A test platform and experimental method suitable for evaluating the impact reduction of capture and buffer devices.

Abstract

This invention relates to a test platform and test method suitable for evaluating the impact reduction of a capture buffer device. The test platform includes an upper test plate, a lower test plate, and a transition fixing fixture for simulating the mounting structure and boundaries of an arrow. The transition fixing fixture is used to fix the platform on a horizontal surface. The upper test plate includes a vertical plate and a horizontal plate, with the vertical plate connected and fixed to the transition fixing fixture. The lower test plate is fixed to the bottom of the horizontal plate of the upper test plate. A through hole of the same size and coaxiality is formed at the center of both the upper and lower test plates for an explosive bolt to pass through and be fixed. After the explosive bolt explodes, the separation screw body and the separation bolt body separate, and the separation screw body is captured by the capture buffer device. A first separation impact sensor is used to collect the impact response generated on the mounting surface of the explosive bolt separation screw body. A second separation impact sensor is used to collect the impact response generated on the instrument mounting surface after the explosive bolt has been in operation.

Description

Technical Field

[0001] This invention belongs to the technical field of shock reduction evaluation test methods for capture and buffer devices, and relates to a test platform and test method suitable for shock reduction evaluation of capture and buffer devices. Background Technology

[0002] Explosive bolts, as one of the earliest separation devices, have the outstanding advantages of high reliability and low cost, and are widely used in interstage separation and satellite-rocket separation of rocket structures. During operation, explosive bolts generate high-speed separation bolts along the device's axis. When these bolts impact the rocket structure, they produce an impact response with high frequency, high acceleration amplitude, and high strain rate, which may damage or cause failure of equipment installed in nearby structures. Therefore, a capture and buffer device is required to capture and buffer the high-speed separation bolts to reduce the impact response caused by the high-speed separation bolts impacting the rocket structure.

[0003] Currently, the impact reduction performance of capture and buffer devices is generally evaluated by measuring the impact response generated by the product through actual ground separation tests. However, since the impact level is closely related to the installation boundary, it is difficult to evaluate the impact level generated by different capture and buffer devices and the same capture and buffer device at different installation boundaries. At the same time, due to the limited installation space of the rocket body structure, the placement of the separation impact sensor varies from model to model. New models cannot directly refer to the impact response test results of previous models and need to conduct repeated tests.

[0004] In addition, the current evaluation of the shock reduction performance of capture and buffer devices is based on the magnitude of the shock response before and after the use of the capture and buffer device. The evaluation index is relatively simple, and the shock response is greatly affected by the external environment. The shock response values ​​obtained from the test have a large dispersion, making it difficult to accurately evaluate the shock reduction performance of the capture and buffer device.

[0005] The high-speed separation bolt body generated during the operation of the explosive bolt impacts the rocket body structure, which is a significant source of the separation impact. Adding a capture and buffer device to capture the separation bolt body and reduce its rebound velocity is an important means of reducing the impact response. Therefore, the difference between the rebound velocity and the incident velocity of the separation bolt body is another key indicator for evaluating the impact reduction performance of the capture and buffer device. Summary of the Invention

[0006] The technical problem solved by this invention is to overcome the shortcomings of the prior art and disclose a test platform and test method suitable for evaluating the shock reduction performance of a capture and buffer device, so as to reasonably and accurately evaluate the shock reduction performance of the capture and buffer device.

[0007] The solution to the technical problem of the present invention is: a test platform suitable for evaluating the impact reduction of a capture buffer device, the test platform including an upper test plate, a lower test plate, a first separation impact sensor, a second separation impact sensor, and a transfer fixing fixture;

[0008] The adapter fixture is used to fix the device to a horizontal surface;

[0009] The upper test plate is L-shaped, consisting of a vertical plate and a horizontal plate, with the vertical plate connected and fixed to the adapter fixture;

[0010] The lower test plate is fixedly connected to the horizontal plate of the upper test plate and is located at the bottom of the horizontal plate of the upper test plate. The upper test plate and the lower test plate have through holes of the same size and coaxiality in the center, through which the explosive bolt passes and is fixed. The horizontal plate of the upper test plate is used to install the capture buffer device. After the explosive bolt explodes, the separation screw body and the separation bolt body separate, and the separation screw body is captured by the capture buffer device.

