The Technical Analysis Of Condition Monitoring And Measuring Of The Hydraulic Devices Based On Current Signal

The technique of condition monitoring and measuring is a method, which is used in improving reliability and security of the running of hydraulic devices. Now, intelligence diagnoses system such as specialty system, neural network, multimedia technique, and information mixing technique have been used in the condition monitoring and failure diagnose of hydraulic system. Integrated application of the lots of diagnose technique can decrease the difficulty of diagnoses, reduce the time of diagnose, improve work efficiency bring much economic effect to enterprise.This text bring forward the method of condition monitoring and measuring of the hydraulic devices based on current, which aim at the shortage of current diagnoses method. Making current diagnose device based on working condition and failure diagnose .Pick up current signals which reflect working condition of hydraulic system , establish mathematical model of hydraulic system, bring up input power condition monitoring parameter, test result indicates the feasibility of this method. Provide science foundation for product development. The main content and conclusion of this text are as follows:1. Establish dynamic model of hydraulic system through theoretical analysis and scientific study, analysis cupping parameter, discuss the principle of current signal condition identification.2. Analysis the changing rules of current signal at all kinds of working condition, making current demodulation equipment. Establish mathematical model of hardwired connection, analyze demodulated current and second-order active Butterworth low pass filter, imitating analysis the important parameter, finish the software demodulated of Hilbert transform, the test result is good. The equipment is provide with the function of giving a alarm out of limit, laid the groundwork for the future product development.3. Analysis condition monitoring method of hydraulic system using virtual device,realize the power monitoring of hydraulic system and motor based on software development of LabVIEW, establish power mathematical model of motor-oil pump, analysis the power changing rules of motor on the working condition of no loading, loading, unloading. Design the power monitoring instrument using the methods of analysis of spectrum, measuring the power factor, instantaneous power and so on, realize the power monitoring of motor- hydraulic system.