Performance testing device and testing method for pyrotechnic hood lifter

Abstract

The application discloses a performance testing device of a pyrotechnic engine hood jacking device, which comprises a supporting base, a fixing bottom plate, a fixing support, a displacement sensor A, a sliding rail, a force sensor A, a weight block, a connecting rod, a baffle and a pressing block. The performance data of the pyrotechnic engine hood jacking device can be tested by the performance testing device. The application further discloses a performance testing method of an engine hood jacking device. The performance testing device is used for testing, and the testing comprises the following steps: fixing the jacking device, adjusting the gap between the jacking device and the weight block, igniting the jacking device at the gap point, collecting the moving displacement and acceleration data of the weight block in the jacking process, collecting the impact force data of the jacking device, collecting the force value data in the retraction process of the jacking device, generating a curve from the collected data, and comparing the curve with a CAE simulation model after interference elimination. The performance analysis result of the jacking device is obtained according to the CAE simulation model. The application has the advantages of simple operation, high accuracy and favorable optimization of the product performance of the jacking device.

Description

Technical Field

[0001] This invention belongs to the field of testing equipment technology, and relates to a performance testing device for a pyrotechnic hood lifting device, as well as a performance testing method for a hood lifting device. Background Technology

[0002] As living standards improve, the rate of car ownership among the population is also increasing. At the same time, pedestrian protection technology is also constantly developing. Currently, one of the mainstream pedestrian protection methods is to use a firework-style hood lifting device to lift the hood to a certain height during a collision to achieve the effect of pedestrian protection. However, there is a lack of performance testing methods, and it often needs to be judged through real vehicle verification, which has a long design cycle and high experimental costs.

[0003] Since the risks of developing the hood and lifting device system are closely related to the magnitude of the ignition force of the lifting device, it is necessary to design a hood lifting device ignition force testing device and its testing method that can accurately measure the impact force on surrounding parts such as hinged hoods during the ignition process of the lifting device, and simultaneously measure other physical quantities such as displacement, velocity and acceleration of the hood. Summary of the Invention

[0004] The purpose of this invention is to provide a performance testing device for a pyrotechnic hood lifting device, which can test the performance data of the pyrotechnic hood lifting device.

[0005] Another object of the present invention is to provide a performance testing method for an engine hood lifting device.

[0006] The first technical solution adopted in this invention is a performance testing device for a pyrotechnic hood lifting device, comprising a support base, a fixed base plate fixed on the support base, a fixed bracket, a displacement sensor A and a slide rail provided on the fixed base plate, a force sensor A provided between the fixed bracket and the fixed base plate, the force sensor A being located at the bottom of the fixed bracket, the slide rail being perpendicular to the fixed base plate, a weight block provided on the slide rail, the weight block moving along the slide rail, two connecting rods connected together between the weight block and the fixed base plate, the two connecting rods being perpendicularly fixed to the weight block and the fixed base plate respectively, a baffle perpendicular to the top of the slide rail, and a pressing block provided in the center of the baffle.

[0007] The invention is further characterized in that,

[0008] A force sensor B is installed at the bottom of the pressure block.

[0009] Displacement sensor B is installed on the weight block.

[0010] The slide rail is equipped with a positioning ring, which is a clamp structure and is located below the weight block.

[0011] The slide rail has one or more rails.

[0012] The two connecting rods are connected by rivets.

[0013] The second technical solution adopted in this invention is a performance testing method for an engine hood lifting device, which uses the performance testing device for the pyrotechnic engine hood lifting device of this invention for testing, and is implemented according to the following steps:

[0014] Step 1: Install the unexploded test lifting device onto the fixed bracket;

[0015] Step 2: Adjust the gap between the lifting device and the weight block, and fix the two connecting rods together with rivets. The gap between the lifting device and the weight block is the gap between the lifting device and the hood in actual use.

[0016] Step 3: Detonate the lifting device. Displacement sensor A and displacement sensor B collect the displacement and acceleration data of the weight block during the lifting process, and force sensor A collects the impact force data of the lifting device during the lifting process.