[0011] The upper test plate, lower test plate, and adapter fixing fixture are equivalent to the installation structure and boundary on the arrow to ensure that the impact transmission path is consistent with the actual connection structure on the arrow.

[0012] The first separation impact sensor is fixed on the horizontal plate of the upper test plate and is used to collect the impact response generated by the separation screw body mounting surface of the explosive bolt; the second separation impact sensor is fixed on the vertical plate of the upper test plate and is used to collect the impact response generated on the instrument mounting surface after the explosive bolt has been operated.

[0013] Preferably, the test platform for evaluating the impact reduction of the capture buffer device further includes a bolt body capture fixture, which is fixed on the lower test plate to accommodate the bolt body and prevent the high-speed bolt body from moving randomly when the explosive bolt is in action.

[0014] Preferably, the aforementioned test platform for evaluating the impact reduction of a capture buffer device further includes a velocity measuring device for collecting the incident velocity and rebound velocity of the separation screw.

[0015] Preferably, the first separation impact sensor, the second separation impact sensor, the optical signal transmitter, and the optical signal receiver constitute a data acquisition system. The data acquisition system and the explosive bolt ignition system are synchronized, that is, after the explosive bolt ignition system emits an ignition signal, the first separation impact sensor, the second separation impact sensor, and the optical signal receiver simultaneously begin data acquisition, so as to realize the synchronous acquisition of the impact response generated on the explosive bolt mounting surface after the separation screw is captured by the capture buffer device, the impact response generated on the instrument mounting surface, and the incident velocity and rebound velocity of the separation screw.

[0016] Another technical problem solved by this invention is: a test method based on the above-mentioned test platform suitable for evaluating the impact reduction of a capture buffer device, the method comprising the following steps:

[0017] S1. Construct the aforementioned experimental platform;

[0018] S2. Install and fix the explosion bolts in the center through holes of the upper test plate horizontal plate and the lower test plate;

[0019] S3. Ignite the explosive bolt and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when no impact reduction measures are taken through the first separation impact sensor and the second separation impact sensor (4), respectively, and collect the incident velocity and rebound velocity of the separation screw body; the impact response is a time-domain acceleration spectrum;

[0020] S4. Install and fix the explosive bolts in the center through holes of the upper test plate and the lower test plate, and then install the capture buffer device on the upper test plate to protect the explosive bolts.

[0021] S5. Ignite the explosive bolt, and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when the impact reduction measures are taken through the first separation impact sensor and the second separation impact sensor, respectively, and collect the incident velocity and rebound velocity of the separation screw body;

[0022] S6. Convert the time-domain acceleration spectrum obtained in steps S3 and S5 into an absolute maximum acceleration impact response spectrum. Calculate the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures are taken relative to the peak value before the impact reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity within the frequency domain of the instrument's response.

[0023] S7. Evaluate the shock reduction performance of the capture buffer device based on the degree of reduction in the peak value of the impact response spectrum of the absolute maximum acceleration before the shock reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity.

[0024] Preferably, by improving the recursive digital filtering algorithm, the time-domain acceleration spectrum obtained from the first and second separate impact sensors is converted into the absolute maximum acceleration impact response spectrum.

[0025] Preferably, the degree of reduction M in the peak value of the impact response spectrum after the impact reduction measures relative to the value before the impact reduction measures is:

[0026]

[0027] In the formula, Max(SRS) a (f) represents the peak value of the absolute maximum acceleration impact response spectrum before impact reduction measures are taken, Max(SRS)b (f) represents the peak value of the absolute maximum acceleration impact response spectrum after impact reduction measures are taken.

[0028] Preferably, the degree to which the rebound velocity of the separating screw body decreases relative to the incident velocity, Q, is:

[0029]

[0030] Among them, V a V is the incident velocity of the separating screw body. b The rebound speed of the separation screw body.

[0031] Preferably, the greater the reduction in the peak value of the impact stress spectrum of the absolute maximum acceleration after the impact reduction measures compared to before the impact reduction measures, the better.

