火箭推进2017，Vol.43Issue(2)：66-71,6.
高精度频率分辨在振动信号辨识中的应用
Application of high-precision frequency resolution in vibration signal identification
张召磊 1孙晓伟 1夏德新 1李芳2
作者信息
- 1. 北京航天动力研究所,北京100076
- 2. 北京宇航系统工程研究所,北京100076
- 折叠
摘要
Abstract
DASP software is usually adopted to conduct vibration signal processing of rocket engine.Due to the limitation of the software function,the highest accuracy of spectrum frequency resolution is merely 12.2 Hz when the sampling frequency processed by DASP is 50 kHz engine vibration signal,which may cause a difficulty of distinguishing the weak and fault signals.A new signal analysis method that combines anti-aliasing low-passes filtering,signal extraction and short-time Fourier transform is adopted in this paper,which can improve the accuracy of frequency resolution effectively.The highest accuracy of the method can reach up to 1.2 Hz,which achieves the ideal effect of frequency identification.关键词
抗混叠低通滤波/频率分辨率/信号抽取/短时傅里叶变换Key words
anti-aliasing low-pass filtering/frequency resolution/signal extraction/short-time Fourier transform分类
航空航天引用本文复制引用
张召磊,孙晓伟,夏德新,李芳..高精度频率分辨在振动信号辨识中的应用[J].火箭推进,2017,43(2):66-71,6.
