Method of De-noising and Modulation in Vibration Signal Based on Mathematical Morphology
-
摘要: 在齿轮箱的故障诊断中,为同时实现对齿轮故障信号的降噪和解调,依据数学形态学理论,设计了两种不同的形态运算:形态组合运算和形态差值运算。可根据信号处理的不同目的,实现含噪信号的降噪和调制信号的解调。对仿真信号和实测齿轮裂纹故障信号的分析结果表明:形态组合运算可抑制信号中的脉冲及随机噪声,提高信噪比,实现信号的降噪处理;而形态差值运算可提取信号中的调制脉冲,充分突出故障信号的冲击特征。Abstract: During the fault diagnosis in gearbox, in order to achieve de-noising and demodulation simultaneously in the fault gear vibration signal, two different morphological operators are designed based on the mathematical morphological theory. For different signal processing purpose, the vibration signal can be de-noised and modulated with morphological operators. The procession results of simulated signal and real gear crack fault signal show that the combined operation can filter the impulse and stochastic noises, and improve signal-to-noise ratio, while the difference operation can extract the demodulated impulses in the signal, and reveal impulsion feature in fault signal. The proposed method is simple and fast in computation as only addition and subtraction operators are need. This method can be applied to the singal processing in online diagnosis for gearbox.
-
Key words:
- fault diagnosis /
- de-noising /
- demodulation /
- mathematical morphology /
- impulsion feature
-
[1] 童进,吴昭同等.旋转机械信号采集中的一种脉冲剔除方法[J].振动、测试与诊断,2000,20(3):216～217 [2] 郑海波,李志远,陈心昭.基于连续小波变换的齿轮故障诊断方法研究[J].机械工程学报,2002,38(3):69～73 [3] 吴虎胜,吕建新等.基于ISVD和小波降噪理论的轴承故障诊断[J].轴承,2011,(2):48～51 [4] 张家凡.振动信号的包络解调分析方法研究及应用[D].武汉:武汉理工大学,2008 [5] 丁康,江利旗.解调分析在机械振动信号分析中应用的局限性研究[J].机械科学与技术,2000,19(5):722～725 [6] 沈路,杨富春等.基于改进EMD与形态滤波的齿轮故障特征提取[J].振动与冲击,2010,29(3):154～157 [7] Stevenson R L,Arce G.Morphological filters:statistical and fur-ther syntactic properties[J].IEEE Transactions on Circuitsand Systems,1987,34(11):1292～1305 [8] 杜必强,唐贵基,石俊杰.旋转机械振动信号形态滤波器的设计与分析[J].振动与冲击,2009,28(9):79～81 [9] 赵春晖.数字形态滤波器理论及其算法研究[M].北京:高等教育出版社,2002 [10] 张文斌,杨辰龙,周晓军.形态滤波方法在振动信号降噪中的应用[J].浙江大学学报(工学版),2009,43(11):2096～2099 [11] 崔屹.图像处理与分析——数学形态学方法及应用[M].北京:科学出版社,2000 -
点击查看大图
计量
- 文章访问数: 159
- HTML全文浏览量: 19
- PDF下载量: 6
- 被引次数: 0
下载:
