Fixed rolling collision test method

Abstract

The invention belongs to the technical field of collision tests, and particularly relates to a fixed rolling collision test method, and a test bed used in a rolling collision test comprises a test bed frame, a collision table board, a sliding assembly, and an electric cylinder at the bottom of the collision table board. The method comprises the following steps: S1, determining rolling collision test configuration parameters according to current working condition requirements of a rolling collision test and test vehicle parameters; the working condition requirements comprise a test vehicle collision horizontal speed, a test vehicle collision vertical speed and a test vehicle collision rotating speed, the test vehicle parameters comprise the whole test vehicle mass, and the rolling collision test configuration parameters comprise the rotating speed of a rotating motor, the horizontal distance between the initial position of a sliding assembly and a collision table top and the starting time of an electric cylinder; s2, installing a test vehicle; s3, adjusting the rotating speed of a rotating motor to reach the test vehicle collision rotating speed, starting a traction motor to drive a sliding assembly, and driving an electric cylinder according to the starting moment of the electric cylinder to lift a collision table top to collide with the test vehicle; and S4, collecting and storing test data.

Description

Technical Field

[0001] The present invention relates to the technical field of collision tests, and particularly to a fixed-roll collision test method. Background Art

[0002] Currently, the commonly used vehicle collision simulation methods mainly include full-scale vehicle collision tests and bench simulation tests. Full-scale vehicle collision tests are costly and pose significant safety risks, making it difficult to conduct a large number of repetitive tests. Thus, bench simulation tests have become an important alternative.

[0003] Currently, when using the bench simulation test method for vehicle collision experiments, the vertical speed in vehicle roll collision tests is usually simulated by free fall. This method relies on a fixed acceleration, only providing a fixed acceleration mode, unable to flexibly adjust the vertical initial velocity, capable of simulating fewer working conditions, and difficult to truly reproduce the situation of a vehicle falling from a relatively high altitude in a rollover accident, unable to provide rich data support, thus affecting the accuracy of test results. The horizontal speed of roll collision is simulated by launching a collision sled, only simulating the translation at the moment of collision, relying on instantaneous acceleration (such as pneumatic / hydraulic ejection), difficult to achieve high-precision speed adjustment, ignoring the influence of the mass distribution of the vehicle's own power system (such as the engine, drive shaft) on the roll attitude, and may also cause fluctuations in the initial velocity, affecting the test repeatability. Summary of the Invention

[0004] The present invention provides a fixed-roll collision test method to solve the problems of poor repeatability and inaccurate test results in existing roll collision tests.

[0005] The solution provided by the present invention: A fixed-roll collision test method, the test bench for roll collision tests includes a test bench frame and a collision tabletop. A sliding component driven by a traction motor is arranged on the test bench frame to slide horizontally on the bench. A rotating shaft connected to a rotating motor is arranged on the sliding component for installing the test vehicle. An electric cylinder is arranged at the bottom of the collision tabletop for driving the collision tabletop to rise and collide with the test vehicle. The test method includes the following steps: S1: Determine the configuration parameters of the roll collision test according to the current working condition requirements of the roll collision test and the parameters of the test vehicle; the working condition requirements include the horizontal collision speed of the test vehicle, the vertical collision speed of the test vehicle, the rotational speed of the test vehicle during collision, and the parameters of the test vehicle include the total mass of the test vehicle. The configuration parameters of the roll collision test include the rotational speed of the rotating motor, the horizontal distance between the initial position of the sliding component and the collision tabletop, and the starting moment of the electric cylinder; S2: Install the test vehicle according to the configuration parameters of the roll collision test and set the initial position of the sliding component; S3: Adjust the rotational speed of the rotary motor to make the rotational speed of the rotary arm reach the collision speed of the test vehicle. Meanwhile, start the traction motor to drive the sliding assembly, and then drive the electric cylinder according to the starting moment of the electric cylinder, so that the collision tabletop rises to collide with the test vehicle, simulating the rollover collision condition of the test vehicle; S4: Collect and save the test data.

