摘要
以飞机不同迎角飞行时压气机中的脉动压力为研究对象,运用短时傅立叶变换的信号处理的方法将高采样率的数据转化到时频域进行分析,利用无量纲化的特征值对压气机的稳定性进行定量的评估,同时可对其不稳定性的趋势给予判断。旨在阐述了一种基于脉动压力的气动稳定性分析方法,在飞行试验中,可用此方法判断压气机的稳定性以及不稳定趋势,为飞行安全提供一定的保障。
In this paper, taking the pulsating pressure in the air compressor at different angles of attack as the research object, the data with high sampling rate is transformed to the time-frequency domain with the short-time Fourier transform signal processing method for analysis. The stability of the compressor is evaluated quantitatively by using the dimensionless characteristic value;at the same time, the tendency of its instability is judged. This paper presents an aerodynamic stability analysis method based on pulsating pressure. In flight tests, the method can be used to determine the stability and instability trend of the compressor, which can provide certain guarantee for the flight safety.
作者
田琳
高莎莎
申世才
TIAN Lin;GAO Sha-sha;SHEN Shi-cai(Chinese Flight Test Establishment, Xi'an Shaanxi 710089, China)
出处
《机械研究与应用》
2019年第1期65-67,共3页
Mechanical Research & Application
关键词
脉动压力
短时傅立叶变换
特征值
气动稳定性
飞行安全
pulsating pressure
short-time Fourier transform
characteristic value
aerodynamic stability
flight safety
