NONLINEAR DYNAMICS OF AERO-ENGINE ROTOR SYSTEM IN MANEUVER WITH RUB
A Jeffcott model, supported by two identical squeeze film damps at the end of shaft in a fighter plane is analyzed in this paper. First, a mathematical model is set up based on the loads analysis in three maneuver motions, in which the nonlinear oil film force, rub impacts, and the additive centrifugal force and gyroscopic force are taken into account. Then this model is solved by Runge-Kutta method under three different circumstances: level flight, steady circle flight, and unsteady circle flight. Third, from the model the stable responses in level and circle flight are got and the bifurcation diagrams are plotted, with the working angular velocity from 650 to 1800rad/s. The comparison between the bifurcation diagrams of the level flight and circle flight shows that maneuver can markedly affect the parameter range for quasi-periodic response and chaotic response in the bifurcation diagram. For unsteady circle, transient analysis is necessary because the gyroscopic force and centrifugal force caused by maneuver are piecewise. In different range of time the loads on the rotor system is different which will change the response. The bearing orbits and frequency spectrum has different characteristics also in different range of time. So it is significant to consider the loads caused by maneuver when analyzing the response of aero-engine rotor system. These studies are useful for fault monitoring and diagnosing.
He Weifeng Xiong Chun Li Yinghong Cheng Li
Department of Aircraft and Engine Engineering of the Engineering Institute Air Force Engineering Uni Changsha Aeronautical Vocational Technical College, Changsha, China, 410124 Department of Aircraft and Engine Engineering of the Engineering Institute Air Force Engineering Uni
国际会议
昆明
英文
170-177
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）