An inverted T-shaped shelter calibration operating condition test device

Abstract

The present application relates to the technical field of side impact honeycomb barrier development, and discloses a kind of inverted T-shaped barrier calibration operating condition test equipment, including inverted T-shaped mechanism, hoisting mechanism and force measuring wall, inverted T-shaped mechanism includes energy-absorbing unit and several rigid components, and rigid component is hung on hoisting mechanism, energy-absorbing unit includes the bottom plate and back plate that are vertically arranged in parallel, and the bottom plate and back plate are horizontally slidingly connected, the bottom plate is connected with force measuring wall, and the back plate is connected with rigid component, and rigid component is combined into inverted T shape.This equipment can simulate the non-uniform deformation form of real test vehicle impacting honeycomb aluminum barrier, and obtain the dynamic calibration test data of honeycomb aluminum close to real impact.

Description

Technical Field

[0001] This invention relates to the field of side-impact honeycomb barrier development technology, specifically to an inverted T-shaped barrier calibration test device. Background Technology

[0002] Standard side-impact cellular barrier dynamic certification tests involve a cellular barrier impacting a planar rigid force measurement element matrix perpendicularly to the front at a specific speed. The side-impact cellular aluminum barrier deforms uniformly along the collision plane. The acquired dynamic stiffness response only satisfies the uniform deformation pattern. However, standard certification calibration test conditions differ significantly from actual vehicle side-impact test conditions because the planar force measurement wall cannot simulate the non-uniform distribution of the impacted vehicle's side structure. This significantly impacts the accurate characterization of side-impact cellular barrier performance. For example, in a vehicle side-impact scenario, the collision and compression between the vehicle's side structure and the cellular barrier surface not only causes non-uniform deformation of the barrier surface but also subjects the barrier's internal structure to shear and bending loads. Therefore, current standard side-impact cellular barrier dynamic certification tests have very limited applicability in characterizing the performance of cellular aluminum barriers under real vehicle impact conditions. To address this issue, improve the mechanical performance characterization of side-impact cellular barriers, and enhance the consistency, repeatability, and reproducibility of whole-vehicle side-impact tests, a dynamic calibration device for side-impact cellular barrier performance is needed.

[0003] Compared to traditional side-impact honeycomb barrier dynamic calibration test equipment, a more realistic dynamic calibration device is needed to reflect the deformation of the honeycomb aluminum barrier under actual side-impact conditions. This device can accurately output the impact load when the honeycomb aluminum barrier impacts the T-shaped component. In order to obtain data that is closer to the actual side-impact conditions, it is also necessary to output the corresponding collision acceleration curve of the trolley and the three-dimensional point cloud data of the deformation of the honeycomb aluminum barrier after impact. Based on these data, numerical analysis is performed to develop a honeycomb aluminum barrier that is closer to the actual collision test conditions. Summary of the Invention

[0004] The present invention aims to provide a calibration test device for an inverted T-shaped barrier, which can obtain test data close to real collisions in a test method with sufficient accuracy.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an inverted T-shaped barrier calibration test device, comprising an inverted T-shaped mechanism, a hoisting mechanism, and a force measuring wall. The inverted T-shaped mechanism includes an energy-absorbing unit and several rigid components, all of which are hung on the hoisting mechanism. The energy-absorbing unit includes a bottom plate and a back plate arranged in parallel and vertically. The bottom plate and the back plate are slidably connected in the horizontal direction. The bottom plate is connected to the force measuring wall, and the back plate is connected to the rigid components. The rigid components are combined to form an inverted T-shape.

