目前,国内外均认为空压机的主要噪声源是空气动力性噪声。然而,我们通过实测,并根据声压叠加的原理和1/3倍频程噪声频谱、自功率谱密度函数及相干（凝聚）函数的分析,将空压机噪声源分离的结果,确定风冷式2V-6/8型空压机的第一主噪声源是气阀的机械撞击噪声,它将近占总噪声声功率的一半;其次才是进、排气和风扇等的空气动力性噪声,它们的总和才占总噪声声功率的40％多一点。 At present, domestic and foreign air compressors are considered the main source of noise is aerodynamic noise. However, based on the measured results, and based on the principle of superposition of sound pressure and the 1/3 octave noise spectrum, the self-power spectral density function and the coherence (coherence) function analysis, we determined the air-cooled Type 2V-6/8 air compressor is the first main source of noise is the mechanical noise of the valve, which accounts for nearly half of the total noise power; followed by intake, exhaust and fan aerodynamic noise, Their sum is only a little over 40% of the total noise power.