[0017] Step 4: Press down the pressing block, and force sensor B collects the force data during the retraction process of the lifting device;

[0018] Step 5: Transmit the data collected by force sensor A, force sensor B, displacement sensor A, and displacement sensor B into the data acquisition and processing device to generate curves showing the changes in the impact force value of the lifting device, the displacement value of the hood, the speed value of the hood, and the acceleration value of the hood over time.

[0019] Step 6: Use CFC filtering to remove interference signals from the generated curves of the impact force value of the jacking device, the displacement value of the hood, the velocity value of the hood, and the acceleration value of the hood over time, so as to obtain interference-free curves of the impact force value of the jacking device, the displacement value of the hood, the velocity value of the hood, and the acceleration value of the hood over time.

[0020] Step 7: Overlay the curves of the impact force value of the lifting device, the displacement value of the hood, the velocity value of the hood, and the acceleration value of the hood with the curves obtained from the CAE simulation model of the lifting device. If the overlap reaches the preset standard, the credibility of the CAE simulation model is high, and the performance analysis result of the lifting device is obtained based on the CAE simulation model. If the overlap does not reach the preset standard, the credibility of the CAE simulation model is low. Adjust the CAE simulation model parameters or rebuild the CAE simulation model and repeat Step 7 until the CAE simulation model reaches the preset standard. The performance analysis result of the lifting device is obtained based on the CAE simulation model.

[0021] The invention is further characterized in that,

[0022] The CFC filtering method uses filtering levels including CFC-60, CFC-180, CFC-600, and CFC-1000.

[0023] The beneficial effects of this invention are:

[0024] This invention provides a performance testing device for a pyrotechnic hood lifting device. It has a simple structure, is easy to use, can be used for various types of lifting devices, has high reusability, and good stability. By testing the performance parameters of the lifting device, it provides guidance for the structural design and manufacturing of components, which helps to avoid risks caused by unreasonable design and manufacturing, and effectively improves the safe use performance of components.

[0025] This invention provides a performance testing method for an engine hood lifting device. The method is simple and convenient to operate. After collecting the test data of the lifting device, the CAE simulation model is used to analyze the performance of the lifting device, which is highly accurate and conducive to optimizing the performance of the lifting device product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the performance testing device for a firework-type engine hood lifting device according to the present invention.

[0027] Figure 2 This is a diagram showing the state of the performance testing device for the pyrotechnic hood lifting device of the present invention when the lifting device is lifted.

[0028] Figure 3 This is a graph showing the change of the impact force value of the hood lifting device over time, obtained from the performance testing method of the hood lifting device of the present invention.

[0029] In the diagram, 1. Support base, 2. Fixed base plate, 3. Fixed bracket, 4. Rivet, 5. Lifting device, 6. Positioning ring, 7. Weight block, 8. Baffle, 9. Pressing block, 10. Slide rail, 11. Displacement sensor A, 12. Force sensor A, 13. Displacement sensor B. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] This invention provides a performance testing device for a pyrotechnic hood lifting device, such as... Figure 1-2As shown, the device includes a support base 1 fixed to the ground or a general-purpose tooling. A fixed base plate 2 is fixed on the support base 1. A fixed bracket 3, a displacement sensor A11, and a slide rail 10 are mounted on the fixed base plate 2. The lifting device 5 to be tested is fixed on the fixed bracket 3. A force sensor A12 is installed between the fixed bracket 3 and the fixed base plate 2. The force sensor A12 is located at the bottom of the fixed bracket 3. One or more slide rails 10 are provided, and the slide rails 10 are perpendicular to the fixed base plate 2. A weight is mounted on the slide rail 10. Block 7, the weight block 7 moves along the slide rail 10, the weight block 7 is equipped with a displacement sensor B13, the slide rail 10 is equipped with a positioning ring 6, the positioning ring 6 is a clamp structure, and the positioning ring 6 is located below the weight block 7. There are two connecting rods connected together by rivets 4 between the weight block 7 and the fixed base plate 2. The two connecting rods are respectively perpendicularly fixed to the weight block 7 and the fixed base plate 2. The top of the slide rail 10 is equipped with a baffle 8 perpendicular to it. The center of the baffle 8 is equipped with a pressing block 9, and the bottom of the pressing block 9 is equipped with a force sensor B.

