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The gear box is used to change the running speed and passing of various machinery and equipment used power transmission components, key components in the machinery and equipment, and is also prone to the failure of a component, the gearbox fault diagnosis diagnosis has important practical significance . The virtual instrument technology to replace the idea of ??hardware-based software, the use of computer software algorithms to achieve the functionality of traditional instrumentation, it is the product of the combination of computer technology and testing techniques. Diagnosis of gearbox technology and virtual instrument technology combined with gearbox vibration signal analysis and processing method, developed a simple and practical gearbox failure diagnostic. The paper first discusses the current gearbox fault diagnosis technology background and development of the current situation at home and abroad, clear the purpose and significance of the study of this subject. Then the structure starting from the gearbox, gears, rolling bearings and shaft vibration mechanism on the research and analysis of the characteristics of the various components of the primary failure mode and each mode of vibration signals. Chapter III of this article from the time domain, frequency domain and time-frequency domain on the gearbox vibration signal analysis and processing, easy fault diagnosis of the fault characteristic parameters of the time-domain and time domain waveforms in the time domain, frequency domain amplitude spectrum, refinement spectrum and demodulation spectrum analysis, Gabor transform in the time-frequency domain, wavelet analysis and wavelet packet analysis method, based on the characteristics of the fault signal, select an effective diagnostic method, introduced wavelet packet decomposition band energy monitoring application in gearbox fault diagnosis on the phase difference spectrum correction method for fault diagnosis system to improve the accuracy of fault diagnosis. Chapter IV of the article based on the virtual instrument, the design and development of fault diagnostic process, details of the instrument hardware system, including the choice of sensors and measuring point layout, signal conditioning and data acquisition card selection subsystem management module, data acquisition module, signal processing module, data management module and the auxiliary function modules, etc. then introduced the main part of the design and development of software, and the results of experimental verification of development and design. Finally, according to the characteristics of the gearbox, developed a simple and practical gearbox failure diagnostic validate their experiments, the function of each part of the test gearbox fault diagnostic results prove that the diagnostic equipment can diagnose gearbox Typical failure, demonstrated the feasibility and effectiveness of the gearbox diagnostic.
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