Research On Remote Fault Diagnosis Signal Processing Technologies And Systems

Remote fault diagnosis starts a new research field with the perfection of Internet technology from the middle of 1990's, and shows its prosperous future. Developing remote fault diagnosis is the effective approach to making good use of Internet resources, improving production efficiency and lowering enterprise costs.Digital signal processing(DSP) is the core of fault diagnosis technology, especially, which has been brought into a completely new Spring with the development of modern DSP. The algorithm and application to unstationary signal analysis are distussed with wavelet transform in order to overcome defect of Fourier transform only applied to stationary signal analysis on frequency domain. Some comparisons are made between them. Fast algorithms of both discrete and orthonormal wavelet and wavelet packet coefficient are diagrammatized to be introduced. Daubechies wavelet is applied to help to discuss the application and test on signal filtering and noise reduction with the principle and threshold implementation; The basic principle to pickup the fault characteristics is introduced mainly about the relations between the maximum module and signal saltation point and how to characterize the saltation point with Lipschitz exponent. The fractal theory application to fault diagnosis is tried in order to overcome the defect of wavelet transform to nonlinear signal analysis and complicated machine diagnosis, including the concept, function and application about fractal dimension and the process of applying it to analyze the libration signal of rolling bearing and engine burning.Development of networking makes good hardware foundation for the remote technology, and distributed idea, component-based reusable technology and object-oriented encapsulation make good software foundation for creating network application system. According to the present research of remote diagnostic system, analyzed the various Internet applications, proposed the framework-based on Windows Distributed interNet Application(Windows DNA) which caters to the overlord marketing of Windows platform in the world. And this framework would develop his great function in the remote field because of its distribution, opening, scalability and good adaptability. The concept and technology of distributed computing environment are introduced in detail, followed by the introduction of service and function which Windows DNA provides. The feasibility of applying Windows DNA to remote fault diagnostic system is discussed and afterwards showed its construction in detail, network security plus.