Fan stand noise testing method and testing device

Abstract

The invention relates to a fan rack noise testing method and testing device. A fan rack comprises a resistance plate, an active air inlet grille, a cooling module and a fan. The fan bench noise test method comprises the steps of adjusting the back pressure of a resistance plate to the whole vehicle system resistance corresponding to the target demand air volume; wherein the resistance plate is located on the side, away from the cooling module, of the active air inlet grille, and noise testing is conducted on the basis of noise parameters in the fan speed increasing process. The test result can reflect the order characteristics of the fan on the whole vehicle, and the test result is more accurate, so that the fan rack can be optimized according to the order characteristics of the fan, and the development time and the development cost are reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fan testing, and in particular to a fan bench noise testing method and a testing device. Background Art

[0002] With the rise of the domestic new energy vehicle industry, the automobile development cycle is getting shorter and shorter. For example, in the early stages of development and tuning of fan noise, bench tests are used to identify risks.

[0003] However, the technicians found that the noise characteristics of the test bench and the whole vehicle are very different. Often, after the test bench noise meets the requirements, the calibration results are applied to the whole vehicle, but the fan BPF (Blade Pass Frequency) noise of the whole vehicle cannot meet the user's needs and needs to be adjusted on the whole vehicle. This results in the fan being found to have noise that does not meet the requirements after the mold is opened, and many optimization plans and repeated mold repairs are required later, which may even affect the progress of project development. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a fan bench noise testing method and a testing device.

[0005] In a first aspect, the present disclosure provides a fan stand noise testing method, wherein the fan stand includes a resistance plate, an active air intake grille, a cooling module, and a fan; the method includes:

[0006] Adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume; wherein the resistance plate is located on the side of the active air intake grille away from the cooling module;

[0007] A noise test is performed based on the noise parameters of the fan speed-up process.

[0008] In some embodiments, adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume includes:

[0009] Assembling the cooling module and the active air intake grille on an air volume table;

[0010] Adjust the air volume of the air volume table to the target required air volume, and set a resistance plate on the side of the active air intake grille away from the cooling module, and adjust the back pressure of the resistance plate until the back pressure reaches the system resistance corresponding to the target required air volume;

[0011] The cooling module, the active air intake grille and the resistance plate are assembled on the fan stand according to the positional relationship calibrated on the air volume table.

[0012] In some embodiments, it also includes:

[0013] Determine the corresponding relationship between the air volume and the resistance based on the CFD model simulation;

[0014] Determine the vehicle system resistance corresponding to the target required air volume based on the corresponding relationship between the air volume and the resistance.

[0015] In some embodiments, adjusting the back pressure of the resistance plate includes:

[0016] Adjust the back pressure of the resistance plate by controlling the opening area of the resistance plate.

[0017] In some embodiments, before performing the noise test based on the noise parameters during the fan speed increase process, it includes:

[0018] Control the fan test bench to simulate the vehicle running state.

[0019] In some embodiments, the noise test based on the noise parameters during the fan speed increase process includes:

[0020] Obtain the overall sound pressure level curve of the noise during the fan speed increase process and the order noise curve of the fan blades;

[0021] Based on the decibel difference between the peak of the order noise curve and the corresponding overall sound pressure level curve being less than a preset difference, determine the peak point of the order noise curve to be optimized.

[0022] In some embodiments, after determining the peak point of the order noise curve to be optimized, it further includes:

[0023] Optimize the fan test bench until the decibel difference between the peak of the order noise curve and the corresponding overall sound pressure level curve is greater than the preset difference.

[0024] In some embodiments, before determining the peak point of the order noise curve to be optimized based on the decibel difference between the peak of the order noise curve and the corresponding overall sound pressure level curve being less than a preset difference, it further includes:

[0025] Based on the corresponding position relationship between the peak of the overall sound pressure level curve of the fan test bench noise test and the peak of the overall sound pressure level curve of the vehicle noise test, and combining the decibel difference between the peak of the overall sound pressure level curve of the fan test bench noise test and the corresponding overall sound pressure level curve, determine the preset difference.

