关键词: 振动与波, 离心压缩机, 油膜振荡, 频谱, 检测

Abstract: The fault of oil membrane oscillation in a centrifugal compressor of a factory in Longyan of Fujian province is analyzed. It is found that this fault is a particular one of sliding bearings operating at high rotation speeds. It usually occurs in the vicinity of twice critical rotation speed of the bearings. The characteristics of oil membrane oscillation are summarized. It is found that the first-order critical frequency component of the rotor in the frequency spectrum is the main peak value, and the locus of the bearing’s shaft is irregular and diffusive. The influential factors of oil membrane oscillation are analyzed. It is concluded that the oil membrane oscillation depends on the load, the critical speed, the bearing’s eccentricity, lubrication state, and bearing’s load characteristic coefficient. Then, the HHT method for the fault detection is proposed. It is found that with this method, the fault of oil membrane oscillation can be identified very quickly and precisely. Finally, some structural improvement measures for the centrifugal compressor are proposed for reducing the oil membrane oscillation. It is verified after half-year use that this method is simple, convenient and practical.

Key words: vibration and wave, centrifugal compressor, oil membrane oscillation, frequency spectrum, detection