DYNAMIC STUDY OF RUB-IMPACT OF DUAL-ROTOR SYSTEM AND EXPERIMENTAL VERIFICATION BASED ON VIBRATION ACCELERATION
WANG Nanfei1JIANG Dongxiang1 HAN Te1,2XU Hongzhi1
1. Tsinghua University, State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Beijing 100084, China；
2.AVIC Aero engine Control Institute, Wuxi Jiangsu 214063, China
Based on the rub-impact characteristics of aero-engine, the dynamic model of dual-rotor system with rub-impact is established.The elastic deformation, contact penetration and elastic damping support during rub-impact occurred between the casing and wheel disk are fully considered. A finite element model and its boundary conditions of quayside gantry crane are established in this paper.Collision force and friction are calculated by utilizing Hertz contact theory and Coulomb model, then kinetic differential equations of rub-impact under dry rubbing status is derived. The first ten natural frequencies, the corresponding mode shapes and time-history of displacement response are given based on the analysis of the modes and dynamic response of this gantry crane system. The calculation and analysis above may be helpful for preventing the gantry crane from working on resonant area and for keeping the oversize dynamic deformation under restraint, which can be applied to design quayside gantry crane systems.Applying the variable step size fourth order Runge-Kutta method, rub response of dual-rotor system is obtained. As for aero-engine, it may not be accessible to directly obtain the displacement signal, only to acquire the acceleration signal. In order to extract the bearing pedestal acceleration vibration characteristics under rub-impact status, dual-rotor system test rig is designed. The rub-impact experiments are carried out and the vibration acceleration signals collected from bearing pedestal are analyzed by means of frequency spectrum and envelop analysis methods in order to extract the rubbing faults’ characteristics. The results that frequency doubling and multiple frequency from two different exciting sources can be considered as typical characteristics of rub-impact in aero-engine. The beat vibration usually becomes noticeable when the speed difference of the dual-rotor speed is less than 20% of the operating speed. Dynamic simulation are in accordance with the experiments to verify the effectiveness of the proposed rub-impact model of dual-rotor system.
王南飞1， 蒋东翔1， 韩特1,2，徐洪志1. 双转子系统动静碰摩动力学研究与基于振动加速度的实验验证[J]. 振动与冲击, 2017, 36(14): 71-76.
WANG Nanfei1JIANG Dongxiang1 HAN Te1,2XU Hongzhi1. DYNAMIC STUDY OF RUB-IMPACT OF DUAL-ROTOR SYSTEM AND EXPERIMENTAL VERIFICATION BASED ON VIBRATION ACCELERATION. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(14): 71-76.
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