Vehicle bottom deck transient deformation test device

Abstract

The present invention provides a vehicle bottom deck transient deformation test device, comprising: a base, the top surface of the base is arranged on the top deck of the vehicle through a bracket; a crush element, the first end of the crush element is arranged on the bottom deck of the vehicle, and the second end of the crush element is arranged on the bottom surface of the base; a detection unit, arranged on the vehicle, comprising a first detection component for detecting the deformation of the crush element, a second detection component for detecting the displacement of the base, and a third detection component for detecting the displacement of the top deck; a main control unit, after responding to a blasting signal, receives the deformation of the crush element, the displacement of the base, and the displacement of the top deck sent by the detection unit, and obtains the transient deformation of the bottom deck under the blasting impact according to the deformation of the crush element, the displacement of the base, and the displacement of the top deck. The scheme of the present invention revises the displacement detected by the crush element according to the displacement of the base and the displacement of the top deck, and the obtained transient deformation of the bottom deck is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of explosion impact testing, and in particular to a device for testing the transient deformation of a vehicle bottom deck. Background Art

[0002] When a vehicle is driving in an area where mines or explosives are buried, once the mines or explosives are triggered, an explosion will occur, and the bottom of the vehicle will be suddenly impacted by the explosion. The transient deformation of the vehicle body will cause serious harm to the people inside the vehicle, so the transient deformation of the vehicle body is an important parameter for vehicle design requirements for safety performance. Since the bottom deck of the vehicle is the part that is most directly impacted, accurately measuring the transient deformation of the bottom deck of the vehicle during the explosion impact is an important reference factor for vehicle explosion-proof design.

[0003] When a vehicle is impacted by an explosion, the deformation of the bottom deck is a dynamic process, and the deformation of the bottom deck includes two parts: elastic deformation and plastic deformation. At present, the common method for detecting the deformation of the bottom deck is to directly measure the final deformation of the bottom deck after the explosion test and use it as the test result. However, the final deformation of the bottom deck after the test is plastic deformation, which cannot reflect the actual deformation of the bottom deck during the explosion. Using this as a reference factor for the explosion-proof design of vehicles may lead to certain safety hazards in the designed vehicles. Summary of the invention

[0004] The embodiment of the present invention aims to provide a vehicle bottom deck transient deformation test device to solve the technical problem of low accuracy of the test results of the bottom deck transient deformation under blasting conditions in the prior art.

[0005] To this end, some embodiments of the present invention provide a vehicle bottom deck transient deformation test device, comprising:

[0006] A base, the top surface of which is arranged on the top deck of the vehicle through a bracket;

[0007] A crush element, wherein a first end of the crush element is disposed on a bottom deck of the vehicle, and a second end of the crush element is disposed on a bottom surface of the base;

[0008] a detection unit, arranged on the vehicle, comprising a first detection component for detecting a deformation amount of the collapse element, a second detection component for detecting a displacement amount of the base seat, and a third detection component for detecting a displacement amount of the top deck;

[0009] The main control unit, in response to the blasting signal, receives the crush element deformation, the base displacement and the top deck displacement sent by the detection unit, and obtains the transient deformation of the bottom deck under the blasting impact according to the crush element deformation, the base displacement and the top deck displacement.

[0010] Optionally, in the above-mentioned vehicle bottom deck transient deformation test device, the main control unit is used to obtain the transient deformation according to the following formula:

[0011] Transient deformation = A × deformation of the collapse element + B × displacement of the base seat + C × displacement of the top deck;

[0012] Among them, A, B and C are adjustment coefficients.

[0013] Optionally, in the above-mentioned vehicle bottom deck transient deformation test device, the first detection component includes a camera, and the camera is arranged on the side deck or the rear deck of the vehicle;

[0014] The shooting area of ​​the camera includes the area where the crush element is located, and the camera shoots and records the video of the deformation process of the crush element caused by the deformation of the bottom deck;

[0015] The first detection component obtains the deformation amount of the crush element according to the initial height and the final height of the crush element recorded in the video.

