轻型载货汽车车外噪声分析与控制

Analysis and Control of Light-duty Truck Pass-by Noise

针对某轻型载货汽车车外噪声超出ECE R51—02规定限值的状况,采用噪声隔离法对噪声源进行了识别,运用噪声迭加原理确定了其车外主要噪声源,并通过优化发动机喷油预喷角以及采用吸声、隔声材料等降噪措施对其进行了降噪处理。通过对降噪前、后该车车外噪声测试分析表明,采取降噪措施后,被试车辆车外加速噪声由82 d B(A)下降到77.4 d B(A),满足了ECE R51—02对该类车辆车外加速噪声限值的要求。

For a light-duty truck noise exceeding the limit of ECE R51-02, we use the noise isolation method to identify noise sources, and the principle of superposition of noise to determine the main noise sources outside the truck. And we also take the measures, i.e. optimization of the engine fuel injection advance angle, and using the sound absorption and sound insulation material for noise reduction. Test analysis of the pass-by noise of the vehicle shows that the pass-by noise of the truck, after taking noise reduction measures, declines from 82 dB （A） down to 77 dB （A）, which satisfies the requirement of acceleration noise limit of the ECE R51--q）2 on this class of vehicle.