|Table of Contents|

Application of high-precision frequency resolution in vibration signal identification(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2017年02期
Page:
66-71
Research Field:
研究与设计
Publishing date:

Info

Title:
Application of high-precision frequency resolution in vibration signal identification
Author(s):
ZHANG Zhaolei1;  SUN Xiaowei1;  XIA Dexin1;  LI Fang2
1. Beijing Aerospace Propulsion Institute, Beijing 100076, China; 2. Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China
Keywords:
anti-aliasing low-pass filtering; frequency resolution; signal extraction; short-time Fourier transform
PACS:
V434-34
DOI:
-
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.

References:

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