[0032] Another technical solution of the present invention is: a test method for evaluating the shock reduction performance of a capture and buffer device, applicable to evaluating the shock reduction performance of different capture and buffer devices using the same instrument and equipment, comprising the following steps:

[0033] S11, the degree of reduction in the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures are obtained after the first capture buffer device; and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity;

[0034] S12, the degree of reduction in the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measure after obtaining the impact reduction measure corresponding to the second capture buffer device; M2, the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity; Q2.

[0035] S13. When the degree of reduction M of the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures is different, the greater the degree of reduction M of the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures, the better the impact reduction performance of the corresponding capture buffer device.

[0036] When the reduction in the peak value of the impact response spectrum of the absolute maximum acceleration after the impact reduction measures is the same as that before the impact reduction measures, the greater the reduction in the rebound velocity of the separation screw relative to the incident velocity, the better the impact reduction performance of the corresponding capture buffer device.

[0037] The beneficial effects of this invention compared to the prior art are:

[0038] (1) The test platform of the present invention effectively simulates the installation structure and boundary on the arrow, ensuring that the generated impact transmission path is consistent with the real connection structure on the arrow, and effectively restores the real impact level on the arrow.

[0039] (2) The test platform of the present invention has a simple structure, which facilitates the conduct of tests and can be reused, saving costs and improving test efficiency.

[0040] (3) The test platform of the present invention can realize the simultaneous measurement of multiple parameters such as the separation impact response of the explosive bolt mounting surface, the separation impact response of the instrument mounting surface, the incident velocity and rebound velocity of the separation screw body;

[0041] (4) The present invention comprehensively evaluates the impact reduction performance of the capture buffer device, and the evaluation results are more reasonable and accurate.

[0042] (5) The explosive bolt mounting surface separation impact response affects the rocket body structure attitude at the separation time, and the instrument mounting surface separation impact response affects the performance of precision instruments and equipment at the separation time. By simultaneously measuring the explosive bolt mounting surface separation impact response and the instrument mounting surface separation impact response, a single test can effectively cover the main indicators of concern for the rocket body structure and instruments and equipment.

[0043] (6) By comparing and analyzing the impact response of the explosive bolt mounting surface and the instrument mounting surface, the impact response law of the explosive bolt mounting surface and the instrument mounting surface can be obtained.

[0044] (7) The present invention has wide applicability and can be used to evaluate the impact reduction performance of different interface capture buffer devices, realize the comparative analysis of the impact reduction performance between different capture buffer devices, and provide a reference for the selection of rocket explosive bolt capture buffer devices. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the test platform structure for the capture buffer device according to an embodiment of the present invention.

[0046] Figure 2 This is a side view of the test platform for the capture buffer device according to an embodiment of the present invention.

[0047] Figure 3 This is a schematic diagram of the test board structure on the test platform of the capture buffer device according to an embodiment of the present invention.

[0048] Figure 4 This is a schematic diagram of the test board structure under the test platform of the capture buffer device according to an embodiment of the present invention.

[0049] Figure 5 This is a schematic diagram of the tooling structure for capturing the separated bolt body according to an embodiment of the present invention.

[0050] Figure 6 This is a schematic diagram of the transfer and fixing fixture structure of the test platform for the capture buffer device in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will be further described below with reference to the embodiments.

[0052] To address the current lack of a reasonable and accurate means to compare and evaluate the impact reduction performance of different capture and buffer devices, this invention employs an equivalent simulation of the on-arrow mounting structure and boundaries to establish a multi-parameter testing platform that measures the impact response of the explosive bolt mounting surface separation, the impact response of the instrument and equipment mounting surface separation, the incident velocity of the separation bolt body, and the rebound velocity, thereby achieving a comprehensive evaluation of the impact reduction effect of the capture and buffer device.

[0053] like Figure 1 As shown, the test platform for the capture buffer device includes an upper test plate 1, a lower test plate 2, a first separation impact sensor 3, a second separation impact sensor 4, a light signal transmitter, a photoelectric target sensor 5, a transfer fixing fixture 6, and a separation bolt capture fixture 7.

[0054] The adapter fixing fixture 6 is used to fix it on a horizontal surface; the structure of the adapter fixing fixture 6 is as follows: Figure 6 As shown.

