / stop lever (4) to stop the test, and readjust the product status. After the adjustment is completed, repeat the above steps to carry out the test until the fault is eliminated. Step 7: After the test, complete the depressurization work, close the test start / stop lever (4) and the depressurization lever (8), press the main power button (3), and shut down the test bench; The test bench includes a data acquisition section, a fault analysis section, a simulation test section, and a mechanical structure section; The data acquisition section includes a variable diameter flared connector (1), a multi-diameter combination hose (2), a main power button (3), a test start / stop lever (4), a fuel filter (5), a pressure sensor (6), an electronically controlled pressure relief valve (7), a pressure relief lever (8), an electronically controlled ball valve (9), and a test pressure gauge (10). The variable diameter flared connector (1) is a connecting component, including three forms: a variable diameter flared tee connector, a variable diameter flared straight pipe connector, and a variable diameter flared right-angle pipe connector. The multi-diameter combination hose (2) is connected by a multi-diameter hose, a variable diameter flared plug, a right-angle pipe connector, a straight pipe connector, and a tee connector. The test bench is compatible with pipes and sensor ports of different diameters and supports the access of multiple models and types of sensor pressure sources. The main power button (3) controls the power supply of the test bench. The test start / stop lever (4) can control the start and stop of the test. The fuel in the tank needs to be filtered by the fuel filter (5) before entering the test device. The parameter value of the pressure sensor (6) can be controlled and changed by external input to ensure that it can adapt to test conditions with different test values. The pressure sensor (6) gives the electrical signal to the electrically controlled pressure relief valve (7) to depressurize the test pipeline in order to ensure the safety of the test. The fault analysis section includes a timing pressure sensor (11), an analysis input module (12), a keyboard (13), a data interface (14), a data processor (15), an analysis output module (16), and a digital display screen (analysis) (17). Its function is to set parameters and input models according to specific experiments, and to perform automatic detection. It also provides feedback on experimental parameters based on real-time experimental data, thereby helping operators to find faults and assisting them in troubleshooting. The timing pressure sensor (11) receives pressure and time parameter settings from the analysis input module (12). The analysis input module (12) completes the setting of pressure and time parameters of the timing pressure sensor (11) by receiving input values ​​from the keyboard (13) or the data interface (14), and inputs the experimental process content and pipeline model to the data processor (15). The simulation test section mainly includes a simulation input module (18), an AI module (19), a simulation output module (20), and a digital display screen (simulation) (21). Its function is to conduct simulation tests using the simulation function of the AI ​​module. The mechanical structure is the basic structure of this device, mainly including the test bench box (22), nameplate (23), moving wheels (24), protective cover plate (25), and storage cabinet (26).

2. The troubleshooting method for functional testing of an aircraft fuel system as described in claim 1, characterized in that, The pressure relief lever (8) is a protection and control lever, and the electric ball valve (9) is a control device. If the pressure sensor feedback signal is within the safe range, the pressure sensor will transmit the signal to the electric ball valve (9). At this time, the electric ball valve (9) will be in the on state and allow fuel pressure to be input into the test bench. If the pressure signal exceeds the safe range detected by the test bench, the electric ball valve (9) will remain in the normally closed state. The test pressure gauge (10) is a display device that detects the pressure value in the test pipeline and displays the pressure value through the electronic display screen.

3. The troubleshooting method for functional testing of an aircraft fuel system as described in claim 2, characterized in that, The test bench housing (22) serves to support the external shape and accommodate the internal pipelines and finished products. The nameplate (23) is a display label. The test bench wheels (24) are a moving structure that allows operators to quickly move the test bench. The protective cover (25) is a protective and dustproof structure. The cover is opened during the test and closed after the test, thus protecting the operating table and instruments. The storage cabinet (26) is a pull-out type.

4. The troubleshooting method for functional testing of an aircraft fuel system as described in claim 3, characterized in that, The analog input module (18) parameter input device receives input values ​​from the keyboard (13) or data interface (14) to complete the setting of various test parameters of AI module (19) and the import of pipeline model. AI module (19) is a simulation device. After receiving the test parameters, model and pipeline model from analog input module (18), it can conduct simulation experiments. Analog output module (20) is a data output device. It converts the data information from AI module (19), displays it through digital display screen (simulation) (21), and transmits the information to data processor (15) for storage and processing. Digital display screen (simulation) (21) is a display device. The operator needs to complete the information interaction with the test bench through the information on the screen.

5. The troubleshooting method for functional testing of an aircraft fuel system as described in claim 4, characterized in that, The data processor (15) is a data storage and analysis device. After analysis, it outputs data through the analysis output module (16) and displays it on the digital display screen (analysis) (17). The analysis output module (16) is a data output device that converts data information from the data processor (15) and displays it on the digital display screen (analysis) (17).

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