[0006] The beneficial effects of this plan are:

[0007] 1. An inverted T-shaped mechanism is mounted on a force-measuring wall and suspended from a hoisting mechanism to maintain its horizontal and vertical position. This avoids inaccurate collision load measurements when the honeycomb aluminum barrier trolley collides head-on with the T-shaped mechanism due to gravity-induced state deviations. Compared to traditional rigid horizontal force-measuring devices, rigid components are used to replace the B-pillar and sill of a car in an actual collision, in order to more realistically simulate the stiffness differences of actual test vehicles under side-impact conditions. The honeycomb barrier is mounted on a trolley and the inverted T-shaped mechanism for collision tests. The trolley collides perpendicularly to the force-measuring wall, and the impact force borne by the inverted T-shaped mechanism is transmitted horizontally to the force-measuring wall through the back plate and bottom plate, thus obtaining collision data. The collision data is compared with the collision data of multiple real vehicle models colliding head-on with the T-shaped mechanism at test speeds. The actual side-impact honeycomb barrier corresponding to the collision data that meets the preset evaluation indicators is retained, and the collision data is numerically analyzed to develop a honeycomb barrier that closely approximates the side-impact test conditions of actual vehicles.

[0008] 2. Since forces are mutual, by measuring the collision data on the force-measuring wall, the forces acting on the honeycomb barrier can be analyzed, and then a honeycomb barrier that closely approximates the actual vehicle side-impact test conditions can be developed.

[0009] 3. Since the deformation of the honeycomb barrier is uneven during actual collision, this scheme sets up several rigid components to adapt to the uneven deformation of the honeycomb barrier. In this way, the impact force at different positions of the honeycomb barrier is transmitted to the force measuring wall through different rigid components, thereby improving the accuracy of the results.

[0010] 4. Because the base plate and back plate are connected in the horizontal direction by linear bearings, the collision load is transmitted only in the horizontal direction, thus ensuring the accuracy of the collision data.

[0011] 5. Cost-saving: The inverted T-shaped mechanism only replaces the B-pillar and sill in an actual collision. Compared with a full vehicle collision, the replacement cost is lower, the structure is simple, and it can simulate the non-uniform deformation of the vehicle impacted by the honeycomb aluminum barrier.

[0012] Furthermore, the rigid components are divided into column-type rigid components and several transverse rigid components. The transverse rigid components are symmetrically arranged on both sides of the column-type rigid components, forming an inverted T-shape. Several back plates are also provided, with each column-type rigid component and each transverse rigid component connected to a back plate. This configuration uses column-type rigid components to replace the B-pillar in an actual collision and transverse rigid components to replace the sill in an actual collision. The curvature of the column-type rigid structure and the aspect ratio of the transverse rigid mechanism's cross-section are obtained from analysis of a database of sample B-pillars and sills from real test vehicles, thus making the collision data more realistic.

[0013] Furthermore, several linear bearings are installed between the base plate and the back plate, with each end of the linear bearing connected to both the base plate and the back plate respectively. Each linear bearing contains a pressure spring. This arrangement has the following effects:

[0014] A horizontal sliding connection between the base plate and the back plate is achieved through linear bearings, which also guide the transmission of impact loads, ensuring that the impact load is transmitted vertically to the force measuring wall, thereby guaranteeing the accuracy and authenticity of the test results.

[0015] Furthermore, the backplates are all rectangular, with the linear bearings connected to the four corners of the backplate. This arrangement ensures that the linear bearings are evenly connected to the backplate, thereby improving the accuracy of the collision data.

[0016] Furthermore, several horizontal connectors are provided between each rigid component and the back plate, with both ends of the horizontal connectors connected to the rigid component and the back plate respectively. The column-type rigid component includes a horizontal rectangular tube and a column. The column includes a semi-circular arc column and a C-shaped reinforcing column. Both the semi-circular arc column and the C-shaped reinforcing column are vertically positioned in the middle of the horizontal rectangular tube. The semi-circular arc column is positioned on the side of the C-shaped reinforcing column away from the force-measuring wall, and the C-shaped reinforcing column provides support for the semi-circular arc column. A diagonal brace is provided between the C-shaped reinforcing column and the back plate. The transverse rigid component is a bent rectangular tube, including a horizontal section and an inclined section. The horizontal section is aligned with the horizontal rectangular tube, and the inclined section is positioned at the end of the horizontal section away from the horizontal rectangular tube. This arrangement has the following effects:

[0017] 1. The horizontal connector installed between the back plate and the rigid component can serve as a connection point with the hoisting mechanism, so that the inverted T-shaped mechanism of the hoisting mechanism can maintain a horizontal and vertical state; at the same time, it reduces the bending moment borne by the horizontal connector, reduces the lateral deformation of the horizontal connector in the collision, and improves the accuracy of the collision data.

