基于ITS与多重分形的传动箱状态识别
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摘要
实验采集的传动箱振动信号受噪声干扰严重,难以直接通过信号的多重分形特征参量来区分不同工况,为此,采用ITS降噪及微弱特征提取方法,计算了降噪后传动箱正常运转、润滑不良及基座松动3种状态下的多重分形谱参数,对特征提取后信号从局部到整体、从渐进态到最终态的微变化过程进行了定量描述,并由这些特征值的敏感性判断了系统状态类别。
Because the vibration signals of transmission box collected from actual test is seriously interfered by noise,different working conditions cannot be distinguished through the multi-fractal characteristics directly.So ITS noise reducing and weak feature extraction method are used to calculate multi-fractal spectrum parameters of transmission box under normal operation,poor lubrication and pedestal looseness states.Quantitative description of the micro change process of signals ranging from partial to whole,from the progressive state to the final state are given after feature extraction,and the system status categories are judged by the eigenvalue sensitivity.
Because the vibration signals of transmission box collected from actual test is seriously interfered by noise,different working conditions cannot be distinguished through the multi-fractal characteristics directly.So ITS noise reducing and weak feature extraction method are used to calculate multi-fractal spectrum parameters of transmission box under normal operation,poor lubrication and pedestal looseness states.Quantitative description of the micro change process of signals ranging from partial to whole,from the progressive state to the final state are given after feature extraction,and the system status categories are judged by the eigenvalue sensitivity.
引文
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[10]钟明寿,龙源,谢全民,等.基于分形盒维数和多重分形的爆破地震波信号分析[J].振动与冲击,2010,29(1):7-11.
[2]于功志,关德林,段树林.基于多重分形的齿轮故障特征提取方法[J].大连海事大学学报,2009,35(1):111-114.
[3]陈亦望,徐鑫,傅强.基于多个无标度区的多重分形分析方法[J].计算物理,2010,27(6):905-911.
[4]罗颂荣,程军圣,郑近德.基于ITD分形模糊熵的轴承早期故障诊断[J].振动、测试与诊断,2013,33(4):706-711.
[5]李雪.基于固有时间尺度分解的数字调制识别[D].西安:西安电子科技大学,2010.
[6]杨宇,王欢欢,喻振涛.基于ITD改进算法和关联维数的转子故障诊断方法[J].振动与冲击,2012,31(23):67-70.
[7]刘元峰,赵玫.混沌时间序列的一种降噪算法[J].机械科学与技术,2003,22(4):538-539.
[8]卢德林,郭兴明.基于奇异谱分析的心音信号小波包去噪算法研究[J].振动与冲击,2013,32(18):63-69.
[9]刘超,马振书,孙华刚,等.基于ITD与SSA的传动箱信号降噪及微弱特征提取[J].装甲兵工程学院学报,2014,28(5):77-81.
[10]钟明寿,龙源,谢全民,等.基于分形盒维数和多重分形的爆破地震波信号分析[J].振动与冲击,2010,29(1):7-11.
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