车用发动机噪声源识别方法的研究

Research on Application of Sound Intensity Measurement to Identify Noise Source of Engine

利用声强测试中的p-p法,对一台汽油机的噪声进行声强测试,将测试得到的数据用STARAcoustics声强分析软件进行处理和分析,得出发动机各个包络面的等声强分布、声强矢量分布、声功率和声功率级的计算结果;利用这些结果分析和识别了该发动机几个包络面的主要噪声源,确定了其噪声源的位置、主要噪声频率、声功率的大小及声功率的贡献,为降低该发动机噪声提供了改进依据。

This paper uses p-p sound intensity technique to test the noise of petrol machine,analyze datum what is collected and stored in STAR acoustics structural measurement systems. Contour maps and sound intensity vector can be drawn after analysis, sound power and sound power level can be computed. These results identify the main noise source of this engine,its source of noise＇ s position, main noise frequency, sound power magnitude and contribution of sound power, and makes reference to reduce the noise that emitted from the tested engine.