以SW240E型液压挖掘机为例,首先探讨了定置工况下机外辐射噪声的测量和评价方法.通过频域范围内噪声信号的自功率谱密度函数以及频谱曲线的均方根(RMS)值来获取等效连续A声级以评价挖掘机机外辐射噪声水平.然后将测量得到的噪声幅值曲线分解为1/3倍频程图,得到的噪声中心频率曲线,以判别主要噪声频带范围.最后根据分析结果,总结出噪声的成因以及判定依据,并给出改进建议.%SW240E hydraulic as an example is taken, discussed the measurement and evaluation method of the excavator radiation noise in stationary condition. Equivalent continuous sound level A is obtained to evaluate the excavator radiation noise level by the power spectrum density function and the root mean square ( RMS ) of the spectrum curve. Then the noise amplitude curve is decomposed into 1/3 octave graphs, to get the noise center frequency curve, to identify the main noise frequency band range. Finally according to the analysis result, the reason of the noise is sum up, and given improvement suggestion.
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