A device for measuring dynamic deformation under explosion impact

Abstract

The present invention is a device for dynamic deformation measurement under explosion impact. It includes a deformation measurement comb, a data collector and a signal monitoring terminal. The deformation measurement comb includes a mounting block, a signal acquisition box and a signal rod. The signal acquisition box has a built-in signal board, and a signal probe is installed on the top of the signal rod. When the explosion impact is transmitted to the bottom deck and causes deformation, the bottom deck hits the signal rod with a gradient change. The signal rod carries the signal probe and moves vertically to cause the signal board to generate an electrical signal. The signal of the hit signal rod is collected by the data collector, and the data is analyzed and processed and sent to the signal monitoring terminal for visualization operation, thereby obtaining the local dynamic deformation data of the bottom deck and measuring the maximum deformation of the bottom deck. The overall mounting frame and the support rod structure of the present invention are designed to be close to rigidity, so as to avoid severe deformation of the measuring device due to impact; while ensuring the credibility of the measurement data, the measuring device body can also be reused.

Description

Technical Field

[0001] The invention belongs to the field of testing, and in particular relates to a device for measuring dynamic deformation under explosion impact. Background Art

[0002] In recent years, threats to the safety of military vehicles on the battlefield have increased significantly, with mines and improvised explosive devices (IEDs) becoming the primary threats. Ensuring the survivability of military vehicles and their crews in explosive environments is a pressing issue. Currently, the primary approach involves installing anti-mine components under the vehicle to mitigate damage to the vehicle and its crew. Full-vehicle explosion tests are also conducted to verify the blast resistance of component materials and structures. Among the dynamic response indicators of structures subjected to explosive shock, the maximum deformation of the vehicle's local underdeck is a key consideration.

[0003] Traditional dynamic deformation measurement devices often use strain combs, which feature a back and teeth with a gradient length. Upon impact with the specimen, the comb undergoes plastic deformation, which is then used to measure the specimen's maximum deformation. However, these devices lack real-time data on the structure's dynamic deformation and require manual measurement, which can introduce unnecessary human error and prevent reuse. Traditional strain combs typically require an additional measurement system to complete measurements, making them difficult to install and measure independently. Summary of the Invention

[0004] The object of the present invention is to provide a device for measuring dynamic deformation under explosion impact.

[0005] The technical solution to achieve the purpose of the present invention is: a device for measuring dynamic deformation under explosion impact, used to measure the dynamic deformation of the vehicle bottom deck, the device is fixedly installed on the upper side of the bottom deck to be tested; the device includes a vehicle body connector, a signal rod, a signal probe, a signal board, a mounting frame and a data acquisition system;

[0006] The vehicle body connector connects the mounting frame to the corresponding part of the vehicle body. The signal board is evenly spaced with metal films. The vertical force threshold that the metal film can withstand is 45-55N. The mounting frame is provided with multiple through holes corresponding to the metal films and arranged on both sides of the metal films. The signal probe is arranged at the upper end of the signal rod. The lengths of the multiple signal rods are determined according to needs. When testing, the multiple signal probes are respectively located in the through holes on the lower side of the metal film; after the signal rod is hit by the bottom deck, it drives the signal probe to move upward, and the tip of the signal probe pierces the metal film and enters the through hole on the upper side of the metal film. The signal board generates an electrical signal, and the data acquisition system collects the electrical signal and performs analysis and calculation.

[0007] Further, the vehicle body connector includes a vehicle body connector, a supporting link and a mounting block;

[0008] The vehicle body connector is used for installation with the vehicle body. After the position to be tested is selected, the vehicle body connector is fixed to the vehicle body by welding. The supporting link is located below the vehicle body connector, and the top and bottom are connected to the vehicle body connection mechanism and the mounting block respectively with bolts.

