Lightning ignition source testing device of fuel tank structure

Abstract

The utility model belongs to the technical field of lightning tests, and discloses a fuel tank structure lightning ignition source test device which comprises a camera obscura, a weak light source, a detection imaging piece, a piece to be tested and a current test piece. The weak light source and the detection imaging piece are arranged in the camera obscura, the lens hole and the test hole are oppositely arranged, the detection imaging piece is fixed in the lens hole, the piece to be tested is fixed in the test hole, and the weak light source provides necessary background light in the test process, so that the detection imaging piece can accurately capture the ignition condition of the piece to be tested; the detection imaging piece is helped to better capture the image of the ignition source, the ignition source is accurately positioned, and then the position of the ignition source is clearly detected; the detection accuracy is improved, and the safety and reliability of the fuel tank structure are accurately evaluated.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning tests, and in particular to a test device for a lightning ignition source of a fuel tank structure. Background Technique

[0002] Lightning is a natural discharge phenomenon with high voltage and large current. Civil aviation aircraft will encounter a lightning strike on average every 3,000 flight hours. The fuel tank is an important part of the aircraft, and its reliable operation will directly affect flight safety. Therefore, the fuel tank is an object that needs to be focused on for protection research in a lightning environment. When an aircraft is struck by lightning, the fuel tank will become part of the lightning path, and the lightning current will conduct on the fuel tank structure and internal pipelines, which may cause an ignition source to be generated inside the fuel tank structure, posing a threat to the flight safety of the aircraft. Therefore, it is very important to conduct lightning tests on the fuel tank structure and components to determine the location of the ignition source in the fuel tank structure.

[0003] Usually, two methods, namely the photography method and the combustible gas method, are used to detect the lightning ignition source of the fuel tank structure and components. The combustible gas method can determine whether there is an ignition source, but it cannot determine the location of the ignition source. Therefore, the photography method is often used for detection. However, due to the very short duration of the electric spark, the weak brightness of the electric spark itself, and the interference of the background light conditions, it is easy to affect the camera shooting, resulting in a low contrast of the captured image and the inability to clearly display the position of the electric spark. Therefore, it is difficult to accurately determine the location of the ignition source in the fuel tank structure, reducing the accuracy of detection, and further making it difficult to evaluate the safety and reliability of the fuel tank structure. Content of the Utility Model

[0004] The purpose of the utility model is to provide a test device for a lightning ignition source of a fuel tank structure, which can accurately find the position where the ignition source is generated, improve the accuracy of detection, and accurately evaluate the safety and reliability of the fuel tank structure.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A test device for a lightning ignition source of a fuel tank structure, which includes:

[0007] A dark box, which is provided with a lens hole and a test hole. The lens hole and the test hole are oppositely arranged on the dark box, and a weak light source is arranged inside the dark box;

[0008] A detection imaging component, which is fixed in the lens hole, and the weak light source is arranged within the imaging range of the detection imaging component;

[0009] A test piece to be measured, which is fixed in the test hole;

[0010] A current test piece, the current test piece is connected to both ends of the piece to be tested and is in series with the piece to be tested.

[0011] Furthermore, the lightning ignition source test device for a fuel tank structure further includes two conductive connectors. The two conductive connectors are arranged at both ends of the piece to be tested, and the current test piece is connected to the conductive connectors.

[0012] Furthermore, the lightning ignition source test device for a fuel tank structure further includes an insulating clamping piece, and the clamping piece clamps and fixes the piece to be tested and the conductive connectors.

[0013] Furthermore, the clamping piece is set as a bow-shaped clamp.

[0014] Furthermore, a first light-shielding piece is arranged at the connection between the test hole and the piece to be tested to ensure that the connection between the test hole and the piece to be tested is light-tight.

[0015] Furthermore, a second light-shielding piece is arranged at the connection between the lens hole and the detection imaging piece to ensure that the connection between the lens hole and the detection imaging piece is light-tight.