[0026] In a second aspect, the present disclosure further includes a fan test bench noise test device, and the device includes: a control module and a fan test bench;

[0027] The fan stand at least comprises the resistance plate, the active air intake grille, the cooling module and the fan; the fan is fixedly arranged on the support frame; the cooling module is located at the air outlet side of the fan; the active air intake grille is located at the side of the cooling module away from the fan; the resistance plate is located at the side of the active air intake grille away from the cooling module;

[0028] The control module is electrically connected to the fan stand and is used to control the fan stand to perform noise testing.

[0029] In some embodiments, the resistance plate includes a plurality of openings; the openings are evenly and symmetrically distributed on the resistance plate.

[0030] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0031] In the fan bench noise test method provided by the present disclosure, the fan bench includes a resistance plate, an active air intake grille, a cooling module and a fan, and the back pressure of the resistance plate is adjusted to the whole vehicle system resistance corresponding to the target required air volume; the noise test is performed based on the noise parameters of the fan speed increase process; wherein, the fan bench includes a resistance plate, an active air intake grille, a cooling module and a fan; the resistance plate is located on the side of the active air intake grille away from the cooling module. Thus, the whole vehicle system resistance corresponding to the target required air volume is simulated by the resistance plate to form a more realistic test environment, obtain accurate noise parameters, and then analyze and optimize the noise parameters. The test results disclosed in the present disclosure can reflect the fan order characteristics on the whole vehicle, and the test results are more accurate, so the fan bench can be optimized according to the fan order characteristics to reduce development time and development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 A schematic diagram of a flow chart of a fan bench noise testing method provided in an embodiment of the present disclosure;

[0035] Figure 2 A noise diagram of a fan stand provided with a resistance plate is provided in an embodiment of the present disclosure;

[0036] Figure 3A noise diagram of a fan stand provided with no resistance plate provided in an embodiment of the present disclosure;

[0037] Figure 4 A whole vehicle test noise diagram provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0040] Most of the current new energy vehicle cooling systems have added active air intake grilles, and with the development of technologies such as supercharging, the demand for automotive thermal management and heat dissipation continues to increase, and the demand for fan air volume continues to increase, which brings many problems to fan noise. For example, the fan will produce obvious BPF noise at high speed and high back pressure. However, when testing on the fan bench, it is impossible to reflect the fan order characteristics on the whole vehicle, and the test results are inaccurate. As a result, after the calibration results obtained from the test are applied to the whole vehicle, the fan BPF noise of the whole vehicle cannot meet user needs, and it needs to continue to be adjusted on the whole vehicle, resulting in a longer development process, which may even affect the progress of project development and increase the development cost of the fan and the whole vehicle.

[0041] In order to solve the above problems, an embodiment of the present disclosure provides a fan stand noise testing method, which can be performed by a fan stand noise testing device provided by an embodiment of the present disclosure. The testing device includes a fan stand, and the fan stand includes a resistance plate, an active air intake grille, a cooling module and a fan. Figure 1 A flow chart of a fan stand noise testing method provided by an embodiment of the present disclosure, referring to Figure 1 , fan bench noise test methods include S110-S120:

[0042] S110, adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume, wherein the resistance plate is located on the side of the active air intake grille away from the cooling module.

[0043] In the prior art, the reason for the inaccurate fan bench test is that the vehicle state cannot be accurately and realistically simulated during the test. The resistance factor is not considered in the fan bench test of the prior art. Therefore, the test result cannot reflect the fan order characteristics of the vehicle, and it is even more impossible to optimize the fan bench according to the fan order characteristics. Based on this, a resistance plate is introduced in the embodiments of the present disclosure to simulate the vehicle system resistance with the resistance plate. In addition, there is a corresponding relationship between the vehicle system resistance and the air volume. Therefore, the back pressure of the resistance plate is adjusted to the vehicle system resistance corresponding to the target required air volume, so as to more realistically simulate the vehicle when testing on the fan bench.

