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运用噪声分离、频谱分析等技术手段 ,找出了GZ6 92 1型后置柴油机大客车噪声超过国家标准的原因 ,并对主要噪声源及其频谱分布进行了分析 .对各主要噪声源———排气系统、冷却系统和发动机舱采取相应的降噪措施 ,如降低风扇转速 ,改善抗性消声器的降噪能力 ,修改冷却风进风道 ,平衡车两侧的噪声源 ,在发动机舱中粘贴吸音材料等 .改进后GZ6 92 1型大客车最大加速度时的车外噪声由 91.5dB(A )降到 86dB(A)以下 ,达到国标GB 1495- 75“机动车允许噪声”的规定 .
By means of noise separation and spectrum analysis, the reason why the noise of the GZ6 92 1 rear-engine diesel bus exceeds the national standard is found, and the main noise sources and their spectral distribution are analyzed. Exhaust system, cooling system and engine compartment to take appropriate noise reduction measures, such as reducing the fan speed, improve the noise resistance of the muffler, modify the cooling air into the air duct, balance the car noise source on both sides of the paste in the engine compartment Sound-absorbing materials, etc. The noise of the improved GZ6 92 type 1 passenger car with maximum acceleration reduced from 91.5dB (A) to below 86dB (A), meeting the requirements of GB 1495-75 Noise Permitted for Motor Vehicles.