Abstract:Planetary gearboxes are more widely used in many mechanical devices because of many advantages. The vibration response is more complex than that of the fixed gearbox, therefore the corresponding dynamic model established and fault diagnosis have become the research difficulty and hotspot in recent years. The dynamic model of planetary gear system was established. By solving the dynamic model of the planetary gear system, the model analysis of the spectral response characteristics of planetary gear tooth breaking system was carried out using MATLAB/Simulink module. At the same time, based on modern signal processing method using object oriented programming language Visual C++6.0 and relational database SQL Server as tools, a database of fault diagnosis type and signal processing method was established, which was entered into fault database according to different characteristics of fault. A set of software of agricultural machinery condition monitoring and fault diagnosis was studied and developed. The planetary gear box fault diagnosis testbed was used to test of software design. By comparing the test signal, the accuracy of the analysis results of the dynamic model is verified, and the software has the usability and accuracy.