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本文以后置柴油机客车为对象，进行整车的远场、近场、噪声分离等多项试验，通过分析计算噪声样本的偏相干函数、噪声频谱，确定冷却风扇噪声、排气消声器噪声、发动机右侧传出噪声是该车的主要噪声源．在不改变该车主要结构的前提下，采用玻璃纤维吸声材料对发动机罩等部位进行屏蔽，加大冷却风扇直径降低风扇转速；在排气管消声器外包扎吸声材料等措施进行对比降噪试验，达到较好的整车降噪效果．
In this paper, after a series of tests on diesel locomotives and passenger cars, the far-field, near-field and noise separation of the vehicle are carried out. By analyzing the partial coherence function and the noise spectrum of the noise samples, the cooling fan noise, exhaust muffler noise, Side of the noise is the car’s main source of noise. Without changing the main structure of the car under the premise of using glass fiber sound-absorbing materials such as hoods and other parts of the shield, cooling fan diameter increased cooling fan speed; exhaust muffler outside the bandage of sound-absorbing materials and other measures for noise reduction comparison Test, to achieve better vehicle noise reduction.