飞行实测应力分析中的一种频谱分析方法  

A Method of Spectrum Analysis for Real Flight Strain Test Data

作　　者：万振华 李永寿[3] 李坚 刘星 WAN Zhen-hua;LI Yong-shou;LI Jian;LIU Xing(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou Hunan 412002;National Key Laboratory of Science and Technology on Helicopter Transmission,Zhuzhou Hunan 412002;Chinese Flight Test Establishment,Xi’an Shaanxi 710089)

机构地区：[1]中国航发湖南航空动力机械研究所,湖南株洲412002 [2]直升机传动技术国防科技重点实验室,湖南株洲412002 [3]中国飞行试验研究院,陕西西安710089

出　　处：《长沙航空职业技术学院学报》2021年第4期1-5,共5页Journal of Changsha Aeronautical Vocational and Technical College

摘　　要：直升机飞行载荷数据是一种典型的随机信号,对该信号进行频谱分析可以获得信号频谱的组成,摸清信号与系统的特征,有利于判断载荷来源。本文采用傅立叶变换对直升机试飞应力数据进行频谱分析,通过比较两种尾桨安装结构下旋翼5Ω和尾桨2Ω的应变变化情况,有效地辨别出某型直升机尾减机匣飞行实测应力增大的原因。The helicopter flight load data is a typical random signal.A spectrum analysis of this random signal can obtain the composition of signal spectrum and find out the characteristics of signals and systems,which is helpful to judge the source of load.Fourier transform was used to analyze the frequency spectrum of helicopter flight strain test data.By comparing the strain changes of the rotor5Ωand tail rotor2Ωunder the two tail rotor installation structures,the reason for the increase of real flight strain test data of a helicopter’s TGB is effectively identified.

关 键 词：载荷数据 傅立叶变换 频谱分析 载荷来源 

分 类 号：V212.4[航空宇航科学与技术—航空宇航推进理论与工程]