摘要
为了有效降低振动信号误差以提高数据的可信度,先针对花岗岩爆破试验中的加速度零漂信号,使用集合经验模态分解(ensemble empirical mode decomposition,EEMD)与高低频处理相结合的方法进行修正;接着,根据信号冲击响应谱提出表征修正前后频域平均偏差幅度的修正指数;最后,基于频域和时域分别讨论了不同白噪声系数范围内信号的修正效果。分析表明:EEMD方法能够有效地消除爆破加速度信号的零漂现象,但对积分后速度信号的零漂趋势改善有限;随着白噪声系数增大,不同频段上修正指数均不同程度地增大,二者呈现幂指数关系;根据不同频段上的修正指数分析,可以确定不同零漂加速度信号对应的最优白噪声系数范围。本文提出的修正指数可为EEMD方法处理加速度零漂信号时白噪声系数的合理选取提供参考。
To reduce the deviation of vibration signals effectively and improve the reliability of the data, the method of combining the ensemble empirical mode decomposition(EEMD) and the processing of high and low frequency is first applied to correct the acceleration zero-drift signals collected in the blasting test of granite. Then, according to the shock response spectrum of vibration signals, a correction index is proposed to characterize the average deviation amplitude of the frequency domain between the original and the corrected signals. Finally, the correction effects of signals in different white noise coefficients are discussed based on the frequency domain and the time domain. The analysis shows that the EEMD method can effectively eliminate the zero-drift phenomenon of the acceleration signal, but the improvement of zero-drift trend of the velocity signal after integration is limited. With the increase of the white noise coefficient, the correction indices in different frequency bands increase to varied extents, and the power exponent relationship is presented between them. According to the modified exponential analysis in different frequency bands, the optimal white noise coefficient range corresponding to different acceleration zero-drift signals can be determined. The correction index proposed in this study can provide a reference for the reasonable selection of white noise coefficient when EEMD method is used to process the zero-drift signal of acceleration.
作者
王志亮
陈贵豪
黄佑鹏
WANG Zhiliang;CHEN Guihao;HUANG Youpeng(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2019年第8期145-155,共11页
Explosion and Shock Waves
基金
国家自然科学基金（51579062,51379147）
关键词
爆破信号
零漂
EEMD
白噪声系数
冲击响应谱
修正指数
blasting signal
zero-drift
EEMD
white noise coefficient
shock response spectrum
correction index
