Vehicle speeds frequently fluctuate due to the prevailing heterogeneous traffic conditions on Indian roads. Accordingly, traffic noise levels are affected by different noise sources that depend on various vehicular and roadway characteristics. In order to simulate the actual vehicle noise generation at the possible speeds on Indian roads, an integrated method has been developed in this study to quantify the engine and tire–road noise levels. The governing parameters considered for the pass-by noise quantification include vehicle speed, type of pavement and gear shift/gear transmission. The measured A-weighted noise levels [LAmax (dB)] revealed that tire–road noise levels increased with the rise in vehicle speeds irrespective of the vehicle type and type of the pavement. Further, the tire–road noise levels quantified through the new methodology closely matched the noise levels measured by the standard coast-by method. The cross-over speeds for engine propulsion noise and tire–road interaction noise occur at much lower speeds on the cement concrete pavements compared to the asphalt pavements. On a decisive note, the perspective of measuring the roadside noise levels coupled with an engine propulsion noise measurement as reported in this study is first of its kind and can be used for noise measurements on critical urban roads by priming with the conventional pass-by methods.

中文翻译：

---

城市道路通过噪声水平的量化：发动机推进和轮胎-道路相互作用的影响

由于印度道路上普遍存在的异质交通状况，车速经常波动。因此，交通噪声水平受到取决于各种车辆和道路特性的不同噪声源的影响。为了模拟在印度道路上以可能的速度产生的实际车辆噪声，本研究开发了一种综合方法来量化发动机和轮胎-道路噪声水平。通过噪声量化考虑的控制参数包括车速、路面类型和换档/齿轮传动。测得的 A 加权噪声水平 [LAmax (dB)] 表明，无论车辆类型和路面类型如何，轮胎-道路噪声水平都会随着车速的增加而增加。进一步，通过新方法量化的轮胎-道路噪声水平与标准海岸法测量的噪声水平非常匹配。与沥青路面相比，水泥混凝土路面的发动机推进噪声和轮胎-道路相互作用噪声的交叉速度发生在低得多的速度下。重要的是，本研究报告的路边噪声水平测量与发动机推进噪声测量相结合的观点是同类产品中的首创，可通过使用传统的通过方法启动关键城市道路的噪声测量.