[0006] The principle and advantages of this solution are as follows: 1. According to the horizontal collision speed, vertical collision speed, and collision rotational speed of the test vehicle required by the test conditions, this invention sets the test configuration parameters, which can be independently regulated for multiple parameters. By precisely controlling the rotary motor (collision rotational speed), traction motor (horizontal speed), and electric cylinder (vertical speed), the multi-dimensional collision conditions (horizontal / vertical speed + rotational state) in a real rollover accident can be reproduced, which is closer to complex conditions than traditional inclined plane rollover or projectile tests, facilitating various test conditions, providing rich data support for subsequent performance analysis of the test vehicle during rollover collisions, helping to deeply study the performance of the test vehicle's structural strength, safety performance, etc. under rollover collision conditions, and providing a strong basis for vehicle design improvement and safety standard formulation.

[0007] 2. Before the test, the test vehicle can be conveniently installed and the position of the sliding assembly can be set according to the rollover collision test configuration parameters, and the rotational speed of the rotary motor, the sliding of the sliding assembly, and the starting time of the electric cylinder can be flexibly adjusted. This makes this test method adaptable to various types and specifications of test vehicles and different test condition requirements, with high versatility and flexibility.

[0008] 3. During the test, by adjusting the rotational speed of the rotary motor to make the rotational speed of the rotary arm reach the collision speed of the test vehicle, starting the traction motor to drive the sliding assembly at the same time, and then driving the electric cylinder according to the set starting moment of the electric cylinder to make the collision tabletop rise to collide with the test vehicle, the actions of each link in the whole process can be precisely controlled, ensuring the stability and repeatability of the test process, which is beneficial to improving the accuracy and reliability of the test results. In addition, the sequential coordination design of the starting moment of the electric cylinder and the movement of the sliding assembly ensures the perfect matching of the tabletop rising and the vehicle movement at the moment of collision, avoiding simulation distortion caused by phase difference.

[0009] Compared with the prior art, this invention realizes the precise synthesis of three-dimensional collision conditions on a fixed test bench through the coupling of three degrees of freedom of "horizontal sliding + rotation + vertical jacking", providing more comprehensive test data for vehicle safety structure optimization. Traditional limitations: Compared with existing rollover tests, it avoids the inability to control the horizontal / vertical speed ratio in inclined plane rollover tests and the difficulty of superimposing rotation in catapult rollover tests.

[0010] Preferably, the height difference between the sliding component and the collision tabletop is set according to the vertical collision speed of the test vehicle, the parameters of the test vehicle, the mass of the collision tabletop, and the performance parameters of the electric cylinder. The performance parameters of the electric cylinder include the electric cylinder load coefficient and the electric cylinder response time. Specifically, the following relationship exists:

[0011] In the formula, h is the height difference between the sliding component and the collision tabletop, is the maximum test value of the vertical collision speed of the test vehicle, is the mass of the electric cylinder piston, is the mass of the collision tabletop, is the electric cylinder load coefficient, is the electric cylinder response time, is the sum of the maximum mass load of the sliding component and the mass of the sliding component.

[0012] Beneficial effects: Referring to the parameters of the test vehicle, the collision tabletop, the electric cylinder, etc. on the test bench, as well as the test conditions that the test bench can withstand, the height difference between the sliding component and the collision tabletop is designed to ensure that the electric cylinder can lift the collision tabletop at the target speed to collide with the test vehicle, which is beneficial to the standardization and standardization of the test process.

[0013] Preferably, the test bench further includes multiple sets of connection tools with different sizes. The test vehicle is installed on the rotating shaft through the connection tools. The rotating motor is installed on the sliding component. The rotating shaft is fixedly connected to the rotating motor shaft. In S1, the configuration parameters of the rolling collision test further include the size of the connection tool, and the size of the connection tool is determined according to the height difference between the center of mass of the test vehicle and the rotating motor shaft.

