关键词: 正交试验, 大型离心压缩机, 有限元法, 参数优化

Abstract: The selection of bearing parameters is one of the main influence factors on stability of rotor systems. To deal with this problem, parameter optimization design was presented based on orthogonal experiment, and it was applied in a low pressure cylinder rotor system of certain large-scale centrifugal compressor. By determining optimum bearing parameters, effect of bearing parameters (length-diameter ratio, clearance ratio, lubricating oil viscosity and preload) to bearing-rotor system stability and shaft vibration near bearing was comprehensively evaluated. The significant and non-significant factors influencing on system stability and journal vibration were determined by variance analysis and F test. These conclusions provided guidance to compressor rotor system design.

Key words: orthogonal experiment, large-scale centrifugal compressor, finite element method, parameter optimization, bearing