[0044] Among them, during the test, the back pressure of the resistance plate can simulate the actual vehicle system resistance. For example, the noise test is carried out on a fan bench. The fan bench includes a resistance plate with the back pressure adjusted to the vehicle system resistance corresponding to the target required air volume, an active intake grille, a cooling module, and a fan. The fan is assembled at a fixed position. The cooling module is located on the air outlet side of the fan. The active intake grille is located on the side of the cooling module away from the fan. The resistance plate is located on the side of the active intake grille away from the cooling module to simulate the positional relationship of each structure in the vehicle. The fan operates to provide the air volume required for the test, and the cooling module can be a radiator. After the fan starts, the generated air flow flows outwards through the cooling module, the active intake grille, and the resistance plate in sequence. The air volume reaches the resistance plate through the cooling module and the active intake grille. During the air flow process, it is blocked by the windward surface of the resistance plate and generates a certain pressure, and a specific pressure will also be generated on the leeward surface of the resistance plate, which is the back pressure of the resistance plate. By making the back pressure value match the vehicle system resistance, when testing on the fan bench, the fan is like operating in a real vehicle environment, and the resistance conditions faced are the same as the actual situation. Therefore, the back pressure of the resistance plate can be adjusted to the vehicle system resistance corresponding to the target required air volume. The target required air volume refers to the output air volume that the fan finally needs to reach when performing the fan bench test. For example, if the target required air volume is the maximum air volume required by the vehicle, then at this time, the vehicle system resistance of the vehicle also corresponds to the maximum air volume, and the back pressure of the resistance plate should be adjusted to the vehicle system resistance corresponding to the maximum air volume to improve the accuracy and authenticity of the simulation.

[0045] S120. Perform a noise test based on the noise parameters during the fan speed-up process.

[0046] Exemplarily, after adjusting the back pressure of the resistance plate to the vehicle system resistance, start the fan and let it speed up according to the preset speed-up curve. During this process, the noise parameters generated by the fan operation can be comprehensively tested. The noise parameters at least include the sound pressure level at different fan speeds, the noise spectrum characteristics, etc. By analyzing these noise parameters, the noise performance of the fan under the simulated vehicle resistance conditions can be accurately evaluated, providing data support for the subsequent noise reduction design and optimization of the fan. Among them, when detecting the noise parameters, the noise can be obtained through a noise detection module, such as a sound level meter, a microphone array, etc. The embodiments of the present disclosure do not make specific requirements for this, and it can be designed according to actual needs.

[0047] Due to the installation of the resistance plate, the vehicle system resistance can be simulated, the test state is closer to the vehicle state, and the obtained noise parameters are also closer to the noise parameters generated in the vehicle environment. Therefore, the noise can be optimized on the fan test bench without adjustment in the vehicle.

[0048] The embodiments of the present disclosure simulate the vehicle system resistance corresponding to the target required air volume through the resistance plate to form a more realistic test environment, obtain accurate noise parameters, and then analyze and optimize the noise parameters. The test results of the present disclosure can reflect the fan order characteristics on the vehicle, and the test results are more accurate. Therefore, the fan test bench can be optimized according to the fan order characteristics, reducing the development time and development cost.

[0049] In some embodiments, adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume includes:

[0050] Assemble the cooling module and the active intake grille on the air volume bench.

[0051] Adjust the air volume of the air volume bench to the target required air volume, and set a resistance plate on the side of the active intake grille away from the cooling module, and adjust the back pressure of the resistance plate until the back pressure reaches the system resistance corresponding to the target required air volume.

[0052] Assemble the cooling module, the active intake grille, and the resistance plate onto the fan test bench according to the position relationship calibrated on the air volume bench.