[0016] Furthermore, the lightning ignition source test device for a fuel tank structure further includes a thermal imager, and the thermal imager can detect the surface temperature change of the entire piece to be tested.

[0017] Furthermore, an imaging hole is formed in the dark box. The imaging hole and the lens hole are arranged on the same side of the dark box, and the thermal imager is fixed in the imaging hole.

[0018] Furthermore, the lightning ignition source test device for a fuel tank structure further includes a data acquisition system and a control system. The data acquisition system is connected to the detection imaging piece and the thermal imager, and the control system is connected to the current test piece, the detection imaging piece, and the thermal imager.

[0019] Furthermore, the lightning ignition source test device for a fuel tank structure further includes an ignition device. The ignition device has a discharge electrode, and the discharge electrode is arranged within the imaging range of the detection imaging piece.

[0020] Advantages of the present utility model:

[0021] The utility model provides a test device for the lightning ignition source of a fuel tank structure. Through the design of a dark box, it can isolate the interference of external light. A weak light source and a detection imaging component are arranged in the dark box. The lens hole and the test hole are arranged opposite to each other. The detection imaging component is fixed in the lens hole, and the component to be tested is fixed in the test hole. The weak light source provides necessary background light during the test process, which can ensure that the detection imaging component accurately captures the ignition situation of the component to be tested, helps the detection imaging component better capture the imaging of the ignition source, accurately locate the ignition source, and then clearly detect the position of the ignition source; improve the accuracy of detection, and accurately evaluate the safety and reliability of the fuel tank structure. Brief Description of the Drawings

[0022] Figure 1 is a schematic principle diagram of a test device for the lightning ignition source of a fuel tank structure according to the utility model;

[0023] Figure 2 is a schematic structural diagram of a test device for the lightning ignition source of a fuel tank structure according to the utility model;

[0024] Figure 3 is a schematic structural diagram of the component to be tested in the utility model;

[0025] In the figure:

[0026] 1, dark box; 2, weak light source; 3, detection imaging component; 4, component to be tested; 5, current test component; 6, clamping component; 7, conductive connector; 8, data acquisition system; 9, control system; 10, thermal imager. Detailed Description of the Preferred Embodiments

[0027] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0028] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0030] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] Please refer to Figures 1 - 3 As shown, the present utility model provides a test device for lightning ignition sources of a fuel tank structure, which can accurately find out the position where the ignition source is generated, improve the accuracy of detection, and accurately evaluate the safety and reliability of the fuel tank structure. A test device for lightning ignition sources of a fuel tank structure includes a dark box 1, a weak light source 2, a detection imaging member 3, a test piece 4 and a current test piece 5. A lens hole and a test hole are formed in the dark box 1. The lens hole and the test hole are oppositely arranged on the dark box 1. The weak light source 2 is arranged inside the dark box 1. The detection imaging member 3 is fixed in the lens hole, and the weak light source 2 is arranged within the imaging range of the detection imaging member 3. The test piece 4 is fixed in the test hole. The current test piece 5 is connected to both ends of the test piece 4 and is in series connection with the test piece 4.

[0032] Through the design of the dark box 1, the interference of external light can be isolated. The weak light source 2 and the detection imaging member 3 are arranged inside the dark box 1. The lens hole and the test hole are oppositely arranged. The detection imaging member 3 is fixed in the lens hole, and the test piece 4 is fixed in the test hole. The weak light source 2 provides the necessary background light during the test process, which can ensure that the detection imaging member 3 accurately captures the ignition situation of the test piece 4, helps the detection imaging member 3 better capture the imaging of the ignition source, accurately locate the ignition source, and then clearly detect the position of the ignition source, improving the accuracy of detection and accurately evaluating the safety and reliability of the fuel tank structure.

