| As the core component of rotating machinery,the stability of rotor system directly affects the working performance of rotating machinery.If the rotor system is unstable,the working efficiency of the machine will be affected if it is light,and economic losses and major safety accidents may be caused if it is heavy.For rotating machinery with sealing requirements,the transmission device and the seal on the rotor play a decisive role in the stability of the rotor system.The influence of both on the rotor system makes the dynamic characteristics of the rotor system more complex.This paper aims at the rotor system under the influence of the transmission device and the seal,establishes a multi-degree-of-freedom non-linear system model considering various influencing factors on the premise of comprehensively considering the system influencing factors and the degree of freedom of the system,and researches the dynamic characteristics of the rotor system under the influence of the transmission device and the seal,which is helpful for improving the stability of the rotor system and providing a theoretical reference for further research.Based on the dynamics theory,this paper adopts the research idea of "first part then whole"for the sealed rotor system considering gear meshing characteristics.Firstly,the planetary gear speed-increasing system and the rotor system with contact seals are analyzed comprehensively and deeply,and the multi-degree-of-freedom equivalent dynamic models considering the influence of various excitation factors are established respectively.Then the two parts are integrated,the dynamic differential equation of the sealed rotor system considering gear meshing characteristics is deduced,and the dynamic differential equation of the system is solved by using the numerical integration method and Matlab programming software.Finally,the simulation analysis and experimental research are carried out,and the simulation and experimental results are compared with the theoretical results respectively to verify the rationality of the theoretical model.The main contents of this paper are as follows:(1)For planetary gear transmission system,nonlinear factors such as backlash,comprehensive meshing error and time-varying meshing stiffness are described mathematically A dynamic model of translation-torsion coupling of multi-degree-of-freedom planetary gear transmission system considering the influence of multiple factors is established by using the lumped parameter method,which can be extended to any number of planetary gears or any series.According to the movement relationship between the components,the relative displacement and stress between the components are analyzed.The dynamic differential equation of the model is deduced(2)In view of the sealed rotor system,considering its specific structure and the influence of various parts,the interaction relationship between the contact seal and the rotor is analyzed Based on the simplified mass-spring-damping model,the dynamic model of Jeffcott type system is established,and the dynamic differential equation is deduced(3)The planetary gear transmission system and the sealed rotor system are integrated Through independent analysis of the planetary gear transmission system and the sealed rotor system,the dynamic model of the sealed rotor system considering gear meshing characteristics is established by using the centralized parameter method,and the dynamic equation of the system is given.The numerical integration method is adopted,and Matlab software is used to compile the program,the dynamic differential equation of the system is solved,and the relevant dynamic response characteristic diagram of the rotor under different working conditions is obtained(4)The simulation analysis and experimental research are carried out on the sealed rotor system considering gear meshing characteristics.The simulation results,experimental results and theoretical results are compared and analyzed respectively,and the rationality of the theoretical model is verifiedThe dynamic research and simulation work in this paper can provide some theoretical references for further research on the dynamic characteristics of this kind of sealed rotor system. |
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