[0009] Furthermore, the mounting frame includes a guide support plate and a mounting top plate;

[0010] The signal plate is arranged between the guide support plate and the mounting top plate. The two sides of the three plates are connected by bolts. The upper end of the mounting top plate is connected to the mounting block. The guide support plate is provided with a stepped hole for installing and placing the signal probe, and the mounting top plate is provided with a through hole for the signal probe to pass through.

[0011] The signal probe and the signal rod are detachably connected, and a disc with a diameter larger than that of the signal rod is provided at the connection. The disc is clamped at the step of the stepped hole, and the size of the metal film of the signal plate is smaller than that of the disc.

[0012] Furthermore, the signal probe is threadedly connected to the signal rod, and the end of the signal probe is in the shape of a truncated cone with a smaller diameter at the top and a larger diameter at the bottom.

[0013] Furthermore, the signal pole is made of high-strength steel with a yield strength of 1000 MPa ± 100 MPa.

[0014] Furthermore, the thickness of the signal board body is 2-3mm, and the thickness of the metal film is 0.6-0.8mm; there are several circuits and matching detection modules inside the signal board, and the circuits are connected through the metal film. Each metal film is located in an independent circuit. When the metal film is damaged, the circuit is broken and the detection module immediately generates a pulse signal.

[0015] Furthermore, the supporting connecting rod is made of high-strength steel and has a rod-shaped structure; the guide support plate and the mounting top plate are made of steel.

[0016] Furthermore, the data acquisition system includes a data collector and a signal monitoring terminal.

[0017] The data collector contains a signal processing circuit and an A / D sampling circuit. After the electric pulse signal is filtered, amplified, and conditioned, it is converted into a digital signal by the A / D sampling circuit. The data collector has a data storage unit and has data storage function.

[0018] Furthermore, the lengths of the signal rods are arranged in a gradient manner.

[0019] A method for dynamic deformation measurement using the above device comprises the following steps:

[0020] The shock wave reaches the bottom of the vehicle within milliseconds. After acting on the bottom deck of the vehicle, the bottom deck is deformed. After the signal rod is hit by the bottom deck, it drives the signal probe to move upward. The tip of the signal probe pierces the metal film. The detection module built into the signal board detects the interruption of the circuit and sends an electric pulse signal to the data collector. After signal analysis and processing, the data is transmitted to the signal monitoring terminal far away from the explosion source to obtain the local dynamic deformation data of the bottom deck and realize the measurement of the maximum deformation of the bottom deck.

[0021] Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) The signal rods of the present invention are arranged in a gradient of length. When the explosion impact is transmitted to the bottom deck and causes deformation, the bottom deck sequentially impacts the signal rods with gradient changes. The existence of the signal rod length gradient causes the signal rod electrical signals to be generated and transmitted in a time sequence according to the decreasing length of the signal rods. The data collector collects the signals in real time, further obtains the local dynamic deformation data of the floor, and realizes the measurement of the maximum deformation of the floor. At the same time, simply changing the length of the signal rod can change the gradient change pattern of the signal rod to obtain multiple sets of dynamic deformation data, which is conducive to a more complete study of the dynamic response process of the structure in a time sequence.

[0023] (2) The signal rod and the guide hole of the present invention correspond to each other, ensuring that the signal rod moves along the preset direction after being hit, and the pressure rod is preferably made of high-strength steel, which is not easy to bend or crush and deform, so that the signal board can accurately collect signals.

[0024] (3) The replaceable signal probe of the present invention is fixed to the guide support plate through a clearance fit. When the signal rod carries the signal probe at the top and moves vertically, the metal film of the signal plate is damaged due to pressure. The built-in detection module of the signal plate detects the interruption of the circuit and sends an electric pulse signal to the data collector. After signal processing, the electric pulse signal is sent to the signal monitoring terminal far away from the explosion source, ensuring that the test personnel can obtain the measurement results safely and conveniently.