[0018] 2. In a real collision, the upper part of the B-pillar is connected to the vehicle frame. In this solution, a semi-circular arc column is used to replace the B-pillar, and a C-shaped reinforcing column is used to increase the rigidity of the semi-circular arc column, reducing the deformation of the upper part of the semi-circular arc column due to lack of support, thereby ensuring that the collision data is closer to the real collision.

[0019] 3. By replacing the sill with horizontal rectangular tubes and transverse rigid components, the collision data is made closer to real collisions.

[0020] Furthermore, the horizontal connector is equipped with a pull ring; the hoisting mechanism includes a support unit and a flexible connector. The support unit is mounted on the force-measuring wall, the upper end of the flexible connector is connected to the support unit, and the lower end of the flexible connector is connected to the pull ring. The flexible connector can balance the vertical gravity of the rigid component. This arrangement, by providing a connection point for the flexible connector through the horizontal connector, better balances the vertical gravity of the T-shaped component.

[0021] Furthermore, the support unit is a cantilevered bracket, which is connected to the force-measuring wall. The flexible connectors include turnbuckles and several chains. The upper end of the turnbuckle is connected to the cantilevered bracket, the upper end of each chain is connected to the lower end of the turnbuckle, and the lower end of each chain is connected to a pull ring. This configuration has the following effects:

[0022] 1. Several chains are connected to turnbuckles simultaneously, with some chains set at an angle. The chains not only balance the vertical gravity, but also have horizontal components between them. These horizontal components act on the horizontal connectors, applying preload to them. The applied preload effectively balances the lateral movement of the horizontal connectors caused by horizontal collision loads, thus avoiding inaccurate test results caused by the resultant force of gravity and load not perpendicular to the force measuring wall, thereby ensuring the accuracy and authenticity of the test results.

[0023] 2. Adjust the length using turnbuckles to balance the weight of the T-shaped component and ensure that the horizontal connector is level.

[0024] Furthermore, the support unit includes a cantilever bracket and an electric hoist. The cantilever bracket is connected to the force-measuring wall, and the electric hoist is located at the cantilever end of the cantilever bracket. The flexible connector is a cable, and the electric hoist is connected to the upper end of the cable. A tension gauge is installed on the cable, which displays the tension of the cable. This configuration allows for adjustment of the cable tension via the electric hoist, and the tension gauge readings ensure balanced force on both sides of the inverted T-shaped mechanism, resulting in consistent tension gauge readings and improved accuracy of collision data.

[0025] Furthermore, the cantilever support is a right-angled triangular support made of rectangular tubes. Connecting plates are installed on the rectangular tubes on the side of the cantilever support, and these connecting plates are bolted to the force-measuring wall. Reinforcing angle steel is installed on the rectangular tubes on the lower side of the cantilever support, and the reinforcing angle steel is connected to the rectangular tubes on the lower side of the cantilever support along its entire length. One end of the reinforcing angle steel is connected to the connecting plate, and the other end is connected to the electric hoist. This design utilizes the stability of the triangle to ensure the structural strength of the cantilever support; the reinforcing angle steel improves the bending resistance of the lower side of the cantilever support; and it provides a connection point for the electric hoist.

