汽车噪音有四个“源头”：发动机噪音、轮胎噪音、空气中的噪音和车身结构造成的噪音。
Car noise has four "sources": engine noise, tire noise, noise in the air, and noise caused by body structure.
1.发动机噪音。除发动机体发出的机械声外，还包括进气系统噪音，即高速气体经空气滤清器、进气管、气门进入气缸，在流动过程中，会产生一种很强的气动噪音。发动机噪音主要由挡火墙和驾驶室的前底板部位传入驾驶舱。
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.轮胎噪音。一般的胎噪主要由三部分组成：一是轮胎花纹间隙的空气流动和轮胎四周空气扰动构成的空气噪音；二是胎体和花纹部分震动引起的轮胎震动噪音；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.空气噪音。一是风噪，就是由车身周围气流分离导致压力变化而产生的噪音；二是风漏，或叫吸出音，是由驾驶室及车身缝隙吸气而与车身周围气流相互作用而产生的噪音；三是其他噪音，包括空腔共鸣等。
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.车身结构噪音。主要是受两个方面因素影响，一是车身结构的震动传递方式，二是车身上的金属构件由于在里外作用下产生震动而产生噪音。
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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