Test platform and test method suitable for impact reduction evaluation of capture buffer device

Abstract

The invention relates to a test platform and a test method suitable for impact reduction evaluation of a capture buffer device. The test platform comprises an upper test plate, a lower test plate and a switching fixing tool, and is used for equivalently simulating an on-rocket mounting structure and a boundary; the switching fixing tool is used for being fixed to the horizontal ground. The upper test plate comprises a vertical plate and a horizontal plate, and the vertical plate is fixedly connected with the adapter fixing tool; the lower test plate is fixed at the bottom of the horizontal plate of the upper test plate; coaxial through holes which are the same in size are formed in the center of the horizontal plate of the upper test plate and the center of the lower test plate, an explosive bolt penetrates through the through holes and is fixed, a separation screw body and a separation bolt body are separated after the explosive bolt explodes, and the separation screw body is captured by a capturing buffer device; the first separation impact sensor is used for collecting impact response generated when the explosive bolt is separated from the mounting surface of the screw body; and the second separation impact sensor is used for collecting impact response generated on the instrument mounting surface after the explosive bolt works.

Description

Technical Field

[0001] The invention belongs to the technical field of a capture buffer device impact reduction evaluation test method, and relates to a test platform and a test method suitable for capturing a buffer device impact reduction evaluation. Background Art

[0002] As the earliest separation device, explosive bolts have the outstanding advantages of high reliability and low cost, and are widely used in interstage separation of rocket body structures and satellite-rocket separation. During the operation, the explosive bolt will produce a high-speed separation screw body along the axial direction of the device, and when it hits the rocket body structure, it will produce an impact response with high frequency, high acceleration amplitude and high strain rate, which may cause damage or failure of equipment installed in nearby structures. It is necessary to set up a capture buffer device to capture and buffer the high-speed separation bolt body to reduce the impact response of the high-speed separation bolt body caused by hitting the rocket body structure.

[0003] At present, the impact reduction performance of the capture buffer device is generally evaluated by measuring the impact response generated by the product through a real ground separation test. However, since the impact level generated is closely related to the installation boundary, it is difficult to evaluate the impact levels generated by different capture buffer devices and the same capture buffer device at different installation boundaries. At the same time, due to the limitation of the installation space of the rocket body structure, the placement position of the separation impact sensor is different for different models. The new model cannot directly refer to the impact response test results of the previous models, and repeated tests are required.

[0004] In addition, the current evaluation of the impact reduction performance of the capture buffer device is based on the size of the impact response value before and after the capture buffer device is taken. The evaluation index is relatively simple, and the impact response is greatly affected by the external environment. The impact response value obtained in the test has a large dispersion, and it is difficult to accurately evaluate the impact reduction performance of the capture buffer device.

[0005] The high-speed separation screw body generated by the explosive bolt during its action process hits the arrow body structure, which is an important source of impact for the separation shock. Adding a capture buffer device to capture the separation screw body and reduce the rebound speed of the separation screw body is an important means to reduce the impact response. Therefore, the difference between the rebound speed of the separation screw body and the incident speed is another key indicator for judging the impact reduction performance of the capture buffer device. Summary of the invention

[0006] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, disclose a test platform and a test method suitable for evaluating the impact reduction performance of a capture buffer device, and reasonably and accurately evaluate the impact reduction performance of the capture buffer device.

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

[0008] The transfer fixing tool is used to fix on the horizontal ground;

[0009] The upper test plate is L-shaped, including a vertical plate and a horizontal plate, and the vertical plate is connected and fixed to the transfer fixing 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 horizontal plate of the upper test plate and the central part of the lower test plate are provided with through holes of the same size and coaxial, for the explosive bolts to pass through and be fixed therein; the horizontal plate of the upper test plate is used to install a capture buffer device; after the explosive bolt explodes, the separation screw body and the separation bolt body are separated, and the separation screw body is captured by the capture buffer device;

[0011] The upper test plate, lower test plate, and transfer fixture simulate the installation structure and boundaries 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 installation surface of the explosive bolt separation screw body; 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 installation surface after the explosive bolt works.

