Wind noise reduction effect verification method of wind noise reduction front end part assembly

Abstract

The invention provides a wind noise reduction effect verification method for a wind noise reduction front end part assembly. The wind noise reduction effect verification method comprises the steps that the wind noise reduction front end part assembly is assembled on a vehicle; placing an artificial head sensor in the vehicle, placing the vehicle in a wind tunnel, adjusting the windward angle of the vehicle to be one of alphai and the wind speed to be one of Vk, carrying out a wind noise test, measuring wind noise within time t, and outputting a sound pressure level-frequency curve; respectively measuring wind noise corresponding to each windward angle alpha i and each wind speed Vk; a common front end part assembly without a boss is assembled on a vehicle, and a wind noise test is carried out; and corresponding to each windward angle alpha i and each vehicle speed Vk, the sound pressure level-frequency curve of the vehicle provided with the wind noise reduction front-end part assembly is compared with the sound pressure level-frequency curve of the vehicle provided with the common front-end part assembly without the boss. The method has the advantages that the verification method is simple and visual, and the wind noise reduction effect of the wind noise reduction front end part assembly can be effectively evaluated.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile wind noise reduction, and in particular to a method for verifying the wind noise reduction effect of a wind noise reduction front end parts assembly. Background Art

[0002] During the driving process of the car, the specific structure formed by the edge of the front cover 200 and the front parts close to the front cover 200 is prone to produce wind noise whistling, such as the edge of the front cover 200 and the grille assembly 100, which is prone to produce wind noise whistling, affecting the driving experience. Figure 1 As shown, the wind noise whistle is usually the edge sound produced by the shear airflow blowing directly from the surface of the grille assembly 100 to the front edge of the front cover 200. At present, most of the wind noise whistle is reduced by installing a sealing strip between the front cover 200 and the grille assembly 100. However, in this way, the sealing strip is in over-pressure contact with the grille assembly 100, which can easily cause wear on the upper surface of the grille assembly 100. On the other hand, the installation of the sealing strip will increase the cost and bring additional assembly work to the production. At the same time, due to the uneven exposure of the sealing strip and the asymmetry of the left and right, the appearance effect is poor. Therefore, it is necessary to design a front-end parts assembly that can eliminate the shear wind on the front cover of the car and reduce the wind noise whistle, and verify its wind noise reduction effect.

[0003] Invention patent content

[0004] In order to solve the above technical problems, the present invention provides a method for verifying the wind noise reduction effect of a wind noise reduction front end parts assembly, a vehicle equipped with the wind noise reduction front end parts assembly and a vehicle equipped with a common front end parts assembly without a boss are subjected to wind noise tests in a wind tunnel, the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly and the sound pressure level-frequency curve of the vehicle equipped with the common front end parts assembly without a boss, and the wind noise reduction effect of the wind noise reduction front end parts assembly is evaluated.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A method for verifying the wind noise reduction effect of a wind noise reduction front end parts assembly, the method being applied to a wind noise reduction front end parts assembly for eliminating shear wind on a front cover of an automobile, the wind noise reduction front end parts assembly having a transverse component, the transverse component being directly close to a front cover of a vehicle to be assembled, and being adapted to at least the middle portion of an edge of the front cover of the vehicle to be assembled, the transverse component being provided with a boss protruding from its windward surface;

[0007] The method comprises the following steps:

[0008] Step 1, setting a wind tunnel test condition for the vehicle, wherein the wind tunnel test condition for the vehicle includes a windward angle and a wind speed of the vehicle, wherein the windward angle of the vehicle is αi (i=1, 2, 3, ..., n1), and the wind speed is Vk (k=1, 2, 3, ..., n2);

[0009] Step 2: Assemble the wind noise reduction front end parts assembly on the vehicle;

[0010] Step 3, place an artificial head sensor in the vehicle, place the vehicle in the wind tunnel, adjust the windward angle of the vehicle to one of αi, and the wind speed to one of Vk, conduct a wind noise test, measure the wind noise within time t, and output a sound pressure level-frequency curve;

[0011] Step 4, respectively measuring the wind noise corresponding to each windward angle αi and each wind speed Vk;

[0012] Step 5: Assemble the common front end parts assembly without the boss on the vehicle and perform steps 3 and 4;

[0013] Step 6: For each windward angle αi and each vehicle speed Vk, the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss, so as to evaluate the wind noise reduction effect of the wind noise reduction front end parts assembly.

