DocumentCode :
3770769
Title :
Nonstationary analysis of vibration signals of diesel engine based on LCS
Author :
Hong-Guang Ma;Jian-Qiang Qin;Xiao-Wei Feng;Hao-Miao Liu
Author_Institution :
Xi´an Research Institute of High Technology, Xi´an 710025, P.R. China
fYear :
2015
Firstpage :
1
Lastpage :
5
Abstract :
The detection of nonstationarity and nonlinear dynamics of nonstationary chaotic time-series is a challenge issue, since the conventional methods are all based on the assumption that the objective time-series is stationary. In this paper, we propose a new method for analyzing the nonstationary chaotic time-series, i.e. the phase space reconstruction is directly done on the nonstationary time-series through Hilbert transform, which retains both the nonstationarity and the nonlinear dynamics of the original time-series. Then, the nonstationarity and the nonlinear dynamics are measured via Lagrangian coherent structures (LCS), and a new algorithm for calculating the maximum finite-time Lyapunov exponent (FTLE) is presented. Simulation tests are conducted on a set of vibration signals of diesel engine. Results indicate that the proposed method can provide new features to efficiently identify the nonstationarity and the nonlinear dynamics of nonstationary chaotic time-series.
Keywords :
"Vibrations","Nonlinear dynamical systems","Trajectory","Diesel engines","Valves","Transforms","Chaos"
Publisher :
ieee
Conference_Titel :
Information, Communications and Signal Processing (ICICS), 2015 10th International Conference on
Type :
conf
DOI :
10.1109/ICICS.2015.7459892
Filename :
7459892
Link To Document :
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