Test mechanism for simulating collision in free surface

Abstract

The invention relates to a test mechanism for simulating collision in a free surface, the test mechanism comprises a supporting table top, and an impact launching control device and a collided body control adjusting device which are arranged on the supporting table top, the impact launching control device comprises an impact driving unit, an impact guiding unit and an impact parameter measuring unit, the collision driving unit is connected with the collision guiding unit, the collision parameter measuring unit is arranged on the axis in the collision direction, and a collision body is driven by the collision driving unit to act and guided by the collision guiding unit; the collided body control and adjustment device comprises an adjustable supporting unit used for containing the collided body and adjusting the height of the collided body, and the adjustable supporting unit and the collision entering guide unit are concentrically arranged. Compared with the prior art, the method has the advantages that the collision body is stable and controllable, and in-plane collision data can be ensured to be reliable and accurate.

Description

Technical Field

[0001] The invention relates to the technical field of in-plane collision tests, and in particular to a simulated free in-plane collision test mechanism. Background Art

[0002] In-plane collision test refers to the collision test between the test sample and the collision object in a certain plane, which is usually used to evaluate the performance of the sample in terms of crash resistance, safety and occupant protection during the collision. This test is widely used in the fields of automobiles, aerospace, vehicle seats, safety protection equipment, etc.

[0003] The in-plane collision test is an important test method for analyzing the collision mechanism and collision theory principles. The usual test method is to simulate the free state by suspending the object with a suspension wire, and to give the initial collision speed by pulling it to a certain swing angle and releasing it freely, so that the impacting body and the impacted body produce an in-plane collision to simulate a free in-plane collision. In this process, since the impacting body cannot be effectively controlled during the suspension wire suspension and free release process, the collision point often deviates from the preset point, and the impact direction is difficult to control within the impact plane, and the test process is difficult to repeat. This also makes it difficult to obtain effective test data or the data deviation is large. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a simulated free in-plane collision test mechanism in which the impact body is stable and controllable and ensures that the in-plane collision data is reliable and accurate.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A simulated free-surface collision test mechanism comprises a support table and an impact launch control device and a collision object control and adjustment device arranged on the support table, wherein:

[0007] The collision launch control device comprises a collision drive unit, a collision guide unit and a collision parameter measurement unit, wherein the collision drive unit is connected to the collision guide unit, and the collision parameter measurement unit is arranged on an axis along the collision direction, and the collision body is driven by the collision drive unit and guided by the collision guide unit;

[0008] The collision object control and adjustment device comprises an adjustable support unit for placing the collision object and adjusting the height of the collision object, and the adjustable support unit is arranged concentrically with the collision guide unit.

[0009] Furthermore, the impact drive unit includes a pneumatic ejector connected to the impact body.

[0010] Furthermore, the pneumatic catapult is a pneumatic catapult with adjustable impact speed.

[0011] Furthermore, the impact guide unit includes a plurality of concentrically arranged guide shafts, and the impact body passes through each guide shaft in sequence.

[0012] Furthermore, a ball bearing is arranged at the contact point between the guide shaft and the impact body.

[0013] Furthermore, the adjustable support unit includes a plurality of support screws, and each support screw is movably mounted on the support table through a threaded hole provided on the support table.

[0014] Furthermore, a ball bearing is provided at the contact point between each of the supporting screws and the struck object.

[0015] Furthermore, the impact parameter measurement unit includes a collision force sensor and a laser velocimeter. The collision force sensor is installed at the collision end of the impact body, and the laser velocimeter is installed at the edge of the support table to measure the speed of the collision end of the impact body and the impacted body.

[0016] Furthermore, a blocking plate is provided along the axis of the impact direction to prevent the impacted body and the impacting body from flying backward out of the supporting table surface after the collision.

[0017] Furthermore, it also includes a high-speed DIC non-contact measurement system for recording the collision process and obtaining a full-field strain cloud map of the collision process using DIC technology.

