Abstract:In order to solve the problem of low identification accuracy caused by modal aliasing in the delay identification process of blasting signal in EMD method. A completely orthogonal empirical mode decomposition method is proposed. Firstly, the original signal is decomposed by EMD to obtain several IMF components with modal aliasing. Secondly, the IMF components are analyzed by principal component analysis. The IMF components are completely orthogonalized, and the main IMF components with large amplitude and obvious waveform attenuation are selected. The envelope is extracted by Hilbert transform. Finally, the peak points of the envelope are identified. Through the similar physical simulation experiment, it is proved that compared with the traditional EMD method, principal empirical mode decomposition (PEMD) can effectively suppress the modal aliasing when EMD decomposition of vibration signal, reduce the delay identification error to 0ms, and test the stability of PEMD method by controlling the elevation and delay time variables. At the same time, taking the delay blasting experiment of open-pit slope as an example, PEMD can identify the peak value of blasting vibration better, and the recognition rate is more than 90%. It is of great significance to the optimization of blasting parameters and the identification of blind gun in subsequent blasting engineering.
易文华,刘连生,闫雷,董斌斌,刘伟,杨 砚. 基于经验模态分解的爆破延期识别优化方法[J]. 振动与冲击, 2022, 41(2): 217-223.
YI Wenhua,LIU Liansheng,YAN Lei,DONG Binbin,LIU Wei,YANG Yan. An optimization method for the identification of blasting delay based on empirical mode decomposition. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(2): 217-223.
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