| At present,the rotor system is more and more widely used in the mechanical field,so the rotor system is required to have good dynamic characteristics.The critical speed is directly related to the stability of the rotor and the safety of the system.Therefore,the research on the critical speed of the rotor system has always been a research hotspot of rotor dynamics.Based on the 600Wh flywheel energy storage system,the rigid flywheel rotor supported by the electromagnetic bearing is taken as the research object.From the rotor theoretical modeling,the critical speed simulation solution,the critical speed influence factor research to the rotor system experiment,the critical speed of the flywheel rotor system is studied in all directions and multiple angles.Firstly,according to the composition and support characteristics of the flywheel rotor system,the rotor body is simplified and assumed to obtain a simplified model of the rotor system.According to the simplified model of the rotor system,the Lagrange method combined with the Euler angle method is used to establish the dynamic model of the flywheel rotor system,which provides a theoretical basis for the solution and research of the critical speed.Secondly,according to the basic theory and steps of finite element analysis,the finite element method is used to solve the critical speed of the flywheel rotor system.The modal analysis of the flywheel rotor was performed using ANSYS Workbench finite element analysis software to solve the critical speed.According to the established dynamic model of the rigid flywheel rotor,the critical speed of the flywheel rotor system is solved.The critical speed results solved by the three methods are compared to verify the accuracy of the solution.The study of the influencing factors of critical speed is very important in the research of critical speed.The influence of parameter variation on the critical speed of the rotor system is studied from two aspects of physical and structural parameters.The effects of electromagnetic bearing support stiffness,damping and flywheel material on the critical speed of the rotor system are studied from the aspects of physical parameters.The effects of rotor system support structure,electromagnetic bearing support span,rotor shaft elongation and flywheel length to diameter ratio on critical speed are studied from the aspects of structural parameters.Finally,the experimental study of the flywheel rotor system is carried out.The relevant experimental equipment was used to carry out the speed-up experiment of the flywheel rotor system according to the experimental scheme.The experimental data is extracted from the oscilloscope waveform,the rotor time-frequency domain vibration and the natural frequency of the frame.The experimental data analysis confirms the accuracy of the critical speed theoretical solution,and ensures that the research topic has practical engineering value and significance. |
