Slide rail type high-acceleration precision detection device and method based on power-on breaking sheet constraint

Abstract

The invention discloses a slide rail type high-acceleration precision detection device and method based on constraint of a power-on snap piece, a slide rail is arranged on a base, side walls are arranged on the left and right sides of the base, two slide blocks are arranged on the slide rail, an acceleration sensor is arranged on one slide block, an air bag is arranged between the two slide blocks, and the snap piece stretches across the two slide blocks. And the two connecting rods are fixedly connected with the two sliding blocks respectively. A first power-up signal line and a second power-up signal line are arranged on a pull-apart piece so as to apply electric signals to the two ends of the pull-apart piece, and the electric signals are monitored through a first detection signal line and a second detection signal line. By adopting the technical scheme of the invention, the accurate time point at which the acceleration is sharply increased in the sliding rail type acceleration testing process can be accurately detected and identified, and the instantaneous acceleration can be obtained through the collected electric signal; and the accurate time that the real response of the acceleration sensor lags behind the pressurizing points in the acceleration testing process can be reflected and analyzed.

Description

Technical Field

[0001] This invention pertains to acceleration detection technology, and more specifically, to the monitoring of sliding rail acceleration testing processes. The innovation of this invention lies in proposing a novel detection device and method capable of accurately capturing the acceleration response time of a sliding rail slider. Background Technology

[0002] In recent years, China's aerospace technology has developed rapidly, leading to increasingly higher requirements for testing equipment and technologies for flight devices. The sudden detachment or movement of aircraft accessories generates significant acceleration, which in turn produces substantial reaction forces on the aircraft. Acceleration, as a crucial parameter measuring the magnitude and direction of force acting on an object, is a vital indicator of flight quality, and its measurement is of great significance for aircraft control. Acceleration testing demands that the testing equipment have fast response, high accuracy, and good repeatability, requiring continuous increases in research and development investment and efforts. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and propose a slide rail type acceleration detection device, as well as a slide rail type high acceleration precision detection device and method based on the constraint of the electrically charged tensile plate. It can realize the acceleration measurement and detection at the moment the slider bursts open, without ignoring the elastic deformation process of the tensile plate before it breaks, and improve the response time accuracy of the slide rail type acceleration detection device when the slider bursts open.

[0004] The technical objective of this invention is achieved through the following technical solution.

[0005] The slide rail type acceleration testing device includes a slide rail, a slider, and an acceleration sensor. The slide rail is set on a base, and side walls are set on the left and right sides of the base. Two sliders are set on the slide rail, and the acceleration sensor is set on one slider. An air bladder is set between the two sliders. The air bladder inlet is connected to an external air filling device. A breakaway plate is set on the slider, which spans the two sliders and is fixedly connected to the two sliders respectively.

[0006] In the technical solution of the present invention, anti-collision PC plates are provided on the side walls on both sides.

[0007] In the technical solution of this invention, the number of slide rails is two.

[0008] In the technical solution of the present invention, the acceleration sensor is selected as a single-axis or three-axis acceleration sensor.

[0009] In the technical solution of the present invention, the break plate and the two sliders are fixed by bolts.

[0010] In the technical solution of this invention, the tensile sheet is an aluminum alloy sheet with a thickness of 1-3 mm.

[0011] A high-acceleration precision detection device based on an electrically charged tensile plate constraint includes a slide rail, sliders, and an acceleration sensor. The slide rail is mounted on a base, with sidewalls on the left and right sides of the base. Two sliders are mounted on the slide rail, and the acceleration sensor is mounted on one slider. An airbag is positioned between the two sliders. The airbag's inlet is connected to an external air supply device. A tensile plate is mounted on each slider, spanning the two sliders and fixedly connected to each slider. A first electrical signal line and a second electrical signal line are mounted on the tensile plate to apply electrical signals to both ends of the plate, and the electrical signals are monitored via the first and second detection signal lines.

[0012] The computer communicates with the data acquisition card in real time. The computer sends acquisition signals to the data acquisition card, which acquires acceleration signals, electrical signals at both ends of the broken piece, and airbag inflation signals. The analog output terminal of the data acquisition card sends an analog output signal to the controller. After receiving the signal from the data acquisition card, the controller simultaneously sends signals to the warning device and the inflation device. Specifically, the warning device issues an alert upon receiving the signal to facilitate observation of whether the airbag inflation signal is provided. The airbag inflation signal is transmitted to the inflation device to inflate the airbag, and simultaneously, the airbag inflation signal is sent to the analog input terminal of the data acquisition card.

