In order to truly obtain the feature extraction of vibration signals under the strong background noise, the analysis and improvement of empirical mode decomposition （EMD） is carried on. After that, the improved EMD ...In order to truly obtain the feature extraction of vibration signals under the strong background noise, the analysis and improvement of empirical mode decomposition （EMD） is carried on. After that, the improved EMD is applied to the feature extraction of vehicle vibration signals. First, the multi-autocorrelation method is adopted in each input signal,so the noise is reduced effectively. Then, EMD is used to deal with these signals,and the intrinsic mode functions （IMFs） are obtained. Finally, for obtaining the feature information of these signals, the Hilbert transformation and the spectrum analysis are performed in some IMFs. Theoretical analysis and ex- periment verify the effectiveness of the method, which are valuable reference for the same engineering problems.展开更多
TN65 2000021491时间积分声光相关器相关峰提取技术的实验研究=Experimental research of correlation peak extractiontechnique of time-integrating acousto-optic correlator[刊,中]/邵定蓉,刘波,张波(北京航空航天大学电子工程系....TN65 2000021491时间积分声光相关器相关峰提取技术的实验研究=Experimental research of correlation peak extractiontechnique of time-integrating acousto-optic correlator[刊,中]/邵定蓉,刘波,张波(北京航空航天大学电子工程系.北京(100083))//电子学报.-1999,27(3).-19-21根据声光相关原理,针对时间积分声光相关器的相关峰提取问题,提出了系统实施方案,建立了实验系统的数学模型,设计和制作了系统的光路和电路。展开更多
基金Supported by the Scientific Research Foundation for the Imported Talents(YKJ201014)~~
文摘In order to truly obtain the feature extraction of vibration signals under the strong background noise, the analysis and improvement of empirical mode decomposition （EMD） is carried on. After that, the improved EMD is applied to the feature extraction of vehicle vibration signals. First, the multi-autocorrelation method is adopted in each input signal,so the noise is reduced effectively. Then, EMD is used to deal with these signals,and the intrinsic mode functions （IMFs） are obtained. Finally, for obtaining the feature information of these signals, the Hilbert transformation and the spectrum analysis are performed in some IMFs. Theoretical analysis and ex- periment verify the effectiveness of the method, which are valuable reference for the same engineering problems.
文摘TN65 2000021491时间积分声光相关器相关峰提取技术的实验研究=Experimental research of correlation peak extractiontechnique of time-integrating acousto-optic correlator[刊,中]/邵定蓉,刘波,张波(北京航空航天大学电子工程系.北京(100083))//电子学报.-1999,27(3).-19-21根据声光相关原理,针对时间积分声光相关器的相关峰提取问题,提出了系统实施方案,建立了实验系统的数学模型,设计和制作了系统的光路和电路。
