For a long time , people are always paying attention to the problem of monitoring equipment status in manufacturing in order to know about the equipment operation status and oil quality . and they made a lot of research , such as vibration , yawp , temperature , oil , sound emission and lossless detection technology , and so on 在制造行业中，长期以来，人们为了能及时了解设备运行状态和油液质量，一直关注对设备状态的监控问题，也做出了很多研究和探索，如振动监测技术、噪声监测技术、温度监测技术、油液分析技术、声发射技术和无损监测技术等。
In the second chapter , the characteristics of noises are introduced . some basic methods of supervision and monitoring are issued . on the basis of some guideline about measurement , the method of construction of faulty monitoring system on mechanical noises is brought forward aiming at requirement of bss 第二章介绍了噪声的特性，提出了基本的噪声监测方法；在查阅了有关噪声测量标准的基础上，针对盲分离( bss )技术的特点，设计机械噪声监测与故障诊断系统的方案。
