基于包络角域加窗同步平均太阳轮故障特征提取

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (21) : 60-64.

论文

王志乐，郭瑜, 伍星

作者信息 +

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

Wang zhi-le, Guo Yu, Wu Xing

Author information +

文章历史 +

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。本文主要针对包络分析、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。首先Tukey窗函数对故障振动信号进行加窗处理，其次希尔伯特变换（Hilbert）获取故障复包络信号，最后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。

Abstract

Planetary gearboxes are widely used in wind turbines and other large machinery. The vibration feature extraction is particularly important in fault diagnosis. Due to non-stationary，modulation，and complex transmission path with time-varying characteristics, the fault response quite weak, are easily submerged by the strong background noise. By combing the envelope analysis, the windowed synchronous average and the computed order tracking, an envelope windowed synchronous average in angle domain suit for weak characteristic demodulation, the time-varying transmission paths and varying-speed working conditions is proposed in this paper. Firstly, the fault of variation is deal with tukey of window function. Secondly, Hilbert transform (HT) obtains the complex envelope signal. Finally, the complex envelope signal in time domain is sampled at constant angle increments according to computed order tracking (COT), which converts the non-stationary signal in the time domain into the stationary one in the angle domain. Then, the angle-domain signal is processed by signal synchronous average (SA). Tests were conducted to verify the validity of the proposed method.

导出引用

王志乐，郭瑜, 伍星. 基于包络角域加窗同步平均太阳轮故障特征提取[J]. 振动与冲击, 2017, 36(21): 60-64

Wang zhi-le, Guo Yu, Wu Xing. Feature extraction of faulty sun gear based on envelope windowed synchronous average in angle domain[J]. Journal of Vibration and Shock, 2017, 36(21): 60-64

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