[0026] Furthermore, several force sensors are installed between the base plate and the back plate. Each back plate is connected to at least three force sensors. The three force sensors on the corresponding back plates of the columnar rigid members form an equilateral triangle, and the three force sensors on the corresponding back plates of the transverse rigid members form an isosceles triangle. The base of the isosceles triangle is located on the side of the corresponding back plate closest to the columnar rigid member. This symmetrical arrangement of the force sensors places them within the area corresponding to each rigid member, avoiding cross-area placement, reducing the influence between adjacent rigid members, and thus improving the accuracy of collision results. Attached Figure Description

[0027] Figure 1 This is a three-dimensional isometric view of Example 1;

[0028] Figure 2 This is a three-dimensional isometric view of the inverted T-shaped mechanism in Example 1;

[0029] Figure 3 This is a diagram showing the arrangement of the linear bearing and force sensor in Example 1;

[0030] Figure 4 This is a side view of Example 1;

[0031] Figure 5 This is a three-dimensional isometric view of the linear bearing in Example 1;

[0032] Figure 6 This is a cross-sectional view of the linear bearing in Example 1;

[0033] Figure 7 This is a side view of Example 2. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: force measuring wall 1, bolt groove 110, inverted T-shaped mechanism 2, base plate 211, back plate 212, linear bearing 213, force sensor 214, horizontal rectangular tube 221, semi-circular arc column 222, C-shaped reinforcing column 223, thickened section 224, diagonal brace 225, horizontal section 231, inclined section 232, horizontal connector 240, pull ring 241, cantilever bracket 310, connecting plate 311, reinforcing angle steel 312, electric hoist 320, main cable 321, support cable 322, tensioner 323, turnbuckle 324, chain 325, fixing sleeve 410, guide rod 420, pressure spring 430, spring sleeve 440, nut 450, bearing sleeve 460, optical shaft 470, ball bearing 480, flange ring 490.

[0036] Example 1

[0037] Example 1 is basically as follows Figure 1-4 As shown: A test device for calibrating working conditions of an inverted T-shaped barrier, the test object being a honeycomb barrier, including an inverted T-shaped mechanism 2, a hoisting mechanism, and a force measuring wall 1.

[0038] like Figure 1 As shown, the force measuring wall 1 is a wall standing on the ground, and several horizontal strip-shaped bolt grooves 110 are opened on the force measuring wall 1.

[0039] The inverted T-shaped mechanism 2 includes an energy-absorbing unit and three rigid components, all of which are suspended on a hoisting mechanism. The energy-absorbing unit includes a parallel and vertically arranged base plate 211 and three back plates 212. The base plate 211 is bolted to the force-measuring wall 1. Both the base plate 211 and the back plates 212 are rectangular. Nine bearing units and twelve force sensors 214 are located between the base plate 211 and the back plates 212. Each back plate 212 is connected to three force sensors 214, forming three force-measuring points. These three force-measuring points define the same plane, ensuring uniform force distribution. Adding a force-measuring point might cause the force sensor plane to become non-coplanar, increasing the risk of uneven force distribution and causing measurement errors in impact loads. Simultaneously, the force sensors have a large range. As the number of sensors increases, the force received by each sensor decreases. When the force on a sensor is below its range, it may cause receiving errors. Three force sensors can effectively meet the requirements of uniform force distribution and the measurement accuracy of each sensor. Figure 2 , 3 As shown, each bearing unit is positioned at both ends of the rectangular corner of the back plate 212 and between the base plate 211.

