Vehicle offset frequency test method, device and equipment and storage medium

Abstract

The invention relates to the technical field of vehicle testing, and provides a vehicle offset frequency testing method, device and equipment and a storage medium. The method comprises the following steps: acquiring a driving video of a to-be-tested vehicle driving over a deceleration strip; according to the driving video, a vertical direction vibration attenuation curve corresponding to a target detection position on the to-be-tested vehicle is obtained, and the vertical direction vibration attenuation curve is a curve describing the vibration amplitude of the target detection position in the vertical direction along with time change; according to the vertical direction vibration attenuation curve corresponding to the target detection position, the attenuation frequency corresponding to the target detection position is calculated, and the offset frequency of the to-be-tested vehicle is obtained. According to the invention, the offset frequency test efficiency of the vehicle can be effectively improved, the requirements for the test scene and the specialty of test personnel are low, and the test time is effectively shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and in particular, to a method, device, equipment and storage medium for the off-frequency test of a vehicle. Background Art

[0002] At present, for the polarization test of a vehicle, it is generally carried out in a professional vehicle NVH laboratory. A large number of vibration sensors need to be arranged on the vehicle body and chassis, and vibration excitation is carried out through an exciter to complete the test.

[0003] For the existing vehicle polarization test method, on the one hand, the current vehicle polarization test method is relatively cumbersome and the test efficiency is low. Generally, it takes 1 to 2 days to complete this test, which is time-consuming; on the other hand, the current vehicle polarization test method has high requirements for the professionalism of the test personnel, and multiple test personnel are required to complete the test together. Generally, 2 to 3 professional NVH test personnel are required to complete this test. Therefore, the current vehicle polarization test method has high requirements for human and material resources and low test efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method, device, equipment and storage medium for the off-frequency test of a vehicle to solve the above technical problems.

[0005] The technical solution of the present invention for solving the above technical problems is as follows: An off-frequency test method for a vehicle includes: obtaining a driving video of a to-be-tested vehicle passing over a speed bump; according to the driving video, obtaining a vertical direction vibration attenuation curve corresponding to a target detection position on the to-be-tested vehicle, where the vertical direction vibration attenuation curve is a curve describing the change of the vibration amplitude of the target detection position in the vertical direction over time; and calculating an attenuation frequency corresponding to the target detection position according to the vertical direction vibration attenuation curve corresponding to the target detection position to obtain the off-frequency of the to-be-tested vehicle.

[0006] The beneficial effect of the present invention is that by obtaining a driving video of a to-be-tested vehicle passing over a speed bump and then analyzing the vibration of the target detection position according to the driving video, the off-frequency of the to-be-tested vehicle can be quickly obtained. Through this method, the off-frequency test efficiency of the vehicle can be effectively improved, and the requirements for the test scenario and the professionalism of the test personnel are low. The test that originally took 1 to 2 days can be shortened to 2 to 3 hours.

[0007] On the basis of the above technical solution, the present invention can be further improved as follows.

[0008] Further, the target detection position includes at least one of the front wheels, rear wheels and vehicle body of the to-be-tested vehicle.

[0009] Further, obtaining the vertical vibration attenuation curve corresponding to the target detection position on the vehicle to be tested according to the driving video includes: obtaining a vertical position change sequence corresponding to the target detection position after the vehicle to be tested passes over a speed bump according to the driving video, where the vertical position change sequence represents a series of data points of the position of the target detection position in the vertical direction changing with time; generating the vertical vibration attenuation curve corresponding to the target detection position according to the vertical position change sequence.

[0010] Further, calculating the attenuation frequency corresponding to the target detection position according to the vertical vibration attenuation curve corresponding to the target detection position includes: respectively obtaining a first time corresponding to the first peak of the vertical vibration attenuation curve and a second time corresponding to the second peak of the vertical vibration attenuation curve according to the vertical vibration attenuation curve corresponding to the target detection position; calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time.

[0011] Further, calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time includes: calculating the attenuation frequency corresponding to the target detection position through a first formula according to the first time and the second time, where the first formula is:

[0012] f = 1 / (t1 - t2);

[0013] where f is the attenuation frequency, t1 is the first time, and t2 is the second time.