[0018] Compared with the existing suspension-type free-surface collision test mechanism, the present invention has the advantages of stable and controllable impact body, controllable and stable collision point and impact direction, etc., which well solves the problem of poor stability of the current free-surface collision test. Specifically, the present invention has the following beneficial effects:

[0019] 1. The present invention designs an impact guide unit for the impact body, which can effectively support the impact body and play a guiding role at the same time, ensuring that the impact body can only move in the direction of the impact surface and remain stable at all times; further, the present invention uses balls to ensure that the impact body minimizes the influence of friction during the impact process, so that it is as close to a free state as possible in the impact direction.

[0020] 2. The object to be collided in the present invention is designed with an adjustable support unit, which facilitates the adjustment of the support height and horizontality of the object to be collided, ensuring that the impact rod hits the middle position of the thickness of the object to be collided, thereby improving the test accuracy; further, the present invention utilizes embedded balls to ensure that the frictional resistance of the object to be collided can be reduced in the impact direction while being supported, making it close to a free motion state, thereby maintaining the stability of the object to be collided while ensuring its free motion state.

[0021] 3. The present invention adopts an impact speed adjustable pneumatic catapult, which can provide different impact speeds and realize in-plane collision tests under different impact speeds.

[0022] 4. The present invention is provided with an impact parameter measurement unit, which can monitor the impact force of the impact body and the speed changes of the impact body and the impacted body in the whole test process in real time.

[0023] 5. The present invention sets up a high-speed DIC non-contact measurement system for the collision process, which can monitor the collision test process and the full-field stress response and conduction process of the impacted body in real time; at the same time, the measurement system can realize non-contact measurement, thereby avoiding the influence of the measurement process on the collision test, and the measurement system can realize the measurement of full-field displacement, velocity and strain data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A top view of the mechanism of the present invention;

[0025] Figure 2 It is a front view of the mechanism of the present invention;

[0026] Among them, 1. Support table; 2. Impacting body; 3. Impacted body; 4. Pneumatic catapult; 5. Guide shaft; 6. Collision force sensor; 7. Laser velocimeter; 8. Blocking plate; 9. Support screws; 10. High-speed DIC non-contact measurement system. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] refer to Figure 1 and Figure 2 As shown, this embodiment provides a simulated free in-plane collision test mechanism, including a support table 1 and an impact launch control device and a collision object control and adjustment device arranged on the support table 1, an impact body 2 is arranged on the impact launch control device, and a collision object 3 is arranged on the collision object control and adjustment device. The impact body 2 hits the collision object 3 under the driving guidance of the impact launch control device, thereby completing the in-plane collision test. In this embodiment, the impact body 2 is a cylindrical rod structure, and the collision object 3 is a disc structure.

[0029] The impact launch control device includes an impact drive unit, an impact guide unit and an impact parameter measurement unit. The impact drive unit and the impact guide unit are connected. The impact parameter measurement unit is arranged on an axis along the impact direction. The impact body 2 is driven by the impact drive unit and guided by the impact guide unit.

[0030] Specifically, the impact drive unit includes a pneumatic ejector 4 connected to the impact body 2, which is used to generate the impact speed of the impact body 2. In a preferred embodiment, the pneumatic ejector 4 is an impact speed adjustable pneumatic ejector, which can change the impact speed of the impact body by adjusting the pneumatic pressure.

[0031] In other embodiments, the impact drive unit may also adopt other adjustable driving structures such as electromagnetic catapults, hydraulic catapults, etc.

[0032] The impact guide unit includes a plurality of concentrically arranged guide shafts 5, and the impact body 2 passes through each guide shaft 5 in sequence. In this embodiment, four guide shafts 5 are provided, which are distributed to support and guide the impact body 2, so as to ensure that the impact body 2 always maintains the stability of the movement direction and speed. In a preferred embodiment, a ball is provided at the contact point between the guide shaft 5 and the impact body 2, and the ball is used to ensure that the impact body 2 minimizes the friction effect of the guide shaft 5 during the impact process, so that it is as close to a free state as possible in the impact direction.

[0033] The collision object control and adjustment device comprises an adjustable support unit for placing the collision object 3 and adjusting the height of the collision object 3 . The adjustable support unit is concentrically arranged with the collision guide unit.

