Analytical study on axial free vibration and forced vibration of dry gas seal based on Laplace transform
TENG Liming1, JIANG Jinbo1, PENG Xudong1, CHEN Yuan1,2, LI Jiyun1
1.College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2.College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, China
Abstract:The shaft vibration of high-speed rotating equipment brings great challenges to the stable operation of dry gas seal. The explicit analytical expressions of axial free vibration, forced vibration displacement response and its corresponding periodic peak of dry gas seal are derived based on Laplace transform. The influence of floating ring mass, excitation frequency, stiffness and damping parameters on the performance in the transition stage of axial free vibration, and the periodic peak of axial forced vibration are investigated. The results show that in the axial free vibration of dry gas seal, the total axial damping of the system plays a decisive role. The effects of the floating ring mass and the total axial stiffness of the system on the free vibration characteristics of the seal are obviously different under the condition of overdamping and underdamping. In the forced vibration of dry gas seal, the excessive spring stiffness and auxiliary seal damping are not conducive to the tracking property of dry gas seal. Larger axial gas film damping and larger axial gas film stiffness when exceeding a certain threshold are beneficial to the tracking property of dry gas seal. The research results provide theoretical guidance for dynamic stability evaluation and structure design of dry gas seal.
Key words: Dry gas seal; Laplace transform; Vibration property; Analytical solution
滕黎明1,江锦波1,彭旭东1,陈源1,2,李纪云1. 基于Laplace变换的干气密封轴向自由振动与强迫振动解析研究[J]. 振动与冲击, 2022, 41(21): 148-160.
TENG Liming1, JIANG Jinbo1, PENG Xudong1, CHEN Yuan1,2, LI Jiyun1. Analytical study on axial free vibration and forced vibration of dry gas seal based on Laplace transform. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(21): 148-160.
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