[0013] In the technical solution of the present invention, a first insulating structure is provided between the fastening bolt and the break plate, and a second insulating structure is provided between the break plate and the slider.

[0014] In the technical solution of this invention, an insulating gasket is provided between the breakaway plate and the slider, a portion of the thread of the fastening bolt is fitted into the bolt insulating sleeve, and an insulating washer is provided below the nut of the fastening bolt. When the bolt is tightened into the slider, the thread not fitted into the insulating sleeve and the slider are threadedly connected. An insulating washer and a bolt insulating sleeve exist between the nut of the fastening bolt and the breakaway plate, and an insulating gasket exists between the breakaway plate and the slider to ensure insulation.

[0015] In the technical solution of the present invention, the insulating materials for the insulating gasket, insulating washer and bolt insulating sleeve are insulating rubber or polytetrafluoroethylene.

[0016] In the technical solution of this invention, the acceleration signal is acquired by an acceleration sensor and transmitted to the analog input terminal of the acquisition card via a sensor transmitter.

[0017] In the technical solution of the present invention, the two ends of the broken piece are connected to the analog input terminal of the acquisition card through the first detection signal line and the second detection signal line.

[0018] In the technical solution of this invention, the acquisition frequency of the acquisition card is above 200KHz.

[0019] A precision detection method for slide rail acceleration based on the constraint of an electrically charged break plate is used to collect acceleration signals, electrical signals at both ends of the break plate, and airbag inflation signals through a data acquisition card. Initially, the electrical signals at both ends of the break plate remain at zero; when the break plate breaks, the collected electrical signals jump, which is the detected time point of the break plate breaking, corresponding to the time point of the rapid increase in acceleration.

[0020] In the technical solution of this invention, the electrical signal is a voltage signal.

[0021] In the technical solution of this invention, experimental data is used to compare the positional relationship between the voltage change time points at both ends of the broken piece and the airbag impact signal time points and the rapid change time points of the acceleration sensor signal, and the analysis is performed in conjunction with the following formulas: The theoretical calculation formulas for strain, time and acceleration during the brittle fracture process of the material are shown in (1), (2) and (3). σ (Pa), E (Pa), L0 (m), ΔL (m), a (m / s 2 ) and t(s) represent the tensile strength, elastic modulus, gauge length of the specimen, deformation, deformation acceleration of the broken piece, and tensile time before the broken piece, respectively.

[0022] When a high loading rate causes brittle fracture in a material, the material undergoes minimal plastic deformation but elastic deformation, and the fracture strain ε is contributed solely by the elastic stage.

[0023]

[0024] Deformation of the tensile fragment:

[0025] ΔL=ε*L0 (2)

[0026] During the elastic deformation stage of the broken piece, the relationship between the sensor acceleration and the deformation of the broken piece during the tensile process can be expressed as:

[0027]

[0028] The technical solution of this invention can accurately detect and identify the precise time point when the acceleration increases sharply during the slide rail acceleration test. It proposes a precision detection device and method for slide rail acceleration based on the constraint of the electrically charged tensile plate, which realizes high-precision monitoring of the response time during the acceleration test. By collecting the electrical signal, not only can the instantaneous acceleration magnitude be obtained, but also the precise time between the actual response of the acceleration sensor and the pressure point can be reflected and analyzed. Attached Figure Description

[0029] Figure 1This is a schematic diagram of a sliding rail type acceleration detection device, where 1 is the base, 2 is the anti-collision PC board, 3 is the sliding rail, 4 is the slider, 5 is the acceleration sensor, 6 is the airbag, and 7 is the airbag inlet.

[0030] Figure 2 This is a schematic diagram of a slide rail type acceleration detection device based on a tensile plate constraint. In the diagram, 1 is the base, 2 is the anti-collision PC board, 3 is the slide rail, 4 is the slider, 5 is the acceleration sensor, 6 is the airbag, 7 is the airbag inlet, 8 is the fastening bolt, and 9 is the tensile plate.

[0031] Figure 3 This is a schematic diagram of the test results where the response time to the rapid change in the acceleration signal lags behind the detonation time.

