TVAR Time-frequency Analysis for Non-stationary Vibration Signals of Spacecraft
文献类型：期刊论文
| 作者 | Hai Yang1; Wei Cheng1; Hong Zhu2 |
| 刊名 | CHINESE JOURNAL OF AERONAUTICS
 |
| 出版日期 | 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 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/145024]  |
| 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. |
入库方式： OAI收割
来源：金属研究所
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