冲击信号零漂修正的冲击响应谱互相关系数分析  

Baseline correction of impact signals using the cross-correlation coefficient of shock response spectrum

作　　者：李海广[1,2] 潘宏侠[1] 任海锋[1] 

机构地区：[1]中北大学机电工程学院,太原030051 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,包头014010

出　　处：《振动与冲击》2016年第16期219-225,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51175480)

摘　　要：冲击振动信号通常因为冲击能量强、传感器特性等因素的影响,存在基线漂移现象,进而影响到后续的数据分析处理。针对这一问题,首先通过计算冲击信号的冲击响应谱,提出正负冲击响应谱互相关系数的定义,利用互相关系数开展检测基线漂移程度、检验修正效果等工作;其次,提出利用响应谱互相关系数为重构条件的自适应经验模式分解(EMD)漂移修正新方法,并与其他方法进行了比较。在对某机枪自动机动作过程中的冲击振动基线漂移信号分析和验证,数据结果表明,冲击响应谱互相关系数较传统的响应谱低频斜率等响应谱特征值,更能准确有效的表征基线漂移程度、以及修正效果的评判。The baseline shift components in the impact vibration signals are associated with the high impact energy and sensor characteristics and they influence data analysis.This paper presented a new method for detecting the shifted baseline level and correction of the baseline shift.The proposed method was based on the cross-correlation coefficient between the positive shock response spectrum and the negative shock response spectrum.The new method for the baseline correction of impact vibration signal which represents the reconstruction of signal was realized by using the empirical mode decomposition（EMD）based on the cross-correlation coefficient.The validity and precision of the proposed method was demonstrated with analysis and validation of the signals generated in the operation process of an automation gun .

关 键 词：基线漂移 冲击响应谱 互相关系数 经验模式分解 

分 类 号：TJ06[兵器科学与技术—兵器发射理论与技术]