根据对浙江省丽水市2001-2003年市区环境噪声污染的监测，对丽水市噪声污染现状进行了分析。
The environmented noise monitoring data from 2001-2003 in Lishui city is analysed by the method statistics, and analyze the data .
运用此方法对内燃机主轴承不同间隙下的噪声信号进行分析，结果表明，此方法能有效地提取故障的特征，实现状态监测。
Applying the order bi-spectrum in the analysis of engine noise signals shows that it can extract the fault characteristics and realize the state monitoring.
通过对黄石市多年环境噪声监测结果的统计，分析了黄石市环境噪声的现状水平和污染特征，并提出相应的防治对策。
This paper presents the statistics in testing the environmental noise of Huang Shi City for years, and analyzes the present levels and pollution features.
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