Nonlinear Dynamic Analysis Of Aeroengine Misalignment Double Rotor System

As an important core component in the rotating system,the coupling is widely used in a variety of fields such as aviation navigation,defense military and petrochemical.Its main role is to transfer rotation and torque in the tuning system,effectively compensate for relative corners or parallelism deviations,and can effectively reduce the axial vibration,and protect the rotor.The active air engine is usually connected to the turbine rotor shaft end in a coupling in the aerospace engine.The coupling is not a secondary fault,which causes secondary faults in the air engine,causing vibration to exceed the standard,air parking,and severe or even calamity accidents such as engine machine damage,airplane crash and other catastrophic accidents.In this thesis,a real avionics dual rotor system is a research object.Firstly,the interpose of the motor coupling of the engine is not in the middle and parallel lines,and the dynamic model of the simple dual rotor system is established based on the lagrange equation.Based on the establishment of a dual rotor kinetic analysis model considering the problem of mid-to-middle faults;Secondly based on a real avionics dual rotor structure,the high-fidelity high-fidelity high dimension of complex structural engine dual rotor system is established with finite element software,and modal analysis and critical speed analysis are performed.On the basis of this high-dimensional model,the design of the model-based modal synthesis method is carried out,and the model reduction segregation program is compiled by secondary development language and C# language,and the high-precision and extremely low dimension model are obtained;Finally,the combined design and non-linear dynamics models are constructed in a non-linear dynamic model of complex rotor systems in the middle of the aerospace engine.Based on the Newmark-β numerical integration method,the transient response of the misalignment fault aeroengine complex dual rotor model is analyzed.The dynamic behavior and evolution law of the system response are studied under various parameters such as speed,coupling parallel misalignment and angle misalignment,and some valuable research results are obtained.The results show that the coupling has different degrees of dynamics in parallel and unspeakable,and the dynamic state of the rotor system responds,there is a significant dual frequency vibration component,and the speed of speed is increased,the system vibration is very sharp,the more significant increase in dual frequency vibration component;When the speed is unchanged,the change of the coupling may not be discovered.As the coupling does not increase the medium volume,the higher the system vibration amplitude,the more intense system vibration,and the larger than the double-frequency vibration component.This article has a high precision kinetic modeling of complex structural dual rotor systems containing non-mid-faults,and the failure mechanism of rotor system has certain reference and guidance.