[0053] Exemplarily, to adjust the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume, first, the cooling module and the active intake grille should be assembled on the air volume bench. For example, the maximum flow rate of the air volume bench can be above 4000 m3 / h. Simulate the structure of the vehicle. Then, adjust the air volume output by the air volume bench. For example, if the target required air volume is 3000 m 3 / h, then adjust the air volume of the air volume bench to 3000 m 3 / h. A resistance plate is provided on the side of the active intake grille facing away from the cooling module to simulate the resistance of the vehicle system. However, the back pressure of the resistance plate at this time cannot represent the system resistance corresponding to the target required air volume of the vehicle, and the back pressure of the resistance plate needs to be adjusted until the back pressure reaches the system resistance corresponding to the target required air volume. For example, when the target required air volume is 3000 m 3 / h, the corresponding vehicle system resistance is 300 Pa. When the back pressure of the resistance plate is adjusted to 300 Pa, the adjustment is completed, and the back pressure of the resistance plate can reflect the system resistance of the vehicle at the target required air volume.

[0054] The current positional relationship calibration among the cooling module, the active intake grille, and the resistance plate is completed. The resistance plate can also reflect the vehicle system resistance of the vehicle at the target required air volume. It is also necessary to assemble the calibrated cooling module, active intake grille, and resistance plate onto the fan test bench to test the fan noise on the fan test bench. Among them, the positional relationship and design parameters among the structures assembled onto the fan test bench are the same as those on the air volume test bench.

[0055] In some embodiments, it further includes:

[0056] Determine the corresponding relationship between air volume and resistance based on CFD model simulation. Determine the vehicle system resistance corresponding to the target required air volume based on the corresponding relationship between air volume and resistance.

[0057] Exemplarily, the CFD (Computational Fluid Dynamics) model can be used to simulate the vehicle. For example, the vehicle cooling system can be modeled to ensure that the model accurately corresponds to the actual vehicle structure, so as to more realistically simulate the actual airflow environment. Simulate different air volume conditions. For example, at different rotational speeds, run the CFD model simulation to calculate the airflow distribution and pressure change in the cooling system to achieve the simulation of different air volumes. In the simulation results, obtain the resistance of the system under different air volume conditions. Through the analysis and processing of the resistance under different air volume conditions, determine the corresponding relationship between air volume and resistance. Here, the corresponding relationship can be expressed as a corresponding relationship curve or a corresponding table.

[0058] Determine the corresponding relationship between air volume and resistance based on CFD model simulation. When determining the target required air volume of the vehicle, the determined target required air volume can be substituted into the corresponding relationship between air volume and resistance to determine the vehicle system resistance corresponding to the target required air volume.

[0059] In addition, to ensure the accuracy of the calculation results, multiple verifications can also be carried out. For example, different CFD model settings or different calculation methods are used to calculate the system resistance under the same target required air volume, and the results are compared. If the result deviation is within a reasonable range, the calculation results are considered reliable.

[0060] In some embodiments, adjusting the back pressure of the resistance plate includes: adjusting the back pressure of the resistance plate by controlling the opening area of the resistance plate.

[0061] Exemplarily, adjusting the back pressure of the resistance plate is to make the back pressure conform to the vehicle system resistance corresponding to the target required air volume, so as to more realistically simulate the vehicle state. Adjusting the back pressure of the resistance plate includes various methods. For example, the opening area of the resistance plate can be controlled. The resistance plate can adopt a movable structure so as to be able to flexibly change the opening area. For example, the resistance plate includes a frame and a movable plate. The movable plate is arranged inside the frame and is connected by a specific mechanical structure. The plate can be set as a grid-like structure. By controlling the movement of the movable plate, the opening area of the resistance plate can be adjusted. Different opening areas result in different spaces through which the air flow can pass, so the back pressure generated will also be different.

[0062] In order to achieve precise adjustment of the back pressure of the resistance plate, it is necessary to monitor the change of the back pressure in real time. For example, a pressure sensor can be installed on the resistance plate, and this sensor can accurately measure the back pressure value. Compare the measured back pressure value with the vehicle system resistance corresponding to the target required air volume to judge whether the current back pressure meets the requirements. If it does not meet the requirements, the opening area of the resistance plate will be precisely adjusted according to the magnitude relationship between the measured back pressure value and the vehicle system resistance until the measured back pressure value meets the requirements. It should be noted that a controller can be set up to control, process, and judge through the controller.

