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Release time: 2019.11.19

We often hear "NVH" from the mouth of the car engineer，So what exactly is "NVH"? "NVH" is "noise (noise)、vibration (vibration)、"Harshness，As the name suggests，"NVH" represents the performance of the vibration noise of the car。Reasons for the reason，One aspect，Car design development、Manufacturing needs to pay attention to "NVH"，On the other hand，"NVH" is the inherent attribute of the car。So more and more users start paying attention to "NVH"。I will introduce to you one of the important contents of "NVH" today: wind noise。

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Simple wind noise is when our car is driving at high speed，I heard it in the carThe sound of wind.

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How did wind noise produce?

In simple terms，is when our car is driving，Relative exercise with the air，Astronomical friction and resistance to the surface of our car，Wind noise，And because the vehicle is driving，The body and the surrounding gas must have exercise。So，Wind noise is inevitable during driving.

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What are the wind noise?

First of all, what we need to understand is，The greater the wind noise，The greater the wind noise，When the speed of the car exceeds 80 km/h time，Wind noise has gradually covered the engine's sound to become the main noise source。such as:

1. Wind noisy hissing，Generally due to windshield glass、The sealing status of the door and the side window is produced。

2. Wind noise whistle，Generally due to the size of the body gap or due to the rearview mirror、Antenna and other surface structural parts are unreasonable and generated。

3. The banging sound of the sunroof，If the height of the sunroof wind net、The design of the intensity or the skylight opening design is unreasonable，When OpenObvious noise during the sunroof.

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Brother Tip

Although the relationship between wind noise and automobile design has a significant relationship，But sometimes our operations during driving will also affect the size of the wind noise。To avoid opening the side window when the vehicle is driving, we only need to pay attention to the following points:

When driving at high speed, replace it for ventilation,Try not to drive the side window, butOpen the car sunroof, and try to choose the sunroof as much as possible to avoid flatness.

No sunroofcar，In order to temporarily ventilate seabet loginventilation，When there is no passenger in the rear seat，You can onlyOpenBack window, do not open the degree of opening, stayA gap in a fingerJust.

When driving door side window，Try not to choose the window on both sides of the same side, butOpenThe side window of the diagonal directionOf course, you can't open all the windows at the same time.

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Wind tunnel test experiments

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，Pay more attention to daily use。

Important! important!

The current Volkswagen models areCar 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 wind noise when the vehicle is driving at high speed through the shape design。At the same time，inBatch production phase, Volkswagen FactoryThrough strict quality management，Strictly control the assembly manufacturing process of key seals，Eliminates the leakage sound caused by parts and components。

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