NDLI: The application of energy operator demodulation approach based on EMD in mechanical system identification

Content Provider	IEEE Xplore Digital Library
Author	Jie Guo Shaoqian Qin Chang'an Zhu
Copyright Year	2012
Description	Author affiliation: Department of Precision Machinery and Precision Instruments, University of Science and Technology of China, Hefei, China (Jie Guo; Shaoqian Qin; Chang'an Zhu)
Abstract	The dynamic properties, such as the natural frequencies and damping ratios, of ultra-precise positioning systems are needed for accurately predicting the response to external excitations and achieving high precision. This paper proposes the energy operator demodulation approach based on the empirical mode decomposition (EMD) method for realizing parametric identification, which has high identification precision and low calculation. Firstly, the EMD method is used to decompose measured impulse response of a MDOF structure into a number of modal responses. Then the energy operator demodulation approach is applied to each modal response to calculate the instantaneous amplitudes and instantaneous frequencies. Finally, the linear least-square fit procedure is performed to accurately estimate the system parameters, such as the natural frequencies and damping ratios. The theoretical analysis and simulation results demonstrate that the energy operator demodulation approach based on EMD can be successfully applied to system identification.
Starting Page	80
Ending Page	85
File Size	644850
Page Count	6
File Format	PDF
ISBN	9781467316439
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-11-28
Publisher Place	New Zealand
Access Restriction	Subscribed
Rights Holder	AUT University
Subject Keyword	Damping Time-frequency analysis energy operator Hilbert transform empirical mode decomposition Simulation Noise Transforms System identification system identification Demodulation
Content Type	Text
Resource Type	Article

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