[0014] Further, the process of the vehicle to be tested passing over a speed bump includes: the process in which the vehicle to be tested enters the field of view of a camera for obtaining the driving video, passes over the speed bump, generates free vibration after passing over the speed bump, and until it leaves the field of view of the camera.

[0015] To solve the above technical problems, the present invention also proposes a vehicle partial frequency test device, including:

[0016] A video acquisition module, configured to acquire a driving video of the process of the vehicle to be tested passing over a speed bump;

[0017] A curve acquisition module, configured to obtain a vertical vibration attenuation curve corresponding to a target detection position on the vehicle to be tested according to the driving video, where the vertical vibration attenuation curve is a curve describing the change of the vibration amplitude of the target detection position in the vertical direction with time;

[0018] A deviation frequency calculation module, configured to calculate a decay frequency corresponding to the target detection position according to a vertical vibration decay curve corresponding to the target detection position, so as to obtain the deviation frequency of the vehicle to be tested.

[0019] Further, the target detection positions include at least one of the front wheels, rear wheels, and body of the vehicle to be tested.

[0020] To solve the above technical problems, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements a deviation frequency test method for a vehicle as described above.

[0021] To solve the above technical problems, the present invention also provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a computer to execute a deviation frequency test method for a vehicle as described above. Description of the Drawings

[0022] Figure 1 It is a flowchart of a deviation frequency test method for a vehicle according to the present invention;

[0023] Figure 2 It is a schematic diagram of a vertical vibration decay curve of a deviation frequency test method for a vehicle according to the present invention;

[0024] Figure 3 It is a schematic diagram of a deviation frequency test device for a vehicle according to the present invention. Detailed Embodiments

[0025] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0026] Embodiment 1

[0027] As Figure 1 shown, this embodiment provides a deviation frequency test method for a vehicle, including:

[0028] S101. Obtain a driving video of the vehicle to be tested during the process of driving over a speed bump.

[0029] Optionally, in the embodiment, the process of the vehicle to be tested driving over the speed bump includes: the process that the vehicle to be tested enters the field of view of the camera for obtaining the driving video, drives over the speed bump, generates free vibration after passing the speed bump, and until it drives out of the field of view of the camera.

[0030] Specifically, a driver is required to drive the vehicle to be tested at a constant speed of 5 km / h or no higher than 10 km / h over the speed bump on the smooth road surface. Another staff member takes a video of the vehicle to be tested passing over the speed bump on one side of the vehicle to be tested through a camera. The vertical distance between the camera and the side of the vehicle to be tested does not exceed ten meters, and the complete process of the vehicle to be tested passing over the speed bump is recorded through the camera.

[0031] S102. Obtain the vertical direction vibration attenuation curve corresponding to the target detection position on the vehicle to be tested according to the driving video. The vertical direction vibration attenuation curve is a curve describing the change of the vibration amplitude of the target detection position in the vertical direction over time. The vertical direction refers to the direction perpendicular to the driving plane of the vehicle to be tested, that is, the up and down direction of the vehicle body of the vehicle to be tested.

[0032] Optionally, in the embodiment, the target detection position includes at least one of the front wheels, rear wheels, and body of the vehicle to be tested.

[0033] Specifically, the target detection positions are set at the midpoint of the front wheel center, the midpoint of the rear wheel center, and the middle position of the body of the vehicle to be tested (as close as possible to the middle position of the body). When the middle position of the body is selected as the target detection position, a reference point can be selected on the body according to the actual situation of the vehicle to be tested, and this position can also be marked on the body with a marker pen or the like before the test for subsequent vibration analysis.

[0034] Optionally, in the embodiment, the obtaining the vertical direction vibration attenuation curve corresponding to the target detection position on the vehicle to be tested according to the driving video includes: obtaining a vertical direction position change sequence of the target detection position after passing over the speed bump according to the driving video, where the vertical direction position change sequence represents a series of data points of the position of the target detection position in the vertical direction changing over time; generating the vertical direction vibration attenuation curve corresponding to the target detection position according to the vertical direction position change sequence.

