Airbag test equipment and method

Abstract

The present invention relates to the technical field of airbag testing, specifically an airbag test device and method, including guide rails, an airbag installation mechanism, a drop hammer, an acceleration sensor, a force sensor, a pulley rocker assembly, a damper, and a blocking assembly. A force sensor is installed below the airbag installation position of the airbag installation mechanism, a plurality of guide rails are vertically arranged around the airbag installation mechanism, a drop hammer is mounted between the plurality of guide rails, a blocking assembly is arranged on the outer side of the plurality of guide rails, a damper is arranged at the extreme position of the drop hammer's rise, and an acceleration sensor is installed on the top of the drop hammer. Compared with the prior art, the present invention can effectively measure the reverse thrust impact force on the surrounding components when the airbag is detonated, and can effectively verify the accuracy of the airbag CAE simulation model, thereby providing guidance for the structural design and production of components, which is conducive to avoiding the risks caused by unreasonable design and manufacturing as much as possible, and effectively improving the safe use performance of components.

Description

Technical Field

[0001] The invention relates to the technical field of safety airbag testing, in particular to an airbag testing device and method. Background Art

[0002] With the improvement of automobile regulations, automobile manufacturers have higher and higher requirements for airbag performance. For example, in the standards given to suppliers by a certain OEM, it is proposed that airbag suppliers should not only complete the simulation and verification of the energy absorption performance of airbags in vehicle collision conditions, but also test and verify the early stage of airbags, that is, 0ms-20ms after detonation, and the reverse thrust impact on the surrounding environment including door covers, foam, dummies, etc.

[0003] In the prior art, the methods used to test the energy absorption performance of simulated airbags in vehicle collision conditions include drop tower test and linear impact test. These two tests are more often used to test the energy absorption performance of airbags after they are fully deployed; with the improvement of automobile regulations, automobile manufacturers have higher and higher requirements for the early reverse thrust impact test of airbags on the surrounding environment, but the prior art lacks equipment for stable reverse thrust impact test of airbags.

[0004] Therefore, it is necessary to design an airbag test equipment and method to achieve stable testing of the reverse thrust impact force of the airbag. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an airbag test device and method to achieve a stable test of the reverse thrust impact force of an airbag.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an airbag test equipment, including guide rails, an airbag installation mechanism, a drop hammer, an acceleration sensor, a force sensor, a pulley rocker group, a damper, and a blocking assembly. A force sensor is installed below the airbag installation position of the airbag installation mechanism, a plurality of guide rails are vertically arranged around the airbag installation mechanism, the drop hammer is mounted between the plurality of guide rails, the edge of the drop hammer is slidably connected to the guide rails, a blocking assembly is arranged on the outer side of the plurality of guide rails, the blocking assembly is against the bottom of the drop hammer or contacts or separates from the edge of the drop hammer, a damper is arranged at the extreme position of the drop hammer's rise, an acceleration sensor is installed on the top of the drop hammer, a pulley rocker group is installed above the drop hammer, and the lifting rope of the pulley rocker group is connected or separated from the drop hammer.

[0007] The airbag installation mechanism comprises a mounting plate and a fixing component, the end of the fixing component is connected to the bottom of the mounting plate, a force sensor is arranged between the fixing component and the mounting plate, and the safety airbag to be tested is fixed on the top of the mounting plate.

[0008] The drop weight and the guide rail are connected by a bearing.

[0009] The damper comprises a hydraulic device.

[0010] The blocking assembly includes a blocking column, a movable block, and an elastic mechanism. The lower end of the movable block is connected to the blocking column by a rotating shaft, the upper end of the movable block protrudes from the surface of the blocking column, and an elastic mechanism is provided between the upper end of the movable block and the blocking column.

[0011] A heightening clamp ring is inserted on the guide rail, and the height of the heightening clamp ring matches the initial height of the drop hammer.

[0012] The data receiving ends of the acceleration sensor and the force sensor are connected to the data receiving end of the data acquisition and processing device.

[0013] The guide rail, airbag installation mechanism, pulley rocker assembly, damper and blocking assembly are installed on a support frame, and the impact resistance of the support frame is greater than the impact force when the safety airbag is detonated.