[0040] Specifically, such as Figure 5 As shown, a fixing sleeve 410 is screwed onto the base plate 211. The bearing unit includes a linear bearing 213, a guide rod 420, a pressure spring 430, a spring sleeve 440, and a nut 450. The linear bearing 213 includes a bearing sleeve 460 and a light shaft 470. The light shaft 470 is slidably disposed within the bearing sleeve 460 and has an annular cross-section. A ball bearing 480 is provided between the light shaft 470 and the bearing sleeve 460. The lower outer wall of the light shaft 470 and the upper inner wall of the fixing sleeve 410 are interference-fitted. A flange ring 490 is integrally formed on the upper end of the bearing sleeve 460. After the upper end of the bearing sleeve 460 passes through the back plate 212, the flange ring 490 and the back plate 212 are bolted together. The spring sleeve 440... The guide rod 420 is positioned above the flange ring 490 and vertically passes through the spring sleeve 440, flange ring 490, bearing sleeve 460, optical shaft 470, and fixing sleeve 410 in sequence. The lower end of the guide rod 420 is welded to the base plate 211. The pressure spring 430 is sleeved on the guide rod 420 and is located inside the spring sleeve 440. In the vertical direction, the pressure spring 430 is also located between the nut 450 and the optical shaft 470. The lower end of the pressure spring 430 is bonded to the optical shaft 470. The nut 450 is threaded to the upper end of the guide rod 420 and cooperates with the flange ring 490 to press the spring sleeve 440 and pre-tighten the bolts. The linear bearing 213 provides rolling support for the guide rod 420.

[0041] The base plate 211 has a mounting surface. For ease of installation and stability, the force sensor 214 is connected to the mounting surface with four bolts. The bottom of the force sensor 214 is on the mounting surface. The force sensor 214 is used to receive the impact load from the honeycomb aluminum barrier. Through the above connection method, the impact load received by the back plate 212 can be evenly transmitted to the force sensor 214. The force measuring device can obtain the accurate impact load in the impact direction of the honeycomb aluminum barrier by receiving and processing the corresponding signals.

[0042] Twelve linear bearings 213 constrain multiple degrees of freedom of the back plate 212, preventing it from swaying or deflecting under impact loads, and allowing the impact load to be transmitted only along the axial direction of the linear bearings 213. Because undesirable movements such as swaying or deflection of the guide back plate 212 are avoided, the back plate 212, constrained by the twelve linear bearings 213, can only tend to translate along the axial direction. This further prevents swaying or deflection of the back plate 212 during impact, ensuring stable force transmission between the collimation units. The force sensor 214 will not experience significant signal fluctuations that would affect the dynamic impact error of the honeycomb aluminum barrier, thus ensuring its dynamic impact performance. It is understandable that without the twelve linear bearings 213, even slight lateral displacement, torsion, or deflection of the back plate 212 would affect the instability of the signal received by the force sensor 214, significantly impacting measurement accuracy.

[0043] One end of the linear bearing 213 is mounted on the end face of the back plate 212, and the other end is mounted on the end face of the base plate 211. Both end faces are planar. During assembly, the two end faces are arranged parallel to each other, so that the back plate 212 can only slide and translate, and will not rotate along the end faces, thus ensuring the stability of the back plate 212 connected by multiple linear bearings 213. A pressure spring 430 is installed in the spring sleeve 440 for clamping, which can prevent wobbling between the back plate 212 and the linear bearing 213. Therefore, improving the stability of the back plate 212 is an important consideration for improving the force measuring device. In addition, to ensure accuracy, the relative displacement between the bearing sleeve 460 and the fixed sleeve 410 is small during collision, making it relatively microscopic. Therefore, in Figure 6 No obvious gap was observed between the bearing sleeve 460 and the fixed sleeve 410.

[0044] To address this, the present invention first fixes the back plate 212 and the base plate 211 together with 12 linear bearings 213, and then slides the linear bearings 213 to the guide rod 420. The sliding movement between the guide rod 420 and the linear bearings 213, along with multiple identical connections on the back plate 212 and the base plate 211, constitutes this structure. This structure effectively restricts the degree of freedom of movement of the back plate 212 under impact loads, ensuring it can only move stably along the axis of the guide rod 420, greatly improving the measurement accuracy of the measuring device. It is understandable that if only a few sets of linear bearings 213 are used to provide guidance and support for the guide rod 420, the gaps between the balls of the linear bearings 213 will more or less affect the stability of the guide rod 420, for example, causing the guide rod 420 to wobble within the linear bearings 213, thus leading to measurement errors. In this solution, four sets of linear bearings 213 are provided for each back plate 212 and base plate 211, increasing the guiding accuracy of the guiding elements. This further restricts the degrees of freedom of movement of the backplate 212 and improves its stability.

