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首先讓我們來了解下汽車噪音的類別及產生，車內的噪聲主要是由發動機等機械構件噪聲（發動機噪聲）、輪胎與地面的摩擦聲（路噪）、汽車沖破空氣幕產生的碰撞及摩擦聲（風噪）、外環境傳入車內的聲音（如大貨柜車呼嘯而過的聲音. .）、駕駛艙內飾板等部件發生震動產生的內部噪音等組成。

1.車輛發動機是噪音的一個來源，它的噪音產生是隨著發動機轉速的不同而不同(主要通過：前翼子板、引擎蓋、擋火墻、排氣管產生和傳遞)。
1 vehicle engine is a source of noise, the noise it generates is different with different engine speed (mainly through: front fenders, hood, firewall blocking the exhaust pipe production and delivery).

2.路噪是車輛高速行駛的時候風切入形成噪音及行駛帶動底盤震動產生的，還有路上沙石沖擊車底盤也會產生噪音，這是路噪的主要來源(主要通過：四車門、后備箱、前翼子板、前輪弧產生和傳遞)。
2 high-speed driving road noise is cut to form when wind noise and vibration generated by travel drive chassis, as well as the impact of gravel road car chassis will produce noise, which is the main source (mainly through road noise: the four-door, back-up boxes, front fender, front wheel arc generation and delivery).

3.胎噪是車輛在高速行駛時，輪胎與路面磨擦所產生的，視路況車況來決定胎噪大小，路況越差胎噪越大，另外柏油路面與混泥土路面所產生的胎躁有很大區別(主要通過：四車門、后備箱、前葉子板、前輪弧產生和傳遞)。
3 is a vehicle tire noise at high speeds, tire and road surface friction generated, depending on the traffic condition to determine the size of tire noise, traffic, the worse the bigger tire noise, another tire and asphalt concrete pavement has generated very impatient The big difference (mainly through: four doors, trunk, front fender, front wheel arc generation and transmission).

4.風噪是指汽車在高速行駛的過程中迎面而來的風的壓力已超過車門的密封阻力進入車內而產生的，行駛速度越快，風噪越大(主要通過：四門密封間隙、包括整體薄鋼板產生和傳遞)。
4 is the pressure of the wind wind noise at high speed in the vehicle during the oncoming over door seal resistance generated in the car, the faster the traveling speed, the greater the wind noise (mainly through: four sealing gap , including the overall thin steel production and delivery).

5.共鳴噪和其他.車體本身就像是一個箱體，而聲音本身就有折射和重疊的性質，當聲音傳入車內時，如沒有吸音和隔音材料來吸收和阻隔，噪音就會不斷折射和重疊，形成的共鳴聲(主要通過：噪音進入車內，疊加、反射產生)。
5 resonance noise and other vehicle body itself, like a box, and the sound itself is refracted and overlapping nature of the vehicle when an incoming sound, if there is no sound absorption and sound insulation and barrier to absorb the noise will continuous refraction and overlap, forming a resonance sound (mainly through: noise into the car, overlay, reflections).

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