Research On Dynamic Characteristics And Vibration Transmission Of Elastic Supporting Structure

As an important part of the rotating machinery,the performance and service life of the rotor system have great influence on the reliability and safety of the rotating machinery.As an important part of the rotor system,the dynamic characteristics and vibration transfer characteristics of the elastic supporting structure are very important for the subsystem and even the whole life of the rotating machinery.The internal excitation of the elastic support caused by the rotor system leads to a series of problems,such as large deformation and fatigue damage,etc.Therefore,the study of dynamic characteristics and vibration transfer of elastic support structures has become an important research topic in the field of rotating machinery vibration.In this paper,a squirrel cage elastic support structure of a certain type of aircraft engine as the research object,and es Table.lished a separate elastic support structure,simplified stiffness of the rotor system,and the coupled model of elastic support-rigid rotor system analysis of the elastic support structure in rotor imbalance,wrong,and under the rubbing fault of vibration response and vibration transfer characteristics,the main research content is as follows:(1)Considering the structure characteristics of the cage,tapered web,large elastic deformation characteristics,chose different finite element types,es Table.lished a squirrel cage,conical shell finite element model of elastic support and bearing components web,on the model,has carried out the elastic supporting structure in the rotor system with rubbing fault imbalance,misalignment and the resolving power of the study,The vibration response of different components of the elastic support structure is analyzed,and the vibration transfer characteristics between different components are obtained.(2)The empirical formula and finite element method were used to obtain the stiffness of the elastic supporting structure.The dynamic model of the rotor system based on the simplified stiffness was es Table.lished,and the force from the simplified support model was input to the finite element model of the elastic support based on the mechanical transfer method.The finite element model based on the mechanical transfer was constructed,and the vibration response characteristics and transfer characteristics of the model under different fault states were analyzed.(3)Based on the multi-body dynamics theory and the finite element method,the rigid-flexible coupling model of the elastic support and rigid rotor system was jointly es Table.lished on the software platforms of ADAMS and ANSYS,with the supporting structure as flexible and the rotating shaft and the rotating plate as rigid.The vibration response and vibration transfer characteristics of the elastic support structure under the condition of unbalance,misalignment and friction of the rotor system are analyzed.In this paper,based on three different models of single-support finite element model,force transfer model and elastic-supported rigid rotor system dynamics,the dynamic characteristics and vibration transfer characteristics of the elastic support structure are studied.The vibration response and vibration transfer characteristics of the elastic supporting structure under the excitation of unbalance,misalignment and rubbing are obtained.The research work in this paper provides a certain theoretical support and technical reference for the research of vibration transfer characteristics of the elastic supporting structure in the rotating subsystem.