[0063] After the system is started, the pressure sensor monitors the back pressure value on the leeward side of the resistance plate in real time and transmits the data to the control system. The control system analyzes and processes the back pressure data according to the preset control algorithm. If there is a deviation between the back pressure and the target value, the control system will calculate the direction and magnitude of the adjustment required for the opening area of the resistance plate and send a control signal to the drive mechanism. The drive mechanism precisely adjusts the opening area of the resistance plate according to the control signal. During the adjustment process, the pressure sensor continuously monitors the change of the back pressure, and the control system continuously adjusts the opening area according to the new back pressure data until the back pressure reaches the target value. The entire adjustment process is a dynamic and real-time feedback control process, which can quickly and accurately adjust the back pressure of the resistance plate to the required value.

[0064] Optionally, the resistance plate can also be perforated, and the holes are gradually increased until the back pressure of the resistance plate meets the requirements, and then the perforation is stopped. The embodiments of the present disclosure do not limit the perforation method, which can be performed by technicians or through a perforating device.

[0065] In other embodiments, the back pressure of the resistance plate can also be adjusted by controlling the tilt angle of the resistance plate.

[0066] In some embodiments, before performing a noise test based on the noise parameters during the fan speed-up process, it includes: controlling the fan test bench to simulate the operating state of the whole vehicle.

[0067] To make the results of the noise test more realistic, the fan test bench should be closer to the real operating state of the whole vehicle. Therefore, before performing the noise test, it is necessary to control the fan test bench to simulate the operating state of the whole vehicle. Exemplarily, it is necessary to make the fan test bench meet the boundaries of the whole vehicle. For example, when the whole vehicle is in the operating state, the cooling module is in the startup state. Therefore, the cooling module on the fan test bench should also be in the startup state. Or when the whole vehicle is in the operating state, the interior of the vehicle is a closed space. Therefore, the fan test bench should also simulate a closed environment, and so on. That is, control the state of the fan test bench to simulate the corresponding state when the whole vehicle is operating. It should be noted that the embodiments of the present disclosure do not make specific limitations on the specific parameters that need to be adjusted, and can be set according to the operating state of the whole vehicle. The above embodiments are only for illustration. The purpose of this step is to obtain more realistic noise parameters.

[0068] In some embodiments, performing a noise test based on the noise parameters during the fan speed-up process includes:

[0069] Obtain the overall sound pressure level curve of the noise during the fan speed-up process and the order noise curve of the fan blades.

[0070] Based on the decibel difference between the peak of the order noise curve and the corresponding overall sound pressure level curve being less than a preset difference, determine the peak point of the order noise curve to be optimized.

[0071] Exemplarily, during the process of performing the noise test, the fan will be controlled to gradually increase in speed, and the noise parameters during the fan speed-up process will be obtained. For example, the obtained noise parameters include the overall sound pressure level of the noise and the order noise of the fan blades, and then the overall sound pressure level curve and the order noise curve are obtained. Among them, the overall sound pressure level curve is used to describe the curve of the overall intensity of the noise changing with variables such as time or frequency. The overall sound pressure level curve is formed by connecting the overall sound pressure level values measured at different times or different frequencies. The order noise curve of the fan blades refers to the noise intensity curve of specific frequency components related to the rotation of the fan blades. When the fan rotates, due to the interaction between the fan blades and the air, a series of harmonic noises based on the rotation frequency of the fan blades will be generated, and these harmonic noises are called order noises. And in the above noise curves, the curves may show irregular fluctuations or obvious peaks, indicating that the noise intensity is more obvious at these positions. Each peak also corresponds to a specific order frequency and the corresponding noise sound pressure level value. For example, Figure 2 This is a noise diagram of a fan test bench provided with a resistance plate according to an embodiment of the present disclosure. Refer to Figure 2, the abscissa represents the fan speed (rpm), and the ordinate represents the noise decibel (dB). S1 represents the total noise sound pressure level curve, and L1 represents the order noise curve.