[0014] An experimental method for airbag experimental equipment comprises the following steps: step 1, connecting the lifting rope of a pulley rocker group with a drop hammer, shaking the rocker of the pulley rocker group, raising the drop hammer to a height close to a damper, and fixing the airbag in an unexploded and contracted state to an airbag installation mechanism; step 2, selecting a padding clamp ring according to the initial height of the drop hammer designed in the experiment, and inserting the padding clamp ring into a guide rail; step 3, shaking the rocker of the pulley rocker group in the opposite direction, and slowly lowering the drop hammer to contact the padding clamp ring; step 4, removing the connection between the lifting rope of the pulley rocker group and the drop hammer; step 5, detonating the airbag, and the airbag is deployed and impacts the drop hammer, and the drop hammer moves along the guide rail The airbag moves upward, the acceleration sensor measures the acceleration value of the impact of the drop hammer during the detonation process, and the force sensor measures the impact force value of the airbag during the detonation process; the data acquisition and processing device collects the impact force value and the acceleration value, and obtains the required impact force value curve and acceleration curve according to these data processing; step 6, during the upward movement of the drop hammer along the guide rail, it contacts the movable block, the movable block avoids the drop hammer, and the drop hammer continues to move upward along the guide rail; step 7, after the drop hammer is separated from the movable block, the movable block rebounds back to the initial position; step 8, the drop hammer hits the damper and then falls, the movable block catches the drop hammer, and the drop hammer movement ends.

[0015] The method also includes step 9, in which the impact force value curve and the acceleration curve are overlapped with the impact force value curve and the acceleration curve obtained by the CAE simulation model. If the overlap reaches a preset standard, the credibility of the CAE simulation model is high; if the overlap does not reach the preset standard, the credibility of the CAE simulation model is low, and the CAE simulation model is optimized or rebuilt.

[0016] Compared with the prior art, the present invention designs airbag test equipment and methods, which can effectively measure the reverse thrust impact force on surrounding components when the airbag is detonated, and can effectively verify the accuracy of the airbag CAE simulation model, thereby providing reliability and practical value guidance for the structural design and production of components, which is conducive to avoiding the risks caused by unreasonable design and manufacturing as much as possible, and effectively improving the safe use performance of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention at the experimental preparation stage, with the airbag installed and the drop weight at the initial position.

[0018] Figure 2 It is a schematic structural diagram of the installation of the airbag and force sensor of the present invention.

[0019] Figure 3 This is a schematic diagram of the overall structure of the present invention in the experimental preparation stage, when the airbag has been installed and the drop weight has fallen below the movable stopper.

[0020] Figure 4 This is a schematic diagram of the overall structure of the airbag after it is detonated during the experimental implementation stage of the present invention. DETAILED DESCRIPTION

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] See also Figure 1 The present invention provides an airbag test device, including a guide rail, an airbag installation mechanism, a drop hammer, an acceleration sensor, a force sensor, a pulley rocker group, a damper, and a blocking component. A force sensor 11 is installed below the airbag installation position of the airbag installation mechanism 4, and the force sensor 11 measures the impact force value of the airbag 13 during the detonation process. A plurality of guide rails 2 are vertically arranged around the airbag installation mechanism 4, and a drop hammer 3 is erected between the plurality of guide rails 2. The edge of the drop hammer 3 is slidably connected to the guide rails 2. A blocking component is arranged on the outer side of the plurality of guide rails 2. The blocking component abuts against the bottom of the drop hammer 3 or contacts or separates from the edge of the drop hammer 3. A damper 7 is provided at the extreme position of the rise of the drop hammer 3. An acceleration sensor 12 is installed on the top of the drop hammer 3. The acceleration sensor 12 is used to measure the acceleration value of the airbag 13 impacting the drop hammer 3 during the detonation process. A pulley rocker group 6 is installed above the drop hammer 3, and the lifting rope of the pulley rocker group 6 is connected or separated from the drop hammer 3.