[0013] Preferably, the above-mentioned test platform suitable for capturing and buffering device impact reduction evaluation also includes a separation bolt body capture tool, which is fixed on the lower test plate to accommodate the separation bolt body and avoid random movement of the high-speed separation bolt body generated when the explosive bolt is in action.

[0014] Preferably, the above-mentioned test platform suitable for capturing and evaluating the impact reduction of the buffer device further comprises a speed measuring device for collecting the incident speed and rebound speed of the separation screw body.

[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, and the data acquisition system is in a time-synchronized state with the explosive bolt ignition system, that is, after the explosive bolt ignition system sends an ignition signal, the first separation impact sensor, the second separation impact sensor and the optical signal receiver start data acquisition at the same time, so as to realize the synchronous acquisition of the impact response generated on the explosive bolt mounting surface after the separation screw body 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 body.

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

[0017] S1. Build the above test platform;

[0018] S2. Install and fix the explosive bolts in the horizontal plate of the upper test plate and the central through hole of the lower test plate;

[0019] S3, igniting the explosive bolt, collecting the impact response of the explosive bolt installation surface and the instrument installation surface when no impact reduction measures are taken through the first separation impact sensor and the second separation impact sensor (4), and collecting the incident speed and rebound speed of the separation screw body; the impact response is a time domain acceleration spectrum;

[0020] S4, installing and fixing the explosive bolts on the horizontal plate of the upper test plate and the central through hole of the lower test plate, and then installing the capture buffer device on the horizontal plate of the upper test plate to protect the explosive bolts;

[0021] S5, igniting the explosive bolt, collecting the impact responses 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, and collecting the incident speed and rebound speed of the separation screw body;

[0022] S6, converting the time domain acceleration spectra acquired twice in step S3 and step S5 into an absolute maximum acceleration shock response spectrum, calculating within the response frequency domain of the instrument and equipment, the absolute reduction degree of the peak value of the maximum acceleration shock response spectrum after the shock reduction measures are taken relative to the peak value before the shock reduction measures are taken, and the reduction degree of the rebound velocity of the separation screw body relative to the incident velocity;

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

[0024] Preferably, the time domain acceleration spectra obtained by testing the first separation shock sensor and the second separation shock sensor are converted into absolute maximum acceleration shock response spectra by improving the recursive digital filtering algorithm.

[0025] Preferably, the degree of reduction M of the peak value of the absolute maximum acceleration shock response spectrum after the shock reduction measure relative to before the shock reduction measure is:

[0026]

[0027] Where, Max(SRS a (f)) is the absolute maximum acceleration shock response spectrum peak before taking shock reduction measures, Max(SRSb (f)) is the peak value of the absolute maximum acceleration shock response spectrum after taking shock reduction measures.

[0028] Preferably, the degree Q of reduction of the rebound speed of the separation screw body relative to the incident speed is:

[0029]

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

[0031] Preferably, the greater the reduction degree M of the absolute maximum acceleration shock stress spectrum peak after the shock reduction measure relative to before the shock reduction measure, the better.

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

[0033] S11, obtaining the degree of reduction M of the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measure corresponding to the first capture buffer device relative to before and after the impact reduction measure. 1 , the degree to which the rebound speed of the separation screw body is reduced relative to the incident speed Q 1 ;

[0034] S12, obtaining the degree of reduction M of the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measure corresponding to the second capture buffer device relative to before and after the impact reduction measure. 2 , the degree to which the rebound speed of the separation screw body is reduced relative to the incident speed Q 2 ;

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

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

[0037] The beneficial effects of the present invention compared with the prior art are:

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

[0039] (2) The test platform of the present invention has a simple structure, is easy to carry out test, and can be reused, saving costs and improving test efficiency;