[0072] After obtaining the total noise sound pressure level curve and the order noise curve, they can be analyzed to determine the positions that need to be optimized. Based on the fact that the decibel difference between the peak of the order noise curve and its corresponding total noise sound pressure level curve is less than the preset difference, the peak points of the order noise curve to be optimized are determined. Taking Figure 2 as an example, the order noise curve includes three relatively obvious peaks, which respectively represent that the order noise corresponding to the fan speed of 1938.43 rpm is 68.10 dB, and the order noise corresponding to the fan speed of 2102.39 rpm is 64.88 dB. Set the preset difference to 6 dB, and compare the relationship between the decibel difference between the peak of the order noise curve and its corresponding total noise sound pressure level curve and the preset difference. The positions where the difference is less than 6 dB can be considered that the order noise accounts for too large a proportion in the total noise sound pressure level and needs to be optimized, so as to determine the peak points of the order noise curve to be optimized. Figure 2 When the speed is 2102.29 rpm, the corresponding order noise is 68.10 dB. Obviously, the corresponding total noise sound pressure level is less than 74 dB, so this point can be determined as the peak point of the order noise curve to be optimized.

[0073] In addition, Figure 3 This is a fan bench noise map with a resistance plate provided by an embodiment of the present disclosure. Referring to Figure 3 , the abscissa represents the fan speed (rpm), and the ordinate represents the noise decibel (dB). S2 represents the total noise sound pressure level curve, and L2 represents the order noise curve. It can be seen that Figure 3 When the resistance plate is not set, the peaks of the order noise curve are not obvious, and the order noise cannot be reflected, so it is impossible to optimize on the fan bench. And when the resistance plate is set Figure 2 the peaks can be intuitively determined, and then the peak points that need to be optimized can be determined.

[0074] In some embodiments, after determining the peak points of the order noise curve to be optimized, it further includes:

[0075] Optimizing the fan bench until the decibel difference between the peak of the order noise curve and its corresponding total noise sound pressure level curve is greater than the preset difference.

[0076] The peak points on the curve represent that at these specific order frequencies, the noise has relatively high peaks, indicating that the noise at these frequencies is more prominent. Determine the peak points of the order noise curve to be optimized. The fact that the noise at these frequencies is more prominent may be caused by problems in aspects such as the design, installation, and operation of the fan. Therefore, the fan test bench can be optimized, especially the fan. Thus, the noise generated at the peak point can be improved so that the improved result can be applied to the whole vehicle to reduce the vehicle noise.

[0077] Specifically, after determining the peak points to be optimized, the fan test bench needs to be optimized. Optimizing the fan test bench may involve multiple aspects. For example, adjusting the installation method of the fan to make the rotation of the fan blades more stable and reduce the vibration and noise caused by improper installation; improving the drive system of the fan to make the speed control of the fan more accurate and avoid the noise changes caused by speed fluctuations; or optimizing the flow field environment around the fan, such as adjusting the shapes and positions of the air inlet and outlet to improve the air flow distribution and reduce the noise generated by air flow disorder, etc. Until the decibel difference between the peak of the order noise curve and its corresponding overall noise sound pressure level curve is greater than the preset difference. At this time, there is a sufficient gap between the noise intensity corresponding to the peak in the order noise curve and the corresponding overall noise sound pressure level curve, reducing the impact of these prominent order noises on the overall noise, making the noise of the fan more uniform and stable, achieving better acoustic performance and usage effects, and meeting the relevant noise standards or user requirements.

[0078] In some embodiments, before determining the peak points of the order noise curve to be optimized based on the fact that the decibel difference between the peak of the order noise curve and its corresponding overall noise sound pressure level curve is less than the preset difference, it further includes:

[0079] Based on the positional relationship between the peak of the overall noise sound pressure level curve of the fan test bench noise test and the peak of the overall noise sound pressure level curve of the whole vehicle noise test, and combining the decibel difference between the peak of the overall noise sound pressure level curve of the fan test bench noise test and its corresponding overall noise sound pressure level curve.

