A road noise structure sound problem diagnosis and scheme verification method based on wheel transfer function

Abstract

The present application belongs to the technical field of road noise structure sound diagnosis, and specifically discloses a road noise structure sound problem diagnosis and scheme verification method based on wheel transfer function, which comprises the following steps: S1: performing a road noise preliminary investigation test on a target vehicle, and determining a problem frequency according to a test result; S2: determining front and rear wheel contributions of the problem frequency; S3: selecting an excitation point on a main contribution wheel; S4: comparing vibrations of a steering knuckle and in-vehicle noise under wheel knocking and road noise tests, and judging a trend of a frequency band of interest; S5: after the wheel knocking point is selected, a resonance position is found; S6: the resonance position is changed to change vibration characteristics, and knocking is used to verify vibration and in-vehicle noise changes; S7: vibrations and in-vehicle noise before and after a scheme are viewed, whether in-vehicle noise is reduced or a frequency is shifted is viewed, if yes, the scheme is retained to perform a road test verification, and if not, the resonance position is re-found; the present application can perform road noise problem diagnosis and scheme verification in a vehicle stationary state, work efficiency is improved, and capital investment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of road noise and structure-borne sound diagnosis, and in particular to a method for diagnosing road noise and structure-borne sound problems and verifying solutions based on wheel transfer functions. Background Art

[0002] Road noise and structure-borne sound diagnosis and verification are typically performed through road testing. Common diagnostic methods include transfer path analysis (TPA), operating deformation analysis (ODS), and modal analysis. To ensure test accuracy, a single road test typically requires three or more data sets and an average. In practice, multiple solutions often require verification of improvement effects for problematic frequency bands of road noise and structure-borne sound, resulting in lengthy testing times. Alternatively, road noise testing can be performed using a rotating wheel, which requires significant equipment and capital investment. Therefore, a method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transfer function is proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for diagnosing road noise and structure-borne sound problems and verifying solutions based on wheel transfer function, so as to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function, comprising the following steps:

[0005] S1: Conduct a road noise baseline test on the target vehicle to obtain at least interior noise and front and rear wheel steering knuckle vibration data, and determine the problem frequency based on the test results;

[0006] S2: Determine the front and rear wheel contributions to the problem frequency through methods such as POA, tire pressure adjustment, and tire replacement;

[0007] S3: Select an excitation point on the wheel that contributes the most, strike it with a hammer, and monitor the steering knuckle vibration response and interior noise response;

[0008] S4: Compare the steering knuckle vibration and interior noise during the wheel tapping and road noise tests to determine the trend of the frequency band of interest. If the trends are consistent, select the tapping location. If the trends are inconsistent, adjust the tapping location until a consistent trend is found.

[0009] S5: After the wheel striking point is selected, vibration sensors are placed on key parts such as the chassis and body to find the resonance position;

[0010] S6: Change the vibration characteristics of the resonance position and tap to verify the changes in vibration and noise inside the vehicle;

[0011] S7: Check the front and rear vibrations and the noise inside the car. If the vibration at the solution position does not change much, readjust the solution until the vibration changes significantly. Then check whether the noise inside the car decreases or the frequency shifts. If so, retain the solution and conduct a road test to verify it. If not, re-find the resonance position.

[0012] As a preferred technical solution of the present invention, the problem frequency is determined by comparing the in-vehicle noise curve with the target value curve.

[0013] As a preferred technical solution of the present invention, the POA refers to the correlation characteristics between the sound pressure inside the vehicle and the acceleration vibration of the steering knuckle.

[0014] As a preferred technical solution of the present invention, in S3 , the vibration response of the steering knuckle is monitored by an acceleration sensor.

[0015] As a preferred technical solution of the present invention, in S3, the noise response inside the vehicle is monitored by a microphone.