[0055] The upper test plate 1 is L-shaped, including a vertical plate and a horizontal plate. The vertical plate of the upper test plate 1 is fixed to the adapter fixing fixture 6. The lower test plate 2 is fixedly connected to the horizontal plate of the upper test plate 1 and is located at the bottom of the horizontal plate of the upper test plate 1.

[0056] The upper test plate 1 and the lower test plate 2 have through holes of the same size and coaxiality at their center, which are used for the explosive bolts to pass through the through holes at the center of the lower test plate 2 and the upper test plate 1 respectively and to be fixed. The upper test plate 1 is also used to install the capture buffer device 8. The capture buffer device 8 is installed in conjunction with the explosive bolt. After the explosive bolt explodes, the separation screw body and the separation bolt body separate, and the separation screw body is captured by the capture buffer device 8.

[0057] Upper test plate 1, lower test plate 2, and adapter fixing fixture 6 are equivalent to simulate the installation structure and boundary on the arrow, ensuring that the impact transmission path is consistent with the actual connection structure on the arrow.

[0058] The bolt-separating device 7 is fixed on the lower test plate 2 to accommodate the bolt-separating body, preventing it from moving freely at high speed during operation and potentially injuring test personnel or damaging test equipment. The bolt-separating device 7 has a through hole in its center for connecting the explosive bolt ignition control cable to the explosive bolt 9. The bolt-separating body is as follows: Figure 5 As shown.

[0059] The first separation impact sensor 3 is fixed on the horizontal plate of the upper test plate 1 and is used to collect the impact response generated by the explosive bolt mounting surface of the separation screw body; the second separation impact sensor 4 is fixed on the vertical plate of the upper test plate 1 and is used to collect the impact response generated by the instrument mounting surface of the separation screw body. The impact response is a time-domain acceleration spectrum, with time on the horizontal axis and acceleration on the vertical axis.

[0060] The number of sensors can be increased as needed, including the first separation impact sensor 3 and the second separation impact sensor 4. Generally, the first separation impact sensor 3 includes at least a near-field test point (75mm from the center point of the explosive bolt installation), a mid-field test point (150mm from the center point of the explosive bolt installation), and a far-field test point (250mm from the center point of the explosive bolt installation).

[0061] The speed measuring device is a photoelectric target sensor, which includes a light signal transmitter, a light signal receiver 5, and an external special fixture 10. The light signal transmitter and light signal receiver 5 are fixedly mounted in pairs on the external special fixture 10 and do not contact the test platform. A small hole is provided on the capture buffer device to allow the light path of the photoelectric target sensor to pass through. By reasonably setting the small hole and the positions of the light signal transmitter and light signal receiver 5 of the photoelectric target sensor, the incident velocity and rebound velocity of the separation screw are collected. The specific speed measuring principle is as follows:

[0062] The optical signal transmitter and optical signal receiver 5 are fixedly installed in pairs on the external special tooling 10 without contacting the test platform. The capture buffer device has a small hole for the optical path to pass through. The photoelectric signal is collected by any two optical signal receivers 5. The moment of switching between the presence and absence of the photoelectric signal and the distance between the two optical signal receivers 5 are used to calculate the incident velocity and rebound velocity of the separation screw.

[0063] Before the explosion, the light signal emitted by the light signal transmitter could be received by the light signal receiver 5 through the small hole on the capture buffer device; after the explosion, the separation screw moved upward, gradually blocking the light signal emitted by the light signal transmitter, causing the signal received by the light signal receiver 5 to be disconnected one after another.

[0064] The incident velocity of the separating screw body is calculated by collecting the time when the photoelectric signal is disconnected and the distance between the two photoelectric signal receivers 5;

[0065] As the separating screw continues to move upward, it hits the capture buffer and bounces back, changing from upward to downward motion. As the separating screw moves downward, the blocked light signal is received again by the light signal receiver 5.

[0066] The rebound speed of the separating screw is calculated by taking the time it takes for the photoelectric signal to be received again by the two optical signal receivers 5 and the distance between the two optical signal receivers 5.