[0025] (4) The deformation measurement comb of the present invention can be used to fix the vehicle body connector above the bottom deck to be measured using a simple welding technique. The maximum deformation of the bottom deck during an explosion can be measured, thereby achieving the purpose of evaluating the blast resistance of research materials and structures. After the measurement is completed, except for the vehicle body connector, the remaining structure is bolted together, making it easy to disassemble and assemble.

[0026] (5) The overall mounting frame and support rod structure of the present invention are designed to be nearly rigid, thus preventing the measuring device from being severely deformed due to impact; while ensuring the credibility of the measurement data, the measuring device body can also be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is a three-dimensional schematic diagram of the deformation measurement comb of the present invention.

[0028] Figure 2 This is a partial cross-sectional view of the signal acquisition box of the present invention.

[0029] Figure 3 This is a schematic diagram of the installation of a signal probe for a state to be measured according to the present invention.

[0030] Figure 4 This is a block diagram of the implementation principle of the present invention.

[0031] Description of reference numerals:

[0032] 1-body connector, 2-support link, 3-mounting frame, 4-guide support plate, 5-signal rod, 6-mounting top plate, 7-signal probe, 8-signal board, 9-data collector, 10-signal monitoring terminal. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-4 As shown, a device for measuring the dynamic deformation of a structure under explosion impact includes a deformation measurement comb, a data collector and a signal monitoring terminal.

[0035] The deformation measurement comb comprises:

[0036] Device mounting bracket: includes top-down vehicle body connectors, support links and signal device mounting blocks to connect the test device to the vehicle body.

[0037] Signal acquisition box: includes mounting frame and signal board, which realizes signal acquisition during impact process.

[0038] Signal rod: includes a pressure rod and a signal probe, which is the impacted body and receives the impact from the bottom deck.

[0039] The vehicle body connector 1 is made of ordinary steel and is in the shape of a square block. The top is welded to the vehicle body and the bottom is connected to the supporting connecting rod by bolts.

[0040] The support link 2 is made of high-strength steel and is a rod-shaped structure. Its bottom is bolted to the signal device mounting block. The support link 2 connects the mounting point and the measurement point. Its size is designed according to the interior space dimensions of the vehicle to be measured.

[0041] The signal device mounting block 3 is made of ordinary steel and has a square block structure. The bottom is connected to the mounting frame with bolts to achieve the connection between the device mounting bracket and the mounting frame.

[0042] The mounting frame is made of high-strength steel and has a plate-like structure, including a mounting top plate 6 and a guide support plate 4. The mounting frame provides sufficient internal space to accommodate the signal board and has a certain structural strength to ensure that the signal acquisition box does not undergo severe deformation after being impacted.

[0043] The mounting top plate 6 and the guide support plate 4 are connected at both ends by bolts, and are both provided with a plurality of through holes corresponding to the signal rods, providing space for the vertical movement of the signal rods and allowing the wires to pass therethrough.

[0044] The guide support plate 4 is bolted to the signal plate 8. In the test state, the signal probe 7 passes through the mounting hole, and the bottom end disc fits with the mounting hole boss to realize the positioning of the signal probe, while ensuring that the movement direction of the signal rod 5 after being hit is always perpendicular to the signal plate 8.

[0045] The signal board 8 is equipped with a metal film corresponding to the signal probe 7. The signal board is 2-3mm thick, while the metal film is 0.6-0.8mm thick. The metal film can withstand a vertical force threshold of 50N. The left and right ends of the signal board 8 are bolted to the guide support plate. The signal board 8 contains several circuits and supporting detection modules. The circuits are connected through the metal film, and each metal film is located in an independent circuit. When the metal film is damaged, the circuit is disconnected, and the detection module generates a pulse signal.

[0046] The signal probe 7 includes an inner and outer fixing structure. The inner fixing structure is mounted on the upper end of the metal cylinder of the pressure rod 5, and the outer fixing structure is fixed to the guide support plate, with a margin between the metal film and the tip of the signal probe.

