一种应用改进符号序列熵与滑动窗奇异值的退化特征提取方法  

A kind of degradation feature extraction using improved symbolic sequence entropy and sliding window singular value

作　　者：王微[1] 王冰 胡雄[1] 孙德建[1] 张道兵 WANG Wei;WANG Bing;HU Xiong;SUN De-jian;ZHANG Dao-bing(Logistics Engineering College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学物流工程学院,上海201306

出　　处：《振动工程学报》2021年第1期211-218,共8页Journal of Vibration Engineering

基　　金：国家高新技术研究发展计划(863)资助项目(2013A20411606);国家自然科学基金资助项目(31300783);中国博士后科学基金资助项目(2014M561458)。

摘　　要：为了准确跟踪岸桥关键部件的性能退化状态,提出一种基于改进符号序列熵与滑动窗奇异值的在线退化特征提取方法。针对岸桥工况特殊、振动随机冲击频繁的特点,引入阈值因子并改进序列符号化方法,在保留方向变化信息的同时兼顾"粗粒化"的幅值变化信息,从而提高符号序列熵滤除随机冲击、刻画振动信号复杂度大小的能力。在线计算振动信号的改进符号序列熵,结合滑动窗方法,循环提取改进符号序列熵序列的奇异值,以此作为岸桥关键部件的在线退化特征。分别采用来自上海港集装箱码头的起升减速箱与轨道铰点的全寿命振动信号进行实例分析,结果表明:滑动窗奇异值能够刻画起升减速箱和轨道铰点的性能退化程度,退化程度越深,取值越大;并且具有计算稳定、快速的优点,能够为准确跟踪并评估健康状态奠定方法基础。In order to track performance degradation condition of shore bridge key components accurately,an online degradation feature extraction method based on improved symbol sequence entropy and sliding window singular value is proposed.In view of the special character of the shore bridge and the frequent random vibration impact,a threshold factor is introduced and the sequence symbolization method is improved.The information of the amplitude change of the"coarse grain"is also taken into account while retaining the direction information,thereby,improving the ability of filtering impact and characterizing signal complexity.The improved symbol sequence entropy of the vibration signal is calculated online,combining with the sliding window method,the singular value of the improved sequence entropy sequence is extracted cyclically,which is used as the online degradation feature of the key components of the shore bridge.The full-life vibration signals from the lifting gearbox and track hinge point of Shanghai Port Container Terminal are used to analyze the results.The results show that the sliding window singular value can describe the performance degradation degree of the lifting gearbox and track hinge point.The deeper the degradation degree is,the larger the singular value is.It has the advantages of stable and fast calculation.It can also lay a method foundation for accurately tracking and evaluating health status.

关 键 词：信号处理 岸桥 退化特征提取 符号序列熵 奇异值分解 

分 类 号：TN911.7[电子电信—通信与信息系统] TH132.4[电子电信—信息与通信工程]