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Large diaphragm group Fault Diagnosis System

Author: JiangChao
Tutor: HanQingDa
School: Northeastern University
Course: Mechanical Design and Theory
Keywords: Diaphragm Acoustic emission Grey Troubleshooting Virtual Instrument
CLC: TH323
Type: Master's thesis
Year: 2008
Downloads: 55
Quote: 1
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Abstract


Large diaphragm pumps are an important field of industrial production machinery and equipment , one of the running state of a direct relationship with the plant's production efficiency, therefore , the state of their work online monitoring and fault diagnosis is essential . Diaphragm unit vibration , and other problems that affect the unit safe and stable operation of the main factors. Therefore, the unit vibration , temperature , and other parameters that affect plant operation monitoring is critical , fault diagnosis diaphragm also improve production efficiency and raw material supply security running an important measure . This paper describes the conduct online monitoring and fault diagnosis diaphragm significance , followed by the main components for diaphragm failure mechanism was analyzed , discussed the various parts of the vibration characteristics of wavelet analysis and gray correlation method for vibration , etc. signal feature extraction and fault identification made ??a thorough research . Crankshaft is the most important part diaphragm , is one of the most complex parts of the force . Its size parameters significantly influenced the overall size and weight of the diaphragm , diaphragm pumps also affects the reliability and lifetime. Crankshaft as the main object of study, the whole crankshaft using ANSYS software to establish a realistic three-dimensional model , using the finite element method for three-dimensional finite element analysis to study the overall state of stress and deformation of the crank case , crankshaft design provides a theoretical support . For the crankshaft vibration crack fault diagnosis method than using a more accurate diagnosis of acoustic emission method . The system consists of a hardware signal line monitoring systems and signal monitoring and analysis software system composed of two parts . Signal monitoring hardware system mainly consists of a variety of sensors , amplifiers , capture cards , IPC etc. ; online monitoring and fault analysis software system is mainly based on virtual instrument technology, using LabVIEW and MATLAB mixed programming , mainly to complete the signal acquisition, processing and fault alarms , diagnostics and other functions. Application of virtual instrument technology to build the monitoring and fault diagnosis system, you can complete a variety of signal line automatic monitoring and fault identification, reduces test costs and improve test efficiency , and enhance the flexibility of the system , to facilitate the testing laboratory .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Pump > Volume of the pump > Diaphragm
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