"NVH", a word often mentioned by automobile engineers，At present, it is gradually popular among car users。The reason for it，On the one hand，Car design development、Manufacturing needs to pay attention to "NVH"，On the other hand，"NVH" is the inherent attribute of the car，Users also follow "NVH"。What is "NVH"?

"NVH" means

"Noise" (noise)

"vibration" (vibration)

"Harshness" (irregularity)

The first letter of the three words，As the name suggests，"NVH" represents the performance of the vibration noise of the car。I will introduce to you one of the important contents of "NVH" today: wind noise。

What is wind noise?

Car wind noise refers to when the car is driving at high speed，When the external airflow passes through the body，Noise that can be heard inside the vehicle。When driving at high speeds of the vehicle (driving high seabet io-speed roads)，Wind noise is the most important noise source，The faster the speed of the car，The greater the wind noise。

How did wind noise come out?

Simply put，Wind noise is a kind of air dynamic noise。A relative movement with airflow when the car is driving，Airflow excitation effect is all parts of the car，directly or indirectly affects the noise in the car。When the body is like a windshield，When the door secret seals are sealed, the seal is not well sealed，You can feel the leakage of wind noise in the car。Another，Auto surface flow lines will inevitably generate pneumatic separation，As a result, air power pulse，Its role is on the surface of the car structure，Causes noise and transmit it in the car。When the vehicle is driving，The body and the surrounding gases are inevitable to move。So，Wind noise is the inherent attribute of sports cars，inevitable。

What are the wind noise?

First，The larger the speed of the car，The greater the wind noise，When the vehicle speed exceeds 80km/h，Wind noise gradually becomes the main in -car noise source。such as:

1、Wind noisy hissing，Generally due to windshield glass、Destin and side window sealing status is poor and produced。

2、Wind noise whistle，Generally due to the size of the body gap or due to the rearview mirror、The shape of the surface structure of antenna and other surface structures is unreasonable and generated。

3、Sky Window Sound Bang Bang Sound，If the height of the sunroof wind net、The design of the intensity or the skylight opening design is unreasonable，A clear sound vibration phenomenon will occur when opening the sunroof。

seabet appAlthough the relationship between wind noise and car design is important，But sometimes the user's operation will also affect the size of the wind noise。In order to avoid the sound vibration phenomenon caused by opening the side window when the vehicle is driving:

1、When driving at high speed，For ventilation，Try not to drive on the side window，Instead of opening the car sunroof，and try to choose the sunroof，Avoid flat opening。

2、Car without sunroof，In order to temporarily ventilate ventilation，When there is no passenger in the rear seat，You can only open the window，Don’t be too big，Just leave a finger gap。

3、When the side window of the driving door，Try not to choose the window on both sides of the same side，but the side window of the diagonal direction，Of course，Not to open all the windows at the same time。

The above is a brief introduction to the car NVH — the generation of wind noise and form related knowledge，I believe everyone has a deeper understanding of wind noise，Also pay attention to the use of cars。

At present, Volkswagen models are in the car design stage，It will be reasonably designed for the shape of the vehicle and external parts through simulation calculations and a large number of wind tunnel tests、R & D，Strive to reduce the wind noise when driving at high speed through the design design，At the same time，During the batch production stage，The Volkswagen Factory passes through strict quality management，Strictly control the assembly manufacturing process of key seals，Eliminates the leakage sound caused by parts and components。