Due to the huge economic losses caused by the disaster dump of the equipments for device fabrications and construction companies, status monitoring of the equipments appears to be especially important as the precondition of fault predicting, fault analysis and diagnosis. 由于设备故障停机而造成的经济损失对设备制造企业和施工单位都会是不小的数目,于是设备的状态监测作为预测故障、故障分析和诊断的先决条件就显得格外重要。