[0032] Figure 4 This is a schematic diagram of the tensile sheet structure used in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of a slide rail-type precision acceleration detection device based on an electrically charged tensile plate constraint. In the diagram, 1 is the base, 2 is the anti-collision PC board, 3 is the slide rail, 4 is the slider, 5 is the acceleration sensor, 6 is the airbag, 7 is the airbag inlet, 8 is the fastening bolt, 9 is the tensile plate, 10 is the first detection signal line, 11 is the second detection signal line, 12 is the second electrical signal line, and 13 is the first electrical signal line.

[0034] Figure 6 This is a schematic diagram of the insulation treatment between the pull-off plate, bolt and slider in a slide rail type acceleration precision detection device based on the constraint of the energized pull-off plate. In the diagram, 4 is the slider, 8 is the fastening bolt, 9 is the pull-off plate, 14 is the bolt insulating sleeve, 15 is the insulating gasket and 16 is the insulating washer.

[0035] Figure 7 This is a schematic diagram of the signal processing structure of a slide rail-type precision acceleration detection device based on the constraint of an electrically charged tensile plate.

[0036] Figure 8 This is a schematic diagram of the signal acquisition structure for a sliding rail-type precision measurement acceleration response time test based on the constraint of an electrically charged tensile plate.

[0037] Figure 9 This is a schematic diagram of the acceleration signal response process captured during the test of the sliding rail precision measurement acceleration response time based on the constraint of the electrically charged tensile plate. Detailed Implementation

[0038] The technical solution of the present invention will be further illustrated below with specific examples.

[0039] like Figure 1As shown, the slide rail type acceleration testing device includes a slide rail, a slider, and an acceleration sensor, wherein: the slide rail is set on the base, and side walls are set on the left and right sides of the base; preferably, there are two slide rails, and anti-collision PC plates are set on the side walls on both sides; two sliders are set on the slide rails, the acceleration sensor is set on one slider, and an airbag is set between the two sliders.

[0040] In the initial stage (i.e., before the experiment begins), the airbag is inflated, and its air inlet is connected to an external inflation device (including inflation control equipment). During the experiment, the airbag is rapidly inflated by instantaneous pressurization or a method similar to an explosion, causing the slider to move violently and generate significant acceleration. Therefore, a high-strength material is chosen for the airbag's outer shell. A single-axis or three-axis accelerometer is selected, and its data cable is connected to a signal acquisition card to measure the magnitude of the slider's acceleration, thereby estimating the magnitude of the expansion force and the equivalent of the expansion energy.

[0041] To increase the instantaneous acceleration of the slider due to instantaneous pressure expansion, a tension plate is added above the slider, such as... Figure 2 As shown, a breakable plate spans two sliders and is fixedly connected to each slider. Bolts are used to secure the breakable plate and the two sliders, constraining them. The breakable plate can only break when the airbag inflation force is sufficiently large. The sliders, constrained by the breakable plate, clamp the airbag, generating intense inflation pressure. When the breakable plate suddenly breaks, the sliders slide violently, generating sufficiently large acceleration, with peak values ​​reaching several thousand g (acceleration due to gravity). Typically, the breakable plate is made of 1-3 mm thick aluminum alloy sheet.

[0042] This invention uses 6061 (T6 temper) standard stretched aluminum alloy samples for sheet fabrication, such as... Figure 4 As shown, its dimensions are T = 1.2 mm, L = 60 mm, L0 = 30 mm, L1 = 8 mm, b0 = 20 mm, b = 40 mm, r = 10 mm, tensile strength σ is 300 MPa, and elastic modulus E is 70 GPa. Airbag inflation rate and inflation magnitude: The airbag inflation method is similar to the rapid inflation process of a car airbag, and the equivalent TNT equivalent during the inflation process is 16.9-50.7 g. During the experiment, it was found that during the acceleration signal acquisition process, the time point at which the acceleration sensor signal on the slider began to change significantly always lagged slightly behind the airbag inflation or detonation time point, such as... Figure 3As shown. At 40μs, the airbag inflation signal is given, the airbag inflates rapidly, the slider begins to slide to both sides, and the tension plate begins elastic deformation. At this time, the acceleration is very small. Around 200μs, the acceleration signal begins to change significantly. At this time, the tension plate suddenly breaks, and the slider slides violently. That is, within the 40-200μs period, the acceleration signal does not change significantly because the tension plate has not yet broken and has undergone elastic deformation. At 200μs, the tension plate breaks, and the acceleration signal changes drastically. The accelerometer has a high response speed and accuracy for acceleration testing itself. However, due to the addition of the tension plate during the test, at the moment of pressurization or detonation, the tension plate is subjected to a rapid tensile force. Although it undergoes brittle fracture, it still has a certain elastic deformation stage, which consumes a certain amount of time. Therefore, compared with the instant of pressurization, the time point of significant change in acceleration signal is delayed by a certain amount of time. Figure 3 The hysteresis is approximately 160 μs. During this period, the breakage plate is in the elastic deformation stage before breakage (acceleration increases slowly), and it cannot be guaranteed that the breakage point is the moment the airbag begins to inflate. Therefore, it is necessary to further determine the breakage point of the breakage plate, which will allow us to determine the starting point of a significant change in the acceleration signal on the slider. The acceleration sensor response is a continuously changing process, evolving from a small value to a peak value. Therefore, it is impossible to accurately determine the timing of the acceleration sensor response when the breakage plate breaks and when the slider begins to burst and move rapidly, thus causing experimental errors in the timing accuracy of the acceleration test. If this experimental error is not considered, the airbag pressurization or detonation time would be assumed to be the acceleration signal change time. However, for high-precision measuring devices, this measurement is unreliable.

