Calculation of Rotor's Torsional Vibration Characteristics Based on Equivalent Diameter of Stiffness

2010 ◽  
Author(s):  
Wang-fan Li ◽  
Dan-mei Xie ◽  
Yong Qian ◽  
Xian-bo Zhao ◽  
Sun Cai ◽  
...  
Keyword(s):  
Torsional Vibration ◽  
Vibration Characteristics ◽  
Equivalent Diameter

scholarly journals Torsional vibration characteristics analysis of DFIG-based wind farm and its equivalent model

2017 ◽  
Vol 12 (5) ◽  
pp. 646-656
Author(s):  
Da Xie ◽  
Junbo Sun ◽  
Yupu Lu ◽  
Yucheng Lou ◽  
Chenghong Gu ◽  
...  
Keyword(s):  
Torsional Vibration ◽  
Wind Farm ◽  
Vibration Characteristics ◽  
Equivalent Model ◽  
Characteristics Analysis

The coupled effect of bearing misalignment and friction on vibration characteristics of a propulsion shafting system

2017 ◽  
Vol 233 (1) ◽  
pp. 150-163 ◽  
Author(s):  
Wenyuan Qin ◽  
Hui Qin ◽  
Hongbo Zheng ◽  
Zhiyi Zhang
Keyword(s):  
Torsional Vibration ◽  
Water Film ◽  
Vibration Characteristics ◽  
The Finite Element Method ◽  
Heavy Load ◽  
Runge Kutta Method ◽  
Coupled Effect ◽  
Rubber Bearing ◽  
Rubber Bearings ◽  
Mode Truncation

The propulsion shafting system of ships is usually supported, in part, by water-lubricated rubber bearings, which often work at mixed or boundary lubrication state under heavy-load and low-speed conditions, resulting in strong friction on the bearing–shaft interface and even abnormal vibration in the overall system. In addition, bearing misalignment can further affect the distribution of friction and consequently change the lateral and torsional vibration characteristics of the shafting system. In this work, the rubber bearing was simplified into parallel-distributed springs and the water film was neglected. The dynamic model of the propulsion shafting system was built with the finite element method and reduced by mode truncation. The coupled effect of bearing misalignment and friction was subsequently analyzed with this reduced model and the fourth-order Runge–Kutta method. Finally, lateral and torsional vibration characteristics of the overall system under different bearing misalignment were obtained, which can be used in the identification or diagnosis of abnormal vibration induced by friction.

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