[0067] By changing the size of the through holes in the center of the upper test plate 1 and the lower test plate 2, as well as the structure and material of the upper test plate 1 and the lower test plate 2, the impact reduction performance of the capture buffer device 8 with different installation interfaces and different installation boundaries can be tested.

[0068] Based on the above-mentioned test platform, the present invention provides a test method suitable for evaluating the impact reduction of a capture buffer device, the method comprising the following steps:

[0069] S1. Construct the aforementioned experimental platform;

[0070] S2. Install and fix the explosion bolts in the center through holes of the upper test plate 1 horizontal plate and the lower test plate 2;

[0071] S3. Ignite the explosive bolt, and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when no impact reduction measures are taken through the first separation impact sensor 3 and the second separation impact sensor 4, respectively. Collect the incident velocity and rebound velocity of the separation screw body; the impact response is a time-domain acceleration spectrum.

[0072] S4. Install and fix the explosive bolt on the horizontal plate of the upper test plate 1 and the central through hole of the lower test plate 2, and then install the capture buffer device 8 on the horizontal plate of the upper test plate 1 to cover the upper half of the explosive bolt.

[0073] S5. Ignite the explosive bolt, and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when the first separation impact sensor 3 and the second separation impact sensor 4 are taken respectively, and collect the incident velocity and rebound velocity of the separation screw body.

[0074] S6. Convert the time-domain acceleration spectrum obtained in steps S3 and S5 into an absolute maximum acceleration impact response spectrum. Calculate the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures are taken relative to the peak value before the impact reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity within the frequency domain of the instrument's response.

[0075] By improving the recursive digital filtering algorithm, the time-domain acceleration spectrum obtained from the first separation impact sensor 3 and the second separation impact sensor 4 is transformed into the absolute maximum acceleration impact response spectrum.

[0076] The degree of reduction M in the peak value of the impact response spectrum after the impact reduction measures relative to the initial absolute maximum acceleration impact response spectrum is:

[0077]

[0078] In the formula, Max(SRS) a (f) represents the peak value of the absolute maximum acceleration impact response spectrum before impact reduction measures are taken, Max(SRS)b (f) represents the peak value of the absolute maximum acceleration impact response spectrum after impact reduction measures are taken.

[0079] The degree to which the rebound velocity of the separating screw body decreases relative to the incident velocity, Q, is:

[0080]

[0081] Among them, V a V is the incident velocity of the separating screw body. b The rebound speed of the separation screw body.

[0082] S7. The impact reduction effect of the capture buffer device 8 is evaluated based on the degree of reduction in the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity.

[0083] The greater the reduction in the peak value of the impact response spectrum of the absolute maximum acceleration after the impact reduction measures compared to before the impact reduction measures, the better.

[0084] This invention also provides a test method for evaluating the shock reduction performance of different capture and buffer devices in the same instrument and equipment, the method comprising the following steps:

[0085] S11. Using the above method, the degree of reduction of the peak value of the impact response spectrum of the first capture buffer device relative to the impact reduction measures is M1, and the degree of reduction of the rebound velocity of the separation screw relative to the incident velocity is Q1.

[0086] S12, The degree of reduction of the peak value of the impact response spectrum of the second capture buffer device after the impact reduction measures are obtained by means of the above method, M2, and the degree of reduction of the rebound velocity of the separation screw relative to the incident velocity, Q2.

[0087] S13. When the degree of reduction M of the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures is different, the greater the degree of reduction M of the peak value of the impact response spectrum of the absolute maximum acceleration before the impact reduction measures, the better the impact reduction performance of the corresponding capture buffer device.

[0088] The degree of reduction (M) in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures were taken relative to the value without the impact reduction measures was used as the main impact reduction evaluation result, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity was used as the auxiliary impact reduction evaluation result.

[0089] When the reduction in the peak value of the impact response spectrum of the absolute maximum acceleration after the impact reduction measures is the same as that before the impact reduction measures, the greater the reduction in the rebound velocity of the separation screw relative to the incident velocity, the better the impact reduction performance of the corresponding capture buffer device.

