摘要
针对舰船汽轮机机组在运行过程中出现的振动故障问题。建立了考虑汽轮机汽流激振问题时转子裂纹故障分析模型,并采用数值仿真方法研究了汽流激振力、裂纹以及转子偏心量对系统振动特性的影响。研究结果表明:汽流激振力的存在使得系统的周期响应提前,并且在临界转速附近的混沌区间明显变窄;当考虑裂纹变化时,裂纹深度的不断增加,使得在临界转速附近的混沌响应减少甚至消失,并在超临界转速附近演变出较长区间的周期3运动;偏心量较小时汽流激振力对系统并没有大的影响,而随着偏心量的进一步增大,汽流激振力才会对系统有显著的影响;当偏心量增大到一定程度时,无论有无汽流激振力都对系统几乎没有影响,偏心量对系统的影响占据主导地位;研究结果可为进一步的故障问题分析诊断提供一定的理论依据。
The rotor model with faults under the steam flow-exciting force of a marine steam turbine was established,and the numerical method was adopted to analyse nonlinear vibration characteristics of the rotor system with cracks under steam flow-exciting force.The calculation results show that the occurance of dynamic periodic responses of the system advances,and the chaotic area near the critical speed is significantly narrower.When the crack depth is further increased,the chaotic area becomes smaller and almost disappears.When the eccentricity is small,the steam flow-exciting force will have little effect on the system,but as the eccentricity increases further,the steam flow-exciting force will have a significant impact on the system.As the amount of eccentricity is increased to a certain extent,the presence or absence of steam flow-exciting force has little effect on the system,and the influence of eccentricity on the system dominates.
作者
瓮雷
张磊
WENG Lei;ZHANG Lei(No.91404,Unit of PLA,Qinhuangdao 066000,China;Institute of High Temperature Structural Composite Materials for Naval Ship,Naval University of Engineering,Wuhan 430033,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第22期137-142,168,共7页
Journal of Vibration and Shock
基金
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)。
关键词
转子系统
汽流激振力
裂纹
非线性振动
rotor system
steam flow-exciting force
crack
nonlinear vibration
