Vibration Reducing Analysis And Experimental Study Of A Rotor System With Elastic Support

As the cardiac of aircrafts,aero engines supply a steady flow of power,but their performance make a big difference to the people's livelihood and the national security.In view of its high load,super power of large rotating machinery and the machining accuracy requirements are extremely high,the special working environment and the bad structure is extremely complex,and the work environment is often affected by various external excitation force due to the action of large amplitude vibration causing the failure,which is fatal for the safe reliability and service life of blow.But the relevant scholars found that the fact that nonlinear elastic support stiffness and damping often appear in the rotor system is an important cause of sub-harmonic,bi-stable,super harmonic or chaotic jumping nonlinear vibration,which greatly limit the stability and fatigue life of aero-engine system,so the vibration characteristics of elastic impacting on the support of the rotor system have become a priority among priorities of engine development work.The aero-engine rotor system is an important component with a lot of elastic supports,which are mainly composed of bearings,cage and damper components,the dampers include the elastic ring and rubber damper element,elastic ring squeeze film damper bearing,they exhibit different mechanical properties and have a certain influence on the rotor system.The relevant components for the rotor system of aero engine in this paper,followed by the dynamic characteristics of the mechanical properties of their analysis,focus on the damper element elastic ring bearing,nonlinear characteristics of elastic ring bearing which were studied further,for formulas under the corresponding condition of rigidity and damping,and then combined with a symmetric single disc rotor test platform to establish a dynamic differential equation,based on certain assumptions to draw the mechanical model diagram,lists the dynamic differential equation of the system,Newton-Raphson's method is used to solve the iterative dynamic differential equation through software programming,then the equation analysis of influence on the vibration characteristic of the rotor system.Finally,according to the real aero-engine complex model and the similarity theory of the system,we deduce the result and design a set of rotor test rig.The rotor system is mainly researched and designed to finish the final processing,assembly and surface oxidation.The test bed using different materials and rubber materials with different width were tested,the damping properties were tested under different speed and several test results show that the damping effect of the rubber ring with inverted U shape on the vibration characteristics of rotor system,a damping zone exists,this analysis and numerical simulation results are consistent,and through multi group comparison of test results of rubber damping material parameters determined the optimum ratio of vibration velocity field and corresponding conditions.