[0090] When comparing the impact reduction performance of different capture and buffer devices, it is necessary to keep the relative positions of the separation impact sensor 3 and the separation impact sensor 4 from the impact source consistent;

[0091] Example:

[0092] like Figure 1 Schematic diagram of the test platform structure for the capture buffer device and Figure 2 As shown in the side view of the capture buffer device test platform, the capture buffer device test platform provided in a specific embodiment of the present invention includes an upper test plate 1, a lower test plate 2, a separation impact sensor 3, a separation impact sensor 4, an optical signal transmitter, an optical signal receiver 5, a conversion fixing fixture 6, and a separation bolt capture fixture 7.

[0093] The upper test plate 1 is made of aluminum plate with a thickness of 10-20mm. The lower test plate 2 is made of aluminum plate with a thickness of 10-20mm. The thickness can be adjusted according to the actual situation. The adapter fixing fixture 6 is made of steel with a thickness of 10-20mm. The separation bolt body capturing fixture 7 is made of steel with a wall thickness of 5-10mm.

[0094] The upper test plate 1 is fixed to the adapter fixture 6 with bolts through four through holes. Φ25 through holes are opened in the center of the upper test plate 1 and the lower test plate 2. Explosion bolts are fixed by passing through the Φ25 through holes in the center of the lower test plate 2 and the upper test plate 1 respectively. The capture buffer device 8 is fixed on the upper test plate 1 through four Φ9 through holes. The bolt-separation capture fixture 7 is fixed to the lower test plate 2 through four Φ6.5 through holes to prevent the high-speed bolt body from moving arbitrarily during the action of the explosive bolt, which could injure test personnel or damage test instruments and equipment. A Φ30 through hole is opened in the center of the bolt-separation capture fixture 7 for connecting the explosive bolt ignition control cable to the explosive bolt 9. The first separation impact sensor 3 is fixed to the upper end face of the upper test plate 1 through a threaded hole to collect the impact response of the bolt body on the mounting surface of the explosive bolt. The second separation impact sensor 4 is fixed to the side wall of the upper test plate 1 through a threaded hole to collect the impact response of the bolt body on the mounting surface of the instrument. The optical signal transmitter and optical signal receiver 5 are fixed to the external special fixture 10 through threaded holes, without contacting the test platform to avoid affecting the photoelectric target. The capture buffer device has a small hole for the optical target sensor to pass through. By reasonably setting the small hole for the optical target sensor to pass through and the positions of the optical signal transmitter and optical signal receiver 5, the incident velocity and rebound velocity of the bolt body are collected.

[0095] The through holes at the center of the upper test plate 1 and the lower test plate 2 are of the same size and coaxial. By changing the size of the through holes at the center of the upper test plate 1 and the lower test plate 2, the impact reduction performance of the capture buffer device 8 with different installation interfaces can be tested. The thickness of the lower test plate 2 can also be changed according to the actual use.

[0096] The first separation impact sensor 3, the second separation impact sensor 4, and the capture buffer device 7 are fixed to the upper test plate 1 by screws, and the separation bolt body capture fixture 7 is fixed to the lower test plate 2 by screws.

[0097] The number and position of the first separation impact sensor 3 and the second separation impact sensor 4 can be adjusted as needed, and they can be fixed at different positions on the upper test plate 1 from the impact source to collect the impact response at different distances from the impact source. When comparing the impact reduction performance of different capture and buffer devices, the relative positions of the separation impact sensor 3 and the separation impact sensor 4 from the impact source must be kept consistent.

[0098] The present invention provides a test method for evaluating the impact reduction of a capture buffer device, which specifically includes the following steps:

[0099] 1) Installation of adapter fixing fixture 6: Fix it to the horizontal ground by passing 4 screws through the 4 through holes at the bottom of the adapter fixing fixture 6. After installation, ensure that the fixing platform of adapter fixing fixture 6 remains horizontal.

