汽流激振力下转子裂纹-碰摩振动故障研究  

Research on Vibration Fault Features of a Rotor under Steam Flow-Exciting Force with Coupling Faults of Crack and Rub-Impact

作　　者：瓮雷 向智玮 WENG Lei;XIANG Zhi-wei(No.91404 Unit of PAL,Heibei Qinghuangdao 066000,China;No.91910 Unit of PAL,Liaoning Dalian 116000,China)

机构地区：[1]91404部队,河北秦皇岛066000 [2]91910部队,辽宁大连116000

出　　处：《机械设计与制造》2021年第8期91-94,98,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金项目(51509254);武器装备预研基金项目(9140A27030514JB11449);海军工程大学自然科学基金项目(HGDQNJJ13013)。

摘　　要：针对汽轮机机组在运行过程中出现的振动故障问题,在考虑汽流激振力情况下建立了转子系统故障分析模型。通过数值分析方法,对转子故障模型进行了研究分析。结果表明:在综合考虑汽流激振力作用下多种非线性因素作用时,碰摩转子系统在临界转速的混沌区域明显减小,并出现有幅值较大的1/4、3/4倍频。当裂纹深度增加时,故障转子系统的混沌区域逐渐减小;在超临界转速区域系统响应呈现出较长的周期3运动,频谱图上主要体现为3/4、2倍频。研究结果为进一步的故障问题分析诊断提供一定的理论依据。The nonlinear dynamic model of rotor with crack and rub was established for research of diagnosis in rotor system with coupling faults under Steam flow-exciting Force of Stream Turbine.Numerical method is adopted to investigate the nonlinear dynamic response by the corresponding bifurcation diagrams,Poincare maps and frequency spectra.The results indicate that,the chaotic motion region of the rotor with rub-impact fault decreases near the critical speed,and there are some low frequencies with large amplitude at 1/4X and 3/4X-ratational speed,when considering various nonlinear factors under Steam flow-exciting Force of Stream Turbine.Moreover,as the crack depth increase,the chaotic motion region of rotor system with coupling faults of crack and rub-impact reduce gradually and there is a long region for period three in the supercritical speed domain,and the spectrum diagram of system response is mainly for 3/4X and 2X-ratational speed.It indicated that this research may contribution to further understanding of the failure mechanism of such a rotor-bearing system.

关 键 词：转子 汽流激振力 裂纹 碰摩 

分 类 号：TH16[机械工程—机械制造及自动化]