[0033] It should be noted that the dark box 1 can be made of a matte black insulating material. The matte black surface can absorb light, reduce reflection, and prevent light from reflecting inside the dark box 1 and interfering with the imaging of the detection imaging component 3, thereby improving the contrast and clarity of the imaging. At the same time, the matte black surface of the dark box 1 provides a constant and light-pollution-free test environment, ensuring the consistency of each test condition and improving the repeatability and reliability of the data. The insulating material can prevent the accumulation and discharge of static electricity, avoiding the interference of static electricity on the test piece 4 and the detection equipment. In addition, the detection imaging component 3 can be, but is not limited to, a camera, and no specific limitation is made here.

[0034] As Figure 3 shown, it should be noted that the test piece 4 in the fuel tank structure lightning ignition source test can be, but is not limited to, composed of a skin and stringers made of composite materials. The two are connected by bonding to form the test piece 4. The bonding connection can evenly distribute the load on the entire contact surface, avoid local stress concentration of the test piece 4, improve the structural strength and rigidity of the test piece 4, prevent loosening at the connection of the test piece 4 during the test project and affect the test results, and at the same time can also reduce or replace traditional fasteners (such as screws, rivets), thereby reducing the overall weight of the test piece 4 structure.

[0035] As Figure 2 shown, the current test piece 5 is connected to both ends of the test piece 4 and is in series with the test piece 4. The output end of the current test piece 5 outputs the current required for 180 μJ - 200 μJ of energy to simulate the lightning emission process. Specifically, in order to enhance the conductivity stability between the current test piece 5 and the test piece 4, in some embodiments, a fuel tank structure lightning ignition source test device further includes two conductive connectors 7. The two conductive connectors 7 are arranged at both ends of the test piece 4, and the current test piece 5 is connected to the conductive connectors 7. The conductive connector 7 is usually made of a high-conductivity material, such as an aluminum busbar, etc. The conductive connector 7 can effectively reduce the contact resistance, improve the current transmission efficiency, provide a stable current path for the test, and at the same time the conductive connector 7 is usually relatively strong, can withstand large mechanical stresses, provide a firm mechanical connection, and prevent loosening or breaking at the connection between the current test piece 5 and the test piece 4 due to vibration, movement or external forces, ensuring the stability of current transmission.

[0036] As Figure 1As shown, to maintain the stability of the conduction state between the conductive connector 7 and the device under test 4, in some embodiments, a fuel tank structure lightning ignition source test device further includes an insulating clamping member 6. The clamping member 6 clamps and fixes the device under test 4 and the conductive connector 7. By using the insulating clamping member 6, it can effectively prevent the conductive connector 7 and the device under test 4 from contacting other metal components or grounded parts, thereby avoiding the risk of short circuit; the clamping member 6 can firmly fix the conductive connector 7 and the device under test 4, preventing the two from loosening or shifting due to vibration or external force during the test, and ensuring the stability of the conduction state between the conductive connector 7 and the device under test 4; the clamping member 6 can be made of insulating material or isolated between the clamping member 6 and the conductive connector 7 and the device under test 4 through insulating pads, etc. The specific insulation method is not specifically limited; specifically, the clamping member 6 can but is not limited to using a bow-shaped clamp, which is not specifically limited here.

[0037] To ensure that the inside of the dark box 1 remains in a dark state continuously, in some embodiments, a first light-shielding member can be provided at the connection between the test hole and the device under test 4 to ensure that the connection between the test hole and the device under test 4 is light-tight. By setting the first light-shielding member, it can effectively prevent external light from entering the dark box 1 through the gap at the connection between the test hole and the device under test 4, further ensuring that the inside of the dark box 1 remains in a dark state continuously. The first light-shielding member can but is not limited to using light-shielding cloth or light-shielding sealing strips, which is not specifically limited here; if light-shielding cloth is selected, the light-shielding cloth can be covered at the connection between the test hole and the device under test 4 to ensure that the inside of the dark box 1 is in a dark state; if a light-shielding sealing strip is used, a sealing strip can be provided between the test hole and the device under test 4, and the sealing strip can fill the gap, making the inside of the dark box 1 in a dark state. In other embodiments, a second light-shielding member is provided at the connection between the lens hole and the detection imaging member 3 to ensure that the connection between the lens hole and the detection imaging member 3 is light-tight. The second light-shielding member can prevent external light from entering the dark box 1 through the gap between the lens hole and the detection imaging member 3. The second light-shielding member can adopt the same light-shielding scheme as the first light-shielding member, which will not be elaborated here.