[0014] Furthermore, the windward angle αi is -20°-20°.

[0015] Furthermore, the windward angle αi is 0°, ±5°, ±10°, ±15° and ±20°, so that the windward angle αi is symmetrically arranged.

[0016] Furthermore, the maximum speed of the vehicle is Vmax, 0<wind speed Vk≤Vmax, and the maximum speed Vmax of the vehicle is one of 100-300km / h; preferably, the maximum speed Vmax of the vehicle is one of 180-240km / h, so that the wind tunnel test conditions of the vehicle are adapted to various speeds of the vehicle.

[0017] Furthermore, the wind speed Vk is set according to Vk=V0+P*(k-1), wherein V0 is one of 50-70 km / h and P is one of 10-30 km / h, so that the vehicle speed is set uniformly, thereby improving the uniformity of the measurement results.

[0018] Furthermore, the measurement time t is at least 10 s, so that the measurement time t is sufficient to output a sound pressure level-frequency curve of the wind noise whistle, and to effectively compare the sound pressure level-frequency curve of a vehicle equipped with a wind noise reduction front end parts assembly with the sound pressure level-frequency curve of a vehicle equipped with a common front end parts assembly without a boss.

[0019] Furthermore, the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss. Corresponding to each windward angle αi and each vehicle speed Vk, the vehicle equipped with the wind noise reduction front end parts assembly does not produce a whistle. The wind noise reduction effect of the vehicle equipped with the wind noise reduction front end parts assembly is qualified, which improves the requirements for the vehicle's wind noise reduction effect and improves the vehicle's comfort.

[0020] Furthermore, the wind noise reduction front end parts assembly is assembled on a vehicle, the vehicle is driven on an actual road at different vehicle speeds V′, a head-mounted microphone is arranged in the vehicle to collect sound data during driving, and it is determined whether a whistle is generated, and further a subjective evaluation is performed on the wind noise whistle of the vehicle equipped with the wind noise reduction front end parts assembly.

[0021] Furthermore, the vehicle speed V′ is 60-120 km / h, which is consistent with the vehicle speed on the actual road.

[0022] Furthermore, the gap between the front cover and the front end parts assembly, which is located behind the edge of the front cover, is blocked to eliminate the influence of wind noise generated by the narrow gap between the front cover and the front end parts assembly on the wind noise measured in the test, thereby improving the accuracy of the evaluation.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) A boss is provided on a transverse component of a front end parts assembly directly adjacent to a front cover of a vehicle to be assembled, thereby disrupting the shear airflow, changing the airflow pattern and direction causing the wind noise whistle, and achieving a wind noise reduction effect.

[0025] (2) A vehicle equipped with a wind noise reduction front end parts assembly and a vehicle equipped with a common front end parts assembly without a boss are subjected to wind noise tests in a wind tunnel, and the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly. The verification method is simple and intuitive, and can effectively evaluate the wind noise reduction effect of the wind noise reduction front end parts assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic structural diagram of an embodiment of a vehicle having an existing front end parts assembly.

[0027] Figure 2 This is a schematic structural diagram of an embodiment of a wind noise reduction front end parts assembly of the present invention.

[0028] Figure 3 The present invention is a schematic structural diagram of an embodiment of a vehicle having a front-end wind noise reduction parts assembly.

[0029] Figure 4 It is a comparative diagram of the sound pressure level-frequency curve of a vehicle equipped with the wind noise reduction front end parts assembly of the present invention and the sound pressure level-frequency curve of a vehicle equipped with a common front end parts assembly without a boss.

[0030] In the figure: 100 - grille assembly; 1 - top grille bar; 11 - boss; 12 - windward side; 13 - decorative bright strip; 200 - front cover. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0032] In the description of the present invention, it should be noted that the terms "horizontal", "vertical", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] The present invention provides a method for verifying the wind noise reduction effect of a wind noise reduction front end parts assembly, and the method is applied to a wind noise reduction front end parts assembly for eliminating shear wind on the front cover of an automobile. The front end parts assembly has a transverse component, which is directly close to the front cover 200 of the vehicle to be assembled and is at least adapted to the middle of the edge of the front cover 200 of the vehicle to be assembled, and the transverse component is provided with a boss 11 protruding from its windward surface 12. The front end parts assembly is a grille assembly 100, a light strip, or a front bumper housing.

