Vibration fault features of the rotor with cracks under steam flow-exciting force of a marine steam turbine
WENG Lei1,ZHANG Lei2
1.No.91404, Unit of PLA, Qinhuangdao 066000, China;
2.Institute of High Temperature Structural Composite Materials for Naval Ship,Naval University of Engineering,Wuhan 430033,China
Abstract: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.
瓮雷1,张磊2. 考虑汽轮机汽流激振时裂纹转子的振动特性研究[J]. 振动与冲击, 2020, 39(22): 137-142.
WENG Lei1,ZHANG Lei2. Vibration fault features of the rotor with cracks under steam flow-exciting force of a marine steam turbine. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(22): 137-142.
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