[0014] Beneficial effects: The test vehicle is fixedly connected to the rotating shaft through the connection tool to ensure the safety and reliability of the test; the connection tool is set as multiple sets with different sizes, and according to the requirements of the test conditions for the rotation center of the test vehicle, the corresponding connection tool is selected to adjust the height difference between the center of mass of the test vehicle and the rotating motor shaft to achieve the purpose of different rotation centers of the test vehicle.

[0015] Further preferably, the rotation speed of the rotating motor is determined according to the height difference between the center of mass of the test vehicle and the rotating motor shaft. The determination rule of the rotation speed of the rotating motor is as follows: When the height difference between the center of mass of the test vehicle and the rotating motor shaft is less than 20 mm, the rotation speed of the rotating motor is the collision rotation speed of the test vehicle; When the height difference between the center of mass of the test vehicle and the rotating motor shaft is greater than or equal to 20 mm, the rotation speed of the rotating motor is calculated according to the following formula,

[0016] In the formula, is the rotational speed of the rotating motor, is the moment of inertia of the test vehicle body, is the height difference between the center of mass of the test vehicle and the axis of the rotating motor, is the sum of the mass load of the sliding assembly and the mass of the sliding assembly under the current working condition, is the collision rotational speed of the test vehicle, and the mass load of the sliding assembly includes the sum of the masses of the sliding assembly, the connecting tooling, the rotating shaft, and the entire vehicle mass of the test vehicle.

[0017] Beneficial effects: Considering the influence of the structural characteristics of the test vehicle itself on rotational motion, adjusting the rotational speed of the rotating motor according to the height difference between the center of mass of the test vehicle and the axis of the rotating motor to make up for the influence of the center of mass of different test vehicles on the collision rotational speed. For test vehicles of different types and structures, a more reasonable rotational speed setting of the rotating motor can be given, making the rotational motion of the test vehicle during the test more in line with the expected working conditions, reducing test errors caused by unreasonable speed settings, improving the repeatability and reliability of the test, and providing more reliable data support for vehicle safety performance research, structural design improvement, etc. At the same time, it expands the applicable range of this test method and test bench, can meet the requirements of rollover collision tests for different vehicle models, and helps to provide extensive and effective test support in aspects such as vehicle R & D and safety standard formulation.

[0018] Preferably, the horizontal distance between the initial position of the sliding assembly and the collision tabletop is set according to the collision horizontal speed of the test vehicle and the performance parameters of the traction motor. The performance parameters of the traction motor include the traction motor speed response time and the traction motor load coefficient, and there is the following relationship specifically:

[0019] In the formula, is the horizontal distance between the initial position of the sliding assembly and the collision tabletop, is the collision horizontal speed of the test vehicle, is the traction motor speed response time, is the traction motor load coefficient.

[0020] Beneficial effects: Determining the initial position of the sliding assembly according to the performance parameters of the traction motor and the collision horizontal speed of the test vehicle in the test working condition, the sliding assembly can have sufficient acceleration time to reach the collision horizontal speed of the test vehicle required by the test working condition, ensuring the accuracy of the test.

[0021] Preferably, there is the following relationship for the starting moment of the electric cylinder:

[0022] In the formula, T is the starting moment of the electric cylinder, is the horizontal distance between the initial position of the sliding assembly and the collision tabletop, is the horizontal collision velocity of the test vehicle, and L is the length of the collision table.

[0023] Beneficial effects: By calculating the start time of the electric cylinder through the formula, comprehensively considering the horizontal distance between the initial position of the sliding component and the collision table, the horizontal collision speed of the test vehicle and other factors, it is possible to accurately control the moment when the collision table rises and collides with the test vehicle, so that the test is carried out strictly according to the preset working conditions, ensuring the accuracy and consistency of the test conditions and improving the reliability of the test results. Determining the start time of the electric cylinder with a clear mathematical relationship provides a standardized process and parameter setting basis for the test operation. The operator can conveniently set the start time of the electric cylinder according to the formula, reduce the interference of human experience factors, improve the test efficiency, and make the test process more standardized and scientific.