[0047] The compression rods are a set of metal cylinders made of high-strength steel with a yield strength of approximately 1000 MPa. This ensures they are rigid enough to withstand impacts from the bottom deck without bending or even breaking. The length of the compression rods varies in a gradient.

[0048] The data acquisition unit contains signal processing circuitry and an A / D sampling circuit, with a sampling frequency set at 10,000 Hz. The electrical pulse signal undergoes filtering, amplification, and conditioning, followed by A / D conversion to generate a digital signal. The collected data undergoes logical operations and other processing before being sent to the signal processing terminal. The data acquisition unit also includes a data storage unit, providing data storage capabilities. The signal monitoring terminal can visualize the data and monitor the deformation measurement comb's measurement status in real time.

[0049] Example

[0050] A device for measuring the dynamic deformation of structures subjected to explosive impacts, comprising a deformation measurement comb, a data collector, and a signal monitoring terminal. The device mounting bracket includes a vehicle body connector 1, used to mount the measuring device to the vehicle body. After the measurement location is selected, the vehicle body connector 1 is welded to the vehicle structure, securing the entire measuring device to the vehicle body. A supporting link 2, located below the vehicle body connector 1 and providing strong support stability, is bolted to the vehicle body connection mechanism 1 and a signal device mounting block 3 at both the top and bottom. The signal device mounting block 3 is used to connect the device mounting bracket system to the signal acquisition box.

[0051] The signal acquisition box includes: a mounting top plate 6 in an inverted "T" shape with a square groove at the bottom. Together with the guide support plate 4, it provides mounting space for a signal plate 8. Equidistant through-holes are provided to accommodate a signal probe 7 at the top of the signal pole after an impact. Bolt holes are provided on both sides to connect to the guide support plate 4. The guide support plate 4 also has equidistant mounting holes. When in the test state, the signal probe 7 passes through the mounting holes, and the bottom end disc fits with the mounting hole boss to achieve signal probe positioning. At the same time, it ensures that the direction of movement of the signal pole after an impact is always perpendicular to the signal plate. The two sides of the guide support plate 4 are connected to the signal plate 8 by bolts to ensure that the signal plate does not misalign after being impacted by the signal probe 7.

[0052] The signal rod includes a signal probe 7 with a threaded bottom that connects to the threaded hole at the top of the pressure rod 5. The lower end of the signal probe 7 is a thin disc that fits into the mounting hole of the guide support plate 4. When in the test state, the edge of the disc engages a raised portion at the bottom of the mounting hole. The top of the signal probe 7 is a rounded cone, ensuring sufficient pressure to break the metal film. When the signal rod is impacted by the bottom deck, the probe 7 moves upward, and the tip of the probe 7 pierces the metal film, generating an electrical signal on the signal plate 8.

[0053] After the deformation measurement comb is installed on the vehicle body, the data collector 9 is turned on and connected to the signal detection terminal 10, and the equipment enters the test state. When the mine is detonated, the shock wave reaches the bottom of the vehicle within a few milliseconds. After acting on the bottom deck of the vehicle, the bottom deck is deformed and hits the deformation measurement comb arranged in the vehicle. The signal rod carries the signal probe 7 at the top to move vertically. The metal film in the signal board is damaged due to pressure. The built-in detection module of the signal board detects the interruption of the circuit and sends an electric pulse signal to the data collector 9. After signal analysis and processing, the data is transmitted to the signal monitoring terminal 10 far away from the explosion source to obtain the local dynamic deformation data of the bottom deck and realize the measurement of the maximum deformation of the bottom deck.

