摘要
在大型旋转机械中 ,由于疲劳等因素会使转子中产生许多裂纹。通过大量的数值模拟 ,分析了包含横向裂纹时 ,汽轮机转子 Jeffcott模型的非线性动力学行为 ;对比了不同过临界转速时所采取的加速度方案和裂纹法向与不平衡质量间夹角对转子横向振动产生的不同影响 ;重点分析了裂纹转子在过临界转速时的频谱特性和最大共振峰随裂纹深度的变化规律 ;并讨论了在亚临界和超临界转速时 ,裂纹转子的时频响应特性 ;提出了 3种新的诊断转子裂纹的简便方法。图 1 1参
In large rotating machines, the crack may be produced as a result of the inherent flaows or fatigue load. In this paper, the nonlinear dynamical behavior of a horizontal Jeffcott rotor system with a transverse crack is analyzed numerically. The influence of different crack assumption, depth of crack, acceleration scheme and the angle between crack centerline and unbalenc are considered. Particular stress is laid on the analysis of the spectrum of transient and stable response. When the rotor is passing through the critical speed, the varitation regularity of maximum resonance peak with crack size is also obtained. At the same time, the influence of crack on the vibration amplitude is considered in both sub and supercritical speed ranges. In the end, three new simple methods are sugested for the fault diagnosis of cracked rotor systems. Figs 11 and refs 8.
出处
《动力工程》
CAS
CSCD
北大核心
2001年第2期1099-1104,1179,共7页
Power Engineering
基金
国家自然科学基金资助项目 !(重大 19990 5 10 )
