Study On Dynamic Characteristics Of Rotor-diaphragm Coupling-bearing System

In this paper, for rotor-membrane coupling-bearing system in ship power equipment,the dynamics and stability of this system is studied theoretically and experimentally. Thedynamic model of rotor-membrane coupling-bearing system was established based on themethod of the equivalent section. The dynamic behavior was analyzed using Fortran andMatlab, including nature characteristics, unbalance response of the system. The maincontributions and conclusions of the work were exhibited as follows:Firstly, the history of the rotor coupling bearing system and the development ofelastic diaphragm coupling was introduced, including the structure type and characteristicof diaphragm coupling.The misalignment of the membrane coupling was analyzed. Thedynamics model of diaphragm coupling was established. And the anisotropic stiffness ofdiaphragm coupling was simulated. Dynamic simulation including the bending stiffness,torsional rigidity and axial rigidity and experiment of rotor-membrane coupling isemployed to verify the accuracy of the dynamic simulation model.Secondly, this typical part of the system was analyzed, such as shaft section, disk,bearing etc. Their kinetic model was also established. According to the previous result ofanalysis, the dynamic model of rotor-diaphragm coupling-bearing system wasestablished.Again, the diaphragm coupling-bearing the inherent characteristics of the systemwere studied. The numerical results show that, the natural frequency of rotor systemincreased with the bigger diaphragm coupling anisotropic stiffness. The rotor bearingsystem dynamics model is solved by the Newmark-method. The numerical results showthat, the vibration amplitude of some nodes was increased as the speed is increased withthe speed, while others are reduced. Under the same speed, the vibration response peak ofthe node witch near the diaphragm coupling was larger than others. When the diaphragmcoupling misalignment occurs, the response of the system obviously appear in the "8"type.Finally, this kind of variation tendency was verified by the experiment. In the future,these studies provide reference for the study of the rotor-bearing system with diaphragm coupling in the future.