[0040] (3) The test platform of the present invention can realize multi-parameter synchronous measurement of the separation impact response of the explosive bolt installation surface, the separation impact response of the instrument installation surface, the separation screw body incident speed and rebound speed;

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

[0042] (5) The separation impact response of the explosive bolt mounting surface of the present invention affects the posture of the rocket body structure at the moment of separation, and the separation impact response of the instrument mounting surface affects the performance of the precision instrument equipment at the moment of separation. By synchronously measuring the separation impact response of the explosive bolt mounting surface and the separation impact response of the instrument mounting surface, one test can effectively cover the main focus indicators of the rocket body structure and the instrument equipment.

[0043] (6) The present invention can obtain the impact response rules of the explosive bolt installation surface and the instrument installation surface by comparing and analyzing the separation impact response of the explosive bolt installation surface and the separation impact response of the instrument installation surface.

[0044] (7) The present invention has wide adaptability and can be used to evaluate the impact reduction performance of capture buffer devices with different interfaces, realize comparative analysis of the impact reduction performance between different capture buffer devices, and provide a reference for the selection of explosive bolt capture buffer devices on arrows. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0049] Figure 5 It is a schematic diagram of the structure of the bolt body separation capture tooling according to an embodiment of the present invention.

[0050] Figure 6 It is a schematic diagram of the structure of the transfer and fixing tooling of the capture buffer device test platform according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the embodiments.

[0052] In order to solve the problem of the current lack of means for reasonably and accurately comparing and evaluating the impact reduction performance of different capture buffer devices, the present invention adopts an equivalent simulation of the mounting structure and boundary on the arrow, and establishes a multi-parameter test platform for the separation impact response of the explosive bolt mounting surface, the separation impact response of the instrument and equipment mounting surface, the separation bolt body incident velocity and rebound velocity, etc., to achieve a comprehensive evaluation of the impact reduction effect of the capture buffer device.

[0053] like Figure 1 As shown, the capture buffer device 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, an optical signal transmitter, a photoelectric target sensor 5, a transfer fixing tool 6, and a separation bolt body capture tool 7.

[0054] The transfer fixing tool 6 is used to fix on the horizontal ground; the transfer fixing tool 6 has a structure as shown in Figure 6 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 transfer 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 horizontal plate of the upper test plate 1 and the center of the lower test plate 2 are provided with through holes of the same size and coaxial, for the explosive bolts to pass through the center through holes of the lower test plate 2 and the upper test plate 1 respectively and be fixed. The horizontal plate of the upper test plate 1 is also used to install the capture buffer device 8, which is installed in conjunction with the explosive bolt. After the explosive bolt explodes, the separation screw body and the separation bolt body are separated, and the separation screw body is captured by the capture buffer device 8;

[0057] The upper test plate 1, the lower test plate 2, and the transfer fixture 6 are equivalent to simulate the installation structure and boundary on the arrow to ensure that the impact transmission path generated is consistent with the real connection structure on the arrow;

[0058] The separation bolt body capture tool 7 is fixed on the lower test plate 2 to accommodate the separation bolt body to prevent the high-speed separation bolt body from moving randomly when the explosive bolt is in action, which may injure the test personnel or damage the test equipment. A through hole is provided in the center of the separation bolt body capture tool 7 for connecting the explosive bolt ignition control cable with the explosive bolt 9. Figure 5 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 installation surface of the explosive bolt 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 installation surface of the separation screw body instrument. The impact response is a time domain acceleration spectrum, with the horizontal axis being time and the vertical axis being acceleration;

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

[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 tooling 10; the light signal transmitter and the light signal receiver 5 are fixedly installed in pairs on the external special tooling 10, and do not contact the test platform, wherein a small hole for the light path of the photoelectric target sensor to pass through is opened on the capture buffer device, and the incident speed and rebound speed of the separation screw body are collected by reasonably setting the small hole for the light path of the photoelectric target sensor and the positions of the light signal transmitter and the light signal receiver 5 of the photoelectric target sensor. The specific speed measurement principle is:

[0062] The optical signal transmitter and the optical signal receiver 5 are fixedly installed in pairs on an external special tooling 10 and do not contact the test platform. A small hole for the light path to pass through is opened on the capture buffer device. The photoelectric signal collected by any two optical signal receivers 5 is collected by any two optical signal receivers 5. The switching moment of the photoelectric signal change and the distance between the two optical signal receivers 5 are used to calculate the incident speed and rebound speed of the separation screw body.