[0035] According to the driving video, capture the position change of the target detection position in the vertical direction to obtain the vertical direction position change sequence, and then generate the vertical direction vibration attenuation curve corresponding to the target detection position.

[0036] S103. Calculate the attenuation frequency corresponding to the target detection position according to the vertical direction vibration attenuation curve corresponding to the target detection position to obtain the partial frequency of the vehicle to be tested.

[0037] Optionally, in an embodiment, calculating the attenuation frequency corresponding to the target detection position according to the vertical direction vibration attenuation curve corresponding to the target detection position includes: obtaining, according to the vertical direction vibration attenuation curve corresponding to the target detection position, a first time corresponding to a first peak of the vertical direction vibration attenuation curve and a second time corresponding to a second peak of the vertical direction vibration attenuation curve; and calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time.

[0038] Optionally, in an embodiment, calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time includes:

[0039] Calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time by a first formula, where the first formula is:

[0040] f = 1 / (t1 - t2);

[0041] where f is the attenuation frequency, t1 is the first time, and t2 is the second time.

[0042] As Figure 2 shown, for the vertical direction vibration attenuation curve corresponding to the target detection position, the time corresponding to the first peak position of the curve is the first time t1, and the time corresponding to the second peak position of the curve is the second time t2.

[0043] When the target detection position is the midpoint of the front wheel center, the calculated attenuation frequency is the front suspension frequency of the vehicle to be tested; when the target detection position is the midpoint of the rear wheel center, the calculated attenuation frequency is the rear suspension frequency of the vehicle to be tested; when the target detection position is the middle position of the vehicle body, the calculated attenuation frequency is the body natural frequency of the vehicle to be tested.

[0044] By acquiring the driving video of the vehicle to be tested passing over a speed bump and then analyzing the vibration of the target detection position according to the driving video, this method can quickly obtain the natural frequency of the vehicle to be tested. This method only needs to be carried out on the roadside with a speed bump or on the internal road of a factory, without the need for a professional NVH laboratory, and saves equipment such as sensors and exciters. The professional requirements for testers are low. It only requires the tester to drive the vehicle through the speed bump and shoot the video, and can shorten the original test that takes 1 to 2 days to 2 to 3 hours, effectively improving the test efficiency.

[0045] Embodiment 2

[0046] As Figure 3 shown, this embodiment provides a vehicle natural frequency testing device 200, including:

[0047] A video acquisition module 201, configured to acquire a driving video of a vehicle to be tested during the process of passing over a speed bump;

[0048] A curve acquisition module 202, configured to acquire a vertical vibration attenuation curve corresponding to a target detection position on the vehicle to be tested according to the driving video, where the vertical vibration attenuation curve is a curve describing the change of the vibration amplitude of the target detection position in the vertical direction over time;

[0049] An offset frequency calculation module 203, configured to calculate the attenuation frequency corresponding to the target detection position according to the vertical vibration attenuation curve corresponding to the target detection position, and obtain the offset frequency of the vehicle to be tested.

[0050] Optionally, in the embodiment, the target detection position includes at least one of the front wheels, rear wheels, and body of the vehicle to be tested.

[0051] Optionally, in the embodiment, the curve acquisition module 202 includes:

[0052] A position acquisition unit, configured to acquire a vertical position change sequence of the target detection position after passing over the speed bump according to the driving video, where the vertical position change sequence represents a series of data points of the position of the target detection position in the vertical direction changing over time;

[0053] A curve generation unit, configured to generate a vertical vibration attenuation curve corresponding to the target detection position according to the vertical position change sequence.

[0054] Optionally, in the embodiment, the offset frequency calculation module 203 includes:

[0055] A time acquisition unit, configured to respectively acquire a first time corresponding to the first peak of the vertical vibration attenuation curve and a second time corresponding to the second peak of the vertical vibration attenuation curve according to the vertical vibration attenuation curve corresponding to the target detection position;

[0056] A frequency calculation unit, configured to calculate the attenuation frequency corresponding to the target detection position according to the first time and the second time.