[0045] like Figure 2 As shown, the rigid components are divided into column-type rigid components and two transverse rigid components. The two transverse rigid components are symmetrically arranged on both sides of the column-type rigid component to form an inverted T-shape. Specifically, the column-type rigid component includes mutually perpendicular horizontal rectangular tubes 221 and columns. The columns include a semi-circular arc column 222 and a C-shaped reinforcing column 223. Both the semi-circular arc column 222 and the C-shaped reinforcing column 223 are vertically welded to the upper surface of the middle part of the horizontal rectangular tube 221. The semi-circular arc column 222 is located on the side of the C-shaped reinforcing column 223 away from the force-measuring wall 1. The opening of the C-shaped reinforcing column 223 faces right and abuts against the semi-circular arc column. The inner arc surface of 222 has a C-shaped reinforcing column 223 that provides support for the semi-circular arc column 222. A diagonal brace 225 is welded between the C-shaped reinforcing column 223 and the back plate 212. The diagonal brace 225 is a rectangular tube. A thickened section 224 is provided on the right side of the semi-circular arc column 222. The thickened section 224 is a polytetrafluoroethylene sheet. The transverse rigid member is a bent rectangular tube with a 45° bend. The transverse rigid member includes a horizontal section 231 and an inclined section 232. The horizontal section 231 and the horizontal rectangular tube 221 are aligned but not connected to each other. The inclined section 232 is located at the end of the horizontal section 231 away from the horizontal rectangular tube 221. In actual side-impact collision scenarios, after the collision between the honeycomb obstacle avoidance system and the test vehicle, due to the difference in stiffness of different parts of the test vehicle's side, the honeycomb aluminum barrier will produce corresponding indentations when impacting the B-pillar and sill. In this solution, by statistically analyzing the range and shape of the indentations produced by the honeycomb obstacle avoidance system in real collisions, the amplitude of the outer surface of the rigidly constructed B-pillar and sill is designed to have a shape that is highly correlated with the indentations of the honeycomb aluminum barrier in real collisions, thereby making the test results closer to the real data.

[0046] One rigid member corresponds to one back plate 212, such as Figure 3As shown, the three force sensors 214 on the back plate 212 of the column-type rigid member form an equilateral triangle, and the three force sensors 214 on the back plate 212 of the transverse rigid member form an isosceles triangle. The base of the isosceles triangle is located on the side of the back plate 212 closest to the column-type rigid member. Several horizontal connectors 240 are provided between the rigid member and the corresponding back plate 212. The horizontal connectors 240 are rectangular tubes, and their two ends are welded to the rigid member and the back plate 212, respectively. Pull rings 241 are provided on the horizontal connectors 240.

[0047] like Figure 1 As shown, the hoisting mechanism includes three hoisting units, each positioned directly above each rigid component. Each hoisting unit includes a support unit and a flexible connector. The support unit includes a cantilever bracket 310 and an electric hoist 320. In this embodiment, the electric hoist 320 is a PA800 miniature electric hoist 320. Figure 4 As shown, the cantilever support 310 is a right-angled triangular support made of rectangular tubes. A connecting plate 311 is welded to the rectangular tube on the side of the cantilever support 310. The connecting plate 311 is bolted to the force-measuring wall 1. A reinforcing angle steel 312 is horizontally installed on the rectangular tube on the lower side of the cantilever support 310. The reinforcing angle steel 312 is welded to the rectangular tube on the lower side of the cantilever support 310 along its entire length. The left end of the reinforcing angle steel 312 is connected to the connecting plate 311, and the right end of the reinforcing angle steel 312 is bolted to the electric hoist 320. Flexible connection... The connector is a cable, which can balance the vertical gravity of the rigid component. The specific cable includes a main cable 321 and several branch cables 322. The upper end of the main cable 321 is wound around the electric hoist 320. The upper ends of the branch cables 322 are all welded to the lower ends of the main cable 321. The lower ends of the branch cables 322 are all hung on the pull ring 241 of the horizontal connector 240 of the corresponding rigid component. Each branch cable 322 is equipped with a tensioner 323, which can display the tension of the branch cable 322.

