Geotechnical engineering blasting:a new modal aliasing cancellation methodology of vibration signal de-noising  

作　　者：Yi Wenhua Yan Lei Wang Zhenhuan Yang Jianhua Tao Tiejun Liu Liansheng 

机构地区：[1]School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China [3]School of Civil Engineering,Guizhou University,Guiyang 550025,China

出　　处：《Earthquake Engineering and Engineering Vibration》2022年第2期313-323,共11页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant Nos.52064015 and 51404111;Jiangxi Provincial Natural Science Foundation under Grant No.20192BAB206017;Scientific Research Project of Jiangxi Provincial Education Department under Grant No.GJJ160643;the Program of Qingjiang Excellent Young Talents,Jiangxi University of Science and Technology under Grant No.JXUSTQJYX2016007。

摘　　要：In the present study of peak particle velocity(PPV)and frequency,an improved algorithm(principal empirical mode decomposition,PEMD)based on principal component analysis(PCA)and empirical mode decomposition(EMD)is proposed,with the goal of addressing poor filtering de-noising effects caused by the occurrences of modal aliasing phenomena in EMD blasting vibration signal decomposition processes.Test results showed that frequency of intrinsic mode function(IMF)components decomposed by PEMD gradually decreases and that the main frequency is unique,which eliminates the phenomenon of modal aliasing.In the simulation experiment,the signal-to-noise(SNR)and root mean square errors(RMSE)ratio of the signal de-noised by PEMD are the largest when compared to EMD and ensemble empirical mode decomposition(EEMD).The main frequency of the de-noising signal through PEMD is 75 Hz,which is closest to the frequency of the noiseless simulation signal.In geotechnical engineering blasting experiments,compared to EMD and EEMD,the signal de-noised by PEMD has the lowest level of distortion,and the frequency band is distributed in a range of 0-64 Hz,which is closest to the frequency band of the blasting vibration signal.In addition,the proportion of noise energy was the lowest,at 1.8%.

关 键 词：blasting vibration frequency empirical mode decomposition modal aliasing DE-NOISING 

分 类 号：TU751.9[建筑科学—建筑技术科学]