Claims

1. A device for measuring dynamic deformation under explosion impact, characterized in that: The device is used to measure the dynamic deformation of the vehicle bottom deck, and is fixedly arranged on the upper side of the bottom deck to be tested; the device includes a device mounting bracket, a signal rod (5), a signal probe (7), a signal board (8), a mounting frame and a data acquisition system; The device mounting bracket connects the mounting frame to the corresponding part of the vehicle body, the signal board (8) is evenly spaced with metal films, the vertical force threshold that the metal films can withstand is 45-55N, the mounting frame is provided with a plurality of through holes corresponding to the metal films and arranged on both sides of the metal films, the signal probe (7) is arranged at the upper end of the signal rod (5), the lengths of the plurality of signal rods are determined according to needs, and when being tested, the plurality of signal probes are respectively located in the through holes on the lower side of the metal film; after the signal rod (5) is hit by the bottom deck, the signal probe (7) is driven to move upward, the tip of the signal probe (7) pierces the metal film and enters the through hole on the upper side of the metal film, the signal board (8) generates an electrical signal, and the data acquisition system collects the electrical signal and performs analysis and calculation; The mounting frame comprises a guide support plate (4) and a mounting top plate (6); The signal plate (8) is arranged between the guide support plate (4) and the mounting top plate (6), the two sides of the three plates are connected by bolts, the upper end of the mounting top plate (6) is connected to the mounting block (3), the guide support plate (4) is provided with a stepped hole for mounting and placing a signal probe, and the mounting top plate is provided with a through hole for the signal probe (7) to pass through; The signal probe (7) and the signal rod (5) are detachably connected, and a disc having a diameter larger than that of the signal rod is provided at the connection, the disc being clamped at the step of the stepped hole, and the size of the metal film of the signal plate (8) being smaller than that of the disc; The thickness of the main body of the signal board (8) is 2-3 mm, and the thickness of the metal film is 0.6-0.8 mm; a number of circuits and matching detection modules are arranged inside the signal board, and the circuits are connected through the metal film. Each metal film is located in an independent circuit. When the metal film is damaged, the circuit is disconnected, and the detection module immediately generates a pulse signal. The signal rod (5) is made of high-strength steel with a yield strength of 1000 MPa±100 MPa.

2. The device according to claim 1, characterized in that The device mounting bracket includes a vehicle body connecting piece (1), a supporting connecting rod (2) and a mounting block (3); The vehicle body connector (1) is used for installation with the vehicle body. After the position to be tested is selected, the vehicle body connector (1) is fixed to the vehicle body by welding. The supporting connecting rod (2) is located below the vehicle body connector (1), and the top and bottom are respectively connected to the vehicle body connector (1) and the mounting block (3) by bolts.

3. The device according to claim 2, characterized in that The signal probe (7) is threadedly connected to the signal rod (5), and the end of the signal probe (7) is in the shape of a truncated cone with a smaller diameter at the top and a larger diameter at the bottom.

4. The device according to claim 3, characterized in that The supporting connecting rod (2) is made of high-strength steel and has a rod-shaped structure; the guide support plate (4) and the mounting top plate (6) are made of steel.

5. The device according to claim 1, characterized in that The data acquisition system includes a data collector (9) and a signal monitoring terminal (10). The data collector contains a signal processing circuit and an A / D sampling circuit. After the electric pulse signal is filtered, amplified, and conditioned, it is converted into a digital signal by the A / D sampling circuit. The data collector has a data storage unit and has data storage function.

6. The device according to claim 1, characterized in that The lengths of the signal rods are arranged in a gradient manner.

7. A method for dynamic deformation measurement using the device according to any one of claims 1 to 6, characterized in that: The steps include: The shock wave reaches the bottom of the vehicle within a few milliseconds. After it acts on the bottom deck of the vehicle, the bottom deck is deformed. After the signal rod (5) is hit by the bottom deck, it drives the signal probe (7) to move upward. The tip of the signal probe (7) pierces the metal film. The detection module built into the signal board detects the interruption of the circuit and sends an electric pulse signal to the data collector (9). After signal analysis and processing, the data is transmitted to the signal monitoring terminal (10) far away from the explosion source to obtain the local dynamic deformation data of the bottom deck and realize the measurement of the maximum deformation of the bottom deck.

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