[0048] Several support cables 322 are simultaneously connected to the main cable 321. Some support cables 322 are inclined. The support cables 322 not only balance the vertical gravity, but also have a horizontal component force among themselves. This horizontal component force acts on the horizontal connector 240, applying preload to the horizontal connector 240. Figure 1 As shown, taking the left-side transverse rigid member as an example, two support cables 322 are respectively inclinedly pulled on the pull rings of the horizontal connectors corresponding to the transverse rigid member. The two support cables 322 are the left support cable 322 and the right support cable 322. When a collision occurs, the impact force parallel to the force measuring wall 1 causes the horizontal connector 240 to tend to move laterally. If the tendency to move laterally is to the left, the preload generated by the left support cable 322 can counteract the tendency of the horizontal connector 240 to move laterally to the left. At the same time, since the right support cable 322 becomes loose, the preload generated by the right support cable 322 is reduced accordingly.

[0049] The method of using an inverted T-shaped barrier calibration test device is as follows:

[0050] 1. Install the inverted T-shaped mechanism 2 and the hoisting mechanism on the force measuring wall 1, hang the lower end of the cable on the pull ring 241, and adjust the tension of the cable by the electric hoist 320 so that the values ​​on the tension gauges on both sides of the column rigid component are symmetrical and equal.

[0051] 2. Install the honeycomb barrier on the trolley, and have the trolley impact the surface of the inverted T-shaped mechanism 2 at a 90° vertical angle with an impact speed of 35±1 km / h. The leading edge of the honeycomb barrier should overlap the horizontal rectangular tube 221 of the T-shaped mechanism by 75mm±15mm, and the centerline of the honeycomb barrier should deviate from the centerline of the T-shaped mechanism by no more than ±15mm.

[0052] 3. During the collision, the impact force is transmitted to the force sensor 214 through the rigid member and backplate 212, thus generating collision data. The average of 100 data points prior to the collision (50 to 40 ms before the collision) is calculated, any initial offset starting from zero is removed from each data channel, and each average value is subtracted from its respective data channel. All data is filtered according to the Channel Frequency (CFC) 60 defined in SAE Standard Ground Vehicle Recommended Implementation Guidelines J211 / 1 (2014). All filtering and subsequent calculations are performed using data analysis software. All measurements are recorded at a sampling frequency of 10 kHz. Signals in all channels are converted simultaneously, ensuring no time skew in the time references of different channels. The data from the force sensor 214 corresponding to each backplate 212 are summed to obtain the overall resultant force curve. Data from any overlapping force sensor 214 are excluded from the calculation.