[0032] The main functions of each component in the performance testing device of the present invention are as follows:

[0033] Weight block 7 is used to simulate the hood. Multiple sets of weight blocks 7 can be used to adjust the weight according to the actual weight of the hood. The movement trajectory of weight block 7 can represent the movement trajectory of the hood.

[0034] The positioning ring 6 is used to position the weight block 7 on the slide rail 10. By tightening the bolts of the positioning ring 6 clamp structure, the position of the positioning ring 6 on the slide rail 10 is fixed, and the weight block 7 cannot slide down, thus achieving the positioning of the weight block.

[0035] Rivet 4 is used to simulate the breaking of the rivet on the hinge when the hood is lifted. The material and size of rivet 4 are the same as the rivets on the hinge in actual use.

[0036] The slide rail 10 is used to enable the free movement of the weight block 7.

[0037] Displacement sensor A11 and displacement sensor B13 are both used to test the displacement and acceleration of weight block 7. Displacement sensor A11 and displacement sensor B13 can also be replaced by acceleration or velocity sensors.

[0038] The lifting device 5 to be tested is fixed on the fixed bracket 3. A gap of 0 to 20 mm is maintained between the lifting device 5 and the weight block. This gap is the gap between the product and the hood in actual use. The gap is maintained by fixing the position of the weight block 7 by the positioning ring 6 on the slide rail.

[0039] The baffle 8 is used to prevent the weight block 7 from flying out during the lifting process.

[0040] Force sensor A12 is used to collect force data of the jacking device 5 under test during the jacking process, such as... Figure 2 As shown, the force sensor A12 can also be set on the weight block 7 at a position directly opposite the piston of the lifting device 5.

[0041] Force sensor B is used to test the force during the downward pressing process after the lifting device 5 has finished lifting.

[0042] Force sensor A12, force sensor B, displacement sensor A11, and displacement sensor B are all connected to the data acquisition and processing device. The data acquisition and processing device summarizes and processes the acquired data to facilitate subsequent analysis of the product performance of the lifting device.

[0043] This invention discloses a performance testing method for an engine hood lifting device. The method utilizes the performance testing device for the firework-type engine hood lifting device of this invention, and is implemented according to the following steps:

[0044] Step 1: Install the unexploded test lifting device 5 onto the fixed bracket 3;

[0045] Step 2: Adjust the gap between the lifting device 5 and the weight block 7, and fix the two connecting rods together with the rivets 4. The gap between the lifting device 5 and the weight block 7 is the gap between the lifting device and the hood in actual use.

[0046] Step 3: Detonate the lifting device 5. Displacement sensor A11 and displacement sensor B13 collect the displacement and acceleration data of the weight block 7 during the lifting process of the lifting device 5. Force sensor A12 collects the impact force data of the lifting device 7 during the lifting process.

[0047] During the lifting process of the lifting device 5, a high-speed camera can be set up to capture the lifting process. The displacement and acceleration of the weight block 7 can be confirmed in the high-speed photography analysis software to further confirm the working process of the lifting device 5.

[0048] Step 4: Press down the pressing block 9, and the force sensor B collects the force data during the retraction process of the lifting device 5;

[0049] Step 5: Transmit the data collected by force sensor A12, force sensor B, displacement sensor A11, and displacement sensor B13 into the data acquisition and processing device to generate the impact force value of the lifting device (e.g., Figure 3 (As shown), curves showing the changes in hood displacement, hood velocity, and hood acceleration values ​​over time;

[0050] Step 6: Apply CFC (Channel Frequency Class) filtering to remove interference signals from the curves of the generated jacking device impact force value, hood displacement value, hood speed value, and hood acceleration value changing over time. The CFC filtering method can use filtering levels including CFC-60, CFC-180, CFC-600, and CFC-1000 to obtain interference-free curves of the jacking device impact force value, hood displacement value, hood speed value, and hood acceleration value changing over time.