[0063] Before the explosion, the optical signal emitted by the optical signal transmitter can be received by the optical signal receiver 5 through the small hole opened on the capture buffer device; after the explosion, the separation screw body moves upward, gradually blocking the optical signal emitted by the optical signal transmitter, causing the signals received by the optical signal receiver 5 to be disconnected one after another;

[0064] The two optical signal receivers 5 collect the time when the photoelectric signal is disconnected and the distance between the two optical signal receivers 5, and calculate the incident speed of the separation screw body;

[0065] As the separation screw body continues to move upward, the separation screw body hits the capture buffer device and rebounds back, converting the upward movement into the downward movement. As the separation screw body moves downward, the blocked light signal is received by the light signal receiver 5 again.

[0066] The two optical signal receivers 5 collect the time when the photoelectric signal is received again and the distance between the two optical signal receivers 5, and calculate the rebound speed of the separation screw body.

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

[0068] Based on the above 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. Build the above test platform;

[0070] S2, install and fix the explosive bolts on the horizontal plate of the upper test plate 1 and the central through hole of the lower test plate 2;

[0071] S3, igniting the explosive bolt, collecting the impact response of the explosive bolt installation surface and the instrument installation surface when no impact reduction measures are taken through the first separation impact sensor 3 and the second separation impact sensor 4, and collecting the incident velocity and rebound velocity of the separation screw body; the impact response is a time domain acceleration spectrum;

[0072] S4, installing and fixing 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 installing 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, igniting the explosive bolt, collecting 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, and collecting the incident speed and rebound speed of the separation screw body;

[0074] S6, converting the time domain acceleration spectra acquired twice in step S3 and step S5 into an absolute maximum acceleration shock response spectrum, calculating within the response frequency domain of the instrument and equipment, the absolute reduction degree of the peak value of the maximum acceleration shock response spectrum after the shock reduction measures are taken relative to the peak value before the shock reduction measures are taken, and the reduction degree of the rebound velocity of the separation screw body relative to the incident velocity;

[0075] By improving the recursive digital filtering algorithm, the time domain acceleration spectrum obtained by testing the first separation shock sensor 3 and the second separation shock sensor 4 is converted into an absolute maximum acceleration shock response spectrum.

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

[0077]

[0078] Where, Max(SRS a (f)) is the absolute maximum acceleration shock response spectrum peak before taking shock reduction measures, Max(SRS b (f)) is the peak value of the absolute maximum acceleration shock response spectrum after taking shock reduction measures.

[0079] The degree of reduction of the rebound speed of the separation screw body relative to the incident speed Q is:

[0080]

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

[0082] S7. Evaluate the shock reduction effect of the capture buffer device 8 according to the degree of reduction in the peak value of the absolute maximum acceleration shock response spectrum after the shock reduction measures relative to before the shock reduction measures, and the degree of reduction in the rebound speed of the separation screw body relative to the incident speed.

[0083] The greater the reduction degree M of the absolute maximum acceleration shock response spectrum peak after the shock reduction measures relative to before the shock reduction measures, the better.