[0053] Example 2

[0054] The difference between Embodiment 2 and Embodiment 1 is that the support unit only includes the cantilever bracket 310, and the cantilever bracket 310 and the force-measuring wall 1 are bolted together, as shown below. Figure 7 As shown, the flexible connector includes a turnbuckle 324 and several chains 325. The upper end of the turnbuckle 324 is hooked to the cantilever bracket 310, the upper ends of the chains 325 are hooked to the lower ends of the turnbuckle 324, and the lower ends of the chains 325 are hooked to the pull ring 241. The tension of the chains 325 can be adjusted by adjusting the length of the turnbuckle 324.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A test device for calibrating inverted T-shaped barriers, characterized in that: It includes an inverted T-shaped mechanism, a hoisting mechanism, and a force measuring wall. The inverted T-shaped mechanism includes an energy-absorbing unit and several rigid components. The rigid components are all hung on the hoisting mechanism. The energy-absorbing unit includes a bottom plate and a back plate that are parallel and vertically arranged. The bottom plate and the back plate are slidably connected in the horizontal direction. The bottom plate is connected to the force measuring wall, and the back plate is connected to the rigid components. The rigid components are combined to form an inverted T-shape. The rigid components are divided into column-type rigid components and several transverse rigid components. The transverse rigid components are symmetrically arranged on both sides of the column-type rigid components to form an inverted T-shape. The back plate is provided with several components, and each of the column-type rigid components and the transverse rigid components is connected to a back plate. Several linear bearings are provided between the base plate and the back plate. Both ends of the linear bearings are connected to the base plate and the back plate respectively. Pressure springs are provided inside the linear bearings. The back plates are all rectangular, and the linear bearings are connected to the four corners of the back plates; Several horizontal connectors are provided between each rigid member and the back plate, with both ends of the horizontal connectors connected to the rigid member and the back plate respectively; the column-type rigid member includes a horizontal rectangular tube and a column, the column includes a semi-circular arc column and a C-shaped reinforcing column, both of which are vertically set in the middle of the horizontal rectangular tube, the semi-circular arc column is set on the side of the C-shaped reinforcing column away from the force measuring wall, and the C-shaped reinforcing column provides support for the semi-circular arc column; there is a diagonal brace between the C-shaped reinforcing column and the back plate; the transverse rigid member is a bent rectangular tube, which includes a horizontal section and an inclined section, the horizontal section is aligned with the horizontal rectangular tube, and the inclined section is set at the end of the horizontal section away from the horizontal rectangular tube.

2. The inverted T-shaped barrier calibration test equipment according to claim 1, characterized in that: The horizontal connector is equipped with a pull ring; the hoisting mechanism includes a support unit and a flexible connector. The support unit is set on the force measuring wall. The upper end of the flexible connector is connected to the support unit, and the lower end of the flexible connector is connected to the pull ring. The flexible connector can balance the vertical gravity of the rigid component.

3. The inverted T-shaped barrier calibration test equipment according to claim 2, characterized in that: The support unit is a cantilever bracket, which is connected to the force-measuring wall. The flexible connectors include turnbuckles and several chains. The upper end of the turnbuckle is connected to the cantilever bracket, the upper end of each chain is connected to the lower end of the turnbuckle, and the lower end of each chain is connected to a pull ring.

4. The inverted T-shaped barrier calibration test equipment according to claim 3, characterized in that: The support unit includes a cantilever bracket and an electric hoist. The cantilever bracket is connected to the force measuring wall. The electric hoist is installed at the cantilever end of the cantilever bracket. The flexible connector is a cable. The electric hoist is connected to the upper end of the cable. A tensioner is installed on the cable, which can display the tension of the cable.

5. The inverted T-shaped barrier calibration test equipment according to claim 4, characterized in that: The cantilever support is a right-angled triangular support made of rectangular tubes. A connecting plate is provided on the rectangular tube on the side of the cantilever support. The connecting plate is bolted to the force measuring wall. A reinforcing angle steel is provided on the rectangular tube on the lower side of the cantilever support. The reinforcing angle steel is connected to the rectangular tube on the lower side of the cantilever support along its entire length. One end of the reinforcing angle steel is connected to the connecting plate, and the other end of the reinforcing angle steel is connected to the electric hoist.

6. The inverted T-shaped barrier calibration test equipment according to claim 5, characterized in that: Several force sensors are provided between the base plate and the back plate. Each back plate is connected to at least three force sensors. The column-type rigid member forms an equilateral triangle with the three force sensors on the back plate, and the transverse rigid member forms an isosceles triangle with the three force sensors on the back plate. The base of the isosceles triangle is located on the side of the corresponding back plate closer to the column-type rigid member.

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