The Techniques of Rotordynamic Analyses of Pumps

• 作者: Frédéric Gaulard Joachim Schmied Andreas Fuchs Chuan-yue Zhou
• 来源期刊: 风机技术
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Structural Mechanics Analysis
• 页码范围: 67-76
• 页数: 10页
• 语种: 中文
• DOI: 10.16492/j.fjjs.2021.03.0008

摘要

State of the art analyses for the rotordynamic assessment of pumps and specific requirements for the simulation tools are described. Examples are a horizontal multistage pump with two fluid film bearings in atmospheric pressure, a horizontal submerged multistage pump with many bearings and a submerged vertical single-stage pump with water lubricated bearings.Due to the seals the rotor of the horizontal pump on two bearings is statically overdetermined and the static bearing forces depend on the deflection in the seals and the bearing. The nonlinear force displacement relation in the bearings hereby is considered.The stability of pumps is assessed by Campbell diagrams considering linear seal and bearing properties. Cylindrical bearings can have a destabilising effect in case of low loads as in the examples of the submerged pumps. For the pump with many bearings the influence of the bearing ambient pressure and of the bearing specific load on the stability is analysed. For the vertical pump the limit cycle, i.e. the vibration level of stabilisation, is determined with a nonlinear analysis. All examples have a practical background from engineering work, although they do not exactly correspond to real cases. Analyses were performed with the rotordynamic software MADYN 2000 [1].