|
|
|
| Effects of low frequency and large swing base motion on dynamic characteristics of sliding bearing-rotor system |
| ZHANG Wenzhuo, LI Ming, HAN Yongchao |
| Department of Mechanics, Xi’an University of Science and Technology, Xi’an 710054, China |
|
|
|
|
Abstract Considering factors, such as, base motion with low frequency and large swing and nonlinear oil film moments caused by tilting of rotor in bearings, the dynamic model of a sliding bearing-rotor system was established using Lagrange equation. Then, effects of base motion on nonlinear dynamic characteristics of the system were studied using the numerical method. The results showed that after the rotor system loses its stability for the first time, its dynamic bifurcation characteristics have two-branch of upper and lower complex quasi-periodic motions, and the rotating speed during the system losing its stability for the second time rises; when the rotor speed is higher, the rotor’s vibration amplitude increases sharply, and it reaches inner wall of bearing bush in quasi-periodic stage and can’t transit to chaotic state; effects of swing frequency and amplitude variation of base motion on dynamic characteristics of the system were discussed; the above conclusions are helpful to understand motion laws of sliding bearing-rotor systems with low frequency and large swing base motion.
|
|
Received: 26 September 2019
Published: 15 April 2021
|
|
|
|
［1］林富生,孟光. 飞行器内SFD-转子系统的动力学特性研究［J］. 振动工程学报, 2004, 17(4): 403-407.
LIN Fusheng, MENG Guang. Study on the dynamic characteristics of SFD-rotor system in aircrafts［J］. Journal of Vibration Engineering, 2004, 17(4): 403-407.
［2］DUCHEMIN M, BERLIOZ A, FERRARIS G. Dynamic behavior and stability of a rotor under base excitation［J］. Journal of Vibration and Acoustics, 2006, 128(5): 576-585.
［3］祝长生,陈拥军. 机动飞行时发动机转子系统动力学统一模型［J］. 航空动力学报, 2009, 24(2):371-377.
ZHU Changsheng, CHEN Yongjun. General dynamic model of aeroengine’s rotor system during maneuvering flight［J］. Journal of Aerospace Power, 2009, 24(2): 371-377.
［4］EL-SAEIDY F M A, STICHER F. Dynamics of a rigid rotor linear/nonlinear bearings system subject to rotating unbalance and base excitations［J］. Journal of Vibration and Control, 2010, 16(3): 403-438.
［5］DAKEL M, BAGUET S, DUFOUR R. Nonlinear dynamics of a support-excited flexible rotor with hydrodynamic journal bearings［J］. Journal of Sound and Vibration, 2014, 333(10): 2774-2799.
［6］侯磊. 机动飞行环境下转子系统的非线性动力学行为研究［D］. 哈尔滨：哈尔滨工业大学, 2015.
［7］倪德,朱如鹏,靳广虎,等. 机动飞行时直升机尾传动轴的横向振动建模与特性［J］. 振动与冲击, 2014, 33(7): 215-220.
NI De, ZHU Rupeng, JIN Guanghu, et al. Modeling and characteristics of bending vibration for helicopter tail drive shaft during maneuver flight［J］. Journal of Vibration and Shock, 2014, 33(7): 215-220.
［8］陆凤霞, 朱如鹏, 倪德. 直升机机动飞行对尾传动轴临界转速的影响［J］. 振动与冲击, 2016, 35(11): 109-115.
LU Fengxia, ZHU Rupeng, NI De. Influence of a helicopter’s
maneuvering flight on critical speed of its tail drive shaft［J］. Journal of Vibration and Shock, 2016, 35(11): 109-115.
［9］CHEN L Q, WANG J J, HAN Q K, et al. Nonlinear dynamic modeling of a simple flexible rotor system subjected to time-variable base motions［J］. Journal of Sound and Vibration, 2017, 404:58-83.
［10］LIU Z X, LIU Z S, LI Y, et al. Dynamics response of an on-board rotor supported on modified oil-film force considering base motion［J］. Journal of Mechanical Engineering Science, 2018, 232(2): 245-259.
［11］HAN Y C, LI M. Nonlinear dynamic characteristics of marine rotor-bearing system under heaving motion［J］. Shock and Vibration, 2019, 2019: 1-16.
［12］钟一谔. 转子动力学［M］. 北京：清华大学出版社, 1987.
［13］李明, 李自刚. 完整约束下转子-轴承系统非线性振动［M］. 北京：科学出版社, 2014.
|
|
|
|
