The Research Of The Large Centrifugal Pump Condition Monitoring And Fault Diagnosis Device

In ship system,when the rotating machinery equipment such as large centrifugal pumps, generating units,speed gear box and big fans works,vibrations must be generated.If the vibrations are too large,the equipment may be destroyed,this may be a threaten to the ship's sailing.So,in order to make the equipments work effective,the condition monitoring and alarming device is necessary.When the rotating machinery equipment works,compare with other parameters,vibration parameters can be a more direct,rapid and accurate reflection of the operational status of equipments.So,usually,we choose the vibration parameters as the base of the rotating machinery equipments' condition monitoring and running trend forecast. However,in normal use conditions,with aging equipments,their vibration intensity is often beyond the default alarm value which makes the equipment alarm too frequently.Specially, now in the ship system,there are a lot of old even extended active duty equipments.Compare whit the new equipment,there is a greater security risk when use the old equipment.But, consider of the cost,we can't eliminate them blindly.Aim at this situation,use of modern computer technology,this article designs a device which can be used in large centrifugal pump's online monitoring.The device uses embedded computer system which basis on MCU gives an online monitoring continuously and save data on time,the data will be analyzed by a computer.In hardware,the device uses the MCU C8051F340 as the core control chip,gets signal through sensors,saves data by USB disks.In software,uses C language to program the MCU,while the computer will be programmed by VC++6.0,using VC++6.0's good image processing capability,gives the saved data a visualization deal,then the finally results will be gave.The article uses a ship's large centrifugal pump which is in extended active duty as specific monitoring object,explains the large centrifugal pump condition monitoring and fault diagnosis device's design principle,software and hardware's implement and the large centrifugal pump's alarming process.Through the analysis of large amounts of data,we get the result of the large centrifugal pump's fault diagnosis standard which was recognized by the experts in an accreditation council.