[0100] 2) Installation of the upper test plate 1: Secure the upper test plate 1 with nuts by passing four bolts through the four through holes of the adapter fixing fixture 6. After installation, ensure that the mounting surface of the product to be tested on the upper test plate 1 remains horizontal; the upper test plate 1... Figure 3 As shown, the lower test board is as follows Figure 4 As shown,

[0101] 3) Installation of explosive bolt 9: Pass the explosive bolt 9 through the center holes of the lower test plate 2 and the upper test plate 1 in sequence for fixing, ensuring that the center holes of the lower test plate 2 and the upper test plate 1 are coaxial, and apply the specified torque value, which is consistent with the actual installation torque value on the arrow;

[0102] 4) Installation of capture buffer device 8: Secure the capture buffer device to the upper test plate 1 with 4 screws;

[0103] 5) Installation of the bolt body capture fixture 7: Pass the explosion bolt ignition control cable through the center hole of the bolt body capture fixture 7, and then fix the bolt body capture fixture 7 to the lower test plate 2 with 4 screws.

[0104] 6) Installation of Separation Impact Sensor 3 and Separation Impact Sensor 4: Fix the separation impact sensor 3 and separation impact sensor 4 to the upper test plate 1 with screws. When comparing the impact reduction performance of different capture buffer devices, it is necessary to keep the relative positions of the separation impact sensor 3 and separation impact sensor 4 from the impact source consistent.

[0105] 7) Installation of optical signal transmitter and optical signal receiver 5: Fix the optical signal transmitter and optical signal receiver 5 to the external special fixture 10 through threaded holes. The external special fixture 10 is fixed on a horizontal ground and does not contact the test platform to avoid affecting the photoelectric target. The capture buffer device has a small hole for the light path of the photoelectric target sensor to pass through. By reasonably setting the position of the small hole for the light path of the photoelectric target sensor and the position of the optical signal receiver 4, the incident velocity and rebound velocity of the separation screw are collected.

[0106] 8) After all the above operations are completed, the explosive bolt is ignited. The impact response value collected by the separation impact sensor 3 and the separation impact sensor 4 and the degree of reduction of the rebound speed of the separation screw relative to the incident velocity are used to comprehensively evaluate the impact reduction performance of the capture buffer device.

[0107] When testing the impact reduction performance of different capture buffer devices 8, it is necessary to ensure that the connection method of the upper test plate 1 and the adapter fixing fixture 6 and the fixing method of the adapter fixing fixture 6 are consistent, so as to avoid the boundary from affecting the test results as much as possible.

[0108] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A test method suitable for evaluating the impact reduction of a capture buffer device, characterized in that... Includes the following steps: S1. Set up the test platform; the test platform includes an upper test plate (1), a lower test plate (2), a first separation impact sensor (3), a second separation impact sensor (4), a transfer fixing fixture (6), and a speed measuring device; The adapter fixture (6) is used to fix the device on a horizontal surface; The upper test plate (1) is L-shaped, including a vertical plate and a horizontal plate. The vertical plate is connected and fixed to the adapter fixing fixture (6). The lower test plate (2) is fixedly connected to the horizontal plate of the upper test plate (1) and is located at the bottom of the horizontal plate of the upper test plate (1); the upper test plate (1) and the lower test plate (2) have through holes of the same size and coaxiality in the center, which are used for the explosive bolt to pass through and be fixed. The upper test plate (1) is used to install the capture buffer device (8). After the explosive bolt explodes, the separation screw body and the separation bolt body separate, and the separation screw body is captured by the capture buffer device (8). The upper test plate (1), lower test plate (2), and adapter fixing fixture (6) are equivalent to the installation structure and boundary on the arrow to ensure that the impact transmission path is consistent with the actual connection structure on the arrow. The first separation impact sensor (3) is fixed on the horizontal plate of the upper test plate (1) and is used to collect the impact response generated by the mounting surface of the explosive bolt separation screw body; the second separation impact sensor (4) is fixed on the vertical plate of the upper test plate (1) and is used to collect the impact response generated by the explosive bolt on the mounting surface of the instrument after it has worked; it also includes a separation bolt body capturing fixture (7), which is fixed on the lower test plate (2) to accommodate the separation bolt body and prevent the high-speed separation bolt body generated by the explosive bolt from moving randomly when it is in action; The velocity measuring device is used to collect the incident velocity and rebound velocity of the separator screw. The first separation impact sensor (3), the second separation impact sensor (4), the optical signal transmitter, and the optical signal receiver (5) constitute a data acquisition system. The data acquisition system and the explosive bolt ignition system are in a synchronized state, that is: the ignition system has an output signal, which is given to the first separation impact sensor (3), the second separation impact sensor (4), and the optical signal receiver (5). After the explosive bolt ignition system sends out the ignition signal, the acquisition system starts timing. The first separation impact sensor (3), the second separation impact sensor (4), and the optical signal receiver (5) start data acquisition work at the same time, so as to realize the synchronous acquisition of the impact response generated on the explosive bolt mounting surface, the impact response generated on the instrument mounting surface, and the incident velocity and rebound velocity of the separation screw body after being captured by the capture buffer device (8). S2. Install and fix the explosion bolts in the center through holes of the upper test plate (1) horizontal plate and the lower test plate (2); S3. Ignite the explosive bolt and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when no impact reduction measures are taken through the first separation impact sensor (3) and the second separation impact sensor (4), respectively. Collect the incident velocity and rebound velocity of the separation screw body; the impact response is a time-domain acceleration spectrum. S4. Install and fix the explosive bolt in the center through hole of the upper test plate (1) horizontal plate and the lower test plate (2), and then install the capture buffer device (8) on the upper test plate (1) horizontal plate to protect the explosive bolt; S5. Ignite the explosive bolt and collect the impact response of the explosive bolt mounting surface and the instrument mounting surface when the impact reduction measures are taken through the first separation impact sensor (3) and the second separation impact sensor (4), respectively, and collect the incident velocity and rebound velocity of the separation screw body. S6. Convert the time-domain acceleration spectrum obtained in steps S3 and S5 into an absolute maximum acceleration impact response spectrum. Calculate the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures are taken relative to the peak value before the impact reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity within the frequency domain of the instrument's response. S7. The impact reduction performance of the capture buffer device (8) is evaluated based on the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures compared to before the impact reduction measures, and the degree of reduction in the rebound velocity of the separation screw relative to the incident velocity.