[0038] As Figure 1As shown, in some embodiments, a lightning ignition source test device for a fuel tank structure further includes a thermal imager 10. The thermal imager 10 can detect the surface temperature change of the entire test piece 4 in real time, and thus can obtain the highest temperature value of the test piece 4 reaching the ignition critical value through the lightning test, and then explore the ignition threshold of the lightning ignition source. At the same time, the thermal imager 10 combined with the detection imaging element 3 can not only accurately locate the ignition source, but also evaluate the performance and safety of the ignition source. Further, an imaging hole is provided on the dark box 1, and the imaging hole and the lens hole are arranged on the same side of the dark box 1. The thermal imager 10 is fixed in the imaging hole. By fixing the thermal imager 10 in the imaging hole, the measurement error caused by holding or moving the device can be avoided, and the accuracy and consistency of the temperature data can be ensured. In addition, arranging the imaging hole and the lens hole on the same side of the dark box 1 and opposite to the test piece 4 enables the thermal imager 10 to always detect the surface temperature change of the entire test piece 4 and keep it at the best observation angle.

[0039] Continuing as Figure 1 As shown, in order to improve the automation of the test process and reduce manual intervention, in some embodiments, a lightning ignition source test device for a fuel tank structure further includes a data acquisition system 8 and a control system 9. The data acquisition system 8 is connected to the detection imaging element 3 and the thermal imager 10, and the control system 9 is connected to the current test piece 5, the detection imaging element 3 and the thermal imager 10. Among them, the data acquisition system 8 can centrally collect the data of the detection imaging element 3 and the thermal imager 10, can process and analyze the collected data in real time, quickly obtain the experimental results, and improve the detection efficiency. The control system 9 can accurately control the working states of the current test piece 5, the detection imaging element 3 and the thermal imager 10 in real time, ensure the coordination of each device, improve the reliability of the test, can simplify the operation steps through a preset test process, reduce the operation difficulty, and improve the efficiency of test management. It should be noted that the data acquisition system 8 and the control system 9 can be connected to each device by, but not limited to, a communication connection method, and no specific limitation is made here.

[0040] In order to verify that the detection imaging component 3 can accurately and clearly capture the weak light source 2 and the test piece 4 at the same time before the test, in some embodiments, a fuel tank structure lightning ignition source test device also includes an ignition device, the ignition device has a discharge electrode, the discharge electrode can be placed in the dark box 1, and the discharge electrode is set within the imaging range of the detection imaging component 3; wherein the discharge electrode is used to simulate the discharge process during the lightning experiment, and since the discharge electrode and the weak light source 2 are both set within the imaging range of the detection imaging component 3, the detection imaging component 3 can capture both at the same time. The specific operation is: before the test officially starts, the operator can use the discharge electrode with a 200μJ pulse ignition source ignition device, put it into the dark box 1, emit electric sparks to simulate the lightning process, and test whether the detection imaging component 3 can accurately and clearly capture the electric sparks emitted by the weak light source 2 and the discharge electrode at the same time. If the captured image is blurred or none of them can be captured, it can be adjusted by adjusting the sensitivity, aperture or changing the device of the detection imaging component 3 until the detection imaging component 3 can accurately and clearly capture the electric sparks emitted by the weak light source 2 and the discharge electrode at the same time. The ignition device can help the operator evaluate in advance the performance of the fuel tank structure lightning ignition source test device under real test conditions, test the response ability of the detection imaging component 3 when processing instantaneous high-intensity light signals, pre-process the detection imaging component 3 in advance, and reduce the situation where the test results are poor due to problems with the detection imaging component 3.