[0016] Optionally, in the above-mentioned vehicle bottom deck transient deformation test device, the first detection component further includes:

[0017] A force sensor is disposed between the second end of the crush element and the bottom surface of the base, and detects the impact force applied to the crush element when the bottom deck is deformed and the duration of the impact force.

[0018] Optionally, in the above-mentioned vehicle bottom deck transient deformation test device, the starting point of the impact duration is taken as time T1, and the end point of the impact duration is taken as time T2; the first detection unit is also used to obtain the initial pixel area of ​​the crush element in the video image at time T1; obtain the final pixel area of ​​the crush element in the video image at time T2; obtain the video image revision ratio according to the final pixel area, the initial pixel area and the impact duration; obtain the corresponding relationship between the deformation of the crush element and time according to the video image revision ratio, the initial height and the final height of the crush element; and send the corresponding relationship to the main control unit.

[0019] Optionally, in the above-mentioned vehicle bottom deck transient deformation testing device, the first detection unit is also used to obtain the impact impulse of the bottom deck on the crush element according to the impact force and the impact force duration detected by the force sensor and the integral operation result of the impact force over time, and the first detection unit sends the impact impulse to the main control unit.

[0020] Optionally, in the above-mentioned vehicle bottom deck transient deformation testing device, the second detection component includes a laser vibrometer arranged on the top deck of the vehicle, and the base is located on the laser transmission path of the laser vibrometer; the laser vibrometer emits a laser beam to the top surface of the base, receives the laser beam reflected by the top surface of the base, and obtains the displacement of the base relative to the top deck as the base displacement according to the laser beam emission time and reception time.

[0021] Optionally, in the above-mentioned vehicle bottom deck transient deformation testing device, the third detection component includes an acceleration sensor arranged on the top deck of the vehicle, and the acceleration sensor detects the acceleration of the top deck, and obtains the displacement of the top deck after integrating the acceleration.

[0022] Optionally, the above-mentioned vehicle bottom deck transient deformation test device further includes:

[0023] A simulated blasting assembly is arranged below the bottom deck and simulates an explosion scene after receiving a blasting start signal;

[0024] The main control unit uses the blasting start signal as the blasting signal.

[0025] Optionally, in the above-mentioned vehicle bottom deck transient deformation testing device, the main control unit synchronizes the clocks of the first detection component, the second detection component and the third detection component at set time intervals.

[0026] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0027] The vehicle bottom deck transient deformation testing device provided by the present invention, in response to the blasting signal, that is, the explosion occurs, the bottom deck will deform upward to squeeze the crush element to deform, the deformation of the crush element is measured by the first detection component to obtain the maximum transient deformation of the bottom deck, the base displacement is monitored by the second detection component arranged in the vehicle, and the top deck displacement is detected by the third detection component, which is equivalent to obtaining the displacement of the entire vehicle during the explosion. The displacement detected by the crush element is revised according to the base displacement and the top deck displacement, and the obtained transient deformation of the bottom deck is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] Figure 1 This is a schematic diagram of the arrangement of a vehicle bottom deck transient deformation test device according to an embodiment of the present invention on an armored vehicle;

[0030] Figure 2 This is a schematic diagram of the arrangement of a vehicle bottom deck transient deformation test device according to another embodiment of the present invention on an armored vehicle;

[0031] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of the accompanying drawings;

[0032] Figure 4 A schematic diagram of a signal transmission method of a vehicle bottom deck transient deformation test device according to an embodiment of the present invention;

[0033] Figure 5a-5c The figure is a schematic diagram of pictures captured by a camera at different times according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the simplified description of the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In some embodiments of the present invention, a vehicle bottom deck transient deformation test device is provided, which is arranged in the body 100 of an armored vehicle, such as Figures 1 to 4As shown, it includes a base 201, a bracket 202, a crush element 203, and a detection unit, and the detection unit includes a first detection component 204, a second detection component 205, and a third detection component 206. The top surface of the base 201 is set on the top deck 102 of the vehicle through the bracket 202; the first end of the crush element 203 is set on the bottom deck 101 of the vehicle, and the second end of the crush element 203 is set on the bottom surface of the base 201; the detection unit is set on the vehicle, the first detection component 204 is used to detect the deformation of the crush element, the second detection component 205 is used to detect the displacement of the base, and the third detection component 206 is used to detect the displacement of the top deck. The main control unit 207, after responding to the blasting signal, receives the deformation of the crush element, the displacement of the base, and the displacement of the top deck sent by the detection unit, and obtains the transient deformation of the bottom deck under the blasting impact according to the deformation of the crush element, the displacement of the base, and the displacement of the top deck.