[0043] exist Figure 2 The aforementioned slide rail acceleration testing device is supplemented with an electrical signal-based application and detection device, and insulating components are installed at relevant locations on the device to realize a slide rail-type acceleration precision detection device based on the constraint of an electrically charged tensile plate. For example... Figure 5 As shown, a first power-on signal line and a second power-on signal line are provided on the breakable piece to apply an electrical signal (such as voltage) to both ends of the aluminum breakable piece 9, and the electrical signal is monitored through the first and second detection signal lines. To isolate the breakable piece from the electrical signal connection of the acceleration testing device, a first insulation structure is provided between the fastening bolt and the breakable piece, and a second insulation structure is provided between the breakable piece and the slider. Figure 6As shown, an insulating gasket 15 is placed between the breakaway plate and the slider. Part of the thread of the fastening bolt is fitted into the bolt insulating sleeve. An insulating washer is placed under the nut of the fastening bolt. When the bolt is tightened into the slider, the thread not fitted into the insulating sleeve is threadedly connected to the slider. There is an insulating washer and a bolt insulating sleeve between the nut of the fastening bolt and the breakaway plate, and an insulating gasket between the breakaway plate and the slider to ensure insulation. The insulating material used above can be selected according to the actual test conditions, such as insulating rubber or polytetrafluoroethylene.

[0044] During the experiment, a fast-inflation high-voltage airbag is clamped between two sliders. An insulating gasket is placed between the breakaway piece and the sliders. The threaded hole of the slider, the hole of the insulating gasket, and the hole of the breakaway piece are concentric. The holes of the insulating gasket and the breakaway piece are slightly larger than the threaded hole of the slider. An insulating sleeve passes through the hole of the breakaway piece and the hole of the insulating gasket, contacting the surface of the slider. A bolt washer is placed, and the bolt is passed through the insulating sleeve and tightened into the slider to fix the breakaway piece.

[0045] Connect the two ends of the broken piece 9 to the analog input terminal AI of the acquisition card via the first detection signal line 10 and the second detection signal line 11, such as... Figure 7 The diagram shows the signal processing structure of a slide rail-type precision acceleration detection device based on an electrically charged tensile plate constraint. The device detects the response time of the slider acceleration by utilizing the voltage change across the tensile plate. During operation, the computer and the data acquisition card communicate in real-time. The computer sends acquisition signals to the acquisition card, which acquires three data points: acceleration signal (acquired by an acceleration sensor and transmitted to the analog input terminal AI of the acquisition card via a sensor transmitter), electrical (voltage) signals across the tensile plate (i.e., the voltage between the first detection signal line 10 and the second detection signal line 11), and airbag inflation signal (i.e., the analog input terminal AI of the acquisition card). Simultaneously with data acquisition, the acquisition card (i.e., the analog output terminal AO of the acquisition card) sends an analog output signal to the controller. Upon receiving the signal from the acquisition card, the controller simultaneously sends signals to the warning device and the inflation control device. Specifically, the warning device issues an alert upon receiving the signal to facilitate observation of whether the airbag inflation signal has been provided; the airbag inflation signal is transmitted to the inflation control device to inflate the airbag, and simultaneously sent to the analog input terminal of the acquisition card.