[0023] The guide rail 2, the airbag installation mechanism 4, the pulley rocker assembly 6, the damper 7, and the blocking column 8 are installed on the support frame 1. The impact resistance of the support frame 1 is greater than the impact force when the airbag 13 is detonated. The support frame 1 is integrally constructed into a frame structure so that the energy released by the airbag 13 after detonation can be completely or basically limited in the device, and no deformation occurs during the explosion of the airbag 13, so that more accurate and true processing can be performed through the force sensor 11, the acceleration sensor 12 and the data acquisition and processing device.

[0024] In order to facilitate manufacturing and use, the support frame 1 is preferably an integral frame structure, and any other suitable structural form may also be adopted according to actual application requirements.

[0025] In order to make the system of the present invention more transportable or flexible, four lockable movable pulleys can be installed on the bottom surface of the supporting frame 1.

[0026] The guide rail 2 is used to constrain the running path of the drop weight 3. In this example, a total of 6 guide rails 2 and 1 drop weight 3 are arranged. The arrangement position of the drop weight 3 is suitable for the airbag 13 to expand and unfold due to its volume after the airbag 13 is detonated, thereby pushing the drop weight 3 to move along the guide rail 2. The number of guide rails 2, drop weights 3, and acceleration sensors 12 can be set according to actual needs.

[0027] In order to reduce contact friction, the guide rail 2 and the drop weight 3 are connected by bearings.

[0028] The airbag mounting mechanism 4 includes a mounting plate and a fixing component, the end of the fixing component is connected to the bottom of the mounting plate, a force sensor 11 is arranged between the fixing component and the mounting plate, the fixing component is configured as a support column, a mounting hole is arranged on the fixing component, the force sensor 11 is fixed to the fixing component via the mounting hole, and the other end of the force sensor 11 is connected to the mounting plate via another mounting hole. In this example, two force sensors 11 are arranged, and a suitable number of force sensors 11 can be arranged according to actual needs.

[0029] The mounting plate is in the shape of a circular flat plate, and a mounting hole is provided on the top of the mounting plate so as to fix the safety airbag 13 to be tested through a connecting piece. The safety airbag 13 to be tested is in an unexploded and contracted state.

[0030] A pulley rocker assembly 6 is installed above the drop hammer 3, and the lifting end of the pulley rocker assembly 6 is connected to the drop hammer 3. The rocker is rotated to raise the drop hammer 3 to a suitable position, so as to facilitate the installation of the airbag 13 on the airbag installation mechanism 4. After the airbag 13 is installed, the rocker is rotated in the opposite direction to lower the height of the drop hammer 3 to the designed position.

[0031] The damper 7 can effectively limit the displacement of the drop weight 3 impacting upward along the guide rail 2. The damper 7 includes a hydraulic device. After the airbag 13 is detonated, it impacts the drop weight 3, and the drop weight 3 moves upward along the guide rail 2, passes over the movable block 9, hits the damper 7, and then falls. The damper 7 can effectively absorb the energy of the drop weight 3, and prevent the drop weight 3 from being impacted upward too high by the airbag 13, and the energy is too large to damage the experimental equipment. In this example, four dampers 7 are arranged, and other numbers of dampers 7 can be set according to actual needs.

[0032] The blocking assembly includes a blocking column 8, a movable block 9, and an elastic mechanism. The lower end of the movable block 9 is connected to the blocking column 8 by a rotating shaft, the upper end of the movable block 9 protrudes from the surface of the blocking column 8, and an elastic mechanism is provided between the upper end of the movable block 9 and the blocking column 8.

[0033] After the airbag 13 explodes, it impacts the drop hammer 3, which moves upward along the guide rail 2 and contacts the movable stopper 9. The movable stopper 9 is forced to rotate around the rotating axis toward the blocking column 8, and the movable stopper 9 avoids the drop hammer 3, and the drop hammer 3 continues to move upward along the guide rail 2 without being blocked; after the drop hammer 3 separates from the movable stopper 9, the movable stopper 9 rebounds back to the initial position under the action of the elastic mechanism; when the drop hammer 3 falls, the movable stopper 9 abuts against the bottom of the drop hammer 3, and the movement of the drop hammer 3 stops. In this example, four blocking columns 8 and four movable stops 9 are arranged, and other numbers of blocking columns 8 and movable stops 9 can be set according to actual needs.

