Study On Multi-source Diagnosis Information Acquisition Experiment System Of Hydraulic Equipment Based On Virtual Instrument

In connection with the characterizes and the development trend of on-line monitoring and fault diagnosis of hydraulic system, this paper studied multi-source diagnostic information acquisition and fault diagnosis of hydraulic power system with the direction of expert System based on virtual instrument. The researched results are as follows:1.Basing on the gained results of our research group about the acquisition of electro-hydraulic signals and fault mechanism of hydraulic power system previously, theory of experiment system based on virtual instrument is analyzed. The experiment system and hardware platform's design principle are also discussed. In contrast to characteristizes of a variety of software, Lab VIEW is the best choice as the software platform for multi-source diagnosis information acquisition experiment system of hydraulic equipment.2.In this paper, fault diagnosis expert system is analyzed, BP ANN is basely learned, signal analysis and sensor technology are researched, the selection principle of the sensor and four types of signal transmission and bus function are also studied, at last PXI is chosen as the bus of multi-source diagnosis information acquisition experiment system of hydraulic equipment based on virtual instrument. All of these have laid a theoretical foundation for the construction of hardware and the exploitation of virtual panels.3.In order to deeply research the multi-source diagnosis information acquisition experiment system of hydraulic equipment, the elements of its mechanical system, hydraulic system and electrical system are analyzed in deep. A detailed plan for the experiment main contents and the experiment steps are carried out. The fault types, fault causes and solutions of hydraulic power system are collected, which affords basis for the establishment of knowledge base of hydraulic power system fault diagnosis, and laying a good foundation for its hardware and software.4. According to the development need of virtual panel of the fault diagnosis expert system of hydraulic power system, the hardware structure of the experiment platform to get the diagnostic information, the selection and calibration of sensors and how to construct the hardware platform for virtual instrument are studied. Afterward, virtual instrument hardware platform is constructed; Exploitation of virtual panels is completed with the help of Lab VIEW software platform. Software development includes system introduction module, on-line monitoring module, data analysis module, fault diagnosis module and a database management module. At last the feasibility of using BP ANN in the fault diagnosis expert system of hydraulic power system is discussed.