油膜涡动故障频率特征试验的研究.pdfVIP

油膜涡动故障频率特征试验研究 * 胡爱军，向玲，唐贵基 （华北电力大学机械工程系，河北保定 071003 ） 摘要：通过转子升速试验模拟了油膜涡动的发生、发展到油膜振荡的完整过程，采用HHT分析得 到了转子升速过程油膜失稳故障数据的Hilbert谱，分析了油膜涡动频率与转子回转频率的关 系。半速涡动频率约为回转频率的42%～48%之间，这一统计规律的具体数值应该与转子系统特 性有关，随着转速升高，油膜涡动频率跟随回转频率变化；即使在同一转子系统，油膜涡动频 率与回转频率之间的系数关系也是不固定的，随转速升高呈现逐渐加大趋势。实验与分析的结 果对研究转子油膜失稳故障有重要意义。 关键词：油膜涡动 频率 Hilbert—Huang变换 故障 Experimental Study on frequency characteristics of oil whirl 1 Hu Aijun, Xiang Ling, Tang Guij ( Mechanical Engineering Department, North China Electric Power University, Baoding, Hebei Pro. 071003, China.) Abstract: An experiment of oil film instability fault (oil whirl and oil whip) carried on rotor kit, the whole process from stable running to oil whirl and then the emerging of oil whip recorded by rotor run-up test. The Hilbert spectrums of oil film instability calculated by Hilbert-Huang transform. The relationship between whirl frequency and rotating speed analyzed in this paper. According to statistics, the ratio of whirl frequency to rotating speed is 42～48 percent. The experiment results showed that the exactly ratio is related to characteristics of rotor system. Whirl frequency followed rotating speed, but even in the same rotor system, the ratio is unfixed in different speed, it was increased with rotating speed raise. The results of experiments are helpful to the study of oil film instability fault. Key words: oil whirl; frequency; Hilbert-Huang transform; fault 率的42%～48%之间，这一结论是目前为人们所熟知 引言1 的油膜涡动频率特征，但半速涡动频率如何变化，