含复杂噪声的发射流场冲击波测量数据分析

Analysis of Shock Wave Test Data in Launching Exhaust Field with Complicated Noise

利用小波分析技术对火箭导弹发射时产生冲击波的强度进行了分析。针对测试数据中所含有复杂的射流噪声 ,定义了基于小波系数的小波频带能量谱和冲击波的强度指数。通过对冲击波压力 -时间历程数据的小波分解和小波频带能量谱的分析 ,确定了冲击波能量所集中的频带 。

The intensity of shock wave in launching exhaust field of rocket and missile has been analyzed by using of wavelet technology. To deal with the complicated jet noise, wavelet frequency band spectrum and shock wave intensity index is defined on the base of wavelet coefficient. Through the analysis of shock wave pressure time history data with wavelet decomposition and wavelet frequency band spectrum, the frequency band in whch shock wave energy concentrates is determined. The shock wave intensity of different test position is compared with the use of intensity index.