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利用小波包对信号进行分解 ,分解的层数越多 ,频域分辨率越高 ,但时域分辨率越低 ,对故障信号的精确诊断不利。为提高时域分辨率 ,本文采用小波包重构算法 ,对发动机气缸振动信号的特定频段进行了小波包重构 ,并由此判断汽车发动机气缸燃烧振动的具体状态。
Using wavelet packets to decompose the signal, the more decomposition layers, the higher the frequency domain resolution, but the lower the temporal resolution, which is unfavorable to the accurate diagnosis of the fault signal. In order to improve the resolution in time domain, wavelet package reconstruction algorithm is used in this paper to reconstruct the specific frequency band of engine cylinder vibration signal and to judge the specific state of combustion vibration of automobile engine cylinder.