[0016] As a preferred technical solution of the present invention, the method of changing the vibration characteristics of S6 includes adjusting and strengthening the counterweight, vibration absorber, and bushing.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The method for diagnosing and verifying road noise and structure-borne sound problems provided by the present invention has the following specific operation procedures: conducting a road noise test on the target vehicle and determining the problem frequency based on the test results; determining the front and rear wheel contributions to the problem frequency through methods such as POA, adjusting tire pressure, and changing tires; selecting an excitation point on the wheel that makes the main contribution, striking it with a hammer, and monitoring the vibration response of the steering knuckle and the noise response inside the vehicle; comparing the vibration of the steering knuckle and the noise inside the vehicle under the wheel striking and road noise tests, and determining the trend of the frequency band of interest; if the trends of the two are consistent, selecting the striking position; if the trends are inconsistent, adjusting the striking position until a point with consistent trends is found; after the wheel striking point is selected, the chassis and body are tested. Arrange vibration sensors at key locations such as the front and rear of the vehicle to find the resonance position; change the vibration characteristics of the resonance position, and tap to verify the changes in vibration and noise inside the vehicle; check the vibration before and after the solution and the noise inside the vehicle; if the vibration at the solution position does not change much, readjust the solution until the vibration changes significantly, and then check whether the noise inside the vehicle decreases or the frequency shifts; if so, retain the solution for road test verification; otherwise, find the resonance position again; the method for diagnosing road noise and structure-borne sound problems and verifying solutions provided by the present invention can perform road noise problem diagnosis and solution verification when the vehicle is stationary, is simple to operate, greatly improves work efficiency compared to road tests, and can significantly reduce capital investment compared to rotating hub tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1The present invention provides a flowchart of a method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a technical solution: a method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function, comprising the following steps:

[0022] S1: Conduct a road noise baseline test on the target vehicle to obtain at least interior noise and front and rear wheel steering knuckle vibration data. Determine the problem frequency based on the test results. The problem frequency can be determined by comparing the interior noise curve with the target value curve.

[0023] S2: Determine the front and rear wheel contributions to the problem frequency through methods such as POA (correlation between interior sound pressure and steering knuckle acceleration vibration), adjusting tire pressure, and changing tires.

[0024] S3: Select an excitation point on the wheel that contributes the most to the vibration and hit it with a hammer. The vibration response of the steering knuckle is monitored by an accelerometer, and the noise response inside the vehicle is monitored by a microphone.

[0025] S4: Compare the steering knuckle vibration and interior noise during the wheel tapping and road noise tests to determine the trend of the frequency band of interest. If the trends are consistent, select the tapping location. If the trends are inconsistent, adjust the tapping location until a consistent trend is found.

[0026] S5: After the wheel striking point is selected, vibration sensors are placed on key parts such as the chassis and body to find the resonance position;

[0027] S6: Change the vibration characteristics of the resonance position by adjusting the weight, vibration absorber, bushing, and strengthening the light, and knock to verify the changes in vibration and noise inside the car;

[0028] S7: Check the front and rear vibrations and the noise inside the car. If the vibration at the solution position does not change much, readjust the solution until the vibration changes significantly. Then check whether the noise inside the car decreases or the frequency shifts. If so, retain the solution and conduct a road test to verify it. If not, re-find the resonance position.

[0029] The method for diagnosing road noise and structure-borne sound problems and verifying solutions provided by the present invention can perform road noise problem diagnosis and solution verification when the vehicle is stationary. The operation is simple, and compared with road tests, work efficiency is greatly improved, and compared with rotating hub tests, capital investment can be greatly reduced.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function, characterized in that: The following steps are involved: S1: Conduct a road noise baseline test on the target vehicle to obtain at least interior noise and front and rear wheel steering knuckle vibration data, and determine the problem frequency based on the test results; S2: Determine the front and rear wheel contributions to the problem frequency through POA, tire pressure adjustment, and tire replacement methods; The POA refers to the correlation between the in-vehicle sound pressure and the steering knuckle acceleration vibration; S3: Select an excitation point on the wheel that contributes the most, strike it with a hammer, and monitor the steering knuckle vibration response and interior noise response; S4: Compare the steering knuckle vibration and interior noise during the wheel tapping and road noise tests to determine the trend of the frequency band of interest. If the trends are consistent, select the tapping location. If the trends are inconsistent, adjust the tapping location until a consistent trend is found. S5: After the wheel striking point is selected, vibration sensors are placed on key parts of the chassis and body to find the resonance position; S6: Change the vibration characteristics of the resonance position and tap to verify the changes in vibration and noise inside the vehicle; S7: Check the front and rear vibrations and the noise inside the car. If the vibration at the solution position does not change much, readjust the solution until the vibration changes significantly. Then check whether the noise inside the car decreases or the frequency shifts. If so, retain the solution and conduct a road test to verify it. If not, re-find the resonance position.

2. The method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function according to claim 1, characterized in that: The problem frequency is determined by comparing the in-vehicle noise curve with the target value curve.

3. The method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function according to claim 1, characterized in that: In S3 , the vibration response of the steering knuckle is monitored by an acceleration sensor.

4. The method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function according to claim 1, characterized in that: In S3 , the noise response inside the vehicle is monitored by a microphone.

5. The method for diagnosing and verifying road noise and structure-borne sound problems based on wheel transmission function according to claim 1, characterized in that: The methods for changing the vibration characteristics of the S6 include counterweights, vibration absorbers, bushing adjustments, and reinforcements.

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