[0080] Exemplarily, it is necessary to compare the fan bench noise test results with the vehicle noise test results. The vehicle noise test can obtain the total sound pressure level curve of the noise and the positions where the noise actually exists. For example, some peaks of the total sound pressure level curve are greatly affected by the order noise. Therefore, it is possible to determine which peaks of the total sound pressure level curve of the vehicle noise test are greatly affected by the order noise. In the fan bench noise test, the total sound pressure level curve can also be obtained. By comparing the two curves, the positional relationship between the peaks of the total sound pressure level curve of the fan bench noise test and the peaks of the total sound pressure level curve of the vehicle noise test can be obtained, and the peaks on the total sound pressure level curve of the fan bench noise test that are greatly affected by the order noise can be determined. Combining with the decibel difference between the peaks of the total sound pressure level curve of the fan bench noise test and the corresponding total sound pressure level curve, the preset difference can be further determined.

[0081] Figure 4 A vehicle test noise map provided by an embodiment of the present disclosure is referred to Figure 4 and Figure 2 , where the abscissa represents the fan speed (rpm) and the ordinate represents the noise decibel (dB). S3 represents the total sound pressure level curve of the noise, and L3 represents the order noise curve. Under the condition of consistent test conditions, Figure 2 is the noise map obtained by testing on the fan bench, Figure 4 is the noise map obtained on the vehicle. According to Figure 4 the test results and the noise problems of the actual vehicle, it can be determined that the peak points on S3 are prone to order noise, and the peak points with greater noise influence can be found. Correspondingly, there are also peak points near the corresponding position of S1 in Figure 2 , and the positions where the decibel difference between the peak and L1 is less than the preset difference correspond to Figure 4 the peak points with greater noise influence in. And the above judgment method is applicable to the noise tests of different types of vehicles and the fan benches corresponding to the vehicles. Therefore, based on the fan bench noise test and the vehicle noise test, it is possible to determine that the peak points of the order noise curve to be optimized can be determined according to the preset difference, and the range of the preset difference can be obtained. Subsequently, in the case of an undeveloped vehicle, the peak points to be optimized on the order noise curve can be directly determined according to the noise test results of the fan bench.

[0082] It should be noted that in order to improve the accuracy of the results, the comparison results of the fan bench noise test and the vehicle noise test in different situations can be analyzed through multiple experiments to find the correlation between the two, so as to determine the preset difference.

[0083] An embodiment of the present disclosure also provides a fan bench noise test device, and the test device includes: a control module and a fan bench.

[0084] The fan mount at least includes a resistance plate, an active intake grille, a cooling module, and a fan; the fan is fixedly arranged on a support frame; the cooling module is located on the air outlet side of the fan; the active intake grille is located on the side of the cooling module facing away from the fan; the resistance plate is located on the side of the active intake grille facing away from the cooling module.

[0085] The control module is electrically connected to the fan mount and is used to control the fan mount to perform a noise test.

[0086] Exemplarily, the test device includes a fan mount, and the noise test is carried out on the fan mount. The fan mount includes a resistance plate with the back pressure adjusted to the overall vehicle system resistance corresponding to the target required air volume, an active intake grille, a cooling module, and a fan. The fan is assembled in a fixed position, for example, arranged on the support frame of the fan mount. The cooling module is located on the air outlet side of the fan, the active intake grille is located on the side of the cooling module facing away from the fan, and the resistance plate is located on the side of the active intake grille facing away from the cooling module to simulate the positional relationship of each structure in the overall vehicle. The fan operates to provide the air volume required for the test, and the cooling module can be a radiator. After the fan starts, the generated airflow flows outwards through the cooling module, the active intake grille, and the resistance plate in sequence. The control module is electrically connected to the fan mount, and the control module can be electrically connected to each structure on the fan mount to control the operating state of each structure. The control module is also used to control the fan mount to perform a noise test. The control module can control the fan to start and adjust its rotation speed, etc.

[0087] Optionally, the test module further includes a data acquisition module for acquiring noise parameters. The test module is electrically connected to the control module and sends the acquired noise parameters to the control module. The control module can analyze the noise parameters to determine the peak points to be optimized in the order noise curve.