[0024] Preferably, the traction motor is transmission-connected to the sliding assembly via an active transmission mechanism and a driven transmission mechanism. The driven transmission mechanism includes a first transmission chain, a first transmission wheel, a first guide wheel, a second guide wheel, and a third guide wheel. The first transmission wheel, the first guide wheel, the second guide wheel, and the third guide wheel are all installed on a stand. The first transmission chain is installed on the first transmission wheel, the first guide wheel, the second guide wheel, and the third guide wheel. The first transmission wheel is transmission-connected to the active transmission mechanism, and the first transmission chain is transmission-connected to the sliding assembly.

[0025] Beneficial effects: The chain drive has an accurate transmission ratio and smooth transmission, which can ensure the stability of the sliding component during horizontal sliding, reduce the test error caused by unstable transmission, make the movement state of the test vehicle during the test more in line with expectations, and improve the accuracy of the test results. The setting of multiple guide wheels can effectively guide the movement direction of the chain, prevent the chain from running off or derailing during the transmission process, and further enhance the stability and reliability of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the test bench of the present invention; Figure 2 It is a schematic diagram of the connection between the driven transmission mechanism and the active transmission mechanism of the test bench of the present invention; Figure 3 for Figure 2 Enlarged view of point C; Figure 4 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods: Example 1 The specific implementation process is as follows: Figures 1 to 4A fixed rollover collision test method, a test bench for a rollover collision test includes a base 1, a test bench and a collision table 2 are arranged on the base 1, a sliding assembly 4 driven by a traction motor 51 is arranged on the test bench to slide horizontally in the front-rear direction on the bench, a rotating shaft 6 connected to a rotating motor 7 is arranged on the sliding assembly 4 for installing a test vehicle, and an electric cylinder is arranged at the bottom of the collision table 2 for driving the collision table 2 to rise and collide with the test vehicle. Specifically, the test bench includes a left test bench 11 and a right test bench 12, each test bench includes a front support column 81 and a rear support column 82, a guide support rod 13 is fixedly connected between the front support column 81 and the rear support column 82, and the sliding assembly 4 is slidably fitted on the guide support rod 13. Preferably, the front support columns 81 of each test bench are connected by a first reinforcing cross bar 91, and the rear support columns 82 are connected by a second reinforcing cross bar 92.

[0028] Preferably, the traction motor is connected to the sliding assembly 4 through an active transmission mechanism and a driven transmission mechanism 3, the driven transmission mechanism includes a first transmission chain 31, a first transmission wheel 32, a first guide wheel 33, a second guide wheel 34, and a third guide wheel 35, the first transmission wheel 32, the first guide wheel 33, the second guide wheel 34, and the third guide wheel 35 are all installed on the test bench, the first transmission chain 31 is installed on the first transmission wheel 32, the first guide wheel 33, the second guide wheel 34, and the third guide wheel 35, the first transmission wheel 32 is connected to the active transmission mechanism, and the first transmission chain 31 is connected to the sliding assembly. The active transmission mechanism includes a transmission shaft 53, the transmission shaft 53 is connected to the traction motor 51, and second transmission wheels 54 are arranged at both ends of the transmission shaft, and the second transmission wheels 54 are respectively meshed with the first transmission wheel 32. Further preferably, the active transmission mechanism also includes a second transmission chain 52, a third transmission wheel 56 is also provided on the transmission shaft 53, the motor shaft of the traction motor 51 is fixedly connected to a fourth transmission wheel 55, and the third transmission wheel 56 and the fourth transmission wheel 55 are connected through the second transmission chain 52.

