Nonlinear Vibration Behavior of Aero-Engine Rotor-Bearing System in Maneuvering Flight

Analyzing the dynamic characteristics of an aero-engine rotor-bearing system helps professionals predict and judge the dynamic behavior of aero-engines. It is different from the traditional dynamic analysis of rotor system with fixed foundation, this paper considers the dynamics of the rotor-bearing system caused by the horizontal yawing maneuver load. This paper establishes a finite element model of a double-disc rotor-bearing system, and use the Newmark-β algorithm to solve the system. The model established in this paper is compared with the model established in ANSYS software, and the correctness of this model is verified. The influence of the maneuver load on the nonlinear dynamics of the rotor-bearing system under horizontal yawing is analyzed in detail. The study found, the maneuver load can suppress nonlinear vibration; the increase of maneuver load can reduce the nonlinear influence of the system caused by changes in relevant bearing parameters; and between two times the critical speed and three times the critical speed, the system will produce rich and complex nonlinear dynamic phenomena such as single periodic motion, multi periodic motion, and quasi-periodic motion.