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机动车辆噪声的大小与它的发动机转速、车速有关。与转速有关的噪声主要来自空气动力噪声(进、排气噪声和冷却风扇噪声)和发动机表面辐射噪声(燃烧、活塞敲击声,气门机噪声,供油系统噪声,齿轮噪声等)。与车速有关的噪声主要来自传动噪声(变速器、传动轴等)、轮胎噪声和车体产生的空气动力噪声(高速时)。下表列出了距车辆行驶中心线7.5米处的单车的噪声。据实验,车速加倍(变速器档位不变)或转速加
The size of motor vehicle noise and its engine speed, speed. Speed-related noise mainly comes from aerodynamic noise (intake and exhaust noise and cooling fan noise) and engine surface radiated noise (combustion, piston percussion noise, valve noise, oil supply system noise, gear noise, etc.). The speed-related noise mainly comes from transmission noise (transmission, transmission shaft, etc.), tire noise and aerodynamic noise (at high speed) from the body. The table below lists the noise of a bicycle 7.5 meters from the vehicle’s center of travel. According to the experiment, the speed doubled (transmission gear unchanged) or speed plus