2. A test method for evaluating the impact reduction of a capture buffer device, as described in claim 1, characterized in that, By improving the recursive digital filtering algorithm, the time-domain acceleration spectrum obtained by the first separation impact sensor (3) and the second separation impact sensor (4) is transformed into the absolute maximum acceleration impact response spectrum.

3. A test method for evaluating the impact reduction of a capture buffer device, as described in claim 1, characterized in that, The degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures compared to before the impact reduction measures. for: In the formula, The peak value of the absolute maximum acceleration impact response spectrum before impact reduction measures are taken. The peak value of the absolute maximum acceleration impact response spectrum after impact reduction measures are taken.

4. A test method for evaluating the impact reduction of a capture buffer device, as described in claim 1, characterized in that, The degree to which the rebound velocity of the separating screw body decreases relative to the incident velocity, Q, is: in, The incident velocity of the separating screw body, The rebound speed of the separation screw body.

5. A test method for evaluating the impact reduction of a capture buffer device, as described in claim 1, characterized in that, The degree of reduction in the peak value of the absolute maximum acceleration impact stress spectrum after impact reduction measures compared to before impact reduction measures The bigger the better.

6. A test method applicable to evaluating the impact reduction performance of different capture and buffer devices within the same instrument and equipment, the evaluation steps including: S11. Using the test method described in claim 1 for evaluating the impact reduction of a capture buffer device, the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures for the first capture buffer device are obtained relative to before the impact reduction measures. The degree to which the rebound velocity of the separator screw decreases relative to the incident velocity. ; S12. The degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures corresponding to the second capture buffer device are obtained using the above method, relative to the state before the impact reduction measures. The degree to which the rebound velocity of the separator screw decreases relative to the incident velocity. ; S13. The degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after impact reduction measures are implemented, relative to before the impact reduction measures. At the same time, the degree of reduction in the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures compared to before the impact reduction measures. The larger the value, the better the shock absorption performance of the corresponding capture and buffer device; The degree to which the peak value of the absolute maximum acceleration impact response spectrum decreases after impact reduction measures compared to before impact reduction measures. At the same time, the greater the degree Q of the decrease in the rebound velocity of the separating screw relative to the incident velocity, the better the impact reduction performance of the corresponding capture buffer device.

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