[0046] Because the aluminum breakaway plate undergoes minimal plastic deformation during rapid stretching in airbag inflation, it fractures brittlely with an elastic component upon breaking. This process is short, necessitating a high acquisition frequency, ideally above 200kHz. The acquisition card measures the potential difference across the breakaway plate. Initially, the voltage across the plate is almost zero; when the plate breaks, the acquired voltage jumps, marking the point at which the plate breaks, and this is also the point of rapid acceleration increase. Figure 3 As shown, the time when the tensile fragment between the two sliders bursts open is after the time point when the airbag inflation signal is issued, and the time point when the acceleration signal begins to respond is synchronized with the time point when the airbag inflation signal is issued. The actual time point of fracture of the tensile fragment is the time point when the two sliders burst open, which is the time point when the acceleration rapidly increases.

[0047] like Figure 5 As shown, a 1V open-circuit voltage signal is connected to both ends of the break-off plate (i.e., pressurization is achieved through the second and first power-on signal lines). The high-pressure airbag inflation pressure is set to 3MPa. The airbag inflation signal, the acceleration sensor, and the detection signal lines for the voltage across the break-off plate are connected to the analog input port of the data acquisition card. The warning device is set as a small LED; the LED illuminates simultaneously with the controller sending the inflation signal, ensuring the controller is performing the airbag inflation program. After completing the above steps, the computer acquisition interface is opened. The sampling channels are set to three channels, the sampling mode to single-ended mode, and the sampling rate to 1M / s. The data storage path is also set. When the computer clicks "Start Acquisition" on the acquisition interface, the acquisition card acquires signals and the analog output voltage signal synchronously. After the parameters are set on the acquisition interface, data is collected without input. After the controller receives the 5V trigger signal from the acquisition card, it sends two-channel synchronous signals to the warning device LED and the airbag inflation signal after a two-second interval. Observe the airbag compression signal, the voltage at both ends of the fracture plate, and the acceleration signal on the computer acquisition interface to ensure they are correct and that the computer can store the data. After confirming that everything is correct, begin the formal test. To start the test, click "Start" on the computer acquisition interface. Two seconds later, the airbag inflates rapidly, the warning light illuminates, and the airbag inflates rapidly. The pressure on the fracture plate increases sharply until brittle fracture occurs. The voltage at both ends of the fracture plate rises sharply from a small value to the original applied pressure of 1V. At this point, the slider is no longer constrained by the fracture plate and moves rapidly under the expansion force. The acceleration sensor collects the drastically changing slider acceleration signal. This point in time when the fracture plate breaks can be considered the point of rapid acceleration increase, allowing for accurate judgment of the acceleration change timing.

[0048] A schematic diagram of the signal acquisition process during the entire experiment is shown below. Figure 8 As shown, Figure 9The details of the captured acceleration signal response process are shown below. At 34 μs, the airbag inflation signal is given, the airbag inflates rapidly, and the fracture plate begins elastic deformation. At this time, the acceleration signal change is not obvious. At 215 μs, the acceleration signal begins to rise slightly, and the fracture plate begins to break. At 223 μs, the voltage across the fracture plate exceeds 1V, at which point the fracture plate completely breaks, and the acceleration signal rises significantly. The fracture time of the fracture plate is approximately 189 μs from the airbag inflation time. The point of rapid change in the acceleration sensor signal is synchronized with the fracture time of the fracture plate. The airbag inflation rate determines the fracture time of the fracture plate. The experimental setup and analysis method illustrated above can achieve precise monitoring of the response time of the sliding rail acceleration detector.

[0049] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A sliding rail type acceleration testing device, characterized in that, It includes a slide rail, a slider, and an acceleration sensor. The slide rail is mounted on a base, and side walls are provided on the left and right sides of the base. Two sliders are mounted on the slide rail, and the acceleration sensor is mounted on one slider. An airbag is provided between the two sliders. The airbag inlet is connected to an external air filling device. A breakaway plate is provided on the slider, which spans the two sliders and is fixedly connected to the two sliders respectively.

2. The slide rail type acceleration testing device according to claim 1, characterized in that, Anti-collision PC plates are installed on both side walls, and there are two slide rails. The acceleration sensor can be a single-axis or three-axis acceleration sensor.

3. The slide rail type acceleration testing device according to claim 1, characterized in that, The break plate and two sliders are fixed by bolts. The break plate is an aluminum alloy sheet with a thickness of 1-3mm.