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

[0085] S11, using the above method to obtain the peak reduction degree M of the absolute maximum acceleration impact response spectrum after the impact reduction measures corresponding to the first capture buffer device relative to before and after the impact reduction measures 1 , the degree to which the rebound speed of the separation screw body is reduced relative to the incident speed Q 1 ;

[0086] S12, using the above method to obtain the degree of reduction M of the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures corresponding to the second capture buffer device relative to before and after the impact reduction measures. 2 , the degree to which the rebound speed of the separation screw body is reduced relative to the incident speed Q 2 ;

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

[0088] The degree of reduction M of the absolute maximum acceleration shock response spectrum peak after taking shock reduction measures relative to that without taking shock reduction measures is taken as the main shock reduction evaluation result, and the degree of reduction of the separation screw body rebound velocity relative to the incident velocity is taken as the auxiliary shock reduction evaluation result.

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

[0090] 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 the separation impact sensor 4 from the impact source consistent;

[0091] Embodiment:

[0092] like Figure 1 Capture buffer device test platform structure diagram and Figure 2 As shown in the side view of the capture buffer device test platform, a capture buffer device test platform provided by 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 transfer fixing tool 6, and a separation bolt body capture tool 7.

[0093] The upper test plate 1 is an aluminum plate with a thickness of 10-20 mm. The lower test plate 2 is an aluminum plate with a thickness of 10-20 mm. The thickness can be adjusted according to actual conditions. The transfer fixing tool 6 is made of steel with a thickness of 10-20 mm. The separation bolt body capture tool 7 is made of steel with a wall thickness of 5-10 mm.

[0094] The upper test plate 1 is fixed to the transfer fixing tool 6 by bolts through four through holes. A Φ25 through hole is opened in the center of the upper test plate 1 and the lower test plate 2. The explosive bolts pass through the Φ25 through holes in the center of the lower test plate 2 and the upper test plate 1 for fixing. The capture buffer device 8 is fixed to the upper test plate 1 by four Φ9 through holes. The separation bolt body capture tool 7 is fixed on the lower test plate 2 through four Φ6.5 through holes to prevent the high-speed separation bolt body from moving randomly when the explosive bolt is in action, thereby injuring the test personnel or damaging the test equipment. A Φ30 through hole is provided in the center of the separation bolt body capture tool 7 for connecting the explosive bolt ignition control cable with the explosive bolt 9. The first separation impact sensor 3 is fixed on the upper end surface of the upper test plate 1 through a threaded hole to collect the impact response of the separation screw body on the explosive bolt mounting surface. The second separation impact sensor 4 is fixed on the side wall of the upper test plate 1 through a threaded hole to collect the impact response of the separation screw body on the instrument mounting surface. The optical signal transmitter and the optical signal receiver 5 are fixed on the external special tool 10 through the threaded hole and do not contact the test platform to avoid affecting the photoelectric target. A small hole for the optical path of the photoelectric target sensor to pass through is provided on the capture buffer device. By reasonably setting the small hole for the optical path of the photoelectric target sensor to pass through and the positions of the optical signal transmitter and the optical signal receiver 5, the incident speed and rebound speed of the separation screw body are collected.

[0095] The through holes in 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 in the center of the upper test plate 1 and the lower test plate 2, the impact reduction performance test of the capture buffer device 8 with different installation interfaces can be realized. Among them, the thickness of the lower test plate 2 can also be changed according to actual usage.

[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 tool 7 is fixed to the lower test plate 2 by screws.

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

[0098] The impact reduction evaluation test method for capturing and buffering devices of the present invention specifically comprises the following steps:

[0099] 1) Installation of the transfer fixing tool 6: Fix it on the horizontal ground through 4 screws through the 4 through holes at the bottom of the transfer fixing tool 6. After the installation is completed, ensure that the fixing platform of the transfer fixing tool 6 remains horizontal;

[0100] 2) Installation of the upper test board 1: Use 4 bolts to pass through the upper test board 1 and the 4 through holes of the transfer fixture 6 and use nuts to fix them. After the installation is completed, it is necessary to ensure that the installation surface of the upper test board 1 to be tested is kept horizontal; the upper test board 1 is as follows Figure 3 As shown, the lower test board is Figure 4 As shown,

