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Support hydraulic valve test system fault diagnosis software reliability study

Author: XieFang
Tutor: WangZuo
School: University of Electronic Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Hydraulic system Expert system Fault Diagnosis Software Reliability
CLC: TH165.3
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Support hydraulic valve testing system in order to solve the fault occurs incentives complex and integrated , leading to failure is difficult to rule out the problem , we developed a set based on LabVIEW hydraulic system online condition monitoring and fault diagnosis expert system . The system and data acquisition system bus , intelligent control and virtual instrument technology theory combination can quickly find out the location and cause of the failure of the test system , and to provide to the user the failure to exclude recommend . Therefore, the application of the fault diagnosis expert system to avoid blindly find fault, maintenance time and cost savings , improve operational efficiency and economic benefits of the system . The fault diagnosis expert system based on LabVIEW development platform. First, build a hardware platform based on NI Online status monitoring module . NI data acquisition boards to collect the back monitoring parameter signal is detected by the sensor , such as pressure , temperature , and flow , and then handed over to the computer software for data analysis and processing , and extracted fault feature signal . Second, the development of fault diagnosis module. Parameter measurement principle , the characteristics of signals and equipment during normal operation parameters are compared in order to determine whether the failure occurred . Implementation alarm and fault handling . Otherwise , the parameter changes to be predicted. In addition, elaborated the principle of production rules to represent knowledge and the establishment of a knowledge base of expert system using Microsoft Access . Finally , establish a reasonable explanation mechanism for the cause of the malfunction , the occurrence of a specific location and solutions presented in easy-to-understand way . The fault diagnosis expert system to achieve the visualization of the operating parameters of the hydraulic system and high efficient fault diagnosis capability . At the same time , with the powerful data processing toolkit in LabVIEW can be more post-processing of the collected data , in order to meet the needs of different users .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Flexible manufacturing systems and flexible manufacturing cell > Fault diagnosis and maintenance
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