[0029] The test method includes the following steps: S1: Determine the rollover collision test configuration parameters according to the current working condition requirements and test vehicle parameters of the rollover collision test; the working condition requirements include the test vehicle collision horizontal speed, the test vehicle collision vertical speed, and the test vehicle collision speed; the test vehicle parameters include the test vehicle mass; the rollover collision test configuration parameters include the rotation speed of the rotating motor, the horizontal distance between the initial position of the sliding component and the collision table, and the start time of the electric cylinder; the initial position of the sliding component is set by determining the horizontal distance between the initial position of the sliding component and the collision table; the start time of the electric cylinder is the time calculated from the time when the traction motor is started as 0; The horizontal distance between the initial position of the sliding assembly and the collision table is set according to the horizontal collision speed of the test vehicle and the performance parameters of the traction motor. The performance parameters of the traction motor include the speed response time of the traction motor and the load factor of the traction motor. Specifically, there is the following relationship:

[0030] In the formula, is the horizontal distance between the initial position of the sliding component and the collision table, is the horizontal collision velocity of the test vehicle, is the traction motor speed response time, is the traction motor load factor.

[0031] Since in this embodiment, the active transmission mechanism and the driven transmission mechanism of the traction motor are transmission-connected with the sliding assembly, the load coefficient of the traction motor has the following relationship:

[0032] In the formula, is the traction motor load factor, is the friction coefficient of the gear rack, is the rated torque of the traction motor, D is the major diameter of the second transmission wheel 54, is the sum of the mass load of the sliding assembly and the mass of the sliding assembly under the current working condition, and g is the gravitational acceleration. The mass load of the sliding assembly is the total mass that needs to be borne by the sliding assembly. In this embodiment, it includes the mass of the sliding assembly, the rotating shaft, and the total mass of the test vehicle. In another embodiment, the mass load of the sliding assembly also includes the mass of the connecting tooling.

[0033] The electric cylinder starting time has the following relationship:

[0034] Where, T is the start time of the electric cylinder, is the horizontal distance between the initial position of the sliding component and the collision table, is the horizontal collision speed of the test vehicle, and L is the length of the collision platform in the front-to-rear direction, which is 4m.

[0035] In this embodiment, the current working condition requires that the horizontal speed of the test vehicle during collision is 50 km / h, the vertical speed of the test vehicle during collision is 6 m / s, and the rotation speed of the test vehicle during collision is 200° / s. According to the above formula, the initial position of the sliding component is calculated to be 6 m from the horizontal distance of the collision table, and the start time of the electric cylinder is 72 ms, that is, 72 ms after the traction motor starts to start is the start time of the electric cylinder; S2: Install the test vehicle and set the initial position of the sliding component according to the rollover collision test configuration parameters; S3: Adjust the rotational speed of the rotary motor to make the rotational speed of the rotary arm reach the collision speed of the test vehicle. At the same time, start the traction motor to drive the sliding assembly, and then drive the electric cylinder according to the starting moment of the electric cylinder to raise the collision table to collide with the test vehicle, simulating the overturning collision condition of the test vehicle; S4: Collect and save the test data.

[0036] A test dummy is placed in the test vehicle. The test data includes the body information after the test and the dummy data in the test vehicle. The total mass of the test vehicle is the sum of the mass of the test vehicle itself and the mass of the dummy.

[0037] Preferably, when designing the test bench, the height difference between the sliding assembly and the collision table is set according to the vertical collision speed of the test vehicle, the parameters of the test vehicle, the mass of the collision table, and the performance parameters of the electric cylinder. The performance parameters of the electric cylinder include the load coefficient of the electric cylinder and the response time of the electric cylinder. Specifically, the following relationship exists:

[0038] In the formula, h is the height difference between the sliding assembly and the collision table, is the maximum test value of the vertical collision speed of the test vehicle, is the mass of the piston of the electric cylinder, is the mass of the collision table, is the load coefficient of the electric cylinder, is the response time of the electric cylinder, is the sum of the maximum mass load of the sliding assembly and the mass of the sliding assembly. In this embodiment, the maximum mass load of the sliding assembly includes the mass of the connecting piece, the rotating shaft, and the maximum total mass of the test vehicle allowed for the test. In other embodiments, it also includes the mass of the connecting tooling for connecting the test vehicle.

