It is indicated that operational pressure spectrum and defectsof pipeline has important influence on the lifetime of crude oil pipeline.
指出管线运行载荷谱及焊管缺陷对石油管线的服役寿命有重要影响。
2
Therefore, it is an important way to analysis the signal spectrum and determine the type of bearing defects in the study of bearing vibration signals for fault diagnosis.
因此,在对轴承振动信号进行故障诊断的研究中,对信号进行频谱分析,判断轴承缺陷的类型是一种重要方法。
3
Third, the status and defectsof system of usufruct of radio spectrum resources.