Pad shimmy characteristics of tilting pad bearing in heavy duty gas turbine
FENG Yongzhi1,2, YAN Gang3, MENG Fangang2, JIN Yingze3, YUAN Xiaoyang3, CHEN Yunshu1
1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China;
2. Harbin Electric Co., Ltd., Harbin 150028, China;
3. MOE Key Lab for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China
Abstract：Taking the four tilting pad bearing as the research object, a dynamic analysis model of the tilting pad bearing pad shimmy characteristics is established, and the approximate analytical expression of the tilting pad oil film pressure is derived based on the variable separation method, and the Euler method is used to calculate The dynamic response of the tile was verified through experiments, and the correctness of the analytical model and analytical calculation method was verified. The influence of the preload coefficient on the swing characteristics of the tile was studied, and the swing angle response of the tile under step excitation was analyzed in detail. Circumstances, the research results show that applying a certain preload factor when a heavy-duty gas turbine is working can increase the dynamic load-carrying capacity of its tilting-pad bearings; the existence of a special pre-load factor between 0.5 and 0.8 will make the 1st and 3rd No. 4 tile has a maximum swing angle; by increasing the preload coefficient, the swing amplitude of each tile can be reduced by more than 90%; the swing frequency of each tile under different preload coefficients is the rotation frequency, but the upper tile Obvious frequency multiplication will appear when the preload coefficient is small. The research results can provide a reference for the diagnosis and treatment of tilting-pad bearing instability caused by pad vibration.
冯永志1，2，闫岗3，孟凡刚2，金英泽3，袁小阳3，陈予恕1. 重型燃气轮机可倾瓦轴承瓦块摆振特性研究[J]. 振动与冲击, 2021, 40(21): 127-134.
FENG Yongzhi1,2, YAN Gang3, MENG Fangang2, JIN Yingze3, YUAN Xiaoyang3, CHEN Yunshu1. Pad shimmy characteristics of tilting pad bearing in heavy duty gas turbine. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(21): 127-134.
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