4. A slide rail type high acceleration precision detection device based on electric tension plate constraint, characterized in that, The device includes a slide rail, sliders, and an acceleration sensor. The slide rail is mounted on a base, with sidewalls on the left and right sides of the base. Two sliders are mounted on the slide rail, and the acceleration sensor is mounted on one slider. An airbag is positioned between the two sliders. The airbag's inlet is connected to an external air supply device. A breakaway plate is mounted on each slider, spanning the two sliders and fixedly connected to each slider. A first and second electrical signal lines are mounted on the breakaway plate to apply electrical signals to both ends of the plate, and the electrical signals are monitored via the first and second detection signal lines. The computer communicates with the data acquisition card in real time. The computer sends acquisition signals to the data acquisition card, which acquires acceleration signals, electrical signals at both ends of the broken piece, and airbag inflation signals. The analog output terminal of the data acquisition card sends an analog output signal to the controller. After receiving the signal from the data acquisition card, the controller simultaneously sends signals to the warning device and the inflation device. Specifically, the warning device issues an alert upon receiving the signal to facilitate observation of whether the airbag inflation signal is provided. The airbag inflation signal is transmitted to the inflation device to inflate the airbag, and simultaneously, the airbag inflation signal is sent to the analog input terminal of the data acquisition card.

5. The slide rail type high acceleration precision detection device based on electric tension plate constraint according to claim 4, characterized in that, The break plate and two sliders are fixed by bolts. The break plate is an aluminum alloy sheet with a thickness of 1-3mm.

6. A slide rail type high acceleration precision detection device based on an electrically charged tensile sheet constraint according to claim 4 or 5, characterized in that, Anti-collision PC plates are installed on both side walls, and there are two slide rails. The acceleration sensor can be a single-axis or three-axis acceleration sensor.

7. A slide rail type high acceleration precision detection device based on an electrically charged tensile sheet constraint according to claim 4 or 5, characterized in that, The acquisition card has an acquisition frequency above 200KHz. The acceleration signal is acquired by the acceleration sensor and transmitted to the analog input terminal of the acquisition card via the sensor transmitter. The two ends of the broken piece are connected to the analog input terminal of the acquisition card through the first detection signal line and the second detection signal line.

8. A slide rail type high acceleration precision detection device based on an electrically charged tensile sheet constraint according to claim 4 or 5, characterized in that, A first insulating structure is provided between the fastening bolt and the break-off plate, and a second insulating structure is provided between the break-off plate and the slider; an insulating gasket is provided between the break-off plate and the slider, a portion of the thread of the fastening bolt is fitted into the bolt insulating sleeve, and an insulating washer is provided below the nut of the fastening bolt; the insulating materials of the insulating gasket, insulating washer and bolt insulating sleeve are selected as insulating rubber or polytetrafluoroethylene.

9. A method for precise acceleration detection using a slide rail-type high acceleration precision detection device based on an electrically charged tensile sheet constraint as described in any one of claims 4-8, characterized in that, Acceleration signals, electrical signals at both ends of the broken piece, and airbag inflation signals are collected by a data acquisition card. Initially, the electrical signals at both ends of the broken piece remain at zero. When the broken piece breaks, the collected electrical signals jump, which is the detected time point of the broken piece breaking, corresponding to the time point of the rapid increase in acceleration.

10. The method for precise acceleration detection according to claim 9, characterized in that, The electrical signal is a voltage signal; using experimental data, the positional relationship between the voltage change time points at both ends of the fractured piece and the airbag impact signal time points and the rapid change time points of the acceleration sensor signal is compared, and the following formulas are used for analysis: The theoretical calculation formulas for strain, time, and acceleration during the brittle fracture process of the material are shown in (1), (2), and (3), σ 抗拉 E, L0, ΔL, a, and t represent the tensile strength of the material, in Pa. Elastic modulus, measured in Pa; Gauge length of the specimen, in meters; Deformation amount, in meters (m); The deformation acceleration of the tensile fragment, in m / s² 2 The tensile time before the tensile section breaks, in seconds; When a high loading rate causes brittle fracture in a material, the material undergoes minimal plastic deformation but elastic deformation, and the fracture strain ε is contributed solely by the elastic stage. Deformation of the tensile fragment: △L=ε*L0 (2) During the elastic deformation stage of the broken piece, the relationship between the sensor acceleration and the deformation of the broken piece during the tensile process can be expressed as:

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