[0039] In this embodiment, the response time of the electric cylinder is 500 ms, the mass of the collision table is 1000 kg, and the mass of the piston of the electric cylinder is 250 kg. According to the overall requirements of the test, the following parameters are determined: the maximum test value of the vertical collision speed of the test vehicle is 6 m / s, and the sum of the maximum mass load of the sliding assembly and the mass of the sliding assembly is 3000 kg. According to the above formula, the height difference between the sliding assembly and the collision table should be greater than 4 m. In this embodiment, the height difference between the sliding assembly and the collision table is 4.5 m.

[0040] Embodiment 2 The test bench further includes multiple sets of connecting toolings with different sizes. The test vehicle is installed on the rotating shaft through the connecting tooling. The rotary motor is installed on the sliding assembly, and the rotating shaft is fixedly connected to the rotary motor shaft; The different sizes of the connection tooling specifically refer to the different heights of the connection tooling. By setting connection toolings with different heights, the height differences between the centroid of the test vehicle and the rotating motor shaft are made different, so as to simulate different working conditions of the rotation center of the test vehicle. In this embodiment, there are three groups of connection toolings in total, and the heights are 0, 100 mm, and 200 mm respectively.

[0041] In S1, the configuration parameters of the rollover collision test further include the size of the connection tooling, and the size of the connection tooling is determined according to the height difference between the centroid of the test vehicle and the rotating motor shaft. The rotating motor speed is determined according to the height difference between the centroid of the test vehicle and the rotating motor shaft, and the determination rule of the rotating motor speed is as follows: When the height difference between the centroid of the test vehicle and the rotating motor shaft is less than 20 mm, the rotating motor speed is the collision speed of the test vehicle. When the height difference between the centroid of the test vehicle and the rotating motor shaft is greater than or equal to 20 mm, the rotating motor speed is calculated according to the following formula.

[0042] In the formula, is the rotating motor speed, is the moment of inertia of the test vehicle body, is the height difference between the centroid of the test vehicle and the rotating motor shaft, is the sum of the mass load of the sliding component and the mass of the sliding component under the current working condition, is the collision speed of the test vehicle. The mass load of the sliding component includes the sum of the masses of the sliding component, the connection tooling, the rotating shaft, and the whole vehicle mass of the test vehicle.

[0043] In this embodiment, when calculating the traction motor load coefficient, the mass load of the sliding component includes, in addition to the masses of the sliding component, the rotating shaft, and the whole vehicle mass of the test vehicle, the mass of the connection tooling.

[0044] The above are only embodiments of the present invention. Specific structures and common knowledge such as characteristics that are well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can learn all the prior arts in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope claimed in this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A fixed-rolling collision test method, characterized in that, The test bench for rollover collision test includes a test bench and a collision table. A sliding assembly driven by a traction motor is arranged on the test bench to slide horizontally on the bench. A rotating shaft connected to a rotating motor is arranged on the sliding assembly to install the test vehicle. An electric cylinder is arranged at the bottom of the collision table to drive the collision table to rise and collide with the test vehicle. The test method includes the following steps: S1: Determine the rollover collision test configuration parameters according to the current working condition requirements and test vehicle parameters of the rollover collision test; the working condition requirements include the test vehicle collision horizontal speed, the test vehicle collision vertical speed, and the test vehicle collision speed; the test vehicle parameters include the test vehicle mass; the rollover collision test configuration parameters include the rotating motor speed, the horizontal distance between the initial position of the sliding component and the collision table, and the start time of the electric cylinder; S2: Install the test vehicle and set the initial position of the sliding component according to the rollover collision test configuration parameters; S3: Adjust the rotation speed of the rotating motor so that the rotation speed of the rotating arm reaches the collision speed of the test vehicle, and start the traction motor to drive the sliding assembly at the same time. Then drive the electric cylinder according to the start time of the electric cylinder to raise the collision table and collide with the test vehicle, simulating the test vehicle rollover collision condition; S4: Collect and save test data.

