CAJ | 학술논문

针对一台AV40轴流压缩机多次于振动突变造成停机而导致硝酸四合一机组无法正常启机的故障。通过分析轴流压缩机振动突变时刻的频谱、轴心轨迹等特征，结合故障发生的时刻及径向轴承特性分析，确诊发生油膜振荡引起油膜瞬间失稳是此次故障的主要原因。在总结油膜振荡故障现场消除方法的基础上，通过更换排气侧存在轻微磨损的径向轴承来减小轴承顶隙、提高轴承稳定性。最终的试车结果表明，上述检修措施简单、有效，其故障得到完全消除。
침대일태AV40축류압축궤다차우진동돌변조성정궤이도치초산사합일궤조무법정상계궤적고장。통과분석축류압축궤진동돌변시각적빈보、축심궤적등특정，결합고장발생적시각급경향축승특성분석，학진발생유막진탕인기유막순간실은시차차고장적주요원인。재총결유막진탕고장현장소제방법적기출상，통과경환배기측존재경미마손적경향축승래감소축승정극、제고축승은정성。최종적시차결과표명，상술검수조시간단、유효，기고장득도완전소제。
An AV40 axial compressor was repeatedly stopped running due to abruptly vibration and fluctuation in the process of starting and speeding up, which resulted in the starting failure of the four-in-one nitric acid unit. It was confirmed that the main reason of the fault was that there existed obvious oil-film oscillation to induce the oil-film instability in the moment, by means of analyzing features such as spectrum, orbit ,etc., combining with the time when the fault occurred and the characteristics of journal bearing. Based on the summary about the methods of eliminating the fault of oil-film oscillation in the field, the journal bearing with mild wear at the outlet side was replaced with a new one, so as to decrease the top clearance and improve the stability of the bearing. The final result of trail run of the compressor demonstrates that the maintainance measures above are simple and effective, and the fault of oil-film oscillation has been completely eliminated.