Simulation And Experiment Research On Oil-leakage And Misalignment Of Rotor System

In the modern industrial production, application of rotating machinery occupies very important position. Rotor system fault is important issue relation to national economic production safety. Liquid are often stored or leaked into the cavity of rotor system, constituted oil-leakage rotor system. As long as there is a little oil, it will significantly affect the vibration characteristics of the rotor system. Besides misalignment fault accountes above60%of rotor system faults. In the installation and operation of machine, many reasons may arouse machine vibration, shaft joint deflection, bearing friction damage, oil film unsteady, shaft inflex and other faults, do great harm to stability run of system.This paper analyzes oil fault and misalignment fault of rotor system, and the dynamic characteristics of system is studied, and the oil and misalignment model of rotor system is established. Based on this, dynamic simulation is done, and qualitatively analyze oil and misalignment effect on the stability of rotor system. Experiment on misalignment rotor is completed, and results are obtained. Contrast betweeen experiment and simulation is done, and simulation results are proved true. Conclusions are as follows:(1) According to mechanical properties and movement characteristics of oil and oil disk, dynamic model of rotor system is established. Simulation is done and results are obtained. This paper analyzes effect of rotate speed, oil mass and damping coefficient on oil-leakage rotor system vibration.(2)3-D model is established in Solidworks and imported to ADAMS. Rotor shaft is flexible, then rigid-flexible model of oil-leakage rotor system is established and a simplified model of oil is also established. Dynamics simulation is completed, and simulation results are obtained. Qualitatively analyze cavity oil effect on rotor system.(3) With newmark numerical method, simulation of motion differential equations of rotor-bearing system is completed. Then influence of rotate speed on rotor vibration is studied, and dynamic response is obtained under misalignment fault. Experimental study on rotor system misaligement fault is complete, and compared experiment results with simulation calculation, the simulation results are correct.(4) Shaft orbit, three-dimensional spectral figure together with wavelet are applied to analysis the vibration signal and to make diagnose for the rotor vibration fault. The analysis result and theory character were compared to test the effect of our diagnose method and to confirm the progress of vibration fault diagnose for rotor system.Therefore, conclusions of this paper are useful to fault diagnose of rotor.