2. The fixed-roll collision test method according to claim 1, wherein: The height difference between the sliding assembly and the collision table is set according to the vertical collision speed of the test vehicle, the test vehicle parameters, the mass of the collision table, and the performance parameters of the electric cylinder. The performance parameters of the electric cylinder include the load factor of the electric cylinder and the response time of the electric cylinder. Specifically, there is the following relationship: where h is the height difference between the sliding component and the collision tabletop, is the maximum test value of the vertical collision speed of the test vehicle, is the mass of the electric cylinder piston, is the mass of the collision tabletop, is the load coefficient of the electric cylinder, is the response time of the electric cylinder, is the sum of the maximum mass load of the sliding component and the mass of the sliding component.

3. The fixed-rolling collision test method according to claim 1, characterized in that: The test bench also includes multiple groups of connecting fixtures of different sizes. The test vehicle is installed on the rotating shaft through the connecting fixtures, the rotating motor is installed on the sliding assembly, and the rotating shaft is fixedly connected to the rotating motor shaft. In S1, the rollover collision test configuration parameters also include the size of the connecting fixture, and the size of the connecting fixture is determined according to the height difference between the center of mass of the test vehicle and the rotating motor shaft.

4. The fixed-rollover collision test method according to claim 3, characterized in that: The rotating motor speed is determined according to the height difference between the center of mass of the test vehicle and the rotating motor shaft. The rotating motor speed determination rule is as follows: When the height difference between the center of mass of the test vehicle and the shaft of the rotating motor is less than 20 mm, the rotating motor speed is the collision speed of the test vehicle; When the height difference between the center of mass of the test vehicle and the shaft of the rotating motor is greater than or equal to 20 mm, the rotating motor speed is calculated according to the following formula: In the formula, is the rotational speed of the rotating motor, is the moment of inertia of the test vehicle body, is the height difference between the center of mass of the test vehicle and the axis of the rotating motor, is the sum of the mass load of the sliding component and the mass of the sliding component under the current working condition, is the collision rotational speed of the test vehicle, and the mass load of the sliding component includes the sum of the masses of the sliding component, the connecting tooling, the rotating shaft, and the entire vehicle mass of the test vehicle.

5. The fixed-rollover collision test method according to claim 1, characterized in that: The horizontal distance between the initial position of the sliding assembly and the collision table is set according to the horizontal collision speed of the test vehicle and the performance parameters of the traction motor. The performance parameters of the traction motor include the speed response time of the traction motor and the load factor of the traction motor. Specifically, there is the following relationship: In the formula, is the horizontal distance between the initial position of the sliding component and the collision tabletop, is the horizontal collision speed of the test vehicle, is the speed response time of the traction motor, is the load coefficient of the traction motor.

6. The fixed-rollover collision test method according to claim 1, characterized in that: The electric cylinder starting time has the following relationship: where T is the starting moment of the electric cylinder, is the horizontal distance between the initial position of the sliding component and the collision tabletop, is the horizontal collision speed of the test vehicle, and L is the length of the collision tabletop.

7. The fixed-rolling collision test method according to claim 1, wherein: The traction motor is connected to the sliding assembly through the active transmission mechanism and the driven transmission mechanism. The driven transmission mechanism includes a first transmission chain, a first transmission wheel, a first guide wheel, a second guide wheel, and a third guide wheel. The first transmission wheel, the first guide wheel, the second guide wheel, and the third guide wheel are all installed on the bench. The first transmission chain is installed on the first transmission wheel, the first guide wheel, the second guide wheel, and the third guide wheel. The first transmission wheel is in transmission connection with the driving transmission mechanism, and the first transmission chain is in transmission connection with the sliding assembly.

8. The fixed-rollover collision test method according to claim 7, wherein: The driving transmission mechanism includes a transmission shaft, the transmission shaft is power-connected to a traction motor, second transmission wheels are arranged at both ends of the transmission shaft, and the second transmission wheels are respectively meshed with the first transmission wheels.

Images