[0034] A heightening snap ring 10 is inserted on the guide rail 2, and the height of the heightening snap ring 10 matches the initial height of the drop weight 3. The heightening snap ring 10 is used to adjust the initial height of the drop weight 3 before the experiment begins; the heightening snap ring 10 can be designed in a variety of specifications, such as 1mm, 2mm, 5mm, 10mm, etc. According to the initial height requirements of the drop weight 3 designed in the experiment and the stability requirements of the experiment, the corresponding combination of snap ring groups is installed on the guide rail 2.

[0035] The data receiving ends of the acceleration sensor 12 and the force sensor 11 are connected to the data receiving end of the data acquisition and processing device. The data acquisition and processing device is used to collect the force value measured by the force sensor 11 and the acceleration value measured by the acceleration sensor 12, and then process these collected data to obtain the force value curve and the acceleration curve respectively.

[0036] In order to ensure that the support frame 1, the guide rail 2, the drop weight 3, the airbag installation mechanism 4, the blocking column 8, the movable stopper 9, and the padding clamp 10 have good strength and rigidity, the support frame 1 also needs to have good impact resistance. Therefore, in a preferred embodiment, the above components can be made of metal materials such as iron, steel, and aluminum, and the support frame 1 can also be made of alloy. In some cases, other materials that can meet the requirements of strength, rigidity, and impact resistance can also be used to make the above components.

[0037] The present invention comprises the following steps: step 1, connecting the lifting rope of the pulley rocker group with the drop hammer, shaking the rocker of the pulley rocker group, raising the drop hammer to be close to the damper, and fixing the airbag in an unexploded and contracted state to the airbag installation mechanism; step 2, selecting a cushioning clamp ring according to the initial height of the drop hammer designed in the experiment, and inserting the cushioning clamp ring into the guide rail; step 3, shaking the rocker of the pulley rocker group in the opposite direction, and slowly lowering the drop hammer to contact the cushioning clamp ring; step 4, removing the connection between the lifting rope of the pulley rocker group and the drop hammer; step 5, detonating the airbag, and the airbag is deployed and impacted to push the drop hammer, and the drop hammer moves upward along the guide rail. The acceleration sensor measures the acceleration value of the airbag impacting the drop hammer during the detonation process, and the force sensor measures the impact force value of the airbag during the detonation process; the data acquisition and processing device collects the impact force value and the acceleration value, and obtains the required impact force value curve and acceleration curve according to these data processing; step 6, when the drop hammer moves upward along the guide rail, it contacts the movable block, and the movable block avoids the drop hammer, and the drop hammer continues to move upward along the guide rail; step 7, after the drop hammer is separated from the movable block, the movable block rebounds back to the initial position; step 8, the drop hammer hits the damper and then falls, the movable block catches the drop hammer, and the drop hammer movement stops.

[0038] The present invention can be used to verify the accuracy of the simulation model of the test airbag 13, and the impact force value curve of the installation position of the airbag 13 and the acceleration curve of the drop hammer 3 are overlapped with the impact force value curve and the acceleration curve obtained by the CAE simulation model. If the overlap reaches the preset standard, the credibility of the CAE simulation model is high, and it can truly simulate the reverse thrust impact of the airbag 13 on the surrounding environment. If the overlap does not reach the preset standard, the credibility of the CAE simulation model is low, and the CAE simulation model is optimized or rebuilt.

[0039] The present invention designs airbag test equipment and methods, which can effectively measure the reverse thrust impact force on surrounding parts when the airbag is detonated, and can effectively verify the accuracy of the airbag CAE simulation model, thereby providing reliable and practical guidance for the structural design and production of parts, which is conducive to avoiding the risks caused by unreasonable design and manufacturing as much as possible, and effectively improving the safe use performance of parts.

