汽車噪音有四個“源頭”：發(fā)動機噪音、輪胎噪音、空氣中的噪音和車身結構造成的噪音。
Car noise has four "sources": engine noise, tire noise, noise in the air, and noise caused by body structure.
1.發(fā)動機噪音。除發(fā)動機體發(fā)出的機械聲外，還包括進氣系統(tǒng)噪音，即高速氣體經空氣濾清器、進氣管、氣門進入氣缸，在流動過程中，會產生一種很強的氣動噪音。發(fā)動機噪音主要由擋火墻和駕駛室的前底板部位傳入駕駛艙。
1. engine noise. Besides the mechanical sound emitted by the body, it also includes noise of intake system, that is, high speed gas enters the cylinder through air filter, intake pipe and valve, and produces a very strong aerodynamic noise during the flow. The noise of the engine is mainly composed of a front wall and bottom parts of the cab into the cockpit.
2.輪胎噪音。一般的胎噪主要由三部分組成：一是輪胎花紋間隙的空氣流動和輪胎四周空氣擾動構成的空氣噪音；二是胎體和花紋部分震動引起的輪胎震動噪音；三是路面不平造成的路面噪音。
2. tire noise. The general tire noise is mainly composed of three parts: one is the air noise of tire tread clearance and the air noise caused by air disturbance around tires; the two is tire vibration and noise caused by carcass and tread partial vibration, and the three is road surface noise caused by road roughness.
3.空氣噪音。一是風噪，就是由車身周圍氣流分離導致壓力變化而產生的噪音；二是風漏，或叫吸出音，是由駕駛室及車身縫隙吸氣而與車身周圍氣流相互作用而產生的噪音；三是其他噪音，包括空腔共鳴等。
3. air noise. One is the wind noise, is the body flow separation around cause pressure variations and noise; two is the wind leakage, or call suckout tone, is composed of the cab and the body and the body around the air suction slot as a result of the interaction of noise; three other noise, including cavity resonance etc..
4.車身結構噪音。主要是受兩個方面因素影響，一是車身結構的震動傳遞方式，二是車身上的金屬構件由于在里外作用下產生震動而產生噪音。
4. noise of body structure. It is mainly affected by two factors. One is the vibration transmission mode of the body structure. The two is the noise generated by the vibration of the metal components on the body due to the vibration inside and outside the body.
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