基于小波包与分形组合技术在变压力下液压管路振动信号分析研究

Application of wavelet packet and fractal combination technology in analyzing aero-engine hydraulic pipeline vibration signals with variable pressure

提出基于小波包与分形组合技术对压力突变情况下航空发动机液压管路振动信号进行分析。首先,采用小波包对压力突变下液压管路振动信号进行分解,压力突变下液压管路振动信号的分形特征通过小波包的重构系数得到反映与验证;其次,通过对比分析小波包的关联维数值,得到压力突变下液压管路振动信号不同频带与关联维数的变化规律;最后结果表明,基于小波包与分形组合技术可以反映压力突变下液压管路振动信号特征。

We present a wavelet packet and fractal technology to analyze the aero-engine hydraulic pipeline vibration signals with variable pressure.Firstly,we decompose aero-engine hydraulic pipeline vibration signals using the wavelet packet,and the fractal characteristics of pipeline vibration signals with variable pressure are validated by the reconstruction coefficients of the wavelet packet.Moreover,the fractal dimension changes of different frequency components are verified by analyzing and comparing the correlation dimensions of the main wavelet packets.The combination analysis shows that the wavelet packet and fractal combination technology can reflect fractal features of aero-engine hydraulic pipeline vibration signals under different pressure.