TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft

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	TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft
	Hai Yang 1; Wei Cheng 1; Hong Zhu 2
刊名	CHINESE JOURNAL OF AERONAUTICS
	2008
卷号	21 期号:5 页码:423-432
关键词	non-stationary random vibration time-frequency distribution process neural network empirical mode decomposition
ISSN号	1000-9361
其他题名	TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft
英文摘要	Predicting the time-varying auto-spectral density of a spacecraft in high-altitude orbits requires an accurate model for the non-stationary random vibration signals with densely spaced modal frequency. The traditional time-varying algorithm limits prediction accuracy, thus affecting a number of operational decisions. To solve this problem, a time-varying auto regressive (TVAR) model based on the process neural network (PNN) and the empirical mode decomposition (EMD) is proposed. The time-varying system is tracked on-line by establishing a time-varying parameter model, and then the relevant parameter spectrum is obtained. Firstly, the EMD method is utilized to decompose the signal into several intrinsic mode functions (IMFs). Then for each IMF, the PNN is established and the time-varying auto-spectral density is obtained. Finally, the time-frequency distribution of the signals can be reconstructed by linear superposition. The simulation and the analytical results from an example demonstrate that this approach possesses simplicity, effectiveness, and feasibility, as well as higher frequency resolution.
语种	英语
CSCD记录号	CSCD:3388996
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/145027]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Beijing Univ Aeronaut & Astronaut, Institute Solid Mech, Beijing 100191, Peoples R China 2.中国科学院金属研究所
推荐引用方式 GB/T 7714	Hai Yang,Wei Cheng,Hong Zhu. TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft[J]. CHINESE JOURNAL OF AERONAUTICS,2008,21(5):423-432.
APA	Hai Yang,Wei Cheng,&Hong Zhu.(2008).TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft.CHINESE JOURNAL OF AERONAUTICS,21(5),423-432.
MLA	Hai Yang,et al."TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft".CHINESE JOURNAL OF AERONAUTICS 21.5(2008):423-432.