基于修正傅立叶级数展开的非稳态振动信号分析  

Non-Stationary Vibration Analysis Based on Modified Fourier Series Expansion

作　　者：张武林[1] 高文涛[1] ZHANG Wulin;GAO Wentao(Aircraft Flight Test Technology Institute,China Flight Test Establishment,Xi’an 710089,China)

机构地区：[1]中国飞行试验研究院飞机所,陕西西安710089

出　　处：《测试技术学报》2019年第1期19-23,共5页Journal of Test and Measurement Technology

摘　　要：直升机在做机动飞行时,振动信号具有非平稳特性,传统傅立叶变换无法得到这一变化趋势.为了对非稳态信号进行分析,本文基于修正的傅立叶级数展开法对飞行试验中的非稳态信号进行分析,结果显示:采用该方法能够准确给出非稳态信号的振动变化信息.另外,该方法计算量小,具有很好的实时性,可以应用于振动实时监控,以降低试飞风险,保障试飞安全.The vibration signal of the helicopter is non-stationary during maneuvering flight,and the traditional Fourier transform cannot get the change trend.The transient signal of flight test is analyzed based on modified Fourier series expansion method in this paper.The results show that by this method using the changes of non-stationary vibration signal are captured accurately.In addition,since this method has a small amount of calculation,it has a good real-time performance and can be applied in real-time vibration monitoring to reduce the risk and ensure the safety of flight test.

关 键 词：振动分析 傅立叶级数展开 非平稳特性 振动监控 

分 类 号：V217.1[航空宇航科学与技术—航空宇航推进理论与工程]