[0041] The following is the specific test process for the lightning ignition source test of the fuel tank structure:

[0042] First, fix the device under test 4 in the test hole of the dark box 1, connect the current test piece 5 to both ends of the device under test 4, and connect them in series;

[0043] Secondly, the detection imaging element 3 is fixed in the lens hole opposite to the test hole of the dark box 1, and the weak light source 2 is set in the imaging range of the detection imaging element 3;

[0044] Afterwards, the detection imaging element 3 is adjusted so that the detection imaging element 3 can accurately and clearly capture the weak light source 2 and the object to be tested 4 at the same time;

[0045] Finally, check the connection status of each device. After checking that everything is correct, energize the fuel tank structure lightning ignition source test and conduct the fuel tank structure lightning ignition source test.

[0046] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A test device for lightning ignition sources of a fuel tank structure, characterized in that, Comprising: A light-tight box (1) having a lens hole and a test hole formed thereon, the lens hole and the test hole being oppositely arranged on the light-tight box (1), and a weak light source (2) being arranged inside the light-tight box (1); A detection imaging member (3) fixed inside the lens hole, and the weak light source (2) being arranged within the imaging range of the detection imaging member (3); A test piece (4) fixed inside the test hole; A current test piece (5) connected to both ends of the test piece (4) and connected in series with the test piece (4).

2. The lightning ignition source test device for a fuel tank structure according to claim 1, characterized in that, The lightning ignition source test device for a fuel tank structure further comprises two conductive connectors (7), the two conductive connectors (7) being arranged at both ends of the test piece (4), and the current test piece (5) being connected to the conductive connectors (7).

3. The lightning ignition source test device for a fuel tank structure according to claim 2, characterized in that, The lightning ignition source test device for a fuel tank structure further comprises an insulating clamping member (6) for clamping and fixing the test piece (4) and the conductive connectors (7).

4. A fuel tank structure lightning ignition source test device according to claim 3, characterized in that, The clamping member (6) is arranged as a bow-shaped clamp.

5. A lightning ignition source test device for a fuel tank structure according to claim 1, characterized in that, A first light-shielding member is arranged at the connection between the test hole and the test piece (4) to ensure that the connection between the test hole and the test piece (4) is light-tight.

6. The lightning ignition source test device for a fuel tank structure according to claim 1, characterized in that A second light-shielding member is arranged at the connection between the lens hole and the detection imaging member (3) to ensure that the connection between the lens hole and the detection imaging member (3) is light-tight.

7. A lightning ignition source test device for a fuel tank structure according to claim 1, characterized in that, The lightning ignition source test device for a fuel tank structure further comprises a thermal imager (10) capable of detecting the surface temperature change of the entire test piece (4).

8. A lightning ignition source test device for a fuel tank structure according to claim 7, characterized in that, An imaging hole is formed on the light-tight box (1), the imaging hole and the lens hole are arranged on the same side of the light-tight box (1), and the thermal imager (10) is fixed inside the imaging hole.

9. A lightning ignition source test device for a fuel tank structure according to claim 8, characterized in that, The lightning ignition source test device for a fuel tank structure further comprises a data acquisition system (8) and a control system (9), the data acquisition system (8) being connected to the detection imaging member (3) and the thermal imager (10), and the control system (9) being connected to the current test piece (5), the detection imaging member (3) and the thermal imager (10).

10. A fuel tank structure lightning ignition source test device according to any one of claims 1-9, characterized in that, The lightning ignition source test device for a fuel tank structure further comprises an ignition device having a discharge electrode arranged within the imaging range of the detection imaging member (3).

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