不确定性激励下碰摩转子的振动响应识别  

Identification of the vibration responses of a rub-impact rotor under uncertain excitations

作　　者：王威 甘春标[1] WANG Wei;GAN Chunbiao(School of Mechanical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学机械工程学院

出　　处：《振动与冲击》2019年第18期122-127,200,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11772292;91748126)

摘　　要：应用伪周期替代数据算法分析受不确定性激励的碰摩故障转子振动响应,对故障信号进行识别和分类。在考虑非线性油膜力及碰摩力作用的基础上,建立有界噪声激励作用下碰摩故障转子系统动力学模型,对系统振动响应信号及其相应替代数据进行对比分析与识别,应用关联维数作为检验假设的判别统计量,并结合Poincaré截面图、最大Lyapunov指数及分岔图进行验证。结果表明,替代数据算法能够有效识别此类受随机不确定激励转子系统的周期占优与混沌占优响应信号,可进一步应用于受不确定性激励转子系统的信号识别与故障诊断研究。A pseudo-periodic surrogate algorithm was introduced to analyze the vibration responses of a rub-impact rotor system under uncertain excitations,and the faulty signals were identified and classified.The dynamic model of the rub-impact rotor under the bounded noise excitation was established,where the nonlinear oil-film force and the rub-impact force were also taken into account.Then,the surrogate data of the responses of the system were generated via the pseudo-periodic surrogate algorithm,and the correlation dimensions of the original responses were compared with those of their corresponding artificial data.Meanwhile,the Poincarécross-section portrait,the leading Lyapunov exponent and the bifurcation diagrams were employed to validate the predictions.The results show that,the pseudo-periodic surrogate algorithm can effectively identify the periodic-dominant and chaotic-dominant response signals,and can be further applied to the signal identification and fault diagnosis of rotor systems under uncertain excitations.

关 键 词：JEFFCOTT转子 不确定性激励 碰摩 替代数据法 信号识别 

分 类 号：TH113[机械工程—机械设计及理论]