[0088] In some embodiments, the resistance plate includes a plurality of openings; the openings are evenly and symmetrically distributed on the resistance plate.

[0089] Exemplarily, when adjusting the back pressure of the resistance plate, it can be adjusted by changing the opening area of the resistance plate. For example, a plurality of openings are provided on the resistance plate to increase the opening area. In the resistance plate provided by the embodiments of the present disclosure, the openings are evenly and symmetrically distributed on the resistance plate so that the airflow can flow out more evenly, improving the test accuracy.

[0090] It should be noted that the embodiments of the present disclosure do not make specific limitations on the number and shape of the openings, and can be adjusted according to the actual situation.

[0091] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0092] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing the noise of a fan stand, characterized in that The fan stand includes a resistance plate, an active air intake grille, a cooling module and a fan; the method includes: Adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume; wherein the resistance plate is located on the side of the active air intake grille away from the cooling module; A noise test is performed based on the noise parameters of the fan speed-up process.

2. The test method according to claim 1, characterized in that The step of adjusting the back pressure of the resistance plate to the vehicle system resistance corresponding to the target required air volume includes: Assembling the cooling module and the active air intake grille on an air volume table; Adjust the air volume of the air volume table to the target required air volume, and set a resistance plate on the side of the active air intake grille away from the cooling module, and adjust the back pressure of the resistance plate until the back pressure reaches the system resistance corresponding to the target required air volume; The cooling module, the active air intake grille and the resistance plate are assembled on the fan stand according to the positional relationship calibrated on the air volume table.

3. The test method according to claim 1, wherein Also includes: Determine the corresponding relationship between air volume and resistance based on CFD model simulation; The whole vehicle system resistance corresponding to the target required air volume is determined based on the corresponding relationship between the air volume and the resistance.

4. The test method according to claim 2, characterized in that, The step of adjusting the back pressure of the resistance plate comprises: The back pressure of the resistance plate is adjusted by controlling the opening area of the resistance plate.

5. The test method according to claim 1, wherein Before performing the noise test based on the noise parameters of the fan speed-up process, the method includes: The fan stand is controlled to simulate the running state of the whole vehicle.

6. The test method according to claim 1, characterized in that The performing of noise testing based on the noise parameters of the fan speed-up process includes: Obtaining a total sound pressure level curve of the fan during the speed increase process and an order noise curve of the fan blades; Based on the fact that a decibel difference between a peak of the order noise curve and the corresponding total noise sound pressure level curve is less than a preset difference, a peak point of the order noise curve to be optimized is determined.

7. The test method according to claim 6, wherein After determining the peak point of the order noise curve to be optimized, the method further includes: The fan stand is optimized until the decibel difference between the peak of the order noise curve and the corresponding total noise sound pressure level curve is greater than the preset difference.

8. The test method according to claim 6, wherein Before determining the peak point of the order noise curve to be optimized based on the decibel difference between the peak of the order noise curve and the corresponding total noise sound pressure level curve being less than a preset difference, the method further includes: The preset difference is determined based on the corresponding positional relationship between the peak of the total noise sound pressure level curve of the fan bench noise test and the peak of the total noise sound pressure level curve of the vehicle noise test, and combined with the decibel difference between the peak of the total noise sound pressure level curve of the fan bench noise test and its corresponding total noise sound pressure level curve.

9. A fan stand noise test device, characterized in that, The device comprises: a control module and a fan stand; The fan stand at least comprises the resistance plate, the active air intake grille, the cooling module and the fan; the fan is fixedly arranged on the support frame; the cooling module is located at the air outlet side of the fan; the active air intake grille is located at the side of the cooling module away from the fan; the resistance plate is located at the side of the active air intake grille away from the cooling module; The control module is electrically connected to the fan stand and is used to control the fan stand to perform noise testing.

10. The test device according to claim 9, characterized in that, The resistance plate includes a plurality of openings; the openings are evenly and symmetrically distributed on the resistance plate.

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