[0034] In order to facilitate the understanding of the present invention, the front end parts assembly is described below by taking the front end parts assembly as a grille assembly 100 as an example. Figure 2 and Figure 3 As shown, the grille assembly 100 has a top grille bar 1 extending laterally, and the transverse component is the top grille bar 1; or the grille assembly 100 has a grille outer frame, and the grille outer frame has a top frame extending laterally, and the transverse component is the top frame.

[0035] According to the styling requirements of the vehicle, the automobile grille assembly 100 has a variety of shapes, for example, a horizontal bar grille, a vertical bar grille, and a grid grille. For a horizontal bar grille with a horizontally arranged top grille bar 1, the top grille bar 1 is close to the front cover 200 of the vehicle to be assembled, and a boss 11 can be provided on the top grille bar 1. For a vertical bar grille with vertically arranged grille bars and a grid grille with grid-like grille bars, the upper frame of the grille outer frame is close to the front cover 200 of the vehicle to be assembled, and a boss 11 can be provided on the upper frame. The boss 11 is added to the grille assembly 100 so that the top grille bar 1 close to the front cover 200 of the vehicle to be assembled or the upper frame of the grille outer frame has a protrusion in the direction away from the vehicle to be assembled. When the shear airflow blows toward the boss 11, the airflow direction is as follows: Figure 3 As shown in the direction of the middle curved arrow, the shear airflow is disrupted, changing the airflow pattern and direction that causes the wind noise whistle, thereby achieving the effect of reducing wind noise.

[0036] In order to ensure the wind noise reduction effect, the thickness t of the boss 11 between the two headlights of the vehicle to be assembled is 1-4mm. Setting a suitable thickness of the boss 11 can prevent the boss 11 from being too thin to affect the wind noise reduction effect, and can also prevent the boss 11 from being too thick to reduce the appearance of the grille assembly 100. While ensuring the wind noise reduction effect, it can also meet the appearance requirements to make the grille assembly 100 beautiful. Preferably, the thickness t of the boss 11 between the two headlights of the vehicle to be assembled is 2-3mm. For example, the thickness t of the boss 11 between the two headlights of the vehicle to be assembled is set to 2mm, 2.5mm, 3mm, 3.5mm, etc.

[0037] In order to ensure the wind noise reduction effect, the boss 11 is close to the upper edge of the top grille bar 1 or the upper edge of the upper frame, so that the boss 11 is as close as possible to the front cover 200 of the vehicle to be assembled. For example, when the top grille bar 1 of the grille assembly 100 is wider and a decorative bright strip 13 is arranged in the middle, the boss 11 can be arranged on the upper side of the decorative bright strip 13 to improve the effect of disrupting the shear airflow and changing the direction of the airflow.

[0038] In some embodiments, the grille assembly 100 is arranged between two headlights of a vehicle to be assembled, and the boss 11 covers all the top grille bars 1 in the extending direction of the top grille bars 1; or the boss 11 covers all the upper frame in the extending direction of the upper frame. The boss 11 is made as long as possible in the opposite direction of the width of the vehicle to improve the effect of disrupting the shear airflow and changing the direction of the airflow.

[0039] In some embodiments, the grille assembly 100 has a vehicle logo, and the vehicle logo runs through the top grille bar 1 or the upper frame. There are two bosses 11, one of which extends from the vehicle logo toward one headlight, and the other boss 11 extends from the vehicle logo toward another headlight. The bosses 11 are set according to the shape of the vehicle to ensure the wind noise reduction effect when adapting to the shape of the vehicle.

