Lubricants And Equipment Fault Diagnosis

The normal methods for diagnosing failures of the equipment include: vibration, acoustic emission, temperature monitoring, etc.. The advantages of these methods are direct, observe easily and can be used on line. The disadvantages are that its diagnosing precision is lower, forecasting cycle is short, lacking uniform standard and has little help for analyzing the reasons of the failures. In this thesis, lubricating oil has been regarded as the main body for diagnosing equipment failure. The lubricating oil is the medium of the wear grain of the equipment, its composition will degraded during the operating cycle. The deposits produced in equipments and polluted by varied external aberrant substances etc. can make rubbing wear corrupt and then cause faults. So we can know the equipments information under working through the analyses of lubricants. The author heavily elucidates that how to forecast the failure of the equipment and how to look for fault source according to the lubricant' s variation. The specific failure cases have been analyzed by the diagnosing method based on the lubricating oil. At the same time, the diagnosing method based on the lubricating oil had be combined with the common analytical approaches, such as temperature rise, vibration and abrasive particles, in order to enhance the foresight, accuracy and immediacy of fault diagnosis.