簸箕型流道泵站水泵振动信号消噪方法研究  

Study on Noise Elimination Method of Pump Vibration Signal in Pumping Station with Dustpan Channel

作　　者：李彦迪 王昱[2] LI Yandi;WANG Yu(Ningxia Guhai Water Pumping Management Office,Zhongning 755199,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]宁夏固海扬水管理处,宁夏中宁755199 [2]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《机械制造与自动化》2024年第5期92-96,共5页Machine Building & Automation

摘　　要：为解决水泵信号振源复杂、含噪量大,难以在信号内获得有效数据的问题,研究一种基于改进平移不变量小波阈值的振动信号消噪方法。将水泵振动信号划分为信号高频区域和低频区域,选取对应合适的小波范围,在小波分解层数作用下正交变换含噪信号。利用阈值限制小波系数完成滤波,通过设定噪声标准偏差值,求得振动信号小波系数中间值,实现信号重构。将振动信号含噪部分在时域空间完成循环平移,填补信号不连续缺陷部位,平移去噪后计算振动信号平均值,得到最终消噪振动信号。仿真分析结果显示:该方法在平移不变量的辅助下,可填补信号不连续缺陷点,从噪声中恢复出原始振动信号,波形的失真较小,信号信噪比较高,鲁棒性好,可完整地保存信号的轮廓和特征。为分析簸箕型进水流道内部流态提供新思路,保证水泵整体工作可靠性。To cope with the complexity of vibration sources,large quantity of noise content and difficulty in obtaining the effective data of pump signal,a vibration signal denoising method based on improved translation invariant Langmuir wavelet threshold is studied.The pump vibration signal is divided into high frequency region and low frequency region,the corresponding appropriate wavelet range is selected,and the noisy signal is transformed orthogonally under the effect of wavelet decomposition levels.The simulation results show that the method,with the help of translation invariants,can remedy the discontinuous defect points of the signal,recover the original vibration signal from the noise,and abtain small waveform distortion,high signal signal-to-noise ratio,good robustness and fully preserved contour and characteristics of the signal,which provides a new idea for analyzing the internal flow pattern of dustpan type inlet passage and ensures the overall working reliability of pump.

关 键 词：振动信号消噪 水泵振动 小波系数 正交变换 平移不变量 

分 类 号：TH38[机械工程—机械制造及自动化]