Abstract: The characteristic of the concentration wave in the RTD of out-circular reactor,which is a nonstationary quasi-periodic signal,has been investigated with wavelet analysis.At first,the characteristic scale of concentration wave was determined with an energy maxima criterion based on wavelet analysis.And we found that the characteristic scale of concentration wave is about directly proportional to the average once through time of the reactor.Then,a reconstruction formula based on wavelet analysis is strictly proved to be capable of reconstructing the concentration wave shape.At last,the local singularity exponents of concentration wave crests are calculated with wavelet analysis.The results show that the local singularity exponents of crest increase with time,and runs to about 2 0,which agree very well with theoretical result.

摘要： 应用小波分析研究了外循环反应器浓度波这类非平稳拟周期信号的特征 .首先利用能量最大准则确定浓度波的特征尺度 .其次利用浓度波的特征尺度 ,重构了浓度波的波形 .最后利用小波分析计算了浓度波波峰处的局部奇异性指数