[0051] Step 7: Overlay the curves of the impact force, hood displacement, hood velocity, and hood acceleration values ​​of the uninterrupted lifting device 5 with the curves obtained from the CAE simulation model of the lifting device. If the overlap reaches the preset standard, the CAE simulation model has high reliability, and the performance analysis results of the lifting device are obtained based on the CAE simulation model. If the overlap does not reach the preset standard, the reliability of the CAE simulation model is low. Adjust the CAE simulation model parameters or rebuild the CAE simulation model and repeat Step 7 until the CAE simulation model reaches the preset standard, and the performance analysis results of the lifting device are obtained based on the CAE simulation model.

Claims

1. A performance testing device for a pyrotechnic hood lifting device, characterized in that, The system includes a support base (1), on which a fixed base plate (2) is fixed. A fixed bracket (3), a displacement sensor A (11), and a slide rail (10) are mounted on the fixed base plate (2). A force sensor A (12) is positioned between the fixed bracket (3) and the fixed base plate (2). The force sensor A (12) is located at the bottom of the fixed bracket (3). The slide rail (10) is perpendicular to the fixed base plate (2). A weight block (7) is mounted on the slide rail (10), and the weight block (7) moves along the slide rail (10). A [missing information] is positioned between the weight block (7) and the fixed base plate (2). Two connecting rods are connected together, and the two connecting rods are respectively fixed perpendicularly to the weight block (7) and the fixed base plate (2). The top of the slide rail (10) is provided with a baffle (8) perpendicular to it, and a pressing block (9) is provided in the center of the baffle (8). A force sensor B is provided at the bottom of the pressing block (9). A displacement sensor B (13) is provided on the weight block (7). A positioning ring (6) is provided on the slide rail (10). The positioning ring (6) is a clamp structure and is located below the weight block (7). The slide rail (10) is provided with more than one rod. The two connecting rods are connected by rivets (4).

2. A performance testing method for a hood lifting device, wherein the performance testing device for the pyrotechnic hood lifting device as described in claim 1 is used for testing, characterized in that... The specific steps are as follows: Step 1: Install the unexploded test lifting device (5) onto the fixed bracket (3); Step 2, adjust the gap between the lifting device (5) and the weight block (7), and fix the two connecting rods by rivets (4). The gap between the lifting device (5) and the weight block (7) is the gap between the lifting device and the hood in actual use. Step 3: Detonate the lifting device (5). Displacement sensor A (11) and displacement sensor B (13) collect the displacement and acceleration data of the weight block (7) during the lifting process of the lifting device (5). Force sensor A (12) collects the impact force data of the lifting device (5) during the lifting process. Step 4, press down the pressing block (9), and force sensor B collects the force value data of the lifting device (5) during the retraction process; Step 5: Input the data collected by force sensor A (12), force sensor B, displacement sensor A (11), and displacement sensor B (13) into the data acquisition and processing device to generate curves showing the changes in the impact force value of the lifting device, the displacement value of the hood, the speed value of the hood, and the acceleration value of the hood over time. Step 6: Apply CFC filtering to the generated curves of the jacking device impact force, hood displacement, hood velocity, and hood acceleration values ​​over time to remove interference signals, resulting in interference-free curves of the jacking device impact force, hood displacement, hood velocity, and hood acceleration values ​​over time. The CFC filtering method uses filtering levels including CFC-60, CFC-180, CFC-600, and CFC-1000. Step 7: Overlay the curves of the impact force value of the lifting device, the displacement value of the hood, the velocity value of the hood, and the acceleration value of the hood with the curves obtained from the CAE simulation model of the lifting device. If the overlap reaches the preset standard, the credibility of the CAE simulation model is high, and the performance analysis result of the lifting device is obtained based on the CAE simulation model. If the overlap does not reach the preset standard, the credibility of the CAE simulation model is low. Adjust the CAE simulation model parameters or rebuild the CAE simulation model and repeat Step 7 until the CAE simulation model reaches the preset standard. The performance analysis result of the lifting device is obtained based on the CAE simulation model.

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