[0040] In some embodiments, reference Figure 3 As shown, the top grille bar 1 extends to above the two headlights of the vehicle to be assembled, and the thickness of the boss 11 above the two headlights gradually decreases from the close end of the two headlights to the far end of the two headlights. Or the upper frame extends to above the two headlights of the vehicle to be assembled, and the thickness of the boss 11 above the two headlights gradually decreases from the close end of the two headlights to the far end of the two headlights. The thickness of the boss 11 between the two headlights is ensured, and at the same time, the thickness of the boss 11 located on the upper part of the headlight is gradually fading corresponding to the contour of the headlight, so that the grille assembly 100 can be beautiful. Preferably, the thickness of the boss 11 above the two headlights of the vehicle to be assembled gradually decreases from the thickness t of the boss 11 located between the two headlights of the vehicle to be assembled to 0.

[0041] In order to further ensure the wind noise reduction effect and meet the appearance requirements, the boss 11 is an arc-shaped protrusion; preferably, the boss 11 is a hemispherical protrusion, so that the surface of the boss 11 is rounded to meet the fillet requirements of the front end parts assembly.

[0042] For any of the above-mentioned wind noise reduction front end parts assemblies, a method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly comprises the following steps:

[0043] Step 1, setting a wind tunnel test condition for the vehicle, wherein the wind tunnel test condition for the vehicle includes a windward angle and a wind speed of the vehicle, wherein the windward angle of the vehicle is αi (i=1, 2, 3, ..., n1), and the wind speed is Vk (k=1, 2, 3, ..., n2);

[0044] Step 2: Assemble the wind noise reduction front end parts assembly on the vehicle;

[0045] Step 3, place an artificial head sensor in the vehicle, place the vehicle in the wind tunnel, adjust the windward angle of the vehicle to one of αi, and the wind speed to one of Vk, conduct a wind noise test, measure the wind noise within time t, and output a sound pressure level-frequency curve;

[0046] Step 4, respectively measuring the wind noise corresponding to each windward angle αi and each wind speed Vk;

[0047] Step 5: Assemble the common front end parts assembly without the boss 11 to the vehicle, and perform steps 3 and 4;

[0048] Step 6. Corresponding to each windward angle αi and each vehicle speed Vk, the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss 11, and the wind noise reduction effect of the vehicle equipped with the wind noise reduction front end parts assembly is evaluated.

[0049] refer to Figure 1 and Figure 3 As shown, for any of the above wind noise reduction front end parts assemblies, a common front end parts assembly without the boss 11 corresponds thereto, and except for the boss 11, the wind noise reduction front end parts assembly has the same components as the common front end parts assembly without the boss 11. Wind noise tests are conducted in a wind tunnel on a vehicle equipped with a wind noise reduction front end parts assembly (hereinafter referred to as a wind noise reduction vehicle) and a vehicle equipped with a common front end parts assembly without the boss 11 (hereinafter referred to as a common vehicle). Wind noise tests are conducted on the wind noise reduction vehicle and the common vehicle at various windward angles αi and wind speeds Vk, and corresponding sound pressure level-frequency curves are output. The windward angle of the vehicle is set to αi (i=1, 2, 3, ..., n1), and the wind speed is Vk (k=1, 2, 3, ..., n2). There are n1 windward angles αi and n2 wind speeds Vk. The wind noise reduction vehicle and the ordinary vehicle output n1*n2 sound pressure level-frequency curves respectively. The n1*n2 sound pressure level-frequency curves of the wind noise reduction vehicle can be compared with the corresponding n1*n2 sound pressure level-frequency curves of the ordinary vehicle to evaluate the wind noise reduction effect of the wind noise reduction front end parts assembly.

[0050] In some embodiments, the windward angle αi is set to -20°-20° to simulate different windward directions when the vehicle is actually driving. Preferably, the windward angle αi is set to 0°, ±5°, ±10°, ±15° and ±20°, so that the windward angle αi is set symmetrically.

[0051] The wind speed is set according to the speed of the vehicle to simulate the wind speed of the vehicle when it is actually traveling. When the maximum speed of the vehicle is Vmax, 0<wind speed Vk≤Vmax. During the test, a suitable speed is selected between 0-Vmax as the wind speed Vk, so that the wind tunnel test conditions of the vehicle are adapted to various speeds of the vehicle. According to the design of the vehicle, the maximum speed Vmax of the vehicle is one of 100-300km / h; preferably, the maximum speed Vmax of the vehicle is one of 180-240km / h. For example, the maximum speed Vmax of the vehicle can be 160km / h, 180km / h, 220km / h, 240km / h, 280km / h, etc., and accordingly, the maximum values ​​of the wind speed Vk are 160km / h, 180km / h, 220km / h, 240km / h, 280km / h, etc. Preferably, the wind speed Vk is set according to Vk=V0+P*(k-1), wherein V0 is one of 50-70 km / h and P is one of 10-30 km / h, so that the vehicle speed is set uniformly and the uniformity of the measurement results is improved.

