基于小波消噪的进气道动压信号的分析

结合进气道隐身装置与某涡扇发动机地面联合试验所采集到的数据,研究了在小波消噪基础上对发动机进气道动态压力信号进行定量处理和分析的方法和步骤。结果表明,信号的频谱分量主要集中在100Hz以下。低发动机转速时,进气道气流形成的涡旋较大。随着转速的提高,压力升高,紊流度增大。证明了在高速紊流的脉动压力系统中存在奇怪吸引子,关联维数为5～6。 

Dynamic Pressure Signal's Processing and Analyzing in Flow Field Based on Wavelet Theory

Combined with the acquisition data from experiments of stealthy device in air duct and some turbofan engine,the paper studies the methods and steps of processing and analyzing dynamic pressure signals based on the wavelet theory.The results show that the power spectrum magnitude of signals is mainly fastened within 100 Hz,both range and turbulence of signals are augmented while rotating speed of engine is raised.The lower is the rotating speed,the more intensive are the vortices.It is confirmed that there is a strange attractor in turbulent fluctuation pressure system of flow field,and the correlation dimension D tends from 5 to 6.