[0101] 3) Installation of the explosive bolt 9: The explosive bolt 9 is fixed by passing through the center holes of the lower test plate 2 and the upper test plate 1 in sequence, ensuring that the center holes of the lower test plate 2 and the upper test plate 1 are coaxial, and applying a prescribed torque value, which is consistent with the actual installation torque value on the arrow;

[0102] 4) Installation of the capture buffer device 8: fix the capture buffer device on the upper test plate 1 by 4 screws;

[0103] 5) Installation of the separation bolt body capture tool 7: Pass the explosive bolt ignition control cable through the center hole of the separation bolt body capture tool 7, and then fix the separation bolt body capture tool 7 on the lower test plate 2 by 4 screws;

[0104] 6) Installation of the separation impact sensor 3 and the separation impact sensor 4: fix the separation impact sensor 3 and the separation impact sensor 4 on the upper test plate 1 by screws. When comparing the impact reduction performance of different capture buffer devices, the relative positions of the separation impact sensor 3 and the separation impact sensor 4 from the impact source need to be kept consistent;

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

[0106] 8) After all the above operations are completed, the explosive bolt is ignited, and the impact reduction performance of the capture buffer device is comprehensively evaluated by the impact response values ​​collected by the separation impact sensor 3 and the separation impact sensor 4 and the degree to which the rebound speed of the separation screw body is reduced relative to the incident speed;

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

[0108] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A test platform suitable for evaluating the impact reduction of a capture buffer device, characterized in that: It comprises an upper test plate (1), a lower test plate (2), a first separation impact sensor (3), a second separation impact sensor (4), and a transfer fixing tool (6); The transfer fixing tool (6) is used to be fixed on a horizontal ground; The upper test plate (1) is L-shaped, comprising a vertical plate and a horizontal plate, and the vertical plate is connected and fixed to the transfer fixing tool (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 central parts of the horizontal plate of the upper test plate (1) and the lower test plate (2) are provided with through holes of the same size and coaxial, for the explosive bolts to pass through and be fixed therethrough; the horizontal plate of the upper test plate (1) is used to install a capture buffer device (8); after the explosive bolt explodes, the separation screw body and the separation bolt body are separated, and the separation screw body is captured by the capture buffer device (8); The upper test plate (1), the lower test plate (2), and the transfer fixture (6) are equivalent to simulating the installation structure and boundaries on the arrow, ensuring that the impact transmission path generated is consistent with the real 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 installation 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 on the instrument installation surface after the explosive bolt is working.

2. A test platform suitable for evaluating the impact reduction of a capture buffer device according to claim 1, characterized in that: It also includes a separation bolt body capturing tool (7), which is fixed on the lower test plate (2) and accommodates the separation bolt body to prevent the high-speed separation bolt body from moving randomly when the explosive bolt is in action.

3. A test platform suitable for evaluating the impact reduction of a capture buffer device according to claim 1, characterized in that: It also includes a speed measuring device for collecting the incident speed and rebound speed of the separation screw body.

4. A test platform suitable for evaluating the impact reduction of a capture buffer device according to claim 3, characterized in that: 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 time synchronization 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 an ignition signal, the acquisition system starts timing, and the first separation impact sensor (3), the second separation impact sensor (4) and the optical signal receiver (5) start data acquisition at the same time, so as to realize the synchronous acquisition of the impact response generated on the explosive bolt installation surface after the separation screw body is captured by the capture buffer device (8), the impact response generated on the instrument installation surface, and the incident speed and rebound speed of the separation screw body.