[0052] For example, when V0 is set to 60km / h, P is set to 20km / h, and the maximum vehicle speed Vmax is 200km / h, the wind speed Vk is set to 60km / h, 80km / h, 100km / h, 120km / h, 140km / h, 160km / h, 180km / h, and 200km / h for each windward angle αi. For each windward angle αi, a wind noise measurement is required for each 20km / h increase in vehicle speed. If the windward angle αi is set to ±5°, ±10°, ±15°, it is necessary to measure the wind noise at 6 windward angles and 8 wind speeds Vk, and perform 48 measurements on the wind noise reduction vehicle and the ordinary vehicle respectively, output 48 sound pressure level-frequency curves, and then compare the 48 sound pressure level-frequency curves of the wind noise reduction vehicle with the 48 sound pressure level-frequency curves of the ordinary vehicle corresponding to the same windward angle αi and the same wind speed Vk to evaluate the wind noise reduction effect of the wind noise reduction front end parts assembly. Figure 4 As shown in FIG. 1 , a schematic diagram comparing the sound pressure level-frequency curve of a wind noise reduction vehicle and a sound pressure level-frequency curve of an ordinary vehicle at a certain windward angle αi and a wind speed Vk of 90 km / h is shown. Figure 4It can be seen that the difference between adjacent peaks and valleys of the sound pressure level-frequency curve (curve a) of the wind noise reduction vehicle is small, and the curve is smoother overall. In frequency region A, the sound pressure level-frequency curve (curve b) of the ordinary vehicle is in the frequency interval of about 100Hz, and the difference between the maximum peak and the minimum valley is greater than 5dB, with obvious peaks, which is about 14dB higher than the sound pressure level of the wind noise reduction vehicle of the same frequency. In this frequency region A, the sound pressure level of the wind noise reduction vehicle is lower than that of the ordinary vehicle, and the intensity of the wind noise whistle is low, which verifies the wind noise reduction effect of the wind noise reduction front-end parts assembly and illustrates the effectiveness of the wind noise reduction of the wind noise reduction front-end parts assembly. Moreover, by comparing the sound pressure level-frequency curve of the wind noise reduction vehicle with the sound pressure level-frequency curve of the ordinary vehicle, the wind noise reduction effect of the wind noise reduction front-end parts assembly is verified, and the method is simple and intuitive.

[0053] In some embodiments, the measurement time t is at least 10 s. For example, the measurement time t can be set to 10 s, 15 s, 20 s, 30 s, etc., so that the measurement time t is sufficient to output the sound pressure level-frequency curve of the wind noise whistle, and effectively compare the sound pressure level-frequency curve of a vehicle equipped with a wind noise reduction front end parts assembly with the sound pressure level-frequency curve of a vehicle equipped with a common front end parts assembly without the boss 11.

[0054] The sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss 11. For each windward angle αi and each vehicle speed Vk, the vehicle equipped with the wind noise reduction front end parts assembly does not produce a whistle, and the wind noise reduction effect of the vehicle equipped with the wind noise reduction front end parts assembly is qualified. In this way, the requirements for the wind noise reduction effect of the vehicle can be improved and the comfort of the vehicle can be improved. For example, wind noise is measured corresponding to 6 windward angles and 8 wind speeds Vk, and the wind noise reduction vehicle and the ordinary vehicle are measured 48 times respectively, and 48 sound pressure level-frequency curves are output. It is necessary to compare the 48 sound pressure level-frequency curves of the wind noise reduction vehicle and the 48 sound pressure level-frequency curves of the ordinary vehicle accordingly. The 48 comparisons all show that the vehicle equipped with the wind noise reduction front end parts assembly does not produce a whistle, and the wind noise reduction effect of the vehicle equipped with the wind noise reduction front end parts assembly is qualified.

