基于包络角域加窗同步平均太阳轮故障特征提取  

Feature extraction of faulty sun gear signals based on the envelope windowed synchronous average in angle domain

作　　者：王志乐 郭瑜[1] 伍星[1] 

机构地区：[1]昆明理工大学机电工程学院云南省高校振动与噪声重点实验室,昆明650500

出　　处：《振动与冲击》2017年第21期60-64,71,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675251)

摘　　要：行星齿轮箱广泛应用于风电机组等大型装备中,其振动特征提取在故障诊断领域有重要意义。但由于存在非平稳、调制、传递路径复杂、传递路径具有时变特性等特点,导致故障响应微弱,往往被强背景噪声所湮没。主要针对包络分析、加窗同步平均、计算阶比跟踪相结合,提出了一种适合弱特征信号解调、时变传递路径及变速工况的包络角域加窗同步平均技术。Tukey窗函数对故障振动信号进行加窗处理,希尔伯特变换(Hilbert)获取故障复包络信号,计算阶比跟踪对复包络信号进行等角度重采样,转换为准平稳角域信号,然后进行同步平均。该方法对太阳轮故障实测振动信号进行分析,实验结果表明,所提出方法能够有效地提取太阳轮故障的特征信息。Planetary gearboxes are widely used in wind turbines and other large machinery. Due to the nonstationary characteristic of signals,the modulation as well as the complexity and time-varying property of its transmission path,the fault response signals,usually quite weak,are easily submerged in the strong background noise. By the combined use of the envelope analysis,windowed synchronous average and computed order tracking,an envelope windowed synchronous average in angle domain, suitable for the weak feature signals demodulation, time-varying transmission paths and varying-speed working conditions was proposed. In the method,fault vibration signals were dealt with by using the tukey window function,the Hilbert transform（ HT） was used to obtain the complex envelope signals and the complex envelope signals in time domain were sampled at constant angle increments according to the computed order tracking（ COT）,which converts the non-stationary signals in the time domain into the stationary ones in the angle domain. Then,the angle-domain signals were processed by the signal synchronous average（ SA）. Experimental tests were conducted to verify the validity of the proposed method.

关 键 词：行星齿轮箱 包络分析 加窗同步平均 计算阶比跟踪 

分 类 号：TH133.33[机械工程—机械制造及自动化]