[0037] After the explosion, the whole vehicle will move upward under the impact of the explosion, and the above test device will move upward with the whole vehicle. Therefore, the deformation of the crush element is not the actual deformation of the bottom deck, which needs to be further corrected. However, through this solution, the bottom deck 101 will deform upward to squeeze the crush element 203 to deform. The deformation of the crush element 203 can be measured by the first detection component 204 to obtain the maximum transient deformation of the bottom deck 101. The displacement of the base 201 is detected by the second detection component 205 set in the vehicle, and the displacement of the top deck 102 is detected by the third detection component 206, which is equivalent to obtaining the displacement of the whole vehicle during the explosion. The displacement detected by the crush element is revised according to the displacement of the base and the displacement of the top deck, and the transient deformation of the bottom deck obtained is more accurate.

[0038] Preferably, the second detection component 205 includes a laser vibrometer 2051 disposed on the top deck 102 of the vehicle, and the base 201 is located on the laser transmission path of the laser vibrometer 2051; the laser vibrometer 2051 emits a laser beam to the top surface of the base 201, receives the laser beam reflected by the top surface of the base 201, and obtains the displacement of the base 201 relative to the top deck 102 as the base displacement according to the laser beam emission time and reception time. The laser vibrometer 2051 disposed on the top deck 102 can be used to revise the displacement error of the base 201 relative to the top deck 102. Since the deformation of the base 201 during the explosion process is small, using the laser vibrometer 2051 to test the displacement can obtain more accurate results.

[0039] Furthermore, the third detection component 206 includes an acceleration sensor 2061 disposed on the top deck 102 of the vehicle, and the acceleration sensor 2061 detects the acceleration of the top deck 102, and obtains the displacement of the top deck after integrating the acceleration. The measurement data of the acceleration sensor 2061 disposed on the top deck 102 can directly obtain the displacement of the top deck by integrating, which simplifies the calculation process and facilitates the correction of the vehicle body motion displacement error.

[0040] In addition, the test device shown in the figure is installed in the armored vehicle, and its installation position is preferably directly above the blasting point, where the deformation of the bottom deck 101 is the largest. If it is necessary to measure the deformation at multiple positions, multiple sets of test devices can be set at different positions in the armored vehicle according to needs.

[0041] In the above scheme, the main control unit 204 is used to obtain the transient deformation according to the following formula: transient deformation = A × collapse element deformation + B × base displacement + C × top deck displacement; wherein A, B and C are adjustment coefficients, and the preferred values ​​of A, B and C are all 1, which can be specifically calibrated according to actual conditions. In addition, in the above formula, the vertical upward direction is set as the positive direction. When measuring the base displacement and the top deck displacement, the upward direction is taken as positive and the downward direction is taken as negative.

[0042] In the above scheme, the first detection component 204 includes a camera 2042, and the camera 2042 is arranged on the side deck or the rear deck 103 of the vehicle. The shooting area of ​​the camera 2042 includes the area where the crush element 203 is located, and the camera 2042 shoots and records the video of the deformation process of the crush element 203 caused by the deformation of the bottom deck; the first detection component 204 obtains the deformation amount of the crush element according to the initial height and final height of the crush element 203 recorded in the video. The camera 2042 selects a high-speed camera, which can capture moving images with an exposure of less than 1 / 1000 second or a frame rate of more than 250 frames per second. Therefore, it can accurately record the entire process of the deformation of the crush element 203. Since the collapse element 203 (such as a collapse type ruler tube) can record the maximum deformation of the bottom deck 101, but cannot restore the crushing process or reflect the deformation process of the bottom deck, the deformation process of the bottom deck can be obtained by recording the deformation process of the collapse element with a high-speed camera, which can provide reference data for vehicle design.