[0055] In some embodiments, the wind noise reduction front-end parts assembly can also be installed on a vehicle, and the vehicle is driven on an actual road at different speeds V' to conduct an actual road wind noise test. A head-mounted microphone is configured in the vehicle to collect sound data during driving, and to determine whether a whistle is generated, and further to conduct a subjective evaluation of the wind noise whistle of the vehicle equipped with the wind noise reduction front-end parts assembly. Preferably, the vehicle speed V' is 60-120km / h, which is consistent with the speed of the vehicle on the actual road.

[0056] In order to eliminate the influence of wind noise generated by the narrow gap between the front cover 200 and the front end parts assembly on the wind noise measured in the test and improve the accuracy of the evaluation, the gap between the front cover 200 and the front end parts assembly and located behind the edge of the front cover 200 can be blocked during the wind tunnel wind noise test and the actual road wind noise test, and only the wind noise generated by the edge sound can be measured.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for verifying the wind noise reduction effect of a wind noise reduction front end parts assembly, characterized in that: The method is applied to a wind noise reduction front end parts assembly for eliminating shear wind on a front hood of an automobile. The wind noise reduction front end parts assembly has a transverse component, the transverse component is directly close to the front hood of the vehicle to be assembled, and is at least matched with the middle part of the edge of the front hood of the vehicle to be assembled, and the transverse component is provided with a boss protruding from its windward surface; The method comprises the following steps: Step 1, setting a wind tunnel test condition for the vehicle, wherein the wind tunnel test condition for the vehicle includes a windward angle and a wind speed of the vehicle, wherein the windward angle of the vehicle is αi (i=1, 2, 3, ..., n1), and the wind speed is Vk (k=1, 2, 3, ..., n2); Step 2: Assemble the wind noise reduction front end parts assembly on the vehicle; Step 3, place an artificial head sensor in the vehicle, place the vehicle in the wind tunnel, adjust the windward angle of the vehicle to one of αi, and the wind speed to one of Vk, conduct a wind noise test, measure the wind noise within time t, and output a sound pressure level-frequency curve; Step 4, respectively measuring the wind noise corresponding to each windward angle αi and each wind speed Vk; Step 5: Assemble the common front end parts assembly without the boss on the vehicle and perform steps 3 and 4; Step 6: For each windward angle αi and each vehicle speed Vk, the sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss, so as to evaluate the wind noise reduction effect of the wind noise reduction front end parts assembly.

2. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1, characterized in that: The windward angle αi is -20°-20°.

3. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 2, characterized in that: The windward angle αi is 0°, ±5°, ±10°, ±15° and ±20°.

4. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1, characterized in that: The maximum speed of the vehicle is Vmax, 0<wind speed Vk≤Vmax, the maximum speed Vmax of the vehicle is one of 100-300km / h; preferably, the maximum speed Vmax of the vehicle is one of 180-240km / h.

5. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 4, characterized in that: The wind speed Vk is set according to Vk=V0+P*(k-1), where V0 is one of 50-70 km / h and P is one of 10-30 km / h.

6. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1, characterized in that: The measuring time t is at least 10 s.

7. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1, characterized in that: The sound pressure level-frequency curve of the vehicle equipped with the wind noise reduction front end parts assembly is compared with the sound pressure level-frequency curve of the vehicle equipped with the ordinary front end parts assembly without the boss. Corresponding to each windward angle αi and each vehicle speed Vk, the vehicle equipped with the wind noise reduction front end parts assembly does not produce a whistle, then the wind noise reduction effect of the vehicle equipped with the wind noise reduction front end parts assembly is qualified.

8. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1, characterized in that: The wind noise reduction front-end parts assembly is assembled on a vehicle, and the vehicle is driven on an actual road at different speeds V′. A head-mounted microphone is installed in the vehicle to collect sound data during driving and determine whether a whistle sound is generated.

9. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 8, characterized in that: The vehicle speed V′ is 60-120km / h.

10. The method for verifying the wind noise reduction effect of the wind noise reduction front end parts assembly according to claim 1 or 8, characterized in that: Block the gap between the front cover and the front part assembly, behind the edge of the front cover.

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