| At present, the large rotating machinery plays a more and more important role in industrial production. The complex work environment and development requirements of high load, high speed make the rotating machinery often appears all sorts of fault, of which coupling misalignment is a main kind. The misalignment of coupling are divided into parallel, angel, comprehensive misalignment usually according to the type of misalignment Elastic couplings are used a lot in rotating machinery due to its certain compensating ability of displacement and angle.In the gear system, there are meshing frequency and its high harmonics, vibration characteristics of gear system and its relationship with parameter can be used as the main basis of fault diagnosis of misaligned coupling.On the basis of the existing misalignment theory, this paper analysis the mechanism of misaligned elastic coupling and the vibration characteristics of gear system under misaligned elastic coupling, then gets the vibration characteristics under different misalignment.According to the theoretical analysis, creating gear-rotor-coupling model, establishing3D model, and then carrying dynamics analysis, getting the fluctuation and impact situation of revolving speed of gear system and the main characteristic frequency in different misalignment under misaligned elastic coupling.Establishing two-stage gear system, carrying many times tests with control variables for different kinds of misalignment, getting the test data. Dealing with the data with MATLAB, getting the relationship between revolving speed, load, amount of misalignment and characteristic frequency.Obtaining the diagnostic methods of misaligned elastic coupling fault synthetically by analyzing time domain, frequency domain, trajectory of shaft center, holographic spectrum, getting the conclusion that we can diagnose misalignment fault effectively handing on the waveform and frequency domain, assisting with trajectory of shaft center, holographic spectrum. |
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