基于EMD的螺杆转子激光测量信号去噪算法研究  

Research on Denoising Algorithm of Laser Measurement Signal of Screw Rotor Based on EMD

作　　者：卜凡娜 杨赫然 孙兴伟[1,2] 董祉序 王海燕[3] 杜晓宇 BU Fan-na;YANG He-ran;SUN Xing-wei;DONG Zhi-xu;WANG Hai-yan;DU Xiao-yu(Key Laboratory of Numerical Control Manufacturing Technology for Complex Surfaces of Liaoning Province,Shenyang 110870,China;School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;Shenyang Baiyun Machinery Co.,Ltd.,Shenyang 110027,China;Aromatics Company,China National Petroleum Corporation Liaoyang Petrochemical Fiber Company,Liaoyang 111003,China)

机构地区：[1]辽宁省复杂曲面数控制造技术重点实验室,辽宁沈阳110870 [2]沈阳工业大学机械工程学院,辽宁沈阳110870 [3]沈阳白云机械有限公司,辽宁沈阳110027 [4]中国石油辽阳石油化纤公司芳烃公司,辽宁辽阳111003

出　　处：《机械工程与自动化》2020年第4期12-14,共3页Mechanical Engineering & Automation

基　　金：辽宁省自然科学基金计划指导计划项目(2019-ZD-0206)。

摘　　要：为去除螺杆转子激光测量信号中的噪声,提出一种EMD-β与改进小波阈值函数结合的去噪算法。首先利用经验模态分解(EMD)对螺杆转子的激光距离信号进行分解,用EMD-β寻找高频的固有模态函数(IMF),然后对高频的IMF进行改进小波阈值去噪,最后将去噪后的IMF和剩余的IMF进行信号重构得到去噪后的信号。经过仿真验证,此方法在激光距离信号的噪声去除中具有一定的使用价值。In order to remove the noise in the screw rotor laser measurement signal, a denoising algorithm combining EMD-β and improved wavelet threshold function is proposed. First, empirical mode decomposition(EMD) is used to decompose the laser distance signal of the screw rotor, and EMD-β is used to find the high-frequency inherent mode function(IMF). Then, the high-frequency IMF is denoised by improved wavelet threshold. Finally, the denoised IMF and the remaining IMF are reconstructed to obtain the denoised signal. After simulation verification, this method has certain use value in removing the noise of the laser distance signal.

关 键 词：经验模态分解 改进小波阈值函数 去噪 螺杆转子 激光测量信号 

分 类 号：TN911.73[电子电信—通信与信息系统]