北京航空航天大学学报 ›› 2006, Vol. 32 ›› Issue (07): 760-763.

• 论文 • 上一篇    下一篇

飞行器助推段振动环境分析

袁宏杰, 唐环, 姜同敏   

  1. 北京航空航天大学 工程系统工程系, 北京 100083
  • 收稿日期:2005-08-01 出版日期:2006-07-31 发布日期:2010-09-19
  • 作者简介:袁宏杰(1970-),男,河北阜城人,高级工程师,yuanhongjie@buaa.edu.cn.

Analysis of nonstationary random vibration data during lift-off

Yuan Hongjie, Tang Huan, Jiang Tongmin   

  1. Dept. of System Engineering of Engineering Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2005-08-01 Online:2006-07-31 Published:2010-09-19

摘要: 对飞行器助推段非平稳随机振动信号采用局部平稳模型进行分析,把此段非平稳随机信号的时变谱分解成2个独立的过程:决定时变均方值的确定性过程和决定频率特性的平稳随机过程.利用小波分析对确定性信号和随机信号进行分离,用信号的全部带宽计算非平稳信号的时变均方值,缩短了平均时间,减少了偏置误差;用信号的整个持续时间确定非平稳信号的谱特性,提高了频率分辨率,减少了随机误差.对分离出的平稳随机振动自功率谱密度进行了归纳,得到了飞行器助推段的振动环境.

Abstract: The locally stationary parametric model was established to analyze the nonstationary random vibration environment of aircraft during lift-off. The computation of a time-varying spectrum was decomposed into two separate operations, one to define the time-varying mean square value of the signal, and the other to define the spectral properties of the signal. The wavelet transforms were used to separate the nonstationary vibration signal into the deterministic signal and random signal. Specifically, the time-varying mean square value of the signal was computed using the entire signal bandwidth,and the averaging time could be made short without causing a large bias error. Conversely, the basic spectra character of the signal was computed using the entire signal duration, and the frequency resolution bandwidth could be made small without causing a large random error. The vibration environment of aircraft during lift-off was obtained by concluding the auto-spectra of stationary random vibration.

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