[0034] Specifically, Figure 2 As shown, the adjustable support unit includes a plurality of support screws 9, and each support screw 9 is movably mounted on the support table 1 through a threaded hole provided on the support table 1. In this embodiment, three support screws 9 are provided, and a plurality of threaded holes are provided on the support table 1. According to the test requirements, three appropriate threaded holes are selected to screw in the support screws, and the support height and the level of the object to be collided are adjusted by the screwing depth of the support screws. In a preferred embodiment, an embedded ball is provided at the contact point between each support screw 9 and the object to be collided 3. The embedded ball ensures that the friction resistance of the object to be collided can be reduced in the direction of impact while being supported, so that it is close to a free motion state, which not only maintains the stability of the object to be collided but also ensures its free motion state.

[0035] In other embodiments, the adjustable support unit may also adopt a spring preload force adjustment support unit, a hydraulic pressure adjustment support unit or a gas pressure adjustment support unit.

[0036] The impact parameter measurement unit includes a collision force sensor 6 and a laser velocimeter 7. The collision force sensor 6 is installed at the collision end of the impact body 2, and the laser velocimeter 7 is installed at the edge of the support table 1. The laser velocimeter 7 has two measuring points for measuring the speed of the collision end of the impact body 2 and the impacted body 3.

[0037] In a preferred embodiment, a blocking plate 8 is further provided along the axis of the impact direction to prevent the impacted body 3 and the impacting body 2 from flying backward out of the supporting table 1 after the collision.

[0038] In a preferred embodiment, the mechanism also includes a high-speed DIC non-contact measurement system 10, which is used to record the collision process and obtain the full-field strain cloud map of the collision process using DIC technology. The measurement system can realize non-contact measurement, thereby avoiding the influence of the measurement process on the collision test, and the measurement system can realize the measurement of full-field displacement, velocity and strain data.

[0039] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A simulated free surface collision test mechanism, characterized in that: It comprises a support table (1) and an impact launch control device and a collision object control and adjustment device arranged on the support table (1), wherein: The collision launch control device comprises a collision drive unit, a collision guide unit and a collision parameter measurement unit, wherein the collision drive unit and the collision guide unit are connected, and the collision parameter measurement unit is arranged on an axis along the collision direction, and the collision body (2) is driven by the collision drive unit and guided by the collision guide unit; The collision object control and adjustment device comprises an adjustable support unit for placing the collision object (3) and adjusting the height of the collision object (3); the adjustable support unit is arranged concentrically with the collision guide unit.

2. The simulated free surface collision test mechanism according to claim 1, characterized in that: The impact drive unit comprises a pneumatic ejector (4) connected to the impact body (2).

3. The simulated free surface collision test mechanism according to claim 2, characterized in that: The pneumatic catapult (4) is a pneumatic catapult with adjustable impact speed.

4. The simulated free surface collision test mechanism according to claim 1, characterized in that: The impact guide unit comprises a plurality of concentrically arranged guide shafts (5), and the impact body (2) passes through each guide shaft (5) in sequence.

5. The simulated free surface collision test mechanism according to claim 4, characterized in that: A ball bearing is arranged at the contact point between the guide shaft (5) and the impact body (2).

6. The simulated free surface collision test mechanism according to claim 1, characterized in that: The adjustable support unit comprises a plurality of support screws (9), each support screw (9) being movably mounted on the support table (1) through a threaded hole provided on the support table (1).

7. The simulated free surface collision test mechanism according to claim 6, characterized in that: A ball bearing is provided at the contact point between each of the supporting screws (9) and the object to be struck (3).

8. The simulated free surface collision test mechanism according to claim 1, characterized in that: The collision parameter measurement unit comprises a collision force sensor (6) and a laser velocimeter (7), wherein the collision force sensor (6) is mounted on the collision end of the collision body (2), and the laser velocimeter (7) is mounted on the edge of the support table (1) and is used to measure the speed of the collision end of the collision body (2) and the collision body (3).

9. The simulated free surface collision test mechanism according to claim 1, characterized in that: A blocking plate (8) is also provided on the axis along the collision direction to prevent the collided body (3) and the impacting body (2) from flying backwards out of the supporting table surface (1) after the collision.

10. The simulated free surface collision test mechanism according to claim 1, characterized in that: It also includes a high-speed DIC non-contact measurement system (10) for recording the collision process and obtaining a full-field strain cloud map of the collision process using the DIC technology.

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