变周期信号的时域同步平均新算法  

A algorithm of time domain averaging for fluctuant-period signal

作　　者：邵毅敏[1] 周晓君[1] 欧家福[2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]中国汽车工程研究院,重庆400039

出　　处：《振动工程学报》2009年第5期497-502,共6页Journal of Vibration Engineering

基　　金：国家自然基金资助项目(50675232);教育部科学技术研究重点资助项目(106139);重庆市自然基金重点资助项目(2007BA6021)

摘　　要：齿轮箱的转速受载荷和电压等的影响将会出现波动。无外时标采样时,用时域同步平均的传统算法处理转速波动的齿轮箱振动信号的降噪问题非常困难,提出变周期信号的时域同步平均新算法来解决这个问题。即利用转速波动的频域估计法确定同步平均的信号周期,再利用谱分析法计算数据长度,将变周期信号转换成周期信号进行时域同步平均。变周期信号时域同步平均新算法,不仅可省略外时标触发装置,而且可以改善由于转速波动引起的相位累积误差效应。模拟仿真和齿轮箱实验结果表明,该方法提高了信噪比,改善了相位累积误差。The speed of gearbox varies with the voltage and the load, and without the tachometer Time Domain Averaging is not available in processing the speed fluctuation vibration signal. To solve the problem, a new algorithm of Time Domain Averaging for the Fluctuant-Period signal is proposed in this paper. Though the frequency domain estimating, the real length for the segment of signal, which is relevant to recursively every cycle, can be obtained. By resampling the segments, the fluctuant-period signal can be turned into period signal. The new method can suppress the phase error accumulation effectiveness when using for processing the Fluctuant-Period vibration signal without tachometer. Simulation and experiment results have shown that the new algorithm is an excellent method for extracting periodic signal from speed fluctuation signal.

关 键 词：信号处理 变周期信号 振动信号 时域平均 

分 类 号：TN911.7[电子电信—通信与信息系统] TB533.1[电子电信—信息与通信工程]