摘要
建立了非线性油膜力影响下不平衡-不对中-碰摩耦合故障的滑动轴承-转子系统动力学模型。模型中充分考虑了滑动轴承-转子系统中非线性油膜力的影响,并在此基础上建立了不平衡、不对中和碰摩故障耦合作用下的系统动力学模型,利用有限元分析方法获得系统振动响应。同时,在转子试验台上模拟耦合故障,获取实测信号与模型仿真响应进行对比分析。针对耦合故障振动响应中频率混叠的问题,提出一种微分耦合经验模态分解对系统响应进行分解,为各耦合故障征兆的获取提供基础。仿真与实验结果证明了耦合故障模型的准确性以及微分耦合经验模态分解的有效性。
A novel dynamic model of a sliding bearing-rotor system with unbalance- misalignment-rubbing coupled faults was established under influence of nonlinear oil film forces. In the model, the nonlinear oil film forces were fully considered, based on them the dynamic model of the system with coupled faults was established. Finite element analysis was utilized to obtain the vibration response of the system. Meanwhile, the tests with coupled faults were performed on a rotor test device, and the measured response signals were acquired and compared with the simulated responses of the model. Considering the frequency aliasing of vibration responses, the differential coupling EMD (DCEMD) was proposed and used to decompose the response signals. Simulation and test results verified the correctness of the proposed dynamic model and the effectiveness of DCEMD.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第23期159-165,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51079057
51039005)
水利部公益性行业科研专项(201001080)
