基于改进峰值搜索法的旋转机械瞬时频率估计  

Instantaneous frequency estimation of a rotating machinery based on an improved peak search method

作　　者：胡爱军[1] 朱瑜[1] 

机构地区：[1]华北电力大学机械工程系,河北保定071000

出　　处：《振动与冲击》2013年第7期113-117,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(11072078);中央高校基本科研业务费专项资金资助

摘　　要：提出用于提取转子瞬时频率的改进峰值搜索法,并将该方法应用于旋转机械阶比跟踪。将瞬时频率中相邻两点一阶导数差值作为搜索峰值是否合理的判别条件,可避免传统峰值搜索法在干扰信号作用下提取虚假峰值,能提高瞬时频率估计精度。仿真实验表明,该方法能降低干扰信号对瞬时频率提取影响,效果优于传统峰值搜索法。用该方法对实测转子升速振动信号进行阶比分析,效果良好。An improved peak search method used to extract instantaneous frequencies of a rotor was proposed, and this method was used for order tracking of a rotating machinery. With the improved peak search method, the difference between the first derivatives of the adjacent points in the instantaneous frequencies was considered as the criterion to determine whether the searched peak was reasonable and to avoid the false peaks extracted with the traditional peak search method, the instantaneous frequency estimation accuracy could be improved. Simulation results showed that the improved peak search method can reduce the effect of interference signals on the instantaneous frequency extraction, the proposed method is better than the traditional peak search method. With this method, the vibration signal of a rotor speeding up was analyzed, and good results were obtained.

关 键 词：改进 峰值搜索 瞬时频率 阶比跟踪 

分 类 号：TH[机械工程]