一种基于频率变化线的飞机振源分析方法  

A method for aircraft vibration source analysis based on frequency variation line

作　　者：苏越[1] 王东森[1] 

机构地区：[1]中国飞行试验研究院飞机所,陕西西安710089

出　　处：《中国科技信息》2013年第23期180-183,共4页China Science and Technology Information

摘　　要：对于飞行试验中非平稳振动信号,进行时频分析后仅可定性的观察到频率值随时间发生变化的趋势,为了确定振源机理,需要进一步寻求频率变化与飞行参数变化之间的相关性。提出了一种把所关注频率值的变化曲线从时频分析图中提取出来的方法,以定量的研究引起频率值变化的原因。针对某型机平飞状态出现的垂尾尖部振动较大现象,运用此方法提取频率变化线,通过与发动机参数的对比与拟合,确认了该振动产生的振源来自发动机的高压转子。The Time-Frequency analysis for non-stationary vibration signals can only give the qualitative trend of the frequency change with time. In order to determine the mechanism of vibration source, the correlation between the frequency value and flight parameters is often in need. In this paper, a method to extraction the curve of the frequency value is put forward so that the reason why the frequency value changes can be analyzed. During a flight test of some type plane, the vibration of the vertical fin is high. This method is applied to this case and by fitting the frequency values with the engine parameters, the source of this vibration is determined to be high pressure rotor of engine.

关 键 词：频率变化线 振动 飞行试验 振源 时频分析 

分 类 号：V217[航空宇航科学与技术—航空宇航推进理论与工程]