Claims

1. An airbag test equipment, comprising a guide rail, an airbag mounting mechanism, a drop weight, an acceleration sensor, a force sensor, a pulley rocker assembly, a damper, and a blocking assembly, characterized in that: A force sensor (11) is installed below the airbag installation position of the airbag installation mechanism (4), a plurality of guide rails (2) are vertically arranged around the airbag installation mechanism (4), a drop weight (3) is mounted between the plurality of guide rails (2), an edge of the drop weight (3) is slidably connected to the guide rails (2), a blocking assembly is arranged on the outer side of the plurality of guide rails (2), the blocking assembly abuts against the bottom of the drop weight (3) or contacts or separates from the edge of the drop weight (3), a damper (7) is arranged at the extreme position of the drop weight (3) when it rises, an acceleration sensor (12) is installed on the top of the drop weight (3), a pulley rocker group (6) is installed above the drop weight (3), a lifting rope of the pulley rocker group (6) is connected or separated from the drop weight (3), The blocking assembly comprises a blocking column (8), a movable block (9), and an elastic mechanism, wherein the lower end of the movable block (9) is connected to the blocking column (8) by a rotating shaft, the upper end of the movable block (9) protrudes from the surface of the blocking column (8), and an elastic mechanism is provided between the upper end of the movable block (9) and the blocking column (8); When the drop hammer (3) moves upward along the guide rail (2) and contacts the movable stopper (9), the movable stopper (9) avoids the drop hammer (3); when the drop hammer (3) falls, the movable stopper (9) abuts against the bottom of the drop hammer (3).

2. The airbag test equipment according to claim 1, characterized in that: The airbag mounting mechanism (4) comprises a mounting plate and a fixing component, the end of the fixing component is connected to the bottom of the mounting plate, a force sensor (11) is provided between the fixing component and the mounting plate, and a safety airbag (13) to be tested is fixed to the top of the mounting plate.

3. The airbag test equipment according to claim 1, characterized in that: The drop weight (3) and the guide rail (2) are connected by a bearing.

4. The airbag test equipment according to claim 1, characterized in that: The damper (7) comprises a hydraulic device.

5. The airbag test equipment according to claim 1, characterized in that: A heightening clamp ring (10) is inserted into the guide rail (2), and the height of the heightening clamp ring (10) matches the initial height of the drop hammer (3).

6. The airbag test equipment according to claim 1, characterized in that: The data receiving ends of the acceleration sensor (12) and the force sensor (11) are connected to the data receiving end of the data acquisition and processing device.

7. The airbag test equipment according to claim 1, characterized in that: The guide rail (2), airbag mounting mechanism (4), pulley rocker assembly (6), damper (7), and blocking assembly are mounted on a support frame (1), and the impact resistance of the support frame (1) is greater than the impact force when the safety airbag (13) is detonated.

8. An experimental method using the airbag experimental device as claimed in claim 1, characterized in that: The method comprises the following steps: step 1, connecting the lifting rope of the pulley rocker group to the drop hammer, shaking the rocker of the pulley rocker group, raising the drop hammer to be close to the damper, and fixing the airbag in an unexploded and contracted state to the airbag installation mechanism; step 2, selecting a cushioning clamp ring according to the initial height of the drop hammer designed in the experiment, and inserting the cushioning clamp ring into the guide rail; step 3, shaking the rocker of the pulley rocker group in the opposite direction, and slowly lowering the drop hammer to contact the cushioning clamp ring; step 4, removing the connection between the lifting rope of the pulley rocker group and the drop hammer; step 5, detonating the airbag, and the airbag is deployed and impacts the drop hammer, and the drop hammer moves upward along the guide rail to accelerate The speed sensor measures the acceleration value of the impact of the drop hammer during the detonation of the airbag, and the force sensor measures the impact force value of the airbag during the detonation; the data acquisition and processing device collects the impact force value and the acceleration value, and obtains the required impact force value curve and acceleration curve according to these data processing; step 6, when the drop hammer moves upward along the guide rail, it contacts the movable block, and the movable block avoids the drop hammer, and the drop hammer continues to move upward along the guide rail; step 7, after the drop hammer is separated from the movable block, the movable block rebounds back to the initial position; step 8, the drop hammer hits the damper and falls, the movable block catches the drop hammer, and the drop hammer movement ends.

9. The test method of the airbag test equipment according to claim 8, characterized in that: The method also includes step 9, in which the impact force value curve and the acceleration curve are overlapped with the impact force value curve and the acceleration curve obtained by the CAE simulation model. If the overlap reaches a preset standard, the credibility of the CAE simulation model is high; if the overlap does not reach the preset standard, the credibility of the CAE simulation model is low, and the CAE simulation model is optimized or rebuilt.

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