5. A test method for evaluating the impact reduction of a capture buffer device based on the test platform of claim 1, characterized in that The steps include: S1. Build the test platform described in claim 3; S2, installing and fixing the explosive bolts in the horizontal plate of the upper test plate (1) and the central through hole of the lower test plate (2); S3, igniting the explosive bolt, collecting the impact response of the explosive bolt installation surface and the instrument installation surface when no impact reduction measures are taken through the first separation impact sensor (3) and the second separation impact sensor (4), and collecting the incident speed and rebound speed of the separation screw body; the impact response is a time domain acceleration spectrum; S4, installing and fixing the explosive bolts on the horizontal plate of the upper test plate (1) and the central through hole of the lower test plate (2), and then installing the capture buffer device (8) on the horizontal plate of the upper test plate (1) to protect the explosive bolts; S5, igniting the explosive bolt, collecting 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), and collecting the incident speed and rebound speed of the separation screw body; S6, converting the time domain acceleration spectra acquired twice in step S3 and step S5 into an absolute maximum acceleration shock response spectrum, calculating within the response frequency domain of the instrument and equipment, the absolute reduction degree of the peak value of the maximum acceleration shock response spectrum after the shock reduction measures are taken relative to the peak value before the shock reduction measures are taken, and the reduction degree of the rebound velocity of the separation screw body relative to the incident velocity; S7. Evaluate the shock reduction performance of the capture buffer device (8) based on the degree of reduction in the peak value of the absolute maximum acceleration shock response spectrum after the shock reduction measures relative to before the shock reduction measures, and the degree of reduction in the rebound speed of the separation screw body relative to the incident speed.

6. A test method for evaluating the impact reduction of a capture buffer device based on the test platform of claim 1, characterized in that: By improving the recursive digital filtering algorithm, the time domain acceleration spectrum obtained by testing the first separation impact sensor (3) and the second separation impact sensor (4) is converted into an absolute maximum acceleration impact response spectrum.

7. A test method for evaluating the impact reduction of a capture buffer device based on the test platform of claim 1, characterized in that: The degree of reduction M of the peak value of the absolute maximum acceleration shock response spectrum after the shock reduction measures relative to before the shock reduction measures is: Where, Max(SRS a (f)) is the absolute maximum acceleration shock response spectrum peak before taking shock reduction measures, Max(SRS b (f)) is the peak value of the absolute maximum acceleration shock response spectrum after taking shock reduction measures.

8. A test method for evaluating the impact reduction of a capture buffer device based on the test platform of claim 1, characterized in that: The degree of reduction of the rebound speed of the separation screw body relative to the incident speed Q is: Among them, V a is the incident speed of the separation screw body, V b It is the rebound speed of the separation screw body.

9. A test method for evaluating the impact reduction of a capture buffer device based on the test platform of claim 1, characterized in that: The greater the reduction degree M of the absolute maximum acceleration shock spectrum peak after the shock reduction measures relative to before and after the shock reduction measures, the better.

10. A test method for evaluating the impact reduction of a capture buffer device based on claim 5, characterized in that: Applicable to the impact reduction performance evaluation of different capture buffer devices of the same instrument and equipment, the steps include: S11, using the method of claim 5 to obtain the degree of reduction M1 of the peak value of the absolute maximum acceleration impact response spectrum of the first capture buffer device after the impact reduction measure relative to before the impact reduction measure, and the degree Q1 of the reduction of the rebound speed of the separation screw body relative to the incident speed; S12, using the method of claim 5 to obtain the degree of reduction M2 of the peak value of the absolute maximum acceleration impact response spectrum of the second capture buffer device after the impact reduction measure relative to before the impact reduction measure, and the degree Q2 of the reduction of the rebound speed of the separation screw body relative to the incident speed; S13. When the degree of reduction M of the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures relative to that before the impact reduction measures is different, the greater the degree of reduction M of the peak value of the absolute maximum acceleration impact response spectrum after the impact reduction measures relative to that before the impact reduction measures, the better the impact reduction performance of the corresponding capture buffer device. When the reduction degree M of the absolute maximum acceleration shock response spectrum peak after the shock reduction measures is the same as that before and after the shock reduction measures, the greater the reduction degree Q of the rebound velocity of the separation screw body relative to the incident velocity, the better the shock reduction performance of the corresponding capture buffer device.

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