[0057] Optionally, in the embodiment, the calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time includes:

[0058] Calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time through a first formula, where the first formula is:

[0059] f = 1 / (t1 - t2);

[0060] Wherein, f is the attenuation frequency, t1 is the first time, and t2 is the second time.

[0061] Optionally, in the embodiment, the process of the vehicle to be tested passing over the speed bump includes: the vehicle to be tested enters the field of view of the camera for acquiring the driving video, passes over the speed bump, generates free vibration after passing over the speed bump, and until it drives out of the field of view of the camera.

[0062] Embodiment III

[0063] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements a method for testing the partial frequency of a vehicle as described in Embodiment I.

[0064] Embodiment IV

[0065] This embodiment provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a computer to execute a method for testing the partial frequency of a vehicle as described in Embodiment I.

[0066] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for measuring the partial frequency of a vehicle, characterized in that, Including: Obtain a driving video of the vehicle to be tested during the process of passing over a speed bump; According to the driving video, obtain a vertical vibration attenuation curve corresponding to a target detection position on the vehicle to be tested, where the vertical vibration attenuation curve is a curve describing the change in the vibration amplitude of the target detection position in the vertical direction over time; According to the vertical vibration attenuation curve corresponding to the target detection position, calculate the attenuation frequency corresponding to the target detection position to obtain the natural frequency of the vehicle to be tested.

2. The off-frequency test method for a vehicle according to claim 1, wherein The target detection position includes at least one of the front wheels, rear wheels, and body of the vehicle to be tested.

3. The off-frequency test method for a vehicle according to claim 1, wherein The step of obtaining a vertical vibration attenuation curve corresponding to a target detection position on the vehicle to be tested according to the driving video includes: According to the driving video, obtain a sequence of vertical position changes of the target detection position after passing over the speed bump, where the sequence of vertical position changes represents a series of data points of the position of the target detection position in the vertical direction changing over time; Generate a vertical vibration attenuation curve corresponding to the target detection position according to the sequence of vertical position changes.

4. The off-frequency test method of a vehicle according to claim 1, wherein The step of calculating the attenuation frequency corresponding to the target detection position according to the vertical vibration attenuation curve corresponding to the target detection position includes: According to the vertical vibration attenuation curve corresponding to the target detection position, respectively obtain the first time corresponding to the first peak of the vertical vibration attenuation curve and the second time corresponding to the second peak of the vertical vibration attenuation curve; Calculate the attenuation frequency corresponding to the target detection position according to the first time and the second time.

5. The off-frequency test method of a vehicle according to claim 4, wherein The step of calculating the attenuation frequency corresponding to the target detection position according to the first time and the second time includes: Calculate the attenuation frequency corresponding to the target detection position through a first formula according to the first time and the second time, where the first formula is: f = 1 / (t1 - t2); where f is the attenuation frequency, t1 is the first time, and t2 is the second time.

6. The off-frequency test method for a vehicle according to claim 1, wherein The process of the vehicle to be tested passing over the speed bump includes: the process in which the vehicle to be tested enters the field of view of the camera for obtaining the driving video, passes over the speed bump, generates free vibration after passing over the speed bump, and until it leaves the field of view of the camera.

7. A deviation frequency test device for a vehicle, characterized in that, Including: A video acquisition module for obtaining a driving video of the vehicle to be tested during the process of passing over a speed bump; A curve acquisition module for obtaining a vertical vibration attenuation curve corresponding to a target detection position on the vehicle to be tested according to the driving video, where the vertical vibration attenuation curve is a curve describing the change in the vibration amplitude of the target detection position in the vertical direction over time; A natural frequency calculation module for calculating the attenuation frequency corresponding to the target detection position according to the vertical vibration attenuation curve corresponding to the target detection position to obtain the natural frequency of the vehicle to be tested.

8. The off-frequency test device for a vehicle according to claim 7, characterized in that The target detection position includes at least one of the front wheels, rear wheels, and body of the vehicle to be tested.

9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements a method for testing the offset frequency of a vehicle as described in any one of claims 1 to 6.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause a computer to execute a method for testing the offset frequency of a vehicle as described in any one of claims 1 to 6.

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