[0043] Furthermore, the first detection component 204 may also include a force sensor 2041, which is disposed between the second end of the crush element and the bottom surface of the base 201, and detects the impact force applied to the crush element 203 and the duration of the impact force when the bottom deck is deformed. Assuming that the detection result of the force sensor 2041 is zero when the crush element 203 is not subjected to the impact force, the moment when the detection result of the force sensor 2041 is greater than zero is taken as the starting point of the duration of the impact force, and when the deformation of the bottom deck is completed, the impact force received by the crush element 203 becomes zero, and the moment when the detection result of the force sensor 2041 returns to zero is taken as the end point of the duration of the impact force. The deformation process of the bottom deck has been recorded by a high-speed camera, and combined with the impact force generated when the bottom deck is deformed, the impact resistance of the bottom deck 101 during the explosion process can be better determined.

[0044] Since the camera 2042 is fixed on the side deck or the rear deck 103, when the explosion occurs, the movement of the vehicle body will affect the clarity of the image captured by the camera, causing the length scale in the image captured by the camera 2042 to be distorted, thereby causing a large measurement error. In order to solve this problem, preferably, the vehicle bottom deck transient deformation test device in the above scheme takes the starting point of the impact duration as the T1 moment, and the end point of the impact duration as the T2 moment. The first detection unit 204 is also used to obtain the initial pixel area of ​​the crush element in the video image at the T1 moment; obtain the final pixel area of ​​the crush element in the video image at the T2 moment; obtain the video image revision ratio according to the final pixel area, the initial pixel area and the impact duration; obtain the corresponding relationship between the crush element deformation and time according to the video image revision ratio, the initial height and the final height of the crush element; and send the corresponding relationship to the main control unit.

[0045] refer to Figure 5a-5c, assuming that P1 is the video image at time T1, the number of rows of pixels occupied by the crush element or the height of the crush element can be determined from the figure as M1; assuming that P2 is the video image at time T2, at this time, the bottom deck has been deformed, and the crush element must also be deformed due to the impact force. From the figure, the number of rows of pixels occupied by the crush element or the height of the crush element is determined as M2; and for any frame image Px in the video, the number of rows of pixels occupied by the crush element or the height of the crush element is Mx; when each frame image or multiple frames in the video are compared, the impact on the camera image scale can be determined and then revised. If the image scale in each frame image has been determined, and the pixel area occupied by the crush element in the image is also determined, the actual height of the crush element corresponding to the moment of shooting the frame image can be determined. In this solution, by revising the image distortion error caused by the blasting environment of the camera, it can be ensured that the deformation process of the crush element 203 or the bottom deck 101 recorded in the end has a higher accuracy.

[0046] Preferably, the first detection unit 204 is further used to obtain the impact impulse of the bottom deck 101 on the crush element 203 according to the impact force and the impact force duration detected by the force sensor 2041 and the integration result of the impact force over time, and the first detection unit 204 sends the impact impulse to the main control unit 207. Therefore, in addition to assisting in correcting the shooting error of the camera, the force sensor 2041 is also used to assist in recording the impact impulse of the bottom deck on the crush element, which is an important reference for the design of the vehicle bottom protection component.

[0047] Furthermore, the above vehicle bottom deck transient deformation test device may also include a simulated blasting component 208, which is arranged below the bottom deck 101, and simulates an explosion scene after receiving the blasting start signal; the main control unit 207 uses the blasting start signal as the blasting signal. In actual application, the simulated blasting component 208 can be controlled by the main control unit 207, or by a separate control unit. If the simulated blasting component 208 is controlled by the main control unit 207, the main control unit 207 sends a blasting start signal. If the simulated blasting component 208 has a separate control unit, the main control unit 207 and the control unit of the simulated blasting component 208 can realize data communication, and the control unit of the simulated blasting component 208 sends a blasting start signal, and at the same time sends the same signal to the main control unit 207, and the main control unit 207 can respond immediately to the information that the explosion has been started. As mentioned above, it is preferred that the simulated blasting component 208 is arranged directly below the collapse element 203.

[0048] Furthermore, the main control unit 207 synchronizes the clocks of the first detection component 204, the second detection component 205 and the third detection component 206 at set intervals. By synchronizing the clocks of the various detection components, it is ensured that the data detected by each detection component is the real state at the same time, thereby improving the accuracy of the bottom deck transient deformation detection result. In addition, the above detection components are preferably all started before the simulated blasting assembly 208 is detonated to ensure that the test device can instantly detect the key data parameters at all times of the explosion process.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle bottom deck transient deformation test device, characterized in that: include: A base, the top surface of which is arranged on the top deck of the vehicle through a bracket; A crush element, wherein a first end of the crush element is disposed on a bottom deck of the vehicle, and a second end of the crush element is disposed on a bottom surface of the base; a detection unit, arranged on the vehicle, comprising a first detection component for detecting a deformation amount of the collapse element, a second detection component for detecting a displacement amount of the base seat, and a third detection component for detecting a displacement amount of the top deck; The main control unit, in response to the blasting signal, receives the crush element deformation, the base displacement and the top deck displacement sent by the detection unit, and obtains the transient deformation of the bottom deck under the blasting impact according to the crush element deformation, the base displacement and the top deck displacement.

2. The vehicle bottom deck transient deformation test device according to claim 1, characterized in that: The main control unit is used to obtain the transient deformation according to the following formula: Transient deformation = A × deformation of the collapse element + B × displacement of the base seat + C × displacement of the top deck; Among them, A, B and C are adjustment coefficients.

3. The vehicle bottom deck transient deformation test device according to claim 1, characterized in that: The first detection component includes a camera, and the camera is arranged on a side deck or a rear deck of the vehicle; The shooting area of ​​the camera includes the area where the crush element is located, and the camera shoots and records the video of the deformation process of the crush element caused by the deformation of the bottom deck; The first detection component obtains the deformation amount of the crush element according to the initial height and the final height of the crush element recorded in the video.

4. The vehicle bottom deck transient deformation test device according to claim 3, characterized in that: The first detection component also includes: A force sensor is disposed between the second end of the crush element and the bottom surface of the base, and detects the impact force applied to the crush element when the bottom deck is deformed and the duration of the impact force.

5. The vehicle bottom deck transient deformation test device according to claim 4, characterized in that: The starting point of the impact duration is taken as time T1, and the ending point of the impact duration is taken as time T2; the first detection unit is also used to obtain the initial pixel area of ​​the collapse element in the video image at time T1; Acquire a final pixel area of ​​the crush element in the video image at time T2; A video image revision ratio is obtained according to the final pixel area, the initial pixel area and the impact duration; a corresponding relationship between the deformation amount of the crush element and time is obtained according to the video image revision ratio, the initial height and the final height of the crush element; and the corresponding relationship is sent to the main control unit.

6. The vehicle bottom deck transient deformation testing device according to claim 5, characterized in that: The first detection unit is also used to obtain an impact impulse of the bottom deck on the crush element according to the impact force and the impact duration detected by the force sensor and the integration result of the impact force over time, and the first detection unit sends the impact impulse to the main control unit.

7. The vehicle bottom deck transient deformation testing device according to any one of claims 1 to 6, characterized in that: The second detection component includes a laser vibrometer arranged on the top deck of the vehicle, and the base is located on the laser transmission path of the laser vibrometer; the laser vibrometer emits a laser beam to the top surface of the base, receives the laser beam reflected by the top surface of the base, and obtains the displacement of the base relative to the top deck as the base displacement according to the emission time and the reception time of the laser beam.

8. The vehicle bottom deck transient deformation testing device according to any one of claims 1 to 6, characterized in that: The third detection component includes an acceleration sensor disposed on a top deck of the vehicle, wherein the acceleration sensor detects the acceleration of the top deck and obtains the displacement of the top deck by integrating the acceleration.

9. The vehicle bottom deck transient deformation testing device according to any one of claims 1 to 6, characterized in that: Also includes: A simulated blasting assembly is arranged below the bottom deck and simulates an explosion scene after receiving a blasting start signal; The main control unit uses the blasting start signal as the blasting signal.

10. The vehicle bottom deck transient deformation testing device according to claim 9, characterized in that: The main control unit synchronizes the clocks of the first detection component, the second detection component and the third detection component at set time intervals.

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