Study On Response Characteristics And Stability Of Rotor System Under Sudden High Energy Excitation Load

In this paper,the transient response analysis method of the rotor system with nonlinear support under the base pulse excitation is studied.the rotor system model under sudden high-energy base excitation load is established,and the analysis method of sudden high-energy base excitation load is studied,and the correctness of the model and analysis method is verified by experimental research.On this basis,the response characteristics of the rotor system with elastic support,bearing and squeeze film damper under the sudden high-energy foundation excitation load are studied,and the influence of different parameters on the response characteristics of the rotor system under the sudden high-energy foundation excitation load is obtained.The research contents and achievements of this paper are as follows:1)Considering the scale of nonlinear solution and the applicability of the analysis method,the finite element model of the rotor system is established,and the time domain simulation method is used to simulate the base impulse excitation load.The finite element model matrix and the base impulse excitation load matrix of the rotor system are derived.2)On the basis of Hertz contact theory,the nonlinear stiffness of the bearing is modeled;considering the nonlinear stiffness of the bearing,the dynamic model of the bearing rotor system with nonlinear stiffness of the bearing is established;the nonlinear force of the bearing is solved by Newton-Raphson method,the differential equation of the rotor system is solved by Newmark-βmethod,and the corresponding program of calculation and analysis is compiled;The simulation of the transient response of the stiffness support rotor system is studied,and the effects of speed,pulse amplitude,pulse width,pulse form and pulse phase on the response of the nonlinear stiffness support rotor system are explored.3)Considering the nonlinear characteristics of the squeeze film damper,the dynamic equation of the system is established;The Newton-Raphson method is used to solve the nonlinear oil film force,the Newmark-β method is used to solve the differential equation of the rotor system motion,and the corresponding program of calculation and analysis is compiled;The transient response characteristics of elastic support-squeeze film damper-rotor system are studied,and the applicability of squeeze film damper under base pulse excitation is explored.4)The bearing-rotor model is installed on the vibration table,and the speed,pulse amplitude,pulse width and pulse form are taken as the test variables,The experimental research on the response characteristics of the rotor system under the basic pulse excitation is carried out,and compared with